drivers/net/wireless/wl12xx/wl1251_sdio.c

   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/module.h>
  23 #include <linux/mod_devicetable.h>
  24 #include <linux/mmc/sdio_func.h>
  25 #include <linux/mmc/sdio_ids.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/spi/wl12xx.h>
  28 #include <linux/irq.h>
  29
  30 #include "wl1251.h"
  31
  32 #ifndef SDIO_VENDOR_ID_TI
  33 #define SDIO_VENDOR_ID_TI               0x104c
  34 #endif
  35
  36 #ifndef SDIO_DEVICE_ID_TI_WL1251
  37 #define SDIO_DEVICE_ID_TI_WL1251        0x9066
  38 #endif
  39
  40 static struct wl12xx_platform_data *wl12xx_board_data;
  41
  42 static struct sdio_func *wl_to_func(struct wl1251 *wl)
  43 {
  44         return wl->if_priv;
  45 }
  46
  47 static void wl1251_sdio_interrupt(struct sdio_func *func)
  48 {
  49         struct wl1251 *wl = sdio_get_drvdata(func);
  50
  51         wl1251_debug(DEBUG_IRQ, "IRQ");
  52
  53         /* FIXME should be synchronous for sdio */
  54         ieee80211_queue_work(wl->hw, &wl->irq_work);
  55 }
  56
  57 static const struct sdio_device_id wl1251_devices[] = {
  58         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
  59         {}
  60 };
  61 MODULE_DEVICE_TABLE(sdio, wl1251_devices);
  62
  63
  64 static void wl1251_sdio_read(struct wl1251 *wl, int addr,
  65                              void *buf, size_t len)
  66 {
  67         int ret;
  68         struct sdio_func *func = wl_to_func(wl);
  69
  70         sdio_claim_host(func);
  71         ret = sdio_memcpy_fromio(func, buf, addr, len);
  72         if (ret)
  73                 wl1251_error("sdio read failed (%d)", ret);
  74         sdio_release_host(func);
  75 }
  76
  77 static void wl1251_sdio_write(struct wl1251 *wl, int addr,
  78                               void *buf, size_t len)
  79 {
  80         int ret;
  81         struct sdio_func *func = wl_to_func(wl);
  82
  83         sdio_claim_host(func);
  84         ret = sdio_memcpy_toio(func, addr, buf, len);
  85         if (ret)
  86                 wl1251_error("sdio write failed (%d)", ret);
  87         sdio_release_host(func);
  88 }
  89
  90 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
  91 {
  92         int ret = 0;
  93         struct sdio_func *func = wl_to_func(wl);
  94
  95         sdio_claim_host(func);
  96         *val = sdio_readb(func, addr, &ret);
  97         sdio_release_host(func);
  98
  99         if (ret)
 100                 wl1251_error("sdio_readb failed (%d)", ret);
 101 }
 102
 103 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
 104 {
 105         int ret = 0;
 106         struct sdio_func *func = wl_to_func(wl);
 107
 108         sdio_claim_host(func);
 109         sdio_writeb(func, val, addr, &ret);
 110         sdio_release_host(func);
 111
 112         if (ret)
 113                 wl1251_error("sdio_writeb failed (%d)", ret);
 114 }
 115
 116 static void wl1251_sdio_reset(struct wl1251 *wl)
 117 {
 118 }
 119
 120 static void wl1251_sdio_enable_irq(struct wl1251 *wl)
 121 {
 122         struct sdio_func *func = wl_to_func(wl);
 123
 124         sdio_claim_host(func);
 125         sdio_claim_irq(func, wl1251_sdio_interrupt);
 126         sdio_release_host(func);
 127 }
 128
 129 static void wl1251_sdio_disable_irq(struct wl1251 *wl)
 130 {
 131         struct sdio_func *func = wl_to_func(wl);
 132
 133         sdio_claim_host(func);
 134         sdio_release_irq(func);
 135         sdio_release_host(func);
 136 }
 137
 138 /* Interrupts when using dedicated WLAN_IRQ pin */
 139 static irqreturn_t wl1251_line_irq(int irq, void *cookie)
 140 {
 141         struct wl1251 *wl = cookie;
 142
 143         ieee80211_queue_work(wl->hw, &wl->irq_work);
 144
 145         return IRQ_HANDLED;
 146 }
 147
 148 static void wl1251_enable_line_irq(struct wl1251 *wl)
 149 {
 150         return enable_irq(wl->irq);
 151 }
 152
 153 static void wl1251_disable_line_irq(struct wl1251 *wl)
 154 {
 155         return disable_irq(wl->irq);
 156 }
 157
 158 static void wl1251_sdio_set_power(bool enable)
 159 {
 160 }
 161
 162 static struct wl1251_if_operations wl1251_sdio_ops = {
 163         .read = wl1251_sdio_read,
 164         .write = wl1251_sdio_write,
 165         .write_elp = wl1251_sdio_write_elp,
 166         .read_elp = wl1251_sdio_read_elp,
 167         .reset = wl1251_sdio_reset,
 168 };
 169
 170 static int wl1251_platform_probe(struct platform_device *pdev)
 171 {
 172         if (pdev->id != -1) {
 173                 wl1251_error("can only handle single device");
 174                 return -ENODEV;
 175         }
 176
 177         wl12xx_board_data = pdev->dev.platform_data;
 178         return 0;
 179 }
 180
 181 /*
 182  * Dummy platform_driver for passing platform_data to this driver,
 183  * until we have a way to pass this through SDIO subsystem or
 184  * some other way.
