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 chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL); 799 if (chan->rxdata == NULL) { 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 kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA); 878 if (kbuf == NULL) { 879 up(&chan->wsem); 880 return -ENOMEM; 881 } 882 if (copy_from_user(kbuf, buf, count)) { 883 up(&chan->wsem); 884 kfree(kbuf); 885 return -EFAULT; 886 } 887 chan->tx_status=0; 888 cosa_start_tx(chan, kbuf, count); 889 890 spin_lock_irqsave(&cosa->lock, flags); 891 add_wait_queue(&chan->txwaitq, &wait); 892 while (!chan->tx_status) { 893 current->state = TASK_INTERRUPTIBLE; 894 spin_unlock_irqrestore(&cosa->lock, flags); 895 schedule(); 896 spin_lock_irqsave(&cosa->lock, flags); 897 if (signal_pending(current) && chan->tx_status == 0) { 898 chan->tx_status = 1; 899 remove_wait_queue(&chan->txwaitq, &wait); 900 current->state = TASK_RUNNING; 901 chan->tx_status = 1; 902 spin_unlock_irqrestore(&cosa->lock, flags); 903 up(&chan->wsem); 904 return -ERESTARTSYS; 905 } 906 } 907 remove_wait_queue(&chan->txwaitq, &wait); 908 current->state = TASK_RUNNING; 909 up(&chan->wsem); 910 spin_unlock_irqrestore(&cosa->lock, flags); 911 kfree(kbuf); 912 return count; 913} 914 915static int chrdev_tx_done(struct channel_data *chan, int size) 916{ 917 if (chan->tx_status) { /* Writer was interrupted */ 918 kfree(chan->txbuf); 919 up(&chan->wsem); 920 } 921 chan->tx_status = 1; 922 wake_up_interruptible(&chan->txwaitq); 923 return 1; 924} 925 926static unsigned int cosa_poll(struct file *file, poll_table *poll) 927{ 928 pr_info("cosa_poll is here\n"); 929 return 0; 930} 931 932static int cosa_open(struct inode *inode, struct file *file) 933{ 934 struct cosa_data *cosa; 935 struct channel_data *chan; 936 unsigned long flags; 937 int n; 938 int ret = 0; 939 940 mutex_lock(&cosa_chardev_mutex); 941 if ((n=iminor(file_inode(file))>>CARD_MINOR_BITS) 942 >= nr_cards) { 943 ret = -ENODEV; 944 goto out; 945 } 946 cosa = cosa_cards+n; 947 948 if ((n=iminor(file_inode(file)) 949 & ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) { 950 ret = -ENODEV; 951 goto out; 952 } 953 chan = cosa->chan + n; 954 955 file->private_data = chan; 956 957 spin_lock_irqsave(&cosa->lock, flags); 958 959 if (chan->usage < 0) { /* in netdev mode */ 960 spin_unlock_irqrestore(&cosa->lock, flags); 961 ret = -EBUSY; 962 goto out; 963 } 964 cosa->usage++; 965 chan->usage++; 966 967 chan->tx_done = chrdev_tx_done; 968 chan->setup_rx = chrdev_setup_rx; 969 chan->rx_done = chrdev_rx_done; 970 spin_unlock_irqrestore(&cosa->lock, flags); 971out: 972 mutex_unlock(&cosa_chardev_mutex); 973 return ret; 974} 975 976static int cosa_release(struct inode *inode, struct file *file) 977{ 978 struct channel_data *channel = file->private_data; 979 struct cosa_data *cosa; 980 unsigned long flags; 981 982 cosa = channel->cosa; 983 spin_lock_irqsave(&cosa->lock, flags); 984 cosa->usage--; 985 channel->usage--; 986 spin_unlock_irqrestore(&cosa->lock, flags); 987 return 0; 988} 989 990#ifdef COSA_FASYNC_WORKING 991static struct fasync_struct *fasync[256] = { NULL, }; 992 993/* To be done ... */ 994static int cosa_fasync(struct inode *inode, struct file *file, int on) 995{ 996 int port = iminor(inode); 997 998 return fasync_helper(inode, file, on, &fasync[port]); 999} 1000#endif 1001 1002 1003/* ---------- Ioctls ---------- */ 1004 1005/* 1006 * Ioctl subroutines can safely be made inline, because they are called 1007 * only from cosa_ioctl(). 1008 */ 1009static inline int cosa_reset(struct cosa_data *cosa) 1010{ 1011 char idstring[COSA_MAX_ID_STRING]; 1012 if (cosa->usage > 1) 1013 pr_info("cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1014 cosa->num, cosa->usage); 1015 cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START); 1016 if (cosa_reset_and_read_id(cosa, idstring) < 0) { 1017 pr_notice("cosa%d: reset failed\n", cosa->num); 1018 return -EIO; 1019 } 1020 pr_info("cosa%d: resetting device: %s\n", cosa->num, idstring); 1021 cosa->firmware_status |= COSA_FW_RESET; 1022 return 0; 1023} 1024 1025/* High-level function to download data into COSA memory. Calls download() */ 1026static inline int cosa_download(struct cosa_data *cosa, void __user *arg) 1027{ 1028 struct cosa_download d; 1029 int i; 1030 1031 if (cosa->usage > 1) 1032 pr_info("%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1033 cosa->name, cosa->usage); 1034 if (!