linux/drivers/net/irda/vlsi_ir.c
<<
>>
Prefs
   1/*********************************************************************
   2 *
   3 *      vlsi_ir.c:      VLSI82C147 PCI IrDA controller driver for Linux
   4 *
   5 *      Copyright (c) 2001-2003 Martin Diehl
   6 *
   7 *      This program is free software; you can redistribute it and/or 
   8 *      modify it under the terms of the GNU General Public License as 
   9 *      published by the Free Software Foundation; either version 2 of 
  10 *      the License, or (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., 59 Temple Place, Suite 330, Boston, 
  20 *      MA 02111-1307 USA
  21 *
  22 ********************************************************************/
  23
  24#include <linux/module.h>
  25 
  26#define DRIVER_NAME             "vlsi_ir"
  27#define DRIVER_VERSION          "v0.5"
  28#define DRIVER_DESCRIPTION      "IrDA SIR/MIR/FIR driver for VLSI 82C147"
  29#define DRIVER_AUTHOR           "Martin Diehl <info@mdiehl.de>"
  30
  31MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
  32MODULE_AUTHOR(DRIVER_AUTHOR);
  33MODULE_LICENSE("GPL");
  34
  35/********************************************************/
  36
  37#include <linux/kernel.h>
  38#include <linux/init.h>
  39#include <linux/interrupt.h>
  40#include <linux/pci.h>
  41#include <linux/slab.h>
  42#include <linux/netdevice.h>
  43#include <linux/skbuff.h>
  44#include <linux/delay.h>
  45#include <linux/time.h>
  46#include <linux/proc_fs.h>
  47#include <linux/seq_file.h>
  48#include <linux/mutex.h>
  49#include <asm/uaccess.h>
  50#include <asm/byteorder.h>
  51
  52#include <net/irda/irda.h>
  53#include <net/irda/irda_device.h>
  54#include <net/irda/wrapper.h>
  55#include <net/irda/crc.h>
  56
  57#include "vlsi_ir.h"
  58
  59/********************************************************/
  60
  61static /* const */ char drivername[] = DRIVER_NAME;
  62
  63static DEFINE_PCI_DEVICE_TABLE(vlsi_irda_table) = {
  64        {
  65                .class =        PCI_CLASS_WIRELESS_IRDA << 8,
  66                .class_mask =   PCI_CLASS_SUBCLASS_MASK << 8, 
  67                .vendor =       PCI_VENDOR_ID_VLSI,
  68                .device =       PCI_DEVICE_ID_VLSI_82C147,
  69                .subvendor =    PCI_ANY_ID,
  70                .subdevice =    PCI_ANY_ID,
  71        },
  72        { /* all zeroes */ }
  73};
  74
  75MODULE_DEVICE_TABLE(pci, vlsi_irda_table);
  76
  77/********************************************************/
  78
  79/*      clksrc: which clock source to be used
  80 *              0: auto - try PLL, fallback to 40MHz XCLK
  81 *              1: on-chip 48MHz PLL
  82 *              2: external 48MHz XCLK
  83 *              3: external 40MHz XCLK (HP OB-800)
  84 */
  85
  86static int clksrc = 0;                  /* default is 0(auto) */
  87module_param(clksrc, int, 0);
  88MODULE_PARM_DESC(clksrc, "clock input source selection");
  89
  90/*      ringsize: size of the tx and rx descriptor rings
  91 *              independent for tx and rx
  92 *              specify as ringsize=tx[,rx]
  93 *              allowed values: 4, 8, 16, 32, 64
  94 *              Due to the IrDA 1.x max. allowed window size=7,
  95 *              there should be no gain when using rings larger than 8
  96 */
  97
  98static int ringsize[] = {8,8};          /* default is tx=8 / rx=8 */
  99module_param_array(ringsize, int, NULL, 0);
 100MODULE_PARM_DESC(ringsize, "TX, RX ring descriptor size");
 101
 102/*      sirpulse: tuning of the SIR pulse width within IrPHY 1.3 limits
 103 *              0: very short, 1.5us (exception: 6us at 2.4 kbaud)
 104 *              1: nominal 3/16 bittime width
 105 *      note: IrDA compliant peer devices should be happy regardless
 106 *              which one is used. Primary goal is to save some power
 107 *              on the sender's side - at 9.6kbaud for example the short
 108 *              pulse width saves more than 90% of the transmitted IR power.
 109 */
 110
 111static int sirpulse = 1;                /* default is 3/16 bittime */
 112module_param(sirpulse, int, 0);
 113MODULE_PARM_DESC(sirpulse, "SIR pulse width tuning");
 114
 115/*      qos_mtt_bits: encoded min-turn-time value we require the peer device
 116 *               to use before transmitting to us. "Type 1" (per-station)
 117 *               bitfield according to IrLAP definition (section 6.6.8)
 118 *               Don't know which transceiver is used by my OB800 - the
 119 *               pretty common HP HDLS-1100 requires 1 msec - so lets use this.
 120 */
 121
 122static int qos_mtt_bits = 0x07;         /* default is 1 ms or more */
 123module_param(qos_mtt_bits, int, 0);
 124MODULE_PARM_DESC(qos_mtt_bits, "IrLAP bitfield representing min-turn-time");
 125
 126/********************************************************/
 127
 128static void vlsi_reg_debug(unsigned iobase, const char *s)
 129{
 130        int     i;
 131
 132        printk(KERN_DEBUG "%s: ", s);
 133        for (i = 0; i < 0x20; i++)
 134                printk("%02x", (unsigned)inb((iobase+i)));
 135        printk("\n");
 136}
 137
 138static void vlsi_ring_debug(struct vlsi_ring *r)
 139{
 140        struct ring_descr *rd;
 141        unsigned i;
 142
 143        printk(KERN_DEBUG "%s - ring %p / size %u / mask 0x%04x / len %u / dir %d / hw %p\n",
 144                __func__, r, r->size, r->mask, r->len, r->dir, r->rd[0].hw);
 145        printk(KERN_DEBUG "%s - head = %d / tail = %d\n", __func__,
 146                atomic_read(&r->head) & r->mask, atomic_read(&r->tail) & r->mask);
 147        for (i = 0; i < r->size; i++) {
 148                rd = &r->rd[i];
 149                printk(KERN_DEBUG "%s - ring descr %u: ", __func__, i);
 150                printk("skb=%p data=%p hw=%p\n", rd->skb, rd->buf, rd->hw);
 151                printk(KERN_DEBUG "%s - hw: status=%02x count=%u addr=0x%08x\n",
 152                        __func__, (unsigned) rd_get_status(rd),
 153                        (unsigned) rd_get_count(rd), (unsigned) rd_get_addr(rd));
 154        }
 155}
 156
 157/********************************************************/
 158
 159/* needed regardless of CONFIG_PROC_FS */
 160static struct proc_dir_entry *vlsi_proc_root = NULL;
 161
 162#ifdef CONFIG_PROC_FS
 163
 164static void vlsi_proc_pdev(struct seq_file *seq, struct pci_dev *pdev)
 165{
 166        unsigned iobase = pci_resource_start(pdev, 0);
 167        unsigned i;
 168
 169        seq_printf(seq, "\n%s (vid/did: [%04x:%04x])\n",
 170                   pci_name(pdev), (int)pdev->vendor, (int)pdev->device);
 171        seq_printf(seq, "pci-power-state: %u\n", (unsigned) pdev->current_state);
 172        seq_printf(seq, "resources: irq=%u / io=0x%04x / dma_mask=0x%016Lx\n",
 173                   pdev->irq, (unsigned)pci_resource_start(pdev, 0), (unsigned long long)pdev->dma_mask);
 174        seq_printf(seq, "hw registers: ");
 175        for (i = 0; i < 0x20; i++)
 176                seq_printf(seq, "%02x", (unsigned)inb((iobase+i)));
 177        seq_printf(seq, "\n");
 178}
 179                
 180static void vlsi_proc_ndev(struct seq_file *seq, struct net_device *ndev)
 181{
 182        vlsi_irda_dev_t *idev = netdev_priv(ndev);
 183        u8 byte;
 184        u16 word;
 185        unsigned delta1, delta2;
 186        struct timeval now;
 187        unsigned iobase = ndev->base_addr;
 188
 189        seq_printf(seq, "\n%s link state: %s / %s / %s / %s\n", ndev->name,
 190                netif_device_present(ndev) ? "attached" : "detached", 
 191                netif_running(ndev) ? "running" : "not running",
 192                netif_carrier_ok(ndev) ? "carrier ok" : "no carrier",
 193                netif_queue_stopped(ndev) ? "queue stopped" : "queue running");
 194
 195        if (!netif_running(ndev))
 196                return;
 197
 198        seq_printf(seq, "\nhw-state:\n");
 199        pci_read_config_byte(idev->pdev, VLSI_PCI_IRMISC, &byte);
 200        seq_printf(seq, "IRMISC:%s%s%s uart%s",
 201                (byte&IRMISC_IRRAIL) ? " irrail" : "",
 202                (byte&IRMISC_IRPD) ? " irpd" : "",
 203                (byte&IRMISC_UARTTST) ? " uarttest" : "",
 204                (byte&IRMISC_UARTEN) ? "@" : " disabled\n");
 205        if (byte&IRMISC_UARTEN) {
 206                seq_printf(seq, "0x%s\n",
 207                        (byte&2) ? ((byte&1) ? "3e8" : "2e8")
