Merge branch 'upstream-next' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6.git] / drivers / net / wireless / rt2x00 / rt2x00pci.c
1 /*
2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3         <http://rt2x00.serialmonkey.com>
4
5         This program is free software; you can redistribute it and/or modify
6         it under the terms of the GNU General Public License as published by
7         the Free Software Foundation; either version 2 of the License, or
8         (at your option) any later version.
9
10         This program is distributed in the hope that it will be useful,
11         but WITHOUT ANY WARRANTY; without even the implied warranty of
12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13         GNU General Public License for more details.
14
15         You should have received a copy of the GNU General Public License
16         along with this program; if not, write to the
17         Free Software Foundation, Inc.,
18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 /*
22         Module: rt2x00pci
23         Abstract: rt2x00 generic pci device routines.
24  */
25
26 #include <linux/dma-mapping.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30
31 #include "rt2x00.h"
32 #include "rt2x00pci.h"
33
34 /*
35  * TX data handlers.
36  */
37 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
38                             struct data_queue *queue, struct sk_buff *skb,
39                             struct ieee80211_tx_control *control)
40 {
41         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
42         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
43         struct skb_frame_desc *skbdesc;
44         u32 word;
45
46         if (rt2x00queue_full(queue))
47                 return -EINVAL;
48
49         rt2x00_desc_read(priv_tx->desc, 0, &word);
50
51         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
52             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
53                 ERROR(rt2x00dev,
54                       "Arrived at non-free entry in the non-full queue %d.\n"
55                       "Please file bug report to %s.\n",
56                       entry->queue->qid, DRV_PROJECT);
57                 return -EINVAL;
58         }
59
60         /*
61          * Fill in skb descriptor
62          */
63         skbdesc = get_skb_frame_desc(skb);
64         skbdesc->data = skb->data;
65         skbdesc->data_len = skb->len;
66         skbdesc->desc = priv_tx->desc;
67         skbdesc->desc_len = queue->desc_size;
68         skbdesc->entry = entry;
69
70         memcpy(&priv_tx->control, control, sizeof(priv_tx->control));
71         memcpy(priv_tx->data, skb->data, skb->len);
72         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
73
74         rt2x00queue_index_inc(queue, Q_INDEX);
75
76         return 0;
77 }
78 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
79
80 /*
81  * TX/RX data handlers.
82  */
83 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
84 {
85         struct data_queue *queue = rt2x00dev->rx;
86         struct queue_entry *entry;
87         struct queue_entry_priv_pci_rx *priv_rx;
88         struct ieee80211_hdr *hdr;
89         struct skb_frame_desc *skbdesc;
90         struct rxdone_entry_desc rxdesc;
91         int header_size;
92         int align;
93         u32 word;
94
95         while (1) {
96                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
97                 priv_rx = entry->priv_data;
98                 rt2x00_desc_read(priv_rx->desc, 0, &word);
99
100                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
101                         break;
102
103                 memset(&rxdesc, 0, sizeof(rxdesc));
104                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
105
106                 hdr = (struct ieee80211_hdr *)priv_rx->data;
107                 header_size =
108                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
109
110                 /*
111                  * The data behind the ieee80211 header must be
112                  * aligned on a 4 byte boundary.
113                  */
114                 align = header_size % 4;
115
116                 /*
117                  * Allocate the sk_buffer, initialize it and copy
118                  * all data into it.
119                  */
120                 entry->skb = dev_alloc_skb(rxdesc.size + align);
121                 if (!entry->skb)
122                         return;
123
124                 skb_reserve(entry->skb, align);
125                 memcpy(skb_put(entry->skb, rxdesc.size),
126                        priv_rx->data, rxdesc.size);
127
128                 /*
129                  * Fill in skb descriptor
130                  */
131                 skbdesc = get_skb_frame_desc(entry->skb);
132                 memset(skbdesc, 0, sizeof(*skbdesc));
133                 skbdesc->data = entry->skb->data;
134                 skbdesc->data_len = entry->skb->len;
135                 skbdesc->desc = priv_rx->desc;
136                 skbdesc->desc_len = queue->desc_size;
137                 skbdesc->entry = entry;
138
139                 /*
140                  * Send the frame to rt2x00lib for further processing.
141                  */
142                 rt2x00lib_rxdone(entry, &rxdesc);
143
144                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
145                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
146                         rt2x00_desc_write(priv_rx->desc, 0, word);
147                 }
148
149                 rt2x00queue_index_inc(queue, Q_INDEX);
150         }
151 }
152 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
153
154 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
155                       struct txdone_entry_desc *txdesc)
156 {
157         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
158         u32 word;
159
160         txdesc->control = &priv_tx->control;
161         rt2x00lib_txdone(entry, txdesc);
162
163         /*
164          * Make this entry available for reuse.
