1/*
  2 * wl12xx SDIO routines
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License version 2 as
  6 * published by the Free Software Foundation.
  7 *
  8 * This program is distributed in the hope that it will be useful, but
  9 * WITHOUT ANY WARRANTY; without even the implied warranty of
 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11 * General Public License for more details.
 12 *
 13 * You should have received a copy of the GNU General Public License
 14 * along with this program; if not, write to the Free Software
 15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 16 * 02110-1301 USA
 17 *
 18 * Copyright (C) 2005 Texas Instruments Incorporated
 19 * Copyright (C) 2008 Google Inc
 20 * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
 21 */
 22#include <linux/interrupt.h>
 23#include <linux/module.h>
 24#include <linux/mod_devicetable.h>
 25#include <linux/mmc/sdio_func.h>
 26#include <linux/mmc/sdio_ids.h>
 27#include <linux/platform_device.h>
 28#include <linux/wl12xx.h>
 29#include <linux/irq.h>
 30#include <linux/pm_runtime.h>
 31
 32#include "wl1251.h"
 33
 34#ifndef SDIO_VENDOR_ID_TI
 35#define SDIO_VENDOR_ID_TI		0x104c
 36#endif
 37
 38#ifndef SDIO_DEVICE_ID_TI_WL1251
 39#define SDIO_DEVICE_ID_TI_WL1251	0x9066
 40#endif
 41
 42struct wl1251_sdio {
 43	struct sdio_func *func;
 44	u32 elp_val;
 45};
 46
 47static struct sdio_func *wl_to_func(struct wl1251 *wl)
 48{
 49	struct wl1251_sdio *wl_sdio = wl->if_priv;
 50	return wl_sdio->func;
 51}
 52
 53static void wl1251_sdio_interrupt(struct sdio_func *func)
 54{
 55	struct wl1251 *wl = sdio_get_drvdata(func);
 56
 57	wl1251_debug(DEBUG_IRQ, "IRQ");
 58
 59	/* FIXME should be synchronous for sdio */
 60	ieee80211_queue_work(wl->hw, &wl->irq_work);
 61}
 62
 63static const struct sdio_device_id wl1251_devices[] = {
 64	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
 65	{}
 66};
 67MODULE_DEVICE_TABLE(sdio, wl1251_devices);
 68
 69
 70static void wl1251_sdio_read(struct wl1251 *wl, int addr,
 71			     void *buf, size_t len)
 72{
 73	int ret;
 74	struct sdio_func *func = wl_to_func(wl);
 75
 76	sdio_claim_host(func);
 77	ret = sdio_memcpy_fromio(func, buf, addr, len);
 78	if (ret)
 79		wl1251_error("sdio read failed (%d)", ret);
 80	sdio_release_host(func);
 81}
 82
 83static void wl1251_sdio_write(struct wl1251 *wl, int addr,
 84			      void *buf, size_t len)
 85{
 86	int ret;
 87	struct sdio_func *func = wl_to_func(wl);
 88
 89	sdio_claim_host(func);
 90	ret = sdio_memcpy_toio(func, addr, buf, len);
 91	if (ret)
 92		wl1251_error("sdio write failed (%d)", ret);
 93	sdio_release_host(func);
 94}
 95
 96static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
 97{
 98	int ret = 0;
 99	struct wl1251_sdio *wl_sdio = wl->if_priv;
100	struct sdio_func *func = wl_sdio->func;
101
102	/*
103	 * The hardware only supports RAW (read after write) access for
104	 * reading, regular sdio_readb won't work here (it interprets
105	 * the unused bits of CMD52 as write data even if we send read
106	 * request).
107	 */
108	sdio_claim_host(func);
109	*val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
110	sdio_release_host(func);
111
112	if (ret)
113		wl1251_error("sdio_readb failed (%d)", ret);
114}
115
116static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
117{
118	int ret = 0;
119	struct wl1251_sdio *wl_sdio = wl->if_priv;
120	struct sdio_func *func = wl_sdio->func;
121
122	sdio_claim_host(func);
123	sdio_writeb(func, val, addr, &ret);
124	sdio_release_host(func);
125
126	if (ret)
127		wl1251_error("sdio_writeb failed (%d)", ret);
128	else
129		wl_sdio->elp_val = val;
130}
131
132static void wl1251_sdio_reset(struct wl1251 *wl)
133{
134}
135
136static void wl1251_sdio_enable_irq(struct wl1251 *wl)
137{
138	struct sdio_func *func = wl_to_func(wl);
139
140	sdio_claim_host(func);
141	sdio_claim_irq(func, wl1251_sdio_interrupt);
142	sdio_release_host(func);
143}
144
145static void wl1251_sdio_disable_irq(struct wl1251 *wl)
146{
147	struct sdio_func *func = wl_to_func(wl);
148
149	sdio_claim_host(func);
150	sdio_release_irq(func);
151	sdio_release_host(func);
152}
153
154/* Interrupts when using dedicated WLAN_IRQ pin */
155static irqreturn_t wl1251_line_irq(int irq, void *cookie)
156{
157	struct wl1251 *wl = cookie;
158
159	ieee80211_queue_work(wl->hw, &wl->irq_work);
160
161	return IRQ_HANDLED;
162}
163
164static void wl1251_enable_line_irq(struct wl1251 *wl)
165{
166	return enable_irq(wl->irq);
167}
168
169static void wl1251_disable_line_irq(struct wl1251 *wl)
170{
171	return disable_irq(wl->irq);
172}
173
174static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
175{
176	struct sdio_func *func = wl_to_func(wl);
177	int ret;
178
179	if (enable) {
180		/*
181		 * Power is controlled by runtime PM, but we still call board
182		 * callback in case it wants to do any additional setup,
183		 * for example enabling clock buffer for the module.
