drivers/net/wireless/st/cw1200/cw1200_sdio.c

   1 /*
   2  * Mac80211 SDIO driver for ST-Ericsson CW1200 device
   3  *
   4  * Copyright (c) 2010, ST-Ericsson
   5  * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/gpio.h>
  15 #include <linux/delay.h>
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/sdio_func.h>
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/sdio.h>
  20 #include <net/mac80211.h>
  21
  22 #include "cw1200.h"
  23 #include "hwbus.h"
  24 #include <linux/platform_data/net-cw1200.h>
  25 #include "hwio.h"
  26
  27 MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>");
  28 MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
  29 MODULE_LICENSE("GPL");
  30
  31 #define SDIO_BLOCK_SIZE (512)
  32
  33 /* Default platform data for Sagrad modules */
  34 static struct cw1200_platform_data_sdio sagrad_109x_evk_platform_data = {
  35         .ref_clk = 38400,
  36         .have_5ghz = false,
  37         .sdd_file = "sdd_sagrad_1091_1098.bin",
  38 };
  39
  40 /* Allow platform data to be overridden */
  41 static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data;
  42
  43 void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata)
  44 {
  45         global_plat_data = pdata;
  46 }
  47
  48 struct hwbus_priv {
  49         struct sdio_func        *func;
  50         struct cw1200_common    *core;
  51         const struct cw1200_platform_data_sdio *pdata;
  52 };
  53
  54 #ifndef SDIO_VENDOR_ID_STE
  55 #define SDIO_VENDOR_ID_STE              0x0020
  56 #endif
  57
  58 #ifndef SDIO_DEVICE_ID_STE_CW1200
  59 #define SDIO_DEVICE_ID_STE_CW1200       0x2280
  60 #endif
  61
  62 static const struct sdio_device_id cw1200_sdio_ids[] = {
  63         { SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) },
  64         { /* end: all zeroes */                 },
  65 };
  66
  67 /* hwbus_ops implemetation */
  68
  69 static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self,
  70                                      unsigned int addr,
  71                                      void *dst, int count)
  72 {
  73         return sdio_memcpy_fromio(self->func, dst, addr, count);
  74 }
  75
  76 static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self,
  77                                    unsigned int addr,
  78                                    const void *src, int count)
  79 {
  80         return sdio_memcpy_toio(self->func, addr, (void *)src, count);
  81 }
  82
  83 static void cw1200_sdio_lock(struct hwbus_priv *self)
  84 {
  85         sdio_claim_host(self->func);
  86 }
  87
  88 static void cw1200_sdio_unlock(struct hwbus_priv *self)
  89 {
  90         sdio_release_host(self->func);
  91 }
  92
  93 static void cw1200_sdio_irq_handler(struct sdio_func *func)
  94 {
  95         struct hwbus_priv *self = sdio_get_drvdata(func);
  96
  97         /* note:  sdio_host already claimed here. */
  98         if (self->core)
  99                 cw1200_irq_handler(self->core);
 100 }
 101
 102 static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
 103 {
 104         return IRQ_WAKE_THREAD;
 105 }
 106
 107 static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
 108 {
 109         struct hwbus_priv *self = dev_id;
 110
 111         if (self->core) {
 112                 cw1200_sdio_lock(self);
 113                 cw1200_irq_handler(self->core);
 114                 cw1200_sdio_unlock(self);
 115                 return IRQ_HANDLED;
 116         } else {
 117                 return IRQ_NONE;
 118         }
 119 }
 120
 121 static int cw1200_request_irq(struct hwbus_priv *self)
 122 {
 123         int ret;
 124         u8 cccr;
 125
 126         cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret);
 127         if (WARN_ON(ret))
 128                 goto err;
 129
 130         /* Master interrupt enable ... */
 131         cccr |= BIT(0);
 132
 133         /* ... for our function */
 134         cccr |= BIT(self->func->num);
 135
 136         sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
 137         if (WARN_ON(ret))
 138                 goto err;
 139
 140         ret = enable_irq_wake(self->pdata->irq);
 141         if (WARN_ON(ret))
 142                 goto err;
 143
 144         /* Request the IRQ */
 145         ret =  request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq,
 146                                     cw1200_gpio_irq,
 147                                     IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 148                                     "cw1200_wlan_irq", self);
 149         if (WARN_ON(ret))
