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/signal.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_hw_array(io, int, ioport, NULL, 0);
 236MODULE_PARM_DESC(io, "The I/O bases of the COSA or SRP cards");
 237module_param_hw_array(irq, int, irq, NULL, 0);
 238MODULE_PARM_DESC(irq, "The IRQ lines of the COSA or SRP cards");
 239module_param_hw_array(dma, int, dma, 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_start_xmit = hdlc_start_xmit,
 436	.ndo_do_ioctl   = cosa_net_ioctl,
 437	.ndo_tx_timeout = cosa_net_timeout,
 438};
 439
 440static int cosa_probe(int base, int irq, int dma)
 441{
 442	struct cosa_data *cosa = cosa_cards+nr_cards;
 443	int i, err = 0;
 444
 445	memset(cosa, 0, sizeof(struct cosa_data));
 446
 447	/* Checking validity of parameters: */
 448	/* IRQ should be 2-7 or 10-15; negative IRQ means autoprobe */
 449	if ((irq >= 0  && irq < 2) || irq > 15 || (irq < 10 && irq > 7)) {
 450		pr_info("invalid IRQ %d\n", irq);
 451		return -1;
 452	}
 453	/* I/O address should be between 0x100 and 0x3ff and should be
 454	 * multiple of 8. */
 455	if (base < 0x100 || base > 0x3ff || base & 0x7) {
 456		pr_info("invalid I/O address 0x%x\n", base);
 457		return -1;
 458	}
 459	/* DMA should be 0,1 or 3-7 */
 460	if (dma < 0 || dma == 4 || dma > 7) {
 461		pr_info("invalid DMA %d\n", dma);
 462		return -1;
 463	}
 464	/* and finally, on 16-bit COSA DMA should be 4-7 and 
 465	 * I/O base should not be multiple of 0x10 */
 466	if (((base & 0x8) && dma < 4) || (!(base & 0x8) && dma > 3)) {
 467		pr_info("8/16 bit base and DMA mismatch (base=0x%x, dma=%d)\n",
 468			base, dma);
 469		return -1;
 470	}
 471
 472	cosa->dma = dma;
 473	cosa->datareg = base;
 474	cosa->statusreg = is_8bit(cosa)?base+1:base+2;
 475	spin_lock_init(&cosa->lock);
 476
 477	if (!request_region(base, is_8bit(cosa)?2:4,"cosa"))
 478		return -1;
 479	
 480	if (cosa_reset_and_read_id(cosa, cosa->id_string) < 0) {
 481		printk(KERN_DEBUG "probe at 0x%x failed.\n", base);
 482		err = -1;
 483		goto err_out;
 484	}
 485
 486	/* Test the validity of identification string */
 487	if (!strncmp(cosa->id_string, "SRP", 3))
 488		cosa->type = "srp";
 489	else if (!strncmp(cosa->id_string, "COSA", 4))
 490		cosa->type = is_8bit(cosa)? "cosa8": "cosa16";
 491	else {
 492/* Print a warning only if we are not autoprobing */
 493#ifndef COSA_ISA_AUTOPROBE
 494		pr_info("valid signature not found at 0x%x\n", base);
 495#endif
 496		err = -1;
 497		goto err_out;
 498	}
 499	/* Update the name of the region now we know the type of card */ 
 500	release_region(base, is_8bit(cosa)?2:4);
 501	if (!request_region(base, is_8bit(cosa)?2:4, cosa->type)) {
 502		printk(KERN_DEBUG "changing name at 0x%x failed.\n", base);
 503		return -1;
 504	}
 505
 506	/* Now do IRQ autoprobe */
 507	if (irq < 0) {
 508		unsigned long irqs;
 509/*		pr_info("IRQ autoprobe\n"); */
 510		irqs = probe_irq_on();
 511		/* 
 512		 * Enable interrupt on tx buffer empty (it sure is) 
 513		 * really sure ?
 514		 * FIXME: When this code is not used as module, we should
 515		 * probably call udelay() instead of the interruptible sleep.
 516		 */
 517		set_current_state(TASK_INTERRUPTIBLE);
 518		cosa_putstatus(cosa, SR_TX_INT_ENA);
 519		schedule_timeout(msecs_to_jiffies(300));
 520		irq = probe_irq_off(irqs);
 521		/* Disable all IRQs from the card */
 522		cosa_putstatus(cosa, 0);
 523		/* Empty the received data register */
 524		cosa_getdata8(cosa);
 525
 526		if (irq < 0) {
 527			pr_info("multiple interrupts obtained (%d, board at 0x%x)\n",
 528				irq, cosa->datareg);
 529			err = -1;
 530			goto err_out;
 531		}
 532		if (irq == 0) {
 533			pr_info("no interrupt obtained (board at 0x%x)\n",
 534				cosa->datareg);
 535		/*	return -1; */
 536		}
 537	}
 538
 539	cosa->irq = irq;
 540	cosa->num = nr_cards;
 541	cosa->usage = 0;
 542	cosa->nchannels = 2;	/* FIXME: how to determine this? */
 543
 544	if (request_irq(cosa->irq, cosa_interrupt, 0, cosa->type, cosa)) {
 545		err = -1;
 546		goto err_out;
 547	}
 548	if (request_dma(cosa->dma, cosa->type)) {
 549		err = -1;
 550		goto err_out1;
 551	}
 552	
 553	cosa->bouncebuf = kmalloc(COSA_MTU, GFP_KERNEL|GFP_DMA);
 554	if (!cosa->bouncebuf) {
 555		err = -ENOMEM;
 556		goto err_out2;
 557	}
 558	sprintf(cosa->name, "cosa%d", cosa->num);
 559
 560	/* Initialize the per-channel data */
 561	cosa->chan = kcalloc(cosa->nchannels, sizeof(struct channel_data), GFP_KERNEL);
 562	if (!cosa->chan) {
 563		err = -ENOMEM;
 564		goto err_out3;
 565	}
 566
 567	for (i = 0; i < cosa->nchannels; i++) {
 568		struct channel_data *chan = &cosa->chan[i];
 569
 570		chan->cosa = cosa;
 571		chan->num = i;
 572		sprintf(chan->name, "cosa%dc%d", chan->cosa->num, i);
 573
 574		/* Initialize the chardev data structures */
 575		mutex_init(&chan->rlock);
 576		sema_init(&chan->wsem, 1);
 577
 578		/* Register the network interface */
 579		if (!(chan->netdev = alloc_hdlcdev(chan))) {
 580			pr_warn("%s: alloc_hdlcdev failed\n", chan->name);
 581			err = -ENOMEM;
 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		err = register_hdlc_device(chan->netdev);
 592		if (err) {
 593			netdev_warn(chan->netdev,
 594				    "register_hdlc_device() failed\n");
 595			free_netdev(chan->netdev);
 596			goto err_hdlcdev;
 597		}
 598	}
 599
 600	pr_info("cosa%d: %s (%s at 0x%x irq %d dma %d), %d channels\n",
 601		cosa->num, cosa->id_string, cosa->type,
 602		cosa->datareg, cosa->irq, cosa->dma, cosa->nchannels);
 603
 604	return nr_cards++;
 605
 606err_hdlcdev:
 607	while (i-- > 0) {
 608		unregister_hdlc_device(cosa->chan[i].netdev);
 609		free_netdev(cosa->chan[i].netdev);
 610	}
 611	kfree(cosa->chan);
 612err_out3:
 613	kfree(cosa->bouncebuf);
 614err_out2:
 615	free_dma(cosa->dma);
 616err_out1:
 617	free_irq(cosa->irq, cosa);
 618err_out:
 619	release_region(cosa->datareg,is_8bit(cosa)?2:4);
 620	pr_notice("cosa%d: allocating resources failed\n", cosa->num);
 621	return err;
 622}
 623
 624
 625/*---------- network device ---------- */
 626
 627static int cosa_net_attach(struct net_device *dev, unsigned short encoding,
