[RT2x00]: add driver for Ralink wireless hardware
[linux-2.6.git] / drivers / net / wireless / rt2x00 / rt2x00pci.c
1 /*
2         Copyright (C) 2004 - 2007 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 /*
27  * Set enviroment defines for rt2x00.h
28  */
29 #define DRV_NAME "rt2x00pci"
30
31 #include <linux/dma-mapping.h>
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/pci.h>
35
36 #include "rt2x00.h"
37 #include "rt2x00pci.h"
38
39 /*
40  * Beacon handlers.
41  */
42 int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
43                             struct ieee80211_tx_control *control)
44 {
45         struct rt2x00_dev *rt2x00dev = hw->priv;
46         struct data_ring *ring =
47             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
48         struct data_entry *entry = rt2x00_get_data_entry(ring);
49
50         /*
51          * Just in case mac80211 doesn't set this correctly,
52          * but we need this queue set for the descriptor
53          * initialization.
54          */
55         control->queue = IEEE80211_TX_QUEUE_BEACON;
56
57         /*
58          * Update the beacon entry.
59          */
60         memcpy(entry->data_addr, skb->data, skb->len);
61         rt2x00lib_write_tx_desc(rt2x00dev, entry->priv,
62                                 (struct ieee80211_hdr *)skb->data,
63                                 skb->len, control);
64
65         /*
66          * Enable beacon generation.
67          */
68         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
69
70         return 0;
71 }
72 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
73
74 /*
75  * TX data handlers.
76  */
77 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
78                             struct data_ring *ring, struct sk_buff *skb,
79                             struct ieee80211_tx_control *control)
80 {
81         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
82         struct data_entry *entry = rt2x00_get_data_entry(ring);
83         struct data_desc *txd = entry->priv;
84         u32 word;
85
86         if (rt2x00_ring_full(ring)) {
87                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
88                 return -EINVAL;
89         }
90
91         rt2x00_desc_read(txd, 0, &word);
92
93         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
94             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
95                 ERROR(rt2x00dev,
96                       "Arrived at non-free entry in the non-full queue %d.\n"
97                       "Please file bug report to %s.\n",
98                       control->queue, DRV_PROJECT);
99                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
100                 return -EINVAL;
101         }
102
103         entry->skb = skb;
104         memcpy(&entry->tx_status.control, control, sizeof(*control));
105         memcpy(entry->data_addr, skb->data, skb->len);
106         rt2x00lib_write_tx_desc(rt2x00dev, txd, ieee80211hdr,
107                                 skb->len, control);
108
109         rt2x00_ring_index_inc(ring);
110
111         if (rt2x00_ring_full(ring))
112                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
113
114         return 0;
115 }
116 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
117
118 /*
119  * RX data handlers.
120  */
121 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
122 {
123         struct data_ring *ring = rt2x00dev->rx;
124         struct data_entry *entry;
125         struct data_desc *rxd;
126         struct sk_buff *skb;
127         u32 desc;
128         int retval;
129         int signal;
130         int rssi;
131         int ofdm;
132         int size;
133
134         while (1) {
135                 entry = rt2x00_get_data_entry(ring);
136                 rxd = entry->priv;
137                 rt2x00_desc_read(rxd, 0, &desc);
138
139                 if (rt2x00_get_field32(desc, RXD_ENTRY_OWNER_NIC))
140                         break;
141
142                 retval = rt2x00dev->ops->lib->fill_rxdone(entry, &signal,
143                                                           &rssi, &ofdm, &size);
144                 if (retval)
145                         goto skip_entry;
146
147                 /*
148                  * Allocate the sk_buffer, initialize it and copy
149                  * all data into it.
150                  */
151                 skb = dev_alloc_skb(size + NET_IP_ALIGN);
152                 if (!skb)
153                         return;
154
155                 skb_reserve(skb, NET_IP_ALIGN);
156                 skb_put(skb, size);
157                 memcpy(skb->data, entry->data_addr, size);
158
159                 /*
160                  * Send the frame to rt2x00lib for further processing.
