1 // SPDX-License-Identifier: GPL-2.0-only
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>
7 */
8
9 #include <linux/module.h>
10 #include <linux/interrupt.h>
11 #include <linux/gpio.h>
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>
17 #include <linux/mmc/sdio_ids.h>
18 #include <net/mac80211.h>
19
20 #include "cw1200.h"
21 #include "hwbus.h"
22 #include <linux/platform_data/net-cw1200.h>
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
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
cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio * pdata)41 void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata)
42 {
43 global_plat_data = pdata;
44 }
45
46 struct hwbus_priv {
47 struct sdio_func *func;
48 struct cw1200_common *core;
49 const struct cw1200_platform_data_sdio *pdata;
50 };
51
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 };
56 MODULE_DEVICE_TABLE(sdio, cw1200_sdio_ids);
57
58 /* hwbus_ops implemetation */
59
cw1200_sdio_memcpy_fromio(struct hwbus_priv * self,unsigned int addr,void * dst,int count)60 static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self,
61 unsigned int addr,
62 void *dst, int count)
63 {
64 return sdio_memcpy_fromio(self->func, dst, addr, count);
65 }
66
cw1200_sdio_memcpy_toio(struct hwbus_priv * self,unsigned int addr,const void * src,int count)67 static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self,
68 unsigned int addr,
69 const void *src, int count)
70 {
71 return sdio_memcpy_toio(self->func, addr, (void *)src, count);
72 }
73
cw1200_sdio_lock(struct hwbus_priv * self)74 static void cw1200_sdio_lock(struct hwbus_priv *self)
75 {
76 sdio_claim_host(self->func);
77 }
78
cw1200_sdio_unlock(struct hwbus_priv * self)79 static void cw1200_sdio_unlock(struct hwbus_priv *self)
80 {
81 sdio_release_host(self->func);
82 }
83
cw1200_sdio_irq_handler(struct sdio_func * func)84 static void cw1200_sdio_irq_handler(struct sdio_func *func)
85 {
86 struct hwbus_priv *self = sdio_get_drvdata(func);
87
88 /* note: sdio_host already claimed here. */
89 if (self->core)
90 cw1200_irq_handler(self->core);
91 }
92
cw1200_gpio_hardirq(int irq,void * dev_id)93 static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
94 {
95 return IRQ_WAKE_THREAD;
96 }
97
cw1200_gpio_irq(int irq,void * dev_id)98 static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
99 {
100 struct hwbus_priv *self = dev_id;
101
102 if (self->core) {
103 cw1200_sdio_lock(self);
104 cw1200_irq_handler(self->core);
105 cw1200_sdio_unlock(self);
106 return IRQ_HANDLED;
107 } else {
108 return IRQ_NONE;
109 }
110 }
111
cw1200_request_irq(struct hwbus_priv * self)112 static int cw1200_request_irq(struct hwbus_priv *self)
113 {
114 int ret;
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
131 ret = enable_irq_wake(self->pdata->irq);
132 if (WARN_ON(ret))
133 goto err;
134
135 /* Request the IRQ */
136 ret = request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq,
137 cw1200_gpio_irq,
138 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
139 "cw1200_wlan_irq", self);
140 if (WARN_ON(ret))
141 goto err;
142
143 return 0;
144
145 err:
146 return ret;
147 }
148
cw1200_sdio_irq_subscribe(struct hwbus_priv * self)149 static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self)
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
cw1200_sdio_irq_unsubscribe(struct hwbus_priv * self)164 static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self)
165 {
166 int ret = 0;
167
168 pr_debug("SW IRQ unsubscribe\n");
169
170 if (self->pdata->irq) {
171 disable_irq_wake(self->pdata->irq);
172 free_irq(self->pdata->irq, self);
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
cw1200_sdio_off(const struct cw1200_platform_data_sdio * pdata)181 static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
182 {
183 if (pdata->reset) {
184 gpio_set_value(pdata->reset, 0);
185 msleep(30); /* Min is 2 * CLK32K cycles */
186 gpio_free(pdata->reset);
187 }
188
189 if (pdata->power_ctrl)
190 pdata->power_ctrl(pdata, false);
191 if (pdata->clk_ctrl)
192 pdata->clk_ctrl(pdata, false);
193
194 return 0;
195 }
196
cw1200_sdio_on(const struct cw1200_platform_data_sdio * pdata)197 static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
198 {
