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/consumer.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
25MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>");
26MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
27MODULE_LICENSE("GPL");
28
29#define SDIO_BLOCK_SIZE (512)
30
31/* Default platform data for Sagrad modules */
32static 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 */
39static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data;
40
41void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata)
42{
43 global_plat_data = pdata;
44}
45
46struct hwbus_priv {
47 struct sdio_func *func;
48 struct cw1200_common *core;
49 const struct cw1200_platform_data_sdio *pdata;
50};
51
52static 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};
56MODULE_DEVICE_TABLE(sdio, cw1200_sdio_ids);
57
58/* hwbus_ops implemetation */
59
60static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self,
61 unsigned int addr,
62 void *dst, int count)
63{
64 return sdio_memcpy_fromio(func: self->func, dst, addr, count);
65}
66
67static 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(func: self->func, addr, src: (void *)src, count);
72}
73
74static void cw1200_sdio_lock(struct hwbus_priv *self)
75{
76 sdio_claim_host(func: self->func);
77}
78
79static void cw1200_sdio_unlock(struct hwbus_priv *self)
80{
81 sdio_release_host(func: self->func);
82}
83
84static 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(priv: self->core);
91}
92
93static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
94{
95 return IRQ_WAKE_THREAD;
96}
97
98static 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(priv: self->core);
105 cw1200_sdio_unlock(self);
106 return IRQ_HANDLED;
107 } else {
108 return IRQ_NONE;
109 }
110}
111
112static int cw1200_request_irq(struct hwbus_priv *self)
113{
114 int ret;
115 u8 cccr;
116
117 cccr = sdio_f0_readb(func: self->func, SDIO_CCCR_IENx, err_ret: &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(func: self->func, b: cccr, SDIO_CCCR_IENx, err_ret: &ret);
128 if (WARN_ON(ret))
129 goto err;
130
131 ret = enable_irq_wake(irq: self->pdata->irq);
132 if (WARN_ON(ret))
133 goto err;
134
135 /* Request the IRQ */
136 ret = request_threaded_irq(irq: self->pdata->irq, handler: cw1200_gpio_hardirq,
137 thread_fn: cw1200_gpio_irq,
138 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
139 name: "cw1200_wlan_irq", dev: self);
140 if (WARN_ON(ret))
141 goto err;
142
143 return 0;
144
145err:
146 return ret;
147}
148
149static 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(func: self->func);
155 if (self->pdata->irq)
156 ret = cw1200_request_irq(self);
157 else
158 ret = sdio_claim_irq(func: self->func, handler: cw1200_sdio_irq_handler);
159
160 sdio_release_host(func: self->func);
161 return ret;
162}
163
164static 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(irq: self->pdata->irq);
172 free_irq(self->pdata->irq, self);
173 } else {
174 sdio_claim_host(func: self->func);
175 ret = sdio_release_irq(func: self->func);
176 sdio_release_host(func: self->func);
177 }
178 return ret;
179}
180
181/* Like the rest of the driver, this only supports one device per system */
182static struct gpio_desc *cw1200_reset;
183static struct gpio_desc *cw1200_powerup;
184
185static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
186{
187 if (cw1200_reset) {
188 gpiod_set_value(desc: cw1200_reset, value: 0);
189 msleep(msecs: 30); /* Min is 2 * CLK32K cycles */
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
200static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
201{
202 /* Ensure I/Os are pulled low (reset is active low) */
203 cw1200_reset = devm_gpiod_get_optional(NULL, con_id: "reset", flags: GPIOD_OUT_HIGH);
204 if (IS_ERR(ptr: cw1200_reset)) {
205 pr_err("could not get CW1200 SDIO reset GPIO\n");
206 return PTR_ERR(ptr: cw1200_reset);
207 }
208 gpiod_set_consumer_name(desc: cw1200_reset, name: "cw1200_wlan_reset");
209 cw1200_powerup = devm_gpiod_get_optional(NULL, con_id: "powerup", flags: GPIOD_OUT_LOW);
210 if (IS_ERR(ptr: cw1200_powerup)) {
211 pr_err("could not get CW1200 SDIO powerup GPIO\n");
212 return PTR_ERR(ptr: cw1200_powerup);
