cosa.c revision 9cbe50d4231773396f529f51a048770d0ee54ac1
1/* $Id: cosa.c,v 1.31 2000/03/08 17:47:16 kas Exp $ */ 2 3/* 4 * Copyright (C) 1995-1997 Jan "Yenya" Kasprzak <kas@fi.muni.cz> 5 * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22/* 23 * The driver for the SRP and COSA synchronous serial cards. 24 * 25 * HARDWARE INFO 26 * 27 * Both cards are developed at the Institute of Computer Science, 28 * Masaryk University (http://www.ics.muni.cz/). The hardware is 29 * developed by Jiri Novotny <novotny@ics.muni.cz>. More information 30 * and the photo of both cards is available at 31 * http://www.pavoucek.cz/cosa.html. The card documentation, firmwares 32 * and other goods can be downloaded from ftp://ftp.ics.muni.cz/pub/cosa/. 33 * For Linux-specific utilities, see below in the "Software info" section. 34 * If you want to order the card, contact Jiri Novotny. 35 * 36 * The SRP (serial port?, the Czech word "srp" means "sickle") card 37 * is a 2-port intelligent (with its own 8-bit CPU) synchronous serial card 38 * with V.24 interfaces up to 80kb/s each. 39 * 40 * The COSA (communication serial adapter?, the Czech word "kosa" means 41 * "scythe") is a next-generation sync/async board with two interfaces 42 * - currently any of V.24, X.21, V.35 and V.36 can be selected. 43 * It has a 16-bit SAB80166 CPU and can do up to 10 Mb/s per channel. 44 * The 8-channels version is in development. 45 * 46 * Both types have downloadable firmware and communicate via ISA DMA. 47 * COSA can be also a bus-mastering device. 48 * 49 * SOFTWARE INFO 50 * 51 * The homepage of the Linux driver is at http://www.fi.muni.cz/~kas/cosa/. 52 * The CVS tree of Linux driver can be viewed there, as well as the 53 * firmware binaries and user-space utilities for downloading the firmware 54 * into the card and setting up the card. 55 * 56 * The Linux driver (unlike the present *BSD drivers :-) can work even 57 * for the COSA and SRP in one computer and allows each channel to work 58 * in one of the two modes (character or network device). 59 * 60 * AUTHOR 61 * 62 * The Linux driver was written by Jan "Yenya" Kasprzak <kas@fi.muni.cz>. 63 * 64 * You can mail me bugfixes and even success reports. I am especially 65 * interested in the SMP and/or muliti-channel success/failure reports 66 * (I wonder if I did the locking properly :-). 67 * 68 * THE AUTHOR USED THE FOLLOWING SOURCES WHEN PROGRAMMING THE DRIVER 69 * 70 * The COSA/SRP NetBSD driver by Zdenek Salvet and Ivos Cernohlavek 71 * The skeleton.c by Donald Becker 72 * The SDL Riscom/N2 driver by Mike Natale 73 * The Comtrol Hostess SV11 driver by Alan Cox 74 * The Sync PPP/Cisco HDLC layer (syncppp.c) ported to Linux by Alan Cox 75 */ 76 77#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 78 79#include <linux/module.h> 80#include <linux/kernel.h> 81#include <linux/sched.h> 82#include <linux/slab.h> 83#include <linux/poll.h> 84#include <linux/fs.h> 85#include <linux/interrupt.h> 86#include <linux/delay.h> 87#include <linux/hdlc.h> 88#include <linux/errno.h> 89#include <linux/ioport.h> 90#include <linux/netdevice.h> 91#include <linux/spinlock.h> 92#include <linux/mutex.h> 93#include <linux/device.h> 94#include <asm/io.h> 95#include <asm/dma.h> 96#include <asm/byteorder.h> 97 98#undef COSA_SLOW_IO /* for testing purposes only */ 99 100#include "cosa.h" 101 102/* Maximum length of the identification string. */ 103#define COSA_MAX_ID_STRING 128 104 105/* Maximum length of the channel name */ 106#define COSA_MAX_NAME (sizeof("cosaXXXcXXX")+1) 107 108/* Per-channel data structure */ 109 110struct channel_data { 111 int usage; /* Usage count; >0 for chrdev, -1 for netdev */ 112 int num; /* Number of the channel */ 113 struct cosa_data *cosa; /* Pointer to the per-card structure */ 114 int txsize; /* Size of transmitted data */ 115 char *txbuf; /* Transmit buffer */ 116 char name[COSA_MAX_NAME]; /* channel name */ 117 118 /* The HW layer interface */ 119 /* routine called from the RX interrupt */ 120 char *(*setup_rx)(struct channel_data *channel, int size); 121 /* routine called when the RX is done (from the EOT interrupt) */ 122 int (*rx_done)(struct channel_data *channel); 123 /* routine called when the TX is done (from the EOT interrupt) */ 124 int (*tx_done)(struct channel_data *channel, int size); 125 126 /* Character device parts */ 127 struct mutex rlock; 128 struct semaphore wsem; 129 char *rxdata; 130 int rxsize; 131 wait_queue_head_t txwaitq, rxwaitq; 132 int tx_status, rx_status; 133 134 /* generic HDLC device parts */ 135 struct net_device *netdev; 136 struct sk_buff *rx_skb, *tx_skb; 137}; 138 139/* cosa->firmware_status bits */ 140#define COSA_FW_RESET (1<<0) /* Is the ROM monitor active? */ 141#define COSA_FW_DOWNLOAD (1<<1) /* Is the microcode downloaded? */ 142#define COSA_FW_START (1<<2) /* Is the microcode running? */ 143 144struct cosa_data { 145 int num; /* Card number */ 146 char name[COSA_MAX_NAME]; /* Card name - e.g "cosa0" */ 147 unsigned int datareg, statusreg; /* I/O ports */ 148 unsigned short irq, dma; /* IRQ and DMA number */ 149 unsigned short startaddr; /* Firmware start address */ 150 unsigned short busmaster; /* Use busmastering? */ 151 int nchannels; /* # of channels on this card */ 152 int driver_status; /* For communicating with firmware */ 153 int firmware_status; /* Downloaded, reseted, etc. */ 154 unsigned long rxbitmap, txbitmap;/* Bitmap of channels who are willing to send/receive data */ 155 unsigned long rxtx; /* RX or TX in progress? */ 156 int enabled; 157 int usage; /* usage count */ 158 int txchan, txsize, rxsize; 159 struct channel_data *rxchan; 160 char *bouncebuf; 161 char *txbuf, *rxbuf; 162 struct channel_data *chan; 163 spinlock_t lock; /* For exclusive operations on this structure */ 164 char id_string[COSA_MAX_ID_STRING]; /* ROM monitor ID string */ 165 char *type; /* card type */ 166}; 167 168/* 169 * Define this if you want all the possible ports to be autoprobed. 170 * It is here but it probably is not a good idea to use this. 171 */ 172/* #define COSA_ISA_AUTOPROBE 1 */ 173 174/* 175 * Character device major number. 117 was allocated for us. 176 * The value of 0 means to allocate a first free one. 177 */ 178static DEFINE_MUTEX(cosa_chardev_mutex); 179static int cosa_major = 117; 180 181/* 182 * Encoding of the minor numbers: 183 * The lowest CARD_MINOR_BITS bits means the channel on the single card, 184 * the highest bits means the card number. 185 */ 186#define CARD_MINOR_BITS 4 /* How many bits in minor number are reserved 187 * for the single card */ 188/* 189 * The following depends on CARD_MINOR_BITS. Unfortunately, the "MODULE_STRING" 190 * macro doesn't like anything other than the raw number as an argument :-( 191 */ 192#define MAX_CARDS 16 193/* #define MAX_CARDS (1 << (8-CARD_MINOR_BITS)) */ 194 195#define DRIVER_RX_READY 0x0001 196#define DRIVER_TX_READY 0x0002 197#define DRIVER_TXMAP_SHIFT 2 198#define DRIVER_TXMAP_MASK 0x0c /* FIXME: 0xfc for 8-channel version */ 199 200/* 201 * for cosa->rxtx - indicates whether either transmit or receive is 202 * in progress. These values are mean number of the bit. 203 */ 204#define TXBIT 0 205#define RXBIT 1 206#define IRQBIT 2 207 208#define COSA_MTU 2000 /* FIXME: I don't know this exactly */ 209 210#undef DEBUG_DATA //1 /* Dump the data read or written to the channel */ 211#undef DEBUG_IRQS //1 /* Print the message when the IRQ is received */ 212#undef DEBUG_IO //1 /* Dump the I/O traffic */ 213 214#define TX_TIMEOUT (5*HZ) 215 216/* Maybe the following should be allocated dynamically */ 217static struct cosa_data cosa_cards[MAX_CARDS]; 218static int nr_cards; 219 220#ifdef COSA_ISA_AUTOPROBE 221static int io[MAX_CARDS+1] = { 0x220, 0x228, 0x210, 0x218, 0, }; 222/* NOTE: DMA is not autoprobed!!! */ 223static int dma[MAX_CARDS+1] = { 1, 7, 1, 7, 1, 7, 1, 7, 0, }; 224#else 225static int io[MAX_CARDS+1]; 226static int dma[MAX_CARDS+1]; 227#endif 228/* IRQ can be safely autoprobed */ 229static int irq[MAX_CARDS+1] = { -1, -1, -1, -1, -1, -1, 0, }; 230 231/* for class stuff*/ 232static struct class *cosa_class; 233 234#ifdef MODULE 235module_param_array(io, int, NULL, 0); 236MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards"); 237module_param_array(irq, int, NULL, 0); 238MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards"); 239module_param_array(dma, int, NULL, 0); 240MODULE_PARM_DESC(dma, "The DMA channels of the COSA or SRP cards"); 241 242MODULE_AUTHOR("Jan \"Yenya\" Kasprzak, <kas@fi.muni.cz>"); 243MODULE_DESCRIPTION("Modular driver for the COSA or SRP synchronous card"); 244MODULE_LICENSE("GPL"); 245#endif 246 247/* I use this mainly for testing purposes */ 248#ifdef COSA_SLOW_IO 249#define cosa_outb outb_p 250#define cosa_outw outw_p 251#define cosa_inb inb_p 252#define cosa_inw inw_p 253#else 254#define cosa_outb outb 255#define cosa_outw outw 256#define cosa_inb inb 257#define cosa_inw inw 258#endif 259 260#define is_8bit(cosa) (!