drivers/net/wireless/ti/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/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 #include <linux/gpio.h>
  32
  33 #include "wl1251.h"
  34
  35 #ifndef SDIO_VENDOR_ID_TI
  36 #define SDIO_VENDOR_ID_TI               0x104c
  37 #endif
  38
  39 #ifndef SDIO_DEVICE_ID_TI_WL1251
  40 #define SDIO_DEVICE_ID_TI_WL1251        0x9066
  41 #endif
  42
  43 struct wl1251_sdio {
  44         struct sdio_func *func;
  45         u32 elp_val;
  46 };
  47
  48 static struct sdio_func *wl_to_func(struct wl1251 *wl)
  49 {
  50         struct wl1251_sdio *wl_sdio = wl->if_priv;
  51         return wl_sdio->func;
  52 }
  53
  54 static void wl1251_sdio_interrupt(struct sdio_func *func)
  55 {
  56         struct wl1251 *wl = sdio_get_drvdata(func);
  57
  58         wl1251_debug(DEBUG_IRQ, "IRQ");
  59
  60         /* FIXME should be synchronous for sdio */
  61         ieee80211_queue_work(wl->hw, &wl->irq_work);
  62 }
  63
  64 static const struct sdio_device_id wl1251_devices[] = {
  65         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
  66         {}
  67 };
  68 MODULE_DEVICE_TABLE(sdio, wl1251_devices);
  69
  70
  71 static void wl1251_sdio_read(struct wl1251 *wl, int addr,
  72                              void *buf, size_t len)
  73 {
  74         int ret;
  75         struct sdio_func *func = wl_to_func(wl);
  76
  77         sdio_claim_host(func);
  78         ret = sdio_memcpy_fromio(func, buf, addr, len);
  79         if (ret)
  80                 wl1251_error("sdio read failed (%d)", ret);
  81         sdio_release_host(func);
  82 }
  83
  84 static void wl1251_sdio_write(struct wl1251 *wl, int addr,
  85                               void *buf, size_t len)
  86 {
  87         int ret;
  88         struct sdio_func *func = wl_to_func(wl);
  89
  90         sdio_claim_host(func);
  91         ret = sdio_memcpy_toio(func, addr, buf, len);
  92         if (ret)
  93                 wl1251_error("sdio write failed (%d)", ret);
  94         sdio_release_host(func);
  95 }
  96
  97 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
  98 {
  99         int ret = 0;
 100         struct wl1251_sdio *wl_sdio = wl->if_priv;
 101         struct sdio_func *func = wl_sdio->func;
 102
 103         /*
 104          * The hardware only supports RAW (read after write) access for
 105          * reading, regular sdio_readb won't work here (it interprets
 106          * the unused bits of CMD52 as write data even if we send read
 107          * request).
 108          */
 109         sdio_claim_host(func);
 110         *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
 111         sdio_release_host(func);
 112
 113         if (ret)
 114                 wl1251_error("sdio_readb failed (%d)", ret);
 115 }
 116
 117 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
 118 {
 119         int ret = 0;
 120         struct wl1251_sdio *wl_sdio = wl->if_priv;
 121         struct sdio_func *func = wl_sdio->func;
 122
 123         sdio_claim_host(func);
 124         sdio_writeb(func, val, addr, &ret);
 125         sdio_release_host(func);
 126
 127         if (ret)
 128                 wl1251_error("sdio_writeb failed (%d)", ret);
 129         else
 130                 wl_sdio->elp_val = val;
 131 }
 132
 133 static void wl1251_sdio_reset(struct wl1251 *wl)
 134 {
 135 }
 136
 137 static void wl1251_sdio_enable_irq(struct wl1251 *wl)
 138 {
 139         struct sdio_func *func = wl_to_func(wl);
 140
 141         sdio_claim_host(func);
 142         sdio_claim_irq(func, wl1251_sdio_interrupt);
 143         sdio_release_host(func);
 144 }
 145
 146 static void wl1251_sdio_disable_irq(struct wl1251 *wl)
 147 {
 148         struct sdio_func *func = wl_to_func(wl);
 149
 150         sdio_claim_host(func);
 151         sdio_release_irq(func);
 152         sdio_release_host(func);
