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hwmon: (max6650) Add support for alarms
[deliverable/linux.git] / drivers / net / wireless / prism54 / islpci_eth.c
1 /*
2 * Copyright (C) 2002 Intersil Americas Inc.
3 * Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 */
18
19 #include <linux/module.h>
20
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/if_arp.h>
26 #include <asm/byteorder.h>
27
28 #include "prismcompat.h"
29 #include "isl_38xx.h"
30 #include "islpci_eth.h"
31 #include "islpci_mgt.h"
32 #include "oid_mgt.h"
33
34 /******************************************************************************
35 Network Interface functions
36 ******************************************************************************/
37 void
38 islpci_eth_cleanup_transmit(islpci_private *priv,
39 isl38xx_control_block *control_block)
40 {
41 struct sk_buff *skb;
42 u32 index;
43
44 /* compare the control block read pointer with the free pointer */
45 while (priv->free_data_tx !=
46 le32_to_cpu(control_block->
47 device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) {
48 /* read the index of the first fragment to be freed */
49 index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE;
50
51 /* check for holes in the arrays caused by multi fragment frames
52 * searching for the last fragment of a frame */
53 if (priv->pci_map_tx_address[index] != (dma_addr_t) NULL) {
54 /* entry is the last fragment of a frame
55 * free the skb structure and unmap pci memory */
56 skb = priv->data_low_tx[index];
57
58 #if VERBOSE > SHOW_ERROR_MESSAGES
59 DEBUG(SHOW_TRACING,
60 "cleanup skb %p skb->data %p skb->len %u truesize %u\n ",
61 skb, skb->data, skb->len, skb->truesize);
62 #endif
63
64 pci_unmap_single(priv->pdev,
65 priv->pci_map_tx_address[index],
66 skb->len, PCI_DMA_TODEVICE);
67 dev_kfree_skb_irq(skb);
68 skb = NULL;
69 }
70 /* increment the free data low queue pointer */
71 priv->free_data_tx++;
72 }
73 }
74
75 int
76 islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev)
77 {
78 islpci_private *priv = netdev_priv(ndev);
79 isl38xx_control_block *cb = priv->control_block;
80 u32 index;
81 dma_addr_t pci_map_address;
82 int frame_size;
83 isl38xx_fragment *fragment;
84 int offset;
85 struct sk_buff *newskb;
86 int newskb_offset;
87 unsigned long flags;
88 unsigned char wds_mac[6];
89 u32 curr_frag;
90 int err = 0;
91
92 #if VERBOSE > SHOW_ERROR_MESSAGES
93 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n");
94 #endif
95
96 /* lock the driver code */
97 spin_lock_irqsave(&priv->slock, flags);
98
99 /* check whether the destination queue has enough fragments for the frame */
100 curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]);
101 if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) {
102 printk(KERN_ERR "%s: transmit device queue full when awake\n",
103 ndev->name);
104 netif_stop_queue(ndev);
105
106 /* trigger the device */
107 isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE,
108 ISL38XX_DEV_INT_REG);
109 udelay(ISL38XX_WRITEIO_DELAY);
110
111 err = -EBUSY;
112 goto drop_free;
113 }
114 /* Check alignment and WDS frame formatting. The start of the packet should
115 * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes
116 * and add WDS address information */
117 if (likely(((long) skb->data & 0x03) | init_wds)) {
118 /* get the number of bytes to add and re-allign */
119 offset = (4 - (long) skb->data) & 0x03;
120 offset += init_wds ? 6 : 0;
121
122 /* check whether the current skb can be used */
123 if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
124 unsigned char *src = skb->data;
125
126 #if VERBOSE > SHOW_ERROR_MESSAGES
127 DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset,
128 init_wds);
129 #endif
130
131 /* align the buffer on 4-byte boundary */
132 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
133 if (init_wds) {
134 /* wds requires an additional address field of 6 bytes */
135 skb_put(skb, 6);
136 #ifdef ISLPCI_ETH_DEBUG
137 printk("islpci_eth_transmit:wds_mac\n");
138 #endif
139 memmove(skb->data + 6, src, skb->len);
