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 cw1200_sdio_lock(self); 112 cw1200_irq_handler(self->core); 113 cw1200_sdio_unlock(self); 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); 426