drivers/net/wireless/wl12xx/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/mmc/host.h>
  32 #include <linux/gpio.h>
  33 #include <linux/wl12xx.h>
  34 #include <linux/pm_runtime.h>
  35
  36 #include "wl12xx.h"
  37 #include "wl12xx_80211.h"
  38 #include "io.h"
  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 void wl1271_sdio_set_block_size(struct wl1271 *wl, unsigned int blksz)
  55 {
  56         sdio_claim_host(wl->if_priv);
  57         sdio_set_block_size(wl->if_priv, blksz);
  58         sdio_release_host(wl->if_priv);
  59 }
  60
  61 static inline struct sdio_func *wl_to_func(struct wl1271 *wl)
  62 {
  63         return wl->if_priv;
  64 }
  65
  66 static struct device *wl1271_sdio_wl_to_dev(struct wl1271 *wl)
  67 {
  68         return &(wl_to_func(wl)->dev);
  69 }
  70
  71 static irqreturn_t wl1271_hardirq(int irq, void *cookie)
  72 {
  73         struct wl1271 *wl = cookie;
  74         unsigned long flags;
  75
  76         wl1271_debug(DEBUG_IRQ, "IRQ");
  77
  78         /* complete the ELP completion */
  79         spin_lock_irqsave(&wl->wl_lock, flags);
  80         set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags);
  81         if (wl->elp_compl) {
  82                 complete(wl->elp_compl);
  83                 wl->elp_compl = NULL;
  84         }
  85
  86         if (test_bit(WL1271_FLAG_SUSPENDED, &wl->flags)) {
  87                 /* don't enqueue a work right now. mark it as pending */
  88                 set_bit(WL1271_FLAG_PENDING_WORK, &wl->flags);
  89                 wl1271_debug(DEBUG_IRQ, "should not enqueue work");
  90                 disable_irq_nosync(wl->irq);
  91                 pm_wakeup_event(wl1271_sdio_wl_to_dev(wl), 0);
  92                 spin_unlock_irqrestore(&wl->wl_lock, flags);
  93                 return IRQ_HANDLED;
  94         }
  95         spin_unlock_irqrestore(&wl->wl_lock, flags);
  96
  97         return IRQ_WAKE_THREAD;
  98 }
  99
 100 static void wl1271_sdio_disable_interrupts(struct wl1271 *wl)
 101 {
 102         disable_irq(wl->irq);
 103 }
 104
 105 static void wl1271_sdio_enable_interrupts(struct wl1271 *wl)
 106 {
 107         enable_irq(wl->irq);
 108 }
 109
 110 static void wl1271_sdio_reset(struct wl1271 *wl)
 111 {
 112 }
 113
 114 static void wl1271_sdio_init(struct wl1271 *wl)
 115 {
 116 }
 117
 118 static void wl1271_sdio_raw_read(struct wl1271 *wl, int addr, void *buf,
 119                                  size_t len, bool fixed)
 120 {
 121         int ret;
 122         struct sdio_func *func = wl_to_func(wl);
 123
 124         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) {
 125                 ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
 126                 wl1271_debug(DEBUG_SDIO, "sdio read 52 addr 0x%x, byte 0x%02x",
 127                              addr, ((u8 *)buf)[0]);
 128         } else {
 129                 if (fixed)
 130                         ret = sdio_readsb(func, buf, addr, len);
 131                 else
 132                         ret = sdio_memcpy_fromio(func, buf, addr, len);
 133
 134                 wl1271_debug(DEBUG_SDIO, "sdio read 53 addr 0x%x, %zu bytes",
 135                              addr, len);
 136                 wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len);
 137         }
 138
 139         if (ret)
 140                 wl1271_error("sdio read failed (%d)", ret);
 141 }
 142
 143 static void wl1271_sdio_raw_write(struct wl1271 *wl, int addr, void *buf,
 144                                   size_t len, bool fixed)
 145 {
 146         int ret;
 147         struct sdio_func *func = wl_to_func(wl);
 148
 149         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) {
 150                 sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
 151                 wl1271_debug(DEBUG_SDIO, "sdio write 52 addr 0x%x, byte 0x%02x",
 152                              addr, ((u8 *)buf)[0]);
 153         } else {
 154                 wl1271_debug(DEBUG_SDIO, "sdio write 53 addr 0x%x, %zu bytes",
 155                              addr, len);
 156                 wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len);
 157
 158                 if (fixed)
 159                         ret = sdio_writesb(func, addr, buf, len);
 160                 else
 161                         ret = sdio_memcpy_toio(func, addr, buf, len);
