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 inline struct sdio_func *wl_to_func(struct wl1271 *wl)
  55 {
  56         return wl->if_priv;
  57 }
  58
  59 static struct device *wl1271_sdio_wl_to_dev(struct wl1271 *wl)
  60 {
  61         return &(wl_to_func(wl)->dev);
  62 }
  63
  64 static irqreturn_t wl1271_hardirq(int irq, void *cookie)
  65 {
  66         struct wl1271 *wl = cookie;
  67         unsigned long flags;
  68
  69         wl1271_debug(DEBUG_IRQ, "IRQ");
  70
  71         /* complete the ELP completion */
  72         spin_lock_irqsave(&wl->wl_lock, flags);
  73         set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags);
  74         if (wl->elp_compl) {
  75                 complete(wl->elp_compl);
  76                 wl->elp_compl = NULL;
  77         }
  78         spin_unlock_irqrestore(&wl->wl_lock, flags);
  79
  80         return IRQ_WAKE_THREAD;
  81 }
  82
  83 static void wl1271_sdio_disable_interrupts(struct wl1271 *wl)
  84 {
  85         disable_irq(wl->irq);
  86 }
  87
  88 static void wl1271_sdio_enable_interrupts(struct wl1271 *wl)
  89 {
  90         enable_irq(wl->irq);
  91 }
  92
  93 static void wl1271_sdio_reset(struct wl1271 *wl)
  94 {
  95 }
  96
  97 static void wl1271_sdio_init(struct wl1271 *wl)
  98 {
  99 }
 100
 101 static void wl1271_sdio_raw_read(struct wl1271 *wl, int addr, void *buf,
 102                                  size_t len, bool fixed)
 103 {
 104         int ret;
 105         struct sdio_func *func = wl_to_func(wl);
 106
 107         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) {
 108                 ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
 109                 wl1271_debug(DEBUG_SDIO, "sdio read 52 addr 0x%x, byte 0x%02x",
 110                              addr, ((u8 *)buf)[0]);
 111         } else {
 112                 if (fixed)
 113                         ret = sdio_readsb(func, buf, addr, len);
 114                 else
 115                         ret = sdio_memcpy_fromio(func, buf, addr, len);
 116
 117                 wl1271_debug(DEBUG_SDIO, "sdio read 53 addr 0x%x, %zu bytes",
 118                              addr, len);
 119                 wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len);
 120         }
 121
 122         if (ret)
 123                 wl1271_error("sdio read failed (%d)", ret);
 124 }
 125
 126 static void wl1271_sdio_raw_write(struct wl1271 *wl, int addr, void *buf,
 127                                   size_t len, bool fixed)
 128 {
 129         int ret;
 130         struct sdio_func *func = wl_to_func(wl);
 131
 132         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) {
 133                 sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
 134                 wl1271_debug(DEBUG_SDIO, "sdio write 52 addr 0x%x, byte 0x%02x",
 135                              addr, ((u8 *)buf)[0]);
 136         } else {
 137                 wl1271_debug(DEBUG_SDIO, "sdio write 53 addr 0x%x, %zu bytes",
 138                              addr, len);
 139                 wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len);
 140
 141                 if (fixed)
 142                         ret = sdio_writesb(func, addr, buf, len);
 143                 else
 144                         ret = sdio_memcpy_toio(func, addr, buf, len);
 145         }
 146
 147         if (ret)
 148                 wl1271_error("sdio write failed (%d)", ret);
 149 }
 150
 151 static int wl1271_sdio_power_on(struct wl1271 *wl)
 152 {
 153         struct sdio_func *func = wl_to_func(wl);
 154         int ret;
 155
 156         /* Make sure the card will not be powered off by runtime PM */
 157         ret = pm_runtime_get_sync(&func->dev);
 158         if (ret < 0)
 159                 goto out;
 160
 161         /* Runtime PM might be disabled, so power up the card manually */
 162         ret = mmc_power_restore_host(func->card->host);
 163         if (ret < 0)
 164                 goto out;
 165
 166         sdio_claim_host(func);
 167         sdio_enable_func(func);
 168
 169 out:
 170         return ret;
 171 }
 172
 173 static int wl1271_sdio_power_off(struct wl1271 *wl)
 174 {
 175         struct sdio_func *func = wl_to_func(wl);
 176         int ret;
 177
 178         sdio_disable_func(func);
 179         sdio_release_host(func);
 180
 181         /* Runtime PM might be disabled, so power off the card manually */
 182         ret = mmc_power_save_host(func->card->host);
 183         if (ret < 0)
 184                 return ret;
 185
 186         /* Let runtime PM know the card is powered off */
 187         return pm_runtime_put_sync(&func->dev);
 188 }
 189
 190 static int wl1271_sdio_set_power(struct wl1271 *wl, bool enable)
 191 {
 192         if (enable)
 193                 return wl1271_sdio_power_on(wl);