(cosa->datareg & 0x08)) 261 262#define cosa_getstatus(cosa) (cosa_inb(cosa->statusreg)) 263#define cosa_putstatus(cosa, stat) (cosa_outb(stat, cosa->statusreg)) 264#define cosa_getdata16(cosa) (cosa_inw(cosa->datareg)) 265#define cosa_getdata8(cosa) (cosa_inb(cosa->datareg)) 266#define cosa_putdata16(cosa, dt) (cosa_outw(dt, cosa->datareg)) 267#define cosa_putdata8(cosa, dt) (cosa_outb(dt, cosa->datareg)) 268 269/* Initialization stuff */ 270static int cosa_probe(int ioaddr, int irq, int dma); 271 272/* HW interface */ 273static void cosa_enable_rx(struct channel_data *chan); 274static void cosa_disable_rx(struct channel_data *chan); 275static int cosa_start_tx(struct channel_data *channel, char *buf, int size); 276static void cosa_kick(struct cosa_data *cosa); 277static int cosa_dma_able(struct channel_data *chan, char *buf, int data); 278 279/* Network device stuff */ 280static int cosa_net_attach(struct net_device *dev, unsigned short encoding, 281 unsigned short parity); 282static int cosa_net_open(struct net_device *d); 283static int cosa_net_close(struct net_device *d); 284static void cosa_net_timeout(struct net_device *d); 285static netdev_tx_t cosa_net_tx(struct sk_buff *skb, struct net_device *d); 286static char *cosa_net_setup_rx(struct channel_data *channel, int size); 287static int cosa_net_rx_done(struct channel_data *channel); 288static int cosa_net_tx_done(struct channel_data *channel, int size); 289static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); 290 291/* Character device */ 292static char *chrdev_setup_rx(struct channel_data *channel, int size); 293static int chrdev_rx_done(struct channel_data *channel); 294static int chrdev_tx_done(struct channel_data *channel, int size); 295static ssize_t cosa_read(struct file *file, 296 char __user *buf, size_t count, loff_t *ppos); 297static ssize_t cosa_write(struct file *file, 298 const char __user *buf, size_t count, loff_t *ppos); 299static unsigned int cosa_poll(struct file *file, poll_table *poll); 300static int cosa_open(struct inode *inode, struct file *file); 301static int cosa_release(struct inode *inode, struct file *file); 302static long cosa_chardev_ioctl(struct file *file, unsigned int cmd, 303 unsigned long arg); 304#ifdef COSA_FASYNC_WORKING 305static int cosa_fasync(struct inode *inode, struct file *file, int on); 306#endif 307 308static const struct file_operations cosa_fops = { 309 .owner = THIS_MODULE, 310 .llseek = no_llseek, 311 .read = cosa_read, 312 .write = cosa_write, 313 .poll = cosa_poll, 314 .unlocked_ioctl = cosa_chardev_ioctl, 315 .open = cosa_open, 316 .release = cosa_release, 317#ifdef COSA_FASYNC_WORKING 318 .fasync = cosa_fasync, 319#endif 320}; 321 322/* Ioctls */ 323static int cosa_start(struct cosa_data *cosa, int address); 324static int cosa_reset(struct cosa_data *cosa); 325static int cosa_download(struct cosa_data *cosa, void __user *a); 326static int cosa_readmem(struct cosa_data *cosa, void __user *a); 327 328/* COSA/SRP ROM monitor */ 329static int download(struct cosa_data *cosa, const char __user *data, int addr, int len); 330static int startmicrocode(struct cosa_data *cosa, int address); 331static int readmem(struct cosa_data *cosa, char __user *data, int addr, int len); 332static int cosa_reset_and_read_id(struct cosa_data *cosa, char *id); 333 334/* Auxiliary functions */ 335static int get_wait_data(struct cosa_data *cosa); 336static int put_wait_data(struct cosa_data *cosa, int data); 337static int puthexnumber(struct cosa_data *cosa, int number); 338static void put_driver_status(struct cosa_data *cosa); 339static void put_driver_status_nolock(struct cosa_data *cosa); 340 341/* Interrupt handling */ 342static irqreturn_t cosa_interrupt(int irq, void *cosa); 343 344/* I/O ops debugging */ 345#ifdef DEBUG_IO 346static void debug_data_in(struct cosa_data *cosa, int data); 347static void debug_data_out(struct cosa_data *cosa, int data); 348static void debug_data_cmd(struct cosa_data *cosa, int data); 349static void debug_status_in(struct cosa_data *cosa, int status); 350static void debug_status_out(struct cosa_data *cosa, int status); 351#endif 352 353static inline struct channel_data* dev_to_chan(struct net_device *dev) 354{ 355 return (struct channel_data *)dev_to_hdlc(dev)->priv; 356} 357 358/* ---------- Initialization stuff ---------- */ 359 360static int __init cosa_init(void) 361{ 362 int i, err = 0; 363 364 if (cosa_major > 0) { 365 if (register_chrdev(cosa_major, "cosa", &cosa_fops)) { 366 pr_warn("unable to get major %d\n", cosa_major); 367 err = -EIO; 368 goto out; 369 } 370 } else { 371 if (!(cosa_major=register_chrdev(0, "cosa", &cosa_fops))) { 372 pr_warn("unable to register chardev\n"); 373 err = -EIO; 374 goto out; 375 } 376 } 377 for (i=0; i<MAX_CARDS; i++) 378 cosa_cards[i].num = -1; 379 for (i=0; io[i] != 0 && i < MAX_CARDS; i++) 380 cosa_probe(io[i], irq[i], dma[i]); 381 if (!nr_cards) { 382 pr_warn("no devices found\n"); 383 unregister_chrdev(cosa_major, "cosa"); 384 err = -ENODEV; 385 goto out; 386 } 387 cosa_class = class_create(THIS_MODULE, "cosa"); 388 if (IS_ERR(cosa_class)) { 389 err = PTR_ERR(cosa_class); 390 goto out_chrdev; 391 } 392 for (i = 0; i < nr_cards; i++) 393 device_create(cosa_class, NULL, MKDEV(cosa_major, i), NULL, 394 "cosa%d", i); 395 err = 0; 396 goto out; 397 398out_chrdev: 399 unregister_chrdev(cosa_major, "cosa"); 400out: 401 return err; 402} 403module_init(cosa_init); 404 405static void __exit cosa_exit(void) 406{ 407 struct cosa_data *cosa; 408 int i; 409 410 for (i = 0; i < nr_cards; i++) 411 device_destroy(cosa_class, MKDEV(cosa_major, i)); 412 class_destroy(cosa_class); 413 414 for (cosa = cosa_cards; nr_cards--; cosa++) { 415 /* Clean up the per-channel data */ 416 for (i = 0; i < cosa->nchannels; i++) { 417 /* Chardev driver has no alloc'd per-channel data */ 418 unregister_hdlc_device(cosa->chan[i].netdev); 419 free_netdev(cosa->chan[i].netdev); 420 } 421 /* Clean up the per-card data */ 422 kfree(cosa->chan); 423 kfree(cosa->bouncebuf); 424 free_irq(cosa->irq, cosa); 425 free_dma(cosa->dma); 426 release_region(cosa->datareg, is_8bit(cosa) ? 2 : 4); 427 } 428 unregister_chrdev(cosa_major, "cosa"); 429} 430module_exit(cosa_exit); 431 432static const struct net_device_ops cosa_ops = { 433 .ndo_open = cosa_net_open, 434 .ndo_stop = cosa_net_close, 435 .ndo_change_mtu = hdlc_change_mtu, 436 .ndo_start_xmit = hdlc_start_xmit, 437 .ndo_do_ioctl = cosa_net_ioctl, 438 .ndo_tx_timeout = cosa_net_timeout, 439}; 440 441static int cosa_probe(int base, int irq, int dma) 442{ 443 struct cosa_data *cosa = cosa_cards+nr_cards; 444 int i, err = 0; 445 446 memset(cosa, 0, sizeof(struct cosa_data)); 447 448 /* Checking validity of parameters: */ 449 /* IRQ should be 2-7 or 10-15; negative IRQ means autoprobe */ 450 if ((irq >= 0 && irq < 2) || irq > 15 || (irq < 10 && irq > 7)) { 451 pr_info("invalid IRQ %d\n", irq); 452 return -1; 453 } 454 /* I/O address should be between 0x100 and 0x3ff and should be 455 * multiple of 8. */ 456 if (base < 0x100 || base > 0x3ff || base & 0x7) { 457 pr_info("invalid I/O address 0x%x\n", base); 458 return -1; 459 } 460 /* DMA should be 0,1 or 3-7 */ 461 if (dma < 0 || dma == 4 || dma > 7) { 462 pr_info("invalid DMA %d\n", dma); 463 return -1; 464 } 465 /* and finally, on 16-bit COSA DMA should be 4-7 and 466 * I/O base should not be multiple of 0x10 */ 467 if (((base & 0x8) && dma < 4) || (!