cosa.c revision 4951704b4e23d71b99ac933d8e6993bc6225ac13
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 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21/* 22 * The driver for the SRP and COSA synchronous serial cards. 23 * 24 * HARDWARE INFO 25 * 26 * Both cards are developed at the Institute of Computer Science, 27 * Masaryk University (http://www.ics.muni.cz/). The hardware is 28 * developed by Jiri Novotny <novotny@ics.muni.cz>. More information 29 * and the photo of both cards is available at 30 * http://www.pavoucek.cz/cosa.html. The card documentation, firmwares 31 * and other goods can be downloaded from ftp://ftp.ics.muni.cz/pub/cosa/. 32 * For Linux-specific utilities, see below in the "Software info" section. 33 * If you want to order the card, contact Jiri Novotny. 34 * 35 * The SRP (serial port?, the Czech word "srp" means "sickle") card 36 * is a 2-port intelligent (with its own 8-bit CPU) synchronous serial card 37 * with V.24 interfaces up to 80kb/s each. 38 * 39 * The COSA (communication serial adapter?, the Czech word "kosa" means 40 * "scythe") is a next-generation sync/async board with two interfaces 41 * - currently any of V.24, X.21, V.35 and V.36 can be selected. 42 * It has a 16-bit SAB80166 CPU and can do up to 10 Mb/s per channel. 43 * The 8-channels version is in development. 44 * 45 * Both types have downloadable firmware and communicate via ISA DMA. 46 * COSA can be also a bus-mastering device. 47 * 48 * SOFTWARE INFO 49 * 50 * The homepage of the Linux driver is at http://www.fi.muni.cz/~kas/cosa/. 51 * The CVS tree of Linux driver can be viewed there, as well as the 52 * firmware binaries and user-space utilities for downloading the firmware 53 * into the card and setting up the card. 54 * 55 * The Linux driver (unlike the present *BSD drivers :-) can work even 56 * for the COSA and SRP in one computer and allows each channel to work 57 * in one of the three modes (character device, Cisco HDLC, Sync PPP). 58 * 59 * AUTHOR 60 * 61 * The Linux driver was written by Jan "Yenya" Kasprzak <kas@fi.muni.cz>. 62 * 63 * You can mail me bugfixes and even success reports. I am especially 64 * interested in the SMP and/or muliti-channel success/failure reports 65 * (I wonder if I did the locking properly :-). 66 * 67 * THE AUTHOR USED THE FOLLOWING SOURCES WHEN PROGRAMMING THE DRIVER 68 * 69 * The COSA/SRP NetBSD driver by Zdenek Salvet and Ivos Cernohlavek 70 * The skeleton.c by Donald Becker 71 * The SDL Riscom/N2 driver by Mike Natale 72 * The Comtrol Hostess SV11 driver by Alan Cox 73 * The Sync PPP/Cisco HDLC layer (syncppp.c) ported to Linux by Alan Cox 74 */ 75/* 76 * 5/25/1999 : Marcelo Tosatti <marcelo@conectiva.com.br> 77 * fixed a deadlock in cosa_sppp_open 78 */ 79 80/* ---------- Headers, macros, data structures ---------- */ 81 82#include <linux/module.h> 83#include <linux/kernel.h> 84#include <linux/slab.h> 85#include <linux/poll.h> 86#include <linux/fs.h> 87#include <linux/interrupt.h> 88#include <linux/delay.h> 89#include <linux/errno.h> 90#include <linux/ioport.h> 91#include <linux/netdevice.h> 92#include <linux/spinlock.h> 93#include <linux/mutex.h> 94#include <linux/device.h> 95 96#undef COSA_SLOW_IO /* for testing purposes only */ 97 98#include <asm/io.h> 99#include <asm/dma.h> 100#include <asm/byteorder.h> 101 102#include <net/syncppp.h> 103#include "cosa.h" 104 105/* Maximum length of the identification string. */ 106#define COSA_MAX_ID_STRING 128 107 108/* Maximum length of the channel name */ 109#define COSA_MAX_NAME (sizeof("cosaXXXcXXX")+1) 110 111/* Per-channel data structure */ 112 113struct channel_data { 114 void *if_ptr; /* General purpose pointer (used by SPPP) */ 115 int usage; /* Usage count; >0 for chrdev, -1 for netdev */ 116 int num; /* Number of the channel */ 117 struct cosa_data *cosa; /* Pointer to the per-card structure */ 118 int txsize; /* Size of transmitted data */ 119 char *txbuf; /* Transmit buffer */ 120 char name[COSA_MAX_NAME]; /* channel name */ 121 122 /* The HW layer interface */ 123 /* routine called from the RX interrupt */ 124 char *(*setup_rx)(struct channel_data *channel, int size); 125 /* routine called when the RX is done (from the EOT interrupt) */ 126 int (*rx_done)(struct channel_data *channel); 127 /* routine called when the TX is done (from the EOT interrupt) */ 128 int (*tx_done)(struct channel_data *channel, int size); 129 130 /* Character device parts */ 131 struct mutex rlock; 132 struct semaphore wsem; 133 char *rxdata; 134 int rxsize; 135 wait_queue_head_t txwaitq, rxwaitq; 136 int tx_status, rx_status; 137 138 /* SPPP/HDLC device parts */ 139 struct ppp_device pppdev; 140 struct sk_buff *rx_skb, *tx_skb; 141 struct net_device_stats stats; 142}; 143 144/* cosa->firmware_status bits */ 145#define COSA_FW_RESET (1<<0) /* Is the ROM monitor active? */ 146#define COSA_FW_DOWNLOAD (1<<1) /* Is the microcode downloaded? */ 147#define COSA_FW_START (1<<2) /* Is the microcode running? */ 148 149struct cosa_data { 150 int num; /* Card number */ 151 char name[COSA_MAX_NAME]; /* Card name - e.g "cosa0" */ 152 unsigned int datareg, statusreg; /* I/O ports */ 153 unsigned short irq, dma; /* IRQ and DMA number */ 154 unsigned short startaddr; /* Firmware start address */ 155 unsigned short busmaster; /* Use busmastering? */ 156 int nchannels; /* # of channels on this card */ 157 int driver_status; /* For communicating with firmware */ 158 int firmware_status; /* Downloaded, reseted, etc. */ 159 unsigned long rxbitmap, txbitmap;/* Bitmap of channels who are willing to send/receive data */ 160 unsigned long rxtx; /* RX or TX in progress? */ 161 int enabled; 162 int usage; /* usage count */ 163 int txchan, txsize, rxsize; 164 struct channel_data *rxchan; 165 char *bouncebuf; 166 char *txbuf, *rxbuf; 167 struct channel_data *chan; 168 spinlock_t lock; /* For exclusive operations on this structure */ 169 char id_string[COSA_MAX_ID_STRING]; /* ROM monitor ID string */ 170 char *type; /* card type */ 171}; 172 173/* 174 * Define this if you want all the possible ports to be autoprobed. 175 * It is here but it probably is not a good idea to use this. 176 */ 177/* #define COSA_ISA_AUTOPROBE 1 */ 178 179/* 180 * Character device major number. 117 was allocated for us. 181 * The value of 0 means to allocate a first free one. 182 */ 183static int cosa_major = 117; 184 185/* 186 * Encoding of the minor numbers: 187 * The lowest CARD_MINOR_BITS bits means the channel on the single card, 188 * the highest bits means the card number. 189 */ 190#define CARD_MINOR_BITS 4 /* How many bits in minor number are reserved 191 * for the single card */ 192/* 193 * The following depends on CARD_MINOR_BITS. Unfortunately, the "MODULE_STRING" 194 * macro doesn't like anything other than the raw number as an argument :-( 195 */ 196#define MAX_CARDS 16 197/* #define MAX_CARDS (1 << (8-CARD_MINOR_BITS)) */ 198 199#define DRIVER_RX_READY 0x0001 200#define DRIVER_TX_READY 0x0002 201#define DRIVER_TXMAP_SHIFT 2 202#define DRIVER_TXMAP_MASK 0x0c /* FIXME: 0xfc for 8-channel version */ 203 204/* 205 * for cosa->rxtx - indicates whether either transmit or receive is 206 * in progress. These values are mean number of the bit. 207 */ 208#define TXBIT 0 209#define RXBIT 1 210#define IRQBIT 2 211 212#define COSA_MTU 2000 /* FIXME: I don't know this exactly */ 213 214#undef DEBUG_DATA //1 /* Dump the data read or written to the channel */ 215#undef DEBUG_IRQS //1 /* Print the message when the IRQ is received */ 216#undef DEBUG_IO //1 /* Dump the I/O traffic */ 217 218#define TX_TIMEOUT (5*HZ) 219 220/* Maybe the following should be allocated dynamically */ 221static struct cosa_data cosa_cards[MAX_CARDS]; 222static int nr_cards; 223 224#ifdef COSA_ISA_AUTOPROBE 225static int io[MAX_CARDS+1] = { 0x220, 0x228, 0x210, 0x218, 0, }; 226/* NOTE: DMA is not autoprobed!!! */ 227static int dma[MAX_CARDS+1] = { 1, 7, 1, 7, 1, 7, 1, 7, 0, }; 228#else 229static int io[MAX_CARDS+1]; 230static int dma[MAX_CARDS+1]; 231#endif 232/* IRQ can be safely autoprobed */ 233static int irq[MAX_CARDS+1] = { -1, -1, -1, -1, -1, -1, 0, }; 234 235/* for class stuff*/ 236static struct class *cosa_class; 237 238#ifdef MODULE 239module_param_array(io, int, NULL, 0); 240MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards"); 241module_param_array(irq, int, NULL, 0); 242MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards"); 243module_param_array(dma, int, NULL, 0); 244MODULE_PARM_DESC(dma, "The DMA channels of the COSA or SRP cards"); 245 246MODULE_AUTHOR("Jan \"Yenya\" Kasprzak, <kas@fi.muni.cz>"); 247MODULE_DESCRIPTION("Modular driver for the COSA or SRP synchronous card"); 248MODULE_LICENSE("GPL"); 249#endif 250 251/* I use this mainly for testing purposes */ 252#ifdef COSA_SLOW_IO 253#define cosa_outb outb_p 254#define cosa_outw outw_p 255#define cosa_inb inb_p 256#define cosa_inw inw_p 257#else 258#define cosa_outb outb 259#define cosa_outw outw 260#define cosa_inb inb 261#define cosa_inw inw 262#endif 263 264#define is_8bit(cosa) (!