drivers/net/wireless/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/version.h>
  13 #include <linux/module.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 "sbus.h"
  24 #include <linux/cw1200_platform.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 struct sbus_priv {
  34         struct sdio_func        *func;
  35         struct cw1200_common    *core;
  36         const struct cw1200_platform_data_sdio *pdata;
  37 };
  38
  39 #ifndef SDIO_VENDOR_ID_STE
  40 #define SDIO_VENDOR_ID_STE              0x0020
  41 #endif
  42
  43 #ifndef SDIO_DEVICE_ID_STE_CW1200
  44 #define SDIO_DEVICE_ID_STE_CW1200       0x2280
  45 #endif
  46
  47 static const struct sdio_device_id cw1200_sdio_ids[] = {
  48         { SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) },
  49         { /* end: all zeroes */                 },
  50 };
  51
  52 /* sbus_ops implemetation */
  53
  54 static int cw1200_sdio_memcpy_fromio(struct sbus_priv *self,
  55                                      unsigned int addr,
  56                                      void *dst, int count)
  57 {
  58         return sdio_memcpy_fromio(self->func, dst, addr, count);
  59 }
  60
  61 static int cw1200_sdio_memcpy_toio(struct sbus_priv *self,
  62                                    unsigned int addr,
  63                                    const void *src, int count)
  64 {
  65         return sdio_memcpy_toio(self->func, addr, (void *)src, count);
  66 }
  67
  68 static void cw1200_sdio_lock(struct sbus_priv *self)
  69 {
  70         sdio_claim_host(self->func);
  71 }
  72
  73 static void cw1200_sdio_unlock(struct sbus_priv *self)
  74 {
  75         sdio_release_host(self->func);
  76 }
  77
  78 static void cw1200_sdio_irq_handler(struct sdio_func *func)
  79 {
  80         struct sbus_priv *self = sdio_get_drvdata(func);
  81
  82         /* note:  sdio_host already claimed here. */
  83         if (self->core)
  84                 cw1200_irq_handler(self->core);
  85 }
  86
  87 static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
  88 {
  89         return IRQ_WAKE_THREAD;
  90 }
  91
  92 static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
  93 {
  94         struct sbus_priv *self = dev_id;
  95
  96         if (self->core) {
  97                 sdio_claim_host(self->func);
  98                 cw1200_irq_handler(self->core);
  99                 sdio_release_host(self->func);
 100                 return IRQ_HANDLED;
 101         } else {
 102                 return IRQ_NONE;
 103         }
 104 }
 105
 106 static int cw1200_request_irq(struct sbus_priv *self)
 107 {
 108         int ret;
 109         const struct resource *irq = self->pdata->irq;
 110         u8 cccr;
 111
 112         cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret);
 113         if (WARN_ON(ret))
 114                 goto err;
 115
 116         /* Master interrupt enable ... */
 117         cccr |= BIT(0);
 118
 119         /* ... for our function */
 120         cccr |= BIT(self->func->num);
 121
 122         sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
 123         if (WARN_ON(ret))
 124                 goto err;
 125
 126         ret = enable_irq_wake(irq->start);
 127         if (WARN_ON(ret))
 128                 goto err;
 129
 130         /* Request the IRQ */
 131         ret =  request_threaded_irq(irq->start, cw1200_gpio_hardirq,
 132                                     cw1200_gpio_irq,
 133                                     IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 134                                     irq->name, self);
 135         if (WARN_ON(ret))
 136                 goto err;
 137
 138         return 0;
 139
 140 err:
 141         return ret;
 142 }
 143
 144 static int cw1200_sdio_irq_subscribe(struct sbus_priv *self)
 145 {
 146         int ret = 0;
 147
 148         pr_debug("SW IRQ subscribe\n");
 149         sdio_claim_host(self->func);
 150         if (self->pdata->irq)
 151                 ret = cw1200_request_irq(self);
 152         else
 153                 ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);
 154
 155         sdio_release_host(self->func);
 156         return ret;
 157 }
 158
 159 static int cw1200_sdio_irq_unsubscribe(struct sbus_priv *self)