(base & 0x8) && dma > 3)) { 468 pr_info("8/16 bit base and DMA mismatch (base=0x%x, dma=%d)\n", 469 base, dma); 470 return -1; 471 } 472 473 cosa->dma = dma; 474 cosa->datareg = base; 475 cosa->statusreg = is_8bit(cosa)?base+1:base+2; 476 spin_lock_init(&cosa->lock); 477 478 if (!request_region(base, is_8bit(cosa)?2:4,"cosa")) 479 return -1; 480 481 if (cosa_reset_and_read_id(cosa, cosa->id_string) < 0) { 482 printk(KERN_DEBUG "probe at 0x%x failed.\n", base); 483 err = -1; 484 goto err_out; 485 } 486 487 /* Test the validity of identification string */ 488 if (!strncmp(cosa->id_string, "SRP", 3)) 489 cosa->type = "srp"; 490 else if (!strncmp(cosa->id_string, "COSA", 4)) 491 cosa->type = is_8bit(cosa)? "cosa8": "cosa16"; 492 else { 493/* Print a warning only if we are not autoprobing */ 494#ifndef COSA_ISA_AUTOPROBE 495 pr_info("valid signature not found at 0x%x\n", base); 496#endif 497 err = -1; 498 goto err_out; 499 } 500 /* Update the name of the region now we know the type of card */ 501 release_region(base, is_8bit(cosa)?2:4); 502 if (!request_region(base, is_8bit(cosa)?2:4, cosa->type)) { 503 printk(KERN_DEBUG "changing name at 0x%x failed.\n", base); 504 return -1; 505 } 506 507 /* Now do IRQ autoprobe */ 508 if (irq < 0) { 509 unsigned long irqs; 510/* pr_info("IRQ autoprobe\n"); */ 511 irqs = probe_irq_on(); 512 /* 513 * Enable interrupt on tx buffer empty (it sure is) 514 * really sure ? 515 * FIXME: When this code is not used as module, we should 516 * probably call udelay() instead of the interruptible sleep. 517 */ 518 set_current_state(TASK_INTERRUPTIBLE); 519 cosa_putstatus(cosa, SR_TX_INT_ENA); 520 schedule_timeout(30); 521 irq = probe_irq_off(irqs); 522 /* Disable all IRQs from the card */ 523 cosa_putstatus(cosa, 0); 524 /* Empty the received data register */ 525 cosa_getdata8(cosa); 526 527 if (irq < 0) { 528 pr_info("multiple interrupts obtained (%d, board at 0x%x)\n", 529 irq, cosa->datareg); 530 err = -1; 531 goto err_out; 532 } 533 if (irq == 0) { 534 pr_info("no interrupt obtained (board at 0x%x)\n", 535 cosa->datareg); 536 /* return -1; */ 537 } 538 } 539 540 cosa->irq = irq; 541 cosa->num = nr_cards; 542 cosa->usage = 0; 543 cosa->nchannels = 2; /* FIXME: how to determine this? */ 544 545 if (request_irq(cosa->irq, cosa_interrupt, 0, cosa->type, cosa)) { 546 err = -1; 547 goto err_out; 548 } 549 if (request_dma(cosa->dma, cosa->type)) { 550 err = -1; 551 goto err_out1; 552 } 553 554 cosa->bouncebuf = kmalloc(COSA_MTU, GFP_KERNEL|GFP_DMA); 555 if (!cosa->bouncebuf) { 556 err = -ENOMEM; 557 goto err_out2; 558 } 559 sprintf(cosa->name, "cosa%d", cosa->num); 560 561 /* Initialize the per-channel data */ 562 cosa->chan = kcalloc(cosa->nchannels, sizeof(struct channel_data), GFP_KERNEL); 563 if (!cosa->chan) { 564 err = -ENOMEM; 565 goto err_out3; 566 } 567 568 for (i = 0; i < cosa->nchannels; i++) { 569 struct channel_data *chan = &cosa->chan[i]; 570 571 chan->cosa = cosa; 572 chan->num = i; 573 sprintf(chan->name, "cosa%dc%d", chan->cosa->num, i); 574 575 /* Initialize the chardev data structures */ 576 mutex_init(&chan->rlock); 577 sema_init(&chan->wsem, 1); 578 579 /* Register the network interface */ 580 if (!(chan->netdev = alloc_hdlcdev(chan))) { 581 pr_warn("%s: alloc_hdlcdev failed\n", chan->name); 582 goto err_hdlcdev; 583 } 584 dev_to_hdlc(chan->netdev)->attach = cosa_net_attach; 585 dev_to_hdlc(chan->netdev)->xmit = cosa_net_tx; 586 chan->netdev->netdev_ops = &cosa_ops; 587 chan->netdev->watchdog_timeo = TX_TIMEOUT; 588 chan->netdev->base_addr = chan->cosa->datareg; 589 chan->netdev->irq = chan->cosa->irq; 590 chan->netdev->dma = chan->cosa->dma; 591 if (register_hdlc_device(chan->netdev)) { 592 netdev_warn(chan->netdev, 593 "register_hdlc_device() failed\n"); 594 free_netdev(chan->netdev); 595 goto err_hdlcdev; 596 } 597 } 598 599 pr_info("cosa%d: %s (%s at 0x%x irq %d dma %d), %d channels\n", 600 cosa->num, cosa->id_string, cosa->type, 601 cosa->datareg, cosa->irq, cosa->dma, cosa->nchannels); 602 603 return nr_cards++; 604 605err_hdlcdev: 606 while (i-- > 0) { 607 unregister_hdlc_device(cosa->chan[i].netdev); 608 free_netdev(cosa->chan[i].netdev); 609 } 610 kfree(cosa->chan); 611err_out3: 612 kfree(cosa->bouncebuf); 613err_out2: 614 free_dma(cosa->dma); 615err_out1: 616 free_irq(cosa->irq, cosa); 617err_out: 618 release_region(cosa->datareg,is_8bit(cosa)?2:4); 619 pr_notice("cosa%d: allocating resources failed\n", cosa->num); 620 return err; 621} 622 623 624/*---------- network device ---------- */ 625 626static int cosa_net_attach(struct net_device *dev, unsigned short encoding, 627 unsigned short parity) 628{ 629 if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT) 630 return 0; 631 return -EINVAL; 632} 633 634static int cosa_net_open(struct net_device *dev) 635{ 636 struct channel_data *chan = dev_to_chan(dev); 637 int err; 638 unsigned long flags; 639 640 if (!(chan->cosa->firmware_status & COSA_FW_START)) { 641 pr_notice("%s: start the firmware first (status %d)\n", 642 chan->cosa->name, chan->cosa->firmware_status); 643 return -EPERM; 644 } 645 spin_lock_irqsave(&chan->cosa->lock, flags); 646 if (chan->usage != 0) { 647 pr_warn("%s: cosa_net_open called with usage count %d\n", 648 chan->name, chan->usage); 649 spin_unlock_irqrestore(&chan->cosa->lock, flags); 650 return -EBUSY; 651 } 652 chan->setup_rx = cosa_net_setup_rx; 653 chan->tx_done = cosa_net_tx_done; 654 chan->rx_done = cosa_net_rx_done; 655 chan->usage = -1; 656 chan->cosa->usage++; 657 spin_unlock_irqrestore(&chan->cosa->lock, flags); 658 659 err = hdlc_open(dev); 660 if (err) { 661 spin_lock_irqsave(&chan->cosa->lock, flags); 662 chan->usage = 0; 663 chan->cosa->usage--; 664 spin_unlock_irqrestore(&chan->cosa->lock, flags); 665 return err; 666 } 667 668 netif_start_queue(dev); 669 cosa_enable_rx(chan); 670 return 0; 671} 672 673static netdev_tx_t cosa_net_tx(struct sk_buff *skb, 674 struct net_device *dev) 675{ 676 struct channel_data *chan = dev_to_chan(dev); 677 678 netif_stop_queue(dev); 679 680 chan->tx_skb = skb; 681 cosa_start_tx(chan, skb->data, skb->len); 682 return NETDEV_TX_OK; 683} 684 685static void cosa_net_timeout(struct net_device *dev) 686{ 687 struct channel_data *chan = dev_to_chan(dev); 688 689 if (test_bit(RXBIT, &chan->cosa->rxtx)) { 690 chan->netdev->stats.rx_errors++; 691 chan->netdev->stats.rx_missed_errors++; 692 } else { 693 chan->netdev->stats.tx_errors++; 694 chan->netdev->stats.tx_aborted_errors++; 695 } 696 cosa_kick(chan->cosa); 697 if (chan->tx_skb) { 698 dev_kfree_skb(chan->tx_skb); 699 chan->tx_skb = NULL; 700 } 701 netif_wake_queue(dev); 702} 703 704static int cosa_net_close(struct net_device *dev) 705{ 706 struct channel_data *chan = dev_to_chan(dev); 707 unsigned long flags; 708 709 netif_stop_queue(dev); 710 hdlc_close(dev); 711 cosa_disable_rx(chan); 712 spin_lock_irqsave(&chan->cosa->lock, flags); 713 if (chan->rx_skb) { 714 kfree_skb(chan->rx_skb); 715 chan->rx_skb = NULL; 716 } 717 if (chan->tx_skb) { 718 kfree_skb(chan->tx_skb); 719 chan->tx_skb = NULL; 720 } 721 chan->usage = 0; 722 chan->cosa->usage--; 723 spin_unlock_irqrestore(&chan->cosa->lock, flags); 724 return 0; 725} 726 727static char *cosa_net_setup_rx(struct channel_data *chan, int size) 728{ 729 /* 730 * We can safely fall back to non-dma-able memory, because we have 731 * the cosa->bouncebuf pre-allocated. 732 */ 733 kfree_skb(chan->rx_skb); 734 chan->rx_skb = dev_alloc_skb(size); 735 if (chan->rx_skb == NULL) { 736 pr_notice("%s: Memory squeeze, dropping packet\n", chan->name); 737 chan->netdev->stats.rx_dropped++; 738 return NULL; 739 } 740 chan->netdev->trans_start = jiffies; 741 return skb_put(chan->rx_skb, size); 742} 743 744static int cosa_net_rx_done(struct channel_data *chan) 745{ 746 if (!chan->rx_skb) { 747 pr_warn("%s: rx_done with empty skb!