(cosa->datareg & 0x08)) 265 266#define cosa_getstatus(cosa) (cosa_inb(cosa->statusreg)) 267#define cosa_putstatus(cosa, stat) (cosa_outb(stat, cosa->statusreg)) 268#define cosa_getdata16(cosa) (cosa_inw(cosa->datareg)) 269#define cosa_getdata8(cosa) (cosa_inb(cosa->datareg)) 270#define cosa_putdata16(cosa, dt) (cosa_outw(dt, cosa->datareg)) 271#define cosa_putdata8(cosa, dt) (cosa_outb(dt, cosa->datareg)) 272 273/* Initialization stuff */ 274static int cosa_probe(int ioaddr, int irq, int dma); 275 276/* HW interface */ 277static void cosa_enable_rx(struct channel_data *chan); 278static void cosa_disable_rx(struct channel_data *chan); 279static int cosa_start_tx(struct channel_data *channel, char *buf, int size); 280static void cosa_kick(struct cosa_data *cosa); 281static int cosa_dma_able(struct channel_data *chan, char *buf, int data); 282 283/* SPPP/HDLC stuff */ 284static void sppp_channel_init(struct channel_data *chan); 285static void sppp_channel_delete(struct channel_data *chan); 286static int cosa_sppp_open(struct net_device *d); 287static int cosa_sppp_close(struct net_device *d); 288static void cosa_sppp_timeout(struct net_device *d); 289static int cosa_sppp_tx(struct sk_buff *skb, struct net_device *d); 290static char *sppp_setup_rx(struct channel_data *channel, int size); 291static int sppp_rx_done(struct channel_data *channel); 292static int sppp_tx_done(struct channel_data *channel, int size); 293static int cosa_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); 294static struct net_device_stats *cosa_net_stats(struct net_device *dev); 295 296/* Character device */ 297static void chardev_channel_init(struct channel_data *chan); 298static char *chrdev_setup_rx(struct channel_data *channel, int size); 299static int chrdev_rx_done(struct channel_data *channel); 300static int chrdev_tx_done(struct channel_data *channel, int size); 301static ssize_t cosa_read(struct file *file, 302 char __user *buf, size_t count, loff_t *ppos); 303static ssize_t cosa_write(struct file *file, 304 const char __user *buf, size_t count, loff_t *ppos); 305static unsigned int cosa_poll(struct file *file, poll_table *poll); 306static int cosa_open(struct inode *inode, struct file *file); 307static int cosa_release(struct inode *inode, struct file *file); 308static int cosa_chardev_ioctl(struct inode *inode, struct file *file, 309 unsigned int cmd, unsigned long arg); 310#ifdef COSA_FASYNC_WORKING 311static int cosa_fasync(struct inode *inode, struct file *file, int on); 312#endif 313 314static const struct file_operations cosa_fops = { 315 .owner = THIS_MODULE, 316 .llseek = no_llseek, 317 .read = cosa_read, 318 .write = cosa_write, 319 .poll = cosa_poll, 320 .ioctl = cosa_chardev_ioctl, 321 .open = cosa_open, 322 .release = cosa_release, 323#ifdef COSA_FASYNC_WORKING 324 .fasync = cosa_fasync, 325#endif 326}; 327 328/* Ioctls */ 329static int cosa_start(struct cosa_data *cosa, int address); 330static int cosa_reset(struct cosa_data *cosa); 331static int cosa_download(struct cosa_data *cosa, void __user *a); 332static int cosa_readmem(struct cosa_data *cosa, void __user *a); 333 334/* COSA/SRP ROM monitor */ 335static int download(struct cosa_data *cosa, const char __user *data, int addr, int len); 336static int startmicrocode(struct cosa_data *cosa, int address); 337static int readmem(struct cosa_data *cosa, char __user *data, int addr, int len); 338static int cosa_reset_and_read_id(struct cosa_data *cosa, char *id); 339 340/* Auxilliary functions */ 341static int get_wait_data(struct cosa_data *cosa); 342static int put_wait_data(struct cosa_data *cosa, int data); 343static int puthexnumber(struct cosa_data *cosa, int number); 344static void put_driver_status(struct cosa_data *cosa); 345static void put_driver_status_nolock(struct cosa_data *cosa); 346 347/* Interrupt handling */ 348static irqreturn_t cosa_interrupt(int irq, void *cosa); 349 350/* I/O ops debugging */ 351#ifdef DEBUG_IO 352static void debug_data_in(struct cosa_data *cosa, int data); 353static void debug_data_out(struct cosa_data *cosa, int data); 354static void debug_data_cmd(struct cosa_data *cosa, int data); 355static void debug_status_in(struct cosa_data *cosa, int status); 356static void debug_status_out(struct cosa_data *cosa, int status); 357#endif 358 359 360/* ---------- Initialization stuff ---------- */ 361 362static int __init cosa_init(void) 363{ 364 int i, err = 0; 365 366 printk(KERN_INFO "cosa v1.08 (c) 1997-2000 Jan Kasprzak <kas@fi.muni.cz>\n"); 367#ifdef CONFIG_SMP 368 printk(KERN_INFO "cosa: SMP found. Please mail any success/failure reports to the author.\n"); 369#endif 370 if (cosa_major > 0) { 371 if (register_chrdev(cosa_major, "cosa", &cosa_fops)) { 372 printk(KERN_WARNING "cosa: unable to get major %d\n", 373 cosa_major); 374 err = -EIO; 375 goto out; 376 } 377 } else { 378 if (!(cosa_major=register_chrdev(0, "cosa", &cosa_fops))) { 379 printk(KERN_WARNING "cosa: unable to register chardev\n"); 380 err = -EIO; 381 goto out; 382 } 383 } 384 for (i=0; i<MAX_CARDS; i++) 385 cosa_cards[i].num = -1; 386 for (i=0; io[i] != 0 && i < MAX_CARDS; i++) 387 cosa_probe(io[i], irq[i], dma[i]); 388 if (!nr_cards) { 389 printk(KERN_WARNING "cosa: no devices found.\n"); 390 unregister_chrdev(cosa_major, "cosa"); 391 err = -ENODEV; 392 goto out; 393 } 394 cosa_class = class_create(THIS_MODULE, "cosa"); 395 if (IS_ERR(cosa_class)) { 396 err = PTR_ERR(cosa_class); 397 goto out_chrdev; 398 } 399 for (i=0; i<nr_cards; i++) { 400 device_create(cosa_class, NULL, MKDEV(cosa_major, i), "cosa%d", i); 401 } 402 err = 0; 403 goto out; 404 405out_chrdev: 406 unregister_chrdev(cosa_major, "cosa"); 407out: 408 return err; 409} 410module_init(cosa_init); 411 412static void __exit cosa_exit(void) 413{ 414 struct cosa_data *cosa; 415 int i; 416 printk(KERN_INFO "Unloading the cosa module\n"); 417 418 for (i=0; i<nr_cards; i++) 419 device_destroy(cosa_class, MKDEV(cosa_major, i)); 420 class_destroy(cosa_class); 421 for (cosa=cosa_cards; nr_cards--; cosa++) { 422 /* Clean up the per-channel data */ 423 for (i=0; i<cosa->nchannels; i++) { 424 /* Chardev driver has no alloc'd per-channel data */ 425 sppp_channel_delete(cosa->chan+i); 426 } 427 /* Clean up the per-card data */ 428 kfree(cosa->chan); 429 kfree(cosa->bouncebuf); 430 free_irq(cosa->irq, cosa); 431 free_dma(cosa->dma); 432 release_region(cosa->datareg,is_8bit(cosa)?2:4); 433 } 434 unregister_chrdev(cosa_major, "cosa"); 435} 436module_exit(cosa_exit); 437 438/* 439 * This function should register all the net devices needed for the 440 * single channel. 441 */ 442static __inline__ void channel_init(struct channel_data *chan) 443{ 444 sprintf(chan->name, "cosa%dc%d", chan->cosa->num, chan->num); 445 446 /* Initialize the chardev data structures */ 447 chardev_channel_init(chan); 448 449 /* Register the sppp interface */ 450 sppp_channel_init(chan); 451} 452 453static int cosa_probe(int base, int irq, int dma) 454{ 455 struct cosa_data *cosa = cosa_cards+nr_cards; 456 int i, err = 0; 457 458 memset(cosa, 0, sizeof(struct cosa_data)); 459 460 /* Checking validity of parameters: */ 461 /* IRQ should be 2-7 or 10-15; negative IRQ means autoprobe */ 462 if ((irq >= 0 && irq < 2) || irq > 15 || (irq < 10 && irq > 7)) { 463 printk (KERN_INFO "cosa_probe: invalid IRQ %d\n", irq); 464 return -1; 465 } 466 /* I/O address should be between 0x100 and 0x3ff and should be 467 * multiple of 8. */ 468 if (base < 0x100 || base > 0x3ff || base & 0x7) { 469 printk (KERN_INFO "cosa_probe: invalid I/O address 0x%x\n", 470 base); 471 return -1; 472 } 473 /* DMA should be 0,1 or 3-7 */ 474 if (dma < 0 || dma == 4 || dma > 7) { 475 printk (KERN_INFO "cosa_probe: invalid DMA %d\n", dma); 476 return -1; 477 } 478 /* and finally, on 16-bit COSA DMA should be 4-7 and 479 * I/O base should not be multiple of 0x10 */ 480 if (((base & 0x8) && dma < 4) || (!