wl1271: sdio: claim host only when doing IO
[pandora-kernel.git] / drivers / net / wireless / wl12xx / wl1271_sdio.c
1 /*
2  * This file is part of wl1271
3  *
4  * Copyright (C) 2009-2010 Nokia Corporation
5  *
6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  *
22  */
23
24 #include <linux/irq.h>
25 #include <linux/module.h>
26 #include <linux/crc7.h>
27 #include <linux/vmalloc.h>
28 #include <linux/mmc/sdio_func.h>
29 #include <linux/mmc/sdio_ids.h>
30 #include <linux/mmc/card.h>
31 #include <linux/gpio.h>
32
33 #include "wl1271.h"
34 #include "wl12xx_80211.h"
35 #include "wl1271_io.h"
36
37
38 #define RX71_WL1271_IRQ_GPIO            42
39
40 #ifndef SDIO_VENDOR_ID_TI
41 #define SDIO_VENDOR_ID_TI               0x0097
42 #endif
43
44 #ifndef SDIO_DEVICE_ID_TI_WL1271
45 #define SDIO_DEVICE_ID_TI_WL1271        0x4076
46 #endif
47
48 static const struct sdio_device_id wl1271_devices[] = {
49         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271) },
50         {}
51 };
52 MODULE_DEVICE_TABLE(sdio, wl1271_devices);
53
54 static inline struct sdio_func *wl_to_func(struct wl1271 *wl)
55 {
56         return wl->if_priv;
57 }
58
59 static struct device *wl1271_sdio_wl_to_dev(struct wl1271 *wl)
60 {
61         return &(wl_to_func(wl)->dev);
62 }
63
64 static irqreturn_t wl1271_irq(int irq, void *cookie)
65 {
66         struct wl1271 *wl = cookie;
67         unsigned long flags;
68
69         wl1271_debug(DEBUG_IRQ, "IRQ");
70
71         /* complete the ELP completion */
72         spin_lock_irqsave(&wl->wl_lock, flags);
73         if (wl->elp_compl) {
74                 complete(wl->elp_compl);
75                 wl->elp_compl = NULL;
76         }
77
78         if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
79                 ieee80211_queue_work(wl->hw, &wl->irq_work);
80         set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags);
81         spin_unlock_irqrestore(&wl->wl_lock, flags);
82
83         return IRQ_HANDLED;
84 }
85
86 static void wl1271_sdio_disable_interrupts(struct wl1271 *wl)
87 {
88         disable_irq(wl->irq);
89 }
90
91 static void wl1271_sdio_enable_interrupts(struct wl1271 *wl)
92 {
93         enable_irq(wl->irq);
94 }
95
96 static void wl1271_sdio_reset(struct wl1271 *wl)
97 {
98 }
99
100 static void wl1271_sdio_init(struct wl1271 *wl)
101 {
102 }
103
104 static void wl1271_sdio_raw_read(struct wl1271 *wl, int addr, void *buf,
105                                  size_t len, bool fixed)
106 {
107         int ret;
108         struct sdio_func *func = wl_to_func(wl);
109
110         sdio_claim_host(func);
111
112         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) {
113                 ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
114                 wl1271_debug(DEBUG_SDIO, "sdio read 52 addr 0x%x, byte 0x%02x",
115                              addr, ((u8 *)buf)[0]);
116         } else {
117                 if (fixed)
118                         ret = sdio_readsb(func, buf, addr, len);
119                 else
120                         ret = sdio_memcpy_fromio(func, buf, addr, len);
121
122                 wl1271_debug(DEBUG_SDIO, "sdio read 53 addr 0x%x, %zu bytes",
123                              addr, len);
124                 wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len);
125         }
126
127         sdio_release_host(func);
128
129         if (ret)
130                 wl1271_error("sdio read failed (%d)", ret);
131 }
132
133 static void wl1271_sdio_raw_write(struct wl1271 *wl, int addr, void *buf,
134                                   size_t len, bool fixed)
135 {
136         int ret;
137         struct sdio_func *func = wl_to_func(wl);
138
139         sdio_claim_host(func);
140
141         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) {
142                 sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
143                 wl1271_debug(DEBUG_SDIO, "sdio write 52 addr 0x%x, byte 0x%02x",
144                              addr, ((u8 *)buf)[0]);
145         } else {
146                 wl1271_debug(DEBUG_SDIO, "sdio write 53 addr 0x%x, %zu bytes",
147                              addr, len);
148                 wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len);
149
150                 if (fixed)
151                         ret = sdio_writesb(func, addr, buf, len);
152                 else
153                         ret = sdio_memcpy_toio(func, addr, buf, len);
154         }
155
156         sdio_release_host(func);
157
158         if (ret)
159                 wl1271_error("sdio write failed (%d)", ret);
160 }
161
162 static int wl1271_sdio_power_on(struct wl1271 *wl)
163 {
164         struct sdio_func *func = wl_to_func(wl);
165
166         sdio_claim_host(func);
167         sdio_enable_func(func);
168         sdio_release_host(func);
169
170         return 0;
171 }
172
173 static int wl1271_sdio_power_off(struct wl1271 *wl)
174 {
175         struct sdio_func *func = wl_to_func(wl);
176
177         sdio_claim_host(func);
178         sdio_disable_func(func);
179         sdio_release_host(func);
180
181         return 0;
182 }
183
184 static void wl1271_sdio_set_power(struct wl1271 *wl, bool enable)
185 {
186         struct sdio_func *func = wl_to_func(wl);
187
188         /* Let the SDIO stack handle wlan_enable control, so we
189          * keep host claimed while wlan is in use to keep wl1271
190          * alive.