(cosa->firmware_status & COSA_FW_RESET)) { 1035 pr_notice("%s: reset the card first (status %d)\n", 1036 cosa->name, cosa->firmware_status); 1037 return -EPERM; 1038 } 1039 1040 if (copy_from_user(&d, arg, sizeof(d))) 1041 return -EFAULT; 1042 1043 if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE) 1044 return -EINVAL; 1045 if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE) 1046 return -EINVAL; 1047 1048 1049 /* If something fails, force the user to reset the card */ 1050 cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD); 1051 1052 i = download(cosa, d.code, d.len, d.addr); 1053 if (i < 0) { 1054 pr_notice("cosa%d: microcode download failed: %d\n", 1055 cosa->num, i); 1056 return -EIO; 1057 } 1058 pr_info("cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n", 1059 cosa->num, d.len, d.addr); 1060 cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD; 1061 return 0; 1062} 1063 1064/* High-level function to read COSA memory. Calls readmem() */ 1065static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg) 1066{ 1067 struct cosa_download d; 1068 int i; 1069 1070 if (cosa->usage > 1) 1071 pr_info("cosa%d: WARNING: readmem requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1072 cosa->num, cosa->usage); 1073 if (!(cosa->firmware_status & COSA_FW_RESET)) { 1074 pr_notice("%s: reset the card first (status %d)\n", 1075 cosa->name, cosa->firmware_status); 1076 return -EPERM; 1077 } 1078 1079 if (copy_from_user(&d, arg, sizeof(d))) 1080 return -EFAULT; 1081 1082 /* If something fails, force the user to reset the card */ 1083 cosa->firmware_status &= ~COSA_FW_RESET; 1084 1085 i = readmem(cosa, d.code, d.len, d.addr); 1086 if (i < 0) { 1087 pr_notice("cosa%d: reading memory failed: %d\n", cosa->num, i); 1088 return -EIO; 1089 } 1090 pr_info("cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n", 1091 cosa->num, d.len, d.addr); 1092 cosa->firmware_status |= COSA_FW_RESET; 1093 return 0; 1094} 1095 1096/* High-level function to start microcode. Calls startmicrocode(). */ 1097static inline int cosa_start(struct cosa_data *cosa, int address) 1098{ 1099 int i; 1100 1101 if (cosa->usage > 1) 1102 pr_info("cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1103 cosa->num, cosa->usage); 1104 1105 if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD)) 1106 != (COSA_FW_RESET|COSA_FW_DOWNLOAD)) { 1107 pr_notice("%s: download the microcode and/or reset the card first (status %d)\n", 1108 cosa->name, cosa->firmware_status); 1109 return -EPERM; 1110 } 1111 cosa->firmware_status &= ~COSA_FW_RESET; 1112 if ((i=startmicrocode(cosa, address)) < 0) { 1113 pr_notice("cosa%d: start microcode at 0x%04x failed: %d\n", 1114 cosa->num, address, i); 1115 return -EIO; 1116 } 1117 pr_info("cosa%d: starting microcode at 0x%04x\n", cosa->num, address); 1118 cosa->startaddr = address; 1119 cosa->firmware_status |= COSA_FW_START; 1120 return 0; 1121} 1122 1123/* Buffer of size at least COSA_MAX_ID_STRING is expected */ 1124static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string) 1125{ 1126 int l = strlen(cosa->id_string)+1; 1127 if (copy_to_user(string, cosa->id_string, l)) 1128 return -EFAULT; 1129 return l; 1130} 1131 1132/* Buffer of size at least COSA_MAX_ID_STRING is expected */ 1133static inline int cosa_gettype(struct cosa_data *cosa, char __user *string) 1134{ 1135 int l = strlen(cosa->type)+1; 1136 if (copy_to_user(string, cosa->type, l)) 1137 return -EFAULT; 1138 return l; 1139} 1140 1141static int cosa_ioctl_common(struct cosa_data *cosa, 1142 struct channel_data *channel, unsigned int cmd, unsigned long arg) 1143{ 1144 void __user *argp = (void __user *)arg; 1145 switch (cmd) { 1146 case COSAIORSET: /* Reset the device */ 1147 if (!capable(CAP_NET_ADMIN)) 1148 return -EACCES; 1149 return cosa_reset(cosa); 1150 case COSAIOSTRT: /* Start the firmware */ 1151 if (!capable(CAP_SYS_RAWIO)) 1152 return -EACCES; 1153 return cosa_start(cosa, arg); 1154 case COSAIODOWNLD: /* Download the firmware */ 1155 if (!capable(CAP_SYS_RAWIO)) 1156 return -EACCES; 1157 1158 return cosa_download(cosa, argp); 1159 case COSAIORMEM: 1160 if (!capable(CAP_SYS_RAWIO)) 1161 return -EACCES; 1162 return cosa_readmem(cosa, argp); 1163 case COSAIORTYPE: 1164 return cosa_gettype(cosa, argp); 1165 case COSAIORIDSTR: 1166 return cosa_getidstr(cosa, argp); 1167 case COSAIONRCARDS: 1168 return nr_cards; 1169 case COSAIONRCHANS: 1170 return cosa->nchannels; 1171 case COSAIOBMSET: 1172 if (!capable(CAP_SYS_RAWIO)) 1173 return -EACCES; 1174 if (is_8bit(cosa)) 1175 return -EINVAL; 1176 if (arg != COSA_BM_OFF && arg != COSA_BM_ON) 1177 return -EINVAL; 1178 cosa->busmaster = arg; 1179 return 0; 1180 case COSAIOBMGET: 1181 return cosa->busmaster; 1182 } 1183 return -ENOIOCTLCMD; 1184} 1185 1186static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1187{ 1188 int rv; 1189 struct channel_data *chan = dev_to_chan(dev); 1190 rv = cosa_ioctl_common(chan->cosa, chan, cmd, 1191 (unsigned long)ifr->ifr_data); 1192 if (rv != -ENOIOCTLCMD) 1193 return rv; 1194 return hdlc_ioctl(dev, ifr, cmd); 1195} 1196 1197static long cosa_chardev_ioctl(struct file *file, unsigned int cmd, 1198 unsigned long arg) 1199{ 1200 struct channel_data *channel = file->private_data; 1201 struct cosa_data *cosa; 1202 long ret; 1203 1204 mutex_lock(&cosa_chardev_mutex); 1205 cosa = channel->cosa; 1206 ret = cosa_ioctl_common(cosa, channel, cmd, arg); 1207 mutex_unlock(&cosa_chardev_mutex); 1208 return ret; 1209} 1210 1211 1212/*---------- HW layer interface ---------- */ 1213 1214/* 1215 * The higher layer can bind itself to the HW layer by setting the callbacks 1216 * in the channel_data structure and by using these routines. 1217 */ 1218static void cosa_enable_rx(struct channel_data *chan) 1219{ 1220 struct cosa_data *cosa = chan->cosa; 1221 1222 if (!test_and_set_bit(chan->num, &cosa->rxbitmap)) 1223 put_driver_status(cosa); 1224} 1225 1226static void cosa_disable_rx(struct channel_data *chan) 1227{ 1228 struct cosa_data *cosa = chan->cosa; 1229 1230 if (test_and_clear_bit(chan->num, &cosa->rxbitmap)) 1231 put_driver_status(cosa); 1232} 1233 1234/* 1235 * FIXME: This routine probably should check for cosa_start_tx() called when 1236 * the previous transmit is still unfinished. In this case the non-zero 1237 * return value should indicate to the caller that the queuing(sp?) up 1238 * the transmit has failed. 1239 */ 1240static int cosa_start_tx(struct channel_data *chan, char *buf, int len) 1241{ 1242 struct cosa_data *cosa = chan->cosa; 1243 unsigned long flags; 1244#ifdef DEBUG_DATA 1245 int i; 1246 1247 pr_info("cosa%dc%d: starting tx(0x%x)", 1248 chan->cosa->num, chan->num, len); 1249 for (i=0; i<len; i++) 1250 pr_cont(" %02x", buf[i]&0xff); 1251 pr_cont("\n"); 1252#endif 1253 spin_lock_irqsave(&cosa->lock, flags); 1254 chan->txbuf = buf; 1255 chan->txsize = len; 1256 if (len > COSA_MTU) 1257 chan->txsize = COSA_MTU; 1258 spin_unlock_irqrestore(&cosa->lock, flags); 1259 1260 /* Tell the firmware we are ready */ 1261 set_bit(chan->num, &cosa->txbitmap); 1262 put_driver_status(cosa); 1263 1264 return 0; 1265} 1266 1267static void put_driver_status(struct cosa_data *cosa) 1268{ 1269 unsigned long flags; 1270 int status; 1271 1272 spin_lock_irqsave(&cosa->lock, flags); 1273 1274 status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) 1275 | (cosa->txbitmap ? DRIVER_TX_READY : 0) 1276 | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) 1277 &DRIVER_TXMAP_MASK : 0); 1278 if (!cosa->rxtx) { 1279 if (cosa->rxbitmap|cosa->txbitmap) { 1280 if (!cosa->enabled) { 1281 cosa_putstatus(cosa, SR_RX_INT_ENA); 1282#ifdef DEBUG_IO 1283 debug_status_out(cosa, SR_RX_INT_ENA); 1284#endif 1285 cosa->enabled = 1; 1286 } 1287 } else if (cosa->enabled) { 1288 cosa->enabled = 0; 1289 cosa_putstatus(cosa, 0); 1290#ifdef DEBUG_IO 1291 debug_status_out(cosa, 0); 1292#endif 1293 } 1294 cosa_putdata8(cosa, status); 1295#ifdef DEBUG_IO 1296 debug_data_cmd(cosa, status); 1297#endif 1298 } 1299 spin_unlock_irqrestore(&cosa->lock, flags); 1300} 1301 1302static void put_driver_status_nolock(struct cosa_data *cosa) 1303{ 1304 int status; 1305 1306 status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) 1307 | (cosa->txbitmap ? DRIVER_TX_READY : 0) 1308 | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) 1309 &DRIVER_TXMAP_MASK : 0); 1310 1311 if (cosa->rxbitmap|cosa->txbitmap) { 1312 cosa_putstatus(cosa, SR_RX_INT_ENA); 1313#ifdef DEBUG_IO 1314 debug_status_out(cosa, SR_RX_INT_ENA); 1315#endif 1316 cosa->enabled = 1; 1317 } else { 1318 cosa_putstatus(cosa, 0); 1319#ifdef DEBUG_IO 1320 debug_status_out(cosa, 0); 1321#endif 1322 cosa->enabled = 0; 1323 } 1324 cosa_putdata8(cosa, status); 1325#ifdef DEBUG_IO 1326 debug_data_cmd(cosa, status); 1327#endif 1328} 1329 1330/* 1331 * The "kickme" function: When the DMA times out, this is called to 1332 * clean up the driver status. 1333 * FIXME: Preliminary support, the interface is probably wrong. 