165          */
166         entry->flags = 0;
167
168         rt2x00_desc_read(priv_tx->desc, 0, &word);
169         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
170         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
171         rt2x00_desc_write(priv_tx->desc, 0, word);
172
173         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
174
175         /*
176          * If the data queue was full before the txdone handler
177          * we must make sure the packet queue in the mac80211 stack
178          * is reenabled when the txdone handler has finished.
179          */
180         if (!rt2x00queue_full(entry->queue))
181                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
182
183 }
184 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
185
186 /*
187  * Device initialization handlers.
188  */
189 #define desc_size(__queue)                      \
190 ({                                              \
191          ((__queue)->limit * (__queue)->desc_size);\
192 })
193
194 #define data_size(__queue)                      \
195 ({                                              \
196          ((__queue)->limit * (__queue)->data_size);\
197 })
198
199 #define dma_size(__queue)                       \
200 ({                                              \
201         data_size(__queue) + desc_size(__queue);\
202 })
203
204 #define desc_offset(__queue, __base, __i)       \
205 ({                                              \
206         (__base) + data_size(__queue) +         \
207             ((__i) * (__queue)->desc_size);     \
208 })
209
210 #define data_offset(__queue, __base, __i)       \
211 ({                                              \
212         (__base) +                              \
213             ((__i) * (__queue)->data_size);     \
214 })
215
216 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
217                                      struct data_queue *queue)
218 {
219         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
220         struct queue_entry_priv_pci_rx *priv_rx;
221         struct queue_entry_priv_pci_tx *priv_tx;
222         void *addr;
223         dma_addr_t dma;
224         void *desc_addr;
225         dma_addr_t desc_dma;
226         void *data_addr;
227         dma_addr_t data_dma;
228         unsigned int i;
229
230         /*
231          * Allocate DMA memory for descriptor and buffer.
232          */
233         addr = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
234         if (!addr)
235                 return -ENOMEM;
236
237         memset(addr, 0, dma_size(queue));
238
239         /*
240          * Initialize all queue entries to contain valid addresses.
241          */
242         for (i = 0; i < queue->limit; i++) {
243                 desc_addr = desc_offset(queue, addr, i);
244                 desc_dma = desc_offset(queue, dma, i);
245                 data_addr = data_offset(queue, addr, i);
246                 data_dma = data_offset(queue, dma, i);
247
248                 if (queue->qid == QID_RX) {
249                         priv_rx = queue->entries[i].priv_data;
250                         priv_rx->desc = desc_addr;
251                         priv_rx->desc_dma = desc_dma;
252                         priv_rx->data = data_addr;
253                         priv_rx->data_dma = data_dma;
254                 } else {
255                         priv_tx = queue->entries[i].priv_data;
256                         priv_tx->desc = desc_addr;
257                         priv_tx->desc_dma = desc_dma;
258                         priv_tx->data = data_addr;
259                         priv_tx->data_dma = data_dma;
260                 }
261         }
262
263         return 0;
264 }
265
266 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
267                                      struct data_queue *queue)
268 {
269         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
270         struct queue_entry_priv_pci_rx *priv_rx;
271         struct queue_entry_priv_pci_tx *priv_tx;
272         void *data_addr;
273         dma_addr_t data_dma;
274
275         if (queue->qid == QID_RX) {
276                 priv_rx = queue->entries[0].priv_data;
277                 data_addr = priv_rx->data;
278                 data_dma = priv_rx->data_dma;
279
280                 priv_rx->data = NULL;
281         } else {
282                 priv_tx = queue->entries[0].priv_data;
283                 data_addr = priv_tx->data;
284                 data_dma = priv_tx->data_dma;
285
286                 priv_tx->data = NULL;
287         }
288
289         if (data_addr)
290                 pci_free_consistent(pci_dev, dma_size(queue),
291                                     data_addr, data_dma);
292 }
293
294 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
295 {
296         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
297         struct data_queue *queue;
298         int status;
299
300         /*
301          * Allocate DMA
302          */
303         queue_for_each(rt2x00dev, queue) {
304                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
305                 if (status)
306                         goto exit;
307         }
308
309         /*
310          * Register interrupt handler.
311          */
312         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
313                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
314         if (status) {
315                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
316                       pci_dev->irq, status);
317                 return status;
318         }
319
320         return 0;
321
322 exit:
323         rt2x00pci_uninitialize(rt2x00dev);
324
325         return status;
326 }
327 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
328
329 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
330 {
331         struct data_queue *queue;
332
333         /*
334          * Free irq line.
335          */
336         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
337
338         /*
339          * Free DMA
340          */
341         queue_for_each(rt2x00dev, queue)
342                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
343 }
344 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
345
346 /*
347  * PCI driver handlers.