 628			   unsigned short parity)
 629{
 630	if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 631		return 0;
 632	return -EINVAL;
 633}
 634
 635static int cosa_net_open(struct net_device *dev)
 636{
 637	struct channel_data *chan = dev_to_chan(dev);
 638	int err;
 639	unsigned long flags;
 640
 641	if (!(chan->cosa->firmware_status & COSA_FW_START)) {
 642		pr_notice("%s: start the firmware first (status %d)\n",
 643			  chan->cosa->name, chan->cosa->firmware_status);
 644		return -EPERM;
 645	}
 646	spin_lock_irqsave(&chan->cosa->lock, flags);
 647	if (chan->usage != 0) {
 648		pr_warn("%s: cosa_net_open called with usage count %d\n",
 649			chan->name, chan->usage);
 650		spin_unlock_irqrestore(&chan->cosa->lock, flags);
 651		return -EBUSY;
 652	}
 653	chan->setup_rx = cosa_net_setup_rx;
 654	chan->tx_done = cosa_net_tx_done;
 655	chan->rx_done = cosa_net_rx_done;
 656	chan->usage = -1;
 657	chan->cosa->usage++;
 658	spin_unlock_irqrestore(&chan->cosa->lock, flags);
 659
 660	err = hdlc_open(dev);
 661	if (err) {
 662		spin_lock_irqsave(&chan->cosa->lock, flags);
 663		chan->usage = 0;
 664		chan->cosa->usage--;
 665		spin_unlock_irqrestore(&chan->cosa->lock, flags);
 666		return err;
 667	}
 668
 669	netif_start_queue(dev);
 670	cosa_enable_rx(chan);
 671	return 0;
 672}
 673
 674static netdev_tx_t cosa_net_tx(struct sk_buff *skb,
 675				     struct net_device *dev)
 676{
 677	struct channel_data *chan = dev_to_chan(dev);
 678
 679	netif_stop_queue(dev);
 680
 681	chan->tx_skb = skb;
 682	cosa_start_tx(chan, skb->data, skb->len);
 683	return NETDEV_TX_OK;
 684}
 685
 686static void cosa_net_timeout(struct net_device *dev)
 687{
 688	struct channel_data *chan = dev_to_chan(dev);
 689
 690	if (test_bit(RXBIT, &chan->cosa->rxtx)) {
 691		chan->netdev->stats.rx_errors++;
 692		chan->netdev->stats.rx_missed_errors++;
 693	} else {
 694		chan->netdev->stats.tx_errors++;
 695		chan->netdev->stats.tx_aborted_errors++;
 696	}
 697	cosa_kick(chan->cosa);
 698	if (chan->tx_skb) {
 699		dev_kfree_skb(chan->tx_skb);
 700		chan->tx_skb = NULL;
 701	}
 702	netif_wake_queue(dev);
 703}
 704
 705static int cosa_net_close(struct net_device *dev)
 706{
 707	struct channel_data *chan = dev_to_chan(dev);
 708	unsigned long flags;
 709
 710	netif_stop_queue(dev);
 711	hdlc_close(dev);
 712	cosa_disable_rx(chan);
 713	spin_lock_irqsave(&chan->cosa->lock, flags);
 714	if (chan->rx_skb) {
 715		kfree_skb(chan->rx_skb);
 716		chan->rx_skb = NULL;
 717	}
 718	if (chan->tx_skb) {
 719		kfree_skb(chan->tx_skb);
 720		chan->tx_skb = NULL;
 721	}
 722	chan->usage = 0;
 723	chan->cosa->usage--;
 724	spin_unlock_irqrestore(&chan->cosa->lock, flags);
 725	return 0;
 726}
 727
 728static char *cosa_net_setup_rx(struct channel_data *chan, int size)
 729{
 730	/*
 731	 * We can safely fall back to non-dma-able memory, because we have
 732	 * the cosa->bouncebuf pre-allocated.
 733	 */
 734	kfree_skb(chan->rx_skb);
 735	chan->rx_skb = dev_alloc_skb(size);
 736	if (chan->rx_skb == NULL) {
 737		pr_notice("%s: Memory squeeze, dropping packet\n", chan->name);
 738		chan->netdev->stats.rx_dropped++;
 739		return NULL;
 740	}
 741	netif_trans_update(chan->netdev);
 742	return skb_put(chan->rx_skb, size);
 743}
 744
 745static int cosa_net_rx_done(struct channel_data *chan)
 746{
 747	if (!chan->rx_skb) {
 748		pr_warn("%s: rx_done with empty skb!\n", chan->name);
 749		chan->netdev->stats.rx_errors++;
 750		chan->netdev->stats.rx_frame_errors++;
 751		return 0;
 752	}
 753	chan->rx_skb->protocol = hdlc_type_trans(chan->rx_skb, chan->netdev);
 754	chan->rx_skb->dev = chan->netdev;
 755	skb_reset_mac_header(chan->rx_skb);
 756	chan->netdev->stats.rx_packets++;
 757	chan->netdev->stats.rx_bytes += chan->cosa->rxsize;
 758	netif_rx(chan->rx_skb);
 759	chan->rx_skb = NULL;
 760	return 0;
 761}
 762
 763/* ARGSUSED */
 764static int cosa_net_tx_done(struct channel_data *chan, int size)
 765{
 766	if (!chan->tx_skb) {
 767		pr_warn("%s: tx_done with empty skb!\n", chan->name);
 768		chan->netdev->stats.tx_errors++;
 769		chan->netdev->stats.tx_aborted_errors++;
 770		return 1;
 771	}
 772	dev_kfree_skb_irq(chan->tx_skb);
 773	chan->tx_skb = NULL;
 774	chan->netdev->stats.tx_packets++;
 775	chan->netdev->stats.tx_bytes += size;
 776	netif_wake_queue(chan->netdev);
 777	return 1;
 778}
 779
 780/*---------- Character device ---------- */
 781
 782static ssize_t cosa_read(struct file *file,
 783	char __user *buf, size_t count, loff_t *ppos)
 784{
 785	DECLARE_WAITQUEUE(wait, current);
 786	unsigned long flags;
 787	struct channel_data *chan = file->private_data;
 788	struct cosa_data *cosa = chan->cosa;
 789	char *kbuf;
 790
 791	if (!(cosa->firmware_status & COSA_FW_START)) {
 792		pr_notice("%s: start the firmware first (status %d)\n",
 793			  cosa->name, cosa->firmware_status);
 794		return -EPERM;
 795	}
 796	if (mutex_lock_interruptible(&chan->rlock))
 797		return -ERESTARTSYS;
 798	
 799	chan->rxdata = kmalloc(COSA_MTU, GFP_DMA|GFP_KERNEL);
 800	if (chan->rxdata == NULL) {
 801		mutex_unlock(&chan->rlock);
 802		return -ENOMEM;
 803	}
 804
 805	chan->rx_status = 0;
 806	cosa_enable_rx(chan);
 807	spin_lock_irqsave(&cosa->lock, flags);
 808	add_wait_queue(&chan->rxwaitq, &wait);
 809	while (!chan->rx_status) {
 810		set_current_state(TASK_INTERRUPTIBLE);
 811		spin_unlock_irqrestore(&cosa->lock, flags);
 812		schedule();
 813		spin_lock_irqsave(&cosa->lock, flags);
 814		if (signal_pending(current) && chan->rx_status == 0) {
 815			chan->rx_status = 1;
 816			remove_wait_queue(&chan->rxwaitq, &wait);
 817			__set_current_state(TASK_RUNNING);
 818			spin_unlock_irqrestore(&cosa->lock, flags);
 819			mutex_unlock(&chan->rlock);
 820			return -ERESTARTSYS;
 821		}
 822	}
 823	remove_wait_queue(&chan->rxwaitq, &wait);
 824	__set_current_state(TASK_RUNNING);
 825	kbuf = chan->rxdata;
 826	count = chan->rxsize;
 827	spin_unlock_irqrestore(&cosa->lock, flags);
 828	mutex_unlock(&chan->rlock);
 829
 830	if (copy_to_user(buf, kbuf, count)) {
 831		kfree(kbuf);
 832		return -EFAULT;