 162         }
 163
 164         if (ret)
 165                 wl1271_error("sdio write failed (%d)", ret);
 166 }
 167
 168 static int wl1271_sdio_power_on(struct wl1271 *wl)
 169 {
 170         struct sdio_func *func = wl_to_func(wl);
 171         int ret;
 172
 173         /* Make sure the card will not be powered off by runtime PM */
 174         ret = pm_runtime_get_sync(&func->dev);
 175         if (ret < 0)
 176                 goto out;
 177
 178         /* Runtime PM might be disabled, so power up the card manually */
 179         ret = mmc_power_restore_host(func->card->host);
 180         if (ret < 0)
 181                 goto out;
 182
 183         sdio_claim_host(func);
 184         sdio_enable_func(func);
 185
 186 out:
 187         return ret;
 188 }
 189
 190 static int wl1271_sdio_power_off(struct wl1271 *wl)
 191 {
 192         struct sdio_func *func = wl_to_func(wl);
 193         int ret;
 194
 195         sdio_disable_func(func);
 196         sdio_release_host(func);
 197
 198         /* Runtime PM might be disabled, so power off the card manually */
 199         ret = mmc_power_save_host(func->card->host);
 200         if (ret < 0)
 201                 return ret;
 202
 203         /* Let runtime PM know the card is powered off */
 204         return pm_runtime_put_sync(&func->dev);
 205 }
 206
 207 static int wl1271_sdio_set_power(struct wl1271 *wl, bool enable)
 208 {
 209         if (enable)
 210                 return wl1271_sdio_power_on(wl);
 211         else
 212                 return wl1271_sdio_power_off(wl);
 213 }
 214
 215 static struct wl1271_if_operations sdio_ops = {
 216         .read           = wl1271_sdio_raw_read,
 217         .write          = wl1271_sdio_raw_write,
 218         .reset          = wl1271_sdio_reset,
 219         .init           = wl1271_sdio_init,
 220         .power          = wl1271_sdio_set_power,
 221         .dev            = wl1271_sdio_wl_to_dev,
 222         .enable_irq     = wl1271_sdio_enable_interrupts,
 223         .disable_irq    = wl1271_sdio_disable_interrupts,
 224         .set_block_size = wl1271_sdio_set_block_size,
 225 };
 226
 227 static int __devinit wl1271_probe(struct sdio_func *func,
 228                                   const struct sdio_device_id *id)
 229 {
 230         struct ieee80211_hw *hw;
 231         const struct wl12xx_platform_data *wlan_data;
 232         struct wl1271 *wl;
 233         unsigned long irqflags;
 234         int ret;
 235
 236         /* We are only able to handle the wlan function */
 237         if (func->num != 0x02)
 238                 return -ENODEV;
 239
 240         hw = wl1271_alloc_hw();
 241         if (IS_ERR(hw))
 242                 return PTR_ERR(hw);
 243
 244         wl = hw->priv;
 245
 246         wl->if_priv = func;
 247         wl->if_ops = &sdio_ops;
 248
 249         /* Grab access to FN0 for ELP reg. */
 250         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
 251
 252         /* Use block mode for transferring over one block size of data */
 253         func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
 254
 255         wlan_data = wl12xx_get_platform_data();
 256         if (IS_ERR(wlan_data)) {
 257                 ret = PTR_ERR(wlan_data);
 258                 wl1271_error("missing wlan platform data: %d", ret);
 259                 goto out_free;
 260         }
 261
 262         wl->irq = wlan_data->irq;
 263         wl->ref_clock = wlan_data->board_ref_clock;
 264         wl->tcxo_clock = wlan_data->board_tcxo_clock;
 265         wl->platform_quirks = wlan_data->platform_quirks;
 266
 267         if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ)
 268                 irqflags = IRQF_TRIGGER_RISING;
 269         else
 270                 irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
 271
 272         ret = request_threaded_irq(wl->irq, wl1271_hardirq, wl1271_irq,
 273                                    irqflags,
 274                                    DRIVER_NAME, wl);
 275         if (ret < 0) {
 276                 wl1271_error("request_irq() failed: %d", ret);
 277                 goto out_free;
 278         }
 279
 280         enable_irq_wake(wl->irq);
 281         device_init_wakeup(wl1271_sdio_wl_to_dev(wl), 1);
 282
 283         disable_irq(wl->irq);
 284