(base & 0x8) && dma > 3)) { 481 printk (KERN_INFO "cosa_probe: 8/16 bit base and DMA mismatch" 482 " (base=0x%x, dma=%d)\n", base, dma); 483 return -1; 484 } 485 486 cosa->dma = dma; 487 cosa->datareg = base; 488 cosa->statusreg = is_8bit(cosa)?base+1:base+2; 489 spin_lock_init(&cosa->lock); 490 491 if (!request_region(base, is_8bit(cosa)?2:4,"cosa")) 492 return -1; 493 494 if (cosa_reset_and_read_id(cosa, cosa->id_string) < 0) { 495 printk(KERN_DEBUG "cosa: probe at 0x%x failed.\n", base); 496 err = -1; 497 goto err_out; 498 } 499 500 /* Test the validity of identification string */ 501 if (!strncmp(cosa->id_string, "SRP", 3)) 502 cosa->type = "srp"; 503 else if (!strncmp(cosa->id_string, "COSA", 4)) 504 cosa->type = is_8bit(cosa)? "cosa8": "cosa16"; 505 else { 506/* Print a warning only if we are not autoprobing */ 507#ifndef COSA_ISA_AUTOPROBE 508 printk(KERN_INFO "cosa: valid signature not found at 0x%x.\n", 509 base); 510#endif 511 err = -1; 512 goto err_out; 513 } 514 /* Update the name of the region now we know the type of card */ 515 release_region(base, is_8bit(cosa)?2:4); 516 if (!request_region(base, is_8bit(cosa)?2:4, cosa->type)) { 517 printk(KERN_DEBUG "cosa: changing name at 0x%x failed.\n", base); 518 return -1; 519 } 520 521 /* Now do IRQ autoprobe */ 522 if (irq < 0) { 523 unsigned long irqs; 524/* printk(KERN_INFO "IRQ autoprobe\n"); */ 525 irqs = probe_irq_on(); 526 /* 527 * Enable interrupt on tx buffer empty (it sure is) 528 * really sure ? 529 * FIXME: When this code is not used as module, we should 530 * probably call udelay() instead of the interruptible sleep. 531 */ 532 set_current_state(TASK_INTERRUPTIBLE); 533 cosa_putstatus(cosa, SR_TX_INT_ENA); 534 schedule_timeout(30); 535 irq = probe_irq_off(irqs); 536 /* Disable all IRQs from the card */ 537 cosa_putstatus(cosa, 0); 538 /* Empty the received data register */ 539 cosa_getdata8(cosa); 540 541 if (irq < 0) { 542 printk (KERN_INFO "cosa IRQ autoprobe: multiple interrupts obtained (%d, board at 0x%x)\n", 543 irq, cosa->datareg); 544 err = -1; 545 goto err_out; 546 } 547 if (irq == 0) { 548 printk (KERN_INFO "cosa IRQ autoprobe: no interrupt obtained (board at 0x%x)\n", 549 cosa->datareg); 550 /* return -1; */ 551 } 552 } 553 554 cosa->irq = irq; 555 cosa->num = nr_cards; 556 cosa->usage = 0; 557 cosa->nchannels = 2; /* FIXME: how to determine this? */ 558 559 if (request_irq(cosa->irq, cosa_interrupt, 0, cosa->type, cosa)) { 560 err = -1; 561 goto err_out; 562 } 563 if (request_dma(cosa->dma, cosa->type)) { 564 err = -1; 565 goto err_out1; 566 } 567 568 cosa->bouncebuf = kmalloc(COSA_MTU, GFP_KERNEL|GFP_DMA); 569 if (!cosa->bouncebuf) { 570 err = -ENOMEM; 571 goto err_out2; 572 } 573 sprintf(cosa->name, "cosa%d", cosa->num); 574 575 /* Initialize the per-channel data */ 576 cosa->chan = kcalloc(cosa->nchannels, sizeof(struct channel_data), GFP_KERNEL); 577 if (!cosa->chan) { 578 err = -ENOMEM; 579 goto err_out3; 580 } 581 for (i=0; i<cosa->nchannels; i++) { 582 cosa->chan[i].cosa = cosa; 583 cosa->chan[i].num = i; 584 channel_init(cosa->chan+i); 585 } 586 587 printk (KERN_INFO "cosa%d: %s (%s at 0x%x irq %d dma %d), %d channels\n", 588 cosa->num, cosa->id_string, cosa->type, 589 cosa->datareg, cosa->irq, cosa->dma, cosa->nchannels); 590 591 return nr_cards++; 592err_out3: 593 kfree(cosa->bouncebuf); 594err_out2: 595 free_dma(cosa->dma); 596err_out1: 597 free_irq(cosa->irq, cosa); 598err_out: 599 release_region(cosa->datareg,is_8bit(cosa)?2:4); 600 printk(KERN_NOTICE "cosa%d: allocating resources failed\n", 601 cosa->num); 602 return err; 603} 604 605 606/*---------- SPPP/HDLC netdevice ---------- */ 607 608static void cosa_setup(struct net_device *d) 609{ 610 d->open = cosa_sppp_open; 611 d->stop = cosa_sppp_close; 612 d->hard_start_xmit = cosa_sppp_tx; 613 d->do_ioctl = cosa_sppp_ioctl; 614 d->get_stats = cosa_net_stats; 615 d->tx_timeout = cosa_sppp_timeout; 616 d->watchdog_timeo = TX_TIMEOUT; 617} 618 619static void sppp_channel_init(struct channel_data *chan) 620{ 621 struct net_device *d; 622 chan->if_ptr = &chan->pppdev; 623 d = alloc_netdev(0, chan->name, cosa_setup); 624 if (!d) { 625 printk(KERN_WARNING "%s: alloc_netdev failed.\n", chan->name); 626 return; 627 } 628 chan->pppdev.dev = d; 629 d->base_addr = chan->cosa->datareg; 630 d->irq = chan->cosa->irq; 631 d->dma = chan->cosa->dma; 632 d->ml_priv = chan; 633 sppp_attach(&chan->pppdev); 634 if (register_netdev(d)) { 635 printk(KERN_WARNING "%s: register_netdev failed.\n", d->name); 636 sppp_detach(d); 637 free_netdev(d); 638 chan->pppdev.dev = NULL; 639 return; 640 } 641} 642 643static void sppp_channel_delete(struct channel_data *chan) 644{ 645 unregister_netdev(chan->pppdev.dev); 646 sppp_detach(chan->pppdev.dev); 647 free_netdev(chan->pppdev.dev); 648 chan->pppdev.dev = NULL; 649} 650 651static int cosa_sppp_open(struct net_device *d) 652{ 653 struct channel_data *chan = d->ml_priv; 654 int err; 655 unsigned long flags; 656 657 if (!(chan->cosa->firmware_status & COSA_FW_START)) { 658 printk(KERN_NOTICE "%s: start the firmware first (status %d)\n", 659 chan->cosa->name, chan->cosa->firmware_status); 660 return -EPERM; 661 } 662 spin_lock_irqsave(&chan->cosa->lock, flags); 663 if (chan->usage != 0) { 664 printk(KERN_WARNING "%s: sppp_open called with usage count %d\n", 665 chan->name, chan->usage); 666 spin_unlock_irqrestore(&chan->cosa->lock, flags); 667 return -EBUSY; 668 } 669 chan->setup_rx = sppp_setup_rx; 670 chan->tx_done = sppp_tx_done; 671 chan->rx_done = sppp_rx_done; 672 chan->usage=-1; 673 chan->cosa->usage++; 674 spin_unlock_irqrestore(&chan->cosa->lock, flags); 675 676 err = sppp_open(d); 677 if (err) { 678 spin_lock_irqsave(&chan->cosa->lock, flags); 679 chan->usage=0; 680 chan->cosa->usage--; 681 682 spin_unlock_irqrestore(&chan->cosa->lock, flags); 683 return err; 684 } 685 686 netif_start_queue(d); 687 cosa_enable_rx(chan); 688 return 0; 689} 690 691static int cosa_sppp_tx(struct sk_buff *skb, struct net_device *dev) 692{ 693 struct channel_data *chan = dev->ml_priv; 694 695 netif_stop_queue(dev); 696 697 chan->tx_skb = skb; 698 cosa_start_tx(chan, skb->data, skb->len); 699 return 0; 700} 701 702static void cosa_sppp_timeout(struct net_device *dev) 703{ 704 struct channel_data *chan = dev->ml_priv; 705 706 if (test_bit(RXBIT, &chan->cosa->rxtx)) { 707 chan->stats.rx_errors++; 708 chan->stats.rx_missed_errors++; 709 } else { 710 chan->stats.tx_errors++; 711 chan->stats.tx_aborted_errors++; 712 } 713 cosa_kick(chan->cosa); 714 if (chan->tx_skb) { 715 dev_kfree_skb(chan->tx_skb); 716 chan->tx_skb = NULL; 717 } 718 netif_wake_queue(dev); 719} 720 721static int cosa_sppp_close(struct net_device *d) 722{ 723 struct channel_data *chan = d->ml_priv; 724 unsigned long flags; 725 726 netif_stop_queue(d); 727 sppp_close(d); 728 cosa_disable_rx(chan); 729 spin_lock_irqsave(&chan->cosa->lock, flags); 730 if (chan->rx_skb) { 731 kfree_skb(chan->rx_skb); 732 chan->rx_skb = NULL; 733 } 734 if (chan->tx_skb) { 735 kfree_skb(chan->tx_skb); 736 chan->tx_skb = NULL; 737 } 738 chan->usage=0; 739 chan->cosa->usage--; 740 spin_unlock_irqrestore(&chan->cosa->lock, flags); 741 return 0; 742} 743 744static char *sppp_setup_rx(struct channel_data *chan, int size) 745{ 746 /* 747 * We can safely fall back to non-dma-able memory, because we have 748 * the cosa->bouncebuf pre-allocated. 