1334 */ 1335static void cosa_kick(struct cosa_data *cosa) 1336{ 1337 unsigned long flags, flags1; 1338 char *s = "(probably) IRQ"; 1339 1340 if (test_bit(RXBIT, &cosa->rxtx)) 1341 s = "RX DMA"; 1342 if (test_bit(TXBIT, &cosa->rxtx)) 1343 s = "TX DMA"; 1344 1345 pr_info("%s: %s timeout - restarting\n", cosa->name, s); 1346 spin_lock_irqsave(&cosa->lock, flags); 1347 cosa->rxtx = 0; 1348 1349 flags1 = claim_dma_lock(); 1350 disable_dma(cosa->dma); 1351 clear_dma_ff(cosa->dma); 1352 release_dma_lock(flags1); 1353 1354 /* FIXME: Anything else? */ 1355 udelay(100); 1356 cosa_putstatus(cosa, 0); 1357 udelay(100); 1358 (void) cosa_getdata8(cosa); 1359 udelay(100); 1360 cosa_putdata8(cosa, 0); 1361 udelay(100); 1362 put_driver_status_nolock(cosa); 1363 spin_unlock_irqrestore(&cosa->lock, flags); 1364} 1365 1366/* 1367 * Check if the whole buffer is DMA-able. It means it is below the 16M of 1368 * physical memory and doesn't span the 64k boundary. For now it seems 1369 * SKB's never do this, but we'll check this anyway. 1370 */ 1371static int cosa_dma_able(struct channel_data *chan, char *buf, int len) 1372{ 1373 static int count; 1374 unsigned long b = (unsigned long)buf; 1375 if (b+len >= MAX_DMA_ADDRESS) 1376 return 0; 1377 if ((b^ (b+len)) & 0x10000) { 1378 if (count++ < 5) 1379 pr_info("%s: packet spanning a 64k boundary\n", 1380 chan->name); 1381 return 0; 1382 } 1383 return 1; 1384} 1385 1386 1387/* ---------- The SRP/COSA ROM monitor functions ---------- */ 1388 1389/* 1390 * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=", 1391 * drivers need to say 4-digit hex number meaning start address of the microcode 1392 * separated by a single space. Monitor replies by saying " =". Now driver 1393 * has to write 4-digit hex number meaning the last byte address ended 1394 * by a single space. Monitor has to reply with a space. Now the download 1395 * begins. After the download monitor replies with "\r\n." (CR LF dot). 1396 */ 1397static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address) 1398{ 1399 int i; 1400 1401 if (put_wait_data(cosa, 'w') == -1) return -1; 1402 if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;} 1403 if (get_wait_data(cosa) != '=') return -3; 1404 1405 if (puthexnumber(cosa, address) < 0) return -4; 1406 if (put_wait_data(cosa, ' ') == -1) return -10; 1407 if (get_wait_data(cosa) != ' ') return -11; 1408 if (get_wait_data(cosa) != '=') return -12; 1409 1410 if (puthexnumber(cosa, address+length-1) < 0) return -13; 1411 if (put_wait_data(cosa, ' ') == -1) return -18; 1412 if (get_wait_data(cosa) != ' ') return -19; 1413 1414 while (length--) { 1415 char c; 1416#ifndef SRP_DOWNLOAD_AT_BOOT 1417 if (get_user(c, microcode)) 1418 return -23; /* ??? */ 1419#else 1420 c = *microcode; 1421#endif 1422 if (put_wait_data(cosa, c) == -1) 1423 return -20; 1424 microcode++; 1425 } 1426 1427 if (get_wait_data(cosa) != '\r') return -21; 1428 if (get_wait_data(cosa) != '\n') return -22; 1429 if (get_wait_data(cosa) != '.') return -23; 1430#if 0 1431 printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num); 1432#endif 1433 return 0; 1434} 1435 1436 1437/* 1438 * Starting microcode is done via the "g" command of the SRP monitor. 1439 * The chat should be the following: "g" "g=" "<addr><CR>" 1440 * "<CR><CR><LF><CR><LF>". 1441 */ 1442static int startmicrocode(struct cosa_data *cosa, int address) 1443{ 1444 if (put_wait_data(cosa, 'g') == -1) return -1; 1445 if (get_wait_data(cosa) != 'g') return -2; 1446 if (get_wait_data(cosa) != '=') return -3; 1447 1448 if (puthexnumber(cosa, address) < 0) return -4; 1449 if (put_wait_data(cosa, '\r') == -1) return -5; 1450 1451 if (get_wait_data(cosa) != '\r') return -6; 1452 if (get_wait_data(cosa) != '\r') return -7; 1453 if (get_wait_data(cosa) != '\n') return -8; 1454 if (get_wait_data(cosa) != '\r') return -9; 1455 if (get_wait_data(cosa) != '\n') return -10; 1456#if 0 1457 printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num); 1458#endif 1459 return 0; 1460} 1461 1462/* 1463 * Reading memory is done via the "r" command of the SRP monitor. 1464 * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " " 1465 * Then driver can read the data and the conversation is finished 1466 * by SRP monitor sending "<CR><LF>." (dot at the end). 