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 
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 
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 
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 
74 static void cw1200_sdio_lock(struct hwbus_priv *self)
75 {
76 	sdio_claim_host(self->func);
77 }
78 
79 static void cw1200_sdio_unlock(struct hwbus_priv *self)
80 {
81 	sdio_release_host(self->func);
82 }
83 
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 
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 {
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 
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 
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 
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 
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 
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 
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 
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 */
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  */
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
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 
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 */
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 */
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