 208                                 : ((byte&1) ? "3f8" : "2f8"));
 209        }
 210        pci_read_config_byte(idev->pdev, VLSI_PCI_CLKCTL, &byte);
 211        seq_printf(seq, "CLKCTL: PLL %s%s%s / clock %s / wakeup %s\n",
 212                (byte&CLKCTL_PD_INV) ? "powered" : "down",
 213                (byte&CLKCTL_LOCK) ? " locked" : "",
 214                (byte&CLKCTL_EXTCLK) ? ((byte&CLKCTL_XCKSEL)?" / 40 MHz XCLK":" / 48 MHz XCLK") : "",
 215                (byte&CLKCTL_CLKSTP) ? "stopped" : "running",
 216                (byte&CLKCTL_WAKE) ? "enabled" : "disabled");
 217        pci_read_config_byte(idev->pdev, VLSI_PCI_MSTRPAGE, &byte);
 218        seq_printf(seq, "MSTRPAGE: 0x%02x\n", (unsigned)byte);
 219
 220        byte = inb(iobase+VLSI_PIO_IRINTR);
 221        seq_printf(seq, "IRINTR:%s%s%s%s%s%s%s%s\n",
 222                (byte&IRINTR_ACTEN) ? " ACTEN" : "",
 223                (byte&IRINTR_RPKTEN) ? " RPKTEN" : "",
 224                (byte&IRINTR_TPKTEN) ? " TPKTEN" : "",
 225                (byte&IRINTR_OE_EN) ? " OE_EN" : "",
 226                (byte&IRINTR_ACTIVITY) ? " ACTIVITY" : "",
 227                (byte&IRINTR_RPKTINT) ? " RPKTINT" : "",
 228                (byte&IRINTR_TPKTINT) ? " TPKTINT" : "",
 229                (byte&IRINTR_OE_INT) ? " OE_INT" : "");
 230        word = inw(iobase+VLSI_PIO_RINGPTR);
 231        seq_printf(seq, "RINGPTR: rx=%u / tx=%u\n", RINGPTR_GET_RX(word), RINGPTR_GET_TX(word));
 232        word = inw(iobase+VLSI_PIO_RINGBASE);
 233        seq_printf(seq, "RINGBASE: busmap=0x%08x\n",
 234                ((unsigned)word << 10)|(MSTRPAGE_VALUE<<24));
 235        word = inw(iobase+VLSI_PIO_RINGSIZE);
 236        seq_printf(seq, "RINGSIZE: rx=%u / tx=%u\n", RINGSIZE_TO_RXSIZE(word),
 237                RINGSIZE_TO_TXSIZE(word));
 238
 239        word = inw(iobase+VLSI_PIO_IRCFG);
 240        seq_printf(seq, "IRCFG:%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
 241                (word&IRCFG_LOOP) ? " LOOP" : "",
 242                (word&IRCFG_ENTX) ? " ENTX" : "",
 243                (word&IRCFG_ENRX) ? " ENRX" : "",
 244                (word&IRCFG_MSTR) ? " MSTR" : "",
 245                (word&IRCFG_RXANY) ? " RXANY" : "",
 246                (word&IRCFG_CRC16) ? " CRC16" : "",
 247                (word&IRCFG_FIR) ? " FIR" : "",
 248                (word&IRCFG_MIR) ? " MIR" : "",
 249                (word&IRCFG_SIR) ? " SIR" : "",
 250                (word&IRCFG_SIRFILT) ? " SIRFILT" : "",
 251                (word&IRCFG_SIRTEST) ? " SIRTEST" : "",
 252                (word&IRCFG_TXPOL) ? " TXPOL" : "",
 253                (word&IRCFG_RXPOL) ? " RXPOL" : "");
 254        word = inw(iobase+VLSI_PIO_IRENABLE);
 255        seq_printf(seq, "IRENABLE:%s%s%s%s%s%s%s%s\n",
 256                (word&IRENABLE_PHYANDCLOCK) ? " PHYANDCLOCK" : "",
 257                (word&IRENABLE_CFGER) ? " CFGERR" : "",
 258                (word&IRENABLE_FIR_ON) ? " FIR_ON" : "",
 259                (word&IRENABLE_MIR_ON) ? " MIR_ON" : "",
 260                (word&IRENABLE_SIR_ON) ? " SIR_ON" : "",
 261                (word&IRENABLE_ENTXST) ? " ENTXST" : "",
 262                (word&IRENABLE_ENRXST) ? " ENRXST" : "",
 263                (word&IRENABLE_CRC16_ON) ? " CRC16_ON" : "");
 264        word = inw(iobase+VLSI_PIO_PHYCTL);
 265        seq_printf(seq, "PHYCTL: baud-divisor=%u / pulsewidth=%u / preamble=%u\n",
 266                (unsigned)PHYCTL_TO_BAUD(word),
 267                (unsigned)PHYCTL_TO_PLSWID(word),
 268                (unsigned)PHYCTL_TO_PREAMB(word));
 269        word = inw(iobase+VLSI_PIO_NPHYCTL);
 270        seq_printf(seq, "NPHYCTL: baud-divisor=%u / pulsewidth=%u / preamble=%u\n",
 271                (unsigned)PHYCTL_TO_BAUD(word),
 272                (unsigned)PHYCTL_TO_PLSWID(word),
 273                (unsigned)PHYCTL_TO_PREAMB(word));
 274        word = inw(iobase+VLSI_PIO_MAXPKT);
 275        seq_printf(seq, "MAXPKT: max. rx packet size = %u\n", word);
 276        word = inw(iobase+VLSI_PIO_RCVBCNT) & RCVBCNT_MASK;
 277        seq_printf(seq, "RCVBCNT: rx-fifo filling level = %u\n", word);
 278
 279        seq_printf(seq, "\nsw-state:\n");
 280        seq_printf(seq, "IrPHY setup: %d baud - %s encoding\n", idev->baud, 
 281                (idev->mode==IFF_SIR)?"SIR":((idev->mode==IFF_MIR)?"MIR":"FIR"));
 282        do_gettimeofday(&now);
 283        if (now.tv_usec >= idev->last_rx.tv_usec) {
 284                delta2 = now.tv_usec - idev->last_rx.tv_usec;
 285                delta1 = 0;
 286        }
 287        else {
 288                delta2 = 1000000 + now.tv_usec - idev->last_rx.tv_usec;
 289                delta1 = 1;
 290        }
 291        seq_printf(seq, "last rx: %lu.%06u sec\n",
 292                now.tv_sec - idev->last_rx.tv_sec - delta1, delta2);    
 293
 294        seq_printf(seq, "RX: packets=%lu / bytes=%lu / errors=%lu / dropped=%lu",
 295                ndev->stats.rx_packets, ndev->stats.rx_bytes, ndev->stats.rx_errors,
 296                ndev->stats.rx_dropped);
 297        seq_printf(seq, " / overrun=%lu / length=%lu / frame=%lu / crc=%lu\n",
 298                ndev->stats.rx_over_errors, ndev->stats.rx_length_errors,
 299                ndev->stats.rx_frame_errors, ndev->stats.rx_crc_errors);
 300        seq_printf(seq, "TX: packets=%lu / bytes=%lu / errors=%lu / dropped=%lu / fifo=%lu\n",
 301                ndev->stats.tx_packets, ndev->stats.tx_bytes, ndev->stats.tx_errors,
 302                ndev->stats.tx_dropped, ndev->stats.tx_fifo_errors);
 303
 304}
 305                
 306static void vlsi_proc_ring(struct seq_file *seq, struct vlsi_ring *r)
 307{
 308        struct ring_descr *rd;
 309        unsigned i, j;
 310        int h, t;
 311
 312        seq_printf(seq, "size %u / mask 0x%04x / len %u / dir %d / hw %p\n",
 313                r->size, r->mask, r->len, r->dir, r->rd[0].hw);
 314        h = atomic_read(&r->head) & r->mask;
 315        t = atomic_read(&r->tail) & r->mask;
 316        seq_printf(seq, "head = %d / tail = %d ", h, t);
 317        if (h == t)
 318                seq_printf(seq, "(empty)\n");
 319        else {
 320                if (((t+1)&r->mask) == h)
 321                        seq_printf(seq, "(full)\n");
 322                else
 323                        seq_printf(seq, "(level = %d)\n", ((unsigned)(t-h) & r->mask)); 
 324                rd = &r->rd[h];
 325                j = (unsigned) rd_get_count(rd);
 326                seq_printf(seq, "current: rd = %d / status = %02x / len = %u\n",
 327                                h, (unsigned)rd_get_status(rd), j);
 328                if (j > 0) {
 329                        seq_printf(seq, "   data:");
 330                        if (j > 20)
 331                                j = 20;
 332                        for (i = 0; i < j; i++)
 333                                seq_printf(seq, " %02x", (unsigned)((unsigned char *)rd->buf)[i]);
 334                        seq_printf(seq, "\n");
 335                }
 336        }
 337        for (i = 0; i < r->size; i++) {
 338                rd = &r->rd[i];
 339                seq_printf(seq, "> ring descr %u: ", i);
 340                seq_printf(seq, "skb=%p data=%p hw=%p\n", rd->skb, rd->buf, rd->hw);
 341                seq_printf(seq, "  hw: status=%02x count=%u busaddr=0x%08x\n",
 342                        (unsigned) rd_get_status(rd),
 343                        (unsigned) rd_get_count(rd), (unsigned) rd_get_addr(rd));
 344        }
 345}
 346
 347static int vlsi_seq_show(struct seq_file *seq, void *v)
 348{
 349        struct net_device *ndev = seq->private;
 350        vlsi_irda_dev_t *idev = netdev_priv(ndev);
 351        unsigned long flags;
 352
 353        seq_printf(seq, "\n%s %s\n\n", DRIVER_NAME, DRIVER_VERSION);
 354        seq_printf(seq, "clksrc: %s\n", 
 355                (clksrc>=2) ? ((clksrc==3)?"40MHz XCLK":"48MHz XCLK")
 356                            : ((clksrc==1)?"48MHz PLL":"autodetect"));
 357        seq_printf(seq, "ringsize: tx=%d / rx=%d\n",
 358                ringsize[0], ringsize[1]);
 359        seq_printf(seq, "sirpulse: %s\n", (sirpulse)?"3/16 bittime":"short");
 360        seq_printf(seq, "qos_mtt_bits: 0x%02x\n", (unsigned)qos_mtt_bits);
 361
 362        spin_lock_irqsave(&idev->lock, flags);
 363        if (idev->pdev != NULL) {
 364                vlsi_proc_pdev(seq, idev->pdev);