 833	}
 834	kfree(kbuf);
 835	return count;
 836}
 837
 838static char *chrdev_setup_rx(struct channel_data *chan, int size)
 839{
 840	/* Expect size <= COSA_MTU */
 841	chan->rxsize = size;
 842	return chan->rxdata;
 843}
 844
 845static int chrdev_rx_done(struct channel_data *chan)
 846{
 847	if (chan->rx_status) { /* Reader has died */
 848		kfree(chan->rxdata);
 849		up(&chan->wsem);
 850	}
 851	chan->rx_status = 1;
 852	wake_up_interruptible(&chan->rxwaitq);
 853	return 1;
 854}
 855
 856
 857static ssize_t cosa_write(struct file *file,
 858	const char __user *buf, size_t count, loff_t *ppos)
 859{
 860	DECLARE_WAITQUEUE(wait, current);
 861	struct channel_data *chan = file->private_data;
 862	struct cosa_data *cosa = chan->cosa;
 863	unsigned long flags;
 864	char *kbuf;
 865
 866	if (!(cosa->firmware_status & COSA_FW_START)) {
 867		pr_notice("%s: start the firmware first (status %d)\n",
 868			  cosa->name, cosa->firmware_status);
 869		return -EPERM;
 870	}
 871	if (down_interruptible(&chan->wsem))
 872		return -ERESTARTSYS;
 873
 874	if (count > COSA_MTU)
 875		count = COSA_MTU;
 876	
 877	/* Allocate the buffer */
 878	kbuf = kmalloc(count, GFP_KERNEL|GFP_DMA);
 879	if (kbuf == NULL) {
 880		up(&chan->wsem);
 881		return -ENOMEM;
 882	}
 883	if (copy_from_user(kbuf, buf, count)) {
 884		up(&chan->wsem);
 885		kfree(kbuf);
 886		return -EFAULT;
 887	}
 888	chan->tx_status=0;
 889	cosa_start_tx(chan, kbuf, count);
 890
 891	spin_lock_irqsave(&cosa->lock, flags);
 892	add_wait_queue(&chan->txwaitq, &wait);
 893	while (!chan->tx_status) {
 894		set_current_state(TASK_INTERRUPTIBLE);
 895		spin_unlock_irqrestore(&cosa->lock, flags);
 896		schedule();
 897		spin_lock_irqsave(&cosa->lock, flags);
 898		if (signal_pending(current) && chan->tx_status == 0) {
 899			chan->tx_status = 1;
 900			remove_wait_queue(&chan->txwaitq, &wait);
 901			__set_current_state(TASK_RUNNING);
 902			chan->tx_status = 1;
 903			spin_unlock_irqrestore(&cosa->lock, flags);
 904			up(&chan->wsem);
 905			return -ERESTARTSYS;
 906		}
 907	}
 908	remove_wait_queue(&chan->txwaitq, &wait);
 909	__set_current_state(TASK_RUNNING);
 910	up(&chan->wsem);
 911	spin_unlock_irqrestore(&cosa->lock, flags);
 912	kfree(kbuf);
 913	return count;
 914}
 915
 916static int chrdev_tx_done(struct channel_data *chan, int size)
 917{
 918	if (chan->tx_status) { /* Writer was interrupted */
 919		kfree(chan->txbuf);
 920		up(&chan->wsem);
 921	}
 922	chan->tx_status = 1;
 923	wake_up_interruptible(&chan->txwaitq);
 924	return 1;
 925}
 926
 927static __poll_t cosa_poll(struct file *file, poll_table *poll)
 928{
 929	pr_info("cosa_poll is here\n");
 930	return 0;
 931}
 932
 933static int cosa_open(struct inode *inode, struct file *file)
 934{
 935	struct cosa_data *cosa;
 936	struct channel_data *chan;
 937	unsigned long flags;
 938	int n;
 939	int ret = 0;
 940
 941	mutex_lock(&cosa_chardev_mutex);
 942	if ((n=iminor(file_inode(file))>>CARD_MINOR_BITS)
 943		>= nr_cards) {
 944		ret = -ENODEV;
 945		goto out;
 946	}
 947	cosa = cosa_cards+n;
 948
 949	if ((n=iminor(file_inode(file))
 950		& ((1<<CARD_MINOR_BITS)-1)) >= cosa->nchannels) {
 951		ret = -ENODEV;
 952		goto out;
 953	}
 954	chan = cosa->chan + n;
 955	
 956	file->private_data = chan;
 957
 958	spin_lock_irqsave(&cosa->lock, flags);
 959
 960	if (chan->usage < 0) { /* in netdev mode */
 961		spin_unlock_irqrestore(&cosa->lock, flags);
 962		ret = -EBUSY;
 963		goto out;
 964	}
 965	cosa->usage++;
 966	chan->usage++;
 967
 968	chan->tx_done = chrdev_tx_done;
 969	chan->setup_rx = chrdev_setup_rx;
 970	chan->rx_done = chrdev_rx_done;
 971	spin_unlock_irqrestore(&cosa->lock, flags);
 972out:
 973	mutex_unlock(&cosa_chardev_mutex);
 974	return ret;
 975}
 976
 977static int cosa_release(struct inode *inode, struct file *file)
 978{
 979	struct channel_data *channel = file->private_data;
 980	struct cosa_data *cosa;
 981	unsigned long flags;
 982
 983	cosa = channel->cosa;
 984	spin_lock_irqsave(&cosa->lock, flags);
 985	cosa->usage--;
 986	channel->usage--;
 987	spin_unlock_irqrestore(&cosa->lock, flags);
 988	return 0;
 989}
 990
 991#ifdef COSA_FASYNC_WORKING
 992static struct fasync_struct *fasync[256] = { NULL, };
 993
 994/* To be done ... */
 995static int cosa_fasync(struct inode *inode, struct file *file, int on)
 996{
 997        int port = iminor(inode);
 998
 999	return fasync_helper(inode, file, on, &fasync[port]);
1000}
1001#endif
1002
1003
1004/* ---------- Ioctls ---------- */
1005
1006/*
1007 * Ioctl subroutines can safely be made inline, because they are called
1008 * only from cosa_ioctl().
1009 */
1010static inline int cosa_reset(struct cosa_data *cosa)
1011{
1012	char idstring[COSA_MAX_ID_STRING];
1013	if (cosa->usage > 1)
1014		pr_info("cosa%d: WARNING: reset requested with cosa->usage > 1 (%d). Odd things may happen.\n",
1015			cosa->num, cosa->usage);
1016	cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_START);
1017	if (cosa_reset_and_read_id(cosa, idstring) < 0) {
1018		pr_notice("cosa%d: reset failed\n", cosa->num);
1019		return -EIO;
1020	}
1021	pr_info("cosa%d: resetting device: %s\n", cosa->num, idstring);
1022	cosa->firmware_status |= COSA_FW_RESET;
1023	return 0;
1024}
1025
1026/* High-level function to download data into COSA memory. Calls download() */
1027static inline int cosa_download(struct cosa_data *cosa, void __user *arg)
1028{
1029	struct cosa_download d;
1030	int i;
1031
1032	if (cosa->usage > 1)
1033		pr_info("%s: WARNING: download of microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n",
1034			cosa->name, cosa->usage);
1035	if (!(cosa->firmware_status & COSA_FW_RESET)) {
1036		pr_notice("%s: reset the card first (status %d)\n",
1037			  cosa->name, cosa->firmware_status);
1038		return -EPERM;
1039	}
1040	
1041	if (copy_from_user(&d, arg, sizeof(d)))
1042		return -EFAULT;
1043
1044	if (d.addr < 0 || d.addr > COSA_MAX_FIRMWARE_SIZE)
1045		return -EINVAL;
1046	if (d.len < 0 || d.len > COSA_MAX_FIRMWARE_SIZE)
1047		return -EINVAL;
1048
1049
1050	/* If something fails, force the user to reset the card */
