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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 #include <linux/gpio.h>
 32 
 33 #include "wl1251.h"
 34 
 35 #ifndef SDIO_VENDOR_ID_TI
 36 #define SDIO_VENDOR_ID_TI               0x104c
 37 #endif
 38 
 39 #ifndef SDIO_DEVICE_ID_TI_WL1251
 40 #define SDIO_DEVICE_ID_TI_WL1251        0x9066
 41 #endif
 42 
 43 struct wl1251_sdio {
 44         struct sdio_func *func;
 45         u32 elp_val;
 46 };
 47 
 48 static struct sdio_func *wl_to_func(struct wl1251 *wl)
 49 {
 50         struct wl1251_sdio *wl_sdio = wl->if_priv;
 51         return wl_sdio->func;
 52 }
 53 
 54 static void wl1251_sdio_interrupt(struct sdio_func *func)
 55 {
 56         struct wl1251 *wl = sdio_get_drvdata(func);
 57 
 58         wl1251_debug(DEBUG_IRQ, "IRQ");
 59 
 60         /* FIXME should be synchronous for sdio */
 61         ieee80211_queue_work(wl->hw, &wl->irq_work);
 62 }
 63 
 64 static const struct sdio_device_id wl1251_devices[] = {
 65         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
 66         {}
 67 };
 68 MODULE_DEVICE_TABLE(sdio, wl1251_devices);
 69 
 70 
 71 static void wl1251_sdio_read(struct wl1251 *wl, int addr,
 72                              void *buf, size_t len)
 73 {
 74         int ret;
 75         struct sdio_func *func = wl_to_func(wl);
 76 
 77         sdio_claim_host(func);
 78         ret = sdio_memcpy_fromio(func, buf, addr, len);
 79         if (ret)
 80                 wl1251_error("sdio read failed (%d)", ret);
 81         sdio_release_host(func);
 82 }
 83 
 84 static void wl1251_sdio_write(struct wl1251 *wl, int addr,
 85                               void *buf, size_t len)
 86 {
 87         int ret;
 88         struct sdio_func *func = wl_to_func(wl);
 89 
 90         sdio_claim_host(func);
 91         ret = sdio_memcpy_toio(func, addr, buf, len);
 92         if (ret)
 93                 wl1251_error("sdio write failed (%d)", ret);
 94         sdio_release_host(func);
 95 }
 96 
 97 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
 98 {
 99         int ret = 0;
100         struct wl1251_sdio *wl_sdio = wl->if_priv;
101         struct sdio_func *func = wl_sdio->func;
102 
103         /*
104          * The hardware only supports RAW (read after write) access for
105          * reading, regular sdio_readb won't work here (it interprets
106          * the unused bits of CMD52 as write data even if we send read
107          * request).
108          */
109         sdio_claim_host(func);
110         *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
111         sdio_release_host(func);
112 
113         if (ret)
114                 wl1251_error("sdio_readb failed (%d)", ret);
115 }
116 
117 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
118 {
119         int ret = 0;
120         struct wl1251_sdio *wl_sdio = wl->if_priv;
121         struct sdio_func *func = wl_sdio->func;
122 
123         sdio_claim_host(func);
124         sdio_writeb(func, val, addr, &ret);
125         sdio_release_host(func);
126 
127         if (ret)
128                 wl1251_error("sdio_writeb failed (%d)", ret);
129         else
130                 wl_sdio->elp_val = val;
131 }
132 
133 static void wl1251_sdio_reset(struct wl1251 *wl)
134 {
135 }
136 
137 static void wl1251_sdio_enable_irq(struct wl1251 *wl)
138 {
139         struct sdio_func *func = wl_to_func(wl);
140 
141         sdio_claim_host(func);
142         sdio_claim_irq(func, wl1251_sdio_interrupt);
143         sdio_release_host(func);
144 }
145 
146 static void wl1251_sdio_disable_irq(struct wl1251 *wl)
147 {
148         struct sdio_func *func = wl_to_func(wl);
149 
150         sdio_claim_host(func);
151         sdio_release_irq(func);
152         sdio_release_host(func);
153 }
154 
155 /* Interrupts when using dedicated WLAN_IRQ pin */
156 static irqreturn_t wl1251_line_irq(int irq, void *cookie)
157 {
158         struct wl1251 *wl = cookie;
159 
160         ieee80211_queue_work(wl->hw, &wl->irq_work);
161 
162         return IRQ_HANDLED;
163 }
164 
165 static void wl1251_enable_line_irq(struct wl1251 *wl)
166 {
167         return enable_irq(wl->irq);
168 }
169 
170 static void wl1251_disable_line_irq(struct wl1251 *wl)
171 {
172         return disable_irq(wl->irq);
173 }
174 
175 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
176 {
177         struct sdio_func *func = wl_to_func(wl);
178         int ret;
179 
180         if (enable) {
181                 /*
182                  * Power is controlled by runtime PM, but we still call board
183                  * callback in case it wants to do any additional setup,
184                  * for example enabling clock buffer for the module.