 365
 366                if (idev->pdev->current_state == 0)
 367                        vlsi_proc_ndev(seq, ndev);
 368                else
 369                        seq_printf(seq, "\nPCI controller down - resume_ok = %d\n",
 370                                idev->resume_ok);
 371                if (netif_running(ndev) && idev->rx_ring && idev->tx_ring) {
 372                        seq_printf(seq, "\n--------- RX ring -----------\n\n");
 373                        vlsi_proc_ring(seq, idev->rx_ring);
 374                        seq_printf(seq, "\n--------- TX ring -----------\n\n");
 375                        vlsi_proc_ring(seq, idev->tx_ring);
 376                }
 377        }
 378        seq_printf(seq, "\n");
 379        spin_unlock_irqrestore(&idev->lock, flags);
 380
 381        return 0;
 382}
 383
 384static int vlsi_seq_open(struct inode *inode, struct file *file)
 385{
 386        return single_open(file, vlsi_seq_show, PDE(inode)->data);
 387}
 388
 389static const struct file_operations vlsi_proc_fops = {
 390        .owner   = THIS_MODULE,
 391        .open    = vlsi_seq_open,
 392        .read    = seq_read,
 393        .llseek  = seq_lseek,
 394        .release = single_release,
 395};
 396
 397#define VLSI_PROC_FOPS          (&vlsi_proc_fops)
 398
 399#else   /* CONFIG_PROC_FS */
 400#define VLSI_PROC_FOPS          NULL
 401#endif
 402
 403/********************************************************/
 404
 405static struct vlsi_ring *vlsi_alloc_ring(struct pci_dev *pdev, struct ring_descr_hw *hwmap,
 406                                                unsigned size, unsigned len, int dir)
 407{
 408        struct vlsi_ring *r;
 409        struct ring_descr *rd;
 410        unsigned        i, j;
 411        dma_addr_t      busaddr;
 412
 413        if (!size  ||  ((size-1)&size)!=0)      /* must be >0 and power of 2 */
 414                return NULL;
 415
 416        r = kmalloc(sizeof(*r) + size * sizeof(struct ring_descr), GFP_KERNEL);
 417        if (!r)
 418                return NULL;
 419        memset(r, 0, sizeof(*r));
 420
 421        r->pdev = pdev;
 422        r->dir = dir;
 423        r->len = len;
 424        r->rd = (struct ring_descr *)(r+1);
 425        r->mask = size - 1;
 426        r->size = size;
 427        atomic_set(&r->head, 0);
 428        atomic_set(&r->tail, 0);
 429
 430        for (i = 0; i < size; i++) {
 431                rd = r->rd + i;
 432                memset(rd, 0, sizeof(*rd));
 433                rd->hw = hwmap + i;
 434                rd->buf = kmalloc(len, GFP_KERNEL|GFP_DMA);
 435                if (rd->buf == NULL ||
 436                    !(busaddr = pci_map_single(pdev, rd->buf, len, dir))) {
 437                        if (rd->buf) {
 438                                IRDA_ERROR("%s: failed to create PCI-MAP for %p",
 439                                           __func__, rd->buf);
 440                                kfree(rd->buf);
 441                                rd->buf = NULL;
 442                        }
 443                        for (j = 0; j < i; j++) {
 444                                rd = r->rd + j;
 445                                busaddr = rd_get_addr(rd);
 446                                rd_set_addr_status(rd, 0, 0);
 447                                if (busaddr)
 448                                        pci_unmap_single(pdev, busaddr, len, dir);
 449                                kfree(rd->buf);
 450                                rd->buf = NULL;
 451                        }
 452                        kfree(r);
 453                        return NULL;
 454                }
 455                rd_set_addr_status(rd, busaddr, 0);
 456                /* initially, the dma buffer is owned by the CPU */
 457                rd->skb = NULL;
 458        }
 459        return r;
 460}
 461
 462static int vlsi_free_ring(struct vlsi_ring *r)
 463{
 464        struct ring_descr *rd;
 465        unsigned        i;
 466        dma_addr_t      busaddr;
 467
 468        for (i = 0; i < r->size; i++) {
 469                rd = r->rd + i;
 470                if (rd->skb)
 471                        dev_kfree_skb_any(rd->skb);
 472                busaddr = rd_get_addr(rd);
 473                rd_set_addr_status(rd, 0, 0);
 474                if (busaddr)
 475                        pci_unmap_single(r->pdev, busaddr, r->len, r->dir);
 476                kfree(rd->buf);
 477        }
 478        kfree(r);
 479        return 0;
 480}
 481
 482static int vlsi_create_hwif(vlsi_irda_dev_t *idev)
 483{
 484        char                    *ringarea;
 485        struct ring_descr_hw    *hwmap;
 486
 487        idev->virtaddr = NULL;
 488        idev->busaddr = 0;
 489
 490        ringarea = pci_alloc_consistent(idev->pdev, HW_RING_AREA_SIZE, &idev->busaddr);
 491        if (!ringarea) {
 492                IRDA_ERROR("%s: insufficient memory for descriptor rings\n",
 493                           __func__);
 494                goto out;
 495        }
 496        memset(ringarea, 0, HW_RING_AREA_SIZE);
 497
 498        hwmap = (struct ring_descr_hw *)ringarea;
 499        idev->rx_ring = vlsi_alloc_ring(idev->pdev, hwmap, ringsize[1],
 500                                        XFER_BUF_SIZE, PCI_DMA_FROMDEVICE);
 501        if (idev->rx_ring == NULL)
 502                goto out_unmap;
 503
 504        hwmap += MAX_RING_DESCR;
 505        idev->tx_ring = vlsi_alloc_ring(idev->pdev, hwmap, ringsize[0],
 506                                        XFER_BUF_SIZE, PCI_DMA_TODEVICE);
 507        if (idev->tx_ring == NULL)
 508                goto out_free_rx;
 509
 510        idev->virtaddr = ringarea;
 511        return 0;
 512
 513out_free_rx:
 514        vlsi_free_ring(idev->rx_ring);
 515out_unmap:
 516        idev->rx_ring = idev->tx_ring = NULL;
 517        pci_free_consistent(idev->pdev, HW_RING_AREA_SIZE, ringarea, idev->busaddr);
 518        idev->busaddr = 0;
 519out:
 520        return -ENOMEM;
 521}
 522
 523static int vlsi_destroy_hwif(vlsi_irda_dev_t *idev)
 524{
 525        vlsi_free_ring(idev->rx_ring);
 526        vlsi_free_ring(idev->tx_ring);
 527        idev->rx_ring = idev->tx_ring = NULL;
 528
 529        if (idev->busaddr)
 530                pci_free_consistent(idev->pdev,HW_RING_AREA_SIZE,idev->virtaddr,idev->busaddr);
 531
 532        idev->virtaddr = NULL;
 533        idev->busaddr = 0;
 534
 535        return 0;
 536}
 537
 538/********************************************************/
 539
 540static int vlsi_process_rx(struct vlsi_ring *r, struct ring_descr *rd)
 541{
 542        u16             status;
 543        int             crclen, len = 0;
 544        struct sk_buff  *skb;
 545        int             ret = 0;
 546        struct net_device *ndev = (struct net_device *)pci_get_drvdata(r->pdev);
 547        vlsi_irda_dev_t *idev = netdev_priv(ndev);
 548
 549        pci_dma_sync_single_for_cpu(r->pdev, rd_get_addr(rd), r->len, r->dir);
 550        /* dma buffer now owned by the CPU */
 551        status = rd_get_status(rd);
 552        if (status & RD_RX_ERROR) {
 553                if (status & RD_RX_OVER)  
 554                        ret |= VLSI_RX_OVER;
 555                if (status & RD_RX_LENGTH)  
 556                        ret |= VLSI_RX_LENGTH;
 557                if (status & RD_RX_PHYERR)  
 558                        ret |= VLSI_RX_FRAME;
 559                if (status & RD_RX_CRCERR)  
 560                        ret |= VLSI_RX_CRC;
 561                goto done;
 562        }
 563
 564        len = rd_get_count(rd);
 565        crclen = (idev->mode==IFF_FIR) ? sizeof(u32) : sizeof(u16);
 566        len -= crclen;          /* remove trailing CRC */
 567        if (len <= 0) {
 568                IRDA_DEBUG(0, "%s: strange frame (len=%d)\n", __func__, len);
 569                ret |= VLSI_RX_DROP;
 570                goto done;
 571        }
 572
 573        if (idev->mode == IFF_SIR) {    /* hw checks CRC in MIR, FIR mode */
 574
 575                /* rd->buf is a streaming PCI_DMA_FROMDEVICE map. Doing the
 576                 * endian-adjustment there just in place will dirty a cache line
 577                 * which belongs to the map and thus we must be sure it will
 578                 * get flushed before giving the buffer back to hardware.
 579                 * vlsi_fill_rx() will do this anyway - but here we rely on.
