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a910e4a9 SP |
1 | /* |
2 | * Mac80211 SDIO driver for ST-Ericsson CW1200 device | |
3 | * | |
4 | * Copyright (c) 2010, ST-Ericsson | |
5 | * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/version.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/mmc/host.h> | |
17 | #include <linux/mmc/sdio_func.h> | |
18 | #include <linux/mmc/card.h> | |
19 | #include <linux/mmc/sdio.h> | |
20 | #include <net/mac80211.h> | |
21 | ||
22 | #include "cw1200.h" | |
23 | #include "sbus.h" | |
24 | #include <linux/cw1200_platform.h> | |
25 | #include "hwio.h" | |
26 | ||
27 | MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>"); | |
28 | MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
31 | #define SDIO_BLOCK_SIZE (512) | |
32 | ||
33 | struct sbus_priv { | |
34 | struct sdio_func *func; | |
35 | struct cw1200_common *core; | |
36 | const struct cw1200_platform_data_sdio *pdata; | |
37 | }; | |
38 | ||
39 | #ifndef SDIO_VENDOR_ID_STE | |
40 | #define SDIO_VENDOR_ID_STE 0x0020 | |
41 | #endif | |
42 | ||
43 | #ifndef SDIO_DEVICE_ID_STE_CW1200 | |
44 | #define SDIO_DEVICE_ID_STE_CW1200 0x2280 | |
45 | #endif | |
46 | ||
47 | static const struct sdio_device_id cw1200_sdio_ids[] = { | |
48 | { SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) }, | |
49 | { /* end: all zeroes */ }, | |
50 | }; | |
51 | ||
52 | /* sbus_ops implemetation */ | |
53 | ||
54 | static int cw1200_sdio_memcpy_fromio(struct sbus_priv *self, | |
55 | unsigned int addr, | |
56 | void *dst, int count) | |
57 | { | |
58 | return sdio_memcpy_fromio(self->func, dst, addr, count); | |
59 | } | |
60 | ||
61 | static int cw1200_sdio_memcpy_toio(struct sbus_priv *self, | |
62 | unsigned int addr, | |
63 | const void *src, int count) | |
64 | { | |
65 | return sdio_memcpy_toio(self->func, addr, (void *)src, count); | |
66 | } | |
67 | ||
68 | static void cw1200_sdio_lock(struct sbus_priv *self) | |
69 | { | |
70 | sdio_claim_host(self->func); | |
71 | } | |
72 | ||
73 | static void cw1200_sdio_unlock(struct sbus_priv *self) | |
74 | { | |
75 | sdio_release_host(self->func); | |
76 | } | |
77 | ||
78 | static void cw1200_sdio_irq_handler(struct sdio_func *func) | |
79 | { | |
80 | struct sbus_priv *self = sdio_get_drvdata(func); | |
81 | ||
82 | /* note: sdio_host already claimed here. */ | |
83 | if (self->core) | |
84 | cw1200_irq_handler(self->core); | |
85 | } | |
86 | ||
87 | static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id) | |
88 | { | |
89 | return IRQ_WAKE_THREAD; | |
90 | } | |
91 | ||
92 | static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id) | |
93 | { | |
94 | struct sbus_priv *self = dev_id; | |
95 | ||
96 | if (self->core) { | |
97 | sdio_claim_host(self->func); | |
98 | cw1200_irq_handler(self->core); | |
99 | sdio_release_host(self->func); | |
100 | return IRQ_HANDLED; | |
101 | } else { | |
102 | return IRQ_NONE; | |
103 | } | |
104 | } | |
105 | ||
106 | static int cw1200_request_irq(struct sbus_priv *self) | |
107 | { | |
108 | int ret; | |
109 | const struct resource *irq = self->pdata->irq; | |
110 | u8 cccr; | |
111 | ||
112 | cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret); | |
113 | if (WARN_ON(ret)) | |
114 | goto err; | |
115 | ||
116 | /* Master interrupt enable ... */ | |
117 | cccr |= BIT(0); | |
118 | ||
119 | /* ... for our function */ | |
120 | cccr |= BIT(self->func->num); | |
121 | ||
122 | sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret); | |
123 | if (WARN_ON(ret)) | |
124 | goto err; | |
125 | ||
126 | ret = enable_irq_wake(irq->start); | |
127 | if (WARN_ON(ret)) | |
128 | goto err; | |
129 | ||
130 | /* Request the IRQ */ | |
131 | ret = request_threaded_irq(irq->start, cw1200_gpio_hardirq, | |
132 | cw1200_gpio_irq, | |
133 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, | |
134 | irq->name, self); | |
135 | if (WARN_ON(ret)) | |
136 | goto err; | |
137 | ||
138 | return 0; | |
139 | ||
140 | err: | |
141 | return ret; | |
142 | } | |
143 | ||
