Linus Walleij | bd41b99 | 2009-04-23 21:15:04 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * arch/arm/mach-u300/gpio.c |
| 4 | * |
| 5 | * |
| 6 | * Copyright (C) 2007-2009 ST-Ericsson AB |
| 7 | * License terms: GNU General Public License (GPL) version 2 |
| 8 | * U300 GPIO module. |
| 9 | * This can driver either of the two basic GPIO cores |
| 10 | * available in the U300 platforms: |
| 11 | * COH 901 335 - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0) |
| 12 | * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0) |
| 13 | * Notice that you also have inline macros in <asm-arch/gpio.h> |
| 14 | * Author: Linus Walleij <linus.walleij@stericsson.com> |
| 15 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> |
| 16 | * |
| 17 | */ |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/io.h> |
| 23 | #include <linux/clk.h> |
| 24 | #include <linux/err.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/gpio.h> |
| 27 | |
| 28 | /* Need access to SYSCON registers for PADmuxing */ |
| 29 | #include <mach/syscon.h> |
| 30 | |
| 31 | #include "padmux.h" |
| 32 | |
| 33 | /* Reference to GPIO block clock */ |
| 34 | static struct clk *clk; |
| 35 | |
| 36 | /* Memory resource */ |
| 37 | static struct resource *memres; |
| 38 | static void __iomem *virtbase; |
| 39 | |
| 40 | struct u300_gpio_port { |
| 41 | const char *name; |
| 42 | int irq; |
| 43 | int number; |
| 44 | }; |
| 45 | |
| 46 | |
| 47 | static struct u300_gpio_port gpio_ports[] = { |
| 48 | { |
| 49 | .name = "gpio0", |
| 50 | .number = 0, |
| 51 | }, |
| 52 | { |
| 53 | .name = "gpio1", |
| 54 | .number = 1, |
| 55 | }, |
| 56 | { |
| 57 | .name = "gpio2", |
| 58 | .number = 2, |
| 59 | }, |
| 60 | #ifdef U300_COH901571_3 |
| 61 | { |
| 62 | .name = "gpio3", |
| 63 | .number = 3, |
| 64 | }, |
| 65 | { |
| 66 | .name = "gpio4", |
| 67 | .number = 4, |
| 68 | }, |
| 69 | #ifdef CONFIG_MACH_U300_BS335 |
| 70 | { |
| 71 | .name = "gpio5", |
| 72 | .number = 5, |
| 73 | }, |
| 74 | { |
| 75 | .name = "gpio6", |
| 76 | .number = 6, |
| 77 | }, |
| 78 | #endif |
| 79 | #endif |
| 80 | |
| 81 | }; |
| 82 | |
| 83 | |
| 84 | #ifdef U300_COH901571_3 |
| 85 | |
| 86 | /* Default input value */ |
| 87 | #define DEFAULT_OUTPUT_LOW 0 |
| 88 | #define DEFAULT_OUTPUT_HIGH 1 |
| 89 | |
| 90 | /* GPIO Pull-Up status */ |
| 91 | #define DISABLE_PULL_UP 0 |
| 92 | #define ENABLE_PULL_UP 1 |
| 93 | |
| 94 | #define GPIO_NOT_USED 0 |
| 95 | #define GPIO_IN 1 |
| 96 | #define GPIO_OUT 2 |
| 97 | |
| 98 | struct u300_gpio_configuration_data { |
| 99 | unsigned char pin_usage; |
| 100 | unsigned char default_output_value; |
| 101 | unsigned char pull_up; |
| 102 | }; |
| 103 | |
| 104 | /* Initial configuration */ |
| 105 | const struct u300_gpio_configuration_data |
| 106 | u300_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = { |
| 107 | #ifdef CONFIG_MACH_U300_BS335 |
| 108 | /* Port 0, pins 0-7 */ |
| 109 | { |
| 110 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 111 | {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP}, |
| 112 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 113 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 114 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 115 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 116 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 117 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 118 | }, |
| 119 | /* Port 1, pins 0-7 */ |
| 120 | { |
| 121 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 122 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 123 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 124 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 125 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 126 | {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP}, |
| 127 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 128 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 129 | }, |
| 130 | /* Port 2, pins 0-7 */ |
| 131 | { |