\n", chan->name); 748 chan->netdev->stats.rx_errors++; 749 chan->netdev->stats.rx_frame_errors++; 750 return 0; 751 } 752 chan->rx_skb->protocol = hdlc_type_trans(chan->rx_skb, chan->netdev); 753 chan->rx_skb->dev = chan->netdev; 754 skb_reset_mac_header(chan->rx_skb); 755 chan->netdev->stats.rx_packets++; 756 chan->netdev->stats.rx_bytes += chan->cosa->rxsize; 757 netif_rx(chan->rx_skb); 758 chan->rx_skb = NULL; 759 return 0; 760} 761 762/* ARGSUSED */ 763static int cosa_net_tx_done(struct channel_data *chan, int size) 764{ 765 if (!chan->tx_skb) { 766 pr_warn("%s: tx_done with empty skb!\n", chan->name); 767 chan->netdev->stats.tx_errors++; 768 chan->netdev->stats.tx_aborted_errors++; 769 return 1; 770 } 771 dev_kfree_skb_irq(chan->tx_skb); 772 chan->tx_skb = NULL; 773 chan->netdev->stats.tx_packets++; 774 chan->netdev->stats.tx_bytes += size; 775 netif_wake_queue(chan->netdev); 776 return 1; 777} 778 779/*---------- Character device ---------- */ 780 781static ssize_t cosa_read(struct file *file, 782 char __user *buf, size_t count, loff_t *ppos) 783{ 784 DECLARE_WAITQUEUE(wait, current); 785 unsigned long flags; 786 struct channel_data *chan = file->private_data; 787 struct cosa_data *cosa = chan->cosa; 788 char *kbuf; 789 790 if (!(cosa->firmware_status & COSA_FW_START)) { 791 pr_notice("%s: start the firmware first (status %d)\n", 792 cosa->name, cosa->firmware_status); 793 return -EPERM; 794 } 795 if (mutex_lock_interruptible(&chan->rlock)) 796 return -ERESTARTSYS; 797 798 if ((chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL)) == NULL) { 799 pr_info("%s: cosa_read() - OOM\n", cosa->name); 800 mutex_unlock(&chan->rlock); 801 return -ENOMEM; 802 } 803 804 chan->rx_status = 0; 805 cosa_enable_rx(chan); 806 spin_lock_irqsave(&cosa->lock, flags); 807 add_wait_queue(&chan->rxwaitq, &wait); 808 while (!chan->rx_status) { 809 current->state = TASK_INTERRUPTIBLE; 810 spin_unlock_irqrestore(&cosa->lock, flags); 811 schedule(); 812 spin_lock_irqsave(&cosa->lock, flags); 813 if (signal_pending(current) && chan->rx_status == 0) { 814 chan->rx_status = 1; 815 remove_wait_queue(&chan->rxwaitq, &wait); 816 current->state = TASK_RUNNING; 817 spin_unlock_irqrestore(&cosa->lock, flags); 818 mutex_unlock(&chan->rlock); 819 return -ERESTARTSYS; 820 } 821 } 822 remove_wait_queue(&chan->rxwaitq, &wait); 823 current->state = TASK_RUNNING; 824 kbuf = chan->rxdata; 825 count = chan->rxsize; 826 spin_unlock_irqrestore(&cosa->lock, flags); 827 mutex_unlock(&chan->rlock); 828 829 if (copy_to_user(buf, kbuf, count)) { 830 kfree(kbuf); 831 return -EFAULT; 832 } 833 kfree(kbuf); 834 return count; 835} 836 837static char *chrdev_setup_rx(struct channel_data *chan, int size) 838{ 839 /* Expect size <= COSA_MTU */ 840 chan->rxsize = size; 841 return chan->rxdata; 842} 843 844static int chrdev_rx_done(struct channel_data *chan) 845{ 846 if (chan->rx_status) { /* Reader has died */ 847 kfree(chan->rxdata); 848 up(&chan->wsem); 849 } 850 chan->rx_status = 1; 851 wake_up_interruptible(&chan->rxwaitq); 852 return 1; 853} 854 855 856static ssize_t cosa_write(struct file *file, 857 const char __user *buf, size_t count, loff_t *ppos) 858{ 859 DECLARE_WAITQUEUE(wait, current); 860 struct channel_data *chan = file->private_data; 861 struct cosa_data *cosa = chan->cosa; 862 unsigned long flags; 863 char *kbuf; 864 865 if (!(cosa->firmware_status & COSA_FW_START)) { 866 pr_notice("%s: start the firmware first (status %d)\n", 867 cosa->name, cosa->firmware_status); 868 return -EPERM; 869 } 870 if (down_interruptible(&chan->wsem)) 871 return -ERESTARTSYS; 872 873 if (count > COSA_MTU) 874 count = COSA_MTU; 875 876 /* Allocate the buffer */ 877 if ((kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA)) == NULL) { 878 pr_notice("%s: cosa_write() OOM - dropping packet\n", 879 cosa->name); 880 up(&chan->wsem); 881 return -ENOMEM; 882 } 883 if (copy_from_user(kbuf, buf, count)) { 884 up(&chan->wsem); 885 kfree(kbuf); 886 return -EFAULT; 887 } 888 chan->tx_status=0; 889 cosa_start_tx(chan, kbuf, count); 890 891 spin_lock_irqsave(&cosa->lock, flags); 892 add_wait_queue(&chan->txwaitq, &wait); 893 while (!chan->tx_status) { 894 current->state = TASK_INTERRUPTIBLE; 895 spin_unlock_irqrestore(&cosa->lock, flags); 896 schedule(); 897 spin_lock_irqsave(&cosa->lock, flags); 898 if (signal_pending(current) && chan->tx_status == 0) { 899 chan->tx_status = 1; 900 remove_wait_queue(&chan->txwaitq, &wait); 901 current->state = TASK_RUNNING; 902 chan->tx_status = 1; 903 spin_unlock_irqrestore(&cosa->lock, flags); 904 up(&chan->wsem); 905 return -ERESTARTSYS; 906 } 907 } 908 remove_wait_queue(&chan->txwaitq, &wait); 909 current->state = TASK_RUNNING; 910 up(&chan->wsem); 911 spin_unlock_irqrestore(&cosa->lock, flags); 912 kfree(kbuf); 913 return count; 914} 915 916static int chrdev_tx_done(struct channel_data *chan, int size) 917{ 918 if (chan->tx_status) { /* Writer was interrupted */ 919 kfree(chan->txbuf); 920 up(&chan->wsem); 921 } 922 chan->tx_status = 1; 923 wake_up_interruptible(&chan->txwaitq); 924 return 1; 925} 926 927static unsigned int cosa_poll(struct file *file, poll_table *poll) 928{ 929 pr_info("cosa_poll is here\n"); 930 return 0; 931} 932 933static int cosa_open(struct inode *inode, struct file *file) 934{ 935 struct cosa_data *cosa; 936 struct channel_data *chan; 937 unsigned long flags; 938 int n; 939 int ret = 0; 940 941 mutex_lock(&cosa_chardev_mutex); 942 if ((n=iminor(file->f_path.dentry->d_inode)>>CARD_MINOR_BITS) 943 >= nr_cards) { 944 ret = -ENODEV; 945 goto out; 946 } 947 cosa = cosa_cards+n; 948 949 if ((n=iminor(file->f_path.dentry->d_inode) 950 & ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) { 951 ret = -ENODEV; 952 goto out; 953 } 954 chan = cosa->chan + n; 955 956 file->private_data = chan; 957 958 spin_lock_irqsave(&cosa->lock, flags); 959 960 if (chan->usage < 0) { /* in netdev mode */ 961 spin_unlock_irqrestore(&cosa->lock, flags); 962 ret = -EBUSY; 963 goto out; 964 } 965 cosa->usage++; 966 chan->usage++; 967 968 chan->tx_done = chrdev_tx_done; 969 chan->setup_rx = chrdev_setup_rx; 970 chan->rx_done = chrdev_rx_done; 971 spin_unlock_irqrestore(&cosa->lock, flags); 972out: 973 mutex_unlock(&cosa_chardev_mutex); 974 return ret; 975} 976 977static int cosa_release(struct inode *inode, struct file *file) 978{ 979 struct channel_data *channel = file->private_data; 980 struct cosa_data *cosa; 981 unsigned long flags; 982 983 cosa = channel->cosa; 984 spin_lock_irqsave(&cosa->lock, flags); 985 cosa->usage--; 986 channel->usage--; 987 spin_unlock_irqrestore(&cosa->lock, flags); 988 return 0; 989} 990 991#ifdef COSA_FASYNC_WORKING 992static struct fasync_struct *fasync[256] = { NULL, }; 993 994/* To be done ... */ 995static int cosa_fasync(struct inode *inode, struct file *file, int on) 996{ 997 int port = iminor(inode); 998 999 return fasync_helper(inode, file, on, &fasync[port]); 1000} 1001#endif 1002 1003 1004/* ---------- Ioctls ---------- */ 1005 1006/* 1007 * Ioctl subroutines can safely be made inline, because they are called 1008 * only from cosa_ioctl(). 1009 */ 1010static inline int cosa_reset(struct cosa_data *cosa) 1011{ 1012 char idstring[COSA_MAX_ID_STRING]; 1013 if (cosa->usage > 1) 1014 pr_info("cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1015 cosa->num, cosa->usage); 1016 cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START); 1017 if (cosa_reset_and_read_id(cosa, idstring) < 0) { 1018 pr_notice("cosa%d: reset failed\n", cosa->num); 1019 return -EIO; 1020 } 1021 pr_info("cosa%d: resetting device: %s\n", cosa->num, idstring); 1022 cosa->firmware_status |= COSA_FW_RESET; 1023 return 0; 1024} 1025 1026/* High-level function to download data into COSA memory. Calls download() */ 1027static inline int cosa_download(struct cosa_data *cosa, void __user *arg) 1028{ 1029 struct cosa_download d; 1030 int i; 1031 1032 if (cosa->usage > 1) 1033 pr_info("%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1034 cosa->name, cosa->usage); 1035 if (!