summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/cw1200/cw1200_sdio.c
blob: 0a882ca89bbbe1365d34b77a8c0539f7bb63d85d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
/*
 * Mac80211 SDIO driver for ST-Ericsson CW1200 device
 *
 * Copyright (c) 2010, ST-Ericsson
 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio.h>
#include <net/mac80211.h>

#include "cw1200.h"
#include "hwbus.h"
#include <linux/platform_data/cw1200_platform.h>
#include "hwio.h"

MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>");
MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
MODULE_LICENSE("GPL");

#define SDIO_BLOCK_SIZE (512)

struct hwbus_priv {
	struct sdio_func	*func;
	struct cw1200_common	*core;
	const struct cw1200_platform_data_sdio *pdata;
};

#ifndef SDIO_VENDOR_ID_STE
#define SDIO_VENDOR_ID_STE		0x0020
#endif

#ifndef SDIO_DEVICE_ID_STE_CW1200
#define SDIO_DEVICE_ID_STE_CW1200	0x2280
#endif

static const struct sdio_device_id cw1200_sdio_ids[] = {
	{ SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) },
	{ /* end: all zeroes */			},
};

/* hwbus_ops implemetation */

static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self,
				     unsigned int addr,
				     void *dst, int count)
{
	return sdio_memcpy_fromio(self->func, dst, addr, count);
}

static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self,
				   unsigned int addr,
				   const void *src, int count)
{
	return sdio_memcpy_toio(self->func, addr, (void *)src, count);
}

static void cw1200_sdio_lock(struct hwbus_priv *self)
{
	sdio_claim_host(self->func);
}

static void cw1200_sdio_unlock(struct hwbus_priv *self)
{
	sdio_release_host(self->func);
}

static void cw1200_sdio_irq_handler(struct sdio_func *func)
{
	struct hwbus_priv *self = sdio_get_drvdata(func);

	/* note:  sdio_host already claimed here. */
	if (self->core)
		cw1200_irq_handler(self->core);
}

static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
{
	return IRQ_WAKE_THREAD;
}

static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
{
	struct hwbus_priv *self = dev_id;

	if (self->core) {
		sdio_claim_host(self->func);
		cw1200_irq_handler(self->core);
		sdio_release_host(self->func);
		return IRQ_HANDLED;
	} else {
		return IRQ_NONE;
	}
}

static int cw1200_request_irq(struct hwbus_priv *self)
{
	int ret;
	const struct resource *irq = self->pdata->irq;
	u8 cccr;

	cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret);
	if (WARN_ON(ret))
		goto err;

	/* Master interrupt enable ... */
	cccr |= BIT(0);

	/* ... for our function */
	cccr |= BIT(self->func->num);

	sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
	if (WARN_ON(ret))
		goto err;

	ret = enable_irq_wake(irq->start);
	if (WARN_ON(ret))
		goto err;

	/* Request the IRQ */
	ret =  request_threaded_irq(irq->start, cw1200_gpio_hardirq,
				    cw1200_gpio_irq,
				    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
				    irq->name, self);
	if (WARN_ON(ret))
		goto err;

	return 0;

err:
	return ret;
}

static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self)
{
	int ret = 0;

	pr_debug("SW IRQ subscribe\n");
	sdio_claim_host(self->func);
	if (self->pdata->irq)
		ret = cw1200_request_irq(self);
	else
		ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);

	sdio_release_host(self->func);
	return ret;
}

static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self)
{
	int ret = 0;

	pr_debug("SW IRQ unsubscribe\n");

	if (self->pdata->irq) {
		disable_irq_wake(self->pdata->irq->start);
		free_irq(self->pdata->irq->start, self);
	} else {
		sdio_claim_host(self->func);
		ret = sdio_release_irq(self->func);
		sdio_release_host(self->func);
	}
	return ret;
}

static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
{
	const struct resource *reset = pdata->reset;

	if (reset) {
		gpio_set_value(reset->start, 0);
		msleep(30); /* Min is 2 * CLK32K cycles */
		gpio_free(reset->start);
	}

	if (pdata->power_ctrl)
		pdata->power_ctrl(pdata, false);
	if (pdata->clk_ctrl)
		pdata->clk_ctrl(pdata, false);

	return 0;
}

static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
{
	const struct resource *reset = pdata->reset;
	const struct resource *powerup = pdata->powerup;

	/* Ensure I/Os are pulled low */
	if (reset) {
		gpio_request(reset->start, reset->name);
		gpio_direction_output(reset->start, 0);
	}
	if (powerup) {
		gpio_request(powerup->start, powerup->name);
		gpio_direction_output(powerup->start, 0);
	}
	if (reset || powerup)
		msleep(50); /* Settle time */

	/* Enable 3v3 and 1v8 to hardware */
	if (pdata->power_ctrl) {
		if (pdata->power_ctrl(pdata, true)) {
			pr_err("power_ctrl() failed!\n");
			return -1;
		}
	}

	/* Enable CLK32K */
	if (pdata->clk_ctrl) {
		if (pdata->clk_ctrl(pdata, true)) {
			pr_err("clk_ctrl() failed!\n");
			return -1;
		}
		msleep(10); /* Delay until clock is stable for 2 cycles */
	}