| 132 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 133 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 134 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 135 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 136 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 137 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 138 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 139 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} |
| 140 | }, |
| 141 | /* Port 3, pins 0-7 */ |
| 142 | { |
| 143 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 144 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 145 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 146 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 147 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 148 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 149 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 150 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 151 | }, |
| 152 | /* Port 4, pins 0-7 */ |
| 153 | { |
| 154 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 155 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 156 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 157 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 158 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 159 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 160 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 161 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 162 | }, |
| 163 | /* Port 5, pins 0-7 */ |
| 164 | { |
| 165 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 166 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 167 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 168 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 169 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 170 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 171 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 172 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 173 | }, |
| 174 | /* Port 6, pind 0-7 */ |
| 175 | { |
| 176 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 177 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 178 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 179 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 180 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 181 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 182 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 183 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 184 | } |
| 185 | #endif |
| 186 | |
| 187 | #ifdef CONFIG_MACH_U300_BS365 |
| 188 | /* Port 0, pins 0-7 */ |
| 189 | { |
| 190 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 191 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 192 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 193 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 194 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 195 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 196 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 197 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 198 | }, |
| 199 | /* Port 1, pins 0-7 */ |
| 200 | { |
| 201 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 202 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 203 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 204 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 205 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 206 | {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP}, |
| 207 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 208 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} |
| 209 | }, |
| 210 | /* Port 2, pins 0-7 */ |
| 211 | { |
| 212 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 213 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 214 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 215 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, |
| 216 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 217 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 218 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 219 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} |
| 220 | }, |
| 221 | /* Port 3, pins 0-7 */ |
| 222 | { |