(cosa->firmware_status & COSA_FW_RESET)) { 1036 pr_notice("%s: reset the card first (status %d)\n", 1037 cosa->name, cosa->firmware_status); 1038 return -EPERM; 1039 } 1040 1041 if (copy_from_user(&d, arg, sizeof(d))) 1042 return -EFAULT; 1043 1044 if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE) 1045 return -EINVAL; 1046 if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE) 1047 return -EINVAL; 1048 1049 1050 /* If something fails, force the user to reset the card */ 1051 cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD); 1052 1053 i = download(cosa, d.code, d.len, d.addr); 1054 if (i < 0) { 1055 pr_notice("cosa%d: microcode download failed: %d\n", 1056 cosa->num, i); 1057 return -EIO; 1058 } 1059 pr_info("cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n", 1060 cosa->num, d.len, d.addr); 1061 cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD; 1062 return 0; 1063} 1064 1065/* High-level function to read COSA memory. Calls readmem() */ 1066static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg) 1067{ 1068 struct cosa_download d; 1069 int i; 1070 1071 if (cosa->usage > 1) 1072 pr_info("cosa%d: WARNING: readmem requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1073 cosa->num, cosa->usage); 1074 if (!(cosa->firmware_status & COSA_FW_RESET)) { 1075 pr_notice("%s: reset the card first (status %d)\n", 1076 cosa->name, cosa->firmware_status); 1077 return -EPERM; 1078 } 1079 1080 if (copy_from_user(&d, arg, sizeof(d))) 1081 return -EFAULT; 1082 1083 /* If something fails, force the user to reset the card */ 1084 cosa->firmware_status &= ~COSA_FW_RESET; 1085 1086 i = readmem(cosa, d.code, d.len, d.addr); 1087 if (i < 0) { 1088 pr_notice("cosa%d: reading memory failed: %d\n", cosa->num, i); 1089 return -EIO; 1090 } 1091 pr_info("cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n", 1092 cosa->num, d.len, d.addr); 1093 cosa->firmware_status |= COSA_FW_RESET; 1094 return 0; 1095} 1096 1097/* High-level function to start microcode. Calls startmicrocode(). */ 1098static inline int cosa_start(struct cosa_data *cosa, int address) 1099{ 1100 int i; 1101 1102 if (cosa->usage > 1) 1103 pr_info("cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1104 cosa->num, cosa->usage); 1105 1106 if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD)) 1107 != (COSA_FW_RESET|COSA_FW_DOWNLOAD)) { 1108 pr_notice("%s: download the microcode and/or reset the card first (status %d)\n", 1109 cosa->name, cosa->firmware_status); 1110 return -EPERM; 1111 } 1112 cosa->firmware_status &= ~COSA_FW_RESET; 1113 if ((i=startmicrocode(cosa, address)) < 0) { 1114 pr_notice("cosa%d: start microcode at 0x%04x failed: %d\n", 1115 cosa->num, address, i); 1116 return -EIO; 1117 } 1118 pr_info("cosa%d: starting microcode at 0x%04x\n", cosa->num, address); 1119 cosa->startaddr = address; 1120 cosa->firmware_status |= COSA_FW_START; 1121 return 0; 1122} 1123 1124/* Buffer of size at least COSA_MAX_ID_STRING is expected */ 1125static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string) 1126{ 1127 int l = strlen(cosa->id_string)+1; 1128 if (copy_to_user(string, cosa->id_string, l)) 1129 return -EFAULT; 1130 return l; 1131} 1132 1133/* Buffer of size at least COSA_MAX_ID_STRING is expected */ 1134static inline int cosa_gettype(struct cosa_data *cosa, char __user *string) 1135{ 1136 int l = strlen(cosa->type)+1; 1137 if (copy_to_user(string, cosa->type, l)) 1138 return -EFAULT; 1139 return l; 1140} 1141 1142static int cosa_ioctl_common(struct cosa_data *cosa, 1143 struct channel_data *channel, unsigned int cmd, unsigned long arg) 1144{ 1145 void __user *argp = (void __user *)arg; 1146 switch (cmd) { 1147 case COSAIORSET: /* Reset the device */ 1148 if (!capable(CAP_NET_ADMIN)) 1149 return -EACCES; 1150 return cosa_reset(cosa); 1151 case COSAIOSTRT: /* Start the firmware */ 1152 if (!capable(CAP_SYS_RAWIO)) 1153 return -EACCES; 1154 return cosa_start(cosa, arg); 1155 case COSAIODOWNLD: /* Download the firmware */ 1156 if (!capable(CAP_SYS_RAWIO)) 1157 return -EACCES; 1158 1159 return cosa_download(cosa, argp); 1160 case COSAIORMEM: 1161 if (!capable(CAP_SYS_RAWIO)) 1162 return -EACCES; 1163 return cosa_readmem(cosa, argp); 1164 case COSAIORTYPE: 1165 return cosa_gettype(cosa, argp); 1166 case COSAIORIDSTR: 1167 return cosa_getidstr(cosa, argp); 1168 case COSAIONRCARDS: 1169 return nr_cards; 1170 case COSAIONRCHANS: 1171 return cosa->nchannels; 1172 case COSAIOBMSET: 1173 if (!capable(CAP_SYS_RAWIO)) 1174 return -EACCES; 1175 if (is_8bit(cosa)) 1176 return -EINVAL; 1177 if (arg != COSA_BM_OFF && arg != COSA_BM_ON) 1178 return -EINVAL; 1179 cosa->busmaster = arg; 1180 return 0; 1181 case COSAIOBMGET: 1182 return cosa->busmaster; 1183 } 1184 return -ENOIOCTLCMD; 1185} 1186 1187static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1188{ 1189 int rv; 1190 struct channel_data *chan = dev_to_chan(dev); 1191 rv = cosa_ioctl_common(chan->cosa, chan, cmd, 1192 (unsigned long)ifr->ifr_data); 1193 if (rv != -ENOIOCTLCMD) 1194 return rv; 1195 return hdlc_ioctl(dev, ifr, cmd); 1196} 1197 1198static long cosa_chardev_ioctl(struct file *file, unsigned int cmd, 1199 unsigned long arg) 1200{ 1201 struct channel_data *channel = file->private_data; 1202 struct cosa_data *cosa; 1203 long ret; 1204 1205 mutex_lock(&cosa_chardev_mutex); 1206 cosa = channel->cosa; 1207 ret = cosa_ioctl_common(cosa, channel, cmd, arg); 1208 mutex_unlock(&cosa_chardev_mutex); 1209 return ret; 1210} 1211 1212 1213/*---------- HW layer interface ---------- */ 1214 1215/* 1216 * The higher layer can bind itself to the HW layer by setting the callbacks 1217 * in the channel_data structure and by using these routines. 1218 */ 1219static void cosa_enable_rx(struct channel_data *chan) 1220{ 1221 struct cosa_data *cosa = chan->cosa; 1222 1223 if (!test_and_set_bit(chan->num, &cosa->rxbitmap)) 1224 put_driver_status(cosa); 1225} 1226 1227static void cosa_disable_rx(struct channel_data *chan) 1228{ 1229 struct cosa_data *cosa = chan->cosa; 1230 1231 if (test_and_clear_bit(chan->num, &cosa->rxbitmap)) 1232 put_driver_status(cosa); 1233} 1234 1235/* 1236 * FIXME: This routine probably should check for cosa_start_tx() called when 1237 * the previous transmit is still unfinished. In this case the non-zero 1238 * return value should indicate to the caller that the queuing(sp?) up 1239 * the transmit has failed. 1240 */ 1241static int cosa_start_tx(struct channel_data *chan, char *buf, int len) 1242{ 1243 struct cosa_data *cosa = chan->cosa; 1244 unsigned long flags; 1245#ifdef DEBUG_DATA 1246 int i; 1247 1248 pr_info("cosa%dc%d: starting tx(0x%x)", 1249 chan->cosa->num, chan->num, len); 1250 for (i=0; i<len; i++) 1251 pr_cont(" %02x", buf[i]&0xff); 1252 pr_cont("\n"); 1253#endif 1254 spin_lock_irqsave(&cosa->lock, flags); 1255 chan->txbuf = buf; 1256 chan->txsize = len; 1257 if (len > COSA_MTU) 1258 chan->txsize = COSA_MTU; 1259 spin_unlock_irqrestore(&cosa->lock, flags); 1260 1261 /* Tell the firmware we are ready */ 1262 set_bit(chan->num, &cosa->txbitmap); 1263 put_driver_status(cosa); 1264 1265 return 0; 1266} 1267 1268static void put_driver_status(struct cosa_data *cosa) 1269{ 1270 unsigned long flags; 1271 int status; 1272 1273 spin_lock_irqsave(&cosa->lock, flags); 1274 1275 status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) 1276 | (cosa->txbitmap ? DRIVER_TX_READY : 0) 1277 | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) 1278 &DRIVER_TXMAP_MASK : 0); 1279 if (!cosa->rxtx) { 1280 if (cosa->rxbitmap|cosa->txbitmap) { 1281 if (!cosa->enabled) { 1282 cosa_putstatus(cosa, SR_RX_INT_ENA); 1283#ifdef DEBUG_IO 1284 debug_status_out(cosa, SR_RX_INT_ENA); 1285#endif 1286 cosa->enabled = 1; 1287 } 1288 } else if (cosa->enabled) { 1289 cosa->enabled = 0; 1290 cosa_putstatus(cosa, 0); 1291#ifdef DEBUG_IO 1292 debug_status_out(cosa, 0); 1293#endif 1294 } 1295 cosa_putdata8(cosa, status); 1296#ifdef DEBUG_IO 1297 debug_data_cmd(cosa, status); 1298#endif 1299 } 1300 spin_unlock_irqrestore(&cosa->lock, flags); 1301} 1302 1303static void put_driver_status_nolock(struct cosa_data *cosa) 1304{ 1305 int status; 1306 1307 status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) 1308 | (cosa->txbitmap ? DRIVER_TX_READY : 0) 1309 | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) 1310 &DRIVER_TXMAP_MASK : 0); 1311 1312 if (cosa->rxbitmap|cosa->txbitmap) { 1313 cosa_putstatus(cosa, SR_RX_INT_ENA); 1314#ifdef DEBUG_IO 1315 debug_status_out(cosa, SR_RX_INT_ENA); 1316#endif 1317 cosa->enabled = 1; 1318 } else { 1319 cosa_putstatus(cosa, 0); 1320#ifdef DEBUG_IO 1321 debug_status_out(cosa, 0); 1322#endif 1323 cosa->enabled = 0; 1324 } 1325 cosa_putdata8(cosa, status); 1326#ifdef DEBUG_IO 1327 debug_data_cmd(cosa, status); 1328#endif 1329} 1330 1331/* 1332 * The "kickme" function: When the DMA times out, this is called to 1333 * clean up the driver status. 