140 skb_copy_to_linear_data(skb, wds_mac, 6);
141 } else {
142 memmove(skb->data, src, skb->len);
143 }
144
145 #if VERBOSE > SHOW_ERROR_MESSAGES
146 DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data,
147 src, skb->len);
148 #endif
149 } else {
150 newskb =
151 dev_alloc_skb(init_wds ? skb->len + 6 : skb->len);
152 if (unlikely(newskb == NULL)) {
153 printk(KERN_ERR "%s: Cannot allocate skb\n",
154 ndev->name);
155 err = -ENOMEM;
156 goto drop_free;
157 }
158 newskb_offset = (4 - (long) newskb->data) & 0x03;
159
160 /* Check if newskb->data is aligned */
161 if (newskb_offset)
162 skb_reserve(newskb, newskb_offset);
163
164 skb_put(newskb, init_wds ? skb->len + 6 : skb->len);
165 if (init_wds) {
166 skb_copy_from_linear_data(skb,
167 newskb->data + 6,
168 skb->len);
169 skb_copy_to_linear_data(newskb, wds_mac, 6);
170 #ifdef ISLPCI_ETH_DEBUG
171 printk("islpci_eth_transmit:wds_mac\n");
172 #endif
173 } else
174 skb_copy_from_linear_data(skb, newskb->data,
175 skb->len);
176
177 #if VERBOSE > SHOW_ERROR_MESSAGES
178 DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n",
179 newskb->data, skb->data, skb->len, init_wds);
180 #endif
181
182 newskb->dev = skb->dev;
183 dev_kfree_skb_irq(skb);
184 skb = newskb;
185 }
186 }
187 /* display the buffer contents for debugging */
188 #if VERBOSE > SHOW_ERROR_MESSAGES
189 DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data);
190 display_buffer((char *) skb->data, skb->len);
191 #endif
192
193 /* map the skb buffer to pci memory for DMA operation */
194 pci_map_address = pci_map_single(priv->pdev,
195 (void *) skb->data, skb->len,
196 PCI_DMA_TODEVICE);
197 if (unlikely(pci_map_address == 0)) {
198 printk(KERN_WARNING "%s: cannot map buffer to PCI\n",
199 ndev->name);
200
201 err = -EIO;
202 goto drop_free;
203 }
204 /* Place the fragment in the control block structure. */
205 index = curr_frag % ISL38XX_CB_TX_QSIZE;
206 fragment = &cb->tx_data_low[index];
207
208 priv->pci_map_tx_address[index] = pci_map_address;
209 /* store the skb address for future freeing */
210 priv->data_low_tx[index] = skb;
211 /* set the proper fragment start address and size information */
212 frame_size = skb->len;
213 fragment->size = cpu_to_le16(frame_size);
214 fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */
215 fragment->address = cpu_to_le32(pci_map_address);
216 curr_frag++;
217
218 /* The fragment address in the control block must have been
219 * written before announcing the frame buffer to device. */
220 wmb();
221 cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag);
222
223 if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD
224 > ISL38XX_CB_TX_QSIZE) {
225 /* stop sends from upper layers */
226 netif_stop_queue(ndev);
227
228 /* set the full flag for the transmission queue */
229 priv->data_low_tx_full = 1;
230 }
231
232 /* set the transmission time */
233 ndev->trans_start = jiffies;
234 ndev->stats.tx_packets++;
235 ndev->stats.tx_bytes += skb->len;
236
237 /* trigger the device */
238 islpci_trigger(priv);
239
240 /* unlock the driver code */
241 spin_unlock_irqrestore(&priv->slock, flags);
242
243 return 0;
244
245 drop_free:
246 ndev->stats.tx_dropped++;
247 spin_unlock_irqrestore(&priv->slock, flags);
248 dev_kfree_skb(skb);
249 return err;
250 }
251
252 static inline int
253 islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb)
254 {
255 /* The card reports full 802.11 packets but with a 20 bytes
256 * header and without the FCS. But there a is a bit that
257 * indicates if the packet is corrupted :-) */
258 struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data;
259
260 if (hdr->flags & 0x01)
261 /* This one is bad. Drop it ! */
262 return -1;
263 if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) {
264 struct avs_80211_1_header *avs;
265 /* extract the relevant data from the header */
266 u32 clock = le32_to_cpu(hdr->clock);
267 u8 rate = hdr->rate;
268 u16 freq = le16_to_cpu(hdr->freq);
269 u8 rssi = hdr->rssi;
270
271 skb_pull(*skb, sizeof (struct rfmon_header));
272
273 if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) {