 580                 */
 581                le16_to_cpus(rd->buf+len);
 582                if (irda_calc_crc16(INIT_FCS,rd->buf,len+crclen) != GOOD_FCS) {
 583                        IRDA_DEBUG(0, "%s: crc error\n", __func__);
 584                        ret |= VLSI_RX_CRC;
 585                        goto done;
 586                }
 587        }
 588
 589        if (!rd->skb) {
 590                IRDA_WARNING("%s: rx packet lost\n", __func__);
 591                ret |= VLSI_RX_DROP;
 592                goto done;
 593        }
 594
 595        skb = rd->skb;
 596        rd->skb = NULL;
 597        skb->dev = ndev;
 598        memcpy(skb_put(skb,len), rd->buf, len);
 599        skb_reset_mac_header(skb);
 600        if (in_interrupt())
 601                netif_rx(skb);
 602        else
 603                netif_rx_ni(skb);
 604
 605done:
 606        rd_set_status(rd, 0);
 607        rd_set_count(rd, 0);
 608        /* buffer still owned by CPU */
 609
 610        return (ret) ? -ret : len;
 611}
 612
 613static void vlsi_fill_rx(struct vlsi_ring *r)
 614{
 615        struct ring_descr *rd;
 616
 617        for (rd = ring_last(r); rd != NULL; rd = ring_put(r)) {
 618                if (rd_is_active(rd)) {
 619                        IRDA_WARNING("%s: driver bug: rx descr race with hw\n",
 620                                     __func__);
 621                        vlsi_ring_debug(r);
 622                        break;
 623                }
 624                if (!rd->skb) {
 625                        rd->skb = dev_alloc_skb(IRLAP_SKB_ALLOCSIZE);
 626                        if (rd->skb) {
 627                                skb_reserve(rd->skb,1);
 628                                rd->skb->protocol = htons(ETH_P_IRDA);
 629                        }
 630                        else
 631                                break;  /* probably not worth logging? */
 632                }
 633                /* give dma buffer back to busmaster */
 634                pci_dma_sync_single_for_device(r->pdev, rd_get_addr(rd), r->len, r->dir);
 635                rd_activate(rd);
 636        }
 637}
 638
 639static void vlsi_rx_interrupt(struct net_device *ndev)
 640{
 641        vlsi_irda_dev_t *idev = netdev_priv(ndev);
 642        struct vlsi_ring *r = idev->rx_ring;
 643        struct ring_descr *rd;
 644        int ret;
 645
 646        for (rd = ring_first(r); rd != NULL; rd = ring_get(r)) {
 647
 648                if (rd_is_active(rd))
 649                        break;
 650
 651                ret = vlsi_process_rx(r, rd);
 652
 653                if (ret < 0) {
 654                        ret = -ret;
 655                        ndev->stats.rx_errors++;
 656                        if (ret & VLSI_RX_DROP)  
 657                                ndev->stats.rx_dropped++;
 658                        if (ret & VLSI_RX_OVER)  
 659                                ndev->stats.rx_over_errors++;
 660                        if (ret & VLSI_RX_LENGTH)  
 661                                ndev->stats.rx_length_errors++;
 662                        if (ret & VLSI_RX_FRAME)  
 663                                ndev->stats.rx_frame_errors++;
 664                        if (ret & VLSI_RX_CRC)  
 665                                ndev->stats.rx_crc_errors++;
 666                }
 667                else if (ret > 0) {
 668                        ndev->stats.rx_packets++;
 669                        ndev->stats.rx_bytes += ret;
 670                }
 671        }
 672
 673        do_gettimeofday(&idev->last_rx); /* remember "now" for later mtt delay */
 674
 675        vlsi_fill_rx(r);
 676
 677        if (ring_first(r) == NULL) {
 678                /* we are in big trouble, if this should ever happen */
 679                IRDA_ERROR("%s: rx ring exhausted!\n", __func__);
 680                vlsi_ring_debug(r);
 681        }
 682        else
 683                outw(0, ndev->base_addr+VLSI_PIO_PROMPT);
 684}
 685
 686/* caller must have stopped the controller from busmastering */
 687
 688static void vlsi_unarm_rx(vlsi_irda_dev_t *idev)
 689{
 690        struct net_device *ndev = pci_get_drvdata(idev->pdev);
 691        struct vlsi_ring *r = idev->rx_ring;
 692        struct ring_descr *rd;
 693        int ret;
 694
 695        for (rd = ring_first(r); rd != NULL; rd = ring_get(r)) {
 696
 697                ret = 0;
 698                if (rd_is_active(rd)) {
 699                        rd_set_status(rd, 0);
 700                        if (rd_get_count(rd)) {
 701                                IRDA_DEBUG(0, "%s - dropping rx packet\n", __func__);
 702                                ret = -VLSI_RX_DROP;
 703                        }
 704                        rd_set_count(rd, 0);
 705                        pci_dma_sync_single_for_cpu(r->pdev, rd_get_addr(rd), r->len, r->dir);
 706                        if (rd->skb) {
 707                                dev_kfree_skb_any(rd->skb);
 708                                rd->skb = NULL;
 709                        }
 710                }
 711                else
 712                        ret = vlsi_process_rx(r, rd);
 713
 714                if (ret < 0) {
 715                        ret = -ret;
 716                        ndev->stats.rx_errors++;
 717                        if (ret & VLSI_RX_DROP)  
 718                                ndev->stats.rx_dropped++;
 719                        if (ret & VLSI_RX_OVER)  
 720                                ndev->stats.rx_over_errors++;
 721                        if (ret & VLSI_RX_LENGTH)  
 722                                ndev->stats.rx_length_errors++;
 723                        if (ret & VLSI_RX_FRAME)  
 724                                ndev->stats.rx_frame_errors++;
 725                        if (ret & VLSI_RX_CRC)  
 726                                ndev->stats.rx_crc_errors++;
 727                }
 728                else if (ret > 0) {
 729                        ndev->stats.rx_packets++;
 730                        ndev->stats.rx_bytes += ret;
 731                }
 732        }
 733}
 734
 735/********************************************************/
 736
 737static int vlsi_process_tx(struct vlsi_ring *r, struct ring_descr *rd)
 738{
 739        u16             status;
 740        int             len;
 741        int             ret;
 742
 743        pci_dma_sync_single_for_cpu(r->pdev, rd_get_addr(rd), r->len, r->dir);
 744        /* dma buffer now owned by the CPU */
 745        status = rd_get_status(rd);
 746        if (status & RD_TX_UNDRN)
 747                ret = VLSI_TX_FIFO;
 748        else
 749                ret = 0;
 750        rd_set_status(rd, 0);
 751
 752        if (rd->skb) {
 753                len = rd->skb->len;
 754                dev_kfree_skb_any(rd->skb);
 755                rd->skb = NULL;
 756        }
 757        else    /* tx-skb already freed? - should never happen */
 758                len = rd_get_count(rd);         /* incorrect for SIR! (due to wrapping) */
 759
 760        rd_set_count(rd, 0);
 761        /* dma buffer still owned by the CPU */
 762
 763        return (ret) ? -ret : len;
 764}
 765
 766static int vlsi_set_baud(vlsi_irda_dev_t *idev, unsigned iobase)
 767{
 768        u16 nphyctl;
 769        u16 config;
 770        unsigned mode;
 771        int     ret;
 772        int     baudrate;
 773        int     fifocnt;
 774
 775        baudrate = idev->new_baud;
 776        IRDA_DEBUG(2, "%s: %d -> %d\n", __func__, idev->baud, idev->new_baud);
 777        if (baudrate == 4000000) {
 778                mode = IFF_FIR;
 779                config = IRCFG_FIR;
 780                nphyctl = PHYCTL_FIR;
 781        }
 782        else if (baudrate == 1152000) {
 783                mode = IFF_MIR;
 784                config = IRCFG_MIR | IRCFG_CRC16;
 785                nphyctl = PHYCTL_MIR(clksrc==3);
 786        }
 787        else {
 788                mode = IFF_SIR;
 789                config = IRCFG_SIR | IRCFG_SIRFILT  | IRCFG_RXANY;
 790                switch(baudrate) {
 791                        default:
 792                                IRDA_WARNING("%s: undefined baudrate %d - fallback to 9600!\n",
 793                                             __func__, baudrate);
 794                                baudrate = 9600;
 795                                /* fallthru */
 796                        case 2400:
 797                        case 9600:
 798                        case 19200:
 799                        case 38400:
 800                        case 57600:
 801                        case 115200:
 802                                nphyctl = PHYCTL_SIR(baudrate,sirpulse,clksrc==3);
 803                                break;
 804                }
 805        }
 806        config |= IRCFG_MSTR | IRCFG_ENRX;
 807
 808        fifocnt = inw(iobase+VLSI_PIO_RCVBCNT) & RCVBCNT_MASK;
 809        if (fifocnt != 0) {
 810                IRDA_DEBUG(0, "%s: rx fifo not empty(%d)\n", __func__, fifocnt);
 811        }
 812
 813        outw(0, iobase+VLSI_PIO_IRENABLE);
 814        outw(config, iobase+VLSI_PIO_IRCFG);
 815        outw(nphyctl, iobase+VLSI_PIO_NPHYCTL);
 816        wmb();
 817        outw(IRENABLE_PHYANDCLOCK, iobase+VLSI_PIO_IRENABLE);
 818        mb();
 819
 820        udelay(1);      /* chip applies IRCFG on next rising edge of its 8MHz clock */
 821
 822        /* read back settings for validation */
 823
 824        config = inw(iobase+VLSI_PIO_IRENABLE) & IRENABLE_MASK;
 825
 826        if (mode == IFF_FIR)
 827                config ^= IRENABLE_FIR_ON;
 828        else if (mode == IFF_MIR)
 829                config ^= (IRENABLE_MIR_ON|IRENABLE_CRC16_ON);
 830        else
 831                config ^= IRENABLE_SIR_ON;
 832
 833        if (config != (IRENABLE_PHYANDCLOCK|IRENABLE_ENRXST)) {
 834                IRDA_WARNING("%s: failed to set %s mode!\n", __func__,
 835                        (mode==IFF_SIR)?"SIR":((mode==IFF_MIR)?"MIR":"FIR"));
 836                ret = -1;
 837        }
 838        else {
 839                if (inw(iobase+VLSI_PIO_PHYCTL) != nphyctl) {
 840                        IRDA_WARNING("%s: failed to apply baudrate %d\n",
 841                                     __func__, baudrate);
 842                        ret = -1;
 843                }
 844                else {
 845                        idev->mode = mode;
 846                        idev->baud = baudrate;
 847                        idev->new_baud = 0;
 848                        ret = 0;
 849                }
 850        }
 851
 852        if (ret)
 853                vlsi_reg_debug(iobase,__func__);
 854
 855        return ret;
 856}
 857
 858static netdev_tx_t vlsi_hard_start_xmit(struct sk_buff *skb,
 859                                              struct net_device *ndev)
 860{
 861        vlsi_irda_dev_t *idev = netdev_priv(ndev);
 862        struct vlsi_ring        *r = idev->tx_ring;
 863        struct ring_descr *rd;
 864        unsigned long flags;
 865        unsigned iobase = ndev->base_addr;
 866        u8 status;
 867        u16 config;
 868        int mtt;
 869        int len, speed;
 870        struct timeval  now, ready;
 871        char *msg = NULL;
 872
 873        speed = irda_get_next_speed(skb);
 874        spin_lock_irqsave(&idev->lock, flags);
 875        if (speed != -1  &&  speed != idev->baud) {
 876                netif_stop_queue(ndev);
 877                idev->new_baud = speed;
 878                status = RD_TX_CLRENTX;  /* stop tx-ring after this frame */
 879        }
 880        else
 881                status = 0;
 882
 883        if (skb->len == 0) {
 884                /* handle zero packets - should be speed change */
 885                if (status == 0) {
 886                        msg = "bogus zero-length packet";
 887                        goto drop_unlock;
 888                }
 889
 890                /* due to the completely asynch tx operation we might have
 891                 * IrLAP racing with the hardware here, f.e. if the controller
 892                 * is just sending the last packet with current speed while
 893                 * the LAP is already switching the speed using synchronous
 894                 * len=0 packet. Immediate execution would lead to hw lockup
 895                 * requiring a powercycle to reset. Good candidate to trigger
 896                 * this is the final UA:RSP packet after receiving a DISC:CMD
 897                 * when getting the LAP down.