1334 * FIXME: Preliminary support, the interface is probably wrong. 1335 */ 1336static void cosa_kick(struct cosa_data *cosa) 1337{ 1338 unsigned long flags, flags1; 1339 char *s = "(probably) IRQ"; 1340 1341 if (test_bit(RXBIT, &cosa->rxtx)) 1342 s = "RX DMA"; 1343 if (test_bit(TXBIT, &cosa->rxtx)) 1344 s = "TX DMA"; 1345 1346 pr_info("%s: %s timeout - restarting\n", cosa->name, s); 1347 spin_lock_irqsave(&cosa->lock, flags); 1348 cosa->rxtx = 0; 1349 1350 flags1 = claim_dma_lock(); 1351 disable_dma(cosa->dma); 1352 clear_dma_ff(cosa->dma); 1353 release_dma_lock(flags1); 1354 1355 /* FIXME: Anything else? */ 1356 udelay(100); 1357 cosa_putstatus(cosa, 0); 1358 udelay(100); 1359 (void) cosa_getdata8(cosa); 1360 udelay(100); 1361 cosa_putdata8(cosa, 0); 1362 udelay(100); 1363 put_driver_status_nolock(cosa); 1364 spin_unlock_irqrestore(&cosa->lock, flags); 1365} 1366 1367/* 1368 * Check if the whole buffer is DMA-able. It means it is below the 16M of 1369 * physical memory and doesn't span the 64k boundary. For now it seems 1370 * SKB's never do this, but we'll check this anyway. 1371 */ 1372static int cosa_dma_able(struct channel_data *chan, char *buf, int len) 1373{ 1374 static int count; 1375 unsigned long b = (unsigned long)buf; 1376 if (b+len >= MAX_DMA_ADDRESS) 1377 return 0; 1378 if ((b^ (b+len)) & 0x10000) { 1379 if (count++ < 5) 1380 pr_info("%s: packet spanning a 64k boundary\n", 1381 chan->name); 1382 return 0; 1383 } 1384 return 1; 1385} 1386 1387 1388/* ---------- The SRP/COSA ROM monitor functions ---------- */ 1389 1390/* 1391 * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=", 1392 * drivers need to say 4-digit hex number meaning start address of the microcode 1393 * separated by a single space. Monitor replies by saying " =". Now driver 1394 * has to write 4-digit hex number meaning the last byte address ended 1395 * by a single space. Monitor has to reply with a space. Now the download 1396 * begins. After the download monitor replies with "\r\n." (CR LF dot). 1397 */ 1398static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address) 1399{ 1400 int i; 1401 1402 if (put_wait_data(cosa, 'w') == -1) return -1; 1403 if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;} 1404 if (get_wait_data(cosa) != '=') return -3; 1405 1406 if (puthexnumber(cosa, address) < 0) return -4; 1407 if (put_wait_data(cosa, ' ') == -1) return -10; 1408 if (get_wait_data(cosa) != ' ') return -11; 1409 if (get_wait_data(cosa) != '=') return -12; 1410 1411 if (puthexnumber(cosa, address+length-1) < 0) return -13; 1412 if (put_wait_data(cosa, ' ') == -1) return -18; 1413 if (get_wait_data(cosa) != ' ') return -19; 1414 1415 while (length--) { 1416 char c; 1417#ifndef SRP_DOWNLOAD_AT_BOOT 1418 if (get_user(c, microcode)) 1419 return -23; /* ??? */ 1420#else 1421 c = *microcode; 1422#endif 1423 if (put_wait_data(cosa, c) == -1) 1424 return -20; 1425 microcode++; 1426 } 1427 1428 if (get_wait_data(cosa) != '\r') return -21; 1429 if (get_wait_data(cosa) != '\n') return -22; 1430 if (get_wait_data(cosa) != '.') return -23; 1431#if 0 1432 printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num); 1433#endif 1434 return 0; 1435} 1436 1437 1438/* 1439 * Starting microcode is done via the "g" command of the SRP monitor. 1440 * The chat should be the following: "g" "g=" "<addr><CR>" 1441 * "<CR><CR><LF><CR><LF>". 1442 */ 1443static int startmicrocode(struct cosa_data *cosa, int address) 1444{ 1445 if (put_wait_data(cosa, 'g') == -1) return -1; 1446 if (get_wait_data(cosa) != 'g') return -2; 1447 if (get_wait_data(cosa) != '=') return -3; 1448 1449 if (puthexnumber(cosa, address) < 0) return -4; 1450 if (put_wait_data(cosa, '\r') == -1) return -5; 1451 1452 if (get_wait_data(cosa) != '\r') return -6; 1453 if (get_wait_data(cosa) != '\r') return -7; 1454 if (get_wait_data(cosa) != '\n') return -8; 1455 if (get_wait_data(cosa) != '\r') return -9; 1456 if (get_wait_data(cosa) != '\n') return -10; 1457#if 0 1458 printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num); 1459#endif 1460 return 0; 1461} 1462 1463/* 1464 * Reading memory is done via the "r" command of the SRP monitor. 1465 * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " " 1466 * Then driver can read the data and the conversation is finished 1467 * by SRP monitor sending "<CR><LF>." (dot at the end). 1468 * 1469 * This routine is not needed during the normal operation and serves 1470 * for debugging purposes only. 1471 */ 1472static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address) 1473{ 1474 if (put_wait_data(cosa, 'r') == -1) return -1; 1475 if ((get_wait_data(cosa)) != 'r') return -2; 1476 if ((get_wait_data(cosa)) != '=') return -3; 1477 1478 if (puthexnumber(cosa, address) < 0) return -4; 1479 if (put_wait_data(cosa, ' ') == -1) return -5; 1480 if (get_wait_data(cosa) != ' ') return -6; 1481 if (get_wait_data(cosa) != '=') return -7; 1482 1483 if (puthexnumber(cosa, address+length-1) < 0) return -8; 1484 if (put_wait_data(cosa, ' ') == -1) return -9; 1485 if (get_wait_data(cosa) != ' ') return -10; 1486 1487 while (length--) { 1488 char c; 1489 int i; 1490 if ((i=get_wait_data(cosa)) == -1) { 1491 pr_info("0x%04x bytes remaining\n", length); 1492 return -11; 1493 } 1494 c=i; 1495#if 1 1496 if (put_user(c, microcode)) 1497 return -23; /* ??? */ 1498#else 1499 *microcode = c; 1500#endif 1501 microcode++; 1502 } 1503 1504 if (get_wait_data(cosa) != '\r') return -21; 1505 if (get_wait_data(cosa) != '\n') return -22; 1506 if (get_wait_data(cosa) != '.') return -23; 1507#if 0 1508 printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num); 1509#endif 1510 return 0; 1511} 1512 1513/* 1514 * This function resets the device and reads the initial prompt 1515 * of the device's ROM monitor. 1516 */ 1517static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring) 1518{ 1519 int i=0, id=0, prev=0, curr=0; 1520 1521 /* Reset the card ... */ 1522 cosa_putstatus(cosa, 0); 1523 cosa_getdata8(cosa); 1524 cosa_putstatus(cosa, SR_RST); 1525#ifdef MODULE 1526 msleep(500); 1527#else 1528 udelay(5*100000); 1529#endif 1530 /* Disable all IRQs from the card */ 1531 cosa_putstatus(cosa, 0); 1532 1533 /* 1534 * Try to read the ID string. The card then prints out the 1535 * identification string ended by the "\n\x2e". 1536 * 1537 * The following loop is indexed through i (instead of id) 1538 * to avoid looping forever when for any reason 1539 * the port returns '\r', '\n' or '\x2e' permanently. 1540 */ 1541 for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) { 1542 if ((curr = get_wait_data(cosa)) == -1) { 1543 return -1; 1544 } 1545 curr &= 0xff; 1546 if (curr != '\r' && curr != '\n' && curr != 0x2e) 1547 idstring[id++] = curr; 1548 if (curr == 0x2e && prev == '\n') 1549 break; 1550 } 1551 /* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */ 1552 idstring[id] = '\0'; 1553 return id; 1554} 1555 1556 1557/* ---------- Auxiliary routines for COSA/SRP monitor ---------- */ 1558 1559/* 1560 * This routine gets the data byte from the card waiting for the SR_RX_RDY 1561 * bit to be set in a loop. It should be used in the exceptional cases 1562 * only (for example when resetting the card or downloading the firmware. 