| 223 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 224 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 225 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 226 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 227 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 228 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 229 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 230 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} |
| 231 | }, |
| 232 | /* Port 4, pins 0-7 */ |
| 233 | { |
| 234 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 235 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 236 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 237 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 238 | /* These 4 pins doesn't exist on DB3210 */ |
| 239 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 240 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 241 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, |
| 242 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} |
| 243 | } |
| 244 | #endif |
| 245 | }; |
| 246 | #endif |
| 247 | |
| 248 | |
| 249 | /* No users == we can power down GPIO */ |
| 250 | static int gpio_users; |
| 251 | |
| 252 | struct gpio_struct { |
| 253 | int (*callback)(void *); |
| 254 | void *data; |
| 255 | int users; |
| 256 | }; |
| 257 | |
| 258 | static struct gpio_struct gpio_pin[U300_GPIO_MAX]; |
| 259 | |
| 260 | /* |
| 261 | * Let drivers register callback in order to get notified when there is |
| 262 | * an interrupt on the gpio pin |
| 263 | */ |
| 264 | int gpio_register_callback(unsigned gpio, int (*func)(void *arg), void *data) |
| 265 | { |
| 266 | if (gpio_pin[gpio].callback) |
| 267 | printk(KERN_WARNING "GPIO: %s: WARNING: callback already " \ |
| 268 | "registered for gpio pin#%d\n", __func__, gpio); |
| 269 | gpio_pin[gpio].callback = func; |
| 270 | gpio_pin[gpio].data = data; |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | EXPORT_SYMBOL(gpio_register_callback); |
| 275 | |
| 276 | int gpio_unregister_callback(unsigned gpio) |
| 277 | { |
| 278 | if (!gpio_pin[gpio].callback) |
| 279 | printk(KERN_WARNING "GPIO: %s: WARNING: callback already " \ |
| 280 | "unregistered for gpio pin#%d\n", __func__, gpio); |
| 281 | gpio_pin[gpio].callback = NULL; |
| 282 | gpio_pin[gpio].data = NULL; |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | EXPORT_SYMBOL(gpio_unregister_callback); |
| 287 | |
| 288 | int gpio_request(unsigned gpio, const char *label) |
| 289 | { |
| 290 | if (gpio_pin[gpio].users) |
| 291 | return -EINVAL; |
| 292 | else |
| 293 | gpio_pin[gpio].users++; |
| 294 | |
| 295 | gpio_users++; |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | EXPORT_SYMBOL(gpio_request); |
| 300 | |
| 301 | void gpio_free(unsigned gpio) |
| 302 | { |
| 303 | gpio_users--; |
| 304 | gpio_pin[gpio].users--; |
| 305 | if (unlikely(gpio_pin[gpio].users < 0)) { |
| 306 | printk(KERN_WARNING "GPIO: Warning: gpio#%d release mismatch\n", |
| 307 | gpio); |
| 308 | gpio_pin[gpio].users = 0; |
| 309 | } |
| 310 | |
| 311 | return; |
| 312 | } |
| 313 | EXPORT_SYMBOL(gpio_free); |
| 314 | |
| 315 | /* This returns zero or nonzero */ |
| 316 | int gpio_get_value(unsigned gpio) |
| 317 | { |
| 318 | return readl(virtbase + U300_GPIO_PXPDIR + |
| 319 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) & (1 << (gpio & 0x07)); |
| 320 | } |
| 321 | EXPORT_SYMBOL(gpio_get_value); |
| 322 | |
| 323 | /* |
| 324 | * We hope that the compiler will optimize away the unused branch |
| 325 | * in case "value" is a constant |
| 326 | */ |
| 327 | void gpio_set_value(unsigned gpio, int value) |
| 328 | { |
| 329 | u32 val; |
| 330 | unsigned long flags; |
| 331 | |
| 332 | local_irq_save(flags); |
| 333 | if (value) { |
| 334 | /* set */ |
| 335 | val = readl(virtbase + U300_GPIO_PXPDOR + |
| 336 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) |
| 337 | & (1 << (gpio & 0x07)); |
| 338 | writel(val | (1 << (gpio & 0x07)), virtbase + |
| 339 | U300_GPIO_PXPDOR + |
| 340 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); |
| 341 | } else { |
| 342 | /* clear */ |
| 343 | val = readl(virtbase + U300_GPIO_PXPDOR + |
| 344 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) |