191          */
192         if (enable)
193                 return wl1271_sdio_power_on(wl);
194         else
195                 return wl1271_sdio_power_off(wl);
196
197 }
198
199 static struct wl1271_if_operations sdio_ops = {
200         .read           = wl1271_sdio_raw_read,
201         .write          = wl1271_sdio_raw_write,
202         .reset          = wl1271_sdio_reset,
203         .init           = wl1271_sdio_init,
204         .power          = wl1271_sdio_set_power,
205         .dev            = wl1271_sdio_wl_to_dev,
206         .enable_irq     = wl1271_sdio_enable_interrupts,
207         .disable_irq    = wl1271_sdio_disable_interrupts
208 };
209
210 static int __devinit wl1271_probe(struct sdio_func *func,
211                                   const struct sdio_device_id *id)
212 {
213         struct ieee80211_hw *hw;
214         struct wl1271 *wl;
215         int ret;
216
217         /* We are only able to handle the wlan function */
218         if (func->num != 0x02)
219                 return -ENODEV;
220
221         hw = wl1271_alloc_hw();
222         if (IS_ERR(hw))
223                 return PTR_ERR(hw);
224
225         wl = hw->priv;
226
227         wl->if_priv = func;
228         wl->if_ops = &sdio_ops;
229
230         /* Grab access to FN0 for ELP reg. */
231         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
232
233         wl->irq = gpio_to_irq(RX71_WL1271_IRQ_GPIO);
234         if (wl->irq < 0) {
235                 ret = wl->irq;
236                 wl1271_error("could not get irq!");
237                 goto out_free;
238         }
239
240         ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
241         if (ret < 0) {
242                 wl1271_error("request_irq() failed: %d", ret);
243                 goto out_free;
244         }
245
246         set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
247
248         disable_irq(wl->irq);
249
250         ret = wl1271_init_ieee80211(wl);
251         if (ret)
252                 goto out_irq;
253
254         ret = wl1271_register_hw(wl);
255         if (ret)
256                 goto out_irq;
257
258         sdio_set_drvdata(func, wl);
259
260         wl1271_notice("initialized");
261
262         return 0;
263
264  out_irq:
265         free_irq(wl->irq, wl);
266
267
268  out_free:
269         wl1271_free_hw(wl);
270
271         return ret;
272 }
273
274 static void __devexit wl1271_remove(struct sdio_func *func)
275 {
276         struct wl1271 *wl = sdio_get_drvdata(func);
277
278         free_irq(wl->irq, wl);
279
280         wl1271_unregister_hw(wl);
281         wl1271_free_hw(wl);
282 }
283
284 static struct sdio_driver wl1271_sdio_driver = {
285         .name           = "wl1271_sdio",
286         .id_table       = wl1271_devices,
287         .probe          = wl1271_probe,
288         .remove         = __devexit_p(wl1271_remove),
289 };
290
291 static int __init wl1271_init(void)
292 {
293         int ret;
294
295         ret = sdio_register_driver(&wl1271_sdio_driver);
296         if (ret < 0) {
297                 wl1271_error("failed to register sdio driver: %d", ret);
298                 goto out;
299         }
300
301 out:
302         return ret;
303 }
304
305 static void __exit wl1271_exit(void)
306 {
307         sdio_unregister_driver(&wl1271_sdio_driver);
308
309         wl1271_notice("unloaded");
310 }
311
312 module_init(wl1271_init);
313 module_exit(wl1271_exit);
314
315 MODULE_LICENSE("GPL");
316 MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
317 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
318 MODULE_FIRMWARE(WL1271_FW_NAME);