1563 */ 1564static int get_wait_data(struct cosa_data *cosa) 1565{ 1566 int retries = 1000; 1567 1568 while (--retries) { 1569 /* read data and return them */ 1570 if (cosa_getstatus(cosa) & SR_RX_RDY) { 1571 short r; 1572 r = cosa_getdata8(cosa); 1573#if 0 1574 pr_info("get_wait_data returning after %d retries\n", 1575 999-retries); 1576#endif 1577 return r; 1578 } 1579 /* sleep if not ready to read */ 1580 schedule_timeout_interruptible(1); 1581 } 1582 pr_info("timeout in get_wait_data (status 0x%x)\n", 1583 cosa_getstatus(cosa)); 1584 return -1; 1585} 1586 1587/* 1588 * This routine puts the data byte to the card waiting for the SR_TX_RDY 1589 * bit to be set in a loop. It should be used in the exceptional cases 1590 * only (for example when resetting the card or downloading the firmware). 1591 */ 1592static int put_wait_data(struct cosa_data *cosa, int data) 1593{ 1594 int retries = 1000; 1595 while (--retries) { 1596 /* read data and return them */ 1597 if (cosa_getstatus(cosa) & SR_TX_RDY) { 1598 cosa_putdata8(cosa, data); 1599#if 0 1600 pr_info("Putdata: %d retries\n", 999-retries); 1601#endif 1602 return 0; 1603 } 1604#if 0 1605 /* sleep if not ready to read */ 1606 schedule_timeout_interruptible(1); 1607#endif 1608 } 1609 pr_info("cosa%d: timeout in put_wait_data (status 0x%x)\n", 1610 cosa->num, cosa_getstatus(cosa)); 1611 return -1; 1612} 1613 1614/* 1615 * The following routine puts the hexadecimal number into the SRP monitor 1616 * and verifies the proper echo of the sent bytes. Returns 0 on success, 1617 * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed, 1618 * (-2,-4,-6,-8) means that reading echo failed. 1619 */ 1620static int puthexnumber(struct cosa_data *cosa, int number) 1621{ 1622 char temp[5]; 1623 int i; 1624 1625 /* Well, I should probably replace this by something faster. */ 1626 sprintf(temp, "%04X", number); 1627 for (i=0; i<4; i++) { 1628 if (put_wait_data(cosa, temp[i]) == -1) { 1629 pr_notice("cosa%d: puthexnumber failed to write byte %d\n", 1630 cosa->num, i); 1631 return -1-2*i; 1632 } 1633 if (get_wait_data(cosa) != temp[i]) { 1634 pr_notice("cosa%d: puthexhumber failed to read echo of byte %d\n", 1635 cosa->num, i); 1636 return -2-2*i; 1637 } 1638 } 1639 return 0; 1640} 1641 1642 1643/* ---------- Interrupt routines ---------- */ 1644 1645/* 1646 * There are three types of interrupt: 1647 * At the beginning of transmit - this handled is in tx_interrupt(), 1648 * at the beginning of receive - it is in rx_interrupt() and 1649 * at the end of transmit/receive - it is the eot_interrupt() function. 1650 * These functions are multiplexed by cosa_interrupt() according to the 1651 * COSA status byte. I have moved the rx/tx/eot interrupt handling into 1652 * separate functions to make it more readable. These functions are inline, 1653 * so there should be no overhead of function call. 1654 * 1655 * In the COSA bus-master mode, we need to tell the card the address of a 1656 * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait. 1657 * It's time to use the bottom half :-( 1658 */ 1659 1660/* 1661 * Transmit interrupt routine - called when COSA is willing to obtain 1662 * data from the OS. The most tricky part of the routine is selection 1663 * of channel we (OS) want to send packet for. For SRP we should probably 1664 * use the round-robin approach. The newer COSA firmwares have a simple 1665 * flow-control - in the status word has bits 2 and 3 set to 1 means that the 1666 * channel 0 or 1 doesn't want to receive data. 1667 * 1668 * It seems there is a bug in COSA firmware (need to trace it further): 1669 * When the driver status says that the kernel has no more data for transmit 1670 * (e.g. at the end of TX DMA) and then the kernel changes its mind 1671 * (e.g. new packet is queued to hard_start_xmit()), the card issues 1672 * the TX interrupt but does not mark the channel as ready-to-transmit. 1673 * The fix seems to be to push the packet to COSA despite its request. 1674 * We first try to obey the card's opinion, and then fall back to forced TX. 1675 */ 1676static inline void tx_interrupt(struct cosa_data *cosa, int status) 1677{ 1678 unsigned long flags, flags1; 1679#ifdef DEBUG_IRQS 1680 pr_info("cosa%d: SR_DOWN_REQUEST status=0x%04x\n", cosa->num, status); 1681#endif 1682 spin_lock_irqsave(&cosa->lock, flags); 1683 set_bit(TXBIT, &cosa->rxtx); 1684 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1685 /* flow control, see the comment above */ 1686 int i=0; 1687 if (!cosa->txbitmap) { 1688 pr_warn("%s: No channel wants data in TX IRQ. Expect DMA timeout.\n", 1689 cosa->name); 1690 put_driver_status_nolock(cosa); 1691 clear_bit(TXBIT, &cosa->rxtx); 1692 spin_unlock_irqrestore(&cosa->lock, flags); 1693 return; 1694 } 1695 while (1) { 1696 cosa->txchan++; 1697 i++; 1698 if (cosa->txchan >= cosa->nchannels) 1699 cosa->txchan = 0; 1700 if (!(cosa->txbitmap & (1<<cosa->txchan))) 1701 continue; 1702 if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT))) 1703 break; 1704 /* in second pass, accept first ready-to-TX channel */ 1705 if (i > cosa->nchannels) { 1706 /* Can be safely ignored */ 1707#ifdef DEBUG_IRQS 1708 printk(KERN_DEBUG "%s: Forcing TX " 1709 "to not-ready channel %d\n", 1710 cosa->name, cosa->txchan); 1711#endif 1712 break; 1713 } 1714 } 1715 1716 cosa->txsize = cosa->chan[cosa->txchan].txsize; 1717 if (cosa_dma_able(cosa->chan+cosa->txchan, 1718 cosa->chan[cosa->txchan].txbuf, cosa->txsize)) { 1719 cosa->txbuf = cosa->chan[cosa->txchan].txbuf; 1720 } else { 1721 memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf, 1722 cosa->txsize); 1723 cosa->txbuf = cosa->bouncebuf; 1724 } 1725 } 1726 1727 if (is_8bit(cosa)) { 1728 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1729 cosa_putstatus(cosa, SR_TX_INT_ENA); 1730 cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)| 1731 ((cosa->txsize >> 8) & 0x1f)); 1732#ifdef DEBUG_IO 1733 debug_status_out(cosa, SR_TX_INT_ENA); 1734 debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)| 1735 ((cosa->txsize >> 8) & 0x1f)); 1736 debug_data_in(cosa, cosa_getdata8(cosa)); 1737#else 1738 cosa_getdata8(cosa); 1739#endif 1740 set_bit(IRQBIT, &cosa->rxtx); 1741 spin_unlock_irqrestore(&cosa->lock, flags); 1742 return; 1743 } else { 1744 clear_bit(IRQBIT, &cosa->rxtx); 1745 cosa_putstatus(cosa, 0); 1746 cosa_putdata8(cosa, cosa->txsize&0xff); 1747#ifdef DEBUG_IO 1748 debug_status_out(cosa, 0); 1749 debug_data_out(cosa, cosa->txsize&0xff); 1750#endif 1751 } 1752 } else { 1753 cosa_putstatus(cosa, SR_TX_INT_ENA); 1754 cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000) 1755 | (cosa->txsize & 0x1fff)); 1756#ifdef DEBUG_IO 1757 debug_status_out(cosa, SR_TX_INT_ENA); 1758 debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000) 1759 | (cosa->txsize & 0x1fff)); 1760 debug_data_in(cosa, cosa_getdata8(cosa)); 1761 debug_status_out(cosa, 0); 1762#else 1763 cosa_getdata8(cosa); 1764#endif 1765 cosa_putstatus(cosa, 0); 1766 } 1767 1768 if (cosa->busmaster) { 1769 unsigned long addr = virt_to_bus(cosa->txbuf); 1770 int count=0; 1771 pr_info("busmaster IRQ\n"); 1772 while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { 1773 count++; 1774 udelay(10); 1775 if (count > 1000) break; 1776 } 1777 pr_info("status %x\n", cosa_getstatus(cosa)); 1778 pr_info("ready after %d loops\n", count); 1779 cosa_putdata16(cosa, (addr >> 16)&0xffff); 1780 1781 count = 0; 1782 while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { 1783 count++; 1784 if (count > 1000) break; 1785 udelay(10); 1786 } 1787 pr_info("ready after %d loops\n", count); 1788 cosa_putdata16(cosa, addr &0xffff); 1789 flags1 = claim_dma_lock(); 1790 set_dma_mode(cosa->dma, DMA_MODE_CASCADE); 1791 enable_dma(cosa->dma); 1792 release_dma_lock(flags1); 1793 } else { 1794 /* start the