1467 * 1468 * This routine is not needed during the normal operation and serves 1469 * for debugging purposes only. 1470 */ 1471static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address) 1472{ 1473 if (put_wait_data(cosa, 'r') == -1) return -1; 1474 if ((get_wait_data(cosa)) != 'r') return -2; 1475 if ((get_wait_data(cosa)) != '=') return -3; 1476 1477 if (puthexnumber(cosa, address) < 0) return -4; 1478 if (put_wait_data(cosa, ' ') == -1) return -5; 1479 if (get_wait_data(cosa) != ' ') return -6; 1480 if (get_wait_data(cosa) != '=') return -7; 1481 1482 if (puthexnumber(cosa, address+length-1) < 0) return -8; 1483 if (put_wait_data(cosa, ' ') == -1) return -9; 1484 if (get_wait_data(cosa) != ' ') return -10; 1485 1486 while (length--) { 1487 char c; 1488 int i; 1489 if ((i=get_wait_data(cosa)) == -1) { 1490 pr_info("0x%04x bytes remaining\n", length); 1491 return -11; 1492 } 1493 c=i; 1494#if 1 1495 if (put_user(c, microcode)) 1496 return -23; /* ??? */ 1497#else 1498 *microcode = c; 1499#endif 1500 microcode++; 1501 } 1502 1503 if (get_wait_data(cosa) != '\r') return -21; 1504 if (get_wait_data(cosa) != '\n') return -22; 1505 if (get_wait_data(cosa) != '.') return -23; 1506#if 0 1507 printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num); 1508#endif 1509 return 0; 1510} 1511 1512/* 1513 * This function resets the device and reads the initial prompt 1514 * of the device's ROM monitor. 1515 */ 1516static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring) 1517{ 1518 int i=0, id=0, prev=0, curr=0; 1519 1520 /* Reset the card ... */ 1521 cosa_putstatus(cosa, 0); 1522 cosa_getdata8(cosa); 1523 cosa_putstatus(cosa, SR_RST); 1524 msleep(500); 1525 /* Disable all IRQs from the card */ 1526 cosa_putstatus(cosa, 0); 1527 1528 /* 1529 * Try to read the ID string. The card then prints out the 1530 * identification string ended by the "\n\x2e". 1531 * 1532 * The following loop is indexed through i (instead of id) 1533 * to avoid looping forever when for any reason 1534 * the port returns '\r', '\n' or '\x2e' permanently. 1535 */ 1536 for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) { 1537 if ((curr = get_wait_data(cosa)) == -1) { 1538 return -1; 1539 } 1540 curr &= 0xff; 1541 if (curr != '\r' && curr != '\n' && curr != 0x2e) 1542 idstring[id++] = curr; 1543 if (curr == 0x2e && prev == '\n') 1544 break; 1545 } 1546 /* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */ 1547 idstring[id] = '\0'; 1548 return id; 1549} 1550 1551 1552/* ---------- Auxiliary routines for COSA/SRP monitor ---------- */ 1553 1554/* 1555 * This routine gets the data byte from the card waiting for the SR_RX_RDY 1556 * bit to be set in a loop. It should be used in the exceptional cases 1557 * only (for example when resetting the card or downloading the firmware. 1558 */ 1559static int get_wait_data(struct cosa_data *cosa) 1560{ 1561 int retries = 1000; 1562 1563 while (--retries) { 1564 /* read data and return them */ 1565 if (cosa_getstatus(cosa) & SR_RX_RDY) { 1566 short r; 1567 r = cosa_getdata8(cosa); 1568#if 0 1569 pr_info("get_wait_data returning after %d retries\n", 1570 999-retries); 1571#endif 1572 return r; 1573 } 1574 /* sleep if not ready to read */ 1575 schedule_timeout_interruptible(1); 1576 } 1577 pr_info("timeout in get_wait_data (status 0x%x)\n", 1578 cosa_getstatus(cosa)); 1579 return -1; 1580} 1581 1582/* 1583 * This routine puts the data byte to the card waiting for the SR_TX_RDY 1584 * bit to be set in a loop. It should be used in the exceptional cases 1585 * only (for example when resetting the card or downloading the firmware). 1586 */ 1587static int put_wait_data(struct cosa_data *cosa, int data) 1588{ 1589 int retries = 1000; 1590 while (--retries) { 1591 /* read data and return them */ 1592 if (cosa_getstatus(cosa) & SR_TX_RDY) { 1593 cosa_putdata8(cosa, data); 1594#if 0 1595 pr_info("Putdata: %d retries\n", 999-retries); 1596#endif 1597 return 0; 1598 } 1599#if 0 1600 /* sleep if not ready to read */ 1601 schedule_timeout_interruptible(1); 1602#endif 1603 } 1604 pr_info("cosa%d: timeout in put_wait_data (status 0x%x)\n", 1605 cosa->num, cosa_getstatus(cosa)); 1606 return -1; 1607} 1608 1609/* 1610 * The following routine puts the hexadecimal number into the SRP monitor 1611 * and verifies the proper echo of the sent bytes. Returns 0 on success, 1612 * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed, 1613 * (-2,-4,-6,-8) means that reading echo failed. 1614 */ 1615static int puthexnumber(struct cosa_data *cosa, int number) 1616{ 1617 char temp[5]; 1618 int i; 1619 1620 /* Well, I should probably replace this by something faster. */ 1621 sprintf(temp, "%04X", number); 1622 for (i=0; i<4; i++) { 1623 if (put_wait_data(cosa, temp[i]) == -1) { 1624 pr_notice("cosa%d: puthexnumber failed to write byte %d\n", 1625 cosa->num, i); 1626 return -1-2*i; 1627 } 1628 if (get_wait_data(cosa) != temp[i]) { 1629 pr_notice("cosa%d: puthexhumber failed to read echo of byte %d\n", 1630 cosa->num, i); 1631 return -2-2*i; 1632 } 1633 } 1634 return 0; 1635} 1636 1637 1638/* ---------- Interrupt routines ---------- */ 1639 1640/* 1641 * There are three types of interrupt: 1642 * At the beginning of transmit - this handled is in tx_interrupt(), 1643 * at the beginning of receive - it is in rx_interrupt() and 1644 * at the end of transmit/receive - it is the eot_interrupt() function. 