 194         else
 195                 return wl1271_sdio_power_off(wl);
 196 }
 197
 198 static struct wl1271_if_operations sdio_ops = {
 199         .read           = wl1271_sdio_raw_read,
 200         .write          = wl1271_sdio_raw_write,
 201         .reset          = wl1271_sdio_reset,
 202         .init           = wl1271_sdio_init,
 203         .power          = wl1271_sdio_set_power,
 204         .dev            = wl1271_sdio_wl_to_dev,
 205         .enable_irq     = wl1271_sdio_enable_interrupts,
 206         .disable_irq    = wl1271_sdio_disable_interrupts
 207 };
 208
 209 static int __devinit wl1271_probe(struct sdio_func *func,
 210                                   const struct sdio_device_id *id)
 211 {
 212         struct ieee80211_hw *hw;
 213         const struct wl12xx_platform_data *wlan_data;
 214         struct wl1271 *wl;
 215         int ret;
 216
 217         /* We are only able to handle the wlan function */
 218         if (func->num != 0x02)
 219                 return -ENODEV;
 220
 221         hw = wl1271_alloc_hw();
 222         if (IS_ERR(hw))
 223                 return PTR_ERR(hw);
 224
 225         wl = hw->priv;
 226
 227         wl->if_priv = func;
 228         wl->if_ops = &sdio_ops;
 229
 230         /* Grab access to FN0 for ELP reg. */
 231         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
 232
 233         wlan_data = wl12xx_get_platform_data();
 234         if (IS_ERR(wlan_data)) {
 235                 ret = PTR_ERR(wlan_data);
 236                 wl1271_error("missing wlan platform data: %d", ret);
 237                 goto out_free;
 238         }
 239
 240         wl->irq = wlan_data->irq;
 241         wl->ref_clock = wlan_data->board_ref_clock;
 242
 243         ret = request_threaded_irq(wl->irq, wl1271_hardirq, wl1271_irq,
 244                                    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 245                                    DRIVER_NAME, wl);
 246         if (ret < 0) {
 247                 wl1271_error("request_irq() failed: %d", ret);
 248                 goto out_free;
 249         }
 250
 251         disable_irq(wl->irq);
 252
 253         ret = wl1271_init_ieee80211(wl);
 254         if (ret)
 255                 goto out_irq;
 256
 257         ret = wl1271_register_hw(wl);
 258         if (ret)
 259                 goto out_irq;
 260
 261         sdio_set_drvdata(func, wl);
 262
 263         /* Tell PM core that we don't need the card to be powered now */
 264         pm_runtime_put_noidle(&func->dev);
 265
 266         wl1271_notice("initialized");
 267
 268         return 0;
 269
 270  out_irq:
 271         free_irq(wl->irq, wl);
 272
 273  out_free:
 274         wl1271_free_hw(wl);
 275
 276         return ret;
 277 }
 278
 279 static void __devexit wl1271_remove(struct sdio_func *func)
 280 {
 281         struct wl1271 *wl = sdio_get_drvdata(func);
 282
 283         /* Undo decrement done above in wl1271_probe */
 284         pm_runtime_get_noresume(&func->dev);
 285
 286         wl1271_unregister_hw(wl);
 287         free_irq(wl->irq, wl);
 288         wl1271_free_hw(wl);
 289 }
 290
 291 static int wl1271_suspend(struct device *dev)
 292 {
 293         /* Tell MMC/SDIO core it's OK to power down the card
 294          * (if it isn't already), but not to remove it completely */
 295         return 0;
 296 }
 297
 298 static int wl1271_resume(struct device *dev)
 299 {
 300         return 0;
 301 }
 302
 303 static const struct dev_pm_ops wl1271_sdio_pm_ops = {
 304         .suspend        = wl1271_suspend,
 305         .resume         = wl1271_resume,
 306 };
 307
 308 static struct sdio_driver wl1271_sdio_driver = {
 309         .name           = "wl1271_sdio",
 310         .id_table       = wl1271_devices,
 311         .probe          = wl1271_probe,
 312         .remove         = __devexit_p(wl1271_remove),
 313         .drv = {
 314                 .pm = &wl1271_sdio_pm_ops,
 315         },
 316 };
 317
 318 static int __init wl1271_init(void)
 319 {
 320         int ret;
 321
 322         ret = sdio_register_driver(&wl1271_sdio_driver);
 323         if (ret < 0) {
 324                 wl1271_error("failed to register sdio driver: %d", ret);
 325                 goto out;
 326         }
 327
 328 out:
 329         return ret;
 330 }
 331
 332 static void __exit wl1271_exit(void)
 333 {
 334         sdio_unregister_driver(&wl1271_sdio_driver);
 335
 336         wl1271_notice("unloaded");
 337 }
 338
 339 module_init(wl1271_init);
 340 module_exit(wl1271_exit);
 341
 342 MODULE_LICENSE("GPL");
 343 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
 344 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
 345 MODULE_FIRMWARE(WL1271_FW_NAME);
 346 MODULE_FIRMWARE(WL1271_AP_FW_NAME);