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.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 static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata) 182 { 183 if (pdata->reset) { 184 gpio_set_value(pdata->reset, 0); 185 msleep(30); /* Min is 2 * CLK32K cycles */ 186 gpio_free(pdata->reset); 187 } 188 189 if (pdata->power_ctrl) 190 pdata->power_ctrl(pdata, false); 191 if (pdata->clk_ctrl) 192 pdata->clk_ctrl(pdata, false); 193 194 return 0; 195 } 196 197 static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata) 198 { 199 /* Ensure I/Os are pulled low */ 200 if (pdata->reset) { 201 gpio_request(pdata->reset, "cw1200_wlan_reset"); 202 gpio_direction_output(pdata->reset, 0); 203 } 204 if (pdata->powerup) { 205 gpio_request(pdata->powerup, "cw1200_wlan_powerup"); 206 gpio_direction_output(pdata->powerup, 0); 207 } 208 if (pdata->reset || pdata->powerup) 209 msleep(10); /* 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 (pdata->powerup) { 230 gpio_set_value(pdata->powerup, 1); 231 msleep(250); /* or more..? */ 232 } 233 /* Enable RSTn signal */ 234 if (pdata->reset) { 235 gpio_set_value(pdata->reset, 1); 236 msleep(50); /* Or more..? */ 237 } 238 return 0; 239 } 240 241 static size_t cw1200_sdio_align_size(struct hwbus_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 hwbus_priv *self, bool suspend) 252 { 253 int ret = 0; 254 255 if (self->pdata->irq) 256 ret = irq_set_irq_wake(self->pdata->irq, suspend); 257 return ret; 258 } 259 260 static const struct hwbus_ops cw1200_sdio_hwbus_ops = { 261 .hwbus_memcpy_fromio = cw1200_sdio_memcpy_fromio, 262 .hwbus_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 hwbus_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 hwbus_priv.\n"); 285 return -ENOMEM; 286 } 287 288 func->card->quirks |= MMC_QUIRK_LENIENT_FN0; 289 290 self->pdata = global_plat_data; /* FIXME */ 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_hwbus_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 */ 320 static void cw1200_sdio_disconnect(struct sdio_func *func) 321 { 322 struct hwbus_priv *self = sdio_get_drvdata(func); 323 324 if (self) { 325 cw1200_sdio_irq_unsubscribe(self); 326 if (self->core) { 327 cw1200_core_release(self->core); 328 self->core = NULL; 329 } 330 sdio_claim_host(func); 331 sdio_disable_func(func); 332 sdio_release_host(func); 333 sdio_set_drvdata(func, NULL); 334 kfree(self); 335 } 336 } 337 338 #ifdef CONFIG_PM 339 static int cw1200_sdio_suspend(struct device *dev) 340 { 341 int ret; 342 struct sdio_func *func = dev_to_sdio_func(dev); 343 struct hwbus_priv *self = sdio_get_drvdata(func); 344 345 if (!cw1200_can_suspend(self->core)) 346 return -EAGAIN; 347 348 /* Notify SDIO that CW1200 will remain powered during suspend */ 349 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); 350 if (ret) 351 pr_err("Error setting SDIO pm flags: %i\n", ret); 352 353 return ret; 354 } 355 356 static int cw1200_sdio_resume(struct device *dev) 357 { 358 return 0; 359 } 360 361 static const struct dev_pm_ops cw1200_pm_ops = { 362 .suspend = cw1200_sdio_suspend, 363 .resume = cw1200_sdio_resume, 364 }; 365 #endif 366 367 static struct sdio_driver sdio_driver = { 368 .name = "cw1200_wlan_sdio", 369 .id_table = cw1200_sdio_ids, 370 .probe = cw1200_sdio_probe, 371 .remove = cw1200_sdio_disconnect, 372 #ifdef CONFIG_PM 373 .drv = { 374 .pm = &cw1200_pm_ops, 375 } 376 #endif 377 }; 378 379 /* Init Module function -> Called by insmod */ 380 static int __init cw1200_sdio_init(void) 381 { 382 const struct cw1200_platform_data_sdio *pdata; 383 int ret; 384 385 /* FIXME -- this won't support multiple devices */ 386 pdata = global_plat_data; 387 388 if (cw1200_sdio_on(pdata)) { 389 ret = -1; 390 goto err; 391 } 392 393 ret = sdio_register_driver(&sdio_driver); 394 if (ret) 395 goto err; 396 397 return 0; 398 399 err: 400 cw1200_sdio_off(pdata); 401 return ret; 402 } 403 404 /* Called at Driver Unloading */ 405 static void __exit cw1200_sdio_exit(void) 406 { 407 const struct cw1200_platform_data_sdio *pdata; 408 409 /* FIXME -- this won't support multiple devices */ 410 pdata = global_plat_data; 411 sdio_unregister_driver(&sdio_driver); 412 cw1200_sdio_off(pdata); 413 } 414 415 416 module_init(cw1200_sdio_init); 417 module_exit(cw1200_sdio_exit); 418