144 | static int cw1200_sdio_irq_subscribe(struct sbus_priv *self) | |
145 | { | |
146 | int ret = 0; | |
147 | ||
148 | pr_debug("SW IRQ subscribe\n"); | |
149 | sdio_claim_host(self->func); | |
150 | if (self->pdata->irq) | |
151 | ret = cw1200_request_irq(self); | |
152 | else | |
153 | ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler); | |
154 | ||
155 | sdio_release_host(self->func); | |
156 | return ret; | |
157 | } | |
158 | ||
159 | static int cw1200_sdio_irq_unsubscribe(struct sbus_priv *self) | |
160 | { | |
161 | int ret = 0; | |
162 | ||
163 | pr_debug("SW IRQ unsubscribe\n"); | |
164 | ||
165 | if (self->pdata->irq) { | |
166 | disable_irq_wake(self->pdata->irq->start); | |
167 | free_irq(self->pdata->irq->start, self); | |
168 | } else { | |
169 | sdio_claim_host(self->func); | |
170 | ret = sdio_release_irq(self->func); | |
171 | sdio_release_host(self->func); | |
172 | } | |
173 | return ret; | |
174 | } | |
175 | ||
176 | static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata) | |
177 | { | |
178 | const struct resource *reset = pdata->reset; | |
179 | ||
180 | if (reset) { | |
181 | gpio_set_value(reset->start, 0); | |
182 | msleep(30); /* Min is 2 * CLK32K cycles */ | |
183 | gpio_free(reset->start); | |
184 | } | |
185 | ||
186 | if (pdata->power_ctrl) | |
187 | pdata->power_ctrl(pdata, false); | |
188 | if (pdata->clk_ctrl) | |
189 | pdata->clk_ctrl(pdata, false); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata) | |
195 | { | |
196 | const struct resource *reset = pdata->reset; | |
197 | const struct resource *powerup = pdata->reset; | |
198 | ||
199 | /* Ensure I/Os are pulled low */ | |
200 | if (reset) { | |
201 | gpio_request(reset->start, reset->name); | |
202 | gpio_direction_output(reset->start, 0); | |
203 | } | |
204 | if (powerup) { | |
205 | gpio_request(powerup->start, powerup->name); | |
206 | gpio_direction_output(powerup->start, 0); | |
207 | } | |
208 | if (reset || powerup) | |
209 | msleep(50); /* Settle time */ | |
210 | ||
211 | /* Enable 3v3 and 1v8 to hardware */ | |
212 | if (pdata->power_ctrl) { | |
213 | if (pdata->power_ctrl(pdata, true)) { | |
214 | pr_err("power_ctrl() failed!\n"); | |
215 | return -1; | |
216 | } | |
217 | } | |
218 | ||
219 | /* Enable CLK32K */ | |
220 | if (pdata->clk_ctrl) { | |
221 | if (pdata->clk_ctrl(pdata, true)) { | |
222 | pr_err("clk_ctrl() failed!\n"); | |
223 | return -1; | |
224 | } | |
225 | msleep(10); /* Delay until clock is stable for 2 cycles */ | |
226 | } | |
227 | ||
228 | /* Enable POWERUP signal */ | |
229 | if (powerup) { | |
230 | gpio_set_value(powerup->start, 1); | |
231 | msleep(250); /* or more..? */ | |
232 | } | |
233 | /* Enable RSTn signal */ | |
234 | if (reset) { | |
235 | gpio_set_value(reset->start, 1); | |
236 | msleep(50); /* Or more..? */ | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static size_t cw1200_sdio_align_size(struct sbus_priv *self, size_t size) | |
242 | { | |
243 | if (self->pdata->no_nptb) | |
244 | size = round_up(size, SDIO_BLOCK_SIZE); | |
245 | else | |
246 | size = sdio_align_size(self->func, size); | |
247 | ||
248 | return size; | |
249 | } | |
250 | ||
251 | static int cw1200_sdio_pm(struct sbus_priv *self, bool suspend) | |
252 | { | |
253 | int ret = 0; | |
254 | ||
255 | if (self->pdata->irq) | |
256 | ret = irq_set_irq_wake(self->pdata->irq->start, suspend); | |
257 | return ret; | |
258 | } | |
259 | ||
260 | static struct sbus_ops cw1200_sdio_sbus_ops = { | |
261 | .sbus_memcpy_fromio = cw1200_sdio_memcpy_fromio, | |
262 | .sbus_memcpy_toio = cw1200_sdio_memcpy_toio, | |
263 | .lock = cw1200_sdio_lock, | |
264 | .unlock = cw1200_sdio_unlock, | |
265 | .align_size = cw1200_sdio_align_size, | |
266 | .power_mgmt = cw1200_sdio_pm, | |
267 | }; | |
268 | ||
269 | /* Probe Function to be called by SDIO stack when device is discovered */ | |
270 | static int cw1200_sdio_probe(struct sdio_func *func, | |
271 | const struct sdio_device_id *id) | |
272 | { | |
273 | struct sbus_priv *self; | |
274 | int status; | |
