synclink_gt.c revision 89c8d91e31f267703e365593f6bfebb9f6d2ad01
1/* 2 * Device driver for Microgate SyncLink GT serial adapters. 3 * 4 * written by Paul Fulghum for Microgate Corporation 5 * paulkf@microgate.com 6 * 7 * Microgate and SyncLink are trademarks of Microgate Corporation 8 * 9 * This code is released under the GNU General Public License (GPL) 10 * 11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 21 * OF THE POSSIBILITY OF SUCH DAMAGE. 22 */ 23 24/* 25 * DEBUG OUTPUT DEFINITIONS 26 * 27 * uncomment lines below to enable specific types of debug output 28 * 29 * DBGINFO information - most verbose output 30 * DBGERR serious errors 31 * DBGBH bottom half service routine debugging 32 * DBGISR interrupt service routine debugging 33 * DBGDATA output receive and transmit data 34 * DBGTBUF output transmit DMA buffers and registers 35 * DBGRBUF output receive DMA buffers and registers 36 */ 37 38#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt 39#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt 40#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt 41#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt 42#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label)) 43/*#define DBGTBUF(info) dump_tbufs(info)*/ 44/*#define DBGRBUF(info) dump_rbufs(info)*/ 45 46 47#include <linux/module.h> 48#include <linux/errno.h> 49#include <linux/signal.h> 50#include <linux/sched.h> 51#include <linux/timer.h> 52#include <linux/interrupt.h> 53#include <linux/pci.h> 54#include <linux/tty.h> 55#include <linux/tty_flip.h> 56#include <linux/serial.h> 57#include <linux/major.h> 58#include <linux/string.h> 59#include <linux/fcntl.h> 60#include <linux/ptrace.h> 61#include <linux/ioport.h> 62#include <linux/mm.h> 63#include <linux/seq_file.h> 64#include <linux/slab.h> 65#include <linux/netdevice.h> 66#include <linux/vmalloc.h> 67#include <linux/init.h> 68#include <linux/delay.h> 69#include <linux/ioctl.h> 70#include <linux/termios.h> 71#include <linux/bitops.h> 72#include <linux/workqueue.h> 73#include <linux/hdlc.h> 74#include <linux/synclink.h> 75 76#include <asm/io.h> 77#include <asm/irq.h> 78#include <asm/dma.h> 79#include <asm/types.h> 80#include <asm/uaccess.h> 81 82#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE)) 83#define SYNCLINK_GENERIC_HDLC 1 84#else 85#define SYNCLINK_GENERIC_HDLC 0 86#endif 87 88/* 89 * module identification 90 */ 91static char *driver_name = "SyncLink GT"; 92static char *tty_driver_name = "synclink_gt"; 93static char *tty_dev_prefix = "ttySLG"; 94MODULE_LICENSE("GPL"); 95#define MGSL_MAGIC 0x5401 96#define MAX_DEVICES 32 97 98static struct pci_device_id pci_table[] = { 99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 103 {0,}, /* terminate list */ 104}; 105MODULE_DEVICE_TABLE(pci, pci_table); 106 107static int init_one(struct pci_dev *dev,const struct pci_device_id *ent); 108static void remove_one(struct pci_dev *dev); 109static struct pci_driver pci_driver = { 110 .name = "synclink_gt", 111 .id_table = pci_table, 112 .probe = init_one, 113 .remove = __devexit_p(remove_one), 114}; 115 116static bool pci_registered; 117 118/* 119 * module configuration and status 120 */ 121static struct slgt_info *slgt_device_list; 122static int slgt_device_count; 123 124static int ttymajor; 125static int debug_level; 126static int maxframe[MAX_DEVICES]; 127 128module_param(ttymajor, int, 0); 129module_param(debug_level, int, 0); 130module_param_array(maxframe, int, NULL, 0); 131 132MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned"); 133MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail"); 134MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)"); 135 136/* 137 * tty support and callbacks 138 */ 139static struct tty_driver *serial_driver; 140 141static int open(struct tty_struct *tty, struct file * filp); 142static void close(struct tty_struct *tty, struct file * filp); 143static void hangup(struct tty_struct *tty); 144static void set_termios(struct tty_struct *tty, struct ktermios *old_termios); 145 146static int write(struct tty_struct *tty, const unsigned char *buf, int count); 147static int put_char(struct tty_struct *tty, unsigned char ch); 148static void send_xchar(struct tty_struct *tty, char ch); 149static void wait_until_sent(struct tty_struct *tty, int timeout); 150static int write_room(struct tty_struct *tty); 151static void flush_chars(struct tty_struct *tty); 152static void flush_buffer(struct tty_struct *tty); 153static void tx_hold(struct tty_struct *tty); 154static void tx_release(struct tty_struct *tty); 155 156static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg); 157static int chars_in_buffer(struct tty_struct *tty); 158static void throttle(struct tty_struct * tty); 159static void unthrottle(struct tty_struct * tty); 160static int set_break(struct tty_struct *tty, int break_state); 161 162/* 163 * generic HDLC support and callbacks 164 */ 165#if SYNCLINK_GENERIC_HDLC 166#define dev_to_port(D) (dev_to_hdlc(D)->priv) 167static void hdlcdev_tx_done(struct slgt_info *info); 168static void hdlcdev_rx(struct slgt_info *info, char *buf, int size); 169static int hdlcdev_init(struct slgt_info *info); 170static void hdlcdev_exit(struct slgt_info *info); 171#endif 172 173 174/* 175 * device specific structures, macros and functions 176 */ 177 178#define SLGT_MAX_PORTS 4 179#define SLGT_REG_SIZE 256 180 181/* 182 * conditional wait facility 183 */ 184struct cond_wait { 185 struct cond_wait *next; 186 wait_queue_head_t q; 187 wait_queue_t wait; 188 unsigned int data; 189}; 190static void init_cond_wait(struct cond_wait *w, unsigned int data); 191static void add_cond_wait(struct cond_wait **head, struct cond_wait *w); 192static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w); 193static void flush_cond_wait(struct cond_wait **head); 194 195/* 196 * DMA buffer descriptor and access macros 197 */ 198struct slgt_desc 199{ 200 __le16 count; 201 __le16 status; 202 __le32 pbuf; /* physical address of data buffer */ 203 __le32 next; /* physical address of next descriptor */ 204 205 /* driver book keeping */ 206 char *buf; /* virtual address of data buffer */ 207 unsigned int pdesc; /* physical address of this descriptor */ 208 dma_addr_t buf_dma_addr; 209 unsigned short buf_count; 210}; 211 212#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b)) 213#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b)) 214#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b)) 215#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0)) 216#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b)) 217#define desc_count(a) (le16_to_cpu((a).count)) 218#define desc_status(a) (le16_to_cpu((a).status)) 219#define desc_complete(a) (le16_to_cpu((a).status) & BIT15) 220#define desc_eof(a) (le16_to_cpu((a).status) & BIT2) 221#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1) 222#define desc_abort(a) (le16_to_cpu((a).status) & BIT0) 223#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3) 224 225struct _input_signal_events { 226 int ri_up; 227 int ri_down; 228 int dsr_up; 229 int dsr_down; 230 int dcd_up; 231 int dcd_down; 232 int cts_up; 233 int cts_down; 234}; 235 236/* 237 * device instance data structure 238 */ 239struct slgt_info { 240 void *if_ptr; /* General purpose pointer (used by SPPP) */ 241 struct tty_port port; 242 243 struct slgt_info *next_device; /* device list link */ 244 245 int magic; 246 247 char device_name[25]; 248 struct pci_dev *pdev; 249 250 int port_count; /* count of ports on adapter */ 251 int adapter_num; /* adapter instance number */ 252 int port_num; /* port instance number */ 253 254 /* array of pointers to port contexts on this adapter */ 255 struct slgt_info *port_array[SLGT_MAX_PORTS]; 256 257 int line; /* tty line instance number */ 258 259 struct mgsl_icount icount; 260 261 int timeout; 262 int x_char; /* xon/xoff character */ 263 unsigned int read_status_mask; 264 unsigned int ignore_status_mask; 265 266 wait_queue_head_t status_event_wait_q; 267 wait_queue_head_t event_wait_q; 268 struct timer_list tx_timer; 269 struct timer_list rx_timer; 270 271 unsigned int gpio_present; 272 struct cond_wait *gpio_wait_q; 273 274 spinlock_t lock; /* spinlock for synchronizing with ISR */ 275 276 struct work_struct task; 277 u32 pending_bh; 278 bool bh_requested; 279 bool bh_running; 280 281 int isr_overflow; 282 bool irq_requested; /* true if IRQ requested */ 283 bool irq_occurred; /* for diagnostics use */ 284 285 /* device configuration */ 286 287 unsigned int bus_type; 288 unsigned int irq_level; 289 unsigned long irq_flags; 290 291 unsigned char __iomem * reg_addr; /* memory mapped registers address */ 292 u32 phys_reg_addr; 293 bool reg_addr_requested; 294 295 MGSL_PARAMS params; /* communications parameters */ 296 u32 idle_mode; 297 u32 max_frame_size; /* as set by device config */ 298 299 unsigned int rbuf_fill_level; 300 unsigned int rx_pio; 301 unsigned int if_mode; 302 unsigned int base_clock; 303 unsigned int xsync; 304 unsigned int xctrl; 305 306 /* device status */ 307 308 bool rx_enabled; 309 bool rx_restart; 310 311 bool tx_enabled; 312 bool tx_active; 313 314 unsigned char signals; /* serial signal states */ 315 int init_error; /* initialization error */ 316 317 unsigned char *tx_buf; 318 int tx_count; 319 320 char flag_buf[MAX_ASYNC_BUFFER_SIZE]; 321 char char_buf[MAX_ASYNC_BUFFER_SIZE]; 322 bool drop_rts_on_tx_done; 323 struct _input_signal_events input_signal_events; 324 325 int dcd_chkcount; /* check counts to prevent */ 326 int cts_chkcount; /* too many IRQs if a signal */ 327 int dsr_chkcount; /* is floating */ 328 int ri_chkcount; 329 330 char *bufs; /* virtual address of DMA buffer lists */ 331 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */ 332 333 unsigned int rbuf_count; 334 struct slgt_desc *rbufs; 335 unsigned int rbuf_current; 336 unsigned int rbuf_index; 337 unsigned int rbuf_fill_index; 338 unsigned short rbuf_fill_count; 339 340 unsigned int tbuf_count; 341 struct slgt_desc *tbufs; 342 unsigned int tbuf_current; 343 unsigned int tbuf_start; 344 345 unsigned char *tmp_rbuf; 346 unsigned int tmp_rbuf_count; 347 348 /* SPPP/Cisco HDLC device parts */ 349 350 int netcount; 351 spinlock_t netlock; 352#if SYNCLINK_GENERIC_HDLC 353 struct net_device *netdev; 354#endif 355 356}; 357 358static MGSL_PARAMS default_params = { 359 .mode = MGSL_MODE_HDLC, 360 .loopback = 0, 361 .flags = HDLC_FLAG_UNDERRUN_ABORT15, 362 .encoding = HDLC_ENCODING_NRZI_SPACE, 363 .clock_speed = 0, 364 .addr_filter = 0xff, 365 .crc_type = HDLC_CRC_16_CCITT, 366 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS, 367 .preamble = HDLC_PREAMBLE_PATTERN_NONE, 368 .data_rate = 9600, 369 .data_bits = 8, 370 .stop_bits = 1, 371 .parity = ASYNC_PARITY_NONE 372}; 373 374 375#define BH_RECEIVE 1 376#define BH_TRANSMIT 2 377#define BH_STATUS 4 378#define IO_PIN_SHUTDOWN_LIMIT 100 379 380#define DMABUFSIZE 256 381#define DESC_LIST_SIZE 4096 382 383#define MASK_PARITY BIT1 384#define MASK_FRAMING BIT0 385#define MASK_BREAK BIT14 386#define MASK_OVERRUN BIT4 387 388#define GSR 0x00 /* global status */ 389#define JCR 0x04 /* JTAG control */ 390#define IODR 0x08 /* GPIO direction */ 391#define IOER 0x0c /* GPIO interrupt enable */ 392#define IOVR 0x10 /* GPIO value */ 393#define IOSR 0x14 /* GPIO interrupt status */ 394#define TDR 0x80 /* tx data */ 395#define RDR 0x80 /* rx data */ 396#define TCR 0x82 /* tx control */ 397#define TIR 0x84 /* tx idle */ 398#define TPR 0x85 /* tx preamble */ 399#define RCR 0x86 /* rx control */ 400#define VCR 0x88 /* V.24 control */ 401#define CCR 0x89 /* clock control */ 402#define BDR 0x8a /* baud divisor */ 403#define SCR 0x8c /* serial control */ 404#define SSR 0x8e /* serial status */ 405#define RDCSR 0x90 /* rx DMA control/status */ 406#define TDCSR 0x94 /* tx DMA control/status */ 407#define RDDAR 0x98 /* rx DMA descriptor address */ 408#define TDDAR 0x9c /* tx DMA descriptor address */ 409#define XSR 0x40 /* extended sync pattern */ 410#define XCR 0x44 /* extended control */ 411 412#define RXIDLE BIT14 413#define RXBREAK BIT14 414#define IRQ_TXDATA BIT13 415#define IRQ_TXIDLE BIT12 416#define IRQ_TXUNDER BIT11 /* HDLC */ 417#define IRQ_RXDATA BIT10 418#define IRQ_RXIDLE BIT9 /* HDLC */ 419#define IRQ_RXBREAK BIT9 /* async */ 420#define IRQ_RXOVER BIT8 421#define IRQ_DSR BIT7 422#define IRQ_CTS BIT6 423#define IRQ_DCD BIT5 424#define IRQ_RI BIT4 425#define IRQ_ALL 0x3ff0 426#define IRQ_MASTER BIT0 427 428#define slgt_irq_on(info, mask) \ 429 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask))) 430#define slgt_irq_off(info, mask) \ 431 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask))) 432 433static __u8 rd_reg8(struct slgt_info *info, unsigned int addr); 434static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value); 435static __u16 rd_reg16(struct slgt_info *info, unsigned int addr); 436static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value); 437static __u32 rd_reg32(struct slgt_info *info, unsigned int addr); 438static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value); 439 440static void msc_set_vcr(struct slgt_info *info); 441 442static int startup(struct slgt_info *info); 443static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info); 444static void shutdown(struct slgt_info *info); 445static void program_hw(struct slgt_info *info); 446static void change_params(struct slgt_info *info); 447 448static int register_test(struct slgt_info *info); 449static int irq_test(struct slgt_info *info); 450static int loopback_test(struct slgt_info *info); 451static int adapter_test(struct slgt_info *info); 452 453static void reset_adapter(struct slgt_info *info); 454static void reset_port(struct slgt_info *info); 455static void async_mode(struct slgt_info *info); 456static void sync_mode(struct slgt_info *info); 457 458static void rx_stop(struct slgt_info *info); 459static void rx_start(struct slgt_info *info); 460static void reset_rbufs(struct slgt_info *info); 461static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last); 462static void rdma_reset(struct slgt_info *info); 463static bool rx_get_frame(struct slgt_info *info); 464static bool rx_get_buf(struct slgt_info *info); 465 466static void tx_start(struct slgt_info *info); 467static void tx_stop(struct slgt_info *info); 468static void tx_set_idle(struct slgt_info *info); 469static unsigned int free_tbuf_count(struct slgt_info *info); 470static unsigned int tbuf_bytes(struct slgt_info *info); 471static void reset_tbufs(struct slgt_info *info); 472static void tdma_reset(struct slgt_info *info); 473static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count); 474 475static void get_signals(struct slgt_info *info); 476static void set_signals(struct slgt_info *info); 477static void enable_loopback(struct slgt_info *info); 478static void set_rate(struct slgt_info *info, u32 data_rate); 479 480static int bh_action(struct slgt_info *info); 481static void bh_handler(struct work_struct *work); 482static void bh_transmit(struct slgt_info *info); 483static void isr_serial(struct slgt_info *info); 484static void isr_rdma(struct slgt_info *info); 485static void isr_txeom(struct slgt_info *info, unsigned short status); 486static void isr_tdma(struct slgt_info *info); 487 488static int alloc_dma_bufs(struct slgt_info *info); 489static void free_dma_bufs(struct slgt_info *info); 490static int alloc_desc(struct slgt_info *info); 491static void free_desc(struct slgt_info *info); 492static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count); 493static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count); 494 495static int alloc_tmp_rbuf(struct slgt_info *info); 496static void free_tmp_rbuf(struct slgt_info *info); 497 498static void tx_timeout(unsigned long context); 499static void rx_timeout(unsigned long context); 500 501/* 502 * ioctl handlers 503 */ 504static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount); 505static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params); 506static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params); 507static int get_txidle(struct slgt_info *info, int __user *idle_mode); 508static int set_txidle(struct slgt_info *info, int idle_mode); 509static int tx_enable(struct slgt_info *info, int enable); 510static int tx_abort(struct slgt_info *info); 511static int rx_enable(struct slgt_info *info, int enable); 512static int modem_input_wait(struct slgt_info *info,int arg); 513static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr); 514static int tiocmget(struct tty_struct *tty); 515static int tiocmset(struct tty_struct *tty, 516 unsigned int set, unsigned int clear); 517static int set_break(struct tty_struct *tty, int break_state); 518static int get_interface(struct slgt_info *info, int __user *if_mode); 519static int set_interface(struct slgt_info *info, int if_mode); 520static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 521static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 522static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); 523static int get_xsync(struct slgt_info *info, int __user *if_mode); 524static int set_xsync(struct slgt_info *info, int if_mode); 525static int get_xctrl(struct slgt_info *info, int __user *if_mode); 526static int set_xctrl(struct slgt_info *info, int if_mode); 527 528/* 529 * driver functions 530 */ 531static void add_device(struct slgt_info *info); 532static void device_init(int adapter_num, struct pci_dev *pdev); 533static int claim_resources(struct slgt_info *info); 534static void release_resources(struct slgt_info *info); 535 536/* 537 * DEBUG OUTPUT CODE 538 */ 539#ifndef DBGINFO 540#define DBGINFO(fmt) 541#endif 542#ifndef DBGERR 543#define DBGERR(fmt) 544#endif 545#ifndef DBGBH 546#define DBGBH(fmt) 547#endif 548#ifndef DBGISR 549#define DBGISR(fmt) 550#endif 551 552#ifdef DBGDATA 553static void trace_block(struct slgt_info *info, const char *data, int count, const char *label) 554{ 555 int i; 556 int linecount; 557 printk("%s %s data:\n",info->device_name, label); 558 while(count) { 559 linecount = (count > 16) ? 