184		 */
185		if (wl->set_power)
186			wl->set_power(true);
187
188		ret = pm_runtime_get_sync(&func->dev);
189		if (ret < 0)
190			goto out;
191
192		sdio_claim_host(func);
193		sdio_enable_func(func);
194		sdio_release_host(func);
195	} else {
196		sdio_claim_host(func);
197		sdio_disable_func(func);
198		sdio_release_host(func);
199
200		ret = pm_runtime_put_sync(&func->dev);
201		if (ret < 0)
202			goto out;
203
204		if (wl->set_power)
205			wl->set_power(false);
206	}
207
208out:
209	return ret;
210}
211
212static struct wl1251_if_operations wl1251_sdio_ops = {
213	.read = wl1251_sdio_read,
214	.write = wl1251_sdio_write,
215	.write_elp = wl1251_sdio_write_elp,
216	.read_elp = wl1251_sdio_read_elp,
217	.reset = wl1251_sdio_reset,
218	.power = wl1251_sdio_set_power,
219};
220
221static int wl1251_sdio_probe(struct sdio_func *func,
222			     const struct sdio_device_id *id)
223{
224	int ret;
225	struct wl1251 *wl;
226	struct ieee80211_hw *hw;
227	struct wl1251_sdio *wl_sdio;
228	const struct wl12xx_platform_data *wl12xx_board_data;
229
230	hw = wl1251_alloc_hw();
231	if (IS_ERR(hw))
232		return PTR_ERR(hw);
233
234	wl = hw->priv;
235
236	wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
237	if (wl_sdio == NULL) {
238		ret = -ENOMEM;
239		goto out_free_hw;
240	}
241
242	sdio_claim_host(func);
243	ret = sdio_enable_func(func);
244	if (ret)
245		goto release;
246
247	sdio_set_block_size(func, 512);
248	sdio_release_host(func);
249
250	SET_IEEE80211_DEV(hw, &func->dev);
251	wl_sdio->func = func;
252	wl->if_priv = wl_sdio;
253	wl->if_ops = &wl1251_sdio_ops;
254
255	wl12xx_board_data = wl12xx_get_platform_data();
256	if (!IS_ERR(wl12xx_board_data)) {
257		wl->set_power = wl12xx_board_data->set_power;
258		wl->irq = wl12xx_board_data->irq;
259		wl->use_eeprom = wl12xx_board_data->use_eeprom;
260	}
261
262	if (wl->irq) {
263		ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
264		if (ret < 0) {
265			wl1251_error("request_irq() failed: %d", ret);
266			goto disable;
267		}
268
269		irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
270		disable_irq(wl->irq);
271
272		wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
273		wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
274
275		wl1251_info("using dedicated interrupt line");
276	} else {
277		wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
278		wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
279
280		wl1251_info("using SDIO interrupt");
281	}
282
283	ret = wl1251_init_ieee80211(wl);
284	if (ret)
285		goto out_free_irq;
286
287	sdio_set_drvdata(func, wl);
288
289	/* Tell PM core that we don't need the card to be powered now */
290	pm_runtime_put_noidle(&func->dev);
291
292	return ret;
293
294out_free_irq:
295	if (wl->irq)
296		free_irq(wl->irq, wl);
297disable:
298	sdio_claim_host(func);
299	sdio_disable_func(func);
300release:
301	sdio_release_host(func);
302	kfree(wl_sdio);
303out_free_hw:
304	wl1251_free_hw(wl);
305	return ret;
306}
307
308static void __devexit wl1251_sdio_remove(struct sdio_func *func)
309{
310	struct wl1251 *wl = sdio_get_drvdata(func);
311	struct wl1251_sdio *wl_sdio = wl->if_priv;
312
313	/* Undo decrement done above in wl1251_probe */
314	pm_runtime_get_noresume(&func->dev);
315
316	if (wl->irq)
317		free_irq(wl->irq, wl);
318	kfree(wl_sdio);
319	wl1251_free_hw(wl);
320
321	sdio_claim_host(func);
322	sdio_release_irq(func);
323	sdio_disable_func(func);
324	sdio_release_host(func);
325}
326
327static int wl1251_suspend(struct device *dev)
328{
329	/*
330	 * Tell MMC/SDIO core it's OK to power down the card
331	 * (if it isn't already), but not to remove it completely.
332	 */
333	return 0;
334}
335
336static int wl1251_resume(struct device *dev)
337{
338	return 0;
339}
340
341static const struct dev_pm_ops wl1251_sdio_pm_ops = {
342	.suspend        = wl1251_suspend,
343	.resume         = wl1251_resume,
344};
345
346static struct sdio_driver wl1251_sdio_driver = {
347	.name		= "wl1251_sdio",
348	.id_table	= wl1251_devices,
349	.probe		= wl1251_sdio_probe,
350	.remove		= __devexit_p(wl1251_sdio_remove),
351	.drv.pm		= &wl1251_sdio_pm_ops,
352};
353
354static int __init wl1251_sdio_init(void)
355{
356	int err;
357
358	err = sdio_register_driver(&wl1251_sdio_driver);
359	if (err)
360		wl1251_error("failed to register sdio driver: %d", err);
361	return err;
362}
363
364static void __exit wl1251_sdio_exit(void)
365{
366	sdio_unregister_driver(&wl1251_sdio_driver);
367	wl1251_notice("unloaded");
368}
369
370module_init(wl1251_sdio_init);
371module_exit(wl1251_sdio_exit);
372
373MODULE_LICENSE("GPL");
374MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");