 898                 * Note that we are not protected by the queue_stop approach
 899                 * because the final UA:RSP arrives _without_ request to apply
 900                 * new-speed-after-this-packet - hence the driver doesn't know
 901                 * this was the last packet and doesn't stop the queue. So the
 902                 * forced switch to default speed from LAP gets through as fast
 903                 * as only some 10 usec later while the UA:RSP is still processed
 904                 * by the hardware and we would get screwed.
 905                 */
 906
 907                if (ring_first(idev->tx_ring) == NULL) {
 908                        /* no race - tx-ring already empty */
 909                        vlsi_set_baud(idev, iobase);
 910                        netif_wake_queue(ndev);
 911                }
 912                else
 913                        ;
 914                        /* keep the speed change pending like it would
 915                         * for any len>0 packet. tx completion interrupt
 916                         * will apply it when the tx ring becomes empty.
 917                         */
 918                spin_unlock_irqrestore(&idev->lock, flags);
 919                dev_kfree_skb_any(skb);
 920                return NETDEV_TX_OK;
 921        }
 922
 923        /* sanity checks - simply drop the packet */
 924
 925        rd = ring_last(r);
 926        if (!rd) {
 927                msg = "ring full, but queue wasn't stopped";
 928                goto drop_unlock;
 929        }
 930
 931        if (rd_is_active(rd)) {
 932                msg = "entry still owned by hw";
 933                goto drop_unlock;
 934        }
 935
 936        if (!rd->buf) {
 937                msg = "tx ring entry without pci buffer";
 938                goto drop_unlock;
 939        }
 940
 941        if (rd->skb) {
 942                msg = "ring entry with old skb still attached";
 943                goto drop_unlock;
 944        }
 945
 946        /* no need for serialization or interrupt disable during mtt */
 947        spin_unlock_irqrestore(&idev->lock, flags);
 948
 949        if ((mtt = irda_get_mtt(skb)) > 0) {
 950        
 951                ready.tv_usec = idev->last_rx.tv_usec + mtt;
 952                ready.tv_sec = idev->last_rx.tv_sec;
 953                if (ready.tv_usec >= 1000000) {
 954                        ready.tv_usec -= 1000000;
 955                        ready.tv_sec++;         /* IrLAP 1.1: mtt always < 1 sec */
 956                }
 957                for(;;) {
 958                        do_gettimeofday(&now);
 959                        if (now.tv_sec > ready.tv_sec ||
 960                            (now.tv_sec==ready.tv_sec && now.tv_usec>=ready.tv_usec))
 961                                break;
 962                        udelay(100);
 963                        /* must not sleep here - called under netif_tx_lock! */
 964                }
 965        }
 966
 967        /* tx buffer already owned by CPU due to pci_dma_sync_single_for_cpu()
 968         * after subsequent tx-completion
 969         */
 970
 971        if (idev->mode == IFF_SIR) {
 972                status |= RD_TX_DISCRC;         /* no hw-crc creation */
 973                len = async_wrap_skb(skb, rd->buf, r->len);
 974
 975                /* Some rare worst case situation in SIR mode might lead to
 976                 * potential buffer overflow. The wrapper detects this, returns
 977                 * with a shortened frame (without FCS/EOF) but doesn't provide
 978                 * any error indication about the invalid packet which we are
 979                 * going to transmit.
 980                 * Therefore we log if the buffer got filled to the point, where the
 981                 * wrapper would abort, i.e. when there are less than 5 bytes left to
 982                 * allow appending the FCS/EOF.
 983                 */
 984
 985                if (len >= r->len-5)
 986                         IRDA_WARNING("%s: possible buffer overflow with SIR wrapping!\n",
 987                                      __func__);
 988        }
 989        else {
 990                /* hw deals with MIR/FIR mode wrapping */
 991                status |= RD_TX_PULSE;          /* send 2 us highspeed indication pulse */
 992                len = skb->len;
 993                if (len > r->len) {
 994                        msg = "frame exceeds tx buffer length";
 995                        goto drop;
 996                }
 997                else
 998                        skb_copy_from_linear_data(skb, rd->buf, len);
 999        }
1000
1001        rd->skb = skb;                  /* remember skb for tx-complete stats */
1002
1003        rd_set_count(rd, len);
1004        rd_set_status(rd, status);      /* not yet active! */
1005
1006        /* give dma buffer back to busmaster-hw (flush caches to make
1007         * CPU-driven changes visible from the pci bus).
1008         */
1009
1010        pci_dma_sync_single_for_device(r->pdev, rd_get_addr(rd), r->len, r->dir);
1011
1012/*      Switching to TX mode here races with the controller
1013 *      which may stop TX at any time when fetching an inactive descriptor
1014 *      or one with CLR_ENTX set. So we switch on TX only, if TX was not running
1015 *      _after_ the new descriptor was activated on the ring. This ensures
1016 *      we will either find TX already stopped or we can be sure, there
1017 *      will be a TX-complete interrupt even if the chip stopped doing
1018 *      TX just after we found it still running. The ISR will then find
1019 *      the non-empty ring and restart TX processing. The enclosing
1020 *      spinlock provides the correct serialization to prevent race with isr.
1021 */
1022
1023        spin_lock_irqsave(&idev->lock,flags);
1024
1025        rd_activate(rd);
1026
1027        if (!(inw(iobase+VLSI_PIO_IRENABLE) & IRENABLE_ENTXST)) {
1028                int fifocnt;
1029
1030                fifocnt = inw(ndev->base_addr+VLSI_PIO_RCVBCNT) & RCVBCNT_MASK;
1031                if (fifocnt != 0) {
1032                        IRDA_DEBUG(0, "%s: rx fifo not empty(%d)\n", __func__, fifocnt);
1033                }
1034
1035                config = inw(iobase+VLSI_PIO_IRCFG);
1036                mb();
1037                outw(config | IRCFG_ENTX, iobase+VLSI_PIO_IRCFG);
1038                wmb();
1039                outw(0, iobase+VLSI_PIO_PROMPT);
1040        }
1041
1042        if (ring_put(r) == NULL) {
1043                netif_stop_queue(ndev);
1044                IRDA_DEBUG(3, "%s: tx ring full - queue stopped\n", __func__);
1045        }
1046        spin_unlock_irqrestore(&idev->lock, flags);
1047
1048        return NETDEV_TX_OK;
1049
1050drop_unlock:
1051        spin_unlock_irqrestore(&idev->lock, flags);
1052drop:
1053        IRDA_WARNING("%s: dropping packet - %s\n", __func__, msg);
1054        dev_kfree_skb_any(skb);
1055        ndev->stats.tx_errors++;
1056        ndev->stats.tx_dropped++;
1057        /* Don't even think about returning NET_XMIT_DROP (=1) here!