213 }
214 gpiod_set_consumer_name(desc: cw1200_powerup, name: "cw1200_wlan_powerup");
215
216 if (cw1200_reset || cw1200_powerup)
217 msleep(msecs: 10); /* Settle time? */
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(msecs: 10); /* Delay until clock is stable for 2 cycles */
234 }
235
236 /* Enable POWERUP signal */
237 if (cw1200_powerup) {
238 gpiod_set_value(desc: cw1200_powerup, value: 1);
239 msleep(msecs: 250); /* or more..? */
240 }
241 /* Deassert RSTn signal, note active low */
242 if (cw1200_reset) {
243 gpiod_set_value(desc: cw1200_reset, value: 0);
244 msleep(msecs: 50); /* Or more..? */
245 }
246 return 0;
247}
248
249static size_t cw1200_sdio_align_size(struct hwbus_priv *self, size_t size)
250{
251 if (self->pdata->no_nptb)
252 size = round_up(size, SDIO_BLOCK_SIZE);
253 else
254 size = sdio_align_size(func: self->func, sz: size);
255
256 return size;
257}
258
259static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend)
260{
261 int ret = 0;
262
263 if (self->pdata->irq)
264 ret = irq_set_irq_wake(irq: self->pdata->irq, on: suspend);
265 return ret;
266}
267
268static const struct hwbus_ops cw1200_sdio_hwbus_ops = {
269 .hwbus_memcpy_fromio = cw1200_sdio_memcpy_fromio,
270 .hwbus_memcpy_toio = cw1200_sdio_memcpy_toio,
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 */
278static int cw1200_sdio_probe(struct sdio_func *func,
279 const struct sdio_device_id *id)
280{
281 struct hwbus_priv *self;
282 int status;
283
284 pr_info("cw1200_wlan_sdio: Probe called\n");
285
286 /* We are only able to handle the wlan function */
287 if (func->num != 0x01)
288 return -ENODEV;
289
290 self = kzalloc(size: sizeof(*self), GFP_KERNEL);
291 if (!self) {
292 pr_err("Can't allocate SDIO hwbus_priv.\n");
293 return -ENOMEM;
294 }
295
296 func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
297
298 self->pdata = global_plat_data; /* FIXME */
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
307 status = cw1200_core_probe(hwbus_ops: &cw1200_sdio_hwbus_ops,
308 hwbus: self, pdev: &func->dev, pself: &self->core,
309 ref_clk: self->pdata->ref_clk,
310 macaddr: self->pdata->macaddr,
311 sdd_path: self->pdata->sdd_file,
312 have_5ghz: 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(objp: self);
320 }
321
322 return status;
323}
324
325/* Disconnect Function to be called by SDIO stack when
326 * device is disconnected
327 */
328static void cw1200_sdio_disconnect(struct sdio_func *func)
329{
330 struct hwbus_priv *self = sdio_get_drvdata(func);
331
332 if (self) {
333 cw1200_sdio_irq_unsubscribe(self);
334 if (self->core) {
335 cw1200_core_release(self: 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(objp: self);
343 }
344}
345
346#ifdef CONFIG_PM
347static int cw1200_sdio_suspend(struct device *dev)
348{
349 int ret;
350 struct sdio_func *func = dev_to_sdio_func(dev);
351 struct hwbus_priv *self = sdio_get_drvdata(func);
352
353 if (!cw1200_can_suspend(priv: 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
364static int cw1200_sdio_resume(struct device *dev)
365{
366 return 0;
367}
368
369static const struct dev_pm_ops cw1200_pm_ops = {
370 .suspend = cw1200_sdio_suspend,
371 .resume = cw1200_sdio_resume,
372};
373#endif
374
375static 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,
380#ifdef CONFIG_PM
381 .drv = {
382 .pm = &cw1200_pm_ops,
383 }
384#endif
385};
386
387/* Init Module function -> Called by insmod */
388static int __init cw1200_sdio_init(void)
389{
390 const struct cw1200_platform_data_sdio *pdata;
391 int ret;
392
393 /* FIXME -- this won't support multiple devices */
394 pdata = global_plat_data;
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
407err:
408 cw1200_sdio_off(pdata);
409 return ret;
410}
411
412/* Called at Driver Unloading */
413static void __exit cw1200_sdio_exit(void)
414{
415 const struct cw1200_platform_data_sdio *pdata;
416
417 /* FIXME -- this won't support multiple devices */
418 pdata = global_plat_data;
419 sdio_unregister_driver(&sdio_driver);
420 cw1200_sdio_off(pdata);
421}
422
423
424module_init(cw1200_sdio_init);
425module_exit(cw1200_sdio_exit);
426

source code of linux/drivers/net/wireless/st/cw1200/cw1200_sdio.c