Merge commit 'v2.6.30-rc5' into x86/apic
[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 pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
174         struct data_queue *queue;
175         int status;
176
177         /*
178          * Allocate DMA
179          */
180         queue_for_each(rt2x00dev, queue) {
181                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
182                 if (status)
183                         goto exit;
184         }
185
186         /*
187          * Register interrupt handler.
188          */
189         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
190                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
191         if (status) {
192                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
193                       pci_dev->irq, status);
194                 goto exit;
195         }
196
197         return 0;
198
199 exit:
200         queue_for_each(rt2x00dev, queue)
201                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
202
203         return status;
204 }
205 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
206
207 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
208 {
209         struct data_queue *queue;
210
211         /*
212          * Free irq line.
213          */
214         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
215
216         /*
217          * Free DMA
218          */
219         queue_for_each(rt2x00dev, queue)
220                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
221 }
222 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
223
224 /*
225  * PCI driver handlers.
226  */
227 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
228 {
229         kfree(rt2x00dev->rf);
230         rt2x00dev->rf = NULL;
231
232         kfree(rt2x00dev->eeprom);
233         rt2x00dev->eeprom = NULL;
234
235         if (rt2x00dev->csr.base) {
236                 iounmap(rt2x00dev->csr.base);
237                 rt2x00dev->csr.base = NULL;
238         }
239 }
240
241 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
242 {
243         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
244
245         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
246         if (!rt2x00dev->csr.base)
247                 goto exit;
248
249         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
250         if (!rt2x00dev->eeprom)
251                 goto exit;
252
253         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
254         if (!rt2x00dev->rf)
255                 goto exit;
256
257         return 0;
258
259 exit:
260         ERROR_PROBE("Failed to allocate registers.\n");
261
262         rt2x00pci_free_reg(rt2x00dev);
263
264         return -ENOMEM;
265 }
266
267 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
268 {
269         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
270         struct ieee80211_hw *hw;
271         struct rt2x00_dev *rt2x00dev;
272         int retval;
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
311         retval = rt2x00pci_alloc_reg(rt2x00dev);
312         if (retval)
313                 goto exit_free_device;
314
315         retval = rt2x00lib_probe_dev(rt2x00dev);
316         if (retval)
317                 goto exit_free_reg;
318
319         return 0;
320
321 exit_free_reg:
322         rt2x00pci_free_reg(rt2x00dev);
323
324 exit_free_device:
325         ieee80211_free_hw(hw);
326
327 exit_disable_device:
328         if (retval != -EBUSY)
329                 pci_disable_device(pci_dev);
330
331 exit_release_regions:
332         pci_release_regions(pci_dev);
333
334         pci_set_drvdata(pci_dev, NULL);
335
336         return retval;
337 }
338 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
339
340 void rt2x00pci_remove(struct pci_dev *pci_dev)
341 {
342         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
343         struct rt2x00_dev *rt2x00dev = hw->priv;
344
345         /*
346          * Free all allocated data.
347          */
348         rt2x00lib_remove_dev(rt2x00dev);
349         rt2x00pci_free_reg(rt2x00dev);
350         ieee80211_free_hw(hw);
351
352         /*
353          * Free the PCI device data.
354          */
355         pci_set_drvdata(pci_dev, NULL);
356         pci_disable_device(pci_dev);
357         pci_release_regions(pci_dev);
358 }
359 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
360
361 #ifdef CONFIG_PM
362 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
363 {
364         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
365         struct rt2x00_dev *rt2x00dev = hw->priv;
366         int retval;
367
368         retval = rt2x00lib_suspend(rt2x00dev, state);
369         if (retval)
370                 return retval;
371
372         pci_save_state(pci_dev);
373         pci_disable_device(pci_dev);
374         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
375 }
376 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
377
378 int rt2x00pci_resume(struct pci_dev *pci_dev)
379 {
380         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
381         struct rt2x00_dev *rt2x00dev = hw->priv;
382
383         if (pci_set_power_state(pci_dev, PCI_D0) ||
384             pci_enable_device(pci_dev) ||
385             pci_restore_state(pci_dev)) {
386                 ERROR(rt2x00dev, "Failed to resume device.\n");
387                 return -EIO;
388         }
389
390         return rt2x00lib_resume(rt2x00dev);
391 }
392 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
393 #endif /* CONFIG_PM */
394
395 /*
396  * rt2x00pci module information.
397  */
398 MODULE_AUTHOR(DRV_PROJECT);
399 MODULE_VERSION(DRV_VERSION);
400 MODULE_DESCRIPTION("rt2x00 pci library");
401 MODULE_LICENSE("GPL");