16 : count; 560 for(i=0; i < linecount; i++) 561 printk("%02X ",(unsigned char)data[i]); 562 for(;i<17;i++) 563 printk(" "); 564 for(i=0;i<linecount;i++) { 565 if (data[i]>=040 && data[i]<=0176) 566 printk("%c",data[i]); 567 else 568 printk("."); 569 } 570 printk("\n"); 571 data += linecount; 572 count -= linecount; 573 } 574} 575#else 576#define DBGDATA(info, buf, size, label) 577#endif 578 579#ifdef DBGTBUF 580static void dump_tbufs(struct slgt_info *info) 581{ 582 int i; 583 printk("tbuf_current=%d\n", info->tbuf_current); 584 for (i=0 ; i < info->tbuf_count ; i++) { 585 printk("%d: count=%04X status=%04X\n", 586 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status)); 587 } 588} 589#else 590#define DBGTBUF(info) 591#endif 592 593#ifdef DBGRBUF 594static void dump_rbufs(struct slgt_info *info) 595{ 596 int i; 597 printk("rbuf_current=%d\n", info->rbuf_current); 598 for (i=0 ; i < info->rbuf_count ; i++) { 599 printk("%d: count=%04X status=%04X\n", 600 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status)); 601 } 602} 603#else 604#define DBGRBUF(info) 605#endif 606 607static inline int sanity_check(struct slgt_info *info, char *devname, const char *name) 608{ 609#ifdef SANITY_CHECK 610 if (!info) { 611 printk("null struct slgt_info for (%s) in %s\n", devname, name); 612 return 1; 613 } 614 if (info->magic != MGSL_MAGIC) { 615 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name); 616 return 1; 617 } 618#else 619 if (!info) 620 return 1; 621#endif 622 return 0; 623} 624 625/** 626 * line discipline callback wrappers 627 * 628 * The wrappers maintain line discipline references 629 * while calling into the line discipline. 630 * 631 * ldisc_receive_buf - pass receive data to line discipline 632 */ 633static void ldisc_receive_buf(struct tty_struct *tty, 634 const __u8 *data, char *flags, int count) 635{ 636 struct tty_ldisc *ld; 637 if (!tty) 638 return; 639 ld = tty_ldisc_ref(tty); 640 if (ld) { 641 if (ld->ops->receive_buf) 642 ld->ops->receive_buf(tty, data, flags, count); 643 tty_ldisc_deref(ld); 644 } 645} 646 647/* tty callbacks */ 648 649static int open(struct tty_struct *tty, struct file *filp) 650{ 651 struct slgt_info *info; 652 int retval, line; 653 unsigned long flags; 654 655 line = tty->index; 656 if (line >= slgt_device_count) { 657 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line)); 658 return -ENODEV; 659 } 660 661 info = slgt_device_list; 662 while(info && info->line != line) 663 info = info->next_device; 664 if (sanity_check(info, tty->name, "open")) 665 return -ENODEV; 666 if (info->init_error) { 667 DBGERR(("%s init error=%d\n", info->device_name, info->init_error)); 668 return -ENODEV; 669 } 670 671 tty->driver_data = info; 672 info->port.tty = tty; 673 674 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count)); 675 676 /* If port is closing, signal caller to try again */ 677 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){ 678 if (info->port.flags & ASYNC_CLOSING) 679 interruptible_sleep_on(&info->port.close_wait); 680 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ? 681 -EAGAIN : -ERESTARTSYS); 682 goto cleanup; 683 } 684 685 mutex_lock(&info->port.mutex); 686 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; 687 688 spin_lock_irqsave(&info->netlock, flags); 689 if (info->netcount) { 690 retval = -EBUSY; 691 spin_unlock_irqrestore(&info->netlock, flags); 692 mutex_unlock(&info->port.mutex); 693 goto cleanup; 694 } 695 info->port.count++; 696 spin_unlock_irqrestore(&info->netlock, flags); 697 698 if (info->port.count == 1) { 699 /* 1st open on this device, init hardware */ 700 retval = startup(info); 701 if (retval < 0) { 702 mutex_unlock(&info->port.mutex); 703 goto cleanup; 704 } 705 } 706 mutex_unlock(&info->port.mutex); 707 retval = block_til_ready(tty, filp, info); 708 if (retval) { 709 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval)); 710 goto cleanup; 711 } 712 713 retval = 0; 714 715cleanup: 716 if (retval) { 717 if (tty->count == 1) 718 info->port.tty = NULL; /* tty layer will release tty struct */ 719 if(info->port.count) 720 info->port.count--; 721 } 722 723 DBGINFO(("%s open rc=%d\n", info->device_name, retval)); 724 return retval; 725} 726 727static void close(struct tty_struct *tty, struct file *filp) 728{ 729 struct slgt_info *info = tty->driver_data; 730 731 if (sanity_check(info, tty->name, "close")) 732 return; 733 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count)); 734 735 if (tty_port_close_start(&info->port, tty, filp) == 0) 736 goto cleanup; 737 738 mutex_lock(&info->port.mutex); 739 if (info->port.flags & ASYNC_INITIALIZED) 740 wait_until_sent(tty, info->timeout); 741 flush_buffer(tty); 742 tty_ldisc_flush(tty); 743 744 shutdown(info); 745 mutex_unlock(&info->port.mutex); 746 747 tty_port_close_end(&info->port, tty); 748 info->port.tty = NULL; 749cleanup: 750 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count)); 751} 752 753static void hangup(struct tty_struct *tty) 754{ 755 struct slgt_info *info = tty->driver_data; 756 unsigned long flags; 757 758 if (sanity_check(info, tty->name, "hangup")) 759 return; 760 DBGINFO(("%s hangup\n", info->device_name)); 761 762 flush_buffer(tty); 763 764 mutex_lock(&info->port.mutex); 765 shutdown(info); 766 767 spin_lock_irqsave(&info->port.lock, flags); 768 info->port.count = 0; 769 info->port.flags &= ~ASYNC_NORMAL_ACTIVE; 770 info->port.tty = NULL; 771 spin_unlock_irqrestore(&info->port.lock, flags); 772 mutex_unlock(&info->port.mutex); 773 774 wake_up_interruptible(&info->port.open_wait); 775} 776 777static void set_termios(struct tty_struct *tty, struct ktermios *old_termios) 778{ 779 struct slgt_info *info = tty->driver_data; 780 unsigned long flags; 781 782 DBGINFO(("%s set_termios\n", tty->driver->name)); 783 784 change_params(info); 785 786 /* Handle transition to B0 status */ 787 if (old_termios->c_cflag & CBAUD && 788 !(tty->termios.c_cflag & CBAUD)) { 789 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); 790 spin_lock_irqsave(&info->lock,flags); 791 set_signals(info); 792 spin_unlock_irqrestore(&info->lock,flags); 793 } 794 795 /* Handle transition away from B0 status */ 796 if (!(old_termios->c_cflag & CBAUD) && 797 tty->termios.c_cflag & CBAUD) { 798 info->signals |= SerialSignal_DTR; 799 if (!(tty->termios.c_cflag & CRTSCTS) || 800 !test_bit(TTY_THROTTLED, &tty->flags)) { 801 info->signals |= SerialSignal_RTS; 802 } 803 spin_lock_irqsave(&info->lock,flags); 804 set_signals(info); 805 spin_unlock_irqrestore(&info->lock,flags); 806 } 807 808 /* Handle turning off CRTSCTS */ 809 if (old_termios->c_cflag & CRTSCTS && 810 !(tty->termios.c_cflag & CRTSCTS)) { 811 tty->hw_stopped = 0; 812 tx_release(tty); 813 } 814} 815 816static void update_tx_timer(struct slgt_info *info) 817{ 818 /* 819 * use worst case speed of 1200bps to calculate transmit timeout 820 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes) 821 */ 822 if (info->params.mode == MGSL_MODE_HDLC) { 823 int timeout = (tbuf_bytes(info) * 7) + 1000; 824 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout)); 825 } 826} 827 828static int write(struct tty_struct *tty, 829 const unsigned char *buf, int count) 830{ 831 int ret = 0; 832 struct slgt_info *info = tty->driver_data; 833 unsigned long flags; 834 835 if (sanity_check(info, tty->name, "write")) 836 return -EIO; 837 838 DBGINFO(("%s write count=%d\n", info->device_name, count)); 839 840 if (!info->tx_buf || (count > info->max_frame_size)) 841 return -EIO; 842 843 if (!count || tty->stopped || tty->hw_stopped) 844 return 0; 845 846 spin_lock_irqsave(&info->lock, flags); 847 848 if (info->tx_count) { 849 /* send accumulated data from send_char() */ 850 if (!tx_load(info, info->tx_buf, info->tx_count)) 851 goto cleanup; 852 info->tx_count = 0; 853 } 854 855 if (tx_load(info, buf, count)) 856 ret = count; 857 858cleanup: 859 spin_unlock_irqrestore(&info->lock, flags); 860 DBGINFO(("%s write rc=%d\n", info->device_name, ret)); 861 return ret; 862} 863 864static int put_char(struct tty_struct *tty, unsigned char ch) 865{ 866 struct slgt_info *info = tty->driver_data; 867 unsigned long flags; 868 int ret = 0; 869 870 if (sanity_check(info, tty->name, "put_char")) 871 return 0; 872 DBGINFO(("%s put_char(%d)\n", info->device_name, ch)); 873 if (!info->tx_buf) 874 return 0; 875 spin_lock_irqsave(&info->lock,flags); 876 if (info->tx_count < info->max_frame_size) { 877 info->tx_buf[info->tx_count++] = ch; 878 ret = 1; 879 } 880 spin_unlock_irqrestore(&info->lock,flags); 881 return ret; 882} 883 884static void send_xchar(struct tty_struct *tty, char ch) 885{ 886 struct slgt_info *info = tty->driver_data; 887 unsigned long flags; 888 889 if (sanity_check(info, tty->name, "send_xchar")) 890 return; 891 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch)); 892 info->x_char = ch; 893 if (ch) { 894 spin_lock_irqsave(&info->lock,flags); 895 if (!info->tx_enabled) 896 tx_start(info); 897 spin_unlock_irqrestore(&info->lock,flags); 898 } 899} 900 901static void wait_until_sent(struct tty_struct *tty, int timeout) 902{ 903 struct slgt_info *info = tty->driver_data; 904 unsigned long orig_jiffies, char_time; 905 906 if (!info ) 907 return; 908 if (sanity_check(info, tty->name, "wait_until_sent")) 909 return; 910 DBGINFO(("%s wait_until_sent entry\n", info->device_name)); 911 if (!(info->port.flags & ASYNC_INITIALIZED)) 912 goto exit; 913 914 orig_jiffies = jiffies; 915 916 /* Set check interval to 1/5 of estimated time to 917 * send a character, and make it at least 1. The check 918 * interval should also be less than the timeout. 919 * Note: use tight timings here to satisfy the NIST-PCTS. 920 */ 921 922 if (info->params.data_rate) { 923 char_time = info->timeout/(32 * 5); 924 if (!char_time) 925 char_time++; 926 } else 927 char_time = 1; 928 929 if (timeout) 930 char_time = min_t(unsigned long, char_time, timeout); 931 932 while (info->tx_active) { 933 msleep_interruptible(jiffies_to_msecs(char_time)); 934 if (signal_pending(current)) 935 break; 936 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 937 break; 938 } 939exit: 940 DBGINFO(("%s wait_until_sent exit\n", info->device_name)); 941} 942 943static int write_room(struct tty_struct *tty) 944{ 945 struct slgt_info *info = tty->driver_data; 946 int ret; 947 948 if (sanity_check(info, tty->name, "write_room")) 949 return 0; 950 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE; 951 DBGINFO(("%s write_room=%d\n", info->device_name, ret)); 952 return ret; 953} 954 955static void flush_chars(struct tty_struct *tty) 956{ 957 struct slgt_info *info = tty->driver_data; 958 unsigned long flags; 959 960 if (sanity_check(info, tty->name, "flush_chars")) 961 return; 962 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count)); 963 964 if (info->tx_count <= 0 || tty->stopped || 965 tty->hw_stopped || !info->tx_buf) 966 return; 967 968 DBGINFO(("%s flush_chars start transmit\n", info->device_name)); 969 970 spin_lock_irqsave(&info->lock,flags); 971 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) 972 info->tx_count = 0; 973 spin_unlock_irqrestore(&info->lock,flags); 974} 975 976static void flush_buffer(struct tty_struct *tty) 977{ 978 struct slgt_info *info = tty->driver_data; 979 unsigned long flags; 980 981 if (sanity_check(info, tty->name, "flush_buffer")) 982 return; 983 DBGINFO(("%s flush_buffer\n", info->device_name)); 984 985 spin_lock_irqsave(&info->lock, flags); 986 info->tx_count = 0; 987 spin_unlock_irqrestore(&info->lock, flags); 988 989 tty_wakeup(tty); 990} 991 992/* 993 * throttle (stop) transmitter 994 */ 995static void tx_hold(struct tty_struct *tty) 996{ 997 struct slgt_info *info = tty->driver_data; 998 unsigned long flags; 999 1000 if (sanity_check(info, tty->name, "tx_hold")) 1001 return; 1002 DBGINFO(("%s tx_hold\n", info->device_name)); 1003 spin_lock_irqsave(&info->lock,flags); 1004 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC) 1005 tx_stop(info); 1006 spin_unlock_irqrestore(&info->lock,flags); 1007} 1008 1009/* 1010 * release (start) transmitter 1011 */ 1012static void tx_release(struct tty_struct *tty) 1013{ 1014 struct slgt_info *info = tty->driver_data; 1015 unsigned long flags; 1016 1017 if (sanity_check(info, tty->name, "tx_release")) 1018 return; 1019 DBGINFO(("%s tx_release\n", info->device_name)); 1020 spin_lock_irqsave(&info->lock, flags); 1021 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) 1022 info->tx_count = 0; 1023 spin_unlock_irqrestore(&info->lock, flags); 1024} 1025 1026/* 1027 * Service an IOCTL request 1028 * 1029 * Arguments 1030 * 1031 * tty pointer to tty instance data 1032 * cmd IOCTL command code 1033 * arg command argument/context 1034 * 1035 * Return 0 if success, otherwise error code 1036 */ 1037static int ioctl(struct tty_struct *tty, 1038 unsigned int cmd, unsigned long arg) 1039{ 1040 struct slgt_info *info = tty->driver_data; 1041 void __user *argp = (void __user *)arg; 1042 int ret; 1043 1044 if (sanity_check(info, tty->name, "ioctl")) 1045 return -ENODEV; 1046 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd)); 1047 1048 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1049 (cmd != TIOCMIWAIT)) { 1050 if (tty->flags & (1 << TTY_IO_ERROR)) 1051 return -EIO; 1052 } 1053 1054 switch (cmd) { 1055 case MGSL_IOCWAITEVENT: 1056 return wait_mgsl_event(info, argp); 1057 case TIOCMIWAIT: 1058 return modem_input_wait(info,(int)arg); 1059 case MGSL_IOCSGPIO: 1060 return set_gpio(info, argp); 1061 case MGSL_IOCGGPIO: 1062 return get_gpio(info, argp); 1063 case MGSL_IOCWAITGPIO: 1064 return wait_gpio(info, argp); 1065 case MGSL_IOCGXSYNC: 1066 return get_xsync(info, argp); 1067 case MGSL_IOCSXSYNC: 1068 return set_xsync(info, (int)arg); 1069 case MGSL_IOCGXCTRL: 1070 return get_xctrl(info, argp); 1071 case MGSL_IOCSXCTRL: 1072 return set_xctrl(info, (int)arg); 1073 } 1074 mutex_lock(&info->port.mutex); 1075 switch (cmd) { 1076 case MGSL_IOCGPARAMS: 1077 ret = get_params(info, argp); 1078 break; 1079 case MGSL_IOCSPARAMS: 1080 ret = set_params(info, argp); 1081 break; 1082 case MGSL_IOCGTXIDLE: 1083 ret = get_txidle(info, argp); 1084 break; 1085 case MGSL_IOCSTXIDLE: 1086 ret = set_txidle(info, (int)arg); 1087 break; 1088 case MGSL_IOCTXENABLE: 1089 ret = tx_enable(info, (int)arg); 1090 break; 1091 case MGSL_IOCRXENABLE: 1092 ret = rx_enable(info, (int)arg); 1093 break; 1094 case MGSL_IOCTXABORT: 1095 ret = tx_abort(info); 1096 break; 1097 case MGSL_IOCGSTATS: 1098 ret = get_stats(info, argp); 1099 break; 1100 case MGSL_IOCGIF: 1101 ret = get_interface(info, argp); 1102 break; 1103 case MGSL_IOCSIF: 1104 ret = set_interface(info,(int)arg); 1105 break; 1106 default: 1107 ret = -ENOIOCTLCMD; 1108 } 1109 mutex_unlock(&info->port.mutex); 1110 return ret; 1111} 1112 1113static int get_icount(struct tty_struct *tty, 1114 struct serial_icounter_struct *icount) 1115 1116{ 1117 struct slgt_info *info = tty->driver_data; 1118 struct mgsl_icount cnow; /* kernel counter temps */ 1119 unsigned long flags; 1120 1121 spin_lock_irqsave(&info->lock,flags); 1122 cnow = info->icount; 1123 spin_unlock_irqrestore(&info->lock,flags); 1124 1125 icount->cts = cnow.cts; 1126 icount->dsr = cnow.dsr; 1127 icount->rng = cnow.rng; 1128 icount->dcd = cnow.dcd; 1129 icount->rx = cnow.rx; 1130 icount->tx = cnow.tx; 1131 icount->frame = cnow.frame; 1132 icount->overrun = cnow.overrun; 1133 icount->parity = cnow.parity; 1134 icount->brk = cnow.brk; 1135 icount->buf_overrun = cnow.buf_overrun; 1136 1137 return 0; 1138} 1139 1140/* 1141 * support for 32 bit ioctl calls on 64 bit systems 1142 */ 1143#ifdef CONFIG_COMPAT 1144static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params) 1145{ 1146 struct MGSL_PARAMS32 tmp_params; 1147 1148 DBGINFO(("%s get_params32\n", info->device_name)); 1149 memset(&tmp_params, 0, sizeof(tmp_params)); 1150 tmp_params.mode = (compat_ulong_t)info->params.mode; 1151 tmp_params.loopback = info->params.loopback; 1152 tmp_params.flags = info->params.flags; 1153 tmp_params.encoding = info->params.encoding; 1154 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed; 1155 tmp_params.addr_filter = info->params.addr_filter; 1156 tmp_params.crc_type = info->params.crc_type; 1157 tmp_params.preamble_length = info->params.preamble_length; 1158 tmp_params.preamble = info->params.preamble; 1159 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate; 1160 tmp_params.data_bits = info->params.data_bits; 1161 tmp_params.stop_bits = info->params.stop_bits; 1162 tmp_params.parity = info->params.parity; 1163 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32))) 1164 return -EFAULT; 1165 return 0; 1166} 1167 1168static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params) 1169{ 1170 struct MGSL_PARAMS32 tmp_params; 1171 1172 DBGINFO(("%s set_params32\n", info->device_name)); 1173 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32))) 1174 return -EFAULT; 1175 1176 spin_lock(&info->lock); 1177 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) { 1178 info->base_clock = tmp_params.clock_speed; 1179 } else { 1180 info->params.mode = tmp_params.mode; 1181 info->params.loopback = tmp_params.loopback; 1182 info->params.flags = tmp_params.flags; 1183 info->params.encoding = tmp_params.encoding; 1184 info->params.clock_speed = tmp_params.clock_speed; 1185 info->params.addr_filter = tmp_params.addr_filter; 1186 info->params.crc_type = tmp_params.crc_type; 1187 info->params.preamble_length = tmp_params.preamble_length; 1188 info->params.preamble = tmp_params.preamble; 1189 info->params.data_rate = tmp_params.data_rate; 1190 info->params.data_bits = tmp_params.data_bits; 1191 info->params.stop_bits = tmp_params.stop_bits; 1192 info->params.parity = tmp_params.parity; 1193 } 1194 spin_unlock(&info->lock); 1195 1196 program_hw(info); 1197 1198 return 0; 1199} 1200 1201static long slgt_compat_ioctl(struct tty_struct *tty, 1202 unsigned int cmd, unsigned long arg) 1203{ 1204 struct slgt_info *info = tty->driver_data; 1205 int rc = -ENOIOCTLCMD; 1206 1207 if (sanity_check(info, tty->name, "compat_ioctl")) 1208 return -ENODEV; 1209 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd)); 1210 1211 switch (cmd) { 1212 1213 case MGSL_IOCSPARAMS32: 1214 rc = set_params32(info, compat_ptr(arg)); 1215 break; 1216 1217 case MGSL_IOCGPARAMS32: 1218 rc = get_params32(info, compat_ptr(arg)); 1219 break; 1220 1221 case MGSL_IOCGPARAMS: 1222 case MGSL_IOCSPARAMS: 1223 case MGSL_IOCGTXIDLE: 1224 case MGSL_IOCGSTATS: 1225 case MGSL_IOCWAITEVENT: 1226 case MGSL_IOCGIF: 1227 case MGSL_IOCSGPIO: 1228 case MGSL_IOCGGPIO: 1229 case MGSL_IOCWAITGPIO: 1230 case MGSL_IOCGXSYNC: 1231 case MGSL_IOCGXCTRL: 1232 case MGSL_IOCSTXIDLE: 1233 case MGSL_IOCTXENABLE: 1234 case MGSL_IOCRXENABLE: 1235 case MGSL_IOCTXABORT: 1236 case TIOCMIWAIT: 1237 case MGSL_IOCSIF: 1238 case