 153 }
 154
 155 /* Interrupts when using dedicated WLAN_IRQ pin */
 156 static irqreturn_t wl1251_line_irq(int irq, void *cookie)
 157 {
 158         struct wl1251 *wl = cookie;
 159
 160         ieee80211_queue_work(wl->hw, &wl->irq_work);
 161
 162         return IRQ_HANDLED;
 163 }
 164
 165 static void wl1251_enable_line_irq(struct wl1251 *wl)
 166 {
 167         return enable_irq(wl->irq);
 168 }
 169
 170 static void wl1251_disable_line_irq(struct wl1251 *wl)
 171 {
 172         return disable_irq(wl->irq);
 173 }
 174
 175 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
 176 {
 177         struct sdio_func *func = wl_to_func(wl);
 178         int ret;
 179
 180         if (enable) {
 181                 /*
 182                  * Power is controlled by runtime PM, but we still call board
 183                  * callback in case it wants to do any additional setup,
 184                  * for example enabling clock buffer for the module.
 185                  */
 186                 if (gpio_is_valid(wl->power_gpio))
 187                         gpio_set_value(wl->power_gpio, true);
 188
 189
 190                 ret = pm_runtime_get_sync(&func->dev);
 191                 if (ret < 0) {
 192                         pm_runtime_put_sync(&func->dev);
 193                         goto out;
 194                 }
 195
 196                 sdio_claim_host(func);
 197                 sdio_enable_func(func);
 198                 sdio_release_host(func);
 199         } else {
 200                 sdio_claim_host(func);
 201                 sdio_disable_func(func);
 202                 sdio_release_host(func);
 203
 204                 ret = pm_runtime_put_sync(&func->dev);
 205                 if (ret < 0)
 206                         goto out;
 207
 208                 if (gpio_is_valid(wl->power_gpio))
 209                         gpio_set_value(wl->power_gpio, false);
 210         }
 211
 212 out:
 213         return ret;
 214 }
 215
 216 static struct wl1251_if_operations wl1251_sdio_ops = {
 217         .read = wl1251_sdio_read,
 218         .write = wl1251_sdio_write,
 219         .write_elp = wl1251_sdio_write_elp,
 220         .read_elp = wl1251_sdio_read_elp,
 221         .reset = wl1251_sdio_reset,
 222         .power = wl1251_sdio_set_power,
 223 };
 224
 225 static int wl1251_sdio_probe(struct sdio_func *func,
 226                              const struct sdio_device_id *id)
 227 {
 228         int ret;
 229         struct wl1251 *wl;
 230         struct ieee80211_hw *hw;
 231         struct wl1251_sdio *wl_sdio;
 232         const struct wl1251_platform_data *wl1251_board_data;
 233
 234         hw = wl1251_alloc_hw();
 235         if (IS_ERR(hw))
 236                 return PTR_ERR(hw);
 237
 238         wl = hw->priv;
 239
 240         wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
 241         if (wl_sdio == NULL) {
 242                 ret = -ENOMEM;
 243                 goto out_free_hw;
 244         }
 245
 246         sdio_claim_host(func);
 247         ret = sdio_enable_func(func);
 248         if (ret)
 249                 goto release;
 250
 251         sdio_set_block_size(func, 512);
 252         sdio_release_host(func);
 253
 254         SET_IEEE80211_DEV(hw, &func->dev);
 255         wl_sdio->func = func;
 256         wl->if_priv = wl_sdio;
 257         wl->if_ops = &wl1251_sdio_ops;
 258
 259         wl1251_board_data = wl1251_get_platform_data();
 260         if (!IS_ERR(wl1251_board_data)) {
 261                 wl->power_gpio = wl1251_board_data->power_gpio;
 262                 wl->irq = wl1251_board_data->irq;
 263                 wl->use_eeprom = wl1251_board_data->use_eeprom;
 264         }
 265
 266         if (gpio_is_valid(wl->power_gpio)) {
 267                 ret = devm_gpio_request(&func->dev, wl->power_gpio,
