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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a910e4a9 SP |
2 | /* |
3 | * Mac80211 SDIO driver for ST-Ericsson CW1200 device | |
4 | * | |
5 | * Copyright (c) 2010, ST-Ericsson | |
6 | * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> | |
a910e4a9 SP |
7 | */ |
8 | ||
a910e4a9 | 9 | #include <linux/module.h> |
282ccf6e | 10 | #include <linux/interrupt.h> |
2719a9e7 | 11 | #include <linux/gpio/consumer.h> |
a910e4a9 SP |
12 | #include <linux/delay.h> |
13 | #include <linux/mmc/host.h> | |
14 | #include <linux/mmc/sdio_func.h> | |
15 | #include <linux/mmc/card.h> | |
16 | #include <linux/mmc/sdio.h> | |
83cee4e6 | 17 | #include <linux/mmc/sdio_ids.h> |
a910e4a9 SP |
18 | #include <net/mac80211.h> |
19 | ||
20 | #include "cw1200.h" | |
911373cc | 21 | #include "hwbus.h" |
4da2a54a | 22 | #include <linux/platform_data/net-cw1200.h> |
a910e4a9 SP |
23 | #include "hwio.h" |
24 | ||
25 | MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>"); | |
26 | MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver"); | |
27 | MODULE_LICENSE("GPL"); | |
28 | ||
29 | #define SDIO_BLOCK_SIZE (512) | |
30 | ||
7c0b6f49 SP |
31 | /* Default platform data for Sagrad modules */ |
32 | static struct cw1200_platform_data_sdio sagrad_109x_evk_platform_data = { | |
33 | .ref_clk = 38400, | |
34 | .have_5ghz = false, | |
35 | .sdd_file = "sdd_sagrad_1091_1098.bin", | |
36 | }; | |
37 | ||
38 | /* Allow platform data to be overridden */ | |
39 | static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data; | |
40 | ||
41 | void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata) | |
42 | { | |
43 | global_plat_data = pdata; | |
44 | } | |
45 | ||
911373cc | 46 | struct hwbus_priv { |
a910e4a9 SP |
47 | struct sdio_func *func; |
48 | struct cw1200_common *core; | |
49 | const struct cw1200_platform_data_sdio *pdata; | |
50 | }; | |
51 | ||
a910e4a9 SP |
52 | static const struct sdio_device_id cw1200_sdio_ids[] = { |
53 | { SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) }, | |
54 | { /* end: all zeroes */ }, | |
55 | }; | |
dd778f89 | 56 | MODULE_DEVICE_TABLE(sdio, cw1200_sdio_ids); |
a910e4a9 | 57 | |
911373cc | 58 | /* hwbus_ops implemetation */ |
a910e4a9 | 59 | |
911373cc | 60 | static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self, |
a910e4a9 SP |
61 | unsigned int addr, |
62 | void *dst, int count) | |
63 | { | |
64 | return sdio_memcpy_fromio(self->func, dst, addr, count); | |
65 | } | |
66 | ||
911373cc | 67 | static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self, |
a910e4a9 SP |
68 | unsigned int addr, |
69 | const void *src, int count) | |
70 | { | |
71 | return sdio_memcpy_toio(self->func, addr, (void *)src, count); | |
72 | } | |
73 | ||
911373cc | 74 | static void cw1200_sdio_lock(struct hwbus_priv *self) |
a910e4a9 SP |
75 | { |
76 | sdio_claim_host(self->func); | |
77 | } | |
78 | ||
911373cc | 79 | static void cw1200_sdio_unlock(struct hwbus_priv *self) |
a910e4a9 SP |
80 | { |
81 | sdio_release_host(self->func); | |
82 | } | |
83 | ||
84 | static void cw1200_sdio_irq_handler(struct sdio_func *func) | |
85 | { | |
911373cc | 86 | struct hwbus_priv *self = sdio_get_drvdata(func); |
a910e4a9 SP |
87 | |
88 | /* note: sdio_host already claimed here. */ | |
89 | if (self->core) | |
90 | cw1200_irq_handler(self->core); | |
91 | } | |
92 | ||
93 | static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id) | |
94 | { | |
95 | return IRQ_WAKE_THREAD; | |
96 | } | |
97 | ||
98 | static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id) | |
99 | { | |