161                  */
162                 rt2x00lib_rxdone(entry, skb, signal, rssi, ofdm);
163
164 skip_entry:
165                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
166                         rt2x00_set_field32(&desc, RXD_ENTRY_OWNER_NIC, 1);
167                         rt2x00_desc_write(rxd, 0, desc);
168                 }
169
170                 rt2x00_ring_index_inc(ring);
171         }
172 }
173 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
174
175 /*
176  * Device initialization handlers.
177  */
178 #define priv_offset(__ring, __i)                                \
179 ({                                                              \
180         ring->data_addr + (i * ring->desc_size);                \
181 })
182
183 #define data_addr_offset(__ring, __i)                           \
184 ({                                                              \
185         (__ring)->data_addr +                                   \
186             ((__ring)->stats.limit * (__ring)->desc_size) +     \
187             ((__i) * (__ring)->data_size);                      \
188 })
189
190 #define data_dma_offset(__ring, __i)                            \
191 ({                                                              \
192         (__ring)->data_dma +                                    \
193             ((__ring)->stats.limit * (__ring)->desc_size) +     \
194             ((__i) * (__ring)->data_size);                      \
195 })
196
197 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
198                                struct data_ring *ring)
199 {
200         unsigned int i;
201
202         /*
203          * Allocate DMA memory for descriptor and buffer.
204          */
205         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
206                                                rt2x00_get_ring_size(ring),
207                                                &ring->data_dma);
208         if (!ring->data_addr)
209                 return -ENOMEM;
210
211         /*
212          * Initialize all ring entries to contain valid
213          * addresses.
214          */
215         for (i = 0; i < ring->stats.limit; i++) {
216                 ring->entry[i].priv = priv_offset(ring, i);
217                 ring->entry[i].data_addr = data_addr_offset(ring, i);
218                 ring->entry[i].data_dma = data_dma_offset(ring, i);
219         }
220
221         return 0;
222 }
223
224 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
225                                struct data_ring *ring)
226 {
227         if (ring->data_addr)
228                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
229                                     rt2x00_get_ring_size(ring),
230                                     ring->data_addr, ring->data_dma);
231         ring->data_addr = NULL;
232 }
233
234 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
235 {
236         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
237         struct data_ring *ring;
238         int status;
239
240         /*
241          * Allocate DMA
242          */
243         ring_for_each(rt2x00dev, ring) {
244                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
245                 if (status)
246                         goto exit;
247         }
248
249         /*
250          * Register interrupt handler.
251          */
252         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
253                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
254         if (status) {
255                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
256                       pci_dev->irq, status);
257                 return status;
258         }
259
260         return 0;
261
262 exit:
263         rt2x00pci_uninitialize(rt2x00dev);
264
265         return status;
266 }
267 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
268
269 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
270 {
271         struct data_ring *ring;
272
273         /*
274          * Free irq line.
275          */
276         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
277
278         /*
279          * Free DMA
280          */
281         ring_for_each(rt2x00dev, ring)
282                 rt2x00pci_free_dma(rt2x00dev, ring);
283 }
284 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
285
286 /*
287  * PCI driver handlers.