| 345 | & (1 << (gpio & 0x07)); |
| 346 | writel(val & ~(1 << (gpio & 0x07)), virtbase + |
| 347 | U300_GPIO_PXPDOR + |
| 348 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); |
| 349 | } |
| 350 | local_irq_restore(flags); |
| 351 | } |
| 352 | EXPORT_SYMBOL(gpio_set_value); |
| 353 | |
| 354 | int gpio_direction_input(unsigned gpio) |
| 355 | { |
| 356 | unsigned long flags; |
| 357 | u32 val; |
| 358 | |
| 359 | if (gpio > U300_GPIO_MAX) |
| 360 | return -EINVAL; |
| 361 | |
| 362 | local_irq_save(flags); |
| 363 | val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * |
| 364 | U300_GPIO_PORTX_SPACING); |
| 365 | /* Mask out this pin*/ |
| 366 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1)); |
| 367 | /* This is not needed since it sets the bits to zero.*/ |
| 368 | /* val |= (U300_GPIO_PXPCR_PIN_MODE_INPUT << (gpio*2)); */ |
| 369 | writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * |
| 370 | U300_GPIO_PORTX_SPACING); |
| 371 | local_irq_restore(flags); |
| 372 | return 0; |
| 373 | } |
| 374 | EXPORT_SYMBOL(gpio_direction_input); |
| 375 | |
| 376 | int gpio_direction_output(unsigned gpio, int value) |
| 377 | { |
| 378 | unsigned long flags; |
| 379 | u32 val; |
| 380 | |
| 381 | if (gpio > U300_GPIO_MAX) |
| 382 | return -EINVAL; |
| 383 | |
| 384 | local_irq_save(flags); |
| 385 | val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * |
| 386 | U300_GPIO_PORTX_SPACING); |
| 387 | /* Mask out this pin */ |
| 388 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1)); |
| 389 | /* |
| 390 | * FIXME: configure for push/pull, open drain or open source per pin |
| 391 | * in setup. The current driver will only support push/pull. |
| 392 | */ |
| 393 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL |
| 394 | << ((gpio & 0x07) << 1)); |
| 395 | writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * |
| 396 | U300_GPIO_PORTX_SPACING); |
| 397 | gpio_set_value(gpio, value); |
| 398 | local_irq_restore(flags); |
| 399 | return 0; |
| 400 | } |
| 401 | EXPORT_SYMBOL(gpio_direction_output); |
| 402 | |
| 403 | /* |
| 404 | * Enable an IRQ, edge is rising edge (!= 0) or falling edge (==0). |
| 405 | */ |
| 406 | void enable_irq_on_gpio_pin(unsigned gpio, int edge) |
| 407 | { |
| 408 | u32 val; |
| 409 | unsigned long flags; |
| 410 | local_irq_save(flags); |
| 411 | |
| 412 | val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * |
| 413 | U300_GPIO_PORTX_SPACING); |
| 414 | val |= (1 << (gpio & 0x07)); |
| 415 | writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * |
| 416 | U300_GPIO_PORTX_SPACING); |
| 417 | val = readl(virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) * |
| 418 | U300_GPIO_PORTX_SPACING); |
| 419 | if (edge) |
| 420 | val |= (1 << (gpio & 0x07)); |
| 421 | else |
| 422 | val &= ~(1 << (gpio & 0x07)); |
| 423 | writel(val, virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) * |
| 424 | U300_GPIO_PORTX_SPACING); |
| 425 | local_irq_restore(flags); |
| 426 | } |
| 427 | EXPORT_SYMBOL(enable_irq_on_gpio_pin); |
| 428 | |
| 429 | void disable_irq_on_gpio_pin(unsigned gpio) |
| 430 | { |
| 431 | u32 val; |
| 432 | unsigned long flags; |
| 433 | |
| 434 | local_irq_save(flags); |
| 435 | val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * |
| 436 | U300_GPIO_PORTX_SPACING); |
| 437 | val &= ~(1 << (gpio & 0x07)); |
| 438 | writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * |
| 439 | U300_GPIO_PORTX_SPACING); |
| 440 | local_irq_restore(flags); |
| 441 | } |
| 442 | EXPORT_SYMBOL(disable_irq_on_gpio_pin); |
| 443 | |
| 444 | /* Enable (value == 0) or disable (value == 1) internal pullup */ |
| 445 | void gpio_pullup(unsigned gpio, int value) |
| 446 | { |
| 447 | u32 val; |
| 448 | unsigned long flags; |
| 449 | |
| 450 | local_irq_save(flags); |
| 451 | if (value) { |
| 452 | val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) * |
| 453 | U300_GPIO_PORTX_SPACING); |
| 454 | writel(val | (1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER + |
| 455 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); |
| 456 | } else { |
| 457 | val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) * |