911373cc | 100 | struct hwbus_priv *self = dev_id; |
a910e4a9 SP |
101 | |
102 | if (self->core) { | |
cf1ad8f9 | 103 | cw1200_sdio_lock(self); |
a910e4a9 | 104 | cw1200_irq_handler(self->core); |
cf1ad8f9 | 105 | cw1200_sdio_unlock(self); |
a910e4a9 SP |
106 | return IRQ_HANDLED; |
107 | } else { | |
108 | return IRQ_NONE; | |
109 | } | |
110 | } | |
111 | ||
911373cc | 112 | static int cw1200_request_irq(struct hwbus_priv *self) |
a910e4a9 SP |
113 | { |
114 | int ret; | |
a910e4a9 SP |
115 | u8 cccr; |
116 | ||
117 | cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret); | |
118 | if (WARN_ON(ret)) | |
119 | goto err; | |
120 | ||
121 | /* Master interrupt enable ... */ | |
122 | cccr |= BIT(0); | |
123 | ||
124 | /* ... for our function */ | |
125 | cccr |= BIT(self->func->num); | |
126 | ||
127 | sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret); | |
128 | if (WARN_ON(ret)) | |
129 | goto err; | |
130 | ||
6dd64a30 | 131 | ret = enable_irq_wake(self->pdata->irq); |
a910e4a9 SP |
132 | if (WARN_ON(ret)) |
133 | goto err; | |
134 | ||
135 | /* Request the IRQ */ | |
6dd64a30 | 136 | ret = request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq, |
a910e4a9 SP |
137 | cw1200_gpio_irq, |
138 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, | |
6dd64a30 | 139 | "cw1200_wlan_irq", self); |
a910e4a9 SP |
140 | if (WARN_ON(ret)) |
141 | goto err; | |
142 | ||
143 | return 0; | |
144 | ||
145 | err: | |
146 | return ret; | |
147 | } | |
148 | ||
911373cc | 149 | static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self) |
a910e4a9 SP |
150 | { |
151 | int ret = 0; | |
152 | ||
153 | pr_debug("SW IRQ subscribe\n"); | |
154 | sdio_claim_host(self->func); | |
155 | if (self->pdata->irq) | |
156 | ret = cw1200_request_irq(self); | |
157 | else | |
158 | ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler); | |
159 | ||
160 | sdio_release_host(self->func); | |
161 | return ret; | |
162 | } | |
163 | ||
911373cc | 164 | static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self) |
a910e4a9 SP |
165 | { |
166 | int ret = 0; | |
167 | ||
168 | pr_debug("SW IRQ unsubscribe\n"); | |
169 | ||
170 | if (self->pdata->irq) { | |
6dd64a30 SP |
171 | disable_irq_wake(self->pdata->irq); |
172 | free_irq(self->pdata->irq, self); | |
a910e4a9 SP |
173 | } else { |
174 | sdio_claim_host(self->func); | |
175 | ret = sdio_release_irq(self->func); | |
176 | sdio_release_host(self->func); | |
177 | } | |
178 | return ret; | |
179 | } | |
180 | ||
2719a9e7 LW |
181 | /* Like the rest of the driver, this only supports one device per system */ |
182 | static struct gpio_desc *cw1200_reset; | |
183 | static struct gpio_desc *cw1200_powerup; | |
184 | ||
a910e4a9 SP |
185 | static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata) |
186 | { | |
2719a9e7 LW |
187 | if (cw1200_reset) { |
188 | gpiod_set_value(cw1200_reset, 0); | |
a910e4a9 | 189 | msleep(30); /* Min is 2 * CLK32K cycles */ |
a910e4a9 SP |
190 | } |
191 | ||
192 | if (pdata->power_ctrl) | |
193 | pdata->power_ctrl(pdata, false); | |
194 | if (pdata->clk_ctrl) | |
195 | pdata->clk_ctrl(pdata, false); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata) | |
201 | { | |
2719a9e7 LW |
202 | /* Ensure I/Os are pulled low (reset is active low) */ |
203 | cw1200_reset = devm_gpiod_get_optional(NULL, "reset", GPIOD_OUT_HIGH); | |
204 | if (IS_ERR(cw1200_reset)) { | |
205 | pr_err("could not get CW1200 SDIO reset GPIO\n"); | |
206 | return PTR_ERR(cw1200_reset); | |
a910e4a9 | 207 | } |
2719a9e7 LW |
208 | gpiod_set_consumer_name(cw1200_reset, "cw1200_wlan_reset"); |