348  */
349 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
350 {
351         kfree(rt2x00dev->rf);
352         rt2x00dev->rf = NULL;
353
354         kfree(rt2x00dev->eeprom);
355         rt2x00dev->eeprom = NULL;
356
357         if (rt2x00dev->csr.base) {
358                 iounmap(rt2x00dev->csr.base);
359                 rt2x00dev->csr.base = NULL;
360         }
361 }
362
363 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
364 {
365         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
366
367         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
368                                       pci_resource_len(pci_dev, 0));
369         if (!rt2x00dev->csr.base)
370                 goto exit;
371
372         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
373         if (!rt2x00dev->eeprom)
374                 goto exit;
375
376         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
377         if (!rt2x00dev->rf)
378                 goto exit;
379
380         return 0;
381
382 exit:
383         ERROR_PROBE("Failed to allocate registers.\n");
384
385         rt2x00pci_free_reg(rt2x00dev);
386
387         return -ENOMEM;
388 }
389
390 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
391 {
392         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
393         struct ieee80211_hw *hw;
394         struct rt2x00_dev *rt2x00dev;
395         int retval;
396
397         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
398         if (retval) {
399                 ERROR_PROBE("PCI request regions failed.\n");
400                 return retval;
401         }
402
403         retval = pci_enable_device(pci_dev);
404         if (retval) {
405                 ERROR_PROBE("Enable device failed.\n");
406                 goto exit_release_regions;
407         }
408
409         pci_set_master(pci_dev);
410
411         if (pci_set_mwi(pci_dev))
412                 ERROR_PROBE("MWI not available.\n");
413
414         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
415             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
416                 ERROR_PROBE("PCI DMA not supported.\n");
417                 retval = -EIO;
418                 goto exit_disable_device;
419         }
420
421         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
422         if (!hw) {
423                 ERROR_PROBE("Failed to allocate hardware.\n");
424                 retval = -ENOMEM;
425                 goto exit_disable_device;
426         }
427
428         pci_set_drvdata(pci_dev, hw);
429
430         rt2x00dev = hw->priv;
431         rt2x00dev->dev = pci_dev;
432         rt2x00dev->ops = ops;
433         rt2x00dev->hw = hw;
434
435         retval = rt2x00pci_alloc_reg(rt2x00dev);
436         if (retval)
437                 goto exit_free_device;
438
439         retval = rt2x00lib_probe_dev(rt2x00dev);
440         if (retval)
441                 goto exit_free_reg;
442
443         return 0;
444
445 exit_free_reg:
446         rt2x00pci_free_reg(rt2x00dev);
447
448 exit_free_device:
449         ieee80211_free_hw(hw);
450
451 exit_disable_device:
452         if (retval != -EBUSY)
453                 pci_disable_device(pci_dev);
454
455 exit_release_regions:
456         pci_release_regions(pci_dev);
457
458         pci_set_drvdata(pci_dev, NULL);
459
460         return retval;
461 }
462 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
463
464 void rt2x00pci_remove(struct pci_dev *pci_dev)
465 {
466         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
467         struct rt2x00_dev *rt2x00dev = hw->priv;
468
469         /*
470          * Free all allocated data.
471          */
472         rt2x00lib_remove_dev(rt2x00dev);
473         rt2x00pci_free_reg(rt2x00dev);
474         ieee80211_free_hw(hw);
475
476         /*
477          * Free the PCI device data.
478          */
479         pci_set_drvdata(pci_dev, NULL);
480         pci_disable_device(pci_dev);
481         pci_release_regions(pci_dev);
482 }
483 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
484
485 #ifdef CONFIG_PM
486 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
487 {
488         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
489         struct rt2x00_dev *rt2x00dev = hw->priv;
490         int retval;
491
492         retval = rt2x00lib_suspend(rt2x00dev, state);
493         if (retval)
494                 return retval;
495
496         rt2x00pci_free_reg(rt2x00dev);
497
498         pci_save_state(pci_dev);
499         pci_disable_device(pci_dev);
500         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
501 }
502 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
503
504 int rt2x00pci_resume(struct pci_dev *pci_dev)
505 {
506         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
507         struct rt2x00_dev *rt2x00dev = hw->priv;
508         int retval;
509
510         if (pci_set_power_state(pci_dev, PCI_D0) ||
511             pci_enable_device(pci_dev) ||
512             pci_restore_state(pci_dev)) {
513                 ERROR(rt2x00dev, "Failed to resume device.\n");
514                 return -EIO;
515         }
516
517         retval = rt2x00pci_alloc_reg(rt2x00dev);
518         if (retval)
519                 return retval;
520
521         retval = rt2x00lib_resume(rt2x00dev);
522         if (retval)
523                 goto exit_free_reg;
524
525         return 0;
526
527 exit_free_reg:
528         rt2x00pci_free_reg(rt2x00dev);
529
530         return retval;
531 }
532 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
533 #endif /* CONFIG_PM */
534
535 /*
536  * rt2x00pci module information.
537  */
538 MODULE_AUTHOR(DRV_PROJECT);
539 MODULE_VERSION(DRV_VERSION);
540 MODULE_DESCRIPTION("rt2x00 pci library");
541 MODULE_LICENSE("GPL");