749 */ 750 if (chan->rx_skb) 751 kfree_skb(chan->rx_skb); 752 chan->rx_skb = dev_alloc_skb(size); 753 if (chan->rx_skb == NULL) { 754 printk(KERN_NOTICE "%s: Memory squeeze, dropping packet\n", 755 chan->name); 756 chan->stats.rx_dropped++; 757 return NULL; 758 } 759 chan->pppdev.dev->trans_start = jiffies; 760 return skb_put(chan->rx_skb, size); 761} 762 763static int sppp_rx_done(struct channel_data *chan) 764{ 765 if (!chan->rx_skb) { 766 printk(KERN_WARNING "%s: rx_done with empty skb!\n", 767 chan->name); 768 chan->stats.rx_errors++; 769 chan->stats.rx_frame_errors++; 770 return 0; 771 } 772 chan->rx_skb->protocol = htons(ETH_P_WAN_PPP); 773 chan->rx_skb->dev = chan->pppdev.dev; 774 skb_reset_mac_header(chan->rx_skb); 775 chan->stats.rx_packets++; 776 chan->stats.rx_bytes += chan->cosa->rxsize; 777 netif_rx(chan->rx_skb); 778 chan->rx_skb = NULL; 779 chan->pppdev.dev->last_rx = jiffies; 780 return 0; 781} 782 783/* ARGSUSED */ 784static int sppp_tx_done(struct channel_data *chan, int size) 785{ 786 if (!chan->tx_skb) { 787 printk(KERN_WARNING "%s: tx_done with empty skb!\n", 788 chan->name); 789 chan->stats.tx_errors++; 790 chan->stats.tx_aborted_errors++; 791 return 1; 792 } 793 dev_kfree_skb_irq(chan->tx_skb); 794 chan->tx_skb = NULL; 795 chan->stats.tx_packets++; 796 chan->stats.tx_bytes += size; 797 netif_wake_queue(chan->pppdev.dev); 798 return 1; 799} 800 801static struct net_device_stats *cosa_net_stats(struct net_device *dev) 802{ 803 struct channel_data *chan = dev->ml_priv; 804 return &chan->stats; 805} 806 807 808/*---------- Character device ---------- */ 809 810static void chardev_channel_init(struct channel_data *chan) 811{ 812 mutex_init(&chan->rlock); 813 init_MUTEX(&chan->wsem); 814} 815 816static ssize_t cosa_read(struct file *file, 817 char __user *buf, size_t count, loff_t *ppos) 818{ 819 DECLARE_WAITQUEUE(wait, current); 820 unsigned long flags; 821 struct channel_data *chan = file->private_data; 822 struct cosa_data *cosa = chan->cosa; 823 char *kbuf; 824 825 if (!(cosa->firmware_status & COSA_FW_START)) { 826 printk(KERN_NOTICE "%s: start the firmware first (status %d)\n", 827 cosa->name, cosa->firmware_status); 828 return -EPERM; 829 } 830 if (mutex_lock_interruptible(&chan->rlock)) 831 return -ERESTARTSYS; 832 833 if ((chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL)) == NULL) { 834 printk(KERN_INFO "%s: cosa_read() - OOM\n", cosa->name); 835 mutex_unlock(&chan->rlock); 836 return -ENOMEM; 837 } 838 839 chan->rx_status = 0; 840 cosa_enable_rx(chan); 841 spin_lock_irqsave(&cosa->lock, flags); 842 add_wait_queue(&chan->rxwaitq, &wait); 843 while(!chan->rx_status) { 844 current->state = TASK_INTERRUPTIBLE; 845 spin_unlock_irqrestore(&cosa->lock, flags); 846 schedule(); 847 spin_lock_irqsave(&cosa->lock, flags); 848 if (signal_pending(current) && chan->rx_status == 0) { 849 chan->rx_status = 1; 850 remove_wait_queue(&chan->rxwaitq, &wait); 851 current->state = TASK_RUNNING; 852 spin_unlock_irqrestore(&cosa->lock, flags); 853 mutex_unlock(&chan->rlock); 854 return -ERESTARTSYS; 855 } 856 } 857 remove_wait_queue(&chan->rxwaitq, &wait); 858 current->state = TASK_RUNNING; 859 kbuf = chan->rxdata; 860 count = chan->rxsize; 861 spin_unlock_irqrestore(&cosa->lock, flags); 862 mutex_unlock(&chan->rlock); 863 864 if (copy_to_user(buf, kbuf, count)) { 865 kfree(kbuf); 866 return -EFAULT; 867 } 868 kfree(kbuf); 869 return count; 870} 871 872static char *chrdev_setup_rx(struct channel_data *chan, int size) 873{ 874 /* Expect size <= COSA_MTU */ 875 chan->rxsize = size; 876 return chan->rxdata; 877} 878 879static int chrdev_rx_done(struct channel_data *chan) 880{ 881 if (chan->rx_status) { /* Reader has died */ 882 kfree(chan->rxdata); 883 up(&chan->wsem); 884 } 885 chan->rx_status = 1; 886 wake_up_interruptible(&chan->rxwaitq); 887 return 1; 888} 889 890 891static ssize_t cosa_write(struct file *file, 892 const char __user *buf, size_t count, loff_t *ppos) 893{ 894 DECLARE_WAITQUEUE(wait, current); 895 struct channel_data *chan = file->private_data; 896 struct cosa_data *cosa = chan->cosa; 897 unsigned long flags; 898 char *kbuf; 899 900 if (!(cosa->firmware_status & COSA_FW_START)) { 901 printk(KERN_NOTICE "%s: start the firmware first (status %d)\n", 902 cosa->name, cosa->firmware_status); 903 return -EPERM; 904 } 905 if (down_interruptible(&chan->wsem)) 906 return -ERESTARTSYS; 907 908 if (count > COSA_MTU) 909 count = COSA_MTU; 910 911 /* Allocate the buffer */ 912 if ((kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA)) == NULL) { 913 printk(KERN_NOTICE "%s: cosa_write() OOM - dropping packet\n", 914 cosa->name); 915 up(&chan->wsem); 916 return -ENOMEM; 917 } 918 if (copy_from_user(kbuf, buf, count)) { 919 up(&chan->wsem); 920 kfree(kbuf); 921 return -EFAULT; 922 } 923 chan->tx_status=0; 924 cosa_start_tx(chan, kbuf, count); 925 926 spin_lock_irqsave(&cosa->lock, flags); 927 add_wait_queue(&chan->txwaitq, &wait); 928 while(!chan->tx_status) { 929 current->state = TASK_INTERRUPTIBLE; 930 spin_unlock_irqrestore(&cosa->lock, flags); 931 schedule(); 932 spin_lock_irqsave(&cosa->lock, flags); 933 if (signal_pending(current) && chan->tx_status == 0) { 934 chan->tx_status = 1; 935 remove_wait_queue(&chan->txwaitq, &wait); 936 current->state = TASK_RUNNING; 937 chan->tx_status = 1; 938 spin_unlock_irqrestore(&cosa->lock, flags); 939 return -ERESTARTSYS; 940 } 941 } 942 remove_wait_queue(&chan->txwaitq, &wait); 943 current->state = TASK_RUNNING; 944 up(&chan->wsem); 945 spin_unlock_irqrestore(&cosa->lock, flags); 946 kfree(kbuf); 947 return count; 948} 949 950static int chrdev_tx_done(struct channel_data *chan, int size) 951{ 952 if (chan->tx_status) { /* Writer was interrupted */ 953 kfree(chan->txbuf); 954 up(&chan->wsem); 955 } 956 chan->tx_status = 1; 957 wake_up_interruptible(&chan->txwaitq); 958 return 1; 959} 960 961static unsigned int cosa_poll(struct file *file, poll_table *poll) 962{ 963 printk(KERN_INFO "cosa_poll is here\n"); 964 return 0; 965} 966 967static int cosa_open(struct inode *inode, struct file *file) 968{ 969 struct cosa_data *cosa; 970 struct channel_data *chan; 971 unsigned long flags; 972 int n; 973 974 if ((n=iminor(file->f_path.dentry->d_inode)>>CARD_MINOR_BITS) 975 >= nr_cards) 976 return -ENODEV; 977 cosa = cosa_cards+n; 978 979 if ((n=iminor(file->f_path.dentry->d_inode) 980 & ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) 981 return -ENODEV; 982 chan = cosa->chan + n; 983 984 file->private_data = chan; 985 986 spin_lock_irqsave(&cosa->lock, flags); 987 988 if (chan->usage < 0) { /* in netdev mode */ 989 spin_unlock_irqrestore(&cosa->lock, flags); 990 return -EBUSY; 991 } 992 cosa->usage++; 993 chan->usage++; 994 995 chan->tx_done = chrdev_tx_done; 996 chan->setup_rx = chrdev_setup_rx; 997 chan->rx_done = chrdev_rx_done; 998 spin_unlock_irqrestore(&cosa->lock, flags); 999 return 0; 1000} 1001 1002static int cosa_release(struct inode *inode, struct file *file) 1003{ 1004 struct channel_data *channel = file->private_data; 1005 struct cosa_data *cosa; 1006 unsigned long flags; 1007 1008 cosa = channel->cosa; 1009 spin_lock_irqsave(&cosa->lock, flags); 1010 cosa->usage--; 1011 channel->usage--; 1012 spin_unlock_irqrestore(&cosa->lock, flags); 1013 return 0; 1014} 1015 1016#ifdef COSA_FASYNC_WORKING 1017static struct fasync_struct *fasync[256] = { NULL, }; 1018 1019/* To be done ... */ 1020static int cosa_fasync(struct inode *inode, struct file *file, int on) 1021{ 1022 int port = iminor(inode); 1023 int rv = fasync_helper(inode, file, on, &fasync[port]); 1024 return rv < 0 ? rv : 0; 1025} 1026#endif 1027 1028 1029/* ---------- Ioctls ---------- */ 1030 1031/* 1032 * Ioctl subroutines can safely be made inline, because they are called 1033 * only from cosa_ioctl(). 1034 */ 1035static inline int cosa_reset(struct cosa_data *cosa) 1036{ 1037 char idstring[COSA_MAX_ID_STRING]; 1038 if (cosa->usage > 1) 1039 printk(KERN_INFO "cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1040 cosa->num, cosa->usage); 1041 cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START); 1042 if (cosa_reset_and_read_id(cosa, idstring) < 0) { 1043 printk(KERN_NOTICE "cosa%d: reset failed\n", cosa->num); 1044 return -EIO; 1045 } 1046 printk(KERN_INFO "cosa%d: resetting device: %s\n", cosa->num, 1047 idstring); 1048 cosa->firmware_status |= COSA_FW_RESET; 1049 return 0; 1050} 1051 1052/* High-level function to download data into COSA memory. Calls download() */ 1053static inline int cosa_download(struct cosa_data *cosa, void __user *arg) 1054{ 1055 struct cosa_download d; 1056 int i; 1057 1058 if (cosa->usage > 1) 1059 printk(KERN_INFO "%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1060 cosa->name, cosa->usage); 1061 if (!