MGSL_IOCSXSYNC: 1239 case MGSL_IOCSXCTRL: 1240 rc = ioctl(tty, cmd, arg); 1241 break; 1242 } 1243 1244 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc)); 1245 return rc; 1246} 1247#else 1248#define slgt_compat_ioctl NULL 1249#endif /* ifdef CONFIG_COMPAT */ 1250 1251/* 1252 * proc fs support 1253 */ 1254static inline void line_info(struct seq_file *m, struct slgt_info *info) 1255{ 1256 char stat_buf[30]; 1257 unsigned long flags; 1258 1259 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n", 1260 info->device_name, info->phys_reg_addr, 1261 info->irq_level, info->max_frame_size); 1262 1263 /* output current serial signal states */ 1264 spin_lock_irqsave(&info->lock,flags); 1265 get_signals(info); 1266 spin_unlock_irqrestore(&info->lock,flags); 1267 1268 stat_buf[0] = 0; 1269 stat_buf[1] = 0; 1270 if (info->signals & SerialSignal_RTS) 1271 strcat(stat_buf, "|RTS"); 1272 if (info->signals & SerialSignal_CTS) 1273 strcat(stat_buf, "|CTS"); 1274 if (info->signals & SerialSignal_DTR) 1275 strcat(stat_buf, "|DTR"); 1276 if (info->signals & SerialSignal_DSR) 1277 strcat(stat_buf, "|DSR"); 1278 if (info->signals & SerialSignal_DCD) 1279 strcat(stat_buf, "|CD"); 1280 if (info->signals & SerialSignal_RI) 1281 strcat(stat_buf, "|RI"); 1282 1283 if (info->params.mode != MGSL_MODE_ASYNC) { 1284 seq_printf(m, "\tHDLC txok:%d rxok:%d", 1285 info->icount.txok, info->icount.rxok); 1286 if (info->icount.txunder) 1287 seq_printf(m, " txunder:%d", info->icount.txunder); 1288 if (info->icount.txabort) 1289 seq_printf(m, " txabort:%d", info->icount.txabort); 1290 if (info->icount.rxshort) 1291 seq_printf(m, " rxshort:%d", info->icount.rxshort); 1292 if (info->icount.rxlong) 1293 seq_printf(m, " rxlong:%d", info->icount.rxlong); 1294 if (info->icount.rxover) 1295 seq_printf(m, " rxover:%d", info->icount.rxover); 1296 if (info->icount.rxcrc) 1297 seq_printf(m, " rxcrc:%d", info->icount.rxcrc); 1298 } else { 1299 seq_printf(m, "\tASYNC tx:%d rx:%d", 1300 info->icount.tx, info->icount.rx); 1301 if (info->icount.frame) 1302 seq_printf(m, " fe:%d", info->icount.frame); 1303 if (info->icount.parity) 1304 seq_printf(m, " pe:%d", info->icount.parity); 1305 if (info->icount.brk) 1306 seq_printf(m, " brk:%d", info->icount.brk); 1307 if (info->icount.overrun) 1308 seq_printf(m, " oe:%d", info->icount.overrun); 1309 } 1310 1311 /* Append serial signal status to end */ 1312 seq_printf(m, " %s\n", stat_buf+1); 1313 1314 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", 1315 info->tx_active,info->bh_requested,info->bh_running, 1316 info->pending_bh); 1317} 1318 1319/* Called to print information about devices 1320 */ 1321static int synclink_gt_proc_show(struct seq_file *m, void *v) 1322{ 1323 struct slgt_info *info; 1324 1325 seq_puts(m, "synclink_gt driver\n"); 1326 1327 info = slgt_device_list; 1328 while( info ) { 1329 line_info(m, info); 1330 info = info->next_device; 1331 } 1332 return 0; 1333} 1334 1335static int synclink_gt_proc_open(struct inode *inode, struct file *file) 1336{ 1337 return single_open(file, synclink_gt_proc_show, NULL); 1338} 1339 1340static const struct file_operations synclink_gt_proc_fops = { 1341 .owner = THIS_MODULE, 1342 .open = synclink_gt_proc_open, 1343 .read = seq_read, 1344 .llseek = seq_lseek, 1345 .release = single_release, 1346}; 1347 1348/* 1349 * return count of bytes in transmit buffer 1350 */ 1351static int chars_in_buffer(struct tty_struct *tty) 1352{ 1353 struct slgt_info *info = tty->driver_data; 1354 int count; 1355 if (sanity_check(info, tty->name, "chars_in_buffer")) 1356 return 0; 1357 count = tbuf_bytes(info); 1358 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count)); 1359 return count; 1360} 1361 1362/* 1363 * signal remote device to throttle send data (our receive data) 1364 */ 1365static void throttle(struct tty_struct * tty) 1366{ 1367 struct slgt_info *info = tty->driver_data; 1368 unsigned long flags; 1369 1370 if (sanity_check(info, tty->name, "throttle")) 1371 return; 1372 DBGINFO(("%s throttle\n", info->device_name)); 1373 if (I_IXOFF(tty)) 1374 send_xchar(tty, STOP_CHAR(tty)); 1375 if (tty->termios.c_cflag & CRTSCTS) { 1376 spin_lock_irqsave(&info->lock,flags); 1377 info->signals &= ~SerialSignal_RTS; 1378 set_signals(info); 1379 spin_unlock_irqrestore(&info->lock,flags); 1380 } 1381} 1382 1383/* 1384 * signal remote device to stop throttling send data (our receive data) 1385 */ 1386static void unthrottle(struct tty_struct * tty) 1387{ 1388 struct slgt_info *info = tty->driver_data; 1389 unsigned long flags; 1390 1391 if (sanity_check(info, tty->name, "unthrottle")) 1392 return; 1393 DBGINFO(("%s unthrottle\n", info->device_name)); 1394 if (I_IXOFF(tty)) { 1395 if (info->x_char) 1396 info->x_char = 0; 1397 else 1398 send_xchar(tty, START_CHAR(tty)); 1399 } 1400 if (tty->termios.c_cflag & CRTSCTS) { 1401 spin_lock_irqsave(&info->lock,flags); 1402 info->signals |= SerialSignal_RTS; 1403 set_signals(info); 1404 spin_unlock_irqrestore(&info->lock,flags); 1405 } 1406} 1407 1408/* 1409 * set or clear transmit break condition 1410 * break_state -1=set break condition, 0=clear 1411 */ 1412static int set_break(struct tty_struct *tty, int break_state) 1413{ 1414 struct slgt_info *info = tty->driver_data; 1415 unsigned short value; 1416 unsigned long flags; 1417 1418 if (sanity_check(info, tty->name, "set_break")) 1419 return -EINVAL; 1420 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state)); 1421 1422 spin_lock_irqsave(&info->lock,flags); 1423 value = rd_reg16(info, TCR); 1424 if (break_state == -1) 1425 value |= BIT6; 1426 else 1427 value &= ~BIT6; 1428 wr_reg16(info, TCR, value); 1429 spin_unlock_irqrestore(&info->lock,flags); 1430 return 0; 1431} 1432 1433#if SYNCLINK_GENERIC_HDLC 1434 1435/** 1436 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.) 1437 * set encoding and frame check sequence (FCS) options 1438 * 1439 * dev pointer to network device structure 1440 * encoding serial encoding setting 1441 * parity FCS setting 1442 * 1443 * returns 0 if success, otherwise error code 1444 */ 1445static int hdlcdev_attach(struct net_device *dev, unsigned short encoding, 1446 unsigned short parity) 1447{ 1448 struct slgt_info *info = dev_to_port(dev); 1449 unsigned char new_encoding; 1450 unsigned short new_crctype; 1451 1452 /* return error if TTY interface open */ 1453 if (info->port.count) 1454 return -EBUSY; 1455 1456 DBGINFO(("%s hdlcdev_attach\n", info->device_name)); 1457 1458 switch (encoding) 1459 { 1460 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break; 1461 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break; 1462 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break; 1463 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break; 1464 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break; 1465 default: return -EINVAL; 1466 } 1467 1468 switch (parity) 1469 { 1470 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break; 1471 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break; 1472 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break; 1473 default: return -EINVAL; 1474 } 1475 1476 info->params.encoding = new_encoding; 1477 info->params.crc_type = new_crctype; 1478 1479 /* if network interface up, reprogram hardware */ 1480 if (info->netcount) 1481 program_hw(info); 1482 1483 return 0; 1484} 1485 1486/** 1487 * called by generic HDLC layer to send frame 1488 * 1489 * skb socket buffer containing HDLC frame 1490 * dev pointer to network device structure 1491 */ 1492static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb, 1493 struct net_device *dev) 1494{ 1495 struct slgt_info *info = dev_to_port(dev); 1496 unsigned long flags; 1497 1498 DBGINFO(("%s hdlc_xmit\n", dev->name)); 1499 1500 if (!skb->len) 1501 return NETDEV_TX_OK; 1502 1503 /* stop sending until this frame completes */ 1504 netif_stop_queue(dev); 1505 1506 /* update network statistics */ 1507 dev->stats.tx_packets++; 1508 dev->stats.tx_bytes += skb->len; 1509 1510 /* save start time for transmit timeout detection */ 1511 dev->trans_start = jiffies; 1512 1513 spin_lock_irqsave(&info->lock, flags); 1514 tx_load(info, skb->data, skb->len); 1515 spin_unlock_irqrestore(&info->lock, flags); 1516 1517 /* done with socket buffer, so free it */ 1518 dev_kfree_skb(skb); 1519 1520 return NETDEV_TX_OK; 1521} 1522 1523/** 1524 * called by network layer when interface enabled 1525 * claim resources and initialize hardware 1526 * 1527 * dev pointer to network device structure 1528 * 1529 * returns 0 if success, otherwise error code 1530 */ 1531static int hdlcdev_open(struct net_device *dev) 1532{ 1533 struct slgt_info *info = dev_to_port(dev); 1534 int rc; 1535 unsigned long flags; 1536 1537 if (!try_module_get(THIS_MODULE)) 1538 return -EBUSY; 1539 1540 DBGINFO(("%s hdlcdev_open\n", dev->name)); 1541 1542 /* generic HDLC layer open processing */ 1543 if ((rc = hdlc_open(dev))) 1544 return rc; 1545 1546 /* arbitrate between network and tty opens */ 1547 spin_lock_irqsave(&info->netlock, flags); 1548 if (info->port.count != 0 || info->netcount != 0) { 1549 DBGINFO(("%s hdlc_open busy\n", dev->name)); 1550 spin_unlock_irqrestore(&info->netlock, flags); 1551 return -EBUSY; 1552 } 1553 info->netcount=1; 1554 spin_unlock_irqrestore(&info->netlock, flags); 1555 1556 /* claim resources and init adapter */ 1557 if ((rc = startup(info)) != 0) { 1558 spin_lock_irqsave(&info->netlock, flags); 1559 info->netcount=0; 1560 spin_unlock_irqrestore(&info->netlock, flags); 1561 return rc; 1562 } 1563 1564 /* assert DTR and RTS, apply hardware settings */ 1565 info->signals |= SerialSignal_RTS + SerialSignal_DTR; 1566 program_hw(info); 1567 1568 /* enable network layer transmit */ 1569 dev->trans_start = jiffies; 1570 netif_start_queue(dev); 1571 1572 /* inform generic HDLC layer of current DCD status */ 1573 spin_lock_irqsave(&info->lock, flags); 1574 get_signals(info); 1575 spin_unlock_irqrestore(&info->lock, flags); 1576 if (info->signals & SerialSignal_DCD) 1577 netif_carrier_on(dev); 1578 else 1579 netif_carrier_off(dev); 1580 return 0; 1581} 1582 1583/** 1584 * called by network layer when interface is disabled 1585 * shutdown hardware and release resources 1586 * 1587 * dev pointer to network device structure 1588 * 1589 * returns 0 if success, otherwise error code 1590 */ 1591static int hdlcdev_close(struct net_device *dev) 1592{ 1593 struct slgt_info *info = dev_to_port(dev); 1594 unsigned long flags; 1595 1596 DBGINFO(("%s hdlcdev_close\n", dev->name)); 1597 1598 netif_stop_queue(dev); 1599 1600 /* shutdown adapter and release resources */ 1601 shutdown(info); 1602 1603 hdlc_close(dev); 1604 1605 spin_lock_irqsave(&info->netlock, flags); 1606 info->netcount=0; 1607 spin_unlock_irqrestore(&info->netlock, flags); 1608 1609 module_put(THIS_MODULE); 1610 return 0; 1611} 1612 1613/** 1614 * called by network layer to process IOCTL call to network device 1615 * 1616 * dev pointer to network device structure 1617 * ifr pointer to network interface request structure 1618 * cmd IOCTL command code 1619 * 1620 * returns 0 if success, otherwise error code 1621 */ 1622static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1623{ 1624 const size_t size = sizeof(sync_serial_settings); 1625 sync_serial_settings new_line; 1626 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync; 1627 struct slgt_info *info = dev_to_port(dev); 1628 unsigned int flags; 1629 1630 DBGINFO(("%s hdlcdev_ioctl\n", dev->name)); 1631 1632 /* return error if TTY interface open */ 1633 if (info->port.count) 1634 return -EBUSY; 1635 1636 if (cmd != SIOCWANDEV) 1637 return hdlc_ioctl(dev, ifr, cmd); 1638 1639 memset(&new_line, 0, sizeof(new_line)); 1640 1641 switch(ifr->ifr_settings.type) { 1642 case IF_GET_IFACE: /* return current sync_serial_settings */ 1643 1644 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL; 1645 if (ifr->ifr_settings.size < size) { 1646 ifr->ifr_settings.size = size; /* data size wanted */ 1647 return -ENOBUFS; 1648 } 1649 1650 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1651 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1652 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1653 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); 1654 1655 switch (flags){ 1656 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break; 1657 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break; 1658 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break; 1659 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break; 1660 default: new_line.clock_type = CLOCK_DEFAULT; 1661 } 1662 1663 new_line.clock_rate = info->params.clock_speed; 1664 new_line.loopback = info->params.loopback ? 1:0; 1665 1666 if (copy_to_user(line, &new_line, size)) 1667 return -EFAULT; 1668 return 0; 1669 1670 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */ 1671 1672 if(!capable(CAP_NET_ADMIN)) 1673 return -EPERM; 1674 if (copy_from_user(&new_line, line, size)) 1675 return -EFAULT; 1676 1677 switch (new_line.clock_type) 1678 { 1679 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break; 1680 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break; 1681 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break; 1682 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break; 1683 case CLOCK_DEFAULT: flags = info->params.flags & 1684 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1685 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1686 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1687 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break; 1688 default: return -EINVAL; 1689 } 1690 1691 if (new_line.loopback != 0 && new_line.loopback != 1) 1692 return -EINVAL; 1693 1694 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | 1695 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | 1696 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | 1697 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); 1698 info->params.flags |= flags; 1699 1700 info->params.loopback = new_line.loopback; 1701 1702 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG)) 1703 info->params.clock_speed = new_line.clock_rate; 1704 else 1705 info->params.clock_speed = 0; 1706 1707 /* if network interface up, reprogram hardware */ 1708 if (info->netcount) 1709 program_hw(info); 1710 return 0; 1711 1712 default: 1713 return hdlc_ioctl(dev, ifr, cmd); 1714 } 1715} 1716 1717/** 1718 * called by network layer when transmit timeout is detected 1719 * 1720 * dev pointer to network device structure 1721 */ 1722static void hdlcdev_tx_timeout(struct net_device *dev) 1723{ 1724 struct slgt_info *info = dev_to_port(dev); 1725 unsigned long flags; 1726 1727 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name)); 1728 1729 dev->stats.tx_errors++; 1730 dev->stats.tx_aborted_errors++; 1731 1732 spin_lock_irqsave(&info->lock,flags); 1733 tx_stop(info); 1734 spin_unlock_irqrestore(&info->lock,flags); 1735 1736 netif_wake_queue(dev); 1737} 1738 1739/** 1740 * called by device driver when transmit completes 1741 * reenable network layer transmit if stopped 1742 * 1743 * info pointer to device instance information 1744 */ 1745static void hdlcdev_tx_done(struct slgt_info *info) 1746{ 1747 if (netif_queue_stopped(info->netdev)) 1748 netif_wake_queue(info->netdev); 1749} 1750 1751/** 1752 * called by device driver when frame received 1753 * pass frame to network layer 1754 * 1755 * info pointer to device instance information 1756 * buf pointer to buffer contianing frame data 1757 * size count of data bytes in buf 1758 */ 1759static void hdlcdev_rx(struct slgt_info *info, char *buf, int size) 1760{ 1761 struct sk_buff *skb = dev_alloc_skb(size); 1762 struct net_device *dev = info->netdev; 1763 1764 DBGINFO(("%s hdlcdev_rx\n", dev->name)); 1765 1766 if (skb == NULL) { 1767 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name)); 1768 dev->stats.rx_dropped++; 1769 return; 1770 } 1771 1772 memcpy(skb_put(skb, size), buf, size); 1773 1774 skb->protocol = hdlc_type_trans(skb, dev); 1775 1776 dev->stats.rx_packets++; 1777 dev->stats.rx_bytes += size; 1778 1779 netif_rx(skb); 1780} 1781 1782static const struct net_device_ops hdlcdev_ops = { 1783 .ndo_open = hdlcdev_open, 1784 .ndo_stop = hdlcdev_close, 1785 .ndo_change_mtu = hdlc_change_mtu, 1786 .ndo_start_xmit = hdlc_start_xmit, 1787 .ndo_do_ioctl = hdlcdev_ioctl, 1788 .ndo_tx_timeout = hdlcdev_tx_timeout, 1789}; 1790 1791/** 1792 * called by device driver when adding device instance 1793 * do generic HDLC initialization 1794 * 1795 * info pointer to device instance information 1796 * 1797 * returns 0 if success, otherwise error code 1798 */ 1799static int hdlcdev_init(struct slgt_info *info) 1800{ 1801 int rc; 1802 struct net_device *dev; 1803 hdlc_device *hdlc; 1804 1805 /* allocate and initialize network and HDLC layer objects */ 1806 1807 if (!