 285         ret = wl1271_init_ieee80211(wl);
 286         if (ret)
 287                 goto out_irq;
 288
 289         ret = wl1271_register_hw(wl);
 290         if (ret)
 291                 goto out_irq;
 292
 293         sdio_set_drvdata(func, wl);
 294
 295         /* Tell PM core that we don't need the card to be powered now */
 296         pm_runtime_put_noidle(&func->dev);
 297
 298         wl1271_notice("initialized");
 299
 300         return 0;
 301
 302  out_irq:
 303         free_irq(wl->irq, wl);
 304
 305  out_free:
 306         wl1271_free_hw(wl);
 307
 308         return ret;
 309 }
 310
 311 static void __devexit wl1271_remove(struct sdio_func *func)
 312 {
 313         struct wl1271 *wl = sdio_get_drvdata(func);
 314
 315         /* Undo decrement done above in wl1271_probe */
 316         pm_runtime_get_noresume(&func->dev);
 317
 318         wl1271_unregister_hw(wl);
 319         device_init_wakeup(wl1271_sdio_wl_to_dev(wl), 0);
 320         disable_irq_wake(wl->irq);
 321         free_irq(wl->irq, wl);
 322         wl1271_free_hw(wl);
 323 }
 324
 325 static int wl1271_suspend(struct device *dev)
 326 {
 327         /* Tell MMC/SDIO core it's OK to power down the card
 328          * (if it isn't already), but not to remove it completely */
 329         struct sdio_func *func = dev_to_sdio_func(dev);
 330         struct wl1271 *wl = sdio_get_drvdata(func);
 331         mmc_pm_flag_t sdio_flags;
 332         int ret = 0;
 333
 334         wl1271_debug(DEBUG_MAC80211, "wl1271 suspend. wow_enabled: %d",
 335                      wl->wow_enabled);
 336
 337         /* check whether sdio should keep power */
 338         if (wl->wow_enabled) {
 339                 sdio_flags = sdio_get_host_pm_caps(func);
 340
 341                 if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
 342                         wl1271_error("can't keep power while host "
 343                                      "is suspended");
 344                         ret = -EINVAL;
 345                         goto out;
 346                 }
 347
 348                 /* keep power while host suspended */
 349                 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
 350                 if (ret) {
 351                         wl1271_error("error while trying to keep power");
 352                         goto out;
 353                 }
 354
 355                 /* release host */
 356                 sdio_release_host(func);
 357         }
 358 out:
 359         return ret;
 360 }
 361
 362 static int wl1271_resume(struct device *dev)
 363 {
 364         struct sdio_func *func = dev_to_sdio_func(dev);
 365         struct wl1271 *wl = sdio_get_drvdata(func);
 366
 367         wl1271_debug(DEBUG_MAC80211, "wl1271 resume");
 368         if (wl->wow_enabled) {
 369                 /* claim back host */
 370                 sdio_claim_host(func);
 371         }
 372
 373         return 0;
 374 }
 375
 376 static const struct dev_pm_ops wl1271_sdio_pm_ops = {
 377         .suspend        = wl1271_suspend,
 378         .resume         = wl1271_resume,
 379 };
 380
 381 static struct sdio_driver wl1271_sdio_driver = {
 382         .name           = "wl1271_sdio",
 383         .id_table       = wl1271_devices,
 384         .probe          = wl1271_probe,
 385         .remove         = __devexit_p(wl1271_remove),
 386         .drv = {
 387                 .pm = &wl1271_sdio_pm_ops,
 388         },
 389 };
 390
 391 static int __init wl1271_init(void)
 392 {
 393         int ret;
 394
 395         ret = sdio_register_driver(&wl1271_sdio_driver);
 396         if (ret < 0) {
 397                 wl1271_error("failed to register sdio driver: %d", ret);
 398                 goto out;
 399         }
 400
 401 out:
 402         return ret;
 403 }
 404
 405 static void __exit wl1271_exit(void)
 406 {
 407         sdio_unregister_driver(&wl1271_sdio_driver);
 408
 409         wl1271_notice("unloaded");
 410 }
 411
 412 module_init(wl1271_init);
 413 module_exit(wl1271_exit);
 414
 415 MODULE_LICENSE("GPL");
 416 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
 417 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
 418 MODULE_FIRMWARE(WL1271_FW_NAME);
 419 MODULE_FIRMWARE(WL128X_FW_NAME);
 420 MODULE_FIRMWARE(WL127X_AP_FW_NAME);
 421 MODULE_FIRMWARE(WL128X_AP_FW_NAME);