1645 * These functions are multiplexed by cosa_interrupt() according to the 1646 * COSA status byte. I have moved the rx/tx/eot interrupt handling into 1647 * separate functions to make it more readable. These functions are inline, 1648 * so there should be no overhead of function call. 1649 * 1650 * In the COSA bus-master mode, we need to tell the card the address of a 1651 * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait. 1652 * It's time to use the bottom half :-( 1653 */ 1654 1655/* 1656 * Transmit interrupt routine - called when COSA is willing to obtain 1657 * data from the OS. The most tricky part of the routine is selection 1658 * of channel we (OS) want to send packet for. For SRP we should probably 1659 * use the round-robin approach. The newer COSA firmwares have a simple 1660 * flow-control - in the status word has bits 2 and 3 set to 1 means that the 1661 * channel 0 or 1 doesn't want to receive data. 1662 * 1663 * It seems there is a bug in COSA firmware (need to trace it further): 1664 * When the driver status says that the kernel has no more data for transmit 1665 * (e.g. at the end of TX DMA) and then the kernel changes its mind 1666 * (e.g. new packet is queued to hard_start_xmit()), the card issues 1667 * the TX interrupt but does not mark the channel as ready-to-transmit. 1668 * The fix seems to be to push the packet to COSA despite its request. 1669 * We first try to obey the card's opinion, and then fall back to forced TX. 1670 */ 1671static inline void tx_interrupt(struct cosa_data *cosa, int status) 1672{ 1673 unsigned long flags, flags1; 1674#ifdef DEBUG_IRQS 1675 pr_info("cosa%d: SR_DOWN_REQUEST status=0x%04x\n", cosa->num, status); 1676#endif 1677 spin_lock_irqsave(&cosa->lock, flags); 1678 set_bit(TXBIT, &cosa->rxtx); 1679 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1680 /* flow control, see the comment above */ 1681 int i=0; 1682 if (!cosa->txbitmap) { 1683 pr_warn("%s: No channel wants data in TX IRQ. Expect DMA timeout.\n", 1684 cosa->name); 1685 put_driver_status_nolock(cosa); 1686 clear_bit(TXBIT, &cosa->rxtx); 1687 spin_unlock_irqrestore(&cosa->lock, flags); 1688 return; 1689 } 1690 while (1) { 1691 cosa->txchan++; 1692 i++; 1693 if (cosa->txchan >= cosa->nchannels) 1694 cosa->txchan = 0; 1695 if (!(cosa->txbitmap & (1<<cosa->txchan))) 1696 continue; 1697 if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT))) 1698 break; 1699 /* in second pass, accept first ready-to-TX channel */ 1700 if (i > cosa->nchannels) { 1701 /* Can be safely ignored */ 1702#ifdef DEBUG_IRQS 1703 printk(KERN_DEBUG "%s: Forcing TX " 1704 "to not-ready channel %d\n", 1705 cosa->name, cosa->txchan); 1706#endif 1707 break; 1708 } 1709 } 1710 1711 cosa->txsize = cosa->chan[cosa->txchan].txsize; 1712 if (cosa_dma_able(cosa->chan+cosa->txchan, 1713 cosa->chan[cosa->txchan].txbuf, cosa->txsize)) { 1714 cosa->txbuf = cosa->chan[cosa->txchan].txbuf; 1715 } else { 1716 memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf, 1717 cosa->txsize); 1718 cosa->txbuf = cosa->bouncebuf; 1719 } 1720 } 1721 1722 if (is_8bit(cosa)) { 1723 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1724 cosa_putstatus(cosa, SR_TX_INT_ENA); 1725 cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)| 1726 ((cosa->txsize >> 8) & 0x1f)); 1727#ifdef DEBUG_IO 1728 debug_status_out(cosa, SR_TX_INT_ENA); 1729 debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)| 1730 ((cosa->txsize >> 8) & 0x1f)); 1731 debug_data_in(cosa, cosa_getdata8(cosa)); 1732#else 1733 cosa_getdata8(cosa); 1734#endif 1735 set_bit(IRQBIT, &cosa->rxtx); 1736 spin_unlock_irqrestore(&cosa->lock, flags); 1737 return; 1738 } else { 1739 clear_bit(IRQBIT, &cosa->rxtx); 1740 cosa_putstatus(cosa, 0); 1741 cosa_putdata8(cosa, cosa->txsize&0xff); 1742#ifdef DEBUG_IO 1743 debug_status_out(cosa, 0); 1744 debug_data_out(cosa, cosa->txsize&0xff); 1745#endif 1746 } 1747 } else { 1748 cosa_putstatus(cosa, SR_TX_INT_ENA); 1749 cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000) 1750 | (cosa->txsize & 0x1fff)); 1751#ifdef DEBUG_IO 1752 