(dev = alloc_hdlcdev(info))) { 1808 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name); 1809 return -ENOMEM; 1810 } 1811 1812 /* for network layer reporting purposes only */ 1813 dev->mem_start = info->phys_reg_addr; 1814 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1; 1815 dev->irq = info->irq_level; 1816 1817 /* network layer callbacks and settings */ 1818 dev->netdev_ops = &hdlcdev_ops; 1819 dev->watchdog_timeo = 10 * HZ; 1820 dev->tx_queue_len = 50; 1821 1822 /* generic HDLC layer callbacks and settings */ 1823 hdlc = dev_to_hdlc(dev); 1824 hdlc->attach = hdlcdev_attach; 1825 hdlc->xmit = hdlcdev_xmit; 1826 1827 /* register objects with HDLC layer */ 1828 if ((rc = register_hdlc_device(dev))) { 1829 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__); 1830 free_netdev(dev); 1831 return rc; 1832 } 1833 1834 info->netdev = dev; 1835 return 0; 1836} 1837 1838/** 1839 * called by device driver when removing device instance 1840 * do generic HDLC cleanup 1841 * 1842 * info pointer to device instance information 1843 */ 1844static void hdlcdev_exit(struct slgt_info *info) 1845{ 1846 unregister_hdlc_device(info->netdev); 1847 free_netdev(info->netdev); 1848 info->netdev = NULL; 1849} 1850 1851#endif /* ifdef CONFIG_HDLC */ 1852 1853/* 1854 * get async data from rx DMA buffers 1855 */ 1856static void rx_async(struct slgt_info *info) 1857{ 1858 struct tty_struct *tty = info->port.tty; 1859 struct mgsl_icount *icount = &info->icount; 1860 unsigned int start, end; 1861 unsigned char *p; 1862 unsigned char status; 1863 struct slgt_desc *bufs = info->rbufs; 1864 int i, count; 1865 int chars = 0; 1866 int stat; 1867 unsigned char ch; 1868 1869 start = end = info->rbuf_current; 1870 1871 while(desc_complete(bufs[end])) { 1872 count = desc_count(bufs[end]) - info->rbuf_index; 1873 p = bufs[end].buf + info->rbuf_index; 1874 1875 DBGISR(("%s rx_async count=%d\n", info->device_name, count)); 1876 DBGDATA(info, p, count, "rx"); 1877 1878 for(i=0 ; i < count; i+=2, p+=2) { 1879 ch = *p; 1880 icount->rx++; 1881 1882 stat = 0; 1883 1884 if ((status = *(p+1) & (BIT1 + BIT0))) { 1885 if (status & BIT1) 1886 icount->parity++; 1887 else if (status & BIT0) 1888 icount->frame++; 1889 /* discard char if tty control flags say so */ 1890 if (status & info->ignore_status_mask) 1891 continue; 1892 if (status & BIT1) 1893 stat = TTY_PARITY; 1894 else if (status & BIT0) 1895 stat = TTY_FRAME; 1896 } 1897 if (tty) { 1898 tty_insert_flip_char(tty, ch, stat); 1899 chars++; 1900 } 1901 } 1902 1903 if (i < count) { 1904 /* receive buffer not completed */ 1905 info->rbuf_index += i; 1906 mod_timer(&info->rx_timer, jiffies + 1); 1907 break; 1908 } 1909 1910 info->rbuf_index = 0; 1911 free_rbufs(info, end, end); 1912 1913 if (++end == info->rbuf_count) 1914 end = 0; 1915 1916 /* if entire list searched then no frame available */ 1917 if (end == start) 1918 break; 1919 } 1920 1921 if (tty && chars) 1922 tty_flip_buffer_push(tty); 1923} 1924 1925/* 1926 * return next bottom half action to perform 1927 */ 1928static int bh_action(struct slgt_info *info) 1929{ 1930 unsigned long flags; 1931 int rc; 1932 1933 spin_lock_irqsave(&info->lock,flags); 1934 1935 if (info->pending_bh & BH_RECEIVE) { 1936 info->pending_bh &= ~BH_RECEIVE; 1937 rc = BH_RECEIVE; 1938 } else if (info->pending_bh & BH_TRANSMIT) { 1939 info->pending_bh &= ~BH_TRANSMIT; 1940 rc = BH_TRANSMIT; 1941 } else if (info->pending_bh & BH_STATUS) { 1942 info->pending_bh &= ~BH_STATUS; 1943 rc = BH_STATUS; 1944 } else { 1945 /* Mark BH routine as complete */ 1946 info->bh_running = false; 1947 info->bh_requested = false; 1948 rc = 0; 1949 } 1950 1951 spin_unlock_irqrestore(&info->lock,flags); 1952 1953 return rc; 1954} 1955 1956/* 1957 * perform bottom half processing 1958 */ 1959static void bh_handler(struct work_struct *work) 1960{ 1961 struct slgt_info *info = container_of(work, struct slgt_info, task); 1962 int action; 1963 1964 if (!info) 1965 return; 1966 info->bh_running = true; 1967 1968 while((action = bh_action(info))) { 1969 switch (action) { 1970 case BH_RECEIVE: 1971 DBGBH(("%s bh receive\n", info->device_name)); 1972 switch(info->params.mode) { 1973 case MGSL_MODE_ASYNC: 1974 rx_async(info); 1975 break; 1976 case MGSL_MODE_HDLC: 1977 while(rx_get_frame(info)); 1978 break; 1979 case MGSL_MODE_RAW: 1980 case MGSL_MODE_MONOSYNC: 1981 case MGSL_MODE_BISYNC: 1982 case MGSL_MODE_XSYNC: 1983 while(rx_get_buf(info)); 1984 break; 1985 } 1986 /* restart receiver if rx DMA buffers exhausted */ 1987 if (info->rx_restart) 1988 rx_start(info); 1989 break; 1990 case BH_TRANSMIT: 1991 bh_transmit(info); 1992 break; 1993 case BH_STATUS: 1994 DBGBH(("%s bh status\n", info->device_name)); 1995 info->ri_chkcount = 0; 1996 info->dsr_chkcount = 0; 1997 info->dcd_chkcount = 0; 1998 info->cts_chkcount = 0; 1999 break; 2000 default: 2001 DBGBH(("%s unknown action\n", info->device_name)); 2002 break; 2003 } 2004 } 2005 DBGBH(("%s bh_handler exit\n", info->device_name)); 2006} 2007 2008static void bh_transmit(struct slgt_info *info) 2009{ 2010 struct tty_struct *tty = info->port.tty; 2011 2012 DBGBH(("%s bh_transmit\n", info->device_name)); 2013 if (tty) 2014 tty_wakeup(tty); 2015} 2016 2017static void dsr_change(struct slgt_info *info, unsigned short status) 2018{ 2019 if (status & BIT3) { 2020 info->signals |= SerialSignal_DSR; 2021 info->input_signal_events.dsr_up++; 2022 } else { 2023 info->signals &= ~SerialSignal_DSR; 2024 info->input_signal_events.dsr_down++; 2025 } 2026 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals)); 2027 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2028 slgt_irq_off(info, IRQ_DSR); 2029 return; 2030 } 2031 info->icount.dsr++; 2032 wake_up_interruptible(&info->status_event_wait_q); 2033 wake_up_interruptible(&info->event_wait_q); 2034 info->pending_bh |= BH_STATUS; 2035} 2036 2037static void cts_change(struct slgt_info *info, unsigned short status) 2038{ 2039 if (status & BIT2) { 2040 info->signals |= SerialSignal_CTS; 2041 info->input_signal_events.cts_up++; 2042 } else { 2043 info->signals &= ~SerialSignal_CTS; 2044 info->input_signal_events.cts_down++; 2045 } 2046 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals)); 2047 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2048 slgt_irq_off(info, IRQ_CTS); 2049 return; 2050 } 2051 info->icount.cts++; 2052 wake_up_interruptible(&info->status_event_wait_q); 2053 wake_up_interruptible(&info->event_wait_q); 2054 info->pending_bh |= BH_STATUS; 2055 2056 if (info->port.flags & ASYNC_CTS_FLOW) { 2057 if (info->port.tty) { 2058 if (info->port.tty->hw_stopped) { 2059 if (info->signals & SerialSignal_CTS) { 2060 info->port.tty->hw_stopped = 0; 2061 info->pending_bh |= BH_TRANSMIT; 2062 return; 2063 } 2064 } else { 2065 if (!(info->signals & SerialSignal_CTS)) 2066 info->port.tty->hw_stopped = 1; 2067 } 2068 } 2069 } 2070} 2071 2072static void dcd_change(struct slgt_info *info, unsigned short status) 2073{ 2074 if (status & BIT1) { 2075 info->signals |= SerialSignal_DCD; 2076 info->input_signal_events.dcd_up++; 2077 } else { 2078 info->signals &= ~SerialSignal_DCD; 2079 info->input_signal_events.dcd_down++; 2080 } 2081 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals)); 2082 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2083 slgt_irq_off(info, IRQ_DCD); 2084 return; 2085 } 2086 info->icount.dcd++; 2087#if SYNCLINK_GENERIC_HDLC 2088 if (info->netcount) { 2089 if (info->signals & SerialSignal_DCD) 2090 netif_carrier_on(info->netdev); 2091 else 2092 netif_carrier_off(info->netdev); 2093 } 2094#endif 2095 wake_up_interruptible(&info->status_event_wait_q); 2096 wake_up_interruptible(&info->event_wait_q); 2097 info->pending_bh |= BH_STATUS; 2098 2099 if (info->port.flags & ASYNC_CHECK_CD) { 2100 if (info->signals & SerialSignal_DCD) 2101 wake_up_interruptible(&info->port.open_wait); 2102 else { 2103 if (info->port.tty) 2104 tty_hangup(info->port.tty); 2105 } 2106 } 2107} 2108 2109static void ri_change(struct slgt_info *info, unsigned short status) 2110{ 2111 if (status & BIT0) { 2112 info->signals |= SerialSignal_RI; 2113 info->input_signal_events.ri_up++; 2114 } else { 2115 info->signals &= ~SerialSignal_RI; 2116 info->input_signal_events.ri_down++; 2117 } 2118 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals)); 2119 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { 2120 slgt_irq_off(info, IRQ_RI); 2121 return; 2122 } 2123 info->icount.rng++; 2124 wake_up_interruptible(&info->status_event_wait_q); 2125 wake_up_interruptible(&info->event_wait_q); 2126 info->pending_bh |= BH_STATUS; 2127} 2128 2129static void isr_rxdata(struct slgt_info *info) 2130{ 2131 unsigned int count = info->rbuf_fill_count; 2132 unsigned int i = info->rbuf_fill_index; 2133 unsigned short reg; 2134 2135 while (rd_reg16(info, SSR) & IRQ_RXDATA) { 2136 reg = rd_reg16(info, RDR); 2137 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg)); 2138 if (desc_complete(info->rbufs[i])) { 2139 /* all buffers full */ 2140 rx_stop(info); 2141 info->rx_restart = 1; 2142 continue; 2143 } 2144 info->rbufs[i].buf[count++] = (unsigned char)reg; 2145 /* async mode saves status byte to buffer for each data byte */ 2146 if (info->params.mode == MGSL_MODE_ASYNC) 2147 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8); 2148 if (count == info->rbuf_fill_level || (reg & BIT10)) { 2149 /* buffer full or end of frame */ 2150 set_desc_count(info->rbufs[i], count); 2151 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8)); 2152 info->rbuf_fill_count = count = 0; 2153 if (++i == info->rbuf_count) 2154 i = 0; 2155 info->pending_bh |= BH_RECEIVE; 2156 } 2157 } 2158 2159 info->rbuf_fill_index = i; 2160 info->rbuf_fill_count = count; 2161} 2162 2163static void isr_serial(struct slgt_info *info) 2164{ 2165 unsigned short status = rd_reg16(info, SSR); 2166 2167 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status)); 2168 2169 wr_reg16(info, SSR, status); /* clear pending */ 2170 2171 info->irq_occurred = true; 2172 2173 if (info->params.mode == MGSL_MODE_ASYNC) { 2174 if (status & IRQ_TXIDLE) { 2175 if (info->tx_active) 2176 isr_txeom(info, status); 2177 } 2178 if (info->rx_pio && (status & IRQ_RXDATA)) 2179 isr_rxdata(info); 2180 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) { 2181 info->icount.brk++; 2182 /* process break detection if tty control allows */ 2183 if (info->port.tty) { 2184 if (!(status & info->ignore_status_mask)) { 2185 if (info->read_status_mask & MASK_BREAK) { 2186 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK); 2187 if (info->port.flags & ASYNC_SAK) 2188 do_SAK(info->port.tty); 2189 } 2190 } 2191 } 2192 } 2193 } else { 2194 if (status & (IRQ_TXIDLE + IRQ_TXUNDER)) 2195 isr_txeom(info, status); 2196 if (info->rx_pio && (status & IRQ_RXDATA)) 2197 isr_rxdata(info); 2198 if (status & IRQ_RXIDLE) { 2199 if (status & RXIDLE) 2200 info->icount.rxidle++; 2201 else 2202 info->icount.exithunt++; 2203 wake_up_interruptible(&info->event_wait_q); 2204 } 2205 2206 if (status & IRQ_RXOVER) 2207 rx_start(info); 2208 } 2209 2210 if (status & IRQ_DSR) 2211 dsr_change(info, status); 2212 if (status & IRQ_CTS) 2213 cts_change(info, status); 2214 if (status & IRQ_DCD) 2215 dcd_change(info, status); 2216 if (status & IRQ_RI) 2217 ri_change(info, status); 2218} 2219 2220static void isr_rdma(struct slgt_info *info) 2221{ 2222 unsigned int status = rd_reg32(info, RDCSR); 2223 2224 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status)); 2225 2226 /* RDCSR (rx DMA control/status) 2227 * 2228 * 31..07 reserved 2229 * 06 save status byte to DMA buffer 2230 * 05 error 2231 * 04 eol (end of list) 2232 * 03 eob (end of buffer) 2233 * 02 IRQ enable 2234 * 01 reset 2235 * 00 enable 2236 */ 2237 wr_reg32(info, RDCSR, status); /* clear pending */ 2238 2239 if (status & (BIT5 + BIT4)) { 2240 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name)); 2241 info->rx_restart = true; 2242 } 2243 info->pending_bh |= BH_RECEIVE; 2244} 2245 2246static void isr_tdma(struct slgt_info *info) 2247{ 2248 unsigned int status = rd_reg32(info, TDCSR); 2249 2250 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status)); 2251 2252 /* TDCSR (tx DMA control/status) 2253 * 2254 * 31..06 reserved 2255 * 05 error 2256 * 04 eol (end of list) 2257 * 03 eob (end of buffer) 2258 * 02 IRQ enable 2259 * 01 reset 2260 * 00 enable 2261 */ 2262 wr_reg32(info, TDCSR, status); /* clear pending */ 2263 2264 if (status & (BIT5 + BIT4 + BIT3)) { 2265 // another transmit buffer has completed 2266 // run bottom half to get more send data from user 2267 info->pending_bh |= BH_TRANSMIT; 2268 } 2269} 2270 2271/* 2272 * return true if there are unsent tx DMA buffers, otherwise false 2273 * 2274 * if there are unsent buffers then info->tbuf_start 2275 * is set to index of first unsent buffer 2276 */ 2277static bool unsent_tbufs(struct slgt_info *info) 2278{ 2279 unsigned int i = info->tbuf_current; 2280 bool rc = false; 2281 2282 /* 2283 * search backwards from last loaded buffer (precedes tbuf_current) 2284 * for first unsent buffer (desc_count > 0) 2285 */ 2286 2287 do { 2288 if (i) 2289 i--; 2290 else 2291 i = info->tbuf_count - 1; 2292 if (!desc_count(info->tbufs[i])) 2293 break; 2294 info->tbuf_start = i; 2295 rc = true; 2296 } while (i != info->tbuf_current); 2297 2298 return rc; 2299} 2300 2301static void isr_txeom(struct slgt_info *info, unsigned short status) 2302{ 2303 DBGISR(("%s txeom status=%04x\n", info->device_name, status)); 2304 2305 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); 2306 tdma_reset(info); 2307 if (status & IRQ_TXUNDER) { 2308 unsigned short val = rd_reg16(info, TCR); 2309 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ 2310 wr_reg16(info, TCR, val); /* clear reset bit */ 2311 } 2312 2313 if (info->tx_active) { 2314 if (info->params.mode != MGSL_MODE_ASYNC) { 2315 if (status & IRQ_TXUNDER) 2316 info->icount.txunder++; 2317 else if (status & IRQ_TXIDLE) 2318 info->icount.txok++; 2319 } 2320 2321 if (unsent_tbufs(info)) { 2322 tx_start(info); 2323 update_tx_timer(info); 2324 return; 2325 } 2326 info->tx_active = false; 2327 2328 del_timer(&info->tx_timer); 2329 2330 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) { 2331 info->signals &= ~SerialSignal_RTS; 2332 info->drop_rts_on_tx_done = false; 2333 set_signals(info); 2334 } 2335 2336#if SYNCLINK_GENERIC_HDLC 2337 if (info->netcount) 2338 hdlcdev_tx_done(info); 2339 else 2340#endif 2341 { 2342 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) { 2343 tx_stop(info); 2344 return; 2345 } 2346 info->pending_bh |= BH_TRANSMIT; 2347 } 2348 } 2349} 2350 2351static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state) 2352{ 2353 struct cond_wait *w, *prev; 2354 2355 /* wake processes waiting for specific transitions */ 2356 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) { 2357 if (w->data & changed) { 2358 w->data = state; 2359 wake_up_interruptible(&w->q); 2360 if (prev != NULL) 2361 prev->next = w->next; 2362 else 2363 info->gpio_wait_q = w->next; 2364 } else 2365 prev = w; 2366 } 2367} 2368 2369/* interrupt service routine 2370 * 2371 * irq interrupt number 2372 * dev_id device ID supplied during interrupt registration 2373 */ 2374static irqreturn_t slgt_interrupt(int dummy, void *dev_id) 2375{ 2376 struct slgt_info *info = dev_id; 2377 unsigned int gsr; 2378 unsigned int i; 2379 2380 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level)); 2381 2382 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) { 2383 DBGISR(("%s gsr=%08x\n", info->device_name, gsr)); 2384 info->irq_occurred = true; 2385 for(i=0; i < info->port_count ; i++) { 2386 if (info->port_array[i] == NULL) 2387 continue; 2388 spin_lock(&info->port_array[i]->lock); 2389 if (gsr & (BIT8 << i)) 2390 isr_serial(info->port_array[i]); 2391 if (gsr & (BIT16 << (i*2))) 2392 isr_rdma(info->port_array[i]); 2393 if (gsr & (BIT17 << (i*2))) 2394 isr_tdma(info->port_array[i]); 2395 spin_unlock(&info->port_array[i]->lock); 2396 } 2397 } 2398 2399 if (info->gpio_present) { 2400 unsigned int state; 2401 unsigned int changed; 2402 spin_lock(&info->lock); 2403 while ((changed = rd_reg32(info, IOSR)) != 0) { 2404 DBGISR(("%s iosr=%08x\n", info->device_name, changed)); 2405 /* read latched state of GPIO signals */ 2406 state = rd_reg32(info, IOVR); 2407 /* clear pending GPIO interrupt bits */ 2408 wr_reg32(info, IOSR, changed); 2409 for (i=0 ; i < info->port_count ; i++) { 2410 if (info->port_array[i] != NULL) 2411 isr_gpio(info->port_array[i], changed, state); 2412 } 2413 } 2414 spin_unlock(&info->lock); 2415 } 2416 2417 for(i=0; i < info->port_count ; i++) { 2418 struct slgt_info *port = info->port_array[i]; 2419 if (port == NULL) 2420 continue; 2421 spin_lock(&port->lock); 2422 if ((port->port.count || port->netcount) && 2423 port->pending_bh && !port->bh_running && 2424 !port->bh_requested) { 2425 DBGISR(("%s bh queued\n", port->device_name)); 2426 schedule_work(&port->task); 2427 port->bh_requested = true; 2428 } 2429 spin_unlock(&port->lock); 2430 } 2431 2432 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level)); 2433 return IRQ_HANDLED; 2434} 2435 2436static int startup(struct slgt_info *info) 2437{ 2438 DBGINFO(("%s startup\n", info->device_name)); 2439 2440 if (info->port.flags & ASYNC_INITIALIZED) 2441 return 0; 2442 2443 if (!info->tx_buf) { 2444 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL); 2445 if (!info->tx_buf) { 2446 DBGERR(("%s can't allocate tx buffer\n", info->device_name)); 2447 return -ENOMEM; 2448 } 2449 } 2450 2451 info->pending_bh = 0; 2452 2453 memset(&info->icount, 0, sizeof(info->icount)); 2454 2455 /* program hardware for current parameters */ 2456 change_params(info); 2457 2458 if (info->port.tty) 2459 clear_bit(TTY_IO_ERROR, &info->port.tty->flags); 2460 2461 info->port.flags |= ASYNC_INITIALIZED; 2462 2463 return 0; 2464} 2465 2466/* 2467 * called by close() and hangup() to shutdown hardware 2468 */ 2469static void shutdown(struct slgt_info *info) 2470{ 2471 unsigned long flags; 2472 2473 if (!