1051	cosa->firmware_status &= ~(COSA_FW_RESET|COSA_FW_DOWNLOAD);
1052
1053	i = download(cosa, d.code, d.len, d.addr);
1054	if (i < 0) {
1055		pr_notice("cosa%d: microcode download failed: %d\n",
1056			  cosa->num, i);
1057		return -EIO;
1058	}
1059	pr_info("cosa%d: downloading microcode - 0x%04x bytes at 0x%04x\n",
1060		cosa->num, d.len, d.addr);
1061	cosa->firmware_status |= COSA_FW_RESET|COSA_FW_DOWNLOAD;
1062	return 0;
1063}
1064
1065/* High-level function to read COSA memory. Calls readmem() */
1066static inline int cosa_readmem(struct cosa_data *cosa, void __user *arg)
1067{
1068	struct cosa_download d;
1069	int i;
1070
1071	if (cosa->usage > 1)
1072		pr_info("cosa%d: WARNING: readmem requested with cosa->usage > 1 (%d). Odd things may happen.\n",
1073			cosa->num, cosa->usage);
1074	if (!(cosa->firmware_status & COSA_FW_RESET)) {
1075		pr_notice("%s: reset the card first (status %d)\n",
1076			  cosa->name, cosa->firmware_status);
1077		return -EPERM;
1078	}
1079
1080	if (copy_from_user(&d, arg, sizeof(d)))
1081		return -EFAULT;
1082
1083	/* If something fails, force the user to reset the card */
1084	cosa->firmware_status &= ~COSA_FW_RESET;
1085
1086	i = readmem(cosa, d.code, d.len, d.addr);
1087	if (i < 0) {
1088		pr_notice("cosa%d: reading memory failed: %d\n", cosa->num, i);
1089		return -EIO;
1090	}
1091	pr_info("cosa%d: reading card memory - 0x%04x bytes at 0x%04x\n",
1092		cosa->num, d.len, d.addr);
1093	cosa->firmware_status |= COSA_FW_RESET;
1094	return 0;
1095}
1096
1097/* High-level function to start microcode. Calls startmicrocode(). */
1098static inline int cosa_start(struct cosa_data *cosa, int address)
1099{
1100	int i;
1101
1102	if (cosa->usage > 1)
1103		pr_info("cosa%d: WARNING: start microcode requested with cosa->usage > 1 (%d). Odd things may happen.\n",
1104			cosa->num, cosa->usage);
1105
1106	if ((cosa->firmware_status & (COSA_FW_RESET|COSA_FW_DOWNLOAD))
1107		!= (COSA_FW_RESET|COSA_FW_DOWNLOAD)) {
1108		pr_notice("%s: download the microcode and/or reset the card first (status %d)\n",
1109			  cosa->name, cosa->firmware_status);
1110		return -EPERM;
1111	}
1112	cosa->firmware_status &= ~COSA_FW_RESET;
1113	if ((i=startmicrocode(cosa, address)) < 0) {
1114		pr_notice("cosa%d: start microcode at 0x%04x failed: %d\n",
1115			  cosa->num, address, i);
1116		return -EIO;
1117	}
1118	pr_info("cosa%d: starting microcode at 0x%04x\n", cosa->num, address);
1119	cosa->startaddr = address;
1120	cosa->firmware_status |= COSA_FW_START;
1121	return 0;
1122}
1123		
1124/* Buffer of size at least COSA_MAX_ID_STRING is expected */
1125static inline int cosa_getidstr(struct cosa_data *cosa, char __user *string)
1126{
1127	int l = strlen(cosa->id_string)+1;
1128	if (copy_to_user(string, cosa->id_string, l))
1129		return -EFAULT;
1130	return l;
1131}
1132
1133/* Buffer of size at least COSA_MAX_ID_STRING is expected */
1134static inline int cosa_gettype(struct cosa_data *cosa, char __user *string)
1135{
1136	int l = strlen(cosa->type)+1;
1137	if (copy_to_user(string, cosa->type, l))
1138		return -EFAULT;
1139	return l;
1140}
1141
1142static int cosa_ioctl_common(struct cosa_data *cosa,
1143	struct channel_data *channel, unsigned int cmd, unsigned long arg)
1144{
1145	void __user *argp = (void __user *)arg;
1146	switch (cmd) {
1147	case COSAIORSET:	/* Reset the device */
1148		if (!capable(CAP_NET_ADMIN))
1149			return -EACCES;
1150		return cosa_reset(cosa);
1151	case COSAIOSTRT:	/* Start the firmware */
1152		if (!capable(CAP_SYS_RAWIO))
1153			return -EACCES;
1154		return cosa_start(cosa, arg);
1155	case COSAIODOWNLD:	/* Download the firmware */
1156		if (!capable(CAP_SYS_RAWIO))
1157			return -EACCES;
1158		
1159		return cosa_download(cosa, argp);
1160	case COSAIORMEM:
1161		if (!capable(CAP_SYS_RAWIO))
1162			return -EACCES;
1163		return cosa_readmem(cosa, argp);
1164	case COSAIORTYPE:
1165		return cosa_gettype(cosa, argp);
1166	case COSAIORIDSTR:
1167		return cosa_getidstr(cosa, argp);
1168	case COSAIONRCARDS:
1169		return nr_cards;
1170	case COSAIONRCHANS:
1171		return cosa->nchannels;
1172	case COSAIOBMSET:
1173		if (!capable(CAP_SYS_RAWIO))
1174			return -EACCES;
1175		if (is_8bit(cosa))
1176			return -EINVAL;
1177		if (arg != COSA_BM_OFF && arg != COSA_BM_ON)
1178			return -EINVAL;
1179		cosa->busmaster = arg;
1180		return 0;
1181	case COSAIOBMGET:
1182		return cosa->busmaster;
1183	}
1184	return -ENOIOCTLCMD;
1185}
1186
1187static int cosa_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1188{
1189	int rv;
1190	struct channel_data *chan = dev_to_chan(dev);
1191	rv = cosa_ioctl_common(chan->cosa, chan, cmd,
1192			       (unsigned long)ifr->ifr_data);
1193	if (rv != -ENOIOCTLCMD)
1194		return rv;
1195	return hdlc_ioctl(dev, ifr, cmd);
1196}
1197
1198static long cosa_chardev_ioctl(struct file *file, unsigned int cmd,
1199							unsigned long arg)
1200{
1201	struct channel_data *channel = file->private_data;
1202	struct cosa_data *cosa;
1203	long ret;
1204
1205	mutex_lock(&cosa_chardev_mutex);
1206	cosa = channel->cosa;
1207	ret = cosa_ioctl_common(cosa, channel, cmd, arg);
1208	mutex_unlock(&cosa_chardev_mutex);
1209	return ret;
1210}
1211
1212
1213/*---------- HW layer interface ---------- */
1214
1215/*
1216 * The higher layer can bind itself to the HW layer by setting the callbacks
1217 * in the channel_data structure and by using these routines.
1218 */
1219static void cosa_enable_rx(struct channel_data *chan)
1220{
1221	struct cosa_data *cosa = chan->cosa;
1222
1223	if (!test_and_set_bit(chan->num, &cosa->rxbitmap))
1224		put_driver_status(cosa);
1225}
1226
1227static void cosa_disable_rx(struct channel_data *chan)
1228{
1229	struct cosa_data *cosa = chan->cosa;
1230
1231	if (test_and_clear_bit(chan->num, &cosa->rxbitmap))
1232		put_driver_status(cosa);
1233}
1234
1235/*
1236 * FIXME: This routine probably should check for cosa_start_tx() called when
1237 * the previous transmit is still unfinished. In this case the non-zero
1238 * return value should indicate to the caller that the queuing(sp?) up
1239 * the transmit has failed.