274 struct sk_buff *newskb = skb_copy_expand(*skb,
275 sizeof (struct
276 avs_80211_1_header),
277 0, GFP_ATOMIC);
278 if (newskb) {
279 dev_kfree_skb_irq(*skb);
280 *skb = newskb;
281 } else
282 return -1;
283 /* This behavior is not very subtile... */
284 }
285
286 /* make room for the new header and fill it. */
287 avs =
288 (struct avs_80211_1_header *) skb_push(*skb,
289 sizeof (struct
290 avs_80211_1_header));
291
292 avs->version = cpu_to_be32(P80211CAPTURE_VERSION);
293 avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header));
294 avs->mactime = cpu_to_be64(clock);
295 avs->hosttime = cpu_to_be64(jiffies);
296 avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */
297 avs->channel = cpu_to_be32(channel_of_freq(freq));
298 avs->datarate = cpu_to_be32(rate * 5);
299 avs->antenna = cpu_to_be32(0); /*unknown */
300 avs->priority = cpu_to_be32(0); /*unknown */
301 avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */
302 avs->ssi_signal = cpu_to_be32(rssi & 0x7f);
303 avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */
304 avs->preamble = cpu_to_be32(0); /*unknown */
305 avs->encoding = cpu_to_be32(0); /*unknown */
306 } else
307 skb_pull(*skb, sizeof (struct rfmon_header));
308
309 (*skb)->protocol = htons(ETH_P_802_2);
310 skb_reset_mac_header(*skb);
311 (*skb)->pkt_type = PACKET_OTHERHOST;
312
313 return 0;
314 }
315
316 int
317 islpci_eth_receive(islpci_private *priv)
318 {
319 struct net_device *ndev = priv->ndev;
320 isl38xx_control_block *control_block = priv->control_block;
321 struct sk_buff *skb;
322 u16 size;
323 u32 index, offset;
324 unsigned char *src;
325 int discard = 0;
326
327 #if VERBOSE > SHOW_ERROR_MESSAGES
328 DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n");
329 #endif
330
331 /* the device has written an Ethernet frame in the data area
332 * of the sk_buff without updating the structure, do it now */
333 index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE;
334 size = le16_to_cpu(control_block->rx_data_low[index].size);
335 skb = priv->data_low_rx[index];
336 offset = ((unsigned long)
337 le32_to_cpu(control_block->rx_data_low[index].address) -
338 (unsigned long) skb->data) & 3;
339
340 #if VERBOSE > SHOW_ERROR_MESSAGES
341 DEBUG(SHOW_TRACING,
342 "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ",
343 control_block->rx_data_low[priv->free_data_rx].address, skb->data,
344 skb->len, offset, skb->truesize);
345 #endif
346
347 /* delete the streaming DMA mapping before processing the skb */
348 pci_unmap_single(priv->pdev,
349 priv->pci_map_rx_address[index],
350 MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE);
351
352 /* update the skb structure and allign the buffer */
353 skb_put(skb, size);
354 if (offset) {
355 /* shift the buffer allocation offset bytes to get the right frame */
356 skb_pull(skb, 2);
357 skb_put(skb, 2);
358 }
359 #if VERBOSE > SHOW_ERROR_MESSAGES
360 /* display the buffer contents for debugging */
361 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
362 display_buffer((char *) skb->data, skb->len);
363 #endif
364
365 /* check whether WDS is enabled and whether the data frame is a WDS frame */
366
367 if (init_wds) {
368 /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */
369 src = skb->data + 6;
370 memmove(skb->data, src, skb->len - 6);
371 skb_trim(skb, skb->len - 6);
372 }
373 #if VERBOSE > SHOW_ERROR_MESSAGES
374 DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb);
375 DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len);
376
377 /* display the buffer contents for debugging */
378 DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data);
379 display_buffer((char *) skb->data, skb->len);
380 #endif
381 /* take care of monitor mode and spy monitoring. */
382 if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {
383 skb->dev = ndev;
384 discard = islpci_monitor_rx(priv, &skb);
385 } else {
386 if (unlikely(skb->data[2 * ETH_ALEN] == 0)) {
387 /* The packet has a rx_annex. Read it for spy monitoring, Then
388 * remove it, while keeping the 2 leading MAC addr.