209 | cw1200_powerup = devm_gpiod_get_optional(NULL, "powerup", GPIOD_OUT_LOW); | |
210 | if (IS_ERR(cw1200_powerup)) { | |
211 | pr_err("could not get CW1200 SDIO powerup GPIO\n"); | |
212 | return PTR_ERR(cw1200_powerup); | |
a910e4a9 | 213 | } |
2719a9e7 LW |
214 | gpiod_set_consumer_name(cw1200_powerup, "cw1200_wlan_powerup"); |
215 | ||
216 | if (cw1200_reset || cw1200_powerup) | |
6dd64a30 | 217 | msleep(10); /* Settle time? */ |
a910e4a9 SP |
218 | |
219 | /* Enable 3v3 and 1v8 to hardware */ | |
220 | if (pdata->power_ctrl) { | |
221 | if (pdata->power_ctrl(pdata, true)) { | |
222 | pr_err("power_ctrl() failed!\n"); | |
223 | return -1; | |
224 | } | |
225 | } | |
226 | ||
227 | /* Enable CLK32K */ | |
228 | if (pdata->clk_ctrl) { | |
229 | if (pdata->clk_ctrl(pdata, true)) { | |
230 | pr_err("clk_ctrl() failed!\n"); | |
231 | return -1; | |
232 | } | |
233 | msleep(10); /* Delay until clock is stable for 2 cycles */ | |
234 | } | |
235 | ||
236 | /* Enable POWERUP signal */ | |
2719a9e7 LW |
237 | if (cw1200_powerup) { |
238 | gpiod_set_value(cw1200_powerup, 1); | |
a910e4a9 SP |
239 | msleep(250); /* or more..? */ |
240 | } | |
2719a9e7 LW |
241 | /* Deassert RSTn signal, note active low */ |
242 | if (cw1200_reset) { | |
243 | gpiod_set_value(cw1200_reset, 0); | |
a910e4a9 SP |
244 | msleep(50); /* Or more..? */ |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
911373cc | 249 | static size_t cw1200_sdio_align_size(struct hwbus_priv *self, size_t size) |
a910e4a9 SP |
250 | { |
251 | if (self->pdata->no_nptb) | |
252 | size = round_up(size, SDIO_BLOCK_SIZE); | |
253 | else | |
254 | size = sdio_align_size(self->func, size); | |
255 | ||
256 | return size; | |
257 | } | |
258 | ||
911373cc | 259 | static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend) |
a910e4a9 SP |
260 | { |
261 | int ret = 0; | |
262 | ||
263 | if (self->pdata->irq) | |
6dd64a30 | 264 | ret = irq_set_irq_wake(self->pdata->irq, suspend); |
a910e4a9 SP |
265 | return ret; |
266 | } | |
267 | ||
3ac27dd3 | 268 | static const struct hwbus_ops cw1200_sdio_hwbus_ops = { |
911373cc SP |
269 | .hwbus_memcpy_fromio = cw1200_sdio_memcpy_fromio, |
270 | .hwbus_memcpy_toio = cw1200_sdio_memcpy_toio, | |
a910e4a9 SP |
271 | .lock = cw1200_sdio_lock, |
272 | .unlock = cw1200_sdio_unlock, | |
273 | .align_size = cw1200_sdio_align_size, | |
274 | .power_mgmt = cw1200_sdio_pm, | |
275 | }; | |
276 | ||
277 | /* Probe Function to be called by SDIO stack when device is discovered */ | |
278 | static int cw1200_sdio_probe(struct sdio_func *func, | |
7c0b6f49 | 279 | const struct sdio_device_id *id) |
a910e4a9 | 280 | { |
911373cc | 281 | struct hwbus_priv *self; |
a910e4a9 SP |
282 | int status; |
283 | ||
284 | pr_info("cw1200_wlan_sdio: Probe called\n"); | |
285 | ||
6dd64a30 | 286 | /* We are only able to handle the wlan function */ |
a910e4a9 SP |
287 | if (func->num != 0x01) |
288 | return -ENODEV; | |
289 | ||
290 | self = kzalloc(sizeof(*self), GFP_KERNEL); | |
291 | if (!self) { | |
911373cc | 292 | pr_err("Can't allocate SDIO hwbus_priv.\n"); |
a910e4a9 SP |
293 | return -ENOMEM; |
294 | } | |
295 | ||
296 | func->card->quirks |= MMC_QUIRK_LENIENT_FN0; | |
297 | ||
7c0b6f49 | 298 | self->pdata = global_plat_data; /* FIXME */ |
a910e4a9 SP |
299 | self->func = func; |
300 | sdio_set_drvdata(func, self); | |
301 | sdio_claim_host(func); | |
302 | sdio_enable_func(func); | |
303 | sdio_release_host(func); | |
304 | ||
305 | status = cw1200_sdio_irq_subscribe(self); | |
306 | ||
911373cc | 307 | status = cw1200_core_probe(&cw1200_sdio_hwbus_ops, |
a910e4a9 SP |
308 | self, &func->dev, &self->core, |