DMA */ 1795 flags1 = claim_dma_lock(); 1796 disable_dma(cosa->dma); 1797 clear_dma_ff(cosa->dma); 1798 set_dma_mode(cosa->dma, DMA_MODE_WRITE); 1799 set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf)); 1800 set_dma_count(cosa->dma, cosa->txsize); 1801 enable_dma(cosa->dma); 1802 release_dma_lock(flags1); 1803 } 1804 cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); 1805#ifdef DEBUG_IO 1806 debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); 1807#endif 1808 spin_unlock_irqrestore(&cosa->lock, flags); 1809} 1810 1811static inline void rx_interrupt(struct cosa_data *cosa, int status) 1812{ 1813 unsigned long flags; 1814#ifdef DEBUG_IRQS 1815 pr_info("cosa%d: SR_UP_REQUEST\n", cosa->num); 1816#endif 1817 1818 spin_lock_irqsave(&cosa->lock, flags); 1819 set_bit(RXBIT, &cosa->rxtx); 1820 1821 if (is_8bit(cosa)) { 1822 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1823 set_bit(IRQBIT, &cosa->rxtx); 1824 put_driver_status_nolock(cosa); 1825 cosa->rxsize = cosa_getdata8(cosa) <<8; 1826#ifdef DEBUG_IO 1827 debug_data_in(cosa, cosa->rxsize >> 8); 1828#endif 1829 spin_unlock_irqrestore(&cosa->lock, flags); 1830 return; 1831 } else { 1832 clear_bit(IRQBIT, &cosa->rxtx); 1833 cosa->rxsize |= cosa_getdata8(cosa) & 0xff; 1834#ifdef DEBUG_IO 1835 debug_data_in(cosa, cosa->rxsize & 0xff); 1836#endif 1837#if 0 1838 pr_info("cosa%d: receive rxsize = (0x%04x)\n", 1839 cosa->num, cosa->rxsize); 1840#endif 1841 } 1842 } else { 1843 cosa->rxsize = cosa_getdata16(cosa); 1844#ifdef DEBUG_IO 1845 debug_data_in(cosa, cosa->rxsize); 1846#endif 1847#if 0 1848 pr_info("cosa%d: receive rxsize = (0x%04x)\n", 1849 cosa->num, cosa->rxsize); 1850#endif 1851 } 1852 if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) { 1853 pr_warn("%s: rx for unknown channel (0x%04x)\n", 1854 cosa->name, cosa->rxsize); 1855 spin_unlock_irqrestore(&cosa->lock, flags); 1856 goto reject; 1857 } 1858 cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13); 1859 cosa->rxsize &= 0x1fff; 1860 spin_unlock_irqrestore(&cosa->lock, flags); 1861 1862 cosa->rxbuf = NULL; 1863 if (cosa->rxchan->setup_rx) 1864 cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize); 1865 1866 if (!cosa->rxbuf) { 1867reject: /* Reject the packet */ 1868 pr_info("cosa%d: rejecting packet on channel %d\n", 1869 cosa->num, cosa->rxchan->num); 1870 cosa->rxbuf = cosa->bouncebuf; 1871 } 1872 1873 /* start the DMA */ 1874 flags = claim_dma_lock(); 1875 disable_dma(cosa->dma); 1876 clear_dma_ff(cosa->dma); 1877 set_dma_mode(cosa->dma, DMA_MODE_READ); 1878 if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) { 1879 set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf)); 1880 } else { 1881 set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf)); 1882 } 1883 set_dma_count(cosa->dma, (cosa->rxsize&0x1fff)); 1884 enable_dma(cosa->dma); 1885 release_dma_lock(flags); 1886 spin_lock_irqsave(&cosa->lock, flags); 1887 cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); 1888 if (!is_8bit(cosa) && (status & SR_TX_RDY)) 1889 cosa_putdata8(cosa, DRIVER_RX_READY); 1890#ifdef DEBUG_IO 1891 debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); 1892 if (!is_8bit(cosa) && (status & SR_TX_RDY)) 1893 debug_data_cmd(cosa, DRIVER_RX_READY); 1894#endif 1895 spin_unlock_irqrestore(&cosa->lock, flags); 1896} 1897 1898static inline void eot_interrupt(struct cosa_data *cosa, int status) 1899{ 1900 unsigned long flags, flags1; 1901 spin_lock_irqsave(&cosa->lock, flags); 1902 flags1 = claim_dma_lock(); 1903 disable_dma(cosa->dma); 1904 clear_dma_ff(cosa->dma); 1905 release_dma_lock(flags1); 1906 if (test_bit(TXBIT, &cosa->rxtx)) { 1907 struct channel_data *chan = cosa->chan+cosa->txchan; 1908 if (chan->tx_done) 1909 if (chan->tx_done(chan, cosa->txsize)) 1910 clear_bit(chan->num, &cosa->txbitmap); 1911 } else if (test_bit(RXBIT, &cosa->rxtx)) { 1912#ifdef DEBUG_DATA 1913 { 1914 int i; 1915 pr_info("cosa%dc%d: done rx(0x%x)", 1916 cosa->num, cosa->rxchan->num, cosa->rxsize); 1917 for (i=0; i<cosa->rxsize; i++) 1918 pr_cont(" %02x", cosa->rxbuf[i]&0xff); 1919 pr_cont("\n"); 1920 } 1921#endif 1922 /* Packet for unknown channel? */ 1923 if (cosa->rxbuf == cosa->bouncebuf) 1924 goto out; 1925 if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize)) 1926 memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize); 1927 if (cosa->rxchan->rx_done) 1928 if (cosa->rxchan->rx_done(cosa->rxchan)) 1929 clear_bit(cosa->rxchan->num, &cosa->rxbitmap); 1930 } else { 1931 pr_notice("cosa%d: unexpected EOT interrupt\n", cosa->num); 1932 } 1933 /* 1934 * Clear the RXBIT, TXBIT and IRQBIT (the latest should be 1935 * cleared anyway). We should do it as soon as possible 1936 * so that we can tell the COSA we are done and to give it a time 1937 * for recovery. 1938 */ 1939out: 1940 cosa->rxtx = 0; 1941 put_driver_status_nolock(cosa); 1942 spin_unlock_irqrestore(&cosa->lock, flags); 1943} 1944 1945static irqreturn_t cosa_interrupt(int irq, void *cosa_) 1946{ 1947 unsigned status; 1948 int count = 0; 1949 struct cosa_data *cosa = cosa_; 1950again: 1951 status = cosa_getstatus(cosa); 1952#ifdef DEBUG_IRQS 1953 pr_info("cosa%d: got IRQ, status 0x%02x\n", cosa->num, status & 0xff); 1954#endif 1955#ifdef DEBUG_IO 1956 debug_status_in(cosa, status); 1957#endif 1958 switch (status & SR_CMD_FROM_SRP_MASK) { 1959 case SR_DOWN_REQUEST: 1960 tx_interrupt(cosa, status); 1961 break; 1962 case SR_UP_REQUEST: 1963 rx_interrupt(cosa, status); 1964 break; 1965 case SR_END_OF_TRANSFER: 1966 eot_interrupt(cosa, status); 1967 break; 1968 default: 1969 /* We may be too fast for SRP. Try to wait a bit more. */ 1970 if (count++ < 100) { 1971 udelay(100); 1972 goto again; 1973 } 1974 pr_info("cosa%d: unknown status 0x%02x in IRQ after %d retries\n", 1975 cosa->num, status & 0xff, count); 1976 } 1977#ifdef DEBUG_IRQS 1978 if (count) 1979 pr_info("%s: %d-times got unknown status in IRQ\n", 1980 cosa->name, count); 1981 else 1982 pr_info("%s: returning from IRQ\n", cosa->name); 1983#endif 1984 return IRQ_HANDLED; 1985} 1986 1987 1988/* ---------- I/O debugging routines ---------- */ 1989/* 1990 * These routines can be used to monitor COSA/SRP I/O and to printk() 1991 * the data being transferred on the data and status I/O port in a 1992 * readable way. 1993 */ 1994 1995#ifdef DEBUG_IO 1996static void debug_status_in(struct cosa_data *cosa, int status) 1997{ 1998 char *s; 1999 switch (status & SR_CMD_FROM_SRP_MASK) { 2000 case SR_UP_REQUEST: 2001 s = "RX_REQ"; 2002 break; 2003 case SR_DOWN_REQUEST: 2004 s = "TX_REQ"; 2005 break; 2006 case SR_END_OF_TRANSFER: 2007 s = "ET_REQ"; 2008 break; 2009 default: 2010 s = "NO_REQ"; 2011 break; 2012 } 2013 pr_info("%s: IO: status -> 0x%02x (%s%s%s%s)\n", 2014 cosa->name, 2015 status, 2016 status & SR_USR_RQ ? "USR_RQ|" : "", 2017 status & SR_TX_RDY ? "TX_RDY|" : "", 2018 status & SR_RX_RDY ? "RX_RDY|" : "", 2019 s); 2020} 2021 2022static void debug_status_out(struct cosa_data *cosa, int status) 2023{ 2024 pr_info("%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n", 2025 cosa->name, 2026 status, 2027 status & SR_RX_DMA_ENA ? "RXDMA|" : "!rxdma|", 2028 status & SR_TX_DMA_ENA ? "TXDMA|" : "!txdma|", 2029 status & SR_RST ? "RESET|" : "", 2030 status & SR_USR_INT_ENA ? "USRINT|" : "!usrint|", 2031 status & SR_TX_INT_ENA ? "TXINT|" : "!txint|", 2032 status & SR_RX_INT_ENA ? "RXINT" : "!rxint"); 2033} 2034 2035static void debug_data_in(struct cosa_data *cosa, int data) 2036{ 2037 pr_info("%s: IO: data -> 0x%04x\n", cosa->name, data); 2038} 2039 2040static void debug_data_out(struct cosa_data *cosa, int data) 2041{ 2042 pr_info("%s: IO: data <- 0x%04x\n", cosa->name, data); 2043} 2044 2045static void debug_data_cmd(struct cosa_data *cosa, int data) 2046{ 2047 pr_info("%s: IO: data <- 0x%04x (%s|%s)\n", 2048 cosa->name, data, 2049 data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy", 2050 data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy"); 2051} 2052#endif 2053 2054/* EOF -- this file has not been truncated */ 2055