 160 {
 161         int ret = 0;
 162
 163         pr_debug("SW IRQ unsubscribe\n");
 164
 165         if (self->pdata->irq) {
 166                 disable_irq_wake(self->pdata->irq->start);
 167                 free_irq(self->pdata->irq->start, self);
 168         } else {
 169                 sdio_claim_host(self->func);
 170                 ret = sdio_release_irq(self->func);
 171                 sdio_release_host(self->func);
 172         }
 173         return ret;
 174 }
 175
 176 static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
 177 {
 178         const struct resource *reset = pdata->reset;
 179
 180         if (reset) {
 181                 gpio_set_value(reset->start, 0);
 182                 msleep(30); /* Min is 2 * CLK32K cycles */
 183                 gpio_free(reset->start);
 184         }
 185
 186         if (pdata->power_ctrl)
 187                 pdata->power_ctrl(pdata, false);
 188         if (pdata->clk_ctrl)
 189                 pdata->clk_ctrl(pdata, false);
 190
 191         return 0;
 192 }
 193
 194 static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
 195 {
 196         const struct resource *reset = pdata->reset;
 197         const struct resource *powerup = pdata->reset;
 198
 199         /* Ensure I/Os are pulled low */
 200         if (reset) {
 201                 gpio_request(reset->start, reset->name);
 202                 gpio_direction_output(reset->start, 0);
 203         }
 204         if (powerup) {
 205                 gpio_request(powerup->start, powerup->name);
 206                 gpio_direction_output(powerup->start, 0);
 207         }
 208         if (reset || powerup)
 209                 msleep(50); /* Settle time */
 210
 211         /* Enable 3v3 and 1v8 to hardware */
 212         if (pdata->power_ctrl) {
 213                 if (pdata->power_ctrl(pdata, true)) {
 214                         pr_err("power_ctrl() failed!\n");
 215                         return -1;
 216                 }
 217         }
 218
 219         /* Enable CLK32K */
 220         if (pdata->clk_ctrl) {
 221                 if (pdata->clk_ctrl(pdata, true)) {
 222                         pr_err("clk_ctrl() failed!\n");
 223                         return -1;
 224                 }
 225                 msleep(10); /* Delay until clock is stable for 2 cycles */
 226         }
 227
 228         /* Enable POWERUP signal */
 229         if (powerup) {
 230                 gpio_set_value(powerup->start, 1);
 231                 msleep(250); /* or more..? */
 232         }
 233         /* Enable RSTn signal */
 234         if (reset) {
 235                 gpio_set_value(reset->start, 1);
 236                 msleep(50); /* Or more..? */
 237         }
 238         return 0;
 239 }
 240
 241 static size_t cw1200_sdio_align_size(struct sbus_priv *self, size_t size)
 242 {
 243         if (self->pdata->no_nptb)
 244                 size = round_up(size, SDIO_BLOCK_SIZE);
 245         else
 246                 size = sdio_align_size(self->func, size);
 247
 248         return size;
 249 }
 250
 251 static int cw1200_sdio_pm(struct sbus_priv *self, bool suspend)
 252 {
 253         int ret = 0;
 254
 255         if (self->pdata->irq)
 256                 ret = irq_set_irq_wake(self->pdata->irq->start, suspend);
 257         return ret;
 258 }
 259
 260 static struct sbus_ops cw1200_sdio_sbus_ops = {
 261         .sbus_memcpy_fromio     = cw1200_sdio_memcpy_fromio,
 262         .sbus_memcpy_toio       = cw1200_sdio_memcpy_toio,
 263         .lock                   = cw1200_sdio_lock,
 264         .unlock                 = cw1200_sdio_unlock,
 265         .align_size             = cw1200_sdio_align_size,
 266         .power_mgmt             = cw1200_sdio_pm,
 267 };
 268
 269 /* Probe Function to be called by SDIO stack when device is discovered */
 270 static int cw1200_sdio_probe(struct sdio_func *func,
 271                                        const struct sdio_device_id *id)
 272 {
 273         struct sbus_priv *self;
 274         int status;
 275
 276         pr_info("cw1200_wlan_sdio: Probe called\n");
 277
 278        /* We are only able to handle the wlan function */
 279         if (func->num != 0x01)
