[go: nahoru, domu]
1/*
2 * Mac80211 SDIO driver for ST-Ericsson CW1200 device
3 *
4 * Copyright (c) 2010, ST-Ericsson
5 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/gpio.h>
14#include <linux/delay.h>
15#include <linux/mmc/host.h>
16#include <linux/mmc/sdio_func.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/sdio.h>
19#include <net/mac80211.h>
20
21#include "cw1200.h"
22#include "hwbus.h"
23#include <linux/platform_data/net-cw1200.h>
24#include "hwio.h"
25
26MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>");
27MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
28MODULE_LICENSE("GPL");
29
30#define SDIO_BLOCK_SIZE (512)
31
32/* Default platform data for Sagrad modules */
33static struct cw1200_platform_data_sdio sagrad_109x_evk_platform_data = {
34	.ref_clk = 38400,
35	.have_5ghz = false,
36	.sdd_file = "sdd_sagrad_1091_1098.bin",
37};
38
39/* Allow platform data to be overridden */
40static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data;
41
42void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata)
43{
44	global_plat_data = pdata;
45}
46
47struct hwbus_priv {
48	struct sdio_func	*func;
49	struct cw1200_common	*core;
50	const struct cw1200_platform_data_sdio *pdata;
51};
52
53#ifndef SDIO_VENDOR_ID_STE
54#define SDIO_VENDOR_ID_STE		0x0020
55#endif
56
57#ifndef SDIO_DEVICE_ID_STE_CW1200
58#define SDIO_DEVICE_ID_STE_CW1200	0x2280
59#endif
60
61static const struct sdio_device_id cw1200_sdio_ids[] = {
62	{ SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) },
63	{ /* end: all zeroes */			},
64};
65
66/* hwbus_ops implemetation */
67
68static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self,
69				     unsigned int addr,
70				     void *dst, int count)
71{
72	return sdio_memcpy_fromio(self->func, dst, addr, count);
73}
74
75static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self,
76				   unsigned int addr,
77				   const void *src, int count)
78{
79	return sdio_memcpy_toio(self->func, addr, (void *)src, count);
80}
81
82static void cw1200_sdio_lock(struct hwbus_priv *self)
83{
84	sdio_claim_host(self->func);
85}
86
87static void cw1200_sdio_unlock(struct hwbus_priv *self)
88{
89	sdio_release_host(self->func);
90}
91
92static void cw1200_sdio_irq_handler(struct sdio_func *func)
93{
94	struct hwbus_priv *self = sdio_get_drvdata(func);
95
96	/* note:  sdio_host already claimed here. */
97	if (self->core)
98		cw1200_irq_handler(self->core);
99}
100
101static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
102{
103	return IRQ_WAKE_THREAD;
104}
105
106static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
107{
108	struct hwbus_priv *self = dev_id;
109
110	if (self->core) {
111		cw1200_sdio_lock(self);
112		cw1200_irq_handler(self->core);
113		cw1200_sdio_unlock(self);
114		return IRQ_HANDLED;
115	} else {
116		return IRQ_NONE;
117	}
118}
119
120static int cw1200_request_irq(struct hwbus_priv *self)
121{
122	int ret;
123	u8 cccr;
124
125	cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret);
126	if (WARN_ON(ret))
127		goto err;
128
129	/* Master interrupt enable ... */
130	cccr |= BIT(0);
131
132	/* ... for our function */
133	cccr |= BIT(self->func->num);
134
135	sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
136	if (WARN_ON(ret))
137		goto err;
138
139	ret = enable_irq_wake(self->pdata->irq);
140	if (WARN_ON(ret))
141		goto err;
142
143	/* Request the IRQ */
144	ret =  request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq,
145				    cw1200_gpio_irq,
146				    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
147				    "cw1200_wlan_irq", self);
148	if (WARN_ON(ret))
149		goto err;
150
151	return 0;
152
153err:
154	return ret;
155}
156
157static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self)
158{
159	int ret = 0;
160
161	pr_debug("SW IRQ subscribe\n");
162	sdio_claim_host(self->func);
163	if (self->pdata->irq)
164		ret = cw1200_request_irq(self);
165	else
166		ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);
167
168	sdio_release_host(self->func);
169	return ret;
170}
171
172static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self)
173{
174	int ret = 0;
175
176	pr_debug("SW IRQ unsubscribe\n");
177
178	if (self->pdata->irq) {
179		disable_irq_wake(self->pdata->irq);
180		free_irq(self->pdata->irq, self);
181	} else {
182		sdio_claim_host(self->func);
183		ret = sdio_release_irq(self->func);
184		sdio_release_host(self->func);
185	}
186	return ret;
187}
188
189static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
190{
191	if (pdata->reset) {
192		gpio_set_value(pdata->reset, 0);
193		msleep(30); /* Min is 2 * CLK32K cycles */
194		gpio_free(pdata->reset);
195	}
196
197	if (pdata->power_ctrl)
198		pdata->power_ctrl(pdata, false);
199	if (pdata->clk_ctrl)
200		pdata->clk_ctrl(pdata, false);
201
202	return 0;
203}
204
205static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
206{
207	/* Ensure I/Os are pulled low */
208	if (pdata->reset) {
209		gpio_request(pdata->reset, "cw1200_wlan_reset");
210		gpio_direction_output(pdata->reset, 0);
211	}
212	if (pdata->powerup) {
213		gpio_request(pdata->powerup, "cw1200_wlan_powerup");
214		gpio_direction_output(pdata->powerup, 0);
215	}
216	if (pdata->reset || pdata->powerup)
217		msleep(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(10); /* Delay until clock is stable for 2 cycles */
234	}
235
236	/* Enable POWERUP signal */
237	if (pdata->powerup) {
238		gpio_set_value(pdata->powerup, 1);
239		msleep(250); /* or more..? */
240	}
241	/* Enable RSTn signal */
242	if (pdata->reset) {
243		gpio_set_value(pdata->reset, 1);
244		msleep(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(self->func, 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(self->pdata->irq, suspend);
265	return ret;
266}
267
268static 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(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(&cw1200_sdio_hwbus_ops,
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
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->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
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(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