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
  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
  42 struct wl1251_sdio {
  43         struct sdio_func *func;
  44         u32 elp_val;
  45 };
  46
  47 static 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
  53 static 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
  63 static const struct sdio_device_id wl1251_devices[] = {
  64         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
  65         {}
  66 };
  67 MODULE_DEVICE_TABLE(sdio, wl1251_devices);
  68
  69
  70 static 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
  83 static 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
  96 static 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
 116 static 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
 132 static void wl1251_sdio_reset(struct wl1251 *wl)
 133 {
 134 }
 135
 136 static 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
 145 static 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 */
 155 static 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
 164 static void wl1251_enable_line_irq(struct wl1251 *wl)
 165 {
 166         return enable_irq(wl->irq);
 167 }
 168
 169 static void wl1251_disable_line_irq(struct wl1251 *wl)
 170 {
 171         return disable_irq(wl->irq);
 172 }
 173
 174 static 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                         pm_runtime_put_sync(&func->dev);
 191                         goto out;
 192                 }
 193
 194                 sdio_claim_host(func);
 195                 sdio_enable_func(func);
 196                 sdio_release_host(func);
 197         } else {
 198                 sdio_claim_host(func);
 199                 sdio_disable_func(func);
 200                 sdio_release_host(func);
 201
 202                 ret = pm_runtime_put_sync(&func->dev);
 203                 if (ret < 0)
 204                         goto out;
 205
 206                 if (wl->set_power)
 207                         wl->set_power(false);
 208         }
 209
 210 out:
 211         return ret;
 212 }
 213
 214 static struct wl1251_if_operations wl1251_sdio_ops = {
 215         .read = wl1251_sdio_read,
 216         .write = wl1251_sdio_write,
 217         .write_elp = wl1251_sdio_write_elp,
 218         .read_elp = wl1251_sdio_read_elp,
 219         .reset = wl1251_sdio_reset,
 220         .power = wl1251_sdio_set_power,
 221 };
 222
 223 static int wl1251_sdio_probe(struct sdio_func *func,
 224                              const struct sdio_device_id *id)
 225 {
 226         int ret;
 227         struct wl1251 *wl;
 228         struct ieee80211_hw *hw;
 229         struct wl1251_sdio *wl_sdio;
 230         const struct wl12xx_platform_data *wl12xx_board_data;
 231
 232         hw = wl1251_alloc_hw();
 233         if (IS_ERR(hw))
 234                 return PTR_ERR(hw);
 235
 236         wl = hw->priv;
 237
 238         wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
 239         if (wl_sdio == NULL) {
 240                 ret = -ENOMEM;
 241                 goto out_free_hw;
 242         }
 243
 244         sdio_claim_host(func);
 245         ret = sdio_enable_func(func);
 246         if (ret)
 247                 goto release;
 248
 249         sdio_set_block_size(func, 512);
 250         sdio_release_host(func);
 251
 252         SET_IEEE80211_DEV(hw, &func->dev);
 253         wl_sdio->func = func;
 254         wl->if_priv = wl_sdio;
 255         wl->if_ops = &wl1251_sdio_ops;
 256
 257         wl12xx_board_data = wl12xx_get_platform_data();
 258         if (!IS_ERR(wl12xx_board_data)) {
 259                 wl->set_power = wl12xx_board_data->set_power;
 260                 wl->irq = wl12xx_board_data->irq;
 261                 wl->use_eeprom = wl12xx_board_data->use_eeprom;
 262         }
 263
 264         if (wl->irq) {
 265                 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
 266                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
 267                 if (ret < 0) {
 268                         wl1251_error("request_irq() failed: %d", ret);
 269                         goto disable;
 270                 }
 271
 272                 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 273
 274                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
 275                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
 276
 277                 wl1251_info("using dedicated interrupt line");
 278         } else {
 279                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
 280                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
 281
 282                 wl1251_info("using SDIO interrupt");
 283         }
 284
 285         ret = wl1251_init_ieee80211(wl);
 286         if (ret)
 287                 goto out_free_irq;
 288
 289         sdio_set_drvdata(func, wl);
 290
 291         /* Tell PM core that we don't need the card to be powered now */
 292         pm_runtime_put_noidle(&func->dev);
 293
 294         return ret;
 295
 296 out_free_irq:
 297         if (wl->irq)
 298                 free_irq(wl->irq, wl);
 299 disable:
 300         sdio_claim_host(func);
 301         sdio_disable_func(func);
 302 release:
 303         sdio_release_host(func);
 304         kfree(wl_sdio);
 305 out_free_hw:
 306         wl1251_free_hw(wl);
 307         return ret;
 308 }
 309
 310 static void wl1251_sdio_remove(struct sdio_func *func)
 311 {
 312         struct wl1251 *wl = sdio_get_drvdata(func);
 313         struct wl1251_sdio *wl_sdio = wl->if_priv;
 314
 315         /* Undo decrement done above in wl1251_probe */
 316         pm_runtime_get_noresume(&func->dev);
 317
 318         if (wl->irq)
 319                 free_irq(wl->irq, wl);
 320         wl1251_free_hw(wl);
 321         kfree(wl_sdio);
 322
 323         sdio_claim_host(func);
 324         sdio_release_irq(func);
 325         sdio_disable_func(func);
 326         sdio_release_host(func);
 327 }
 328
 329 static int wl1251_suspend(struct device *dev)
 330 {
 331         /*
 332          * Tell MMC/SDIO core it's OK to power down the card
 333          * (if it isn't already), but not to remove it completely.
 334          */
 335         return 0;
 336 }
 337
 338 static int wl1251_resume(struct device *dev)
 339 {
 340         return 0;
 341 }
 342
 343 static const struct dev_pm_ops wl1251_sdio_pm_ops = {
 344         .suspend        = wl1251_suspend,
 345         .resume         = wl1251_resume,
 346 };
 347
 348 static struct sdio_driver wl1251_sdio_driver = {
 349         .name           = "wl1251_sdio",
 350         .id_table       = wl1251_devices,
 351         .probe          = wl1251_sdio_probe,
 352         .remove         = wl1251_sdio_remove,
 353         .drv.pm         = &wl1251_sdio_pm_ops,
 354 };
 355
 356 static int __init wl1251_sdio_init(void)
 357 {
 358         int err;
 359
 360         err = sdio_register_driver(&wl1251_sdio_driver);
 361         if (err)
 362                 wl1251_error("failed to register sdio driver: %d", err);
 363         return err;
 364 }
 365
 366 static void __exit wl1251_sdio_exit(void)
 367 {
 368         sdio_unregister_driver(&wl1251_sdio_driver);
 369         wl1251_notice("unloaded");
 370 }
 371
 372 module_init(wl1251_sdio_init);
 373 module_exit(wl1251_sdio_exit);
 374
 375 MODULE_LICENSE("GPL");
 376 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");