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Linux/drivers/net/wireless/ti/wl1251/sdio.c

  1 /*
  2  * wl12xx SDIO routines
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful, but
  9  * WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11  * 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., 51 Franklin St, Fifth Floor, Boston, MA
 16  * 02110-1301 USA
 17  *
 18  * Copyright (C) 2005 Texas Instruments Incorporated
 19  * Copyright (C) 2008 Google Inc
 20  * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
 21  */
 22 #include <linux/interrupt.h>
 23 #include <linux/module.h>
 24 #include <linux/mod_devicetable.h>
 25 #include <linux/mmc/sdio_func.h>
 26 #include <linux/mmc/sdio_ids.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/wl12xx.h>
 29 #include <linux/irq.h>
 30 #include <linux/pm_runtime.h>
 31 
 32 #include "wl1251.h"
 33 
 34 #ifndef SDIO_VENDOR_ID_TI
 35 #define SDIO_VENDOR_ID_TI               0x104c
 36 #endif
 37 
 38 #ifndef SDIO_DEVICE_ID_TI_WL1251
 39 #define SDIO_DEVICE_ID_TI_WL1251        0x9066
 40 #endif
 41 
 42 struct wl1251_sdio {
 43         struct sdio_func *func;
 44         u32 elp_val;
 45 };
 46 
 47 static struct sdio_func *wl_to_func(struct wl1251 *wl)
 48 {
 49         struct wl1251_sdio *wl_sdio = wl->if_priv;
 50         return wl_sdio->func;
 51 }
 52 
 53 static void wl1251_sdio_interrupt(struct sdio_func *func)
 54 {
 55         struct wl1251 *wl = sdio_get_drvdata(func);
 56 
 57         wl1251_debug(DEBUG_IRQ, "IRQ");
 58 
 59         /* FIXME should be synchronous for sdio */
 60         ieee80211_queue_work(wl->hw, &wl->irq_work);
 61 }
 62 
 63 static const struct sdio_device_id wl1251_devices[] = {
 64         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
 65         {}
 66 };
 67 MODULE_DEVICE_TABLE(sdio, wl1251_devices);
 68 
 69 
 70 static void wl1251_sdio_read(struct wl1251 *wl, int addr,
 71                              void *buf, size_t len)
 72 {
 73         int ret;
 74         struct sdio_func *func = wl_to_func(wl);
 75 
 76         sdio_claim_host(func);
 77         ret = sdio_memcpy_fromio(func, buf, addr, len);
 78         if (ret)
 79                 wl1251_error("sdio read failed (%d)", ret);
 80         sdio_release_host(func);
 81 }
 82 
 83 static void wl1251_sdio_write(struct wl1251 *wl, int addr,
 84                               void *buf, size_t len)
 85 {
 86         int ret;
 87         struct sdio_func *func = wl_to_func(wl);
 88 
 89         sdio_claim_host(func);
 90         ret = sdio_memcpy_toio(func, addr, buf, len);
 91         if (ret)
 92                 wl1251_error("sdio write failed (%d)", ret);
 93         sdio_release_host(func);
 94 }
 95 
 96 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
 97 {
 98         int ret = 0;
 99         struct wl1251_sdio *wl_sdio = wl->if_priv;
100         struct sdio_func *func = wl_sdio->func;
101 
102         /*
103          * The hardware only supports RAW (read after write) access for
104          * reading, regular sdio_readb won't work here (it interprets
105          * the unused bits of CMD52 as write data even if we send read
106          * request).
107          */
108         sdio_claim_host(func);
109         *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
110         sdio_release_host(func);
111 
112         if (ret)
113                 wl1251_error("sdio_readb failed (%d)", ret);
114 }
115 
116 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
117 {
118         int ret = 0;
119         struct wl1251_sdio *wl_sdio = wl->if_priv;
120         struct sdio_func *func = wl_sdio->func;
121 
122         sdio_claim_host(func);
123         sdio_writeb(func, val, addr, &ret);
124         sdio_release_host(func);
125 
126         if (ret)
127                 wl1251_error("sdio_writeb failed (%d)", ret);
128         else
129                 wl_sdio->elp_val = val;
130 }
131 
132 static void wl1251_sdio_reset(struct wl1251 *wl)
133 {
134 }
135 
136 static void wl1251_sdio_enable_irq(struct wl1251 *wl)
137 {
138         struct sdio_func *func = wl_to_func(wl);
139 
140         sdio_claim_host(func);
141         sdio_claim_irq(func, wl1251_sdio_interrupt);
142         sdio_release_host(func);
143 }
144 
145 static void wl1251_sdio_disable_irq(struct wl1251 *wl)
146 {
147         struct sdio_func *func = wl_to_func(wl);
148 
149         sdio_claim_host(func);
150         sdio_release_irq(func);
151         sdio_release_host(func);
152 }
153 
154 /* Interrupts when using dedicated WLAN_IRQ pin */
155 static irqreturn_t wl1251_line_irq(int irq, void *cookie)
156 {
157         struct wl1251 *wl = cookie;
158 
159         ieee80211_queue_work(wl->hw, &wl->irq_work);
160 
161         return IRQ_HANDLED;
162 }
163 
164 static void wl1251_enable_line_irq(struct wl1251 *wl)
165 {
166         return enable_irq(wl->irq);
167 }
168 
169 static void wl1251_disable_line_irq(struct wl1251 *wl)
170 {
171         return disable_irq(wl->irq);
172 }
173 
174 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
175 {
176         struct sdio_func *func = wl_to_func(wl);
177         int ret;
178 
179         if (enable) {
180                 /*
181                  * Power is controlled by runtime PM, but we still call board
182                  * callback in case it wants to do any additional setup,
183                  * for example enabling clock buffer for the module.