debug_status_out(cosa, SR_TX_INT_ENA); 1753 debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000) 1754 | (cosa->txsize & 0x1fff)); 1755 debug_data_in(cosa, cosa_getdata8(cosa)); 1756 debug_status_out(cosa, 0); 1757#else 1758 cosa_getdata8(cosa); 1759#endif 1760 cosa_putstatus(cosa, 0); 1761 } 1762 1763 if (cosa->busmaster) { 1764 unsigned long addr = virt_to_bus(cosa->txbuf); 1765 int count=0; 1766 pr_info("busmaster IRQ\n"); 1767 while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { 1768 count++; 1769 udelay(10); 1770 if (count > 1000) break; 1771 } 1772 pr_info("status %x\n", cosa_getstatus(cosa)); 1773 pr_info("ready after %d loops\n", count); 1774 cosa_putdata16(cosa, (addr >> 16)&0xffff); 1775 1776 count = 0; 1777 while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { 1778 count++; 1779 if (count > 1000) break; 1780 udelay(10); 1781 } 1782 pr_info("ready after %d loops\n", count); 1783 cosa_putdata16(cosa, addr &0xffff); 1784 flags1 = claim_dma_lock(); 1785 set_dma_mode(cosa->dma, DMA_MODE_CASCADE); 1786 enable_dma(cosa->dma); 1787 release_dma_lock(flags1); 1788 } else { 1789 /* start the DMA */ 1790 flags1 = claim_dma_lock(); 1791 disable_dma(cosa->dma); 1792 clear_dma_ff(cosa->dma); 1793 set_dma_mode(cosa->dma, DMA_MODE_WRITE); 1794 set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf)); 1795 set_dma_count(cosa->dma, cosa->txsize); 1796 enable_dma(cosa->dma); 1797 release_dma_lock(flags1); 1798 } 1799 cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); 1800#ifdef DEBUG_IO 1801 debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); 1802#endif 1803 spin_unlock_irqrestore(&cosa->lock, flags); 1804} 1805 1806static inline void rx_interrupt(struct cosa_data *cosa, int status) 1807{ 1808 unsigned long flags; 1809#ifdef DEBUG_IRQS 1810 pr_info("cosa%d: SR_UP_REQUEST\n", cosa->num); 1811#endif 1812 1813 spin_lock_irqsave(&cosa->lock, flags); 1814 set_bit(RXBIT, &cosa->rxtx); 1815 1816 if (is_8bit(cosa)) { 1817 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1818 set_bit(IRQBIT, &cosa->rxtx); 1819 put_driver_status_nolock(cosa); 1820 cosa->rxsize = cosa_getdata8(cosa) <<8; 1821#ifdef DEBUG_IO 1822 debug_data_in(cosa, cosa->rxsize >> 8); 1823#endif 1824 spin_unlock_irqrestore(&cosa->lock, flags); 1825 return; 1826 } else { 1827 clear_bit(IRQBIT, &cosa->rxtx); 1828 cosa->rxsize |= cosa_getdata8(cosa) & 0xff; 1829#ifdef DEBUG_IO 1830 debug_data_in(cosa, cosa->rxsize & 0xff); 1831#endif 1832#if 0 1833 pr_info("cosa%d: receive rxsize = (0x%04x)\n", 1834 cosa->num, cosa->rxsize); 1835#endif 1836 } 1837 } else { 1838 cosa->rxsize = cosa_getdata16(cosa); 1839#ifdef DEBUG_IO 1840 debug_data_in(cosa, cosa->rxsize); 1841#endif 1842#if 0 1843 pr_info("cosa%d: receive rxsize = (0x%04x)\n", 1844 cosa->num, cosa->rxsize); 1845#endif 1846 } 1847 if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) { 1848 pr_warn("%s: rx for unknown channel (0x%04x)\n", 1849 cosa->name, cosa->rxsize); 1850 spin_unlock_irqrestore(&cosa->lock, flags); 1851 goto reject; 1852 } 1853 cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13); 1854 cosa->rxsize &= 0x1fff; 1855 spin_unlock_irqrestore(&cosa->lock, flags); 1856 1857 cosa->rxbuf = NULL; 1858 if (cosa->rxchan->setup_rx) 1859 cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize); 1860 1861 if (!cosa->rxbuf) { 1862reject: /* Reject the packet */ 1863 pr_info("cosa%d: rejecting packet on channel %d\n", 1864 cosa->num, cosa->rxchan->num); 1865 cosa->rxbuf = cosa->bouncebuf; 1866 } 1867 1868 /* start the DMA */ 1869 flags = claim_dma_lock(); 1870 disable_dma(cosa->dma); 1871 clear_dma_ff(cosa->dma); 1872 set_dma_mode(cosa->dma, DMA_MODE_READ); 1873 if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) { 1874 set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf)); 1875 } else { 1876 set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf)); 1877 } 1878 set_dma_count(cosa->dma, (cosa->rxsize&0x1fff)); 1879 enable_dma(cosa->dma); 1880 release_dma_lock(flags); 1881 spin_lock_irqsave(&cosa->lock, flags); 1882 cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); 1883 if (!is_8bit(cosa) && (status & SR_TX_RDY)) 1884 cosa_putdata8(cosa, DRIVER_RX_READY); 1885#ifdef DEBUG_IO 1886 debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); 1887 if (!is_8bit(cosa) && (status & SR_TX_RDY)) 1888 debug_data_cmd(cosa, DRIVER_RX_READY); 1889#endif 1890 spin_unlock_irqrestore(&cosa->lock, flags); 1891} 1892 1893static inline void eot_interrupt(struct cosa_data *cosa, int status) 1894{ 1895 