 280                 return -ENODEV;
 281
 282         self = kzalloc(sizeof(*self), GFP_KERNEL);
 283         if (!self) {
 284                 pr_err("Can't allocate SDIO sbus_priv.\n");
 285                 return -ENOMEM;
 286         }
 287
 288         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
 289
 290         self->pdata = cw1200_get_platform_data();
 291         self->func = func;
 292         sdio_set_drvdata(func, self);
 293         sdio_claim_host(func);
 294         sdio_enable_func(func);
 295         sdio_release_host(func);
 296
 297         status = cw1200_sdio_irq_subscribe(self);
 298
 299         status = cw1200_core_probe(&cw1200_sdio_sbus_ops,
 300                                    self, &func->dev, &self->core,
 301                                    self->pdata->ref_clk,
 302                                    self->pdata->macaddr,
 303                                    self->pdata->sdd_file,
 304                                    self->pdata->have_5ghz);
 305         if (status) {
 306                 cw1200_sdio_irq_unsubscribe(self);
 307                 sdio_claim_host(func);
 308                 sdio_disable_func(func);
 309                 sdio_release_host(func);
 310                 sdio_set_drvdata(func, NULL);
 311                 kfree(self);
 312         }
 313
 314         return status;
 315 }
 316
 317 /* Disconnect Function to be called by SDIO stack when
 318  * device is disconnected */
 319 static void cw1200_sdio_disconnect(struct sdio_func *func)
 320 {
 321         struct sbus_priv *self = sdio_get_drvdata(func);
 322
 323         if (self) {
 324                 cw1200_sdio_irq_unsubscribe(self);
 325                 if (self->core) {
 326                         cw1200_core_release(self->core);
 327                         self->core = NULL;
 328                 }
 329                 sdio_claim_host(func);
 330                 sdio_disable_func(func);
 331                 sdio_release_host(func);
 332                 sdio_set_drvdata(func, NULL);
 333                 kfree(self);
 334         }
 335 }
 336
 337 static int cw1200_sdio_suspend(struct device *dev)
 338 {
 339         int ret;
 340         struct sdio_func *func = dev_to_sdio_func(dev);
 341         struct sbus_priv *self = sdio_get_drvdata(func);
 342
 343         if (!cw1200_can_suspend(self->core))
 344                 return -EAGAIN;
 345
 346         /* Notify SDIO that CW1200 will remain powered during suspend */
 347         ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
 348         if (ret)
 349                 pr_err("Error setting SDIO pm flags: %i\n", ret);
 350
 351         return ret;
 352 }
 353
 354 static int cw1200_sdio_resume(struct device *dev)
 355 {
 356         return 0;
 357 }
 358
 359 static const struct dev_pm_ops cw1200_pm_ops = {
 360         .suspend = cw1200_sdio_suspend,
 361         .resume = cw1200_sdio_resume,
 362 };
 363
 364 static struct sdio_driver sdio_driver = {
 365         .name           = "cw1200_wlan_sdio",
 366         .id_table       = cw1200_sdio_ids,
 367         .probe          = cw1200_sdio_probe,
 368         .remove         = cw1200_sdio_disconnect,
 369         .drv = {
 370                 .pm = &cw1200_pm_ops,
 371         }
 372 };
 373
 374 /* Init Module function -> Called by insmod */
 375 static int __init cw1200_sdio_init(void)
 376 {
 377         const struct cw1200_platform_data_sdio *pdata;
 378         int ret;
 379
 380         pdata = cw1200_get_platform_data();
 381
 382         if (cw1200_sdio_on(pdata)) {
 383                 ret = -1;
 384                 goto err;
 385         }
 386
 387         ret = sdio_register_driver(&sdio_driver);
 388         if (ret)
 389                 goto err;
 390
 391         return 0;
 392
 393 err:
 394         cw1200_sdio_off(pdata);
 395         return ret;
 396 }
 397
 398 /* Called at Driver Unloading */
 399 static void __exit cw1200_sdio_exit(void)
 400 {
 401         const struct cw1200_platform_data_sdio *pdata;
 402         pdata = cw1200_get_platform_data();
 403         sdio_unregister_driver(&sdio_driver);
 404         cw1200_sdio_off(pdata);
 405 }
 406
 407
 408 module_init(cw1200_sdio_init);
 409 module_exit(cw1200_sdio_exit);