(info->port.flags & ASYNC_INITIALIZED)) 2474 return; 2475 2476 DBGINFO(("%s shutdown\n", info->device_name)); 2477 2478 /* clear status wait queue because status changes */ 2479 /* can't happen after shutting down the hardware */ 2480 wake_up_interruptible(&info->status_event_wait_q); 2481 wake_up_interruptible(&info->event_wait_q); 2482 2483 del_timer_sync(&info->tx_timer); 2484 del_timer_sync(&info->rx_timer); 2485 2486 kfree(info->tx_buf); 2487 info->tx_buf = NULL; 2488 2489 spin_lock_irqsave(&info->lock,flags); 2490 2491 tx_stop(info); 2492 rx_stop(info); 2493 2494 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 2495 2496 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { 2497 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS); 2498 set_signals(info); 2499 } 2500 2501 flush_cond_wait(&info->gpio_wait_q); 2502 2503 spin_unlock_irqrestore(&info->lock,flags); 2504 2505 if (info->port.tty) 2506 set_bit(TTY_IO_ERROR, &info->port.tty->flags); 2507 2508 info->port.flags &= ~ASYNC_INITIALIZED; 2509} 2510 2511static void program_hw(struct slgt_info *info) 2512{ 2513 unsigned long flags; 2514 2515 spin_lock_irqsave(&info->lock,flags); 2516 2517 rx_stop(info); 2518 tx_stop(info); 2519 2520 if (info->params.mode != MGSL_MODE_ASYNC || 2521 info->netcount) 2522 sync_mode(info); 2523 else 2524 async_mode(info); 2525 2526 set_signals(info); 2527 2528 info->dcd_chkcount = 0; 2529 info->cts_chkcount = 0; 2530 info->ri_chkcount = 0; 2531 info->dsr_chkcount = 0; 2532 2533 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI); 2534 get_signals(info); 2535 2536 if (info->netcount || 2537 (info->port.tty && info->port.tty->termios.c_cflag & CREAD)) 2538 rx_start(info); 2539 2540 spin_unlock_irqrestore(&info->lock,flags); 2541} 2542 2543/* 2544 * reconfigure adapter based on new parameters 2545 */ 2546static void change_params(struct slgt_info *info) 2547{ 2548 unsigned cflag; 2549 int bits_per_char; 2550 2551 if (!info->port.tty) 2552 return; 2553 DBGINFO(("%s change_params\n", info->device_name)); 2554 2555 cflag = info->port.tty->termios.c_cflag; 2556 2557 /* if B0 rate (hangup) specified then negate DTR and RTS */ 2558 /* otherwise assert DTR and RTS */ 2559 if (cflag & CBAUD) 2560 info->signals |= SerialSignal_RTS + SerialSignal_DTR; 2561 else 2562 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); 2563 2564 /* byte size and parity */ 2565 2566 switch (cflag & CSIZE) { 2567 case CS5: info->params.data_bits = 5; break; 2568 case CS6: info->params.data_bits = 6; break; 2569 case CS7: info->params.data_bits = 7; break; 2570 case CS8: info->params.data_bits = 8; break; 2571 default: info->params.data_bits = 7; break; 2572 } 2573 2574 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1; 2575 2576 if (cflag & PARENB) 2577 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN; 2578 else 2579 info->params.parity = ASYNC_PARITY_NONE; 2580 2581 /* calculate number of jiffies to transmit a full 2582 * FIFO (32 bytes) at specified data rate 2583 */ 2584 bits_per_char = info->params.data_bits + 2585 info->params.stop_bits + 1; 2586 2587 info->params.data_rate = tty_get_baud_rate(info->port.tty); 2588 2589 if (info->params.data_rate) { 2590 info->timeout = (32*HZ*bits_per_char) / 2591 info->params.data_rate; 2592 } 2593 info->timeout += HZ/50; /* Add .02 seconds of slop */ 2594 2595 if (cflag & CRTSCTS) 2596 info->port.flags |= ASYNC_CTS_FLOW; 2597 else 2598 info->port.flags &= ~ASYNC_CTS_FLOW; 2599 2600 if (cflag & CLOCAL) 2601 info->port.flags &= ~ASYNC_CHECK_CD; 2602 else 2603 info->port.flags |= ASYNC_CHECK_CD; 2604 2605 /* process tty input control flags */ 2606 2607 info->read_status_mask = IRQ_RXOVER; 2608 if (I_INPCK(info->port.tty)) 2609 info->read_status_mask |= MASK_PARITY | MASK_FRAMING; 2610 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty)) 2611 info->read_status_mask |= MASK_BREAK; 2612 if (I_IGNPAR(info->port.tty)) 2613 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING; 2614 if (I_IGNBRK(info->port.tty)) { 2615 info->ignore_status_mask |= MASK_BREAK; 2616 /* If ignoring parity and break indicators, ignore 2617 * overruns too. (For real raw support). 2618 */ 2619 if (I_IGNPAR(info->port.tty)) 2620 info->ignore_status_mask |= MASK_OVERRUN; 2621 } 2622 2623 program_hw(info); 2624} 2625 2626static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount) 2627{ 2628 DBGINFO(("%s get_stats\n", info->device_name)); 2629 if (!user_icount) { 2630 memset(&info->icount, 0, sizeof(info->icount)); 2631 } else { 2632 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount))) 2633 return -EFAULT; 2634 } 2635 return 0; 2636} 2637 2638static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params) 2639{ 2640 DBGINFO(("%s get_params\n", info->device_name)); 2641 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS))) 2642 return -EFAULT; 2643 return 0; 2644} 2645 2646static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params) 2647{ 2648 unsigned long flags; 2649 MGSL_PARAMS tmp_params; 2650 2651 DBGINFO(("%s set_params\n", info->device_name)); 2652 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS))) 2653 return -EFAULT; 2654 2655 spin_lock_irqsave(&info->lock, flags); 2656 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) 2657 info->base_clock = tmp_params.clock_speed; 2658 else 2659 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS)); 2660 spin_unlock_irqrestore(&info->lock, flags); 2661 2662 program_hw(info); 2663 2664 return 0; 2665} 2666 2667static int get_txidle(struct slgt_info *info, int __user *idle_mode) 2668{ 2669 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode)); 2670 if (put_user(info->idle_mode, idle_mode)) 2671 return -EFAULT; 2672 return 0; 2673} 2674 2675static int set_txidle(struct slgt_info *info, int idle_mode) 2676{ 2677 unsigned long flags; 2678 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode)); 2679 spin_lock_irqsave(&info->lock,flags); 2680 info->idle_mode = idle_mode; 2681 if (info->params.mode != MGSL_MODE_ASYNC) 2682 tx_set_idle(info); 2683 spin_unlock_irqrestore(&info->lock,flags); 2684 return 0; 2685} 2686 2687static int tx_enable(struct slgt_info *info, int enable) 2688{ 2689 unsigned long flags; 2690 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable)); 2691 spin_lock_irqsave(&info->lock,flags); 2692 if (enable) { 2693 if (!info->tx_enabled) 2694 tx_start(info); 2695 } else { 2696 if (info->tx_enabled) 2697 tx_stop(info); 2698 } 2699 spin_unlock_irqrestore(&info->lock,flags); 2700 return 0; 2701} 2702 2703/* 2704 * abort transmit HDLC frame 2705 */ 2706static int tx_abort(struct slgt_info *info) 2707{ 2708 unsigned long flags; 2709 DBGINFO(("%s tx_abort\n", info->device_name)); 2710 spin_lock_irqsave(&info->lock,flags); 2711 tdma_reset(info); 2712 spin_unlock_irqrestore(&info->lock,flags); 2713 return 0; 2714} 2715 2716static int rx_enable(struct slgt_info *info, int enable) 2717{ 2718 unsigned long flags; 2719 unsigned int rbuf_fill_level; 2720 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable)); 2721 spin_lock_irqsave(&info->lock,flags); 2722 /* 2723 * enable[31..16] = receive DMA buffer fill level 2724 * 0 = noop (leave fill level unchanged) 2725 * fill level must be multiple of 4 and <= buffer size 2726 */ 2727 rbuf_fill_level = ((unsigned int)enable) >> 16; 2728 if (rbuf_fill_level) { 2729 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) { 2730 spin_unlock_irqrestore(&info->lock, flags); 2731 return -EINVAL; 2732 } 2733 info->rbuf_fill_level = rbuf_fill_level; 2734 if (rbuf_fill_level < 128) 2735 info->rx_pio = 1; /* PIO mode */ 2736 else 2737 info->rx_pio = 0; /* DMA mode */ 2738 rx_stop(info); /* restart receiver to use new fill level */ 2739 } 2740 2741 /* 2742 * enable[1..0] = receiver enable command 2743 * 0 = disable 2744 * 1 = enable 2745 * 2 = enable or force hunt mode if already enabled 2746 */ 2747 enable &= 3; 2748 if (enable) { 2749 if (!info->rx_enabled) 2750 rx_start(info); 2751 else if (enable == 2) { 2752 /* force hunt mode (write 1 to RCR[3]) */ 2753 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3); 2754 } 2755 } else { 2756 if (info->rx_enabled) 2757 rx_stop(info); 2758 } 2759 spin_unlock_irqrestore(&info->lock,flags); 2760 return 0; 2761} 2762 2763/* 2764 * wait for specified event to occur 2765 */ 2766static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr) 2767{ 2768 unsigned long flags; 2769 int s; 2770 int rc=0; 2771 struct mgsl_icount cprev, cnow; 2772 int events; 2773 int mask; 2774 struct _input_signal_events oldsigs, newsigs; 2775 DECLARE_WAITQUEUE(wait, current); 2776 2777 if (get_user(mask, mask_ptr)) 2778 return -EFAULT; 2779 2780 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask)); 2781 2782 spin_lock_irqsave(&info->lock,flags); 2783 2784 /* return immediately if state matches requested events */ 2785 get_signals(info); 2786 s = info->signals; 2787 2788 events = mask & 2789 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) + 2790 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) + 2791 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) + 2792 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) ); 2793 if (events) { 2794 spin_unlock_irqrestore(&info->lock,flags); 2795 goto exit; 2796 } 2797 2798 /* save current irq counts */ 2799 cprev = info->icount; 2800 oldsigs = info->input_signal_events; 2801 2802 /* enable hunt and idle irqs if needed */ 2803 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) { 2804 unsigned short val = rd_reg16(info, SCR); 2805 if (!(val & IRQ_RXIDLE)) 2806 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE)); 2807 } 2808 2809 set_current_state(TASK_INTERRUPTIBLE); 2810 add_wait_queue(&info->event_wait_q, &wait); 2811 2812 spin_unlock_irqrestore(&info->lock,flags); 2813 2814 for(;;) { 2815 schedule(); 2816 if (signal_pending(current)) { 2817 rc = -ERESTARTSYS; 2818 break; 2819 } 2820 2821 /* get current irq counts */ 2822 spin_lock_irqsave(&info->lock,flags); 2823 cnow = info->icount; 2824 newsigs = info->input_signal_events; 2825 set_current_state(TASK_INTERRUPTIBLE); 2826 spin_unlock_irqrestore(&info->lock,flags); 2827 2828 /* if no change, wait aborted for some reason */ 2829 if (newsigs.dsr_up == oldsigs.dsr_up && 2830 newsigs.dsr_down == oldsigs.dsr_down && 2831 newsigs.dcd_up == oldsigs.dcd_up && 2832 newsigs.dcd_down == oldsigs.dcd_down && 2833 newsigs.cts_up == oldsigs.cts_up && 2834 newsigs.cts_down == oldsigs.cts_down && 2835 newsigs.ri_up == oldsigs.ri_up && 2836 newsigs.ri_down == oldsigs.ri_down && 2837 cnow.exithunt == cprev.exithunt && 2838 cnow.rxidle == cprev.rxidle) { 2839 rc = -EIO; 2840 break; 2841 } 2842 2843 events = mask & 2844 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) + 2845 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) + 2846 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) + 2847 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) + 2848 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) + 2849 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) + 2850 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) + 2851 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) + 2852 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) + 2853 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) ); 2854 if (events) 2855 break; 2856 2857 cprev = cnow; 2858 oldsigs = newsigs; 2859 } 2860 2861 remove_wait_queue(&info->event_wait_q, &wait); 2862 set_current_state(TASK_RUNNING); 2863 2864 2865 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) { 2866 spin_lock_irqsave(&info->lock,flags); 2867 if (!waitqueue_active(&info->event_wait_q)) { 2868 /* disable enable exit hunt mode/idle rcvd IRQs */ 2869 wr_reg16(info, SCR, 2870 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE)); 2871 } 2872 spin_unlock_irqrestore(&info->lock,flags); 2873 } 2874exit: 2875 if (rc == 0) 2876 rc = put_user(events, mask_ptr); 2877 return rc; 2878} 2879 2880static int get_interface(struct slgt_info *info, int __user *if_mode) 2881{ 2882 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode)); 2883 if (put_user(info->if_mode, if_mode)) 2884 return -EFAULT; 2885 return 0; 2886} 2887 2888static int set_interface(struct slgt_info *info, int if_mode) 2889{ 2890 unsigned long flags; 2891 unsigned short val; 2892 2893 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode)); 2894 spin_lock_irqsave(&info->lock,flags); 2895 info->if_mode = if_mode; 2896 2897 msc_set_vcr(info); 2898 2899 /* TCR (tx control) 07 1=RTS driver control */ 2900 val = rd_reg16(info, TCR); 2901 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 2902 val |= BIT7; 2903 else 2904 val &= ~BIT7; 2905 wr_reg16(info, TCR, val); 2906 2907 spin_unlock_irqrestore(&info->lock,flags); 2908 return 0; 2909} 2910 2911static int get_xsync(struct slgt_info *info, int __user *xsync) 2912{ 2913 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync)); 2914 if (put_user(info->xsync, xsync)) 2915 return -EFAULT; 2916 return 0; 2917} 2918 2919/* 2920 * set extended sync pattern (1 to 4 bytes) for extended sync mode 2921 * 2922 * sync pattern is contained in least significant bytes of value 2923 * most significant byte of sync pattern is oldest (1st sent/detected) 2924 */ 2925static int set_xsync(struct slgt_info *info, int xsync) 2926{ 2927 unsigned long flags; 2928 2929 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync)); 2930 spin_lock_irqsave(&info->lock, flags); 2931 info->xsync = xsync; 2932 wr_reg32(info, XSR, xsync); 2933 spin_unlock_irqrestore(&info->lock, flags); 2934 return 0; 2935} 2936 2937static int get_xctrl(struct slgt_info *info, int __user *xctrl) 2938{ 2939 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl)); 2940 if (put_user(info->xctrl, xctrl)) 2941 return -EFAULT; 2942 return 0; 2943} 2944 2945/* 2946 * set extended control options 2947 * 2948 * xctrl[31:19] reserved, must be zero 2949 * xctrl[18:17] extended sync pattern length in bytes 2950 * 00 = 1 byte in xsr[7:0] 2951 * 01 = 2 bytes in xsr[15:0] 2952 * 10 = 3 bytes in xsr[23:0] 2953 * 11 = 4 bytes in xsr[31:0] 2954 * xctrl[16] 1 = enable terminal count, 0=disabled 2955 * xctrl[15:0] receive terminal count for fixed length packets 2956 * value is count minus one (0 = 1 byte packet) 2957 * when terminal count is reached, receiver 2958 * automatically returns to hunt mode and receive 2959 * FIFO contents are flushed to DMA buffers with 2960 * end of frame (EOF) status 2961 */ 2962static int set_xctrl(struct slgt_info *info, int xctrl) 2963{ 2964 unsigned long flags; 2965 2966 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl)); 2967 spin_lock_irqsave(&info->lock, flags); 2968 info->xctrl = xctrl; 2969 wr_reg32(info, XCR, xctrl); 2970 spin_unlock_irqrestore(&info->lock, flags); 2971 return 0; 2972} 2973 2974/* 2975 * set general purpose IO pin state and direction 2976 * 2977 * user_gpio fields: 2978 * state each bit indicates a pin state 2979 * smask set bit indicates pin state to set 2980 * dir each bit indicates a pin direction (0=input, 1=output) 2981 * dmask set bit indicates pin direction to set 2982 */ 2983static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 2984{ 2985 unsigned long flags; 2986 struct gpio_desc gpio; 2987 __u32 data; 2988 2989 if (!info->gpio_present) 2990 return -EINVAL; 2991 if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) 2992 return -EFAULT; 2993 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n", 2994 info->device_name, gpio.state, gpio.smask, 2995 gpio.dir, gpio.dmask)); 2996 2997 spin_lock_irqsave(&info->port_array[0]->lock, flags); 2998 if (gpio.dmask) { 2999 data = rd_reg32(info, IODR); 3000 data |= gpio.dmask & gpio.dir; 3001 data &= ~(gpio.dmask & ~gpio.dir); 3002 wr_reg32(info, IODR, data); 3003 } 3004 if (gpio.smask) { 3005 data = rd_reg32(info, IOVR); 3006 data |= gpio.smask & gpio.state; 3007 data &= ~(gpio.smask & ~gpio.state); 3008 wr_reg32(info, IOVR, data); 3009 } 3010 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3011 3012 return 0; 3013} 3014 3015/* 3016 * get general purpose IO pin state and direction 3017 */ 3018static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 3019{ 3020 struct gpio_desc gpio; 3021 if (!info->gpio_present) 3022 return -EINVAL; 3023 gpio.state = rd_reg32(info, IOVR); 3024 gpio.smask = 0xffffffff; 3025 gpio.dir = rd_reg32(info, IODR); 3026 gpio.dmask = 0xffffffff; 3027 if (copy_to_user(user_gpio, &gpio, sizeof(gpio))) 3028 return -EFAULT; 3029 DBGINFO(("%s get_gpio state=%08x dir=%08x\n", 3030 info->device_name, gpio.state, gpio.dir)); 3031 return 0; 3032} 3033 3034/* 3035 * conditional wait facility 3036 */ 3037static void init_cond_wait(struct cond_wait *w, unsigned int data) 3038{ 3039 init_waitqueue_head(&w->q); 3040 init_waitqueue_entry(&w->wait, current); 3041 w->data = data; 3042} 3043 3044static void add_cond_wait(struct cond_wait **head, struct cond_wait *w) 3045{ 3046 set_current_state(TASK_INTERRUPTIBLE); 3047 add_wait_queue(&w->q, &w->wait); 3048 w->next = *head; 3049 *head = w; 3050} 3051 3052static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw) 3053{ 3054 struct cond_wait *w, *prev; 3055 remove_wait_queue(&cw->q, &cw->wait); 3056 set_current_state(TASK_RUNNING); 3057 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) { 3058 if (w == cw) { 3059 if (prev != NULL) 3060 prev->next = w->next; 3061 else 3062 *head = w->next; 3063 break; 3064 } 3065 } 3066} 3067 3068static void flush_cond_wait(struct cond_wait **head) 3069{ 3070 while (*head != NULL) { 3071 wake_up_interruptible(&(*head)->q); 3072 *head = (*head)->next; 3073 } 3074} 3075 3076/* 3077 * wait for general purpose I/O pin(s) to enter specified state 3078 * 3079 * user_gpio fields: 3080 * state - bit indicates target pin state 3081 * smask - set bit indicates watched pin 3082 * 3083 * The wait ends when at least one watched pin enters the specified 3084 * state. When 0 (no error) is returned, user_gpio->state is set to the 3085 * state of all GPIO pins when the wait ends. 3086 * 3087 * Note: Each pin may be a dedicated input, dedicated output, or 3088 * configurable input/output. The number and configuration of pins 3089 * varies with the specific adapter model. Only input pins (dedicated 3090 * or configured) can be monitored with this function. 