 150                 goto err;
 151
 152         return 0;
 153
 154 err:
 155         return ret;
 156 }
 157
 158 static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self)
 159 {
 160         int ret = 0;
 161
 162         pr_debug("SW IRQ subscribe\n");
 163         sdio_claim_host(self->func);
 164         if (self->pdata->irq)
 165                 ret = cw1200_request_irq(self);
 166         else
 167                 ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);
 168
 169         sdio_release_host(self->func);
 170         return ret;
 171 }
 172
 173 static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self)
 174 {
 175         int ret = 0;
 176
 177         pr_debug("SW IRQ unsubscribe\n");
 178
 179         if (self->pdata->irq) {
 180                 disable_irq_wake(self->pdata->irq);
 181                 free_irq(self->pdata->irq, self);
 182         } else {
 183                 sdio_claim_host(self->func);
 184                 ret = sdio_release_irq(self->func);
 185                 sdio_release_host(self->func);
 186         }
 187         return ret;
 188 }
 189
 190 static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
 191 {
 192         if (pdata->reset) {
 193                 gpio_set_value(pdata->reset, 0);
 194                 msleep(30); /* Min is 2 * CLK32K cycles */
 195                 gpio_free(pdata->reset);
 196         }
 197
 198         if (pdata->power_ctrl)
 199                 pdata->power_ctrl(pdata, false);
 200         if (pdata->clk_ctrl)
 201                 pdata->clk_ctrl(pdata, false);
 202
 203         return 0;
 204 }
 205
 206 static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
 207 {
 208         /* Ensure I/Os are pulled low */
 209         if (pdata->reset) {
 210                 gpio_request(pdata->reset, "cw1200_wlan_reset");
 211                 gpio_direction_output(pdata->reset, 0);
 212         }
 213         if (pdata->powerup) {
 214                 gpio_request(pdata->powerup, "cw1200_wlan_powerup");
 215                 gpio_direction_output(pdata->powerup, 0);
 216         }
 217         if (pdata->reset || pdata->powerup)
 218                 msleep(10); /* Settle time? */
 219
 220         /* Enable 3v3 and 1v8 to hardware */
 221         if (pdata->power_ctrl) {
 222                 if (pdata->power_ctrl(pdata, true)) {
 223                         pr_err("power_ctrl() failed!\n");
 224                         return -1;
 225                 }
 226         }
 227
 228         /* Enable CLK32K */
 229         if (pdata->clk_ctrl) {
 230                 if (pdata->clk_ctrl(pdata, true)) {
 231                         pr_err("clk_ctrl() failed!\n");
 232                         return -1;
 233                 }
 234                 msleep(10); /* Delay until clock is stable for 2 cycles */
 235         }
 236
 237         /* Enable POWERUP signal */
 238         if (pdata->powerup) {
 239                 gpio_set_value(pdata->powerup, 1);
 240                 msleep(250); /* or more..? */
 241         }
 242         /* Enable RSTn signal */
 243         if (pdata->reset) {
 244                 gpio_set_value(pdata->reset, 1);
 245                 msleep(50); /* Or more..? */
 246         }
 247         return 0;
 248 }
 249
 250 static size_t cw1200_sdio_align_size(struct hwbus_priv *self, size_t size)
 251 {
 252         if (self->pdata->no_nptb)
 253                 size = round_up(size, SDIO_BLOCK_SIZE);
 254         else
 255                 size = sdio_align_size(self->func, size);
 256
 257         return size;
 258 }
 259
 260 static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend)
 261 {
 262         int ret = 0;
 263
 264         if (self->pdata->irq)
 265                 ret = irq_set_irq_wake(self->pdata->irq, suspend);
 266         return ret;
 267 }
 268
 269 static const struct hwbus_ops cw1200_sdio_hwbus_ops = {
 270         .hwbus_memcpy_fromio    = cw1200_sdio_memcpy_fromio,
 271         .hwbus_memcpy_toio      = cw1200_sdio_memcpy_toio,
 272         .lock                   = cw1200_sdio_lock,
 273         .unlock                 = cw1200_sdio_unlock,
 274         .align_size             = cw1200_sdio_align_size,
 275         .power_mgmt             = cw1200_sdio_pm,
 276 };
 277
 278 /* Probe Function to be called by SDIO stack when device is discovered */
 279 static int cw1200_sdio_probe(struct sdio_func *func,
 280                              const struct sdio_device_id *id)
 281 {
 282         struct hwbus_priv *self;
 283         int status;
 284