309 | self->pdata->ref_clk, | |
310 | self->pdata->macaddr, | |
311 | self->pdata->sdd_file, | |
312 | self->pdata->have_5ghz); | |
313 | if (status) { | |
314 | cw1200_sdio_irq_unsubscribe(self); | |
315 | sdio_claim_host(func); | |
316 | sdio_disable_func(func); | |
317 | sdio_release_host(func); | |
318 | sdio_set_drvdata(func, NULL); | |
319 | kfree(self); | |
320 | } | |
321 | ||
322 | return status; | |
323 | } | |
324 | ||
325 | /* Disconnect Function to be called by SDIO stack when | |
8b3e7be4 SP |
326 | * device is disconnected |
327 | */ | |
a910e4a9 SP |
328 | static void cw1200_sdio_disconnect(struct sdio_func *func) |
329 | { | |
911373cc | 330 | struct hwbus_priv *self = sdio_get_drvdata(func); |
a910e4a9 SP |
331 | |
332 | if (self) { | |
333 | cw1200_sdio_irq_unsubscribe(self); | |
334 | if (self->core) { | |
335 | cw1200_core_release(self->core); | |
336 | self->core = NULL; | |
337 | } | |
338 | sdio_claim_host(func); | |
339 | sdio_disable_func(func); | |
340 | sdio_release_host(func); | |
341 | sdio_set_drvdata(func, NULL); | |
342 | kfree(self); | |
343 | } | |
344 | } | |
345 | ||
4e17b87e | 346 | #ifdef CONFIG_PM |
a910e4a9 SP |
347 | static int cw1200_sdio_suspend(struct device *dev) |
348 | { | |
349 | int ret; | |
350 | struct sdio_func *func = dev_to_sdio_func(dev); | |
911373cc | 351 | struct hwbus_priv *self = sdio_get_drvdata(func); |
a910e4a9 SP |
352 | |
353 | if (!cw1200_can_suspend(self->core)) | |
354 | return -EAGAIN; | |
355 | ||
356 | /* Notify SDIO that CW1200 will remain powered during suspend */ | |
357 | ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); | |
358 | if (ret) | |
359 | pr_err("Error setting SDIO pm flags: %i\n", ret); | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
364 | static int cw1200_sdio_resume(struct device *dev) | |
365 | { | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static const struct dev_pm_ops cw1200_pm_ops = { | |
370 | .suspend = cw1200_sdio_suspend, | |
371 | .resume = cw1200_sdio_resume, | |
372 | }; | |
4e17b87e | 373 | #endif |
a910e4a9 SP |
374 | |
375 | static struct sdio_driver sdio_driver = { | |
376 | .name = "cw1200_wlan_sdio", | |
377 | .id_table = cw1200_sdio_ids, | |
378 | .probe = cw1200_sdio_probe, | |
379 | .remove = cw1200_sdio_disconnect, | |
4e17b87e | 380 | #ifdef CONFIG_PM |
a910e4a9 SP |
381 | .drv = { |
382 | .pm = &cw1200_pm_ops, | |
383 | } | |
4e17b87e | 384 | #endif |
a910e4a9 SP |
385 | }; |
386 | ||
387 | /* Init Module function -> Called by insmod */ | |
388 | static int __init cw1200_sdio_init(void) | |
389 | { | |
390 | const struct cw1200_platform_data_sdio *pdata; | |
391 | int ret; | |
392 | ||
7c0b6f49 SP |
393 | /* FIXME -- this won't support multiple devices */ |
394 | pdata = global_plat_data; | |
a910e4a9 SP |
395 | |
396 | if (cw1200_sdio_on(pdata)) { | |
397 | ret = -1; | |
398 | goto err; | |
399 | } | |
400 | ||
401 | ret = sdio_register_driver(&sdio_driver); | |
402 | if (ret) | |
403 | goto err; | |
404 | ||
405 | return 0; | |
406 | ||
407 | err: | |
408 | cw1200_sdio_off(pdata); | |
409 | return ret; | |
410 | } | |
411 | ||
412 | /* Called at Driver Unloading */ | |
413 | static void __exit cw1200_sdio_exit(void) | |
414 | { | |
415 | const struct cw1200_platform_data_sdio *pdata; | |
7c0b6f49 SP |
416 | |
417 | /* FIXME -- this won't support multiple devices */ | |
418 | pdata = global_plat_data; | |
a910e4a9 SP |
419 | sdio_unregister_driver(&sdio_driver); |
420 | cw1200_sdio_off(pdata); | |
421 | } | |
422 | ||
423 | ||
424 | module_init(cw1200_sdio_init); | |
425 | module_exit(cw1200_sdio_exit); |