1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Mac80211 SDIO driver for ST-Ericsson CW1200 device 4 * 5 * Copyright (c) 2010, ST-Ericsson 6 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/interrupt.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/delay.h> 13 #include <linux/mmc/host.h> 14 #include <linux/mmc/sdio_func.h> 15 #include <linux/mmc/card.h> 16 #include <linux/mmc/sdio.h> 17 #include <linux/mmc/sdio_ids.h> 18 #include <net/mac80211.h> 19 20 #include "cw1200.h" 21 #include "hwbus.h" 22 #include <linux/platform_data/net-cw1200.h> 23 #include "hwio.h" 24 25 MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>"); 26 MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver"); 27 MODULE_LICENSE("GPL"); 28 29 #define SDIO_BLOCK_SIZE (512) 30 31 /* Default platform data for Sagrad modules */ 32 static struct cw1200_platform_data_sdio sagrad_109x_evk_platform_data = { 33 .ref_clk = 38400, 34 .have_5ghz = false, 35 .sdd_file = "sdd_sagrad_1091_1098.bin", 36 }; 37 38 /* Allow platform data to be overridden */ 39 static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data; 40 41 void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata) 42 { 43 global_plat_data = pdata; 44 } 45 46 struct hwbus_priv { 47 struct sdio_func *func; 48 struct cw1200_common *core; 49 const struct cw1200_platform_data_sdio *pdata; 50 }; 51 52 static const struct sdio_device_id cw1200_sdio_ids[] = { 53 { SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) }, 54 { /* end: all zeroes */ }, 55 }; 56 MODULE_DEVICE_TABLE(sdio, cw1200_sdio_ids); 57 58 /* hwbus_ops implemetation */ 59 60 static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self, 61 unsigned int addr, 62 void *dst, int count) 63 { 64 return sdio_memcpy_fromio(self->func, dst, addr, count); 65 } 66 67 static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self, 68 unsigned int addr, 69 const void *src, int count) 70 { 71 return sdio_memcpy_toio(self->func, addr, (void *)src, count); 72 } 73 74 static void cw1200_sdio_lock(struct hwbus_priv *self) 75 { 76 sdio_claim_host(self->func); 77 } 78 79 static void cw1200_sdio_unlock(struct hwbus_priv *self) 80 { 81 sdio_release_host(self->func); 82 } 83 84 static void cw1200_sdio_irq_handler(struct sdio_func *func) 85 { 86 struct hwbus_priv *self = sdio_get_drvdata(func); 87 88 /* note: sdio_host already claimed here. */ 89 if (self->core) 90 cw1200_irq_handler(self->core); 91 } 92 93 static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id) 94 { 95 return IRQ_WAKE_THREAD; 96 } 97 98 static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id) 99 { 100 struct hwbus_priv *self = dev_id; 101 102 if (self->core) { 103 cw1200_sdio_lock(self); 104 cw1200_irq_handler(self->core); 105 cw1200_sdio_unlock(self); 106 return IRQ_HANDLED; 107 } else { 108 return IRQ_NONE; 109 } 110 } 111 112 static int cw1200_request_irq(struct hwbus_priv *self) 113 { 114 int ret; 115 u8 cccr; 116 117 cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret); 118 if (WARN_ON(ret)) 119 goto err; 120 121 /* Master interrupt enable ... */ 122 cccr |= BIT(0); 123 124 /* ... for our function */ 125 cccr |= BIT(self->func->num); 126 127 sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret); 128 if (WARN_ON(ret)) 129 goto err; 130 131 ret = enable_irq_wake(self->pdata->irq); 132 if (WARN_ON(ret)) 133 goto err; 134 135 /* Request the IRQ */ 136 ret = request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq, 137 cw1200_gpio_irq, 138 IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 139 "cw1200_wlan_irq", self); 140 if (WARN_ON(ret)) 141 goto err; 142 143 return 0; 144 145 err: 146 return ret; 147 } 148 149 static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self) 150 { 151 int ret = 0; 152 153 pr_debug("SW IRQ subscribe\n"); 154 sdio_claim_host(self->func); 155 if (self->pdata->irq) 156 ret = cw1200_request_irq(self); 157 else 158 ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler); 159 160 sdio_release_host(self->func); 161 return ret; 162 } 163 164 static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self) 165 { 166 int ret = 0; 167 168 pr_debug("SW IRQ unsubscribe\n"); 169 170 if (self->pdata->irq) { 171 disable_irq_wake(self->pdata->irq); 172 free_irq(self->pdata->irq, self); 173 } else { 174 sdio_claim_host(self->func); 175 ret = sdio_release_irq(self->func); 176 sdio_release_host(self->func); 177 } 178 return ret; 179 } 180 181 /* Like the rest of the driver, this only supports one device per system */ 182 static struct gpio_desc *cw1200_reset; 183 static struct gpio_desc *cw1200_powerup; 184 185 static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata) 186 { 187 if (cw1200_reset) { 188 gpiod_set_value(cw1200_reset, 0); 189 msleep(30); /* Min is 2 * CLK32K cycles */ 190 } 191 192 if (pdata->power_ctrl) 193 pdata->power_ctrl(pdata, false); 194 if (pdata->clk_ctrl) 195 pdata->clk_ctrl(pdata, false); 196 197 return 0; 198 } 199 200 static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata) 201 { 202 /* Ensure I/Os are pulled low (reset is active low) */ 203 cw1200_reset = devm_gpiod_get_optional(NULL, "reset", GPIOD_OUT_HIGH); 204 if (IS_ERR(cw1200_reset)) { 205 pr_err("could not get CW1200 SDIO reset GPIO\n"); 206 return PTR_ERR(cw1200_reset); 207 } 208 gpiod_set_consumer_name(cw1200_reset, "cw1200_wlan_reset"); 209 cw1200_powerup = devm_gpiod_get_optional(NULL, "powerup", GPIOD_OUT_LOW); 210 if (IS_ERR(cw1200_powerup)) { 211 pr_err("could not get CW1200 SDIO powerup GPIO\n"); 212 return PTR_ERR(cw1200_powerup); 213 } 214 gpiod_set_consumer_name(cw1200_powerup, "cw1200_wlan_powerup"); 215 216 if (cw1200_reset || cw1200_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 (cw1200_powerup) { 238 gpiod_set_value(cw1200_powerup, 1); 239 msleep(250); /* or more..? */ 240 } 241 /* Deassert RSTn signal, note active low */ 242 if (cw1200_reset) { 243 gpiod_set_value(cw1200_reset, 0); 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 const 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