184                  */
185                 if (wl->set_power)
186                         wl->set_power(true);
187 
188                 ret = pm_runtime_get_sync(&func->dev);
189                 if (ret < 0) {
190                         pm_runtime_put_sync(&func->dev);
191                         goto out;
192                 }
193 
194                 sdio_claim_host(func);
195                 sdio_enable_func(func);
196                 sdio_release_host(func);
197         } else {
198                 sdio_claim_host(func);
199                 sdio_disable_func(func);
200                 sdio_release_host(func);
201 
202                 ret = pm_runtime_put_sync(&func->dev);
203                 if (ret < 0)
204                         goto out;
205 
206                 if (wl->set_power)
207                         wl->set_power(false);
208         }
209 
210 out:
211         return ret;
212 }
213 
214 static struct wl1251_if_operations wl1251_sdio_ops = {
215         .read = wl1251_sdio_read,
216         .write = wl1251_sdio_write,
217         .write_elp = wl1251_sdio_write_elp,
218         .read_elp = wl1251_sdio_read_elp,
219         .reset = wl1251_sdio_reset,
220         .power = wl1251_sdio_set_power,
221 };
222 
223 static int wl1251_sdio_probe(struct sdio_func *func,
224                              const struct sdio_device_id *id)
225 {
226         int ret;
227         struct wl1251 *wl;
228         struct ieee80211_hw *hw;
229         struct wl1251_sdio *wl_sdio;
230         const struct wl12xx_platform_data *wl12xx_board_data;
231 
232         hw = wl1251_alloc_hw();
233         if (IS_ERR(hw))
234                 return PTR_ERR(hw);
235 
236         wl = hw->priv;
237 
238         wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
239         if (wl_sdio == NULL) {
240                 ret = -ENOMEM;
241                 goto out_free_hw;
242         }
243 
244         sdio_claim_host(func);
245         ret = sdio_enable_func(func);
246         if (ret)
247                 goto release;
248 
249         sdio_set_block_size(func, 512);
250         sdio_release_host(func);
251 
252         SET_IEEE80211_DEV(hw, &func->dev);
253         wl_sdio->func = func;
254         wl->if_priv = wl_sdio;
255         wl->if_ops = &wl1251_sdio_ops;
256 
257         wl12xx_board_data = wl12xx_get_platform_data();
258         if (!IS_ERR(wl12xx_board_data)) {
259                 wl->set_power = wl12xx_board_data->set_power;
260                 wl->irq = wl12xx_board_data->irq;
261                 wl->use_eeprom = wl12xx_board_data->use_eeprom;
262         }
263 
264         if (wl->irq) {
265                 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
266                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
267                 if (ret < 0) {
268                         wl1251_error("request_irq() failed: %d", ret);
269                         goto disable;
270                 }
271 
272                 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
273 
274                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
275                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
276 
277                 wl1251_info("using dedicated interrupt line");
278         } else {
279                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
280                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
281 
282                 wl1251_info("using SDIO interrupt");
283         }
284 
285         ret = wl1251_init_ieee80211(wl);
286         if (ret)
287                 goto out_free_irq;
288 
289         sdio_set_drvdata(func, wl);
290 
291         /* Tell PM core that we don't need the card to be powered now */
292         pm_runtime_put_noidle(&func->dev);
293 
294         return ret;
295 
296 out_free_irq:
297         if (wl->irq)
298                 free_irq(wl->irq, wl);
299 disable:
300         sdio_claim_host(func);
301         sdio_disable_func(func);
302 release:
303         sdio_release_host(func);
304         kfree(wl_sdio);
305 out_free_hw:
306         wl1251_free_hw(wl);
307         return ret;
308 }
309 
310 static void wl1251_sdio_remove(struct sdio_func *func)
311 {
312         struct wl1251 *wl = sdio_get_drvdata(func);
313         struct wl1251_sdio *wl_sdio = wl->if_priv;
314 
315         /* Undo decrement done above in wl1251_probe */
316         pm_runtime_get_noresume(&func->dev);
317 
318         if (wl->irq)
319                 free_irq(wl->irq, wl);
320         wl1251_free_hw(wl);
321         kfree(wl_sdio);
322 
323         sdio_claim_host(func);
324         sdio_release_irq(func);
325         sdio_disable_func(func);
326         sdio_release_host(func);
327 }
328 
329 static int wl1251_suspend(struct device *dev)
330 {
331         /*
332          * Tell MMC/SDIO core it's OK to power down the card
333          * (if it isn't already), but not to remove it completely.
334          */
335         return 0;
336 }
337 
338 static int wl1251_resume(struct device *dev)
339 {
340         return 0;
341 }
342 
343 static const struct dev_pm_ops wl1251_sdio_pm_ops = {
344         .suspend        = wl1251_suspend,
345         .resume         = wl1251_resume,
346 };
347 
348 static struct sdio_driver wl1251_sdio_driver = {
349         .name           = "wl1251_sdio",
350         .id_table       = wl1251_devices,
351         .probe          = wl1251_sdio_probe,
352         .remove         = wl1251_sdio_remove,
353         .drv.pm         = &wl1251_sdio_pm_ops,
354 };
355 
356 static int __init wl1251_sdio_init(void)
357 {
358         int err;
359 
360         err = sdio_register_driver(&wl1251_sdio_driver);
361         if (err)
362                 wl1251_error("failed to register sdio driver: %d", err);
363         return err;
364 }
365 
366 static void __exit wl1251_sdio_exit(void)
367 {
368         sdio_unregister_driver(&wl1251_sdio_driver);
369         wl1251_notice("unloaded");
370 }
371 
372 module_init(wl1251_sdio_init);
373 module_exit(wl1251_sdio_exit);
374 
375 MODULE_LICENSE("GPL");
376 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
377 

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