1058         * In fact any retval!=0 causes the packet scheduler to requeue the
1059         * packet for later retry of transmission - which isn't exactly
1060         * what we want after we've just called dev_kfree_skb_any ;-)
1061         */
1062        return NETDEV_TX_OK;
1063}
1064
1065static void vlsi_tx_interrupt(struct net_device *ndev)
1066{
1067        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1068        struct vlsi_ring        *r = idev->tx_ring;
1069        struct ring_descr       *rd;
1070        unsigned        iobase;
1071        int     ret;
1072        u16     config;
1073
1074        for (rd = ring_first(r); rd != NULL; rd = ring_get(r)) {
1075
1076                if (rd_is_active(rd))
1077                        break;
1078
1079                ret = vlsi_process_tx(r, rd);
1080
1081                if (ret < 0) {
1082                        ret = -ret;
1083                        ndev->stats.tx_errors++;
1084                        if (ret & VLSI_TX_DROP)
1085                                ndev->stats.tx_dropped++;
1086                        if (ret & VLSI_TX_FIFO)
1087                                ndev->stats.tx_fifo_errors++;
1088                }
1089                else if (ret > 0){
1090                        ndev->stats.tx_packets++;
1091                        ndev->stats.tx_bytes += ret;
1092                }
1093        }
1094
1095        iobase = ndev->base_addr;
1096
1097        if (idev->new_baud  &&  rd == NULL)     /* tx ring empty and speed change pending */
1098                vlsi_set_baud(idev, iobase);
1099
1100        config = inw(iobase+VLSI_PIO_IRCFG);
1101        if (rd == NULL)                 /* tx ring empty: re-enable rx */
1102                outw((config & ~IRCFG_ENTX) | IRCFG_ENRX, iobase+VLSI_PIO_IRCFG);
1103
1104        else if (!(inw(iobase+VLSI_PIO_IRENABLE) & IRENABLE_ENTXST)) {
1105                int fifocnt;
1106
1107                fifocnt = inw(iobase+VLSI_PIO_RCVBCNT) & RCVBCNT_MASK;
1108                if (fifocnt != 0) {
1109                        IRDA_DEBUG(0, "%s: rx fifo not empty(%d)\n",
1110                                __func__, fifocnt);
1111                }
1112                outw(config | IRCFG_ENTX, iobase+VLSI_PIO_IRCFG);
1113        }
1114
1115        outw(0, iobase+VLSI_PIO_PROMPT);
1116
1117        if (netif_queue_stopped(ndev)  &&  !idev->new_baud) {
1118                netif_wake_queue(ndev);
1119                IRDA_DEBUG(3, "%s: queue awoken\n", __func__);
1120        }
1121}
1122
1123/* caller must have stopped the controller from busmastering */
1124
1125static void vlsi_unarm_tx(vlsi_irda_dev_t *idev)
1126{
1127        struct net_device *ndev = pci_get_drvdata(idev->pdev);
1128        struct vlsi_ring *r = idev->tx_ring;
1129        struct ring_descr *rd;
1130        int ret;
1131
1132        for (rd = ring_first(r); rd != NULL; rd = ring_get(r)) {
1133
1134                ret = 0;
1135                if (rd_is_active(rd)) {
1136                        rd_set_status(rd, 0);
1137                        rd_set_count(rd, 0);
1138                        pci_dma_sync_single_for_cpu(r->pdev, rd_get_addr(rd), r->len, r->dir);
1139                        if (rd->skb) {
1140                                dev_kfree_skb_any(rd->skb);
1141                                rd->skb = NULL;
1142                        }
1143                        IRDA_DEBUG(0, "%s - dropping tx packet\n", __func__);
1144                        ret = -VLSI_TX_DROP;
1145                }
1146                else
1147                        ret = vlsi_process_tx(r, rd);
1148
1149                if (ret < 0) {
1150                        ret = -ret;
1151                        ndev->stats.tx_errors++;
1152                        if (ret & VLSI_TX_DROP)
1153                                ndev->stats.tx_dropped++;
1154                        if (ret & VLSI_TX_FIFO)
1155                                ndev->stats.tx_fifo_errors++;
1156                }
1157                else if (ret > 0){
1158                        ndev->stats.tx_packets++;
1159                        ndev->stats.tx_bytes += ret;
1160                }
1161        }
1162
1163}
1164
1165/********************************************************/
1166
1167static int vlsi_start_clock(struct pci_dev *pdev)
1168{
1169        u8      clkctl, lock;
1170        int     i, count;
1171
1172        if (clksrc < 2) { /* auto or PLL: try PLL */
1173                clkctl = CLKCTL_PD_INV | CLKCTL_CLKSTP;
1174                pci_write_config_byte(pdev, VLSI_PCI_CLKCTL, clkctl);
1175
1176                /* procedure to detect PLL lock synchronisation:
1177                 * after 0.5 msec initial delay we expect to find 3 PLL lock
1178                 * indications within 10 msec for successful PLL detection.
1179                 */
1180                udelay(500);
1181                count = 0;
1182                for (i = 500; i <= 10000; i += 50) { /* max 10 msec */
1183                        pci_read_config_byte(pdev, VLSI_PCI_CLKCTL, &lock);
1184                        if (lock&CLKCTL_LOCK) {
1185                                if (++count >= 3)
1186                                        break;
1187                        }
1188                        udelay(50);
1189                }
1190                if (count < 3) {
1191                        if (clksrc == 1) { /* explicitly asked for PLL hence bail out */
1192                                IRDA_ERROR("%s: no PLL or failed to lock!\n",
1193                                           __func__);
1194                                clkctl = CLKCTL_CLKSTP;
1195                                pci_write_config_byte(pdev, VLSI_PCI_CLKCTL, clkctl);
1196                                return -1;
1197                        }
1198                        else                    /* was: clksrc=0(auto) */
1199                                clksrc = 3;     /* fallback to 40MHz XCLK (OB800) */
1200
1201                        IRDA_DEBUG(0, "%s: PLL not locked, fallback to clksrc=%d\n",
1202                                __func__, clksrc);
1203                }
1204                else
1205                        clksrc = 1;     /* got successful PLL lock */
1206        }
1207
1208        if (clksrc != 1) {
1209                /* we get here if either no PLL detected in auto-mode or
1210                   an external clock source was explicitly specified */
1211
1212                clkctl = CLKCTL_EXTCLK | CLKCTL_CLKSTP;
1213                if (clksrc == 3)
1214                        clkctl |= CLKCTL_XCKSEL;        
1215                pci_write_config_byte(pdev, VLSI_PCI_CLKCTL, clkctl);
1216
1217                /* no way to test for working XCLK */
1218        }
1219        else
1220                pci_read_config_byte(pdev, VLSI_PCI_CLKCTL, &clkctl);
1221
1222        /* ok, now going to connect the chip with the clock source */
1223
1224        clkctl &= ~CLKCTL_CLKSTP;
1225        pci_write_config_byte(pdev, VLSI_PCI_CLKCTL, clkctl);
1226
1227        return 0;
1228}
1229
1230static void vlsi_stop_clock(struct pci_dev *pdev)
1231{
1232        u8      clkctl;
1233
1234        /* disconnect chip from clock source */
1235        pci_read_config_byte(pdev, VLSI_PCI_CLKCTL, &clkctl);
1236        clkctl |= CLKCTL_CLKSTP;
1237        pci_write_config_byte(pdev, VLSI_PCI_CLKCTL, clkctl);
1238
1239        /* disable all clock sources */
1240        clkctl &= ~(CLKCTL_EXTCLK | CLKCTL_PD_INV);
1241        pci_write_config_byte(pdev, VLSI_PCI_CLKCTL, clkctl);
1242}
1243
1244/********************************************************/
1245
1246/* writing all-zero to the VLSI PCI IO register area seems to prevent
1247 * some occasional situations where the hardware fails (symptoms are 
1248 * what appears as stalled tx/rx state machines, i.e. everything ok for
1249 * receive or transmit but hw makes no progress or is unable to access
1250 * the bus memory locations).
1251 * Best place to call this is immediately after/before the internal clock
1252 * gets started/stopped.
1253 */
1254
1255static inline void vlsi_clear_regs(unsigned iobase)
1256{
1257        unsigned        i;
1258        const unsigned  chip_io_extent = 32;
1259
1260        for (i = 0; i < chip_io_extent; i += sizeof(u16))
1261                outw(0, iobase + i);
1262}
1263
1264static int vlsi_init_chip(struct pci_dev *pdev)
1265{
1266        struct net_device *ndev = pci_get_drvdata(pdev);
1267        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1268        unsigned        iobase;
1269        u16 ptr;
1270
1271        /* start the clock and clean the registers */
1272
1273        if (vlsi_start_clock(pdev)) {
1274                IRDA_ERROR("%s: no valid clock source\n", __func__);
1275                return -1;
1276        }
1277        iobase = ndev->base_addr;
1278        vlsi_clear_regs(iobase);
1279
1280        outb(IRINTR_INT_MASK, iobase+VLSI_PIO_IRINTR); /* w/c pending IRQ, disable all INT */
1281
1282        outw(0, iobase+VLSI_PIO_IRENABLE);      /* disable IrPHY-interface */
1283
1284        /* disable everything, particularly IRCFG_MSTR - (also resetting the RING_PTR) */
1285
1286        outw(0, iobase+VLSI_PIO_IRCFG);
1287        wmb();
1288
1289        outw(MAX_PACKET_LENGTH, iobase+VLSI_PIO_MAXPKT);  /* max possible value=0x0fff */
1290
1291        outw(BUS_TO_RINGBASE(idev->busaddr), iobase+VLSI_PIO_RINGBASE);
1292
1293        outw(TX_RX_TO_RINGSIZE(idev->tx_ring->size, idev->rx_ring->size),
1294                iobase+VLSI_PIO_RINGSIZE);      
1295
1296        ptr = inw(iobase+VLSI_PIO_RINGPTR);
1297        atomic_set(&idev->rx_ring->head, RINGPTR_GET_RX(ptr));
1298        atomic_set(&idev->rx_ring->tail, RINGPTR_GET_RX(ptr));
1299        atomic_set(&idev->tx_ring->head, RINGPTR_GET_TX(ptr));
1300        atomic_set(&idev->tx_ring->tail, RINGPTR_GET_TX(ptr));
1301
1302        vlsi_set_baud(idev, iobase);    /* idev->new_baud used as provided by caller */
1303
1304        outb(IRINTR_INT_MASK, iobase+VLSI_PIO_IRINTR);  /* just in case - w/c pending IRQ's */
1305        wmb();
1306
1307        /* DO NOT BLINDLY ENABLE IRINTR_ACTEN!