185                  */
186                 if (gpio_is_valid(wl->power_gpio))
187                         gpio_set_value(wl->power_gpio, true);
188 
189 
190                 ret = pm_runtime_get_sync(&func->dev);
191                 if (ret < 0) {
192                         pm_runtime_put_sync(&func->dev);
193                         goto out;
194                 }
195 
196                 sdio_claim_host(func);
197                 sdio_enable_func(func);
198                 sdio_release_host(func);
199         } else {
200                 sdio_claim_host(func);
201                 sdio_disable_func(func);
202                 sdio_release_host(func);
203 
204                 ret = pm_runtime_put_sync(&func->dev);
205                 if (ret < 0)
206                         goto out;
207 
208                 if (gpio_is_valid(wl->power_gpio))
209                         gpio_set_value(wl->power_gpio, false);
210         }
211 
212 out:
213         return ret;
214 }
215 
216 static struct wl1251_if_operations wl1251_sdio_ops = {
217         .read = wl1251_sdio_read,
218         .write = wl1251_sdio_write,
219         .write_elp = wl1251_sdio_write_elp,
220         .read_elp = wl1251_sdio_read_elp,
221         .reset = wl1251_sdio_reset,
222         .power = wl1251_sdio_set_power,
223 };
224 
225 static int wl1251_sdio_probe(struct sdio_func *func,
226                              const struct sdio_device_id *id)
227 {
228         int ret;
229         struct wl1251 *wl;
230         struct ieee80211_hw *hw;
231         struct wl1251_sdio *wl_sdio;
232         const struct wl1251_platform_data *wl1251_board_data;
233 
234         hw = wl1251_alloc_hw();
235         if (IS_ERR(hw))
236                 return PTR_ERR(hw);
237 
238         wl = hw->priv;
239 
240         wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
241         if (wl_sdio == NULL) {
242                 ret = -ENOMEM;
243                 goto out_free_hw;
244         }
245 
246         sdio_claim_host(func);
247         ret = sdio_enable_func(func);
248         if (ret)
249                 goto release;
250 
251         sdio_set_block_size(func, 512);
252         sdio_release_host(func);
253 
254         SET_IEEE80211_DEV(hw, &func->dev);
255         wl_sdio->func = func;
256         wl->if_priv = wl_sdio;
257         wl->if_ops = &wl1251_sdio_ops;
258 
259         wl1251_board_data = wl1251_get_platform_data();
260         if (!IS_ERR(wl1251_board_data)) {
261                 wl->power_gpio = wl1251_board_data->power_gpio;
262                 wl->irq = wl1251_board_data->irq;
263                 wl->use_eeprom = wl1251_board_data->use_eeprom;
264         }
265 
266         if (gpio_is_valid(wl->power_gpio)) {
267                 ret = devm_gpio_request(&func->dev, wl->power_gpio,
268                                                                 "wl1251 power");
269                 if (ret) {
270                         wl1251_error("Failed to request gpio: %d\n", ret);
271                         goto disable;
272                 }
273         }
274 
275         if (wl->irq) {
276                 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
277                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
278                 if (ret < 0) {
279                         wl1251_error("request_irq() failed: %d", ret);
280                         goto disable;
281                 }
282 
283                 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
284 
285                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
286                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
287 
288                 wl1251_info("using dedicated interrupt line");
289         } else {
290                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
291                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
292 
293                 wl1251_info("using SDIO interrupt");
294         }
295 
296         ret = wl1251_init_ieee80211(wl);
297         if (ret)
298                 goto out_free_irq;
299 
300         sdio_set_drvdata(func, wl);
301 
302         /* Tell PM core that we don't need the card to be powered now */
303         pm_runtime_put_noidle(&func->dev);
304 
305         return ret;
306 
307 out_free_irq:
308         if (wl->irq)
309                 free_irq(wl->irq, wl);
310 disable:
311         sdio_claim_host(func);
312         sdio_disable_func(func);
313 release:
314         sdio_release_host(func);
315         kfree(wl_sdio);
316 out_free_hw:
317         wl1251_free_hw(wl);
318         return ret;
319 }
320 
321 static void wl1251_sdio_remove(struct sdio_func *func)
322 {
323         struct wl1251 *wl = sdio_get_drvdata(func);
324         struct wl1251_sdio *wl_sdio = wl->if_priv;
325 
326         /* Undo decrement done above in wl1251_probe */
327         pm_runtime_get_noresume(&func->dev);
328 
329         if (wl->irq)
330                 free_irq(wl->irq, wl);
331         wl1251_free_hw(wl);
332         kfree(wl_sdio);
333 
334         sdio_claim_host(func);
335         sdio_release_irq(func);
336         sdio_disable_func(func);
337         sdio_release_host(func);
338 }
339 
340 static int wl1251_suspend(struct device *dev)
341 {
342         /*
343          * Tell MMC/SDIO core it's OK to power down the card
344          * (if it isn't already), but not to remove it completely.
345          */
346         return 0;
347 }
348 
349 static int wl1251_resume(struct device *dev)
350 {
351         return 0;
352 }
353 
354 static const struct dev_pm_ops wl1251_sdio_pm_ops = {
355         .suspend        = wl1251_suspend,
356         .resume         = wl1251_resume,
357 };
358 
359 static struct sdio_driver wl1251_sdio_driver = {
360         .name           = "wl1251_sdio",
361         .id_table       = wl1251_devices,
362         .probe          = wl1251_sdio_probe,
363         .remove         = wl1251_sdio_remove,
364         .drv.pm         = &wl1251_sdio_pm_ops,
365 };
366 
367 static int __init wl1251_sdio_init(void)
368 {
369         int err;
370 
371         err = sdio_register_driver(&wl1251_sdio_driver);
372         if (err)
373                 wl1251_error("failed to register sdio driver: %d", err);
374         return err;
375 }
376 
377 static void __exit wl1251_sdio_exit(void)
378 {
379         sdio_unregister_driver(&wl1251_sdio_driver);
380         wl1251_notice("unloaded");
381 }
382 
383 module_init(wl1251_sdio_init);
384 module_exit(wl1251_sdio_exit);
385 
386 MODULE_LICENSE("GPL");
387 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
388 

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