389 */
390 struct iw_quality wstats;
391 struct rx_annex_header *annex =
392 (struct rx_annex_header *) skb->data;
393 wstats.level = annex->rfmon.rssi;
394 /* The noise value can be a bit outdated if nobody's
395 * reading wireless stats... */
396 wstats.noise = priv->local_iwstatistics.qual.noise;
397 wstats.qual = wstats.level - wstats.noise;
398 wstats.updated = 0x07;
399 /* Update spy records */
400 wireless_spy_update(ndev, annex->addr2, &wstats);
401
402 skb_copy_from_linear_data(skb,
403 (skb->data +
404 sizeof(struct rfmon_header)),
405 2 * ETH_ALEN);
406 skb_pull(skb, sizeof (struct rfmon_header));
407 }
408 skb->protocol = eth_type_trans(skb, ndev);
409 }
410 skb->ip_summed = CHECKSUM_NONE;
411 ndev->stats.rx_packets++;
412 ndev->stats.rx_bytes += size;
413
414 /* deliver the skb to the network layer */
415 #ifdef ISLPCI_ETH_DEBUG
416 printk
417 ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
418 skb->data[0], skb->data[1], skb->data[2], skb->data[3],
419 skb->data[4], skb->data[5]);
420 #endif
421 if (unlikely(discard)) {
422 dev_kfree_skb_irq(skb);
423 skb = NULL;
424 } else
425 netif_rx(skb);
426
427 /* increment the read index for the rx data low queue */
428 priv->free_data_rx++;
429
430 /* add one or more sk_buff structures */
431 while (index =
432 le32_to_cpu(control_block->
433 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]),
434 index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) {
435 /* allocate an sk_buff for received data frames storage
436 * include any required allignment operations */
437 skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2);
438 if (unlikely(skb == NULL)) {
439 /* error allocating an sk_buff structure elements */
440 DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n");
441 break;
442 }
443 skb_reserve(skb, (4 - (long) skb->data) & 0x03);
444 /* store the new skb structure pointer */
445 index = index % ISL38XX_CB_RX_QSIZE;
446 priv->data_low_rx[index] = skb;
447
448 #if VERBOSE > SHOW_ERROR_MESSAGES
449 DEBUG(SHOW_TRACING,
450 "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ",
451 skb, skb->data, skb->len, index, skb->truesize);
452 #endif
453
454 /* set the streaming DMA mapping for proper PCI bus operation */
455 priv->pci_map_rx_address[index] =
456 pci_map_single(priv->pdev, (void *) skb->data,
457 MAX_FRAGMENT_SIZE_RX + 2,
458 PCI_DMA_FROMDEVICE);
459 if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) {
460 /* error mapping the buffer to device accessable memory address */
461 DEBUG(SHOW_ERROR_MESSAGES,
462 "Error mapping DMA address\n");
463
464 /* free the skbuf structure before aborting */
465 dev_kfree_skb_irq((struct sk_buff *) skb);
466 skb = NULL;
467 break;
468 }
469 /* update the fragment address */
470 control_block->rx_data_low[index].address =
471 cpu_to_le32((u32)priv->pci_map_rx_address[index]);
472 wmb();
473
474 /* increment the driver read pointer */
475 le32_add_cpu(&control_block->
476 driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1);
477 }
478
479 /* trigger the device */
480 islpci_trigger(priv);
481
482 return 0;
483 }
484
485 void
486 islpci_do_reset_and_wake(struct work_struct *work)
487 {
488 islpci_private *priv = container_of(work, islpci_private, reset_task);
489
490 islpci_reset(priv, 1);
491 priv->reset_task_pending = 0;
492 smp_wmb();
493 netif_wake_queue(priv->ndev);
494 }
495
496 void
497 islpci_eth_tx_timeout(struct net_device *ndev)
498 {
499 islpci_private *priv = netdev_priv(ndev);
500
501 /* increment the transmit error counter */
502 ndev->stats.tx_errors++;
503
504 if (!priv->reset_task_pending) {
505 printk(KERN_WARNING
506 "%s: tx_timeout, scheduling reset", ndev->name);
507 netif_stop_queue(ndev);
508 priv->reset_task_pending = 1;
509 schedule_work(&priv->reset_task);
510 } else {
511 printk(KERN_WARNING
512 "%s: tx_timeout, waiting for reset", ndev->name);
513 }
514 }
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