 268                                                                 "wl1251 power");
 269                 if (ret) {
 270                         wl1251_error("Failed to request gpio: %d\n", ret);
 271                         goto disable;
 272                 }
 273         }
 274
 275         if (wl->irq) {
 276                 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
 277                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
 278                 if (ret < 0) {
 279                         wl1251_error("request_irq() failed: %d", ret);
 280                         goto disable;
 281                 }
 282
 283                 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 284
 285                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
 286                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
 287
 288                 wl1251_info("using dedicated interrupt line");
 289         } else {
 290                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
 291                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
 292
 293                 wl1251_info("using SDIO interrupt");
 294         }
 295
 296         ret = wl1251_init_ieee80211(wl);
 297         if (ret)
 298                 goto out_free_irq;
 299
 300         sdio_set_drvdata(func, wl);
 301
 302         /* Tell PM core that we don't need the card to be powered now */
 303         pm_runtime_put_noidle(&func->dev);
 304
 305         return ret;
 306
 307 out_free_irq:
 308         if (wl->irq)
 309                 free_irq(wl->irq, wl);
 310 disable:
 311         sdio_claim_host(func);
 312         sdio_disable_func(func);
 313 release:
 314         sdio_release_host(func);
 315         kfree(wl_sdio);
 316 out_free_hw:
 317         wl1251_free_hw(wl);
 318         return ret;
 319 }
 320
 321 static void wl1251_sdio_remove(struct sdio_func *func)
 322 {
 323         struct wl1251 *wl = sdio_get_drvdata(func);
 324         struct wl1251_sdio *wl_sdio = wl->if_priv;
 325
 326         /* Undo decrement done above in wl1251_probe */
 327         pm_runtime_get_noresume(&func->dev);
 328
 329         if (wl->irq)
 330                 free_irq(wl->irq, wl);
 331         wl1251_free_hw(wl);
 332         kfree(wl_sdio);
 333
 334         sdio_claim_host(func);
 335         sdio_release_irq(func);
 336         sdio_disable_func(func);
 337         sdio_release_host(func);
 338 }
 339
 340 static int wl1251_suspend(struct device *dev)
 341 {
 342         /*
 343          * Tell MMC/SDIO core it's OK to power down the card
 344          * (if it isn't already), but not to remove it completely.
 345          */
 346         return 0;
 347 }
 348
 349 static int wl1251_resume(struct device *dev)
 350 {
 351         return 0;
 352 }
 353
 354 static const struct dev_pm_ops wl1251_sdio_pm_ops = {
 355         .suspend        = wl1251_suspend,
 356         .resume         = wl1251_resume,
 357 };
 358
 359 static struct sdio_driver wl1251_sdio_driver = {
 360         .name           = "wl1251_sdio",
 361         .id_table       = wl1251_devices,
 362         .probe          = wl1251_sdio_probe,
 363         .remove         = wl1251_sdio_remove,
 364         .drv.pm         = &wl1251_sdio_pm_ops,
 365 };
 366
 367 static int __init wl1251_sdio_init(void)
 368 {
 369         int err;
 370
 371         err = sdio_register_driver(&wl1251_sdio_driver);
 372         if (err)
 373                 wl1251_error("failed to register sdio driver: %d", err);
 374         return err;
 375 }
 376
 377 static void __exit wl1251_sdio_exit(void)
 378 {
 379         sdio_unregister_driver(&wl1251_sdio_driver);
 380         wl1251_notice("unloaded");
 381 }
 382
 383 module_init(wl1251_sdio_init);
 384 module_exit(wl1251_sdio_exit);
 385
 386 MODULE_LICENSE("GPL");
 387 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");