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vlsi_ir.c
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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 <[email protected]>"
30 
31 MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
32 MODULE_AUTHOR(DRIVER_AUTHOR);
33 MODULE_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 
61 static /* const */ char drivername[] = DRIVER_NAME;
62 
63 static 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 
75 MODULE_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 
86 static int clksrc = 0; /* default is 0(auto) */
87 module_param(clksrc, int, 0);
88 MODULE_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 
98 static int ringsize[] = {8,8}; /* default is tx=8 / rx=8 */
99 module_param_array(ringsize, int, NULL, 0);
100 MODULE_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 
111 static int sirpulse = 1; /* default is 3/16 bittime */
112 module_param(sirpulse, int, 0);
113 MODULE_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 
122 static int qos_mtt_bits = 0x07; /* default is 1 ms or more */
123 module_param(qos_mtt_bits, int, 0);
124 MODULE_PARM_DESC(qos_mtt_bits, "IrLAP bitfield representing min-turn-time");
125 
126 /********************************************************/
127 
128 static 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 
138 static 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 */
160 static struct proc_dir_entry *vlsi_proc_root = NULL;
161 
162 #ifdef CONFIG_PROC_FS
163 
164 static 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 
180 static 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 
306 static 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 
347 static 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 
384 static int vlsi_seq_open(struct inode *inode, struct file *file)
385 {
386  return single_open(file, vlsi_seq_show, PDE(inode)->data);
387 }
388 
389 static 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 
405 static 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 
462 static 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 
482 static 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 
513 out_free_rx:
514  vlsi_free_ring(idev->rx_ring);
515 out_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;
519 out:
520  return -ENOMEM;
521 }
522 
523 static 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 
540 static 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 
605 done:
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 
613 static 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 
639 static 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 
688 static 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 
737 static 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 
766 static 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 
858 static 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 
1050 drop_unlock:
1051  spin_unlock_irqrestore(&idev->lock, flags);
1052 drop:
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 
1065 static 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 
1125 static 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 
1167 static 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 
1230 static 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 
1255 static 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 
1264 static 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 
1317 static 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 
1349 static 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 
1379 static 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 
1404 static 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 
1453 static 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 
1495 static 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 
1542 errout_close_irlap:
1543  irlap_close(idev->irlap);
1544 errout_free_ring:
1545  vlsi_destroy_hwif(idev);
1546 errout_irq:
1547  free_irq(ndev->irq,ndev);
1548 errout_io:
1549  pci_release_regions(idev->pdev);
1550 errout:
1551  return err;
1552 }
1553 
1554 static 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 
1577 static 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 
1585 static 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 
1630 static int __devinit
1631 vlsi_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 
1692 out_freedev:
1693  mutex_unlock(&idev->mtx);
1694  free_netdev(ndev);
1695 out_disable:
1696  pci_disable_device(pdev);
1697 out:
1698  pci_set_drvdata(pdev, NULL);
1699  return -ENODEV;
1700 }
1701 
1702 static 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 
1739 static 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 
1778 static 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 
1831 static 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 
1844 static 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 
1884 static 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 
1891 module_init(vlsi_mod_init);
1892 module_exit(vlsi_mod_exit);
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