(cosa->firmware_status & COSA_FW_RESET)) { 1062 printk(KERN_NOTICE "%s: reset the card first (status %d).\n", 1063 cosa->name, cosa->firmware_status); 1064 return -EPERM; 1065 } 1066 1067 if (copy_from_user(&d, arg, sizeof(d))) 1068 return -EFAULT; 1069 1070 if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE) 1071 return -EINVAL; 1072 if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE) 1073 return -EINVAL; 1074 1075 1076 /* If something fails, force the user to reset the card */ 1077 cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD); 1078 1079 i = download(cosa, d.code, d.len, d.addr); 1080 if (i < 0) { 1081 printk(KERN_NOTICE "cosa%d: microcode download failed: %d\n", 1082 cosa->num, i); 1083 return -EIO; 1084 } 1085 printk(KERN_INFO "cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n", 1086 cosa->num, d.len, d.addr); 1087 cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD; 1088 return 0; 1089} 1090 1091/* High-level function to read COSA memory. Calls readmem() */ 1092static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg) 1093{ 1094 struct cosa_download d; 1095 int i; 1096 1097 if (cosa->usage > 1) 1098 printk(KERN_INFO "cosa%d: WARNING: readmem requested with " 1099 "cosa->usage > 1 (%d). Odd things may happen.\n", 1100 cosa->num, cosa->usage); 1101 if (!(cosa->firmware_status & COSA_FW_RESET)) { 1102 printk(KERN_NOTICE "%s: reset the card first (status %d).\n", 1103 cosa->name, cosa->firmware_status); 1104 return -EPERM; 1105 } 1106 1107 if (copy_from_user(&d, arg, sizeof(d))) 1108 return -EFAULT; 1109 1110 /* If something fails, force the user to reset the card */ 1111 cosa->firmware_status &= ~COSA_FW_RESET; 1112 1113 i = readmem(cosa, d.code, d.len, d.addr); 1114 if (i < 0) { 1115 printk(KERN_NOTICE "cosa%d: reading memory failed: %d\n", 1116 cosa->num, i); 1117 return -EIO; 1118 } 1119 printk(KERN_INFO "cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n", 1120 cosa->num, d.len, d.addr); 1121 cosa->firmware_status |= COSA_FW_RESET; 1122 return 0; 1123} 1124 1125/* High-level function to start microcode. Calls startmicrocode(). */ 1126static inline int cosa_start(struct cosa_data *cosa, int address) 1127{ 1128 int i; 1129 1130 if (cosa->usage > 1) 1131 printk(KERN_INFO "cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n", 1132 cosa->num, cosa->usage); 1133 1134 if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD)) 1135 != (COSA_FW_RESET|COSA_FW_DOWNLOAD)) { 1136 printk(KERN_NOTICE "%s: download the microcode and/or reset the card first (status %d).\n", 1137 cosa->name, cosa->firmware_status); 1138 return -EPERM; 1139 } 1140 cosa->firmware_status &= ~COSA_FW_RESET; 1141 if ((i=startmicrocode(cosa, address)) < 0) { 1142 printk(KERN_NOTICE "cosa%d: start microcode at 0x%04x failed: %d\n", 1143 cosa->num, address, i); 1144 return -EIO; 1145 } 1146 printk(KERN_INFO "cosa%d: starting microcode at 0x%04x\n", 1147 cosa->num, address); 1148 cosa->startaddr = address; 1149 cosa->firmware_status |= COSA_FW_START; 1150 return 0; 1151} 1152 1153/* Buffer of size at least COSA_MAX_ID_STRING is expected */ 1154static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string) 1155{ 1156 int l = strlen(cosa->id_string)+1; 1157 if (copy_to_user(string, cosa->id_string, l)) 1158 return -EFAULT; 1159 return l; 1160} 1161 1162/* Buffer of size at least COSA_MAX_ID_STRING is expected */ 1163static inline int cosa_gettype(struct cosa_data *cosa, char __user *string) 1164{ 1165 int l = strlen(cosa->type)+1; 1166 if (copy_to_user(string, cosa->type, l)) 1167 return -EFAULT; 1168 return l; 1169} 1170 1171static int cosa_ioctl_common(struct cosa_data *cosa, 1172 struct channel_data *channel, unsigned int cmd, unsigned long arg) 1173{ 1174 void __user *argp = (void __user *)arg; 1175 switch(cmd) { 1176 case COSAIORSET: /* Reset the device */ 1177 if (!capable(CAP_NET_ADMIN)) 1178 return -EACCES; 1179 return cosa_reset(cosa); 1180 case COSAIOSTRT: /* Start the firmware */ 1181 if (!capable(CAP_SYS_RAWIO)) 1182 return -EACCES; 1183 return cosa_start(cosa, arg); 1184 case COSAIODOWNLD: /* Download the firmware */ 1185 if (!capable(CAP_SYS_RAWIO)) 1186 return -EACCES; 1187 1188 return cosa_download(cosa, argp); 1189 case COSAIORMEM: 1190 if (!capable(CAP_SYS_RAWIO)) 1191 return -EACCES; 1192 return cosa_readmem(cosa, argp); 1193 case COSAIORTYPE: 1194 return cosa_gettype(cosa, argp); 1195 case COSAIORIDSTR: 1196 return cosa_getidstr(cosa, argp); 1197 case COSAIONRCARDS: 1198 return nr_cards; 1199 case COSAIONRCHANS: 1200 return cosa->nchannels; 1201 case COSAIOBMSET: 1202 if (!capable(CAP_SYS_RAWIO)) 1203 return -EACCES; 1204 if (is_8bit(cosa)) 1205 return -EINVAL; 1206 if (arg != COSA_BM_OFF && arg != COSA_BM_ON) 1207 return -EINVAL; 1208 cosa->busmaster = arg; 1209 return 0; 1210 case COSAIOBMGET: 1211 return cosa->busmaster; 1212 } 1213 return -ENOIOCTLCMD; 1214} 1215 1216static int cosa_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, 1217 int cmd) 1218{ 1219 int rv; 1220 struct channel_data *chan = dev->ml_priv; 1221 rv = cosa_ioctl_common(chan->cosa, chan, cmd, (unsigned long)ifr->ifr_data); 1222 if (rv == -ENOIOCTLCMD) { 1223 return sppp_do_ioctl(dev, ifr, cmd); 1224 } 1225 return rv; 1226} 1227 1228static int cosa_chardev_ioctl(struct inode *inode, struct file *file, 1229 unsigned int cmd, unsigned long arg) 1230{ 1231 struct channel_data *channel = file->private_data; 1232 struct cosa_data *cosa = channel->cosa; 1233 return cosa_ioctl_common(cosa, channel, cmd, arg); 1234} 1235 1236 1237/*---------- HW layer interface ---------- */ 1238 1239/* 1240 * The higher layer can bind itself to the HW layer by setting the callbacks 1241 * in the channel_data structure and by using these routines. 1242 */ 1243static void cosa_enable_rx(struct channel_data *chan) 1244{ 1245 struct cosa_data *cosa = chan->cosa; 1246 1247 if (!test_and_set_bit(chan->num, &cosa->rxbitmap)) 1248 put_driver_status(cosa); 1249} 1250 1251static void cosa_disable_rx(struct channel_data *chan) 1252{ 1253 struct cosa_data *cosa = chan->cosa; 1254 1255 if (test_and_clear_bit(chan->num, &cosa->rxbitmap)) 1256 put_driver_status(cosa); 1257} 1258 1259/* 1260 * FIXME: This routine probably should check for cosa_start_tx() called when 1261 * the previous transmit is still unfinished. In this case the non-zero 1262 * return value should indicate to the caller that the queuing(sp?) up 1263 * the transmit has failed. 1264 */ 1265static int cosa_start_tx(struct channel_data *chan, char *buf, int len) 1266{ 1267 struct cosa_data *cosa = chan->cosa; 1268 unsigned long flags; 1269#ifdef DEBUG_DATA 1270 int i; 1271 1272 printk(KERN_INFO "cosa%dc%d: starting tx(0x%x)", chan->cosa->num, 1273 chan->num, len); 1274 for (i=0; i<len; i++) 1275 printk(" %02x", buf[i]&0xff); 1276 printk("\n"); 1277#endif 1278 spin_lock_irqsave(&cosa->lock, flags); 1279 chan->txbuf = buf; 1280 chan->txsize = len; 1281 if (len > COSA_MTU) 1282 chan->txsize = COSA_MTU; 1283 spin_unlock_irqrestore(&cosa->lock, flags); 1284 1285 /* Tell the firmware we are ready */ 1286 set_bit(chan->num, &cosa->txbitmap); 1287 put_driver_status(cosa); 1288 1289 return 0; 1290} 1291 1292static void put_driver_status(struct cosa_data *cosa) 1293{ 1294 unsigned long flags; 1295 int status; 1296 1297 spin_lock_irqsave(&cosa->lock, flags); 1298 1299 status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) 1300 | (cosa->txbitmap ? DRIVER_TX_READY : 0) 1301 | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) 1302 &DRIVER_TXMAP_MASK : 0); 1303 if (!cosa->rxtx) { 1304 if (cosa->rxbitmap|cosa->txbitmap) { 1305 if (!cosa->enabled) { 1306 cosa_putstatus(cosa, SR_RX_INT_ENA); 1307#ifdef DEBUG_IO 1308 debug_status_out(cosa, SR_RX_INT_ENA); 1309#endif 1310 cosa->enabled = 1; 1311 } 1312 } else if (cosa->enabled) { 1313 cosa->enabled = 0; 1314 cosa_putstatus(cosa, 0); 1315#ifdef DEBUG_IO 1316 debug_status_out(cosa, 0); 1317#endif 1318 } 1319 cosa_putdata8(cosa, status); 1320#ifdef DEBUG_IO 1321 debug_data_cmd(cosa, status); 1322#endif 1323 } 1324 spin_unlock_irqrestore(&cosa->lock, flags); 1325} 1326 1327static void put_driver_status_nolock(struct cosa_data *cosa) 1328{ 1329 int status; 1330 1331 status = (cosa->rxbitmap ? DRIVER_RX_READY : 0) 1332 | (cosa->txbitmap ? DRIVER_TX_READY : 0) 1333 | (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT) 1334 &DRIVER_TXMAP_MASK : 0); 1335 1336 if (cosa->rxbitmap|cosa->txbitmap) { 1337 cosa_putstatus(cosa, SR_RX_INT_ENA); 1338#ifdef DEBUG_IO 1339 debug_status_out(cosa, SR_RX_INT_ENA); 1340#endif 1341 cosa->enabled = 1; 1342 } else { 1343 cosa_putstatus(cosa, 0); 1344#ifdef DEBUG_IO 1345 debug_status_out(cosa, 0); 1346#endif 1347 cosa->enabled = 0; 1348 } 1349 cosa_putdata8(cosa, status); 1350#ifdef DEBUG_IO 1351 debug_data_cmd(cosa, status); 1352#endif 1353} 1354 1355/* 1356 * The "kickme" function: When the DMA times out, this is called to 1357 * clean up the driver status. 