	/* Enable POWERUP signal */
	if (powerup) {
		gpio_set_value(powerup->start, 1);
		msleep(250); /* or more..? */
	}
	/* Enable RSTn signal */
	if (reset) {
		gpio_set_value(reset->start, 1);
		msleep(50); /* Or more..? */
	}
	return 0;
}

static size_t cw1200_sdio_align_size(struct hwbus_priv *self, size_t size)
{
	if (self->pdata->no_nptb)
		size = round_up(size, SDIO_BLOCK_SIZE);
	else
		size = sdio_align_size(self->func, size);

	return size;
}

static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend)
{
	int ret = 0;

	if (self->pdata->irq)
		ret = irq_set_irq_wake(self->pdata->irq->start, suspend);
	return ret;
}

static struct hwbus_ops cw1200_sdio_hwbus_ops = {
	.hwbus_memcpy_fromio	= cw1200_sdio_memcpy_fromio,
	.hwbus_memcpy_toio	= cw1200_sdio_memcpy_toio,
	.lock			= cw1200_sdio_lock,
	.unlock			= cw1200_sdio_unlock,
	.align_size		= cw1200_sdio_align_size,
	.power_mgmt		= cw1200_sdio_pm,
};

/* Probe Function to be called by SDIO stack when device is discovered */
static int cw1200_sdio_probe(struct sdio_func *func,
				       const struct sdio_device_id *id)
{
	struct hwbus_priv *self;
	int status;

	pr_info("cw1200_wlan_sdio: Probe called\n");

       /* We are only able to handle the wlan function */
	if (func->num != 0x01)
		return -ENODEV;

	self = kzalloc(sizeof(*self), GFP_KERNEL);
	if (!self) {
		pr_err("Can't allocate SDIO hwbus_priv.\n");
		return -ENOMEM;
	}

	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;

	self->pdata = cw1200_get_platform_data();
	self->func = func;
	sdio_set_drvdata(func, self);
	sdio_claim_host(func);
	sdio_enable_func(func);
	sdio_release_host(func);

	status = cw1200_sdio_irq_subscribe(self);

	status = cw1200_core_probe(&cw1200_sdio_hwbus_ops,
				   self, &func->dev, &self->core,
				   self->pdata->ref_clk,
				   self->pdata->macaddr,
				   self->pdata->sdd_file,
				   self->pdata->have_5ghz);
	if (status) {
		cw1200_sdio_irq_unsubscribe(self);
		sdio_claim_host(func);
		sdio_disable_func(func);
		sdio_release_host(func);
		sdio_set_drvdata(func, NULL);
		kfree(self);
	}

	return status;
}

/* Disconnect Function to be called by SDIO stack when
 * device is disconnected */
static void cw1200_sdio_disconnect(struct sdio_func *func)
{
	struct hwbus_priv *self = sdio_get_drvdata(func);

	if (self) {
		cw1200_sdio_irq_unsubscribe(self);
		if (self->core) {
			cw1200_core_release(self->core);
			self->core = NULL;
		}
		sdio_claim_host(func);
		sdio_disable_func(func);
		sdio_release_host(func);
		sdio_set_drvdata(func, NULL);
		kfree(self);
	}
}

#ifdef CONFIG_PM
static int cw1200_sdio_suspend(struct device *dev)
{
	int ret;
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct hwbus_priv *self = sdio_get_drvdata(func);

	if (!cw1200_can_suspend(self->core))
		return -EAGAIN;

	/* Notify SDIO that CW1200 will remain powered during suspend */
	ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
	if (ret)
		pr_err("Error setting SDIO pm flags: %i\n", ret);

	return ret;
}

static int cw1200_sdio_resume(struct device *dev)
{
	return 0;
}

static const struct dev_pm_ops cw1200_pm_ops = {
	.suspend = cw1200_sdio_suspend,
	.resume = cw1200_sdio_resume,
};
#endif

static struct sdio_driver sdio_driver = {
	.name		= "cw1200_wlan_sdio",
	.id_table	= cw1200_sdio_ids,
	.probe		= cw1200_sdio_probe,
	.remove		= cw1200_sdio_disconnect,
#ifdef CONFIG_PM
	.drv = {
		.pm = &cw1200_pm_ops,
	}
#endif
};

/* Init Module function -> Called by insmod */
static int __init cw1200_sdio_init(void)
{
	const struct cw1200_platform_data_sdio *pdata;
	int ret;

	pdata = cw1200_get_platform_data();

	if (cw1200_sdio_on(pdata)) {
		ret = -1;
		goto err;
	}

	ret = sdio_register_driver(&sdio_driver);
	if (ret)
		goto err;

	return 0;

err:
	cw1200_sdio_off(pdata);
	return ret;
}

/* Called at Driver Unloading */
static void __exit cw1200_sdio_exit(void)
{
	const struct cw1200_platform_data_sdio *pdata;
	pdata = cw1200_get_platform_data();
	sdio_unregister_driver(&sdio_driver);
	cw1200_sdio_off(pdata);
}


module_init(cw1200_sdio_init);
module_exit(cw1200_sdio_exit);