| 458 | U300_GPIO_PORTX_SPACING); |
| 459 | writel(val & ~(1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER + |
| 460 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); |
| 461 | } |
| 462 | local_irq_restore(flags); |
| 463 | } |
| 464 | EXPORT_SYMBOL(gpio_pullup); |
| 465 | |
| 466 | static irqreturn_t gpio_irq_handler(int irq, void *dev_id) |
| 467 | { |
| 468 | struct u300_gpio_port *port = dev_id; |
| 469 | u32 val; |
| 470 | int pin; |
| 471 | |
| 472 | /* Read event register */ |
| 473 | val = readl(virtbase + U300_GPIO_PXIEV + port->number * |
| 474 | U300_GPIO_PORTX_SPACING); |
| 475 | /* Mask with enable register */ |
| 476 | val &= readl(virtbase + U300_GPIO_PXIEV + port->number * |
| 477 | U300_GPIO_PORTX_SPACING); |
| 478 | /* Mask relevant bits */ |
| 479 | val &= U300_GPIO_PXIEV_ALL_IRQ_EVENT_MASK; |
| 480 | /* ACK IRQ (clear event) */ |
| 481 | writel(val, virtbase + U300_GPIO_PXIEV + port->number * |
| 482 | U300_GPIO_PORTX_SPACING); |
| 483 | /* Print message */ |
| 484 | while (val != 0) { |
| 485 | unsigned gpio; |
| 486 | |
| 487 | pin = __ffs(val); |
| 488 | /* mask off this pin */ |
| 489 | val &= ~(1 << pin); |
| 490 | gpio = (port->number << 3) + pin; |
| 491 | |
| 492 | if (gpio_pin[gpio].callback) |
| 493 | (void)gpio_pin[gpio].callback(gpio_pin[gpio].data); |
| 494 | else |
| 495 | printk(KERN_DEBUG "GPIO: Stray GPIO IRQ on line %d\n", |
| 496 | gpio); |
| 497 | } |
| 498 | return IRQ_HANDLED; |
| 499 | } |
| 500 | |
| 501 | static void gpio_set_initial_values(void) |
| 502 | { |
| 503 | #ifdef U300_COH901571_3 |
| 504 | int i, j; |
| 505 | unsigned long flags; |
| 506 | u32 val; |
| 507 | |
| 508 | /* Write default values to all pins */ |
| 509 | for (i = 0; i < U300_GPIO_NUM_PORTS; i++) { |
| 510 | val = 0; |
| 511 | for (j = 0; j < 8; j++) |
| 512 | val |= (u32) (u300_gpio_config[i][j].default_output_value != DEFAULT_OUTPUT_LOW) << j; |
| 513 | local_irq_save(flags); |
| 514 | writel(val, virtbase + U300_GPIO_PXPDOR + i * U300_GPIO_PORTX_SPACING); |
| 515 | local_irq_restore(flags); |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Put all pins that are set to either 'GPIO_OUT' or 'GPIO_NOT_USED' |
| 520 | * to output and 'GPIO_IN' to input for each port. And initalize |
| 521 | * default value on outputs. |
| 522 | */ |
| 523 | for (i = 0; i < U300_GPIO_NUM_PORTS; i++) { |
| 524 | for (j = 0; j < U300_GPIO_PINS_PER_PORT; j++) { |
| 525 | local_irq_save(flags); |
| 526 | val = readl(virtbase + U300_GPIO_PXPCR + |
| 527 | i * U300_GPIO_PORTX_SPACING); |
| 528 | /* Mask out this pin */ |
| 529 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << (j << 1)); |
| 530 | |
| 531 | if (u300_gpio_config[i][j].pin_usage != GPIO_IN) |
| 532 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << (j << 1)); |
| 533 | writel(val, virtbase + U300_GPIO_PXPCR + |
| 534 | i * U300_GPIO_PORTX_SPACING); |
| 535 | local_irq_restore(flags); |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | /* Enable or disable the internal pull-ups in the GPIO ASIC block */ |
| 540 | for (i = 0; i < U300_GPIO_MAX; i++) { |
| 541 | val = 0; |
| 542 | for (j = 0; j < 8; j++) |
| 543 | val |= (u32)((u300_gpio_config[i][j].pull_up == DISABLE_PULL_UP)) << j; |
| 544 | local_irq_save(flags); |
| 545 | writel(val, virtbase + U300_GPIO_PXPER + i * U300_GPIO_PORTX_SPACING); |
| 546 | local_irq_restore(flags); |
| 547 | } |
| 548 | #endif |
| 549 | } |
| 550 | |
| 551 | static int __devinit gpio_probe(struct platform_device *pdev) |
| 552 | { |
| 553 | u32 val; |
| 554 | int err = 0; |
| 555 | int i; |
| 556 | int num_irqs; |
| 557 | |
| 558 | memset(gpio_pin, 0, sizeof(gpio_pin)); |
| 559 | |
| 560 | /* Get GPIO clock */ |
| 561 | clk = clk_get(&pdev->dev, NULL); |
| 562 | if (IS_ERR(clk)) { |
| 563 | err = PTR_ERR(clk); |
| 564 | printk(KERN_ERR "GPIO: could not get GPIO clock\n"); |
| 565 | goto err_no_clk; |
| 566 | } |
| 567 | err = clk_enable(clk); |
| 568 | if (err) { |
| 569 | printk(KERN_ERR "GPIO: could not enable GPIO clock\n"); |
| 570 | goto err_no_clk_enable; |
| 571 | } |
| 572 | |
| 573 | memres = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 574 | if (!memres) |
| 575 | goto err_no_resource; |