3091 */ 3092static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) 3093{ 3094 unsigned long flags; 3095 int rc = 0; 3096 struct gpio_desc gpio; 3097 struct cond_wait wait; 3098 u32 state; 3099 3100 if (!info->gpio_present) 3101 return -EINVAL; 3102 if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) 3103 return -EFAULT; 3104 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n", 3105 info->device_name, gpio.state, gpio.smask)); 3106 /* ignore output pins identified by set IODR bit */ 3107 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0) 3108 return -EINVAL; 3109 init_cond_wait(&wait, gpio.smask); 3110 3111 spin_lock_irqsave(&info->port_array[0]->lock, flags); 3112 /* enable interrupts for watched pins */ 3113 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask); 3114 /* get current pin states */ 3115 state = rd_reg32(info, IOVR); 3116 3117 if (gpio.smask & ~(state ^ gpio.state)) { 3118 /* already in target state */ 3119 gpio.state = state; 3120 } else { 3121 /* wait for target state */ 3122 add_cond_wait(&info->gpio_wait_q, &wait); 3123 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3124 schedule(); 3125 if (signal_pending(current)) 3126 rc = -ERESTARTSYS; 3127 else 3128 gpio.state = wait.data; 3129 spin_lock_irqsave(&info->port_array[0]->lock, flags); 3130 remove_cond_wait(&info->gpio_wait_q, &wait); 3131 } 3132 3133 /* disable all GPIO interrupts if no waiting processes */ 3134 if (info->gpio_wait_q == NULL) 3135 wr_reg32(info, IOER, 0); 3136 spin_unlock_irqrestore(&info->port_array[0]->lock, flags); 3137 3138 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio))) 3139 rc = -EFAULT; 3140 return rc; 3141} 3142 3143static int modem_input_wait(struct slgt_info *info,int arg) 3144{ 3145 unsigned long flags; 3146 int rc; 3147 struct mgsl_icount cprev, cnow; 3148 DECLARE_WAITQUEUE(wait, current); 3149 3150 /* save current irq counts */ 3151 spin_lock_irqsave(&info->lock,flags); 3152 cprev = info->icount; 3153 add_wait_queue(&info->status_event_wait_q, &wait); 3154 set_current_state(TASK_INTERRUPTIBLE); 3155 spin_unlock_irqrestore(&info->lock,flags); 3156 3157 for(;;) { 3158 schedule(); 3159 if (signal_pending(current)) { 3160 rc = -ERESTARTSYS; 3161 break; 3162 } 3163 3164 /* get new irq counts */ 3165 spin_lock_irqsave(&info->lock,flags); 3166 cnow = info->icount; 3167 set_current_state(TASK_INTERRUPTIBLE); 3168 spin_unlock_irqrestore(&info->lock,flags); 3169 3170 /* if no change, wait aborted for some reason */ 3171 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 3172 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 3173 rc = -EIO; 3174 break; 3175 } 3176 3177 /* check for change in caller specified modem input */ 3178 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) || 3179 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) || 3180 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) || 3181 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) { 3182 rc = 0; 3183 break; 3184 } 3185 3186 cprev = cnow; 3187 } 3188 remove_wait_queue(&info->status_event_wait_q, &wait); 3189 set_current_state(TASK_RUNNING); 3190 return rc; 3191} 3192 3193/* 3194 * return state of serial control and status signals 3195 */ 3196static int tiocmget(struct tty_struct *tty) 3197{ 3198 struct slgt_info *info = tty->driver_data; 3199 unsigned int result; 3200 unsigned long flags; 3201 3202 spin_lock_irqsave(&info->lock,flags); 3203 get_signals(info); 3204 spin_unlock_irqrestore(&info->lock,flags); 3205 3206 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) + 3207 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) + 3208 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) + 3209 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) + 3210 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) + 3211 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0); 3212 3213 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result)); 3214 return result; 3215} 3216 3217/* 3218 * set modem control signals (DTR/RTS) 3219 * 3220 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit 3221 * TIOCMSET = set/clear signal values 3222 * value bit mask for command 3223 */ 3224static int tiocmset(struct tty_struct *tty, 3225 unsigned int set, unsigned int clear) 3226{ 3227 struct slgt_info *info = tty->driver_data; 3228 unsigned long flags; 3229 3230 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear)); 3231 3232 if (set & TIOCM_RTS) 3233 info->signals |= SerialSignal_RTS; 3234 if (set & TIOCM_DTR) 3235 info->signals |= SerialSignal_DTR; 3236 if (clear & TIOCM_RTS) 3237 info->signals &= ~SerialSignal_RTS; 3238 if (clear & TIOCM_DTR) 3239 info->signals &= ~SerialSignal_DTR; 3240 3241 spin_lock_irqsave(&info->lock,flags); 3242 set_signals(info); 3243 spin_unlock_irqrestore(&info->lock,flags); 3244 return 0; 3245} 3246 3247static int carrier_raised(struct tty_port *port) 3248{ 3249 unsigned long flags; 3250 struct slgt_info *info = container_of(port, struct slgt_info, port); 3251 3252 spin_lock_irqsave(&info->lock,flags); 3253 get_signals(info); 3254 spin_unlock_irqrestore(&info->lock,flags); 3255 return (info->signals & SerialSignal_DCD) ? 1 : 0; 3256} 3257 3258static void dtr_rts(struct tty_port *port, int on) 3259{ 3260 unsigned long flags; 3261 struct slgt_info *info = container_of(port, struct slgt_info, port); 3262 3263 spin_lock_irqsave(&info->lock,flags); 3264 if (on) 3265 info->signals |= SerialSignal_RTS + SerialSignal_DTR; 3266 else 3267 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); 3268 set_signals(info); 3269 spin_unlock_irqrestore(&info->lock,flags); 3270} 3271 3272 3273/* 3274 * block current process until the device is ready to open 3275 */ 3276static int block_til_ready(struct tty_struct *tty, struct file *filp, 3277 struct slgt_info *info) 3278{ 3279 DECLARE_WAITQUEUE(wait, current); 3280 int retval; 3281 bool do_clocal = false; 3282 bool extra_count = false; 3283 unsigned long flags; 3284 int cd; 3285 struct tty_port *port = &info->port; 3286 3287 DBGINFO(("%s block_til_ready\n", tty->driver->name)); 3288 3289 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ 3290 /* nonblock mode is set or port is not enabled */ 3291 port->flags |= ASYNC_NORMAL_ACTIVE; 3292 return 0; 3293 } 3294 3295 if (tty->termios.c_cflag & CLOCAL) 3296 do_clocal = true; 3297 3298 /* Wait for carrier detect and the line to become 3299 * free (i.e., not in use by the callout). While we are in 3300 * this loop, port->count is dropped by one, so that 3301 * close() knows when to free things. We restore it upon 3302 * exit, either normal or abnormal. 3303 */ 3304 3305 retval = 0; 3306 add_wait_queue(&port->open_wait, &wait); 3307 3308 spin_lock_irqsave(&info->lock, flags); 3309 if (!tty_hung_up_p(filp)) { 3310 extra_count = true; 3311 port->count--; 3312 } 3313 spin_unlock_irqrestore(&info->lock, flags); 3314 port->blocked_open++; 3315 3316 while (1) { 3317 if ((tty->termios.c_cflag & CBAUD)) 3318 tty_port_raise_dtr_rts(port); 3319 3320 set_current_state(TASK_INTERRUPTIBLE); 3321 3322 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){ 3323 retval = (port->flags & ASYNC_HUP_NOTIFY) ? 3324 -EAGAIN : -ERESTARTSYS; 3325 break; 3326 } 3327 3328 cd = tty_port_carrier_raised(port); 3329 3330 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd )) 3331 break; 3332 3333 if (signal_pending(current)) { 3334 retval = -ERESTARTSYS; 3335 break; 3336 } 3337 3338 DBGINFO(("%s block_til_ready wait\n", tty->driver->name)); 3339 tty_unlock(tty); 3340 schedule(); 3341 tty_lock(tty); 3342 } 3343 3344 set_current_state(TASK_RUNNING); 3345 remove_wait_queue(&port->open_wait, &wait); 3346 3347 if (extra_count) 3348 port->count++; 3349 port->blocked_open--; 3350 3351 if (!retval) 3352 port->flags |= ASYNC_NORMAL_ACTIVE; 3353 3354 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval)); 3355 return retval; 3356} 3357 3358static int alloc_tmp_rbuf(struct slgt_info *info) 3359{ 3360 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL); 3361 if (info->tmp_rbuf == NULL) 3362 return -ENOMEM; 3363 return 0; 3364} 3365 3366static void free_tmp_rbuf(struct slgt_info *info) 3367{ 3368 kfree(info->tmp_rbuf); 3369 info->tmp_rbuf = NULL; 3370} 3371 3372/* 3373 * allocate DMA descriptor lists. 3374 */ 3375static int alloc_desc(struct slgt_info *info) 3376{ 3377 unsigned int i; 3378 unsigned int pbufs; 3379 3380 /* allocate memory to hold descriptor lists */ 3381 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr); 3382 if (info->bufs == NULL) 3383 return -ENOMEM; 3384 3385 memset(info->bufs, 0, DESC_LIST_SIZE); 3386 3387 info->rbufs = (struct slgt_desc*)info->bufs; 3388 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count; 3389 3390 pbufs = (unsigned int)info->bufs_dma_addr; 3391 3392 /* 3393 * Build circular lists of descriptors 3394 */ 3395 3396 for (i=0; i < info->rbuf_count; i++) { 3397 /* physical address of this descriptor */ 3398 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc)); 3399 3400 /* physical address of next descriptor */ 3401 if (i == info->rbuf_count - 1) 3402 info->rbufs[i].next = cpu_to_le32(pbufs); 3403 else 3404 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc))); 3405 set_desc_count(info->rbufs[i], DMABUFSIZE); 3406 } 3407 3408 for (i=0; i < info->tbuf_count; i++) { 3409 /* physical address of this descriptor */ 3410 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc)); 3411 3412 /* physical address of next descriptor */ 3413 if (i == info->tbuf_count - 1) 3414 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc)); 3415 else 3416 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc))); 3417 } 3418 3419 return 0; 3420} 3421 3422static void free_desc(struct slgt_info *info) 3423{ 3424 if (info->bufs != NULL) { 3425 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr); 3426 info->bufs = NULL; 3427 info->rbufs = NULL; 3428 info->tbufs = NULL; 3429 } 3430} 3431 3432static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) 3433{ 3434 int i; 3435 for (i=0; i < count; i++) { 3436 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL) 3437 return -ENOMEM; 3438 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr); 3439 } 3440 return 0; 3441} 3442 3443static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) 3444{ 3445 int i; 3446 for (i=0; i < count; i++) { 3447 if (bufs[i].buf == NULL) 3448 continue; 3449 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr); 3450 bufs[i].buf = NULL; 3451 } 3452} 3453 3454static int alloc_dma_bufs(struct slgt_info *info) 3455{ 3456 info->rbuf_count = 32; 3457 info->tbuf_count = 32; 3458 3459 if (alloc_desc(info) < 0 || 3460 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 || 3461 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 || 3462 alloc_tmp_rbuf(info) < 0) { 3463 DBGERR(("%s DMA buffer alloc fail\n", info->device_name)); 3464 return -ENOMEM; 3465 } 3466 reset_rbufs(info); 3467 return 0; 3468} 3469 3470static void free_dma_bufs(struct slgt_info *info) 3471{ 3472 if (info->bufs) { 3473 free_bufs(info, info->rbufs, info->rbuf_count); 3474 free_bufs(info, info->tbufs, info->tbuf_count); 3475 free_desc(info); 3476 } 3477 free_tmp_rbuf(info); 3478} 3479 3480static int claim_resources(struct slgt_info *info) 3481{ 3482 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) { 3483 DBGERR(("%s reg addr conflict, addr=%08X\n", 3484 info->device_name, info->phys_reg_addr)); 3485 info->init_error = DiagStatus_AddressConflict; 3486 goto errout; 3487 } 3488 else 3489 info->reg_addr_requested = true; 3490 3491 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE); 3492 if (!info->reg_addr) { 3493 DBGERR(("%s can't map device registers, addr=%08X\n", 3494 info->device_name, info->phys_reg_addr)); 3495 info->init_error = DiagStatus_CantAssignPciResources; 3496 goto errout; 3497 } 3498 return 0; 3499 3500errout: 3501 release_resources(info); 3502 return -ENODEV; 3503} 3504 3505static void release_resources(struct slgt_info *info) 3506{ 3507 if (info->irq_requested) { 3508 free_irq(info->irq_level, info); 3509 info->irq_requested = false; 3510 } 3511 3512 if (info->reg_addr_requested) { 3513 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE); 3514 info->reg_addr_requested = false; 3515 } 3516 3517 if (info->reg_addr) { 3518 iounmap(info->reg_addr); 3519 info->reg_addr = NULL; 3520 } 3521} 3522 3523/* Add the specified device instance data structure to the 3524 * global linked list of devices and increment the device count. 3525 */ 3526static void add_device(struct slgt_info *info) 3527{ 3528 char *devstr; 3529 3530 info->next_device = NULL; 3531 info->line = slgt_device_count; 3532 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line); 3533 3534 if (info->line < MAX_DEVICES) { 3535 if (maxframe[info->line]) 3536 info->max_frame_size = maxframe[info->line]; 3537 } 3538 3539 slgt_device_count++; 3540 3541 if (!slgt_device_list) 3542 slgt_device_list = info; 3543 else { 3544 struct slgt_info *current_dev = slgt_device_list; 3545 while(current_dev->next_device) 3546 current_dev = current_dev->next_device; 3547 current_dev->next_device = info; 3548 } 3549 3550 if (info->max_frame_size < 4096) 3551 info->max_frame_size = 4096; 3552 else if (info->max_frame_size > 65535) 3553 info->max_frame_size = 65535; 3554 3555 switch(info->pdev->device) { 3556 case SYNCLINK_GT_DEVICE_ID: 3557 devstr = "GT"; 3558 break; 3559 case SYNCLINK_GT2_DEVICE_ID: 3560 devstr = "GT2"; 3561 break; 3562 case SYNCLINK_GT4_DEVICE_ID: 3563 devstr = "GT4"; 3564 break; 3565 case SYNCLINK_AC_DEVICE_ID: 3566 devstr = "AC"; 3567 info->params.mode = MGSL_MODE_ASYNC; 3568 break; 3569 default: 3570 devstr = "(unknown model)"; 3571 } 3572 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n", 3573 devstr, info->device_name, info->phys_reg_addr, 3574 info->irq_level, info->max_frame_size); 3575 3576#if SYNCLINK_GENERIC_HDLC 3577 hdlcdev_init(info); 3578#endif 3579} 3580 3581static const struct tty_port_operations slgt_port_ops = { 3582 .carrier_raised = carrier_raised, 3583 .dtr_rts = dtr_rts, 3584}; 3585 3586/* 3587 * allocate device instance structure, return NULL on failure 3588 */ 3589static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev) 3590{ 3591 struct slgt_info *info; 3592 3593 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL); 3594 3595 if (!info) { 3596 DBGERR(("%s device alloc failed adapter=%d port=%d\n", 3597 driver_name, adapter_num, port_num)); 3598 } else { 3599 tty_port_init(&info->port); 3600 info->port.ops = &slgt_port_ops; 3601 info->magic = MGSL_MAGIC; 3602 INIT_WORK(&info->task, bh_handler); 3603 info->max_frame_size = 4096; 3604 info->base_clock = 14745600; 3605 info->rbuf_fill_level = DMABUFSIZE; 3606 info->port.close_delay = 5*HZ/10; 3607 info->port.closing_wait = 30*HZ; 3608 init_waitqueue_head(&info->status_event_wait_q); 3609 init_waitqueue_head(&info->event_wait_q); 3610 spin_lock_init(&info->netlock); 3611 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS)); 3612 info->idle_mode = HDLC_TXIDLE_FLAGS; 3613 info->adapter_num = adapter_num; 3614 info->port_num = port_num; 3615 3616 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info); 3617 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info); 3618 3619 /* Copy configuration info to device instance data */ 3620 info->pdev = pdev; 3621 info->irq_level = pdev->irq; 3622 info->phys_reg_addr = pci_resource_start(pdev,0); 3623 3624 info->bus_type = MGSL_BUS_TYPE_PCI; 3625 info->irq_flags = IRQF_SHARED; 3626 3627 info->init_error = -1; /* assume error, set to 0 on successful init */ 3628 } 3629 3630 return info; 3631} 3632 3633static void device_init(int adapter_num, struct pci_dev *pdev) 3634{ 3635 struct slgt_info *port_array[SLGT_MAX_PORTS]; 3636 int i; 3637 int port_count = 1; 3638 3639 if (pdev->device == SYNCLINK_GT2_DEVICE_ID) 3640 port_count = 2; 3641 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID) 3642 port_count = 4; 3643 3644 /* allocate device instances for all ports */ 3645 for (i=0; i < port_count; ++i) { 3646 port_array[i] = alloc_dev(adapter_num, i, pdev); 3647 if (port_array[i] == NULL) { 3648 for (--i; i >= 0; --i) 3649 kfree(port_array[i]); 3650 return; 3651 } 3652 } 3653 3654 /* give copy of port_array to all ports and add to device list */ 3655 for (i=0; i < port_count; ++i) { 3656 memcpy(port_array[i]->port_array, port_array, sizeof(port_array)); 3657 add_device(port_array[i]); 3658 port_array[i]->port_count = port_count; 3659 spin_lock_init(&port_array[i]->lock); 3660 } 3661 3662 /* Allocate and claim adapter resources */ 3663 if (!claim_resources(port_array[0])) { 3664 3665 alloc_dma_bufs(port_array[0]); 3666 3667 /* copy resource information from first port to others */ 3668 for (i = 1; i < port_count; ++i) { 3669 port_array[i]->irq_level = port_array[0]->irq_level; 3670 port_array[i]->reg_addr = port_array[0]->reg_addr; 3671 alloc_dma_bufs(port_array[i]); 3672 } 3673 3674 if (request_irq(port_array[0]->irq_level, 3675 slgt_interrupt, 3676 port_array[0]->irq_flags, 3677 port_array[0]->device_name, 3678 port_array[0]) < 0) { 3679 DBGERR(("%s request_irq failed IRQ=%d\n", 3680 port_array[0]->device_name, 3681 port_array[0]->irq_level)); 3682 } else { 3683 port_array[0]->irq_requested = true; 3684 adapter_test(port_array[0]); 3685 for (i=1 ; i < port_count ; i++) { 3686 port_array[i]->init_error = port_array[0]->init_error; 3687 port_array[i]->gpio_present = port_array[0]->gpio_present; 3688 } 3689 } 3690 } 3691 3692 for (i=0; i < port_count; ++i) 3693 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev)); 3694} 3695 3696static int __devinit init_one(struct pci_dev *dev, 3697 const struct pci_device_id *ent) 3698{ 3699 if (pci_enable_device(dev)) { 3700 printk("error enabling pci device %p\n", dev); 3701 return -EIO; 3702 } 3703 pci_set_master(dev); 3704 device_init(slgt_device_count, dev); 3705 return 0; 3706} 3707 3708static void __devexit remove_one(struct pci_dev *dev) 3709{ 3710} 3711 3712static const struct tty_operations ops = { 3713 .open = open, 3714 .close = close, 3715 .write = write, 3716 .put_char = put_char, 3717 .flush_chars = flush_chars, 3718 .write_room = write_room, 3719 .chars_in_buffer = chars_in_buffer, 3720 .flush_buffer = flush_buffer, 3721 .ioctl = ioctl, 3722 .compat_ioctl = slgt_compat_ioctl, 3723 .throttle = throttle, 3724 .unthrottle = unthrottle, 3725 .send_xchar = send_xchar, 3726 .break_ctl = set_break, 3727 .wait_until_sent = wait_until_sent, 3728 .set_termios = set_termios, 3729 .stop = tx_hold, 3730 .start = tx_release, 3731 .hangup = hangup, 3732 .tiocmget = tiocmget, 3733 .tiocmset = tiocmset, 3734 .get_icount = get_icount, 3735 .proc_fops = &synclink_gt_proc_fops, 3736}; 3737 3738static void slgt_cleanup(void) 3739{ 3740 int rc; 3741 struct slgt_info *info; 3742 struct slgt_info *tmp; 3743 3744 printk(KERN_INFO "unload %s\n", driver_name); 3745 3746 if (serial_driver) { 3747 for (info=slgt_device_list ; info != NULL ; info=info->next_device) 3748 tty_unregister_device(serial_driver, info->line); 3749 if ((rc = tty_unregister_driver(serial_driver))) 3750 DBGERR(("tty_unregister_driver error=%d\n", rc)); 3751 put_tty_driver(serial_driver); 3752 } 3753 3754 /* reset devices */ 3755 info = slgt_device_list; 3756 while(info) { 3757 reset_port(info); 3758 info = info->next_device; 3759 } 3760 3761 /* release devices */ 3762 info = slgt_device_list; 3763 while(info) { 3764#if SYNCLINK_GENERIC_HDLC 3765 hdlcdev_exit(info); 3766#endif 3767 free_dma_bufs(info); 3768 free_tmp_rbuf(info); 3769 if (info->port_num == 0) 3770 release_resources(info); 3771 tmp = info; 3772 info = info->next_device; 3773 kfree(tmp); 3774 } 3775 3776 if (pci_registered) 3777 pci_unregister_driver(&pci_driver); 3778} 3779 3780/* 3781 * Driver initialization entry point. 