Loading...
Note: File does not exist in v6.8.
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 */