| 576 | |
| 577 | if (request_mem_region(memres->start, memres->end - memres->start, "GPIO Controller") |
| 578 | == NULL) { |
| 579 | err = -ENODEV; |
| 580 | goto err_no_ioregion; |
| 581 | } |
| 582 | |
| 583 | virtbase = ioremap(memres->start, memres->end - memres->start + 1); |
| 584 | if (!virtbase) { |
| 585 | err = -ENOMEM; |
| 586 | goto err_no_ioremap; |
| 587 | } |
| 588 | |
| 589 | #ifdef U300_COH901335 |
| 590 | printk(KERN_INFO "GPIO: Initializing GPIO Controller COH 901 335\n"); |
| 591 | /* Turn on the GPIO block */ |
| 592 | writel(U300_GPIO_CR_BLOCK_CLOCK_ENABLE, virtbase + U300_GPIO_CR); |
| 593 | #endif |
| 594 | |
| 595 | #ifdef U300_COH901571_3 |
| 596 | printk(KERN_INFO "GPIO: Initializing GPIO Controller COH 901 571/3\n"); |
| 597 | val = readl(virtbase + U300_GPIO_CR); |
| 598 | printk(KERN_INFO "GPIO: COH901571/3 block version: %d, " \ |
| 599 | "number of cores: %d\n", |
| 600 | ((val & 0x0000FE00) >> 9), |
| 601 | ((val & 0x000001FC) >> 2)); |
| 602 | writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR); |
| 603 | #endif |
| 604 | |
| 605 | /* Set up some padmuxing here */ |
| 606 | #ifdef CONFIG_MMC |
| 607 | pmx_set_mission_mode_mmc(); |
| 608 | #endif |
| 609 | #ifdef CONFIG_SPI_PL022 |
| 610 | pmx_set_mission_mode_spi(); |
| 611 | #endif |
| 612 | |
| 613 | gpio_set_initial_values(); |
| 614 | |
| 615 | for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) { |
| 616 | |
| 617 | gpio_ports[num_irqs].irq = |
| 618 | platform_get_irq_byname(pdev, |
| 619 | gpio_ports[num_irqs].name); |
| 620 | |
| 621 | err = request_irq(gpio_ports[num_irqs].irq, |
| 622 | gpio_irq_handler, IRQF_DISABLED, |
| 623 | gpio_ports[num_irqs].name, |
| 624 | &gpio_ports[num_irqs]); |
| 625 | if (err) { |
| 626 | printk(KERN_CRIT "GPIO: Cannot allocate IRQ for %s!\n", |
| 627 | gpio_ports[num_irqs].name); |
| 628 | goto err_no_irq; |
| 629 | } |
| 630 | /* Turns off PortX_irq_force */ |
| 631 | writel(0x0, virtbase + U300_GPIO_PXIFR + |
| 632 | num_irqs * U300_GPIO_PORTX_SPACING); |
| 633 | } |
| 634 | printk(KERN_INFO "GPIO: U300 gpio module loaded\n"); |
| 635 | |
| 636 | return 0; |
| 637 | |
| 638 | err_no_irq: |
| 639 | for (i = 0; i < num_irqs; i++) |
| 640 | free_irq(gpio_ports[i].irq, &gpio_ports[i]); |
| 641 | iounmap(virtbase); |
| 642 | err_no_ioremap: |
| 643 | release_mem_region(memres->start, memres->end - memres->start); |
| 644 | err_no_ioregion: |
| 645 | err_no_resource: |
| 646 | clk_disable(clk); |
| 647 | err_no_clk_enable: |
| 648 | clk_put(clk); |
| 649 | err_no_clk: |
| 650 | printk(KERN_INFO "GPIO: module ERROR:%d\n", err); |
| 651 | return err; |
| 652 | } |
| 653 | |
| 654 | static int __devexit gpio_remove(struct platform_device *pdev) |
| 655 | { |
| 656 | int i; |
| 657 | |
| 658 | /* Turn off the GPIO block */ |
| 659 | writel(0x00000000U, virtbase + U300_GPIO_CR); |
| 660 | for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++) |
| 661 | free_irq(gpio_ports[i].irq, &gpio_ports[i]); |
| 662 | iounmap(virtbase); |
| 663 | release_mem_region(memres->start, memres->end - memres->start); |
| 664 | clk_disable(clk); |
| 665 | clk_put(clk); |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | static struct platform_driver gpio_driver = { |
| 670 | .driver = { |
| 671 | .name = "u300-gpio", |
| 672 | }, |
| 673 | .probe = gpio_probe, |
| 674 | .remove = __devexit_p(gpio_remove), |
| 675 | }; |
| 676 | |
| 677 | |
| 678 | static int __init u300_gpio_init(void) |
| 679 | { |
| 680 | return platform_driver_register(&gpio_driver); |
| 681 | } |
| 682 | |
| 683 | static void __exit u300_gpio_exit(void) |
| 684 | { |
| 685 | platform_driver_unregister(&gpio_driver); |
| 686 | } |
| 687 | |
| 688 | arch_initcall(u300_gpio_init); |
| 689 | module_exit(u300_gpio_exit); |
| 690 | |
| 691 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); |
| 692 | |
| 693 | #ifdef U300_COH901571_3 |
| 694 | MODULE_DESCRIPTION("ST-Ericsson AB COH 901 571/3 GPIO driver"); |
| 695 | #endif |
| 696 | |
| 697 | #ifdef U300_COH901335 |
| 698 | MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335 GPIO driver"); |
| 699 | #endif |
| 700 | |
| 701 | MODULE_LICENSE("GPL"); |