3782 */ 3783static int __init slgt_init(void) 3784{ 3785 int rc; 3786 3787 printk(KERN_INFO "%s\n", driver_name); 3788 3789 serial_driver = alloc_tty_driver(MAX_DEVICES); 3790 if (!serial_driver) { 3791 printk("%s can't allocate tty driver\n", driver_name); 3792 return -ENOMEM; 3793 } 3794 3795 /* Initialize the tty_driver structure */ 3796 3797 serial_driver->driver_name = tty_driver_name; 3798 serial_driver->name = tty_dev_prefix; 3799 serial_driver->major = ttymajor; 3800 serial_driver->minor_start = 64; 3801 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 3802 serial_driver->subtype = SERIAL_TYPE_NORMAL; 3803 serial_driver->init_termios = tty_std_termios; 3804 serial_driver->init_termios.c_cflag = 3805 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 3806 serial_driver->init_termios.c_ispeed = 9600; 3807 serial_driver->init_termios.c_ospeed = 9600; 3808 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 3809 tty_set_operations(serial_driver, &ops); 3810 if ((rc = tty_register_driver(serial_driver)) < 0) { 3811 DBGERR(("%s can't register serial driver\n", driver_name)); 3812 put_tty_driver(serial_driver); 3813 serial_driver = NULL; 3814 goto error; 3815 } 3816 3817 printk(KERN_INFO "%s, tty major#%d\n", 3818 driver_name, serial_driver->major); 3819 3820 slgt_device_count = 0; 3821 if ((rc = pci_register_driver(&pci_driver)) < 0) { 3822 printk("%s pci_register_driver error=%d\n", driver_name, rc); 3823 goto error; 3824 } 3825 pci_registered = true; 3826 3827 if (!slgt_device_list) 3828 printk("%s no devices found\n",driver_name); 3829 3830 return 0; 3831 3832error: 3833 slgt_cleanup(); 3834 return rc; 3835} 3836 3837static void __exit slgt_exit(void) 3838{ 3839 slgt_cleanup(); 3840} 3841 3842module_init(slgt_init); 3843module_exit(slgt_exit); 3844 3845/* 3846 * register access routines 3847 */ 3848 3849#define CALC_REGADDR() \ 3850 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \ 3851 if (addr >= 0x80) \ 3852 reg_addr += (info->port_num) * 32; \ 3853 else if (addr >= 0x40) \ 3854 reg_addr += (info->port_num) * 16; 3855 3856static __u8 rd_reg8(struct slgt_info *info, unsigned int addr) 3857{ 3858 CALC_REGADDR(); 3859 return readb((void __iomem *)reg_addr); 3860} 3861 3862static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value) 3863{ 3864 CALC_REGADDR(); 3865 writeb(value, (void __iomem *)reg_addr); 3866} 3867 3868static __u16 rd_reg16(struct slgt_info *info, unsigned int addr) 3869{ 3870 CALC_REGADDR(); 3871 return readw((void __iomem *)reg_addr); 3872} 3873 3874static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value) 3875{ 3876 CALC_REGADDR(); 3877 writew(value, (void __iomem *)reg_addr); 3878} 3879 3880static __u32 rd_reg32(struct slgt_info *info, unsigned int addr) 3881{ 3882 CALC_REGADDR(); 3883 return readl((void __iomem *)reg_addr); 3884} 3885 3886static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value) 3887{ 3888 CALC_REGADDR(); 3889 writel(value, (void __iomem *)reg_addr); 3890} 3891 3892static void rdma_reset(struct slgt_info *info) 3893{ 3894 unsigned int i; 3895 3896 /* set reset bit */ 3897 wr_reg32(info, RDCSR, BIT1); 3898 3899 /* wait for enable bit cleared */ 3900 for(i=0 ; i < 1000 ; i++) 3901 if (!(rd_reg32(info, RDCSR) & BIT0)) 3902 break; 3903} 3904 3905static void tdma_reset(struct slgt_info *info) 3906{ 3907 unsigned int i; 3908 3909 /* set reset bit */ 3910 wr_reg32(info, TDCSR, BIT1); 3911 3912 /* wait for enable bit cleared */ 3913 for(i=0 ; i < 1000 ; i++) 3914 if (!(rd_reg32(info, TDCSR) & BIT0)) 3915 break; 3916} 3917 3918/* 3919 * enable internal loopback 3920 * TxCLK and RxCLK are generated from BRG 3921 * and TxD is looped back to RxD internally. 3922 */ 3923static void enable_loopback(struct slgt_info *info) 3924{ 3925 /* SCR (serial control) BIT2=loopback enable */ 3926 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2)); 3927 3928 if (info->params.mode != MGSL_MODE_ASYNC) { 3929 /* CCR (clock control) 3930 * 07..05 tx clock source (010 = BRG) 3931 * 04..02 rx clock source (010 = BRG) 3932 * 01 auxclk enable (0 = disable) 3933 * 00 BRG enable (1 = enable) 3934 * 3935 * 0100 1001 3936 */ 3937 wr_reg8(info, CCR, 0x49); 3938 3939 /* set speed if available, otherwise use default */ 3940 if (info->params.clock_speed) 3941 set_rate(info, info->params.clock_speed); 3942 else 3943 set_rate(info, 3686400); 3944 } 3945} 3946 3947/* 3948 * set baud rate generator to specified rate 3949 */ 3950static void set_rate(struct slgt_info *info, u32 rate) 3951{ 3952 unsigned int div; 3953 unsigned int osc = info->base_clock; 3954 3955 /* div = osc/rate - 1 3956 * 3957 * Round div up if osc/rate is not integer to 3958 * force to next slowest rate. 3959 */ 3960 3961 if (rate) { 3962 div = osc/rate; 3963 if (!(osc % rate) && div) 3964 div--; 3965 wr_reg16(info, BDR, (unsigned short)div); 3966 } 3967} 3968 3969static void rx_stop(struct slgt_info *info) 3970{ 3971 unsigned short val; 3972 3973 /* disable and reset receiver */ 3974 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ 3975 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ 3976 wr_reg16(info, RCR, val); /* clear reset bit */ 3977 3978 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE); 3979 3980 /* clear pending rx interrupts */ 3981 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER); 3982 3983 rdma_reset(info); 3984 3985 info->rx_enabled = false; 3986 info->rx_restart = false; 3987} 3988 3989static void rx_start(struct slgt_info *info) 3990{ 3991 unsigned short val; 3992 3993 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA); 3994 3995 /* clear pending rx overrun IRQ */ 3996 wr_reg16(info, SSR, IRQ_RXOVER); 3997 3998 /* reset and disable receiver */ 3999 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ 4000 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ 4001 wr_reg16(info, RCR, val); /* clear reset bit */ 4002 4003 rdma_reset(info); 4004 reset_rbufs(info); 4005 4006 if (info->rx_pio) { 4007 /* rx request when rx FIFO not empty */ 4008 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14)); 4009 slgt_irq_on(info, IRQ_RXDATA); 4010 if (info->params.mode == MGSL_MODE_ASYNC) { 4011 /* enable saving of rx status */ 4012 wr_reg32(info, RDCSR, BIT6); 4013 } 4014 } else { 4015 /* rx request when rx FIFO half full */ 4016 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14)); 4017 /* set 1st descriptor address */ 4018 wr_reg32(info, RDDAR, info->rbufs[0].pdesc); 4019 4020 if (info->params.mode != MGSL_MODE_ASYNC) { 4021 /* enable rx DMA and DMA interrupt */ 4022 wr_reg32(info, RDCSR, (BIT2 + BIT0)); 4023 } else { 4024 /* enable saving of rx status, rx DMA and DMA interrupt */ 4025 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0)); 4026 } 4027 } 4028 4029 slgt_irq_on(info, IRQ_RXOVER); 4030 4031 /* enable receiver */ 4032 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1)); 4033 4034 info->rx_restart = false; 4035 info->rx_enabled = true; 4036} 4037 4038static void tx_start(struct slgt_info *info) 4039{ 4040 if (!info->tx_enabled) { 4041 wr_reg16(info, TCR, 4042 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2)); 4043 info->tx_enabled = true; 4044 } 4045 4046 if (desc_count(info->tbufs[info->tbuf_start])) { 4047 info->drop_rts_on_tx_done = false; 4048 4049 if (info->params.mode != MGSL_MODE_ASYNC) { 4050 if (info->params.flags & HDLC_FLAG_AUTO_RTS) { 4051 get_signals(info); 4052 if (!(info->signals & SerialSignal_RTS)) { 4053 info->signals |= SerialSignal_RTS; 4054 set_signals(info); 4055 info->drop_rts_on_tx_done = true; 4056 } 4057 } 4058 4059 slgt_irq_off(info, IRQ_TXDATA); 4060 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE); 4061 /* clear tx idle and underrun status bits */ 4062 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); 4063 } else { 4064 slgt_irq_off(info, IRQ_TXDATA); 4065 slgt_irq_on(info, IRQ_TXIDLE); 4066 /* clear tx idle status bit */ 4067 wr_reg16(info, SSR, IRQ_TXIDLE); 4068 } 4069 /* set 1st descriptor address and start DMA */ 4070 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc); 4071 wr_reg32(info, TDCSR, BIT2 + BIT0); 4072 info->tx_active = true; 4073 } 4074} 4075 4076static void tx_stop(struct slgt_info *info) 4077{ 4078 unsigned short val; 4079 4080 del_timer(&info->tx_timer); 4081 4082 tdma_reset(info); 4083 4084 /* reset and disable transmitter */ 4085 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */ 4086 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ 4087 4088 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); 4089 4090 /* clear tx idle and underrun status bit */ 4091 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); 4092 4093 reset_tbufs(info); 4094 4095 info->tx_enabled = false; 4096 info->tx_active = false; 4097} 4098 4099static void reset_port(struct slgt_info *info) 4100{ 4101 if (!info->reg_addr) 4102 return; 4103 4104 tx_stop(info); 4105 rx_stop(info); 4106 4107 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS); 4108 set_signals(info); 4109 4110 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4111} 4112 4113static void reset_adapter(struct slgt_info *info) 4114{ 4115 int i; 4116 for (i=0; i < info->port_count; ++i) { 4117 if (info->port_array[i]) 4118 reset_port(info->port_array[i]); 4119 } 4120} 4121 4122static void async_mode(struct slgt_info *info) 4123{ 4124 unsigned short val; 4125 4126 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4127 tx_stop(info); 4128 rx_stop(info); 4129 4130 /* TCR (tx control) 4131 * 4132 * 15..13 mode, 010=async 4133 * 12..10 encoding, 000=NRZ 4134 * 09 parity enable 4135 * 08 1=odd parity, 0=even parity 4136 * 07 1=RTS driver control 4137 * 06 1=break enable 4138 * 05..04 character length 4139 * 00=5 bits 4140 * 01=6 bits 4141 * 10=7 bits 4142 * 11=8 bits 4143 * 03 0=1 stop bit, 1=2 stop bits 4144 * 02 reset 4145 * 01 enable 4146 * 00 auto-CTS enable 4147 */ 4148 val = 0x4000; 4149 4150 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 4151 val |= BIT7; 4152 4153 if (info->params.parity != ASYNC_PARITY_NONE) { 4154 val |= BIT9; 4155 if (info->params.parity == ASYNC_PARITY_ODD) 4156 val |= BIT8; 4157 } 4158 4159 switch (info->params.data_bits) 4160 { 4161 case 6: val |= BIT4; break; 4162 case 7: val |= BIT5; break; 4163 case 8: val |= BIT5 + BIT4; break; 4164 } 4165 4166 if (info->params.stop_bits != 1) 4167 val |= BIT3; 4168 4169 if (info->params.flags & HDLC_FLAG_AUTO_CTS) 4170 val |= BIT0; 4171 4172 wr_reg16(info, TCR, val); 4173 4174 /* RCR (rx control) 4175 * 4176 * 15..13 mode, 010=async 4177 * 12..10 encoding, 000=NRZ 4178 * 09 parity enable 4179 * 08 1=odd parity, 0=even parity 4180 * 07..06 reserved, must be 0 4181 * 05..04 character length 4182 * 00=5 bits 4183 * 01=6 bits 4184 * 10=7 bits 4185 * 11=8 bits 4186 * 03 reserved, must be zero 4187 * 02 reset 4188 * 01 enable 4189 * 00 auto-DCD enable 4190 */ 4191 val = 0x4000; 4192 4193 if (info->params.parity != ASYNC_PARITY_NONE) { 4194 val |= BIT9; 4195 if (info->params.parity == ASYNC_PARITY_ODD) 4196 val |= BIT8; 4197 } 4198 4199 switch (info->params.data_bits) 4200 { 4201 case 6: val |= BIT4; break; 4202 case 7: val |= BIT5; break; 4203 case 8: val |= BIT5 + BIT4; break; 4204 } 4205 4206 if (info->params.flags & HDLC_FLAG_AUTO_DCD) 4207 val |= BIT0; 4208 4209 wr_reg16(info, RCR, val); 4210 4211 /* CCR (clock control) 4212 * 4213 * 07..05 011 = tx clock source is BRG/16 4214 * 04..02 010 = rx clock source is BRG 4215 * 01 0 = auxclk disabled 4216 * 00 1 = BRG enabled 4217 * 4218 * 0110 1001 4219 */ 4220 wr_reg8(info, CCR, 0x69); 4221 4222 msc_set_vcr(info); 4223 4224 /* SCR (serial control) 4225 * 4226 * 15 1=tx req on FIFO half empty 4227 * 14 1=rx req on FIFO half full 4228 * 13 tx data IRQ enable 4229 * 12 tx idle IRQ enable 4230 * 11 rx break on IRQ enable 4231 * 10 rx data IRQ enable 4232 * 09 rx break off IRQ enable 4233 * 08 overrun IRQ enable 4234 * 07 DSR IRQ enable 4235 * 06 CTS IRQ enable 4236 * 05 DCD IRQ enable 4237 * 04 RI IRQ enable 4238 * 03 0=16x sampling, 1=8x sampling 4239 * 02 1=txd->rxd internal loopback enable 4240 * 01 reserved, must be zero 4241 * 00 1=master IRQ enable 4242 */ 4243 val = BIT15 + BIT14 + BIT0; 4244 /* JCR[8] : 1 = x8 async mode feature available */ 4245 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate && 4246 ((info->base_clock < (info->params.data_rate * 16)) || 4247 (info->base_clock % (info->params.data_rate * 16)))) { 4248 /* use 8x sampling */ 4249 val |= BIT3; 4250 set_rate(info, info->params.data_rate * 8); 4251 } else { 4252 /* use 16x sampling */ 4253 set_rate(info, info->params.data_rate * 16); 4254 } 4255 wr_reg16(info, SCR, val); 4256 4257 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER); 4258 4259 if (info->params.loopback) 4260 enable_loopback(info); 4261} 4262 4263static void sync_mode(struct slgt_info *info) 4264{ 4265 unsigned short val; 4266 4267 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); 4268 tx_stop(info); 4269 rx_stop(info); 4270 4271 /* TCR (tx control) 4272 * 4273 * 15..13 mode 4274 * 000=HDLC/SDLC 4275 * 001=raw bit synchronous 4276 * 010=asynchronous/isochronous 4277 * 011=monosync byte synchronous 4278 * 100=bisync byte synchronous 4279 * 101=xsync byte synchronous 4280 * 12..10 encoding 4281 * 09 CRC enable 4282 * 08 CRC32 4283 * 07 1=RTS driver control 4284 * 06 preamble enable 4285 * 05..04 preamble length 4286 * 03 share open/close flag 4287 * 02 reset 4288 * 01 enable 4289 * 00 auto-CTS enable 4290 */ 4291 val = BIT2; 4292 4293 switch(info->params.mode) { 4294 case MGSL_MODE_XSYNC: 4295 val |= BIT15 + BIT13; 4296 break; 4297 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; 4298 case MGSL_MODE_BISYNC: val |= BIT15; break; 4299 case MGSL_MODE_RAW: val |= BIT13; break; 4300 } 4301 if (info->if_mode & MGSL_INTERFACE_RTS_EN) 4302 val |= BIT7; 4303 4304 switch(info->params.encoding) 4305 { 4306 case HDLC_ENCODING_NRZB: val |= BIT10; break; 4307 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; 4308 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; 4309 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; 4310 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; 4311 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; 4312 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; 4313 } 4314 4315 switch (info->params.crc_type & HDLC_CRC_MASK) 4316 { 4317 case HDLC_CRC_16_CCITT: val |= BIT9; break; 4318 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; 4319 } 4320 4321 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE) 4322 val |= BIT6; 4323 4324 switch (info->params.preamble_length) 4325 { 4326 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break; 4327 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break; 4328 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break; 4329 } 4330 4331 if (info->params.flags & HDLC_FLAG_AUTO_CTS) 4332 val |= BIT0; 4333 4334 wr_reg16(info, TCR, val); 4335 4336 /* TPR (transmit preamble) */ 4337 4338 switch (info->params.preamble) 4339 { 4340 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break; 4341 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break; 4342 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break; 4343 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break; 4344 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break; 4345 default: val = 0x7e; break; 4346 } 4347 wr_reg8(info, TPR, (unsigned char)val); 4348 4349 /* RCR (rx control) 4350 * 4351 * 15..13 mode 4352 * 000=HDLC/SDLC 4353 * 001=raw bit synchronous 4354 * 010=asynchronous/isochronous 4355 * 011=monosync byte synchronous 4356 * 100=bisync byte synchronous 4357 * 101=xsync byte synchronous 4358 * 12..10 encoding 4359 * 09 CRC enable 4360 * 08 CRC32 4361 * 07..03 reserved, must be 0 4362 * 02 reset 4363 * 01 enable 4364 * 00 auto-DCD enable 4365 */ 4366 val = 0; 4367 4368 switch(info->params.mode) { 4369 case MGSL_MODE_XSYNC: 4370 val |= BIT15 + BIT13; 4371 break; 4372 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; 4373 case MGSL_MODE_BISYNC: val |= BIT15; break; 4374 case MGSL_MODE_RAW: val |= BIT13; break; 4375 } 4376 4377 switch(info->params.encoding) 4378 { 4379 case HDLC_ENCODING_NRZB: val |= BIT10; break; 4380 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; 4381 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; 4382 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; 4383 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; 4384 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; 4385 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; 4386 } 4387 4388 switch (info->params.crc_type & HDLC_CRC_MASK) 4389 { 4390 case HDLC_CRC_16_CCITT: val |= BIT9; break; 4391 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; 4392 } 4393 4394 if (info->params.flags & HDLC_FLAG_AUTO_DCD) 4395 val |= BIT0; 4396 4397 wr_reg16(info, RCR, val); 4398 4399 /* CCR (clock control) 4400 * 4401 * 07..05 tx clock source 4402 * 04..02 rx clock source 4403 * 01 auxclk enable 4404 * 00 BRG enable 4405 */ 4406 val = 0; 4407 4408 if (info->params.flags & HDLC_FLAG_TXC_BRG) 4409 { 4410 // when RxC source is DPLL, BRG generates 16X DPLL 4411 // reference clock, so take TxC from BRG/16 to get 4412 // transmit clock at actual data rate 4413 if (info->params.flags & HDLC_FLAG_RXC_DPLL) 4414 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */ 4415 else 4416 val |= BIT6; /* 010, txclk = BRG */ 4417 } 4418 else if (info->params.flags & HDLC_FLAG_TXC_DPLL) 4419 val |= BIT7; /* 100, txclk = DPLL Input */ 4420 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN) 4421 val |= BIT5; /* 001, txclk = RXC Input */ 4422 4423 if (info->params.flags & HDLC_FLAG_RXC_BRG) 4424 val |= BIT3; /* 010, rxclk = BRG */ 4425 else if (info->params.flags & HDLC_FLAG_RXC_DPLL) 4426 val |= BIT4; /* 100, rxclk = DPLL */ 4427 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN) 4428 val |= BIT2; /* 001, rxclk = TXC Input */ 4429 4430 if (info->params.clock_speed) 4431 val |= BIT1 + BIT0; 4432 4433 wr_reg8(info, CCR, (unsigned char)val); 4434 4435 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL)) 4436 { 4437 // program DPLL mode 4438 switch(info->params.encoding) 4439 { 4440 case HDLC_ENCODING_BIPHASE_MARK: 4441 case HDLC_ENCODING_BIPHASE_SPACE: 4442 val = BIT7; break; 4443 case HDLC_ENCODING_BIPHASE_LEVEL: 4444 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: 4445 val = BIT7 + BIT6; break; 4446 default: val = BIT6; // NRZ encodings 4447 } 4448 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val)); 4449 4450 // DPLL requires a 16X reference clock from BRG 4451 set_rate(info, info->params.clock_speed * 16); 4452 } 4453 else 4454 set_rate(info, info->params.clock_speed); 4455 4456 tx_set_idle(info); 4457 4458 msc_set_vcr(info); 4459 4460 /* SCR (serial control) 4461 * 4462 * 15 1=tx req on FIFO half empty 4463 * 14 1=rx req on FIFO half full 4464 * 13 tx data IRQ enable 4465 * 12 tx idle IRQ enable 4466 * 11 underrun IRQ enable 4467 * 10 rx data IRQ enable 4468 * 09 rx idle IRQ enable 4469 * 08 overrun IRQ enable 4470 * 07 DSR IRQ enable 4471 * 06 CTS IRQ enable 4472 * 05 DCD IRQ enable 4473 * 04 RI IRQ enable 4474 * 03 reserved, must be zero 4475 * 02 1=txd->rxd internal loopback enable 4476 * 01 reserved, must be zero 4477 * 00 1=master IRQ enable 4478 */ 4479 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0); 4480 4481 if (info->params.loopback) 4482 enable_loopback(info); 4483} 4484 4485/* 4486 * set transmit idle mode 4487 */ 4488static void tx_set_idle(struct slgt_info *info) 4489{ 4490 unsigned char val; 4491 unsigned short tcr; 4492 4493 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits 4494 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits 4495 */ 4496 tcr = rd_reg16(info, TCR); 4497 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) { 4498 /* disable preamble, set idle size to 16 bits */ 4499 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4; 4500 /* MSB of 16 bit idle specified in tx preamble register (TPR) */ 4501 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff)); 4502 } else if (!