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