288  */
289 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
290 {
291         kfree(rt2x00dev->rf);
292         rt2x00dev->rf = NULL;
293
294         kfree(rt2x00dev->eeprom);
295         rt2x00dev->eeprom = NULL;
296
297         if (rt2x00dev->csr_addr) {
298                 iounmap(rt2x00dev->csr_addr);
299                 rt2x00dev->csr_addr = NULL;
300         }
301 }
302
303 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
304 {
305         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
306
307         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
308                                       pci_resource_len(pci_dev, 0));
309         if (!rt2x00dev->csr_addr)
310                 goto exit;
311
312         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
313         if (!rt2x00dev->eeprom)
314                 goto exit;
315
316         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
317         if (!rt2x00dev->rf)
318                 goto exit;
319
320         return 0;
321
322 exit:
323         ERROR_PROBE("Failed to allocate registers.\n");
324
325         rt2x00pci_free_reg(rt2x00dev);
326
327         return -ENOMEM;
328 }
329
330 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
331 {
332         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
333         struct ieee80211_hw *hw;
334         struct rt2x00_dev *rt2x00dev;
335         int retval;
336
337         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
338         if (retval) {
339                 ERROR_PROBE("PCI request regions failed.\n");
340                 return retval;
341         }
342
343         retval = pci_enable_device(pci_dev);
344         if (retval) {
345                 ERROR_PROBE("Enable device failed.\n");
346                 goto exit_release_regions;
347         }
348
349         pci_set_master(pci_dev);
350
351         if (pci_set_mwi(pci_dev))
352                 ERROR_PROBE("MWI not available.\n");
353
354         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
355             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
356                 ERROR_PROBE("PCI DMA not supported.\n");
357                 retval = -EIO;
358                 goto exit_disable_device;
359         }
360
361         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
362         if (!hw) {
363                 ERROR_PROBE("Failed to allocate hardware.\n");
364                 retval = -ENOMEM;
365                 goto exit_disable_device;
366         }
367
368         pci_set_drvdata(pci_dev, hw);
369
370         rt2x00dev = hw->priv;
371         rt2x00dev->dev = pci_dev;
372         rt2x00dev->ops = ops;
373         rt2x00dev->hw = hw;
374
375         retval = rt2x00pci_alloc_reg(rt2x00dev);
376         if (retval)
377                 goto exit_free_device;
378
379         retval = rt2x00lib_probe_dev(rt2x00dev);
380         if (retval)
381                 goto exit_free_reg;
382
383         return 0;
384
385 exit_free_reg:
386         rt2x00pci_free_reg(rt2x00dev);
387
388 exit_free_device:
389         ieee80211_free_hw(hw);
390
391 exit_disable_device:
392         if (retval != -EBUSY)
393                 pci_disable_device(pci_dev);
394
395 exit_release_regions:
396         pci_release_regions(pci_dev);
397
398         pci_set_drvdata(pci_dev, NULL);
399
400         return retval;
401 }
402 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
403
404 void rt2x00pci_remove(struct pci_dev *pci_dev)
405 {
406         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
407         struct rt2x00_dev *rt2x00dev = hw->priv;
408
409         /*
410          * Free all allocated data.
411          */
412         rt2x00lib_remove_dev(rt2x00dev);
413         rt2x00pci_free_reg(rt2x00dev);
414         ieee80211_free_hw(hw);
415
416         /*
417          * Free the PCI device data.
418          */
419         pci_set_drvdata(pci_dev, NULL);
420         pci_disable_device(pci_dev);
421         pci_release_regions(pci_dev);
422 }
423 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
424
425 #ifdef CONFIG_PM
426 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
427 {
428         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
429         struct rt2x00_dev *rt2x00dev = hw->priv;
430         int retval;
431
432         retval = rt2x00lib_suspend(rt2x00dev, state);
433         if (retval)
434                 return retval;
435
436         rt2x00pci_free_reg(rt2x00dev);
437
438         pci_save_state(pci_dev);
439         pci_disable_device(pci_dev);
440         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
441 }
442 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
443
444 int rt2x00pci_resume(struct pci_dev *pci_dev)
445 {
446         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
447         struct rt2x00_dev *rt2x00dev = hw->priv;
448         int retval;
449
450         if (pci_set_power_state(pci_dev, PCI_D0) ||
451             pci_enable_device(pci_dev) ||
452             pci_restore_state(pci_dev)) {
453                 ERROR(rt2x00dev, "Failed to resume device.\n");
454                 return -EIO;
455         }
456
457         retval = rt2x00pci_alloc_reg(rt2x00dev);
458         if (retval)
459                 return retval;
460
461         retval = rt2x00lib_resume(rt2x00dev);
462         if (retval)
463                 goto exit_free_reg;
464
465         return 0;
466
467 exit_free_reg:
468         rt2x00pci_free_reg(rt2x00dev);
469
470         return retval;
471 }
472 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
473 #endif /* CONFIG_PM */
474
475 /*
476  * rt2x00pci module information.
477  */
478 MODULE_AUTHOR(DRV_PROJECT);
479 MODULE_VERSION(DRV_VERSION);
480 MODULE_DESCRIPTION("rt2x00 library");
481 MODULE_LICENSE("GPL");