(tcr & BIT6)) { 4503 /* preamble is disabled, set idle size to 8 bits */ 4504 tcr &= ~(BIT5 + BIT4); 4505 } 4506 wr_reg16(info, TCR, tcr); 4507 4508 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) { 4509 /* LSB of custom tx idle specified in tx idle register */ 4510 val = (unsigned char)(info->idle_mode & 0xff); 4511 } else { 4512 /* standard 8 bit idle patterns */ 4513 switch(info->idle_mode) 4514 { 4515 case HDLC_TXIDLE_FLAGS: val = 0x7e; break; 4516 case HDLC_TXIDLE_ALT_ZEROS_ONES: 4517 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break; 4518 case HDLC_TXIDLE_ZEROS: 4519 case HDLC_TXIDLE_SPACE: val = 0x00; break; 4520 default: val = 0xff; 4521 } 4522 } 4523 4524 wr_reg8(info, TIR, val); 4525} 4526 4527/* 4528 * get state of V24 status (input) signals 4529 */ 4530static void get_signals(struct slgt_info *info) 4531{ 4532 unsigned short status = rd_reg16(info, SSR); 4533 4534 /* clear all serial signals except DTR and RTS */ 4535 info->signals &= SerialSignal_DTR + SerialSignal_RTS; 4536 4537 if (status & BIT3) 4538 info->signals |= SerialSignal_DSR; 4539 if (status & BIT2) 4540 info->signals |= SerialSignal_CTS; 4541 if (status & BIT1) 4542 info->signals |= SerialSignal_DCD; 4543 if (status & BIT0) 4544 info->signals |= SerialSignal_RI; 4545} 4546 4547/* 4548 * set V.24 Control Register based on current configuration 4549 */ 4550static void msc_set_vcr(struct slgt_info *info) 4551{ 4552 unsigned char val = 0; 4553 4554 /* VCR (V.24 control) 4555 * 4556 * 07..04 serial IF select 4557 * 03 DTR 4558 * 02 RTS 4559 * 01 LL 4560 * 00 RL 4561 */ 4562 4563 switch(info->if_mode & MGSL_INTERFACE_MASK) 4564 { 4565 case MGSL_INTERFACE_RS232: 4566 val |= BIT5; /* 0010 */ 4567 break; 4568 case MGSL_INTERFACE_V35: 4569 val |= BIT7 + BIT6 + BIT5; /* 1110 */ 4570 break; 4571 case MGSL_INTERFACE_RS422: 4572 val |= BIT6; /* 0100 */ 4573 break; 4574 } 4575 4576 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST) 4577 val |= BIT4; 4578 if (info->signals & SerialSignal_DTR) 4579 val |= BIT3; 4580 if (info->signals & SerialSignal_RTS) 4581 val |= BIT2; 4582 if (info->if_mode & MGSL_INTERFACE_LL) 4583 val |= BIT1; 4584 if (info->if_mode & MGSL_INTERFACE_RL) 4585 val |= BIT0; 4586 wr_reg8(info, VCR, val); 4587} 4588 4589/* 4590 * set state of V24 control (output) signals 4591 */ 4592static void set_signals(struct slgt_info *info) 4593{ 4594 unsigned char val = rd_reg8(info, VCR); 4595 if (info->signals & SerialSignal_DTR) 4596 val |= BIT3; 4597 else 4598 val &= ~BIT3; 4599 if (info->signals & SerialSignal_RTS) 4600 val |= BIT2; 4601 else 4602 val &= ~BIT2; 4603 wr_reg8(info, VCR, val); 4604} 4605 4606/* 4607 * free range of receive DMA buffers (i to last) 4608 */ 4609static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last) 4610{ 4611 int done = 0; 4612 4613 while(!done) { 4614 /* reset current buffer for reuse */ 4615 info->rbufs[i].status = 0; 4616 set_desc_count(info->rbufs[i], info->rbuf_fill_level); 4617 if (i == last) 4618 done = 1; 4619 if (++i == info->rbuf_count) 4620 i = 0; 4621 } 4622 info->rbuf_current = i; 4623} 4624 4625/* 4626 * mark all receive DMA buffers as free 4627 */ 4628static void reset_rbufs(struct slgt_info *info) 4629{ 4630 free_rbufs(info, 0, info->rbuf_count - 1); 4631 info->rbuf_fill_index = 0; 4632 info->rbuf_fill_count = 0; 4633} 4634 4635/* 4636 * pass receive HDLC frame to upper layer 4637 * 4638 * return true if frame available, otherwise false 4639 */ 4640static bool rx_get_frame(struct slgt_info *info) 4641{ 4642 unsigned int start, end; 4643 unsigned short status; 4644 unsigned int framesize = 0; 4645 unsigned long flags; 4646 struct tty_struct *tty = info->port.tty; 4647 unsigned char addr_field = 0xff; 4648 unsigned int crc_size = 0; 4649 4650 switch (info->params.crc_type & HDLC_CRC_MASK) { 4651 case HDLC_CRC_16_CCITT: crc_size = 2; break; 4652 case HDLC_CRC_32_CCITT: crc_size = 4; break; 4653 } 4654 4655check_again: 4656 4657 framesize = 0; 4658 addr_field = 0xff; 4659 start = end = info->rbuf_current; 4660 4661 for (;;) { 4662 if (!desc_complete(info->rbufs[end])) 4663 goto cleanup; 4664 4665 if (framesize == 0 && info->params.addr_filter != 0xff) 4666 addr_field = info->rbufs[end].buf[0]; 4667 4668 framesize += desc_count(info->rbufs[end]); 4669 4670 if (desc_eof(info->rbufs[end])) 4671 break; 4672 4673 if (++end == info->rbuf_count) 4674 end = 0; 4675 4676 if (end == info->rbuf_current) { 4677 if (info->rx_enabled){ 4678 spin_lock_irqsave(&info->lock,flags); 4679 rx_start(info); 4680 spin_unlock_irqrestore(&info->lock,flags); 4681 } 4682 goto cleanup; 4683 } 4684 } 4685 4686 /* status 4687 * 4688 * 15 buffer complete 4689 * 14..06 reserved 4690 * 05..04 residue 4691 * 02 eof (end of frame) 4692 * 01 CRC error 4693 * 00 abort 4694 */ 4695 status = desc_status(info->rbufs[end]); 4696 4697 /* ignore CRC bit if not using CRC (bit is undefined) */ 4698 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE) 4699 status &= ~BIT1; 4700 4701 if (framesize == 0 || 4702 (addr_field != 0xff && addr_field != info->params.addr_filter)) { 4703 free_rbufs(info, start, end); 4704 goto check_again; 4705 } 4706 4707 if (framesize < (2 + crc_size) || status & BIT0) { 4708 info->icount.rxshort++; 4709 framesize = 0; 4710 } else if (status & BIT1) { 4711 info->icount.rxcrc++; 4712 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) 4713 framesize = 0; 4714 } 4715 4716#if SYNCLINK_GENERIC_HDLC 4717 if (framesize == 0) { 4718 info->netdev->stats.rx_errors++; 4719 info->netdev->stats.rx_frame_errors++; 4720 } 4721#endif 4722 4723 DBGBH(("%s rx frame status=%04X size=%d\n", 4724 info->device_name, status, framesize)); 4725 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx"); 4726 4727 if (framesize) { 4728 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) { 4729 framesize -= crc_size; 4730 crc_size = 0; 4731 } 4732 4733 if (framesize > info->max_frame_size + crc_size) 4734 info->icount.rxlong++; 4735 else { 4736 /* copy dma buffer(s) to contiguous temp buffer */ 4737 int copy_count = framesize; 4738 int i = start; 4739 unsigned char *p = info->tmp_rbuf; 4740 info->tmp_rbuf_count = framesize; 4741 4742 info->icount.rxok++; 4743 4744 while(copy_count) { 4745 int partial_count = min_t(int, copy_count, info->rbuf_fill_level); 4746 memcpy(p, info->rbufs[i].buf, partial_count); 4747 p += partial_count; 4748 copy_count -= partial_count; 4749 if (++i == info->rbuf_count) 4750 i = 0; 4751 } 4752 4753 if (info->params.crc_type & HDLC_CRC_RETURN_EX) { 4754 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK; 4755 framesize++; 4756 } 4757 4758#if SYNCLINK_GENERIC_HDLC 4759 if (info->netcount) 4760 hdlcdev_rx(info,info->tmp_rbuf, framesize); 4761 else 4762#endif 4763 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize); 4764 } 4765 } 4766 free_rbufs(info, start, end); 4767 return true; 4768 4769cleanup: 4770 return false; 4771} 4772 4773/* 4774 * pass receive buffer (RAW synchronous mode) to tty layer 4775 * return true if buffer available, otherwise false 4776 */ 4777static bool rx_get_buf(struct slgt_info *info) 4778{ 4779 unsigned int i = info->rbuf_current; 4780 unsigned int count; 4781 4782 if (!desc_complete(info->rbufs[i])) 4783 return false; 4784 count = desc_count(info->rbufs[i]); 4785 switch(info->params.mode) { 4786 case MGSL_MODE_MONOSYNC: 4787 case MGSL_MODE_BISYNC: 4788 case MGSL_MODE_XSYNC: 4789 /* ignore residue in byte synchronous modes */ 4790 if (desc_residue(info->rbufs[i])) 4791 count--; 4792 break; 4793 } 4794 DBGDATA(info, info->rbufs[i].buf, count, "rx"); 4795 DBGINFO(("rx_get_buf size=%d\n", count)); 4796 if (count) 4797 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf, 4798 info->flag_buf, count); 4799 free_rbufs(info, i, i); 4800 return true; 4801} 4802 4803static void reset_tbufs(struct slgt_info *info) 4804{ 4805 unsigned int i; 4806 info->tbuf_current = 0; 4807 for (i=0 ; i < info->tbuf_count ; i++) { 4808 info->tbufs[i].status = 0; 4809 info->tbufs[i].count = 0; 4810 } 4811} 4812 4813/* 4814 * return number of free transmit DMA buffers 4815 */ 4816static unsigned int free_tbuf_count(struct slgt_info *info) 4817{ 4818 unsigned int count = 0; 4819 unsigned int i = info->tbuf_current; 4820 4821 do 4822 { 4823 if (desc_count(info->tbufs[i])) 4824 break; /* buffer in use */ 4825 ++count; 4826 if (++i == info->tbuf_count) 4827 i=0; 4828 } while (i != info->tbuf_current); 4829 4830 /* if tx DMA active, last zero count buffer is in use */ 4831 if (count && (rd_reg32(info, TDCSR) & BIT0)) 4832 --count; 4833 4834 return count; 4835} 4836 4837/* 4838 * return number of bytes in unsent transmit DMA buffers 4839 * and the serial controller tx FIFO 4840 */ 4841static unsigned int tbuf_bytes(struct slgt_info *info) 4842{ 4843 unsigned int total_count = 0; 4844 unsigned int i = info->tbuf_current; 4845 unsigned int reg_value; 4846 unsigned int count; 4847 unsigned int active_buf_count = 0; 4848 4849 /* 4850 * Add descriptor counts for all tx DMA buffers. 4851 * If count is zero (cleared by DMA controller after read), 4852 * the buffer is complete or is actively being read from. 4853 * 4854 * Record buf_count of last buffer with zero count starting 4855 * from current ring position. buf_count is mirror 4856 * copy of count and is not cleared by serial controller. 4857 * If DMA controller is active, that buffer is actively 4858 * being read so add to total. 4859 */ 4860 do { 4861 count = desc_count(info->tbufs[i]); 4862 if (count) 4863 total_count += count; 4864 else if (!total_count) 4865 active_buf_count = info->tbufs[i].buf_count; 4866 if (++i == info->tbuf_count) 4867 i = 0; 4868 } while (i != info->tbuf_current); 4869 4870 /* read tx DMA status register */ 4871 reg_value = rd_reg32(info, TDCSR); 4872 4873 /* if tx DMA active, last zero count buffer is in use */ 4874 if (reg_value & BIT0) 4875 total_count += active_buf_count; 4876 4877 /* add tx FIFO count = reg_value[15..8] */ 4878 total_count += (reg_value >> 8) & 0xff; 4879 4880 /* if transmitter active add one byte for shift register */ 4881 if (info->tx_active) 4882 total_count++; 4883 4884 return total_count; 4885} 4886 4887/* 4888 * load data into transmit DMA buffer ring and start transmitter if needed 4889 * return true if data accepted, otherwise false (buffers full) 4890 */ 4891static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size) 4892{ 4893 unsigned short count; 4894 unsigned int i; 4895 struct slgt_desc *d; 4896 4897 /* check required buffer space */ 4898 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info)) 4899 return false; 4900 4901 DBGDATA(info, buf, size, "tx"); 4902 4903 /* 4904 * copy data to one or more DMA buffers in circular ring 4905 * tbuf_start = first buffer for this data 4906 * tbuf_current = next free buffer 4907 * 4908 * Copy all data before making data visible to DMA controller by 4909 * setting descriptor count of the first buffer. 4910 * This prevents an active DMA controller from reading the first DMA 4911 * buffers of a frame and stopping before the final buffers are filled. 4912 */ 4913 4914 info->tbuf_start = i = info->tbuf_current; 4915 4916 while (size) { 4917 d = &info->tbufs[i]; 4918 4919 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size); 4920 memcpy(d->buf, buf, count); 4921 4922 size -= count; 4923 buf += count; 4924 4925 /* 4926 * set EOF bit for last buffer of HDLC frame or 4927 * for every buffer in raw mode 4928 */ 4929 if ((!size && info->params.mode == MGSL_MODE_HDLC) || 4930 info->params.mode == MGSL_MODE_RAW) 4931 set_desc_eof(*d, 1); 4932 else 4933 set_desc_eof(*d, 0); 4934 4935 /* set descriptor count for all but first buffer */ 4936 if (i != info->tbuf_start) 4937 set_desc_count(*d, count); 4938 d->buf_count = count; 4939 4940 if (++i == info->tbuf_count) 4941 i = 0; 4942 } 4943 4944 info->tbuf_current = i; 4945 4946 /* set first buffer count to make new data visible to DMA controller */ 4947 d = &info->tbufs[info->tbuf_start]; 4948 set_desc_count(*d, d->buf_count); 4949 4950 /* start transmitter if needed and update transmit timeout */ 4951 if (!info->tx_active) 4952 tx_start(info); 4953 update_tx_timer(info); 4954 4955 return true; 4956} 4957 4958static int register_test(struct slgt_info *info) 4959{ 4960 static unsigned short patterns[] = 4961 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696}; 4962 static unsigned int count = ARRAY_SIZE(patterns); 4963 unsigned int i; 4964 int rc = 0; 4965 4966 for (i=0 ; i < count ; i++) { 4967 wr_reg16(info, TIR, patterns[i]); 4968 wr_reg16(info, BDR, patterns[(i+1)%count]); 4969 if ((rd_reg16(info, TIR) != patterns[i]) || 4970 (rd_reg16(info, BDR) != patterns[(i+1)%count])) { 4971 rc = -ENODEV; 4972 break; 4973 } 4974 } 4975 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0; 4976 info->init_error = rc ? 0 : DiagStatus_AddressFailure; 4977 return rc; 4978} 4979 4980static int irq_test(struct slgt_info *info) 4981{ 4982 unsigned long timeout; 4983 unsigned long flags; 4984 struct tty_struct *oldtty = info->port.tty; 4985 u32 speed = info->params.data_rate; 4986 4987 info->params.data_rate = 921600; 4988 info->port.tty = NULL; 4989 4990 spin_lock_irqsave(&info->lock, flags); 4991 async_mode(info); 4992 slgt_irq_on(info, IRQ_TXIDLE); 4993 4994 /* enable transmitter */ 4995 wr_reg16(info, TCR, 4996 (unsigned short)(rd_reg16(info, TCR) | BIT1)); 4997 4998 /* write one byte and wait for tx idle */ 4999 wr_reg16(info, TDR, 0); 5000 5001 /* assume failure */ 5002 info->init_error = DiagStatus_IrqFailure; 5003 info->irq_occurred = false; 5004 5005 spin_unlock_irqrestore(&info->lock, flags); 5006 5007 timeout=100; 5008 while(timeout-- && !info->irq_occurred) 5009 msleep_interruptible(10); 5010 5011 spin_lock_irqsave(&info->lock,flags); 5012 reset_port(info); 5013 spin_unlock_irqrestore(&info->lock,flags); 5014 5015 info->params.data_rate = speed; 5016 info->port.tty = oldtty; 5017 5018 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure; 5019 return info->irq_occurred ? 0 : -ENODEV; 5020} 5021 5022static int loopback_test_rx(struct slgt_info *info) 5023{ 5024 unsigned char *src, *dest; 5025 int count; 5026 5027 if (desc_complete(info->rbufs[0])) { 5028 count = desc_count(info->rbufs[0]); 5029 src = info->rbufs[0].buf; 5030 dest = info->tmp_rbuf; 5031 5032 for( ; count ; count-=2, src+=2) { 5033 /* src=data byte (src+1)=status byte */ 5034 if (!(*(src+1) & (BIT9 + BIT8))) { 5035 *dest = *src; 5036 dest++; 5037 info->tmp_rbuf_count++; 5038 } 5039 } 5040 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx"); 5041 return 1; 5042 } 5043 return 0; 5044} 5045 5046static int loopback_test(struct slgt_info *info) 5047{ 5048#define TESTFRAMESIZE 20 5049 5050 unsigned long timeout; 5051 u16 count = TESTFRAMESIZE; 5052 unsigned char buf[TESTFRAMESIZE]; 5053 int rc = -ENODEV; 5054 unsigned long flags; 5055 5056 struct tty_struct *oldtty = info->port.tty; 5057 MGSL_PARAMS params; 5058 5059 memcpy(¶ms, &info->params, sizeof(params)); 5060 5061 info->params.mode = MGSL_MODE_ASYNC; 5062 info->params.data_rate = 921600; 5063 info->params.loopback = 1; 5064 info->port.tty = NULL; 5065 5066 /* build and send transmit frame */ 5067 for (count = 0; count < TESTFRAMESIZE; ++count) 5068 buf[count] = (unsigned char)count; 5069 5070 info->tmp_rbuf_count = 0; 5071 memset(info->tmp_rbuf, 0, TESTFRAMESIZE); 5072 5073 /* program hardware for HDLC and enabled receiver */ 5074 spin_lock_irqsave(&info->lock,flags); 5075 async_mode(info); 5076 rx_start(info); 5077 tx_load(info, buf, count); 5078 spin_unlock_irqrestore(&info->lock, flags); 5079 5080 /* wait for receive complete */ 5081 for (timeout = 100; timeout; --timeout) { 5082 msleep_interruptible(10); 5083 if (loopback_test_rx(info)) { 5084 rc = 0; 5085 break; 5086 } 5087 } 5088 5089 /* verify received frame length and contents */ 5090 if (!rc && (info->tmp_rbuf_count != count || 5091 memcmp(buf, info->tmp_rbuf, count))) { 5092 rc = -ENODEV; 5093 } 5094 5095 spin_lock_irqsave(&info->lock,flags); 5096 reset_adapter(info); 5097 spin_unlock_irqrestore(&info->lock,flags); 5098 5099 memcpy(&info->params, ¶ms, sizeof(info->params)); 5100 info->port.tty = oldtty; 5101 5102 info->init_error = rc ? DiagStatus_DmaFailure : 0; 5103 return rc; 5104} 5105 5106static int adapter_test(struct slgt_info *info) 5107{ 5108 DBGINFO(("testing %s\n", info->device_name)); 5109 if (register_test(info) < 0) { 5110 printk("register test failure %s addr=%08X\n", 5111 info->device_name, info->phys_reg_addr); 5112 } else if (irq_test(info) < 0) { 5113 printk("IRQ test failure %s IRQ=%d\n", 5114 info->device_name, info->irq_level); 5115 } else if (loopback_test(info) < 0) { 5116 printk("loopback test failure %s\n", info->device_name); 5117 } 5118 return info->init_error; 5119} 5120 5121/* 5122 * transmit timeout handler 5123 */ 5124static void tx_timeout(unsigned long context) 5125{ 5126 struct slgt_info *info = (struct slgt_info*)context; 5127 unsigned long flags; 5128 5129 DBGINFO(("%s tx_timeout\n", info->device_name)); 5130 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) { 5131 info->icount.txtimeout++; 5132 } 5133 spin_lock_irqsave(&info->lock,flags); 5134 tx_stop(info); 5135 spin_unlock_irqrestore(&info->lock,flags); 5136 5137#if SYNCLINK_GENERIC_HDLC 5138 if (info->netcount) 5139 hdlcdev_tx_done(info); 5140 else 5141#endif 5142 bh_transmit(info); 5143} 5144 5145/* 5146 * receive buffer polling timer 5147 */ 5148static void rx_timeout(unsigned long context) 5149{ 5150 struct slgt_info *info = (struct slgt_info*)context; 5151 unsigned long flags; 5152 5153 DBGINFO(("%s rx_timeout\n", info->device_name)); 5154 spin_lock_irqsave(&info->lock, flags); 5155 info->pending_bh |= BH_RECEIVE; 5156 spin_unlock_irqrestore(&info->lock, flags); 5157 bh_handler(&info->task); 5158} 5159 5160