1308         * basically every received pulse fires an ACTIVITY-INT
1309         * leading to >>1000 INT's per second instead of few 10
1310         */
1311
1312        outb(IRINTR_RPKTEN|IRINTR_TPKTEN, iobase+VLSI_PIO_IRINTR);
1313
1314        return 0;
1315}
1316
1317static int vlsi_start_hw(vlsi_irda_dev_t *idev)
1318{
1319        struct pci_dev *pdev = idev->pdev;
1320        struct net_device *ndev = pci_get_drvdata(pdev);
1321        unsigned iobase = ndev->base_addr;
1322        u8 byte;
1323
1324        /* we don't use the legacy UART, disable its address decoding */
1325
1326        pci_read_config_byte(pdev, VLSI_PCI_IRMISC, &byte);
1327        byte &= ~(IRMISC_UARTEN | IRMISC_UARTTST);
1328        pci_write_config_byte(pdev, VLSI_PCI_IRMISC, byte);
1329
1330        /* enable PCI busmaster access to our 16MB page */
1331
1332        pci_write_config_byte(pdev, VLSI_PCI_MSTRPAGE, MSTRPAGE_VALUE);
1333        pci_set_master(pdev);
1334
1335        if (vlsi_init_chip(pdev) < 0) {
1336                pci_disable_device(pdev);
1337                return -1;
1338        }
1339
1340        vlsi_fill_rx(idev->rx_ring);
1341
1342        do_gettimeofday(&idev->last_rx);        /* first mtt may start from now on */
1343
1344        outw(0, iobase+VLSI_PIO_PROMPT);        /* kick hw state machine */
1345
1346        return 0;
1347}
1348
1349static int vlsi_stop_hw(vlsi_irda_dev_t *idev)
1350{
1351        struct pci_dev *pdev = idev->pdev;
1352        struct net_device *ndev = pci_get_drvdata(pdev);
1353        unsigned iobase = ndev->base_addr;
1354        unsigned long flags;
1355
1356        spin_lock_irqsave(&idev->lock,flags);
1357        outw(0, iobase+VLSI_PIO_IRENABLE);
1358        outw(0, iobase+VLSI_PIO_IRCFG);                 /* disable everything */
1359
1360        /* disable and w/c irqs */
1361        outb(0, iobase+VLSI_PIO_IRINTR);
1362        wmb();
1363        outb(IRINTR_INT_MASK, iobase+VLSI_PIO_IRINTR);
1364        spin_unlock_irqrestore(&idev->lock,flags);
1365
1366        vlsi_unarm_tx(idev);
1367        vlsi_unarm_rx(idev);
1368
1369        vlsi_clear_regs(iobase);
1370        vlsi_stop_clock(pdev);
1371
1372        pci_disable_device(pdev);
1373
1374        return 0;
1375}
1376
1377/**************************************************************/
1378
1379static void vlsi_tx_timeout(struct net_device *ndev)
1380{
1381        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1382
1383
1384        vlsi_reg_debug(ndev->base_addr, __func__);
1385        vlsi_ring_debug(idev->tx_ring);
1386
1387        if (netif_running(ndev))
1388                netif_stop_queue(ndev);
1389
1390        vlsi_stop_hw(idev);
1391
1392        /* now simply restart the whole thing */
1393
1394        if (!idev->new_baud)
1395                idev->new_baud = idev->baud;            /* keep current baudrate */
1396
1397        if (vlsi_start_hw(idev))
1398                IRDA_ERROR("%s: failed to restart hw - %s(%s) unusable!\n",
1399                           __func__, pci_name(idev->pdev), ndev->name);
1400        else
1401                netif_start_queue(ndev);
1402}
1403
1404static int vlsi_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
1405{
1406        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1407        struct if_irda_req *irq = (struct if_irda_req *) rq;
1408        unsigned long flags;
1409        u16 fifocnt;
1410        int ret = 0;
1411
1412        switch (cmd) {
1413                case SIOCSBANDWIDTH:
1414                        if (!capable(CAP_NET_ADMIN)) {
1415                                ret = -EPERM;
1416                                break;
1417                        }
1418                        spin_lock_irqsave(&idev->lock, flags);
1419                        idev->new_baud = irq->ifr_baudrate;
1420                        /* when called from userland there might be a minor race window here
1421                         * if the stack tries to change speed concurrently - which would be
1422                         * pretty strange anyway with the userland having full control...
1423                         */
1424                        vlsi_set_baud(idev, ndev->base_addr);
1425                        spin_unlock_irqrestore(&idev->lock, flags);
1426                        break;
1427                case SIOCSMEDIABUSY:
1428                        if (!capable(CAP_NET_ADMIN)) {
1429                                ret = -EPERM;
1430                                break;
1431                        }
1432                        irda_device_set_media_busy(ndev, TRUE);
1433                        break;
1434                case SIOCGRECEIVING:
1435                        /* the best we can do: check whether there are any bytes in rx fifo.
1436                         * The trustable window (in case some data arrives just afterwards)
1437                         * may be as short as 1usec or so at 4Mbps.
1438                         */
1439                        fifocnt = inw(ndev->base_addr+VLSI_PIO_RCVBCNT) & RCVBCNT_MASK;
1440                        irq->ifr_receiving = (fifocnt!=0) ? 1 : 0;
1441                        break;
1442                default:
1443                        IRDA_WARNING("%s: notsupp - cmd=%04x\n",
1444                                     __func__, cmd);
1445                        ret = -EOPNOTSUPP;
1446        }       
1447        
1448        return ret;
1449}
1450
1451/********************************************************/
1452
1453static irqreturn_t vlsi_interrupt(int irq, void *dev_instance)
1454{
1455        struct net_device *ndev = dev_instance;
1456        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1457        unsigned        iobase;
1458        u8              irintr;
1459        int             boguscount = 5;
1460        unsigned long   flags;
1461        int             handled = 0;
1462
1463        iobase = ndev->base_addr;
1464        spin_lock_irqsave(&idev->lock,flags);
1465        do {
1466                irintr = inb(iobase+VLSI_PIO_IRINTR);
1467                mb();
1468                outb(irintr, iobase+VLSI_PIO_IRINTR);   /* acknowledge asap */
1469
1470                if (!(irintr&=IRINTR_INT_MASK))         /* not our INT - probably shared */
1471                        break;
1472
1473                handled = 1;
1474
1475                if (unlikely(!(irintr & ~IRINTR_ACTIVITY)))
1476                        break;                          /* nothing todo if only activity */
1477
1478                if (irintr&IRINTR_RPKTINT)
1479                        vlsi_rx_interrupt(ndev);
1480
1481                if (irintr&IRINTR_TPKTINT)
1482                        vlsi_tx_interrupt(ndev);
1483
1484        } while (--boguscount > 0);
1485        spin_unlock_irqrestore(&idev->lock,flags);
1486
1487        if (boguscount <= 0)
1488                IRDA_MESSAGE("%s: too much work in interrupt!\n",
1489                             __func__);
1490        return IRQ_RETVAL(handled);
1491}
1492
1493/********************************************************/
1494
1495static int vlsi_open(struct net_device *ndev)
1496{
1497        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1498        int     err = -EAGAIN;
1499        char    hwname[32];
1500
1501        if (pci_request_regions(idev->pdev, drivername)) {
1502                IRDA_WARNING("%s: io resource busy\n", __func__);
1503                goto errout;
1504        }
1505        ndev->base_addr = pci_resource_start(idev->pdev,0);
1506        ndev->irq = idev->pdev->irq;
1507
1508        /* under some rare occasions the chip apparently comes up with
1509         * IRQ's pending. We better w/c pending IRQ and disable them all
1510         */
1511
1512        outb(IRINTR_INT_MASK, ndev->base_addr+VLSI_PIO_IRINTR);
1513
1514        if (request_irq(ndev->irq, vlsi_interrupt, IRQF_SHARED,
1515                        drivername, ndev)) {
1516                IRDA_WARNING("%s: couldn't get IRQ: %d\n",
1517                             __func__, ndev->irq);
1518                goto errout_io;
1519        }
1520
1521        if ((err = vlsi_create_hwif(idev)) != 0)
1522                goto errout_irq;
1523
1524        sprintf(hwname, "VLSI-FIR @ 0x%04x", (unsigned)ndev->base_addr);
1525        idev->irlap = irlap_open(ndev,&idev->qos,hwname);
1526        if (!idev->irlap)
1527                goto errout_free_ring;
1528
1529        do_gettimeofday(&idev->last_rx);  /* first mtt may start from now on */
1530
1531        idev->new_baud = 9600;          /* start with IrPHY using 9600(SIR) mode */
1532
1533        if ((err = vlsi_start_hw(idev)) != 0)
1534                goto errout_close_irlap;
1535
1536        netif_start_queue(ndev);
1537
1538        IRDA_MESSAGE("%s: device %s operational\n", __func__, ndev->name);
1539
1540        return 0;
1541
1542errout_close_irlap:
1543        irlap_close(idev->irlap);
1544errout_free_ring:
1545        vlsi_destroy_hwif(idev);
1546errout_irq:
1547        free_irq(ndev->irq,ndev);
1548errout_io:
1549        pci_release_regions(idev->pdev);
1550errout:
1551        return err;
1552}
1553
1554static int vlsi_close(struct net_device *ndev)
1555{
1556        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1557
1558        netif_stop_queue(ndev);
1559
1560        if (idev->irlap)
1561                irlap_close(idev->irlap);
1562        idev->irlap = NULL;
1563
1564        vlsi_stop_hw(idev);
1565
1566        vlsi_destroy_hwif(idev);
1567
1568        free_irq(ndev->irq,ndev);
1569
1570        pci_release_regions(idev->pdev);
1571
1572        IRDA_MESSAGE("%s: device %s stopped\n", __func__, ndev->name);
1573
1574        return 0;
1575}
1576
1577static const struct net_device_ops vlsi_netdev_ops = {
1578        .ndo_open       = vlsi_open,
1579        .ndo_stop       = vlsi_close,
1580        .ndo_start_xmit = vlsi_hard_start_xmit,
1581        .ndo_do_ioctl   = vlsi_ioctl,
1582        .ndo_tx_timeout = vlsi_tx_timeout,
1583};
1584
1585static int vlsi_irda_init(struct net_device *ndev)
1586{
1587        vlsi_irda_dev_t *idev = netdev_priv(ndev);
1588        struct pci_dev *pdev = idev->pdev;
1589
1590        ndev->irq = pdev->irq;
1591        ndev->base_addr = pci_resource_start(pdev,0);
1592
1593        /* PCI busmastering
1594         * see include file for details why we need these 2 masks, in this order!