1240 */
1241static int cosa_start_tx(struct channel_data *chan, char *buf, int len)
1242{
1243	struct cosa_data *cosa = chan->cosa;
1244	unsigned long flags;
1245#ifdef DEBUG_DATA
1246	int i;
1247
1248	pr_info("cosa%dc%d: starting tx(0x%x)",
1249		chan->cosa->num, chan->num, len);
1250	for (i=0; i<len; i++)
1251		pr_cont(" %02x", buf[i]&0xff);
1252	pr_cont("\n");
1253#endif
1254	spin_lock_irqsave(&cosa->lock, flags);
1255	chan->txbuf = buf;
1256	chan->txsize = len;
1257	if (len > COSA_MTU)
1258		chan->txsize = COSA_MTU;
1259	spin_unlock_irqrestore(&cosa->lock, flags);
1260
1261	/* Tell the firmware we are ready */
1262	set_bit(chan->num, &cosa->txbitmap);
1263	put_driver_status(cosa);
1264
1265	return 0;
1266}
1267
1268static void put_driver_status(struct cosa_data *cosa)
1269{
1270	unsigned long flags;
1271	int status;
1272
1273	spin_lock_irqsave(&cosa->lock, flags);
1274
1275	status = (cosa->rxbitmap ? DRIVER_RX_READY : 0)
1276		| (cosa->txbitmap ? DRIVER_TX_READY : 0)
1277		| (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT)
1278			&DRIVER_TXMAP_MASK : 0);
1279	if (!cosa->rxtx) {
1280		if (cosa->rxbitmap|cosa->txbitmap) {
1281			if (!cosa->enabled) {
1282				cosa_putstatus(cosa, SR_RX_INT_ENA);
1283#ifdef DEBUG_IO
1284				debug_status_out(cosa, SR_RX_INT_ENA);
1285#endif
1286				cosa->enabled = 1;
1287			}
1288		} else if (cosa->enabled) {
1289			cosa->enabled = 0;
1290			cosa_putstatus(cosa, 0);
1291#ifdef DEBUG_IO
1292			debug_status_out(cosa, 0);
1293#endif
1294		}
1295		cosa_putdata8(cosa, status);
1296#ifdef DEBUG_IO
1297		debug_data_cmd(cosa, status);
1298#endif
1299	}
1300	spin_unlock_irqrestore(&cosa->lock, flags);
1301}
1302
1303static void put_driver_status_nolock(struct cosa_data *cosa)
1304{
1305	int status;
1306
1307	status = (cosa->rxbitmap ? DRIVER_RX_READY : 0)
1308		| (cosa->txbitmap ? DRIVER_TX_READY : 0)
1309		| (cosa->txbitmap? ~(cosa->txbitmap<<DRIVER_TXMAP_SHIFT)
1310			&DRIVER_TXMAP_MASK : 0);
1311
1312	if (cosa->rxbitmap|cosa->txbitmap) {
1313		cosa_putstatus(cosa, SR_RX_INT_ENA);
1314#ifdef DEBUG_IO
1315		debug_status_out(cosa, SR_RX_INT_ENA);
1316#endif
1317		cosa->enabled = 1;
1318	} else {
1319		cosa_putstatus(cosa, 0);
1320#ifdef DEBUG_IO
1321		debug_status_out(cosa, 0);
1322#endif
1323		cosa->enabled = 0;
1324	}
1325	cosa_putdata8(cosa, status);
1326#ifdef DEBUG_IO
1327	debug_data_cmd(cosa, status);
1328#endif
1329}
1330
1331/*
1332 * The "kickme" function: When the DMA times out, this is called to
1333 * clean up the driver status.
1334 * FIXME: Preliminary support, the interface is probably wrong.
1335 */
1336static void cosa_kick(struct cosa_data *cosa)
1337{
1338	unsigned long flags, flags1;
1339	char *s = "(probably) IRQ";
1340
1341	if (test_bit(RXBIT, &cosa->rxtx))
1342		s = "RX DMA";
1343	if (test_bit(TXBIT, &cosa->rxtx))
1344		s = "TX DMA";
1345
1346	pr_info("%s: %s timeout - restarting\n", cosa->name, s);
1347	spin_lock_irqsave(&cosa->lock, flags);
1348	cosa->rxtx = 0;
1349
1350	flags1 = claim_dma_lock();
1351	disable_dma(cosa->dma);
1352	clear_dma_ff(cosa->dma);
1353	release_dma_lock(flags1);
1354
1355	/* FIXME: Anything else? */
1356	udelay(100);
1357	cosa_putstatus(cosa, 0);
1358	udelay(100);
1359	(void) cosa_getdata8(cosa);
1360	udelay(100);
1361	cosa_putdata8(cosa, 0);
1362	udelay(100);
1363	put_driver_status_nolock(cosa);
1364	spin_unlock_irqrestore(&cosa->lock, flags);
1365}
1366
1367/*
1368 * Check if the whole buffer is DMA-able. It means it is below the 16M of
1369 * physical memory and doesn't span the 64k boundary. For now it seems
1370 * SKB's never do this, but we'll check this anyway.
1371 */
1372static int cosa_dma_able(struct channel_data *chan, char *buf, int len)
1373{
1374	static int count;
1375	unsigned long b = (unsigned long)buf;
1376	if (b+len >= MAX_DMA_ADDRESS)
1377		return 0;
1378	if ((b^ (b+len)) & 0x10000) {
1379		if (count++ < 5)
1380			pr_info("%s: packet spanning a 64k boundary\n",
1381				chan->name);
1382		return 0;
1383	}
1384	return 1;
1385}
1386
1387
1388/* ---------- The SRP/COSA ROM monitor functions ---------- */
1389
1390/*
1391 * Downloading SRP microcode: say "w" to SRP monitor, it answers by "w=",
1392 * drivers need to say 4-digit hex number meaning start address of the microcode
1393 * separated by a single space. Monitor replies by saying " =". Now driver
1394 * has to write 4-digit hex number meaning the last byte address ended
1395 * by a single space. Monitor has to reply with a space. Now the download
1396 * begins. After the download monitor replies with "\r\n." (CR LF dot).
1397 */
1398static int download(struct cosa_data *cosa, const char __user *microcode, int length, int address)
1399{
1400	int i;
1401
1402	if (put_wait_data(cosa, 'w') == -1) return -1;
1403	if ((i=get_wait_data(cosa)) != 'w') { printk("dnld: 0x%04x\n",i); return -2;}
1404	if (get_wait_data(cosa) != '=') return -3;
1405
1406	if (puthexnumber(cosa, address) < 0) return -4;
1407	if (put_wait_data(cosa, ' ') == -1) return -10;
1408	if (get_wait_data(cosa) != ' ') return -11;
1409	if (get_wait_data(cosa) != '=') return -12;
1410
1411	if (puthexnumber(cosa, address+length-1) < 0) return -13;
1412	if (put_wait_data(cosa, ' ') == -1) return -18;
1413	if (get_wait_data(cosa) != ' ') return -19;
1414
1415	while (length--) {
1416		char c;
1417#ifndef SRP_DOWNLOAD_AT_BOOT
1418		if (get_user(c, microcode))
1419			return -23; /* ??? */
1420#else
1421		c = *microcode;
1422#endif
1423		if (put_wait_data(cosa, c) == -1)
1424			return -20;
1425		microcode++;
1426	}
1427
1428	if (get_wait_data(cosa) != '\r') return -21;
1429	if (get_wait_data(cosa) != '\n') return -22;
1430	if (get_wait_data(cosa) != '.') return -23;
1431#if 0
1432	printk(KERN_DEBUG "cosa%d: download completed.\n", cosa->num);
1433#endif
1434	return 0;
1435}
1436
1437
1438/*
1439 * Starting microcode is done via the "g" command of the SRP monitor.
1440 * The chat should be the following: "g" "g=" "<addr><CR>"
1441 * "<CR><CR><LF><CR><LF>".
1442 */
1443static int startmicrocode(struct cosa_data *cosa, int address)
1444{
1445	if (put_wait_data(cosa, 'g') == -1) return -1;
1446	if (get_wait_data(cosa) != 'g') return -2;
1447	if (get_wait_data(cosa) != '=') return -3;
1448
1449	if (puthexnumber(cosa, address) < 0) return -4;
1450	if (put_wait_data(cosa, '\r') == -1) return -5;
1451	
1452	if (get_wait_data(cosa) != '\r') return -6;
1453	if (get_wait_data(cosa) != '\r') return -7;
1454	if (get_wait_data(cosa) != '\n') return -8;
1455	if (get_wait_data(cosa) != '\r') return -9;
1456	if (get_wait_data(cosa) != '\n') return -10;
1457#if 0
1458	printk(KERN_DEBUG "cosa%d: microcode started\n", cosa->num);
1459#endif
1460	return 0;
1461}
1462
1463/*
1464 * Reading memory is done via the "r" command of the SRP monitor.
1465 * The chat is the following "r" "r=" "<addr> " " =" "<last_byte> " " "
1466 * Then driver can read the data and the conversation is finished
1467 * by SRP monitor sending "<CR><LF>." (dot at the end).
1468 *
1469 * This routine is not needed during the normal operation and serves
1470 * for debugging purposes only.