1358 * FIXME: Preliminary support, the interface is probably wrong. 1359 */ 1360static void cosa_kick(struct cosa_data *cosa) 1361{ 1362 unsigned long flags, flags1; 1363 char *s = "(probably) IRQ"; 1364 1365 if (test_bit(RXBIT, &cosa->rxtx)) 1366 s = "RX DMA"; 1367 if (test_bit(TXBIT, &cosa->rxtx)) 1368 s = "TX DMA"; 1369 1370 printk(KERN_INFO "%s: %s timeout - restarting.\n", cosa->name, s); 1371 spin_lock_irqsave(&cosa->lock, flags); 1372 cosa->rxtx = 0; 1373 1374 flags1 = claim_dma_lock(); 1375 disable_dma(cosa->dma); 1376 clear_dma_ff(cosa->dma); 1377 release_dma_lock(flags1); 1378 1379 /* FIXME: Anything else? */ 1380 udelay(100); 1381 cosa_putstatus(cosa, 0); 1382 udelay(100); 1383 (void) cosa_getdata8(cosa); 1384 udelay(100); 1385 cosa_putdata8(cosa, 0); 1386 udelay(100); 1387 put_driver_status_nolock(cosa); 1388 spin_unlock_irqrestore(&cosa->lock, flags); 1389} 1390 1391/* 1392 * Check if the whole buffer is DMA-able. It means it is below the 16M of 1393 * physical memory and doesn't span the 64k boundary. For now it seems 1394 * SKB's never do this, but we'll check this anyway. 1395 */ 1396static int cosa_dma_able(struct channel_data *chan, char *buf, int len) 1397{ 1398 static int count; 1399 unsigned long b = (unsigned long)buf; 1400 if (b+len >= MAX_DMA_ADDRESS) 1401 return 0; 1402 if ((b^ (b+len)) & 0x10000) { 1403 if (count++ < 5) 1404 printk(KERN_INFO "%s: packet spanning a 64k boundary\n", 1405 chan->name); 1406 return 0; 1407 } 1408 return 1; 1409} 1410 1411 1412/* ---------- The SRP/COSA ROM monitor functions ---------- */ 1413 1414/* 1415 * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=", 1416 * drivers need to say 4-digit hex number meaning start address of the microcode 1417 * separated by a single space. Monitor replies by saying " =". Now driver 1418 * has to write 4-digit hex number meaning the last byte address ended 1419 * by a single space. Monitor has to reply with a space. Now the download 1420 * begins. After the download monitor replies with "\r\n." (CR LF dot). 1421 */ 1422static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address) 1423{ 1424 int i; 1425 1426 if (put_wait_data(cosa, 'w') == -1) return -1; 1427 if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;} 1428 if (get_wait_data(cosa) != '=') return -3; 1429 1430 if (puthexnumber(cosa, address) < 0) return -4; 1431 if (put_wait_data(cosa, ' ') == -1) return -10; 1432 if (get_wait_data(cosa) != ' ') return -11; 1433 if (get_wait_data(cosa) != '=') return -12; 1434 1435 if (puthexnumber(cosa, address+length-1) < 0) return -13; 1436 if (put_wait_data(cosa, ' ') == -1) return -18; 1437 if (get_wait_data(cosa) != ' ') return -19; 1438 1439 while (length--) { 1440 char c; 1441#ifndef SRP_DOWNLOAD_AT_BOOT 1442 if (get_user(c, microcode)) 1443 return -23; /* ??? */ 1444#else 1445 c = *microcode; 1446#endif 1447 if (put_wait_data(cosa, c) == -1) 1448 return -20; 1449 microcode++; 1450 } 1451 1452 if (get_wait_data(cosa) != '\r') return -21; 1453 if (get_wait_data(cosa) != '\n') return -22; 1454 if (get_wait_data(cosa) != '.') return -23; 1455#if 0 1456 printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num); 1457#endif 1458 return 0; 1459} 1460 1461 1462/* 1463 * Starting microcode is done via the "g" command of the SRP monitor. 1464 * The chat should be the following: "g" "g=" "<addr><CR>" 1465 * "<CR><CR><LF><CR><LF>". 1466 */ 1467static int startmicrocode(struct cosa_data *cosa, int address) 1468{ 1469 if (put_wait_data(cosa, 'g') == -1) return -1; 1470 if (get_wait_data(cosa) != 'g') return -2; 1471 if (get_wait_data(cosa) != '=') return -3; 1472 1473 if (puthexnumber(cosa, address) < 0) return -4; 1474 if (put_wait_data(cosa, '\r') == -1) return -5; 1475 1476 if (get_wait_data(cosa) != '\r') return -6; 1477 if (get_wait_data(cosa) != '\r') return -7; 1478 if (get_wait_data(cosa) != '\n') return -8; 1479 if (get_wait_data(cosa) != '\r') return -9; 1480 if (get_wait_data(cosa) != '\n') return -10; 1481#if 0 1482 printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num); 1483#endif 1484 return 0; 1485} 1486 1487/* 1488 * Reading memory is done via the "r" command of the SRP monitor. 1489 * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " " 1490 * Then driver can read the data and the conversation is finished 1491 * by SRP monitor sending "<CR><LF>." (dot at the end). 1492 * 1493 * This routine is not needed during the normal operation and serves 1494 * for debugging purposes only. 1495 */ 1496static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address) 1497{ 1498 if (put_wait_data(cosa, 'r') == -1) return -1; 1499 if ((get_wait_data(cosa)) != 'r') return -2; 1500 if ((get_wait_data(cosa)) != '=') return -3; 1501 1502 if (puthexnumber(cosa, address) < 0) return -4; 1503 if (put_wait_data(cosa, ' ') == -1) return -5; 1504 if (get_wait_data(cosa) != ' ') return -6; 1505 if (get_wait_data(cosa) != '=') return -7; 1506 1507 if (puthexnumber(cosa, address+length-1) < 0) return -8; 1508 if (put_wait_data(cosa, ' ') == -1) return -9; 1509 if (get_wait_data(cosa) != ' ') return -10; 1510 1511 while (length--) { 1512 char c; 1513 int i; 1514 if ((i=get_wait_data(cosa)) == -1) { 1515 printk (KERN_INFO "cosa: 0x%04x bytes remaining\n", 1516 length); 1517 return -11; 1518 } 1519 c=i; 1520#if 1 1521 if (put_user(c, microcode)) 1522 return -23; /* ??? */ 1523#else 1524 *microcode = c; 1525#endif 1526 microcode++; 1527 } 1528 1529 if (get_wait_data(cosa) != '\r') return -21; 1530 if (get_wait_data(cosa) != '\n') return -22; 1531 if (get_wait_data(cosa) != '.') return -23; 1532#if 0 1533 printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num); 1534#endif 1535 return 0; 1536} 1537 1538/* 1539 * This function resets the device and reads the initial prompt 1540 * of the device's ROM monitor. 1541 */ 1542static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring) 1543{ 1544 int i=0, id=0, prev=0, curr=0; 1545 1546 /* Reset the card ... */ 1547 cosa_putstatus(cosa, 0); 1548 cosa_getdata8(cosa); 1549 cosa_putstatus(cosa, SR_RST); 1550#ifdef MODULE 1551 msleep(500); 1552#else 1553 udelay(5*100000); 1554#endif 1555 /* Disable all IRQs from the card */ 1556 cosa_putstatus(cosa, 0); 1557 1558 /* 1559 * Try to read the ID string. The card then prints out the 1560 * identification string ended by the "\n\x2e". 1561 * 1562 * The following loop is indexed through i (instead of id) 1563 * to avoid looping forever when for any reason 1564 * the port returns '\r', '\n' or '\x2e' permanently. 1565 */ 1566 for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) { 1567 if ((curr = get_wait_data(cosa)) == -1) { 1568 return -1; 1569 } 1570 curr &= 0xff; 1571 if (curr != '\r' && curr != '\n' && curr != 0x2e) 1572 idstring[id++] = curr; 1573 if (curr == 0x2e && prev == '\n') 1574 break; 1575 } 1576 /* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */ 1577 idstring[id] = '\0'; 1578 return id; 1579} 1580 1581 1582/* ---------- Auxiliary routines for COSA/SRP monitor ---------- */ 1583 1584/* 1585 * This routine gets the data byte from the card waiting for the SR_RX_RDY 1586 * bit to be set in a loop. It should be used in the exceptional cases 1587 * only (for example when resetting the card or downloading the firmware. 