1595         */
1596
1597        if (pci_set_dma_mask(pdev,DMA_MASK_USED_BY_HW) ||
1598            pci_set_dma_mask(pdev,DMA_MASK_MSTRPAGE)) {
1599                IRDA_ERROR("%s: aborting due to PCI BM-DMA address limitations\n", __func__);
1600                return -1;
1601        }
1602
1603        irda_init_max_qos_capabilies(&idev->qos);
1604
1605        /* the VLSI82C147 does not support 576000! */
1606
1607        idev->qos.baud_rate.bits = IR_2400 | IR_9600
1608                | IR_19200 | IR_38400 | IR_57600 | IR_115200
1609                | IR_1152000 | (IR_4000000 << 8);
1610
1611        idev->qos.min_turn_time.bits = qos_mtt_bits;
1612
1613        irda_qos_bits_to_value(&idev->qos);
1614
1615        /* currently no public media definitions for IrDA */
1616
1617        ndev->flags |= IFF_PORTSEL | IFF_AUTOMEDIA;
1618        ndev->if_port = IF_PORT_UNKNOWN;
1619 
1620        ndev->netdev_ops = &vlsi_netdev_ops;
1621        ndev->watchdog_timeo  = 500*HZ/1000;    /* max. allowed turn time for IrLAP */
1622
1623        SET_NETDEV_DEV(ndev, &pdev->dev);
1624
1625        return 0;
1626}       
1627
1628/**************************************************************/
1629
1630static int __devinit
1631vlsi_irda_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1632{
1633        struct net_device       *ndev;
1634        vlsi_irda_dev_t         *idev;
1635
1636        if (pci_enable_device(pdev))
1637                goto out;
1638        else
1639                pdev->current_state = 0; /* hw must be running now */
1640
1641        IRDA_MESSAGE("%s: IrDA PCI controller %s detected\n",
1642                     drivername, pci_name(pdev));
1643
1644        if ( !pci_resource_start(pdev,0) ||
1645             !(pci_resource_flags(pdev,0) & IORESOURCE_IO) ) {
1646                IRDA_ERROR("%s: bar 0 invalid", __func__);
1647                goto out_disable;
1648        }
1649
1650        ndev = alloc_irdadev(sizeof(*idev));
1651        if (ndev==NULL) {
1652                IRDA_ERROR("%s: Unable to allocate device memory.\n",
1653                           __func__);
1654                goto out_disable;
1655        }
1656
1657        idev = netdev_priv(ndev);
1658
1659        spin_lock_init(&idev->lock);
1660        mutex_init(&idev->mtx);
1661        mutex_lock(&idev->mtx);
1662        idev->pdev = pdev;
1663
1664        if (vlsi_irda_init(ndev) < 0)
1665                goto out_freedev;
1666
1667        if (register_netdev(ndev) < 0) {
1668                IRDA_ERROR("%s: register_netdev failed\n", __func__);
1669                goto out_freedev;
1670        }
1671
1672        if (vlsi_proc_root != NULL) {
1673                struct proc_dir_entry *ent;
1674
1675                ent = proc_create_data(ndev->name, S_IFREG|S_IRUGO,
1676                                       vlsi_proc_root, VLSI_PROC_FOPS, ndev);
1677                if (!ent) {
1678                        IRDA_WARNING("%s: failed to create proc entry\n",
1679                                     __func__);
1680                } else {
1681                        ent->size = 0;
1682                }
1683                idev->proc_entry = ent;
1684        }
1685        IRDA_MESSAGE("%s: registered device %s\n", drivername, ndev->name);
1686
1687        pci_set_drvdata(pdev, ndev);
1688        mutex_unlock(&idev->mtx);
1689
1690        return 0;
1691
1692out_freedev:
1693        mutex_unlock(&idev->mtx);
1694        free_netdev(ndev);
1695out_disable:
1696        pci_disable_device(pdev);
1697out:
1698        pci_set_drvdata(pdev, NULL);
1699        return -ENODEV;
1700}
1701
1702static void __devexit vlsi_irda_remove(struct pci_dev *pdev)
1703{
1704        struct net_device *ndev = pci_get_drvdata(pdev);
1705        vlsi_irda_dev_t *idev;
1706
1707        if (!ndev) {
1708                IRDA_ERROR("%s: lost netdevice?\n", drivername);
1709                return;
1710        }
1711
1712        unregister_netdev(ndev);
1713
1714        idev = netdev_priv(ndev);
1715        mutex_lock(&idev->mtx);
1716        if (idev->proc_entry) {
1717                remove_proc_entry(ndev->name, vlsi_proc_root);
1718                idev->proc_entry = NULL;
1719        }
1720        mutex_unlock(&idev->mtx);
1721
1722        free_netdev(ndev);
1723
1724        pci_set_drvdata(pdev, NULL);
1725
1726        IRDA_MESSAGE("%s: %s removed\n", drivername, pci_name(pdev));
1727}
1728
1729#ifdef CONFIG_PM
1730
1731/* The Controller doesn't provide PCI PM capabilities as defined by PCI specs.
1732 * Some of the Linux PCI-PM code however depends on this, for example in
1733 * pci_set_power_state(). So we have to take care to perform the required
1734 * operations on our own (particularly reflecting the pdev->current_state)
1735 * otherwise we might get cheated by pci-pm.
1736 */
1737
1738
1739static int vlsi_irda_suspend(struct pci_dev *pdev, pm_message_t state)
1740{
1741        struct net_device *ndev = pci_get_drvdata(pdev);
1742        vlsi_irda_dev_t *idev;
1743
1744        if (!ndev) {
1745                IRDA_ERROR("%s - %s: no netdevice\n",
1746                           __func__, pci_name(pdev));
1747                return 0;
1748        }
1749        idev = netdev_priv(ndev);
1750        mutex_lock(&idev->mtx);
1751        if (pdev->current_state != 0) {                 /* already suspended */
1752                if (state.event > pdev->current_state) {        /* simply go deeper */
1753                        pci_set_power_state(pdev, pci_choose_state(pdev, state));
1754                        pdev->current_state = state.event;
1755                }
1756                else
1757                        IRDA_ERROR("%s - %s: invalid suspend request %u -> %u\n", __func__, pci_name(pdev), pdev->current_state, state.event);
1758                mutex_unlock(&idev->mtx);
1759                return 0;
1760        }
1761
1762        if (netif_running(ndev)) {
1763                netif_device_detach(ndev);
1764                vlsi_stop_hw(idev);
1765                pci_save_state(pdev);
1766                if (!idev->new_baud)
1767                        /* remember speed settings to restore on resume */
1768                        idev->new_baud = idev->baud;
1769        }
1770
1771        pci_set_power_state(pdev, pci_choose_state(pdev, state));
1772        pdev->current_state = state.event;
1773        idev->resume_ok = 1;
1774        mutex_unlock(&idev->mtx);
1775        return 0;
1776}
1777
1778static int vlsi_irda_resume(struct pci_dev *pdev)
1779{
1780        struct net_device *ndev = pci_get_drvdata(pdev);
1781        vlsi_irda_dev_t *idev;
1782
1783        if (!ndev) {
1784                IRDA_ERROR("%s - %s: no netdevice\n",
1785                           __func__, pci_name(pdev));
1786                return 0;
1787        }
1788        idev = netdev_priv(ndev);
1789        mutex_lock(&idev->mtx);
1790        if (pdev->current_state == 0) {
1791                mutex_unlock(&idev->mtx);
1792                IRDA_WARNING("%s - %s: already resumed\n",
1793                             __func__, pci_name(pdev));
1794                return 0;
1795        }
1796        
1797        pci_set_power_state(pdev, PCI_D0);
1798        pdev->current_state = PM_EVENT_ON;
1799
1800        if (!idev->resume_ok) {
1801                /* should be obsolete now - but used to happen due to:
1802                 * - pci layer initially setting pdev->current_state = 4 (unknown)
1803                 * - pci layer did not walk the save_state-tree (might be APM problem)
1804                 *   so we could not refuse to suspend from undefined state
1805                 * - vlsi_irda_suspend detected invalid state and refused to save
1806                 *   configuration for resume - but was too late to stop suspending
1807                 * - vlsi_irda_resume got screwed when trying to resume from garbage
1808                 *
1809                 * now we explicitly set pdev->current_state = 0 after enabling the
1810                 * device and independently resume_ok should catch any garbage config.
1811                 */
1812                IRDA_WARNING("%s - hm, nothing to resume?\n", __func__);
1813                mutex_unlock(&idev->mtx);
1814                return 0;
1815        }
1816
1817        if (netif_running(ndev)) {
1818                pci_restore_state(pdev);
1819                vlsi_start_hw(idev);
1820                netif_device_attach(ndev);
1821        }
1822        idev->resume_ok = 0;
1823        mutex_unlock(&idev->mtx);
1824        return 0;
1825}
1826
1827#endif /* CONFIG_PM */
1828
1829/*********************************************************/
1830
1831static struct pci_driver vlsi_irda_driver = {
1832        .name           = drivername,
1833        .id_table       = vlsi_irda_table,
1834        .probe          = vlsi_irda_probe,
1835        .remove         = __devexit_p(vlsi_irda_remove),
1836#ifdef CONFIG_PM
1837        .suspend        = vlsi_irda_suspend,
1838        .resume         = vlsi_irda_resume,
1839#endif
1840};
1841
1842#define PROC_DIR ("driver/" DRIVER_NAME)
1843
1844static int __init vlsi_mod_init(void)
1845{
1846        int     i, ret;
1847
1848        if (clksrc < 0  ||  clksrc > 3) {
1849                IRDA_ERROR("%s: invalid clksrc=%d\n", drivername, clksrc);
1850                return -1;
1851        }
1852
1853        for (i = 0; i < 2; i++) {
1854                switch(ringsize[i]) {
1855                        case 4:
1856                        case 8:
1857                        case 16:
1858                        case 32:
1859                        case 64:
1860                                break;
1861                        default:
1862                                IRDA_WARNING("%s: invalid %s ringsize %d, using default=8", drivername, (i)?"rx":"tx", ringsize[i]);
1863                                ringsize[i] = 8;
1864                                break;
1865                }
1866        } 
1867
1868        sirpulse = !!sirpulse;
1869
1870        /* proc_mkdir returns NULL if !CONFIG_PROC_FS.
1871         * Failure to create the procfs entry is handled like running
1872         * without procfs - it's not required for the driver to work.
1873         */
1874        vlsi_proc_root = proc_mkdir(PROC_DIR, NULL);
1875
1876        ret = pci_register_driver(&vlsi_irda_driver);
1877
1878        if (ret && vlsi_proc_root)
1879                remove_proc_entry(PROC_DIR, NULL);
1880        return ret;
1881
1882}
1883
1884static void __exit vlsi_mod_exit(void)
1885{
1886        pci_unregister_driver(&vlsi_irda_driver);
1887        if (vlsi_proc_root)
1888                remove_proc_entry(PROC_DIR, NULL);
1889}
1890
1891module_init(vlsi_mod_init);
1892module_exit(vlsi_mod_exit);
1893