Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / drivers / net / wireless / rt2x00 / rt2x00pci.c
1 /*
2         Copyright (C) 2004 - 2009 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  * Register access.
36  */
37 int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev,
38                            const unsigned int offset,
39                            const struct rt2x00_field32 field,
40                            u32 *reg)
41 {
42         unsigned int i;
43
44         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
45                 rt2x00pci_register_read(rt2x00dev, offset, reg);
46                 if (!rt2x00_get_field32(*reg, field))
47                         return 1;
48                 udelay(REGISTER_BUSY_DELAY);
49         }
50
51         ERROR(rt2x00dev, "Indirect register access failed: "
52               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
53         *reg = ~0;
54
55         return 0;
56 }
57 EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);
58
59 /*
60  * TX data handlers.
61  */
62 int rt2x00pci_write_tx_data(struct queue_entry *entry)
63 {
64         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
65         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
66         struct skb_frame_desc *skbdesc;
67
68         /*
69          * This should not happen, we already checked the entry
70          * was ours. When the hardware disagrees there has been
71          * a queue corruption!
72          */
73         if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
74                 ERROR(rt2x00dev,
75                       "Corrupt queue %d, accessing entry which is not ours.\n"
76                       "Please file bug report to %s.\n",
77                       entry->queue->qid, DRV_PROJECT);
78                 return -EINVAL;
79         }
80
81         /*
82          * Fill in skb descriptor
83          */
84         skbdesc = get_skb_frame_desc(entry->skb);
85         skbdesc->desc = entry_priv->desc;
86         skbdesc->desc_len = entry->queue->desc_size;
87
88         return 0;
89 }
90 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
91
92 /*
93  * TX/RX data handlers.
94  */
95 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
96 {
97         struct data_queue *queue = rt2x00dev->rx;
98         struct queue_entry *entry;
99         struct queue_entry_priv_pci *entry_priv;
100         struct skb_frame_desc *skbdesc;
101
102         while (1) {
103                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
104                 entry_priv = entry->priv_data;
105
106                 if (rt2x00dev->ops->lib->get_entry_state(entry))
107                         break;
108
109                 /*
110                  * Fill in desc fields of the skb descriptor
111                  */
112                 skbdesc = get_skb_frame_desc(entry->skb);
113                 skbdesc->desc = entry_priv->desc;
114                 skbdesc->desc_len = entry->queue->desc_size;
115
116                 /*
117                  * Send the frame to rt2x00lib for further processing.
118                  */
119                 rt2x00lib_rxdone(rt2x00dev, entry);
120         }
121 }
122 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
123
124 /*
125  * Device initialization handlers.
126  */
127 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
128                                      struct data_queue *queue)
129 {
130         struct queue_entry_priv_pci *entry_priv;
131         void *addr;
132         dma_addr_t dma;
133         unsigned int i;
134
135         /*
136          * Allocate DMA memory for descriptor and buffer.
137          */
138         addr = dma_alloc_coherent(rt2x00dev->dev,
139                                   queue->limit * queue->desc_size,
140                                   &dma, GFP_KERNEL | GFP_DMA);
141         if (!addr)
142                 return -ENOMEM;
143
144         memset(addr, 0, queue->limit * queue->desc_size);
145
146         /*
147          * Initialize all queue entries to contain valid addresses.
148          */
149         for (i = 0; i < queue->limit; i++) {
150                 entry_priv = queue->entries[i].priv_data;
151                 entry_priv->desc = addr + i * queue->desc_size;
152                 entry_priv->desc_dma = dma + i * queue->desc_size;
153         }
154
155         return 0;
156 }
157
158 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
159                                      struct data_queue *queue)
160 {
161         struct queue_entry_priv_pci *entry_priv =
162             queue->entries[0].priv_data;
163
164         if (entry_priv->desc)
165                 dma_free_coherent(rt2x00dev->dev,
166                                   queue->limit * queue->desc_size,
167                                   entry_priv->desc, entry_priv->desc_dma);
168         entry_priv->desc = NULL;
169 }
170
171 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
172 {
173         struct data_queue *queue;
174         int status;
175
176         /*
177          * Allocate DMA
178          */
179         queue_for_each(rt2x00dev, queue) {
180                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
181                 if (status)
182                         goto exit;
183         }
184
185         /*
186          * Register interrupt handler.
187          */
188         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
189                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
190         if (status) {
191                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
192                       rt2x00dev->irq, status);
193                 goto exit;
194         }
195
196         return 0;
197
198 exit:
199         queue_for_each(rt2x00dev, queue)
200                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
201
202         return status;
203 }
204 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
205
206 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
207 {
208         struct data_queue *queue;
209
210         /*
211          * Free irq line.
212          */
213         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
214
215         /*
216          * Free DMA
217          */
218         queue_for_each(rt2x00dev, queue)
219                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
220 }
221 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
222
223 /*
224  * PCI driver handlers.