 185  */
 186 static struct platform_driver wl1251_platform_driver = {
 187         .driver = {
 188                 .name   = "wl1251_data",
 189                 .owner  = THIS_MODULE,
 190         },
 191         .probe  = wl1251_platform_probe,
 192 };
 193
 194 static int wl1251_sdio_probe(struct sdio_func *func,
 195                              const struct sdio_device_id *id)
 196 {
 197         int ret;
 198         struct wl1251 *wl;
 199         struct ieee80211_hw *hw;
 200
 201         hw = wl1251_alloc_hw();
 202         if (IS_ERR(hw))
 203                 return PTR_ERR(hw);
 204
 205         wl = hw->priv;
 206
 207         sdio_claim_host(func);
 208         ret = sdio_enable_func(func);
 209         if (ret)
 210                 goto release;
 211
 212         sdio_set_block_size(func, 512);
 213         sdio_release_host(func);
 214
 215         SET_IEEE80211_DEV(hw, &func->dev);
 216         wl->if_priv = func;
 217         wl->if_ops = &wl1251_sdio_ops;
 218         wl->set_power = wl1251_sdio_set_power;
 219
 220         if (wl12xx_board_data != NULL) {
 221                 wl->set_power = wl12xx_board_data->set_power;
 222                 wl->irq = wl12xx_board_data->irq;
 223                 wl->use_eeprom = wl12xx_board_data->use_eeprom;
 224         }
 225
 226         if (wl->irq) {
 227                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
 228                 if (ret < 0) {
 229                         wl1251_error("request_irq() failed: %d", ret);
 230                         goto disable;
 231                 }
 232
 233                 set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 234                 disable_irq(wl->irq);
 235
 236                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
 237                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
 238
 239                 wl1251_info("using dedicated interrupt line");
 240         } else {
 241                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
 242                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
 243
 244                 wl1251_info("using SDIO interrupt");
 245         }
 246
 247         ret = wl1251_init_ieee80211(wl);
 248         if (ret)
 249                 goto out_free_irq;
 250
 251         sdio_set_drvdata(func, wl);
 252         return ret;
 253
 254 out_free_irq:
 255         if (wl->irq)
 256                 free_irq(wl->irq, wl);
 257 disable:
 258         sdio_claim_host(func);
 259         sdio_disable_func(func);
 260 release:
 261         sdio_release_host(func);
 262         return ret;
 263 }
 264
 265 static void __devexit wl1251_sdio_remove(struct sdio_func *func)
 266 {
 267         struct wl1251 *wl = sdio_get_drvdata(func);
 268
 269         if (wl->irq)
 270                 free_irq(wl->irq, wl);
 271         wl1251_free_hw(wl);
 272
 273         sdio_claim_host(func);
 274         sdio_release_irq(func);
 275         sdio_disable_func(func);
 276         sdio_release_host(func);
 277 }
 278
 279 static struct sdio_driver wl1251_sdio_driver = {
 280         .name           = "wl1251_sdio",
 281         .id_table       = wl1251_devices,
 282         .probe          = wl1251_sdio_probe,
 283         .remove         = __devexit_p(wl1251_sdio_remove),
 284 };
 285
 286 static int __init wl1251_sdio_init(void)
 287 {
 288         int err;
 289
 290         err = platform_driver_register(&wl1251_platform_driver);
 291         if (err) {
 292                 wl1251_error("failed to register platform driver: %d", err);
 293                 return err;
 294         }
 295
 296         err = sdio_register_driver(&wl1251_sdio_driver);
 297         if (err)
 298                 wl1251_error("failed to register sdio driver: %d", err);
 299         return err;
 300 }
 301
 302 static void __exit wl1251_sdio_exit(void)
 303 {
 304         sdio_unregister_driver(&wl1251_sdio_driver);
 305         platform_driver_unregister(&wl1251_platform_driver);
 306         wl1251_notice("unloaded");
 307 }
 308
 309 module_init(wl1251_sdio_init);
 310 module_exit(wl1251_sdio_exit);
 311
 312 MODULE_LICENSE("GPL");
 313 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");