1471 */
1472static int readmem(struct cosa_data *cosa, char __user *microcode, int length, int address)
1473{
1474	if (put_wait_data(cosa, 'r') == -1) return -1;
1475	if ((get_wait_data(cosa)) != 'r') return -2;
1476	if ((get_wait_data(cosa)) != '=') return -3;
1477
1478	if (puthexnumber(cosa, address) < 0) return -4;
1479	if (put_wait_data(cosa, ' ') == -1) return -5;
1480	if (get_wait_data(cosa) != ' ') return -6;
1481	if (get_wait_data(cosa) != '=') return -7;
1482
1483	if (puthexnumber(cosa, address+length-1) < 0) return -8;
1484	if (put_wait_data(cosa, ' ') == -1) return -9;
1485	if (get_wait_data(cosa) != ' ') return -10;
1486
1487	while (length--) {
1488		char c;
1489		int i;
1490		if ((i=get_wait_data(cosa)) == -1) {
1491			pr_info("0x%04x bytes remaining\n", length);
1492			return -11;
1493		}
1494		c=i;
1495#if 1
1496		if (put_user(c, microcode))
1497			return -23; /* ??? */
1498#else
1499		*microcode = c;
1500#endif
1501		microcode++;
1502	}
1503
1504	if (get_wait_data(cosa) != '\r') return -21;
1505	if (get_wait_data(cosa) != '\n') return -22;
1506	if (get_wait_data(cosa) != '.') return -23;
1507#if 0
1508	printk(KERN_DEBUG "cosa%d: readmem completed.\n", cosa->num);
1509#endif
1510	return 0;
1511}
1512
1513/*
1514 * This function resets the device and reads the initial prompt
1515 * of the device's ROM monitor.
1516 */
1517static int cosa_reset_and_read_id(struct cosa_data *cosa, char *idstring)
1518{
1519	int i=0, id=0, prev=0, curr=0;
1520
1521	/* Reset the card ... */
1522	cosa_putstatus(cosa, 0);
1523	cosa_getdata8(cosa);
1524	cosa_putstatus(cosa, SR_RST);
1525	msleep(500);
1526	/* Disable all IRQs from the card */
1527	cosa_putstatus(cosa, 0);
1528
1529	/*
1530	 * Try to read the ID string. The card then prints out the
1531	 * identification string ended by the "\n\x2e".
1532	 *
1533	 * The following loop is indexed through i (instead of id)
1534	 * to avoid looping forever when for any reason
1535	 * the port returns '\r', '\n' or '\x2e' permanently.
1536	 */
1537	for (i=0; i<COSA_MAX_ID_STRING-1; i++, prev=curr) {
1538		if ((curr = get_wait_data(cosa)) == -1) {
1539			return -1;
1540		}
1541		curr &= 0xff;
1542		if (curr != '\r' && curr != '\n' && curr != 0x2e)
1543			idstring[id++] = curr;
1544		if (curr == 0x2e && prev == '\n')
1545			break;
1546	}
1547	/* Perhaps we should fail when i==COSA_MAX_ID_STRING-1 ? */
1548	idstring[id] = '\0';
1549	return id;
1550}
1551
1552
1553/* ---------- Auxiliary routines for COSA/SRP monitor ---------- */
1554
1555/*
1556 * This routine gets the data byte from the card waiting for the SR_RX_RDY
1557 * bit to be set in a loop. It should be used in the exceptional cases
1558 * only (for example when resetting the card or downloading the firmware.
1559 */
1560static int get_wait_data(struct cosa_data *cosa)
1561{
1562	int retries = 1000;
1563
1564	while (--retries) {
1565		/* read data and return them */
1566		if (cosa_getstatus(cosa) & SR_RX_RDY) {
1567			short r;
1568			r = cosa_getdata8(cosa);
1569#if 0
1570			pr_info("get_wait_data returning after %d retries\n",
1571				999-retries);
1572#endif
1573			return r;
1574		}
1575		/* sleep if not ready to read */
1576		schedule_timeout_interruptible(1);
1577	}
1578	pr_info("timeout in get_wait_data (status 0x%x)\n",
1579		cosa_getstatus(cosa));
1580	return -1;
1581}
1582
1583/*
1584 * This routine puts the data byte to the card waiting for the SR_TX_RDY
1585 * bit to be set in a loop. It should be used in the exceptional cases
1586 * only (for example when resetting the card or downloading the firmware).
1587 */
1588static int put_wait_data(struct cosa_data *cosa, int data)
1589{
1590	int retries = 1000;
1591	while (--retries) {
1592		/* read data and return them */
1593		if (cosa_getstatus(cosa) & SR_TX_RDY) {
1594			cosa_putdata8(cosa, data);
1595#if 0
1596			pr_info("Putdata: %d retries\n", 999-retries);
1597#endif
1598			return 0;
1599		}
1600#if 0
1601		/* sleep if not ready to read */
1602		schedule_timeout_interruptible(1);
1603#endif
1604	}
1605	pr_info("cosa%d: timeout in put_wait_data (status 0x%x)\n",
1606		cosa->num, cosa_getstatus(cosa));
1607	return -1;
1608}
1609	
1610/* 
1611 * The following routine puts the hexadecimal number into the SRP monitor
1612 * and verifies the proper echo of the sent bytes. Returns 0 on success,
1613 * negative number on failure (-1,-3,-5,-7) means that put_wait_data() failed,
1614 * (-2,-4,-6,-8) means that reading echo failed.
1615 */
1616static int puthexnumber(struct cosa_data *cosa, int number)
1617{
1618	char temp[5];
1619	int i;
1620
1621	/* Well, I should probably replace this by something faster. */
1622	sprintf(temp, "%04X", number);
1623	for (i=0; i<4; i++) {
1624		if (put_wait_data(cosa, temp[i]) == -1) {
1625			pr_notice("cosa%d: puthexnumber failed to write byte %d\n",
1626				  cosa->num, i);
1627			return -1-2*i;
1628		}
1629		if (get_wait_data(cosa) != temp[i]) {
1630			pr_notice("cosa%d: puthexhumber failed to read echo of byte %d\n",
1631				  cosa->num, i);
1632			return -2-2*i;
1633		}
1634	}
1635	return 0;
1636}
1637
1638
1639/* ---------- Interrupt routines ---------- */
1640
1641/*
1642 * There are three types of interrupt:
1643 * At the beginning of transmit - this handled is in tx_interrupt(),
1644 * at the beginning of receive - it is in rx_interrupt() and
1645 * at the end of transmit/receive - it is the eot_interrupt() function.
1646 * These functions are multiplexed by cosa_interrupt() according to the
1647 * COSA status byte. I have moved the rx/tx/eot interrupt handling into
1648 * separate functions to make it more readable. These functions are inline,
1649 * so there should be no overhead of function call.
1650 * 
1651 * In the COSA bus-master mode, we need to tell the card the address of a
1652 * buffer. Unfortunately, COSA may be too slow for us, so we must busy-wait.
1653 * It's time to use the bottom half :-(
1654 */
1655
1656/*
1657 * Transmit interrupt routine - called when COSA is willing to obtain
1658 * data from the OS. The most tricky part of the routine is selection
1659 * of channel we (OS) want to send packet for. For SRP we should probably
1660 * use the round-robin approach. The newer COSA firmwares have a simple
1661 * flow-control - in the status word has bits 2 and 3 set to 1 means that the
1662 * channel 0 or 1 doesn't want to receive data.
1663 *
1664 * It seems there is a bug in COSA firmware (need to trace it further):
1665 * When the driver status says that the kernel has no more data for transmit
1666 * (e.g. at the end of TX DMA) and then the kernel changes its mind
1667 * (e.g. new packet is queued to hard_start_xmit()), the card issues
1668 * the TX interrupt but does not mark the channel as ready-to-transmit.
1669 * The fix seems to be to push the packet to COSA despite its request.
1670 * We first try to obey the card's opinion, and then fall back to forced TX.