 285         pr_info("cw1200_wlan_sdio: Probe called\n");
 286
 287         /* We are only able to handle the wlan function */
 288         if (func->num != 0x01)
 289                 return -ENODEV;
 290
 291         self = kzalloc(sizeof(*self), GFP_KERNEL);
 292         if (!self) {
 293                 pr_err("Can't allocate SDIO hwbus_priv.\n");
 294                 return -ENOMEM;
 295         }
 296
 297         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
 298
 299         self->pdata = global_plat_data; /* FIXME */
 300         self->func = func;
 301         sdio_set_drvdata(func, self);
 302         sdio_claim_host(func);
 303         sdio_enable_func(func);
 304         sdio_release_host(func);
 305
 306         status = cw1200_sdio_irq_subscribe(self);
 307
 308         status = cw1200_core_probe(&cw1200_sdio_hwbus_ops,
 309                                    self, &func->dev, &self->core,
 310                                    self->pdata->ref_clk,
 311                                    self->pdata->macaddr,
 312                                    self->pdata->sdd_file,
 313                                    self->pdata->have_5ghz);
 314         if (status) {
 315                 cw1200_sdio_irq_unsubscribe(self);
 316                 sdio_claim_host(func);
 317                 sdio_disable_func(func);
 318                 sdio_release_host(func);
 319                 sdio_set_drvdata(func, NULL);
 320                 kfree(self);
 321         }
 322
 323         return status;
 324 }
 325
 326 /* Disconnect Function to be called by SDIO stack when
 327  * device is disconnected
 328  */
 329 static void cw1200_sdio_disconnect(struct sdio_func *func)
 330 {
 331         struct hwbus_priv *self = sdio_get_drvdata(func);
 332
 333         if (self) {
 334                 cw1200_sdio_irq_unsubscribe(self);
 335                 if (self->core) {
 336                         cw1200_core_release(self->core);
 337                         self->core = NULL;
 338                 }
 339                 sdio_claim_host(func);
 340                 sdio_disable_func(func);
 341                 sdio_release_host(func);
 342                 sdio_set_drvdata(func, NULL);
 343                 kfree(self);
 344         }
 345 }
 346
 347 #ifdef CONFIG_PM
 348 static int cw1200_sdio_suspend(struct device *dev)
 349 {
 350         int ret;
 351         struct sdio_func *func = dev_to_sdio_func(dev);
 352         struct hwbus_priv *self = sdio_get_drvdata(func);
 353
 354         if (!cw1200_can_suspend(self->core))
 355                 return -EAGAIN;
 356
 357         /* Notify SDIO that CW1200 will remain powered during suspend */
 358         ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
 359         if (ret)
 360                 pr_err("Error setting SDIO pm flags: %i\n", ret);
 361
 362         return ret;
 363 }
 364
 365 static int cw1200_sdio_resume(struct device *dev)
 366 {
 367         return 0;
 368 }
 369
 370 static const struct dev_pm_ops cw1200_pm_ops = {
 371         .suspend = cw1200_sdio_suspend,
 372         .resume = cw1200_sdio_resume,
 373 };
 374 #endif
 375
 376 static struct sdio_driver sdio_driver = {
 377         .name           = "cw1200_wlan_sdio",
 378         .id_table       = cw1200_sdio_ids,
 379         .probe          = cw1200_sdio_probe,
 380         .remove         = cw1200_sdio_disconnect,
 381 #ifdef CONFIG_PM
 382         .drv = {
 383                 .pm = &cw1200_pm_ops,
 384         }
 385 #endif
 386 };
 387
 388 /* Init Module function -> Called by insmod */
 389 static int __init cw1200_sdio_init(void)
 390 {
 391         const struct cw1200_platform_data_sdio *pdata;
 392         int ret;
 393
 394         /* FIXME -- this won't support multiple devices */
 395         pdata = global_plat_data;
 396
 397         if (cw1200_sdio_on(pdata)) {
 398                 ret = -1;
 399                 goto err;
 400         }
 401
 402         ret = sdio_register_driver(&sdio_driver);
 403         if (ret)
 404                 goto err;
 405
 406         return 0;
 407
 408 err:
 409         cw1200_sdio_off(pdata);
 410         return ret;
 411 }
 412
 413 /* Called at Driver Unloading */
 414 static void __exit cw1200_sdio_exit(void)
 415 {
 416         const struct cw1200_platform_data_sdio *pdata;
 417
 418         /* FIXME -- this won't support multiple devices */
 419         pdata = global_plat_data;
 420         sdio_unregister_driver(&sdio_driver);
 421         cw1200_sdio_off(pdata);
 422 }
 423
 424
 425 module_init(cw1200_sdio_init);
 426 module_exit(cw1200_sdio_exit);