199 /* Ensure I/Os are pulled low */
200 if (pdata->reset) {
201 gpio_request(pdata->reset, "cw1200_wlan_reset");
202 gpio_direction_output(pdata->reset, 0);
203 }
204 if (pdata->powerup) {
205 gpio_request(pdata->powerup, "cw1200_wlan_powerup");
206 gpio_direction_output(pdata->powerup, 0);
207 }
208 if (pdata->reset || pdata->powerup)
209 msleep(10); /* 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 (pdata->powerup) {
230 gpio_set_value(pdata->powerup, 1);
231 msleep(250); /* or more..? */
232 }
233 /* Enable RSTn signal */
234 if (pdata->reset) {
235 gpio_set_value(pdata->reset, 1);
236 msleep(50); /* Or more..? */
237 }
238 return 0;
239 }
240
cw1200_sdio_align_size(struct hwbus_priv * self,size_t size)241 static size_t cw1200_sdio_align_size(struct hwbus_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
cw1200_sdio_pm(struct hwbus_priv * self,bool suspend)251 static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend)
252 {
253 int ret = 0;
254
255 if (self->pdata->irq)
256 ret = irq_set_irq_wake(self->pdata->irq, suspend);
257 return ret;
258 }
259
260 static const struct hwbus_ops cw1200_sdio_hwbus_ops = {
261 .hwbus_memcpy_fromio = cw1200_sdio_memcpy_fromio,
262 .hwbus_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 */
cw1200_sdio_probe(struct sdio_func * func,const struct sdio_device_id * id)270 static int cw1200_sdio_probe(struct sdio_func *func,
271 const struct sdio_device_id *id)
272 {
273 struct hwbus_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 hwbus_priv.\n");
285 return -ENOMEM;
286 }
287
288 func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
289
290 self->pdata = global_plat_data; /* FIXME */
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_hwbus_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 */
cw1200_sdio_disconnect(struct sdio_func * func)320 static void cw1200_sdio_disconnect(struct sdio_func *func)
321 {
322 struct hwbus_priv *self = sdio_get_drvdata(func);
323
324 if (self) {
325 cw1200_sdio_irq_unsubscribe(self);
326 if (self->core) {
327 cw1200_core_release(self->core);
328 self->core = NULL;
329 }
330 sdio_claim_host(func);
331 sdio_disable_func(func);
332 sdio_release_host(func);
333 sdio_set_drvdata(func, NULL);
334 kfree(self);
335 }
336 }
337
338 #ifdef CONFIG_PM
cw1200_sdio_suspend(struct device * dev)339 static int cw1200_sdio_suspend(struct device *dev)
340 {
341 int ret;
342 struct sdio_func *func = dev_to_sdio_func(dev);
343 struct hwbus_priv *self = sdio_get_drvdata(func);
344
345 if (!cw1200_can_suspend(self->core))
346 return -EAGAIN;
347
348 /* Notify SDIO that CW1200 will remain powered during suspend */
349 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
350 if (ret)
351 pr_err("Error setting SDIO pm flags: %i\n", ret);
352
353 return ret;
354 }
355
cw1200_sdio_resume(struct device * dev)356 static int cw1200_sdio_resume(struct device *dev)
357 {
358 return 0;
359 }
360
361 static const struct dev_pm_ops cw1200_pm_ops = {
362 .suspend = cw1200_sdio_suspend,
363 .resume = cw1200_sdio_resume,
364 };
365 #endif
366
367 static struct sdio_driver sdio_driver = {
368 .name = "cw1200_wlan_sdio",
369 .id_table = cw1200_sdio_ids,
370 .probe = cw1200_sdio_probe,
371 .remove = cw1200_sdio_disconnect,
372 #ifdef CONFIG_PM
373 .drv = {
374 .pm = &cw1200_pm_ops,
375 }
376 #endif
377 };
378
379 /* Init Module function -> Called by insmod */
cw1200_sdio_init(void)380 static int __init cw1200_sdio_init(void)
381 {
382 const struct cw1200_platform_data_sdio *pdata;
383 int ret;
384
385 /* FIXME -- this won't support multiple devices */
386 pdata = global_plat_data;
387
388 if (cw1200_sdio_on(pdata)) {
389 ret = -1;
390 goto err;
391 }
392
393 ret = sdio_register_driver(&sdio_driver);
394 if (ret)
395 goto err;
396
397 return 0;
398
399 err:
400 cw1200_sdio_off(pdata);
401 return ret;
402 }
403
404 /* Called at Driver Unloading */
cw1200_sdio_exit(void)405 static void __exit cw1200_sdio_exit(void)
406 {
407 const struct cw1200_platform_data_sdio *pdata;
408
409 /* FIXME -- this won't support multiple devices */
410 pdata = global_plat_data;
411 sdio_unregister_driver(&sdio_driver);
412 cw1200_sdio_off(pdata);
413 }
414
415
416 module_init(cw1200_sdio_init);
417 module_exit(cw1200_sdio_exit);
418