1588 */ 1589static int get_wait_data(struct cosa_data *cosa) 1590{ 1591 int retries = 1000; 1592 1593 while (--retries) { 1594 /* read data and return them */ 1595 if (cosa_getstatus(cosa) & SR_RX_RDY) { 1596 short r; 1597 r = cosa_getdata8(cosa); 1598#if 0 1599 printk(KERN_INFO "cosa: get_wait_data returning after %d retries\n", 999-retries); 1600#endif 1601 return r; 1602 } 1603 /* sleep if not ready to read */ 1604 schedule_timeout_interruptible(1); 1605 } 1606 printk(KERN_INFO "cosa: timeout in get_wait_data (status 0x%x)\n", 1607 cosa_getstatus(cosa)); 1608 return -1; 1609} 1610 1611/* 1612 * This routine puts the data byte to the card waiting for the SR_TX_RDY 1613 * bit to be set in a loop. It should be used in the exceptional cases 1614 * only (for example when resetting the card or downloading the firmware). 1615 */ 1616static int put_wait_data(struct cosa_data *cosa, int data) 1617{ 1618 int retries = 1000; 1619 while (--retries) { 1620 /* read data and return them */ 1621 if (cosa_getstatus(cosa) & SR_TX_RDY) { 1622 cosa_putdata8(cosa, data); 1623#if 0 1624 printk(KERN_INFO "Putdata: %d retries\n", 999-retries); 1625#endif 1626 return 0; 1627 } 1628#if 0 1629 /* sleep if not ready to read */ 1630 schedule_timeout_interruptible(1); 1631#endif 1632 } 1633 printk(KERN_INFO "cosa%d: timeout in put_wait_data (status 0x%x)\n", 1634 cosa->num, cosa_getstatus(cosa)); 1635 return -1; 1636} 1637 1638/* 1639 * The following routine puts the hexadecimal number into the SRP monitor 1640 * and verifies the proper echo of the sent bytes. Returns 0 on success, 1641 * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed, 1642 * (-2,-4,-6,-8) means that reading echo failed. 1643 */ 1644static int puthexnumber(struct cosa_data *cosa, int number) 1645{ 1646 char temp[5]; 1647 int i; 1648 1649 /* Well, I should probably replace this by something faster. */ 1650 sprintf(temp, "%04X", number); 1651 for (i=0; i<4; i++) { 1652 if (put_wait_data(cosa, temp[i]) == -1) { 1653 printk(KERN_NOTICE "cosa%d: puthexnumber failed to write byte %d\n", 1654 cosa->num, i); 1655 return -1-2*i; 1656 } 1657 if (get_wait_data(cosa) != temp[i]) { 1658 printk(KERN_NOTICE "cosa%d: puthexhumber failed to read echo of byte %d\n", 1659 cosa->num, i); 1660 return -2-2*i; 1661 } 1662 } 1663 return 0; 1664} 1665 1666 1667/* ---------- Interrupt routines ---------- */ 1668 1669/* 1670 * There are three types of interrupt: 1671 * At the beginning of transmit - this handled is in tx_interrupt(), 1672 * at the beginning of receive - it is in rx_interrupt() and 1673 * at the end of transmit/receive - it is the eot_interrupt() function. 1674 * These functions are multiplexed by cosa_interrupt() according to the 1675 * COSA status byte. I have moved the rx/tx/eot interrupt handling into 1676 * separate functions to make it more readable. These functions are inline, 1677 * so there should be no overhead of function call. 1678 * 1679 * In the COSA bus-master mode, we need to tell the card the address of a 1680 * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait. 1681 * It's time to use the bottom half :-( 1682 */ 1683 1684/* 1685 * Transmit interrupt routine - called when COSA is willing to obtain 1686 * data from the OS. The most tricky part of the routine is selection 1687 * of channel we (OS) want to send packet for. For SRP we should probably 1688 * use the round-robin approach. The newer COSA firmwares have a simple 1689 * flow-control - in the status word has bits 2 and 3 set to 1 means that the 1690 * channel 0 or 1 doesn't want to receive data. 1691 * 1692 * It seems there is a bug in COSA firmware (need to trace it further): 1693 * When the driver status says that the kernel has no more data for transmit 1694 * (e.g. at the end of TX DMA) and then the kernel changes its mind 1695 * (e.g. new packet is queued to hard_start_xmit()), the card issues 1696 * the TX interrupt but does not mark the channel as ready-to-transmit. 1697 * The fix seems to be to push the packet to COSA despite its request. 1698 * We first try to obey the card's opinion, and then fall back to forced TX. 1699 */ 1700static inline void tx_interrupt(struct cosa_data *cosa, int status) 1701{ 1702 unsigned long flags, flags1; 1703#ifdef DEBUG_IRQS 1704 printk(KERN_INFO "cosa%d: SR_DOWN_REQUEST status=0x%04x\n", 1705 cosa->num, status); 1706#endif 1707 spin_lock_irqsave(&cosa->lock, flags); 1708 set_bit(TXBIT, &cosa->rxtx); 1709 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1710 /* flow control, see the comment above */ 1711 int i=0; 1712 if (!cosa->txbitmap) { 1713 printk(KERN_WARNING "%s: No channel wants data " 1714 "in TX IRQ. Expect DMA timeout.", 1715 cosa->name); 1716 put_driver_status_nolock(cosa); 1717 clear_bit(TXBIT, &cosa->rxtx); 1718 spin_unlock_irqrestore(&cosa->lock, flags); 1719 return; 1720 } 1721 while(1) { 1722 cosa->txchan++; 1723 i++; 1724 if (cosa->txchan >= cosa->nchannels) 1725 cosa->txchan = 0; 1726 if (!(cosa->txbitmap & (1<<cosa->txchan))) 1727 continue; 1728 if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT))) 1729 break; 1730 /* in second pass, accept first ready-to-TX channel */ 1731 if (i > cosa->nchannels) { 1732 /* Can be safely ignored */ 1733#ifdef DEBUG_IRQS 1734 printk(KERN_DEBUG "%s: Forcing TX " 1735 "to not-ready channel %d\n", 1736 cosa->name, cosa->txchan); 1737#endif 1738 break; 1739 } 1740 } 1741 1742 cosa->txsize = cosa->chan[cosa->txchan].txsize; 1743 if (cosa_dma_able(cosa->chan+cosa->txchan, 1744 cosa->chan[cosa->txchan].txbuf, cosa->txsize)) { 1745 cosa->txbuf = cosa->chan[cosa->txchan].txbuf; 1746 } else { 1747 memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf, 1748 cosa->txsize); 1749 cosa->txbuf = cosa->bouncebuf; 1750 } 1751 } 1752 1753 if (is_8bit(cosa)) { 1754 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1755 cosa_putstatus(cosa, SR_TX_INT_ENA); 1756 cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)| 1757 ((cosa->txsize >> 8) & 0x1f)); 1758#ifdef DEBUG_IO 1759 debug_status_out(cosa, SR_TX_INT_ENA); 1760 debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)| 1761 ((cosa->txsize >> 8) & 0x1f)); 1762 debug_data_in(cosa, cosa_getdata8(cosa)); 1763#else 1764 cosa_getdata8(cosa); 1765#endif 1766 set_bit(IRQBIT, &cosa->rxtx); 1767 spin_unlock_irqrestore(&cosa->lock, flags); 1768 return; 1769 } else { 1770 clear_bit(IRQBIT, &cosa->rxtx); 1771 cosa_putstatus(cosa, 0); 1772 cosa_putdata8(cosa, cosa->txsize&0xff); 1773#ifdef DEBUG_IO 1774 debug_status_out(cosa, 0); 1775 debug_data_out(cosa, cosa->txsize&0xff); 1776#endif 1777 } 1778 } else { 1779 cosa_putstatus(cosa, SR_TX_INT_ENA); 1780 cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000) 1781 | (cosa->txsize & 0x1fff)); 1782#ifdef DEBUG_IO 1783 debug_status_out(cosa, SR_TX_INT_ENA); 1784 debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000) 1785 | (cosa->txsize & 0x1fff)); 1786 debug_data_in(cosa, cosa_getdata8(cosa)); 1787 debug_status_out(cosa, 0); 1788#else 1789 cosa_getdata8(cosa); 1790#endif 1791 cosa_putstatus(cosa, 0); 1792 } 1793 1794 if (cosa->busmaster) { 1795 unsigned long addr = virt_to_bus(cosa->txbuf); 1796 int count=0; 1797 printk(KERN_INFO "busmaster IRQ\n"); 1798 while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { 1799 count++; 1800 udelay(10); 1801 if (count > 1000) break; 1802 } 1803 printk(KERN_INFO "status %x\n", cosa_getstatus(cosa)); 1804 printk(KERN_INFO "ready after %d loops\n", count); 1805 cosa_putdata16(cosa, (addr >> 16)&0xffff); 1806 1807 count = 0; 1808 while (!