1671 */
1672static inline void tx_interrupt(struct cosa_data *cosa, int status)
1673{
1674	unsigned long flags, flags1;
1675#ifdef DEBUG_IRQS
1676	pr_info("cosa%d: SR_DOWN_REQUEST status=0x%04x\n", cosa->num, status);
1677#endif
1678	spin_lock_irqsave(&cosa->lock, flags);
1679	set_bit(TXBIT, &cosa->rxtx);
1680	if (!test_bit(IRQBIT, &cosa->rxtx)) {
1681		/* flow control, see the comment above */
1682		int i=0;
1683		if (!cosa->txbitmap) {
1684			pr_warn("%s: No channel wants data in TX IRQ. Expect DMA timeout.\n",
1685				cosa->name);
1686			put_driver_status_nolock(cosa);
1687			clear_bit(TXBIT, &cosa->rxtx);
1688			spin_unlock_irqrestore(&cosa->lock, flags);
1689			return;
1690		}
1691		while (1) {
1692			cosa->txchan++;
1693			i++;
1694			if (cosa->txchan >= cosa->nchannels)
1695				cosa->txchan = 0;
1696			if (!(cosa->txbitmap & (1<<cosa->txchan)))
1697				continue;
1698			if (~status & (1 << (cosa->txchan+DRIVER_TXMAP_SHIFT)))
1699				break;
1700			/* in second pass, accept first ready-to-TX channel */
1701			if (i > cosa->nchannels) {
1702				/* Can be safely ignored */
1703#ifdef DEBUG_IRQS
1704				printk(KERN_DEBUG "%s: Forcing TX "
1705					"to not-ready channel %d\n",
1706					cosa->name, cosa->txchan);
1707#endif
1708				break;
1709			}
1710		}
1711
1712		cosa->txsize = cosa->chan[cosa->txchan].txsize;
1713		if (cosa_dma_able(cosa->chan+cosa->txchan,
1714			cosa->chan[cosa->txchan].txbuf, cosa->txsize)) {
1715			cosa->txbuf = cosa->chan[cosa->txchan].txbuf;
1716		} else {
1717			memcpy(cosa->bouncebuf, cosa->chan[cosa->txchan].txbuf,
1718				cosa->txsize);
1719			cosa->txbuf = cosa->bouncebuf;
1720		}
1721	}
1722
1723	if (is_8bit(cosa)) {
1724		if (!test_bit(IRQBIT, &cosa->rxtx)) {
1725			cosa_putstatus(cosa, SR_TX_INT_ENA);
1726			cosa_putdata8(cosa, ((cosa->txchan << 5) & 0xe0)|
1727				((cosa->txsize >> 8) & 0x1f));
1728#ifdef DEBUG_IO
1729			debug_status_out(cosa, SR_TX_INT_ENA);
1730			debug_data_out(cosa, ((cosa->txchan << 5) & 0xe0)|
1731                                ((cosa->txsize >> 8) & 0x1f));
1732			debug_data_in(cosa, cosa_getdata8(cosa));
1733#else
1734			cosa_getdata8(cosa);
1735#endif
1736			set_bit(IRQBIT, &cosa->rxtx);
1737			spin_unlock_irqrestore(&cosa->lock, flags);
1738			return;
1739		} else {
1740			clear_bit(IRQBIT, &cosa->rxtx);
1741			cosa_putstatus(cosa, 0);
1742			cosa_putdata8(cosa, cosa->txsize&0xff);
1743#ifdef DEBUG_IO
1744			debug_status_out(cosa, 0);
1745			debug_data_out(cosa, cosa->txsize&0xff);
1746#endif
1747		}
1748	} else {
1749		cosa_putstatus(cosa, SR_TX_INT_ENA);
1750		cosa_putdata16(cosa, ((cosa->txchan<<13) & 0xe000)
1751			| (cosa->txsize & 0x1fff));
1752#ifdef DEBUG_IO
1753		debug_status_out(cosa, SR_TX_INT_ENA);
1754		debug_data_out(cosa, ((cosa->txchan<<13) & 0xe000)
1755                        | (cosa->txsize & 0x1fff));
1756		debug_data_in(cosa, cosa_getdata8(cosa));
1757		debug_status_out(cosa, 0);
1758#else
1759		cosa_getdata8(cosa);
1760#endif
1761		cosa_putstatus(cosa, 0);
1762	}
1763
1764	if (cosa->busmaster) {
1765		unsigned long addr = virt_to_bus(cosa->txbuf);
1766		int count=0;
1767		pr_info("busmaster IRQ\n");
1768		while (!(cosa_getstatus(cosa)&SR_TX_RDY)) {
1769			count++;
1770			udelay(10);
1771			if (count > 1000) break;
1772		}
1773		pr_info("status %x\n", cosa_getstatus(cosa));
1774		pr_info("ready after %d loops\n", count);
1775		cosa_putdata16(cosa, (addr >> 16)&0xffff);
1776
1777		count = 0;
1778		while (!(cosa_getstatus(cosa)&SR_TX_RDY)) {
1779			count++;
1780			if (count > 1000) break;
1781			udelay(10);
1782		}
1783		pr_info("ready after %d loops\n", count);
1784		cosa_putdata16(cosa, addr &0xffff);
1785		flags1 = claim_dma_lock();
1786		set_dma_mode(cosa->dma, DMA_MODE_CASCADE);
1787		enable_dma(cosa->dma);
1788		release_dma_lock(flags1);
1789	} else {
1790		/* start the DMA */
1791		flags1 = claim_dma_lock();
1792		disable_dma(cosa->dma);
1793		clear_dma_ff(cosa->dma);
1794		set_dma_mode(cosa->dma, DMA_MODE_WRITE);
1795		set_dma_addr(cosa->dma, virt_to_bus(cosa->txbuf));
1796		set_dma_count(cosa->dma, cosa->txsize);
1797		enable_dma(cosa->dma);
1798		release_dma_lock(flags1);
1799	}
1800	cosa_putstatus(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA);
1801#ifdef DEBUG_IO
1802	debug_status_out(cosa, SR_TX_DMA_ENA|SR_USR_INT_ENA);
1803#endif
1804	spin_unlock_irqrestore(&cosa->lock, flags);
1805}
1806
1807static inline void rx_interrupt(struct cosa_data *cosa, int status)
1808{
1809	unsigned long flags;
1810#ifdef DEBUG_IRQS
1811	pr_info("cosa%d: SR_UP_REQUEST\n", cosa->num);
1812#endif
1813
1814	spin_lock_irqsave(&cosa->lock, flags);
1815	set_bit(RXBIT, &cosa->rxtx);
1816
1817	if (is_8bit(cosa)) {
1818		if (!test_bit(IRQBIT, &cosa->rxtx)) {
1819			set_bit(IRQBIT, &cosa->rxtx);
1820			put_driver_status_nolock(cosa);
1821			cosa->rxsize = cosa_getdata8(cosa) <<8;
1822#ifdef DEBUG_IO
1823			debug_data_in(cosa, cosa->rxsize >> 8);
1824#endif
1825			spin_unlock_irqrestore(&cosa->lock, flags);
1826			return;
1827		} else {
1828			clear_bit(IRQBIT, &cosa->rxtx);
1829			cosa->rxsize |= cosa_getdata8(cosa) & 0xff;
1830#ifdef DEBUG_IO
1831			debug_data_in(cosa, cosa->rxsize & 0xff);
1832#endif
1833#if 0
1834			pr_info("cosa%d: receive rxsize = (0x%04x)\n",
1835				cosa->num, cosa->rxsize);
1836#endif
1837		}
1838	} else {
1839		cosa->rxsize = cosa_getdata16(cosa);
1840#ifdef DEBUG_IO
1841		debug_data_in(cosa, cosa->rxsize);
1842#endif
1843#if 0
1844		pr_info("cosa%d: receive rxsize = (0x%04x)\n",
1845			cosa->num, cosa->rxsize);
1846#endif
1847	}
1848	if (((cosa->rxsize & 0xe000) >> 13) >= cosa->nchannels) {
1849		pr_warn("%s: rx for unknown channel (0x%04x)\n",
1850			cosa->name, cosa->rxsize);
1851		spin_unlock_irqrestore(&cosa->lock, flags);
1852		goto reject;
1853	}
1854	cosa->rxchan = cosa->chan + ((cosa->rxsize & 0xe000) >> 13);
1855	cosa->rxsize &= 0x1fff;
1856	spin_unlock_irqrestore(&cosa->lock, flags);
1857
1858	cosa->rxbuf = NULL;
1859	if (cosa->rxchan->setup_rx)
