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