linux/drivers/net/wan/cosa.c
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   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 unsigned int cosa_poll(struct file *file, poll_table *poll)
 928{
 929        pr_info("cosa_poll is here\n");
 930        return 0;
 931}
 932
 933static int cosa_open(struct inode *inode, struct file *file)
 934{
 935        struct cosa_data *cosa;
 936        struct channel_data *chan;
 937        unsigned long flags;
 938        int n;
 939        int ret = 0;
 940
 941        mutex_lock(&cosa_chardev_mutex);
 942        if ((n=iminor(file_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 */
2051