1860		cosa->rxbuf = cosa->rxchan->setup_rx(cosa->rxchan, cosa->rxsize);
1861
1862	if (!cosa->rxbuf) {
1863reject:		/* Reject the packet */
1864		pr_info("cosa%d: rejecting packet on channel %d\n",
1865			cosa->num, cosa->rxchan->num);
1866		cosa->rxbuf = cosa->bouncebuf;
1867	}
1868
1869	/* start the DMA */
1870	flags = claim_dma_lock();
1871	disable_dma(cosa->dma);
1872	clear_dma_ff(cosa->dma);
1873	set_dma_mode(cosa->dma, DMA_MODE_READ);
1874	if (cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize & 0x1fff)) {
1875		set_dma_addr(cosa->dma, virt_to_bus(cosa->rxbuf));
1876	} else {
1877		set_dma_addr(cosa->dma, virt_to_bus(cosa->bouncebuf));
1878	}
1879	set_dma_count(cosa->dma, (cosa->rxsize&0x1fff));
1880	enable_dma(cosa->dma);
1881	release_dma_lock(flags);
1882	spin_lock_irqsave(&cosa->lock, flags);
1883	cosa_putstatus(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA);
1884	if (!is_8bit(cosa) && (status & SR_TX_RDY))
1885		cosa_putdata8(cosa, DRIVER_RX_READY);
1886#ifdef DEBUG_IO
1887	debug_status_out(cosa, SR_RX_DMA_ENA|SR_USR_INT_ENA);
1888	if (!is_8bit(cosa) && (status & SR_TX_RDY))
1889		debug_data_cmd(cosa, DRIVER_RX_READY);
1890#endif
1891	spin_unlock_irqrestore(&cosa->lock, flags);
1892}
1893
1894static inline void eot_interrupt(struct cosa_data *cosa, int status)
1895{
1896	unsigned long flags, flags1;
1897	spin_lock_irqsave(&cosa->lock, flags);
1898	flags1 = claim_dma_lock();
1899	disable_dma(cosa->dma);
1900	clear_dma_ff(cosa->dma);
1901	release_dma_lock(flags1);
1902	if (test_bit(TXBIT, &cosa->rxtx)) {
1903		struct channel_data *chan = cosa->chan+cosa->txchan;
1904		if (chan->tx_done)
1905			if (chan->tx_done(chan, cosa->txsize))
1906				clear_bit(chan->num, &cosa->txbitmap);
1907	} else if (test_bit(RXBIT, &cosa->rxtx)) {
1908#ifdef DEBUG_DATA
1909	{
1910		int i;
1911		pr_info("cosa%dc%d: done rx(0x%x)",
1912			cosa->num, cosa->rxchan->num, cosa->rxsize);
1913		for (i=0; i<cosa->rxsize; i++)
1914			pr_cont(" %02x", cosa->rxbuf[i]&0xff);
1915		pr_cont("\n");
1916	}
1917#endif
1918		/* Packet for unknown channel? */
1919		if (cosa->rxbuf == cosa->bouncebuf)
1920			goto out;
1921		if (!cosa_dma_able(cosa->rxchan, cosa->rxbuf, cosa->rxsize))
1922			memcpy(cosa->rxbuf, cosa->bouncebuf, cosa->rxsize);
1923		if (cosa->rxchan->rx_done)
1924			if (cosa->rxchan->rx_done(cosa->rxchan))
1925				clear_bit(cosa->rxchan->num, &cosa->rxbitmap);
1926	} else {
1927		pr_notice("cosa%d: unexpected EOT interrupt\n", cosa->num);
1928	}
1929	/*
1930	 * Clear the RXBIT, TXBIT and IRQBIT (the latest should be
1931	 * cleared anyway). We should do it as soon as possible
1932	 * so that we can tell the COSA we are done and to give it a time
1933	 * for recovery.
1934	 */
1935out:
1936	cosa->rxtx = 0;
1937	put_driver_status_nolock(cosa);
1938	spin_unlock_irqrestore(&cosa->lock, flags);
1939}
1940
1941static irqreturn_t cosa_interrupt(int irq, void *cosa_)
1942{
1943	unsigned status;
1944	int count = 0;
1945	struct cosa_data *cosa = cosa_;
1946again:
1947	status = cosa_getstatus(cosa);
1948#ifdef DEBUG_IRQS
1949	pr_info("cosa%d: got IRQ, status 0x%02x\n", cosa->num, status & 0xff);
1950#endif
1951#ifdef DEBUG_IO
1952	debug_status_in(cosa, status);
1953#endif
1954	switch (status & SR_CMD_FROM_SRP_MASK) {
1955	case SR_DOWN_REQUEST:
1956		tx_interrupt(cosa, status);
1957		break;
1958	case SR_UP_REQUEST:
1959		rx_interrupt(cosa, status);
1960		break;
1961	case SR_END_OF_TRANSFER:
1962		eot_interrupt(cosa, status);
1963		break;
1964	default:
1965		/* We may be too fast for SRP. Try to wait a bit more. */
1966		if (count++ < 100) {
1967			udelay(100);
1968			goto again;
1969		}
1970		pr_info("cosa%d: unknown status 0x%02x in IRQ after %d retries\n",
1971			cosa->num, status & 0xff, count);
1972	}
1973#ifdef DEBUG_IRQS
1974	if (count)
1975		pr_info("%s: %d-times got unknown status in IRQ\n",
1976			cosa->name, count);
1977	else
1978		pr_info("%s: returning from IRQ\n", cosa->name);
1979#endif
1980	return IRQ_HANDLED;
1981}
1982
1983
1984/* ---------- I/O debugging routines ---------- */
1985/*
1986 * These routines can be used to monitor COSA/SRP I/O and to printk()
1987 * the data being transferred on the data and status I/O port in a
1988 * readable way.
1989 */
1990
1991#ifdef DEBUG_IO
1992static void debug_status_in(struct cosa_data *cosa, int status)
1993{
1994	char *s;
1995	switch (status & SR_CMD_FROM_SRP_MASK) {
1996	case SR_UP_REQUEST:
1997		s = "RX_REQ";
1998		break;
1999	case SR_DOWN_REQUEST:
2000		s = "TX_REQ";
2001		break;
2002	case SR_END_OF_TRANSFER:
2003		s = "ET_REQ";
2004		break;
2005	default:
2006		s = "NO_REQ";
2007		break;
2008	}
2009	pr_info("%s: IO: status -> 0x%02x (%s%s%s%s)\n",
2010		cosa->name,
2011		status,
2012		status & SR_USR_RQ ? "USR_RQ|" : "",
2013		status & SR_TX_RDY ? "TX_RDY|" : "",
2014		status & SR_RX_RDY ? "RX_RDY|" : "",
2015		s);
2016}
2017
2018static void debug_status_out(struct cosa_data *cosa, int status)
2019{
2020	pr_info("%s: IO: status <- 0x%02x (%s%s%s%s%s%s)\n",
2021		cosa->name,
2022		status,
2023		status & SR_RX_DMA_ENA  ? "RXDMA|"  : "!rxdma|",
2024		status & SR_TX_DMA_ENA  ? "TXDMA|"  : "!txdma|",
2025		status & SR_RST         ? "RESET|"  : "",
2026		status & SR_USR_INT_ENA ? "USRINT|" : "!usrint|",
2027		status & SR_TX_INT_ENA  ? "TXINT|"  : "!txint|",
2028		status & SR_RX_INT_ENA  ? "RXINT"   : "!rxint");
2029}
2030
2031static void debug_data_in(struct cosa_data *cosa, int data)
2032{
2033	pr_info("%s: IO: data -> 0x%04x\n", cosa->name, data);
2034}
2035
2036static void debug_data_out(struct cosa_data *cosa, int data)
2037{
2038	pr_info("%s: IO: data <- 0x%04x\n", cosa->name, data);
2039}
2040
2041static void debug_data_cmd(struct cosa_data *cosa, int data)
2042{
2043	pr_info("%s: IO: data <- 0x%04x (%s|%s)\n",
2044		cosa->name, data,
2045		data & SR_RDY_RCV ? "RX_RDY" : "!rx_rdy",
2046		data & SR_RDY_SND ? "TX_RDY" : "!tx_rdy");
2047}
2048#endif
2049
2050/* EOF -- this file has not been truncated */