drivers/net/wireless/wl12xx/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
  30 #include "wl1251.h"
  31
  32 #ifndef SDIO_VENDOR_ID_TI
  33 #define SDIO_VENDOR_ID_TI               0x104c
  34 #endif
  35
  36 #ifndef SDIO_DEVICE_ID_TI_WL1251
  37 #define SDIO_DEVICE_ID_TI_WL1251        0x9066
  38 #endif
  39
  40 struct wl1251_sdio {
  41         struct sdio_func *func;
  42         u32 elp_val;
  43 };
  44
  45 static struct wl12xx_platform_data *wl12xx_board_data;
  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 void wl1251_sdio_set_power(bool enable)
 175 {
 176 }
 177
 178 static struct wl1251_if_operations wl1251_sdio_ops = {
 179         .read = wl1251_sdio_read,
 180         .write = wl1251_sdio_write,
 181         .write_elp = wl1251_sdio_write_elp,
 182         .read_elp = wl1251_sdio_read_elp,
 183         .reset = wl1251_sdio_reset,
 184 };
 185
 186 static int wl1251_platform_probe(struct platform_device *pdev)
 187 {
 188         if (pdev->id != -1) {
 189                 wl1251_error("can only handle single device");
 190                 return -ENODEV;
 191         }
 192
 193         wl12xx_board_data = pdev->dev.platform_data;
 194         return 0;
 195 }
 196
 197 /*
 198  * Dummy platform_driver for passing platform_data to this driver,
 199  * until we have a way to pass this through SDIO subsystem or
 200  * some other way.
 201  */
 202 static struct platform_driver wl1251_platform_driver = {
 203         .driver = {
 204                 .name   = "wl1251_data",
 205                 .owner  = THIS_MODULE,
 206         },
 207         .probe  = wl1251_platform_probe,
 208 };
 209
 210 static int wl1251_sdio_probe(struct sdio_func *func,
 211                              const struct sdio_device_id *id)
 212 {
 213         int ret;
 214         struct wl1251 *wl;
 215         struct ieee80211_hw *hw;
 216         struct wl1251_sdio *wl_sdio;
 217
 218         hw = wl1251_alloc_hw();
 219         if (IS_ERR(hw))
 220                 return PTR_ERR(hw);
 221
 222         wl = hw->priv;
 223
 224         wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
 225         if (wl_sdio == NULL) {
 226                 ret = -ENOMEM;
 227                 goto out_free_hw;
 228         }
 229
 230         sdio_claim_host(func);
 231         ret = sdio_enable_func(func);
 232         if (ret)
 233                 goto release;
 234
 235         sdio_set_block_size(func, 512);
 236         sdio_release_host(func);
 237
 238         SET_IEEE80211_DEV(hw, &func->dev);
 239         wl_sdio->func = func;
 240         wl->if_priv = wl_sdio;
 241         wl->if_ops = &wl1251_sdio_ops;
 242         wl->set_power = wl1251_sdio_set_power;
 243
 244         if (wl12xx_board_data != NULL) {
 245                 wl->set_power = wl12xx_board_data->set_power;
 246                 wl->irq = wl12xx_board_data->irq;
 247                 wl->use_eeprom = wl12xx_board_data->use_eeprom;
 248         }
 249
 250         if (wl->irq) {
 251                 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
 252                 if (ret < 0) {
 253                         wl1251_error("request_irq() failed: %d", ret);
 254                         goto disable;
 255                 }
 256
 257                 set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 258                 disable_irq(wl->irq);
 259
 260                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
 261                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
 262
 263                 wl1251_info("using dedicated interrupt line");
 264         } else {
 265                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
 266                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
 267
 268                 wl1251_info("using SDIO interrupt");
 269         }
 270
 271         ret = wl1251_init_ieee80211(wl);
 272         if (ret)
 273                 goto out_free_irq;
 274
 275         sdio_set_drvdata(func, wl);
 276         return ret;
 277
 278 out_free_irq:
 279         if (wl->irq)
 280                 free_irq(wl->irq, wl);
 281 disable:
 282         sdio_claim_host(func);
 283         sdio_disable_func(func);
 284 release:
 285         sdio_release_host(func);
 286         kfree(wl_sdio);
 287 out_free_hw:
 288         wl1251_free_hw(wl);
 289         return ret;
 290 }
 291
 292 static void __devexit wl1251_sdio_remove(struct sdio_func *func)
 293 {
 294         struct wl1251 *wl = sdio_get_drvdata(func);
 295         struct wl1251_sdio *wl_sdio = wl->if_priv;
 296
 297         if (wl->irq)
 298                 free_irq(wl->irq, wl);
 299         kfree(wl_sdio);
 300         wl1251_free_hw(wl);
 301
 302         sdio_claim_host(func);
 303         sdio_release_irq(func);
 304         sdio_disable_func(func);
 305         sdio_release_host(func);
 306 }
 307
 308 static struct sdio_driver wl1251_sdio_driver = {
 309         .name           = "wl1251_sdio",
 310         .id_table       = wl1251_devices,
 311         .probe          = wl1251_sdio_probe,
 312         .remove         = __devexit_p(wl1251_sdio_remove),
 313 };
 314
 315 static int __init wl1251_sdio_init(void)
 316 {
 317         int err;
 318
 319         err = platform_driver_register(&wl1251_platform_driver);
 320         if (err) {
 321                 wl1251_error("failed to register platform driver: %d", err);
 322                 return err;
 323         }
 324
 325         err = sdio_register_driver(&wl1251_sdio_driver);
 326         if (err)
 327                 wl1251_error("failed to register sdio driver: %d", err);
 328         return err;
 329 }
 330
 331 static void __exit wl1251_sdio_exit(void)
 332 {
 333         sdio_unregister_driver(&wl1251_sdio_driver);
 334         platform_driver_unregister(&wl1251_platform_driver);
 335         wl1251_notice("unloaded");
 336 }
 337
 338 module_init(wl1251_sdio_init);
 339 module_exit(wl1251_sdio_exit);
 340
 341 MODULE_LICENSE("GPL");
 342 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");