unsigned long flags, flags1; 1896 spin_lock_irqsave(&cosa->lock, flags); 1897 flags1 = claim_dma_lock(); 1898 disable_dma(cosa->dma); 1899 clear_dma_ff(cosa->dma); 1900 release_dma_lock(flags1); 1901 if (test_bit(TXBIT, &cosa->rxtx)) { 1902 struct channel_data *chan = cosa->chan+cosa->txchan; 1903 if (chan->tx_done) 1904 if (chan->tx_done(chan, cosa->txsize)) 1905 clear_bit(chan->num, &cosa->txbitmap); 1906 } else if (test_bit(RXBIT, &cosa->rxtx)) { 1907#ifdef DEBUG_DATA 1908 { 1909 int i; 1910 pr_info("cosa%dc%d: done rx(0x%x)", 1911 cosa->num, cosa->rxchan->num, cosa->rxsize); 1912 for (i=0; i<cosa->rxsize; i++) 1913 pr_cont(" %02x", cosa->rxbuf[i]&0xff); 1914 pr_cont("\n"); 1915 } 1916#endif 1917 /* Packet for unknown channel? */ 1918 if (cosa->rxbuf == cosa->bouncebuf) 1919 goto out; 1920 if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize)) 1921 memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize); 1922 if (cosa->rxchan->rx_done) 1923 if (cosa->rxchan->rx_done(cosa->rxchan)) 1924 clear_bit(cosa->rxchan->num, &cosa->rxbitmap); 1925 } else { 1926 pr_notice("cosa%d: unexpected EOT interrupt\n", cosa->num); 1927 } 1928 /* 1929 * Clear the RXBIT, TXBIT and IRQBIT (the latest should be 1930 * cleared anyway). We should do it as soon as possible 1931 * so that we can tell the COSA we are done and to give it a time 1932 * for recovery. 1933 */ 1934out: 1935 cosa->rxtx = 0; 1936 put_driver_status_nolock(cosa); 1937 spin_unlock_irqrestore(&cosa->lock, flags); 1938} 1939 1940static irqreturn_t cosa_interrupt(int irq, void *cosa_) 1941{ 1942 unsigned status; 1943 int count = 0; 1944 struct cosa_data *cosa = cosa_; 1945again: 1946 status = cosa_getstatus(cosa); 1947#ifdef DEBUG_IRQS 1948 pr_info("cosa%d: got IRQ, status 0x%02x\n", cosa->num, status & 0xff); 1949#endif 1950#ifdef DEBUG_IO 1951 debug_status_in(cosa, status); 1952#endif 1953 switch (status & SR_CMD_FROM_SRP_MASK) { 1954 case SR_DOWN_REQUEST: 1955 tx_interrupt(cosa, status); 1956 break; 1957 case SR_UP_REQUEST: 1958 rx_interrupt(cosa, status); 1959 break; 1960 case SR_END_OF_TRANSFER: 1961 eot_interrupt(cosa, status); 1962 break; 1963 default: 1964 /* We may be too fast for SRP. Try to wait a bit more. */ 1965 if (count++ < 100) { 1966 udelay(100); 1967 goto again; 1968 } 1969 pr_info("cosa%d: unknown status 0x%02x in IRQ after %d retries\n", 1970 cosa->num, status & 0xff, count); 1971 } 1972#ifdef DEBUG_IRQS 1973 if (count) 1974 pr_info("%s: %d-times got unknown status in IRQ\n", 1975 cosa->name, count); 1976 else 1977 pr_info("%s: returning from IRQ\n", cosa->name); 1978#endif 1979 return IRQ_HANDLED; 1980} 1981 1982 1983/* ---------- I/O debugging routines ---------- */ 1984/* 1985 * These routines can be used to monitor COSA/SRP I/O and to printk() 1986 * the data being transferred on the data and status I/O port in a 1987 * readable way. 1988 */ 1989 1990#ifdef DEBUG_IO 1991static void debug_status_in(struct cosa_data *cosa, int status) 1992{ 1993 char *s; 1994 switch (status & SR_CMD_FROM_SRP_MASK) { 1995 case SR_UP_REQUEST: 1996 s = "RX_REQ"; 1997 break; 1998 case SR_DOWN_REQUEST: 1999 s = "TX_REQ"; 2000 break; 2001 case SR_END_OF_TRANSFER: 2002 s = "ET_REQ"; 2003 break; 2004 default: 2005 s = "NO_REQ"; 2006 break; 2007 } 2008 pr_info("%s: IO: status -> 0x%02x (%s%s%s%s)\n", 2009 cosa->name, 2010 status, 2011 status & SR_USR_RQ ? "USR_RQ|" : "", 2012 status & SR_TX_RDY ? "TX_RDY|" : "", 2013 status & SR_RX_RDY ? "RX_RDY|" : "", 2014 s); 2015} 2016 2017static void debug_status_out(struct cosa_data *cosa, int status) 2018{ 2019 pr_info("%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n", 2020 cosa->name, 2021 status, 2022 status & SR_RX_DMA_ENA ? "RXDMA|" : "!rxdma|", 2023 status & SR_TX_DMA_ENA ? "TXDMA|" : "!txdma|", 2024 status & SR_RST ? "RESET|" : "", 2025 status & SR_USR_INT_ENA ? "USRINT|" : "!usrint|", 2026 status & SR_TX_INT_ENA ? "TXINT|" : "!txint|", 2027 status & SR_RX_INT_ENA ? "RXINT" : "!rxint"); 2028} 2029 2030static void debug_data_in(struct cosa_data *cosa, int data) 2031{ 2032 pr_info("%s: IO: data -> 0x%04x\n", cosa->name, data); 2033} 2034 2035static void debug_data_out(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_cmd(struct cosa_data *cosa, int data) 2041{ 2042 pr_info("%s: IO: data <- 0x%04x (%s|%s)\n", 2043 cosa->name, data, 2044 data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy", 2045 data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy"); 2046} 2047#endif 2048 2049/* EOF -- this file has not been truncated */ 2050