(cosa_getstatus(cosa)&SR_TX_RDY)) { 1809 count++; 1810 if (count > 1000) break; 1811 udelay(10); 1812 } 1813 printk(KERN_INFO "ready after %d loops\n", count); 1814 cosa_putdata16(cosa, addr &0xffff); 1815 flags1 = claim_dma_lock(); 1816 set_dma_mode(cosa->dma, DMA_MODE_CASCADE); 1817 enable_dma(cosa->dma); 1818 release_dma_lock(flags1); 1819 } else { 1820 /* start the DMA */ 1821 flags1 = claim_dma_lock(); 1822 disable_dma(cosa->dma); 1823 clear_dma_ff(cosa->dma); 1824 set_dma_mode(cosa->dma, DMA_MODE_WRITE); 1825 set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf)); 1826 set_dma_count(cosa->dma, cosa->txsize); 1827 enable_dma(cosa->dma); 1828 release_dma_lock(flags1); 1829 } 1830 cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); 1831#ifdef DEBUG_IO 1832 debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA); 1833#endif 1834 spin_unlock_irqrestore(&cosa->lock, flags); 1835} 1836 1837static inline void rx_interrupt(struct cosa_data *cosa, int status) 1838{ 1839 unsigned long flags; 1840#ifdef DEBUG_IRQS 1841 printk(KERN_INFO "cosa%d: SR_UP_REQUEST\n", cosa->num); 1842#endif 1843 1844 spin_lock_irqsave(&cosa->lock, flags); 1845 set_bit(RXBIT, &cosa->rxtx); 1846 1847 if (is_8bit(cosa)) { 1848 if (!test_bit(IRQBIT, &cosa->rxtx)) { 1849 set_bit(IRQBIT, &cosa->rxtx); 1850 put_driver_status_nolock(cosa); 1851 cosa->rxsize = cosa_getdata8(cosa) <<8; 1852#ifdef DEBUG_IO 1853 debug_data_in(cosa, cosa->rxsize >> 8); 1854#endif 1855 spin_unlock_irqrestore(&cosa->lock, flags); 1856 return; 1857 } else { 1858 clear_bit(IRQBIT, &cosa->rxtx); 1859 cosa->rxsize |= cosa_getdata8(cosa) & 0xff; 1860#ifdef DEBUG_IO 1861 debug_data_in(cosa, cosa->rxsize & 0xff); 1862#endif 1863#if 0 1864 printk(KERN_INFO "cosa%d: receive rxsize = (0x%04x).\n", 1865 cosa->num, cosa->rxsize); 1866#endif 1867 } 1868 } else { 1869 cosa->rxsize = cosa_getdata16(cosa); 1870#ifdef DEBUG_IO 1871 debug_data_in(cosa, cosa->rxsize); 1872#endif 1873#if 0 1874 printk(KERN_INFO "cosa%d: receive rxsize = (0x%04x).\n", 1875 cosa->num, cosa->rxsize); 1876#endif 1877 } 1878 if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) { 1879 printk(KERN_WARNING "%s: rx for unknown channel (0x%04x)\n", 1880 cosa->name, cosa->rxsize); 1881 spin_unlock_irqrestore(&cosa->lock, flags); 1882 goto reject; 1883 } 1884 cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13); 1885 cosa->rxsize &= 0x1fff; 1886 spin_unlock_irqrestore(&cosa->lock, flags); 1887 1888 cosa->rxbuf = NULL; 1889 if (cosa->rxchan->setup_rx) 1890 cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize); 1891 1892 if (!cosa->rxbuf) { 1893reject: /* Reject the packet */ 1894 printk(KERN_INFO "cosa%d: rejecting packet on channel %d\n", 1895 cosa->num, cosa->rxchan->num); 1896 cosa->rxbuf = cosa->bouncebuf; 1897 } 1898 1899 /* start the DMA */ 1900 flags = claim_dma_lock(); 1901 disable_dma(cosa->dma); 1902 clear_dma_ff(cosa->dma); 1903 set_dma_mode(cosa->dma, DMA_MODE_READ); 1904 if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) { 1905 set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf)); 1906 } else { 1907 set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf)); 1908 } 1909 set_dma_count(cosa->dma, (cosa->rxsize&0x1fff)); 1910 enable_dma(cosa->dma); 1911 release_dma_lock(flags); 1912 spin_lock_irqsave(&cosa->lock, flags); 1913 cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); 1914 if (!is_8bit(cosa) && (status & SR_TX_RDY)) 1915 cosa_putdata8(cosa, DRIVER_RX_READY); 1916#ifdef DEBUG_IO 1917 debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA); 1918 if (!is_8bit(cosa) && (status & SR_TX_RDY)) 1919 debug_data_cmd(cosa, DRIVER_RX_READY); 1920#endif 1921 spin_unlock_irqrestore(&cosa->lock, flags); 1922} 1923 1924static inline void eot_interrupt(struct cosa_data *cosa, int status) 1925{ 1926 unsigned long flags, flags1; 1927 spin_lock_irqsave(&cosa->lock, flags); 1928 flags1 = claim_dma_lock(); 1929 disable_dma(cosa->dma); 1930 clear_dma_ff(cosa->dma); 1931 release_dma_lock(flags1); 1932 if (test_bit(TXBIT, &cosa->rxtx)) { 1933 struct channel_data *chan = cosa->chan+cosa->txchan; 1934 if (chan->tx_done) 1935 if (chan->tx_done(chan, cosa->txsize)) 1936 clear_bit(chan->num, &cosa->txbitmap); 1937 } else if (test_bit(RXBIT, &cosa->rxtx)) { 1938#ifdef DEBUG_DATA 1939 { 1940 int i; 1941 printk(KERN_INFO "cosa%dc%d: done rx(0x%x)", cosa->num, 1942 cosa->rxchan->num, cosa->rxsize); 1943 for (i=0; i<cosa->rxsize; i++) 1944 printk (" %02x", cosa->rxbuf[i]&0xff); 1945 printk("\n"); 1946 } 1947#endif 1948 /* Packet for unknown channel? */ 1949 if (cosa->rxbuf == cosa->bouncebuf) 1950 goto out; 1951 if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize)) 1952 memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize); 1953 if (cosa->rxchan->rx_done) 1954 if (cosa->rxchan->rx_done(cosa->rxchan)) 1955 clear_bit(cosa->rxchan->num, &cosa->rxbitmap); 1956 } else { 1957 printk(KERN_NOTICE "cosa%d: unexpected EOT interrupt\n", 1958 cosa->num); 1959 } 1960 /* 1961 * Clear the RXBIT, TXBIT and IRQBIT (the latest should be 1962 * cleared anyway). We should do it as soon as possible 1963 * so that we can tell the COSA we are done and to give it a time 1964 * for recovery. 1965 */ 1966out: 1967 cosa->rxtx = 0; 1968 put_driver_status_nolock(cosa); 1969 spin_unlock_irqrestore(&cosa->lock, flags); 1970} 1971 1972static irqreturn_t cosa_interrupt(int irq, void *cosa_) 1973{ 1974 unsigned status; 1975 int count = 0; 1976 struct cosa_data *cosa = cosa_; 1977again: 1978 status = cosa_getstatus(cosa); 1979#ifdef DEBUG_IRQS 1980 printk(KERN_INFO "cosa%d: got IRQ, status 0x%02x\n", cosa->num, 1981 status & 0xff); 1982#endif 1983#ifdef DEBUG_IO 1984 debug_status_in(cosa, status); 1985#endif 1986 switch (status & SR_CMD_FROM_SRP_MASK) { 1987 case SR_DOWN_REQUEST: 1988 tx_interrupt(cosa, status); 1989 break; 1990 case SR_UP_REQUEST: 1991 rx_interrupt(cosa, status); 1992 break; 1993 case SR_END_OF_TRANSFER: 1994 eot_interrupt(cosa, status); 1995 break; 1996 default: 1997 /* We may be too fast for SRP. Try to wait a bit more. */ 1998 if (count++ < 100) { 1999 udelay(100); 2000 goto again; 2001 } 2002 printk(KERN_INFO "cosa%d: unknown status 0x%02x in IRQ after %d retries\n", 2003 cosa->num, status & 0xff, count); 2004 } 2005#ifdef DEBUG_IRQS 2006 if (count) 2007 printk(KERN_INFO "%s: %d-times got unknown status in IRQ\n", 2008 cosa->name, count); 2009 else 2010 printk(KERN_INFO "%s: returning from IRQ\n", cosa->name); 2011#endif 2012 return IRQ_HANDLED; 2013} 2014 2015 2016/* ---------- I/O debugging routines ---------- */ 2017/* 2018 * These routines can be used to monitor COSA/SRP I/O and to printk() 2019 * the data being transferred on the data and status I/O port in a 2020 * readable way. 2021 */ 2022 2023#ifdef DEBUG_IO 2024static void debug_status_in(struct cosa_data *cosa, int status) 2025{ 2026 char *s; 2027 switch(status & SR_CMD_FROM_SRP_MASK) { 2028 case SR_UP_REQUEST: 2029 s = "RX_REQ"; 2030 break; 2031 case SR_DOWN_REQUEST: 2032 s = "TX_REQ"; 2033 break; 2034 case SR_END_OF_TRANSFER: 2035 s = "ET_REQ"; 2036 break; 2037 default: 2038 s = "NO_REQ"; 2039 break; 2040 } 2041 printk(KERN_INFO "%s: IO: status -> 0x%02x (%s%s%s%s)\n", 2042 cosa->name, 2043 status, 2044 status & SR_USR_RQ ? "USR_RQ|":"", 2045 status & SR_TX_RDY ? "TX_RDY|":"", 2046 status & SR_RX_RDY ? "RX_RDY|":"", 2047 s); 2048} 2049 2050static void debug_status_out(struct cosa_data *cosa, int status) 2051{ 2052 printk(KERN_INFO "%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n", 2053 cosa->name, 2054 status, 2055 status & SR_RX_DMA_ENA ? "RXDMA|":"!rxdma|", 2056 status & SR_TX_DMA_ENA ? "TXDMA|":"!txdma|", 2057 status & SR_RST ? "RESET|":"", 2058 status & SR_USR_INT_ENA ? "USRINT|":"!usrint|", 2059 status & SR_TX_INT_ENA ? "TXINT|":"!txint|", 2060 status & SR_RX_INT_ENA ? "RXINT":"!rxint"); 2061} 2062 2063static void debug_data_in(struct cosa_data *cosa, int data) 2064{ 2065 printk(KERN_INFO "%s: IO: data -> 0x%04x\n", cosa->name, data); 2066} 2067 2068static void debug_data_out(struct cosa_data *cosa, int data) 2069{ 2070 printk(KERN_INFO "%s: IO: data <- 0x%04x\n", cosa->name, data); 2071} 2072 2073static void debug_data_cmd(struct cosa_data *cosa, int data) 2074{ 2075 printk(KERN_INFO "%s: IO: data <- 0x%04x (%s|%s)\n", 2076 cosa->name, data, 2077 data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy", 2078 data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy"); 2079} 2080#endif 2081 2082/* EOF -- this file has not been truncated */ 2083