275 | ||
276 | pr_info("cw1200_wlan_sdio: Probe called\n"); | |
277 | ||
278 | /* We are only able to handle the wlan function */ | |
279 | if (func->num != 0x01) | |
280 | return -ENODEV; | |
281 | ||
282 | self = kzalloc(sizeof(*self), GFP_KERNEL); | |
283 | if (!self) { | |
284 | pr_err("Can't allocate SDIO sbus_priv.\n"); | |
285 | return -ENOMEM; | |
286 | } | |
287 | ||
288 | func->card->quirks |= MMC_QUIRK_LENIENT_FN0; | |
289 | ||
290 | self->pdata = cw1200_get_platform_data(); | |
291 | self->func = func; | |
292 | sdio_set_drvdata(func, self); | |
293 | sdio_claim_host(func); | |
294 | sdio_enable_func(func); | |
295 | sdio_release_host(func); | |
296 | ||
297 | status = cw1200_sdio_irq_subscribe(self); | |
298 | ||
299 | status = cw1200_core_probe(&cw1200_sdio_sbus_ops, | |
300 | self, &func->dev, &self->core, | |
301 | self->pdata->ref_clk, | |
302 | self->pdata->macaddr, | |
303 | self->pdata->sdd_file, | |
304 | self->pdata->have_5ghz); | |
305 | if (status) { | |
306 | cw1200_sdio_irq_unsubscribe(self); | |
307 | sdio_claim_host(func); | |
308 | sdio_disable_func(func); | |
309 | sdio_release_host(func); | |
310 | sdio_set_drvdata(func, NULL); | |
311 | kfree(self); | |
312 | } | |
313 | ||
314 | return status; | |
315 | } | |
316 | ||
317 | /* Disconnect Function to be called by SDIO stack when | |
318 | * device is disconnected */ | |
319 | static void cw1200_sdio_disconnect(struct sdio_func *func) | |
320 | { | |
321 | struct sbus_priv *self = sdio_get_drvdata(func); | |
322 | ||
323 | if (self) { | |
324 | cw1200_sdio_irq_unsubscribe(self); | |
325 | if (self->core) { | |
326 | cw1200_core_release(self->core); | |
327 | self->core = NULL; | |
328 | } | |
329 | sdio_claim_host(func); | |
330 | sdio_disable_func(func); | |
331 | sdio_release_host(func); | |
332 | sdio_set_drvdata(func, NULL); | |
333 | kfree(self); | |
334 | } | |
335 | } | |
336 | ||
337 | static int cw1200_sdio_suspend(struct device *dev) | |
338 | { | |
339 | int ret; | |
340 | struct sdio_func *func = dev_to_sdio_func(dev); | |
341 | struct sbus_priv *self = sdio_get_drvdata(func); | |
342 | ||
343 | if (!cw1200_can_suspend(self->core)) | |
344 | return -EAGAIN; | |
345 | ||
346 | /* Notify SDIO that CW1200 will remain powered during suspend */ | |
347 | ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); | |
348 | if (ret) | |
349 | pr_err("Error setting SDIO pm flags: %i\n", ret); | |
350 | ||
351 | return ret; | |
352 | } | |
353 | ||
354 | static int cw1200_sdio_resume(struct device *dev) | |
355 | { | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static const struct dev_pm_ops cw1200_pm_ops = { | |
360 | .suspend = cw1200_sdio_suspend, | |
361 | .resume = cw1200_sdio_resume, | |
362 | }; | |
363 | ||
364 | static struct sdio_driver sdio_driver = { | |
365 | .name = "cw1200_wlan_sdio", | |
366 | .id_table = cw1200_sdio_ids, | |
367 | .probe = cw1200_sdio_probe, | |
368 | .remove = cw1200_sdio_disconnect, | |
369 | .drv = { | |
370 | .pm = &cw1200_pm_ops, | |
371 | } | |
372 | }; | |
373 | ||
374 | /* Init Module function -> Called by insmod */ | |
375 | static int __init cw1200_sdio_init(void) | |
376 | { | |
377 | const struct cw1200_platform_data_sdio *pdata; | |
378 | int ret; | |
379 | ||
380 | pdata = cw1200_get_platform_data(); | |
381 | ||
382 | if (cw1200_sdio_on(pdata)) { | |
383 | ret = -1; | |
384 | goto err; | |
385 | } | |
386 | ||
387 | ret = sdio_register_driver(&sdio_driver); | |
388 | if (ret) | |
389 | goto err; | |
390 | ||
391 | return 0; | |
392 | ||
393 | err: | |
394 | cw1200_sdio_off(pdata); | |
395 | return ret; | |
396 | } | |
397 | ||
398 | /* Called at Driver Unloading */ | |
399 | static void __exit cw1200_sdio_exit(void) | |
400 | { | |
401 | const struct cw1200_platform_data_sdio *pdata; | |
402 | pdata = cw1200_get_platform_data(); | |
403 | sdio_unregister_driver(&sdio_driver); | |
404 | cw1200_sdio_off(pdata); | |
405 | } | |
406 | ||
407 | ||
408 | module_init(cw1200_sdio_init); | |
409 | module_exit(cw1200_sdio_exit); |