225  */
226 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
227 {
228         kfree(rt2x00dev->rf);
229         rt2x00dev->rf = NULL;
230
231         kfree(rt2x00dev->eeprom);
232         rt2x00dev->eeprom = NULL;
233
234         if (rt2x00dev->csr.base) {
235                 iounmap(rt2x00dev->csr.base);
236                 rt2x00dev->csr.base = NULL;
237         }
238 }
239
240 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
241 {
242         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
243
244         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
245         if (!rt2x00dev->csr.base)
246                 goto exit;
247
248         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
249         if (!rt2x00dev->eeprom)
250                 goto exit;
251
252         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
253         if (!rt2x00dev->rf)
254                 goto exit;
255
256         return 0;
257
258 exit:
259         ERROR_PROBE("Failed to allocate registers.\n");
260
261         rt2x00pci_free_reg(rt2x00dev);
262
263         return -ENOMEM;
264 }
265
266 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
267 {
268         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
269         struct ieee80211_hw *hw;
270         struct rt2x00_dev *rt2x00dev;
271         int retval;
272         u16 chip;
273
274         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
275         if (retval) {
276                 ERROR_PROBE("PCI request regions failed.\n");
277                 return retval;
278         }
279
280         retval = pci_enable_device(pci_dev);
281         if (retval) {
282                 ERROR_PROBE("Enable device failed.\n");
283                 goto exit_release_regions;
284         }
285
286         pci_set_master(pci_dev);
287
288         if (pci_set_mwi(pci_dev))
289                 ERROR_PROBE("MWI not available.\n");
290
291         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
292                 ERROR_PROBE("PCI DMA not supported.\n");
293                 retval = -EIO;
294                 goto exit_disable_device;
295         }
296
297         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
298         if (!hw) {
299                 ERROR_PROBE("Failed to allocate hardware.\n");
300                 retval = -ENOMEM;
301                 goto exit_disable_device;
302         }
303
304         pci_set_drvdata(pci_dev, hw);
305
306         rt2x00dev = hw->priv;
307         rt2x00dev->dev = &pci_dev->dev;
308         rt2x00dev->ops = ops;
309         rt2x00dev->hw = hw;
310         rt2x00dev->irq = pci_dev->irq;
311         rt2x00dev->name = pci_name(pci_dev);
312
313         /*
314          * Determine RT chipset by reading PCI header.
315          */
316         pci_read_config_word(pci_dev, PCI_DEVICE_ID, &chip);
317         rt2x00_set_chip_rt(rt2x00dev, chip);
318
319         retval = rt2x00pci_alloc_reg(rt2x00dev);
320         if (retval)
321                 goto exit_free_device;
322
323         retval = rt2x00lib_probe_dev(rt2x00dev);
324         if (retval)
325                 goto exit_free_reg;
326
327         return 0;
328
329 exit_free_reg:
330         rt2x00pci_free_reg(rt2x00dev);
331
332 exit_free_device:
333         ieee80211_free_hw(hw);
334
335 exit_disable_device:
336         if (retval != -EBUSY)
337                 pci_disable_device(pci_dev);
338
339 exit_release_regions:
340         pci_release_regions(pci_dev);
341
342         pci_set_drvdata(pci_dev, NULL);
343
344         return retval;
345 }
346 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
347
348 void rt2x00pci_remove(struct pci_dev *pci_dev)
349 {
350         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
351         struct rt2x00_dev *rt2x00dev = hw->priv;
352
353         /*
354          * Free all allocated data.
355          */
356         rt2x00lib_remove_dev(rt2x00dev);
357         rt2x00pci_free_reg(rt2x00dev);
358         ieee80211_free_hw(hw);
359
360         /*
361          * Free the PCI device data.
362          */
363         pci_set_drvdata(pci_dev, NULL);
364         pci_disable_device(pci_dev);
365         pci_release_regions(pci_dev);
366 }
367 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
368
369 #ifdef CONFIG_PM
370 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
371 {
372         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
373         struct rt2x00_dev *rt2x00dev = hw->priv;
374         int retval;
375
376         retval = rt2x00lib_suspend(rt2x00dev, state);
377         if (retval)
378                 return retval;
379
380         pci_save_state(pci_dev);
381         pci_disable_device(pci_dev);
382         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
383 }
384 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
385
386 int rt2x00pci_resume(struct pci_dev *pci_dev)
387 {
388         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
389         struct rt2x00_dev *rt2x00dev = hw->priv;
390
391         if (pci_set_power_state(pci_dev, PCI_D0) ||
392             pci_enable_device(pci_dev) ||
393             pci_restore_state(pci_dev)) {
394                 ERROR(rt2x00dev, "Failed to resume device.\n");
395                 return -EIO;
396         }
397
398         return rt2x00lib_resume(rt2x00dev);
399 }
400 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
401 #endif /* CONFIG_PM */
402
403 /*
404  * rt2x00pci module information.
405  */
406 MODULE_AUTHOR(DRV_PROJECT);
407 MODULE_VERSION(DRV_VERSION);
408 MODULE_DESCRIPTION("rt2x00 pci library");
409 MODULE_LICENSE("GPL");