Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO) |
| 3 | * |
| 4 | * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren |
| 5 | * |
| 6 | * This driver is inspired by: |
| 7 | * pinctrl-nomadik.c, please see original file for copyright information |
| 8 | * pinctrl-tegra.c, please see original file for copyright information |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/bitmap.h> |
| 22 | #include <linux/bug.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/err.h> |
| 26 | #include <linux/gpio.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/io.h> |
| 29 | #include <linux/irq.h> |
| 30 | #include <linux/irqdesc.h> |
| 31 | #include <linux/irqdomain.h> |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 32 | #include <linux/module.h> |
| 33 | #include <linux/of_address.h> |
| 34 | #include <linux/of.h> |
| 35 | #include <linux/of_irq.h> |
| 36 | #include <linux/pinctrl/consumer.h> |
| 37 | #include <linux/pinctrl/machine.h> |
| 38 | #include <linux/pinctrl/pinconf.h> |
| 39 | #include <linux/pinctrl/pinctrl.h> |
| 40 | #include <linux/pinctrl/pinmux.h> |
| 41 | #include <linux/platform_device.h> |
| 42 | #include <linux/seq_file.h> |
| 43 | #include <linux/slab.h> |
| 44 | #include <linux/spinlock.h> |
| 45 | #include <linux/types.h> |
| 46 | |
| 47 | #define MODULE_NAME "pinctrl-bcm2835" |
| 48 | #define BCM2835_NUM_GPIOS 54 |
| 49 | #define BCM2835_NUM_BANKS 2 |
| 50 | |
| 51 | #define BCM2835_PIN_BITMAP_SZ \ |
| 52 | DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8) |
| 53 | |
| 54 | /* GPIO register offsets */ |
| 55 | #define GPFSEL0 0x0 /* Function Select */ |
| 56 | #define GPSET0 0x1c /* Pin Output Set */ |
| 57 | #define GPCLR0 0x28 /* Pin Output Clear */ |
| 58 | #define GPLEV0 0x34 /* Pin Level */ |
| 59 | #define GPEDS0 0x40 /* Pin Event Detect Status */ |
| 60 | #define GPREN0 0x4c /* Pin Rising Edge Detect Enable */ |
| 61 | #define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */ |
| 62 | #define GPHEN0 0x64 /* Pin High Detect Enable */ |
| 63 | #define GPLEN0 0x70 /* Pin Low Detect Enable */ |
| 64 | #define GPAREN0 0x7c /* Pin Async Rising Edge Detect */ |
| 65 | #define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */ |
| 66 | #define GPPUD 0x94 /* Pin Pull-up/down Enable */ |
| 67 | #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */ |
| 68 | |
| 69 | #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4)) |
| 70 | #define FSEL_SHIFT(p) (((p) % 10) * 3) |
| 71 | #define GPIO_REG_OFFSET(p) ((p) / 32) |
| 72 | #define GPIO_REG_SHIFT(p) ((p) % 32) |
| 73 | |
| 74 | enum bcm2835_pinconf_param { |
| 75 | /* argument: bcm2835_pinconf_pull */ |
| 76 | BCM2835_PINCONF_PARAM_PULL, |
| 77 | }; |
| 78 | |
| 79 | enum bcm2835_pinconf_pull { |
| 80 | BCM2835_PINCONFIG_PULL_NONE, |
| 81 | BCM2835_PINCONFIG_PULL_DOWN, |
| 82 | BCM2835_PINCONFIG_PULL_UP, |
| 83 | }; |
| 84 | |
| 85 | #define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_)) |
| 86 | #define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16) |
| 87 | #define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff) |
| 88 | |
| 89 | struct bcm2835_gpio_irqdata { |
| 90 | struct bcm2835_pinctrl *pc; |
| 91 | int bank; |
| 92 | }; |
| 93 | |
| 94 | struct bcm2835_pinctrl { |
| 95 | struct device *dev; |
| 96 | void __iomem *base; |
| 97 | int irq[BCM2835_NUM_BANKS]; |
| 98 | |
| 99 | /* note: locking assumes each bank will have its own unsigned long */ |
| 100 | unsigned long enabled_irq_map[BCM2835_NUM_BANKS]; |
| 101 | unsigned int irq_type[BCM2835_NUM_GPIOS]; |
| 102 | |
| 103 | struct pinctrl_dev *pctl_dev; |
| 104 | struct irq_domain *irq_domain; |
| 105 | struct gpio_chip gpio_chip; |
| 106 | struct pinctrl_gpio_range gpio_range; |
| 107 | |
| 108 | struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS]; |
| 109 | spinlock_t irq_lock[BCM2835_NUM_BANKS]; |
| 110 | }; |
| 111 | |
| 112 | static struct lock_class_key gpio_lock_class; |
| 113 | |
| 114 | /* pins are just named GPIO0..GPIO53 */ |
| 115 | #define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a) |
| 116 | struct pinctrl_pin_desc bcm2835_gpio_pins[] = { |
| 117 | BCM2835_GPIO_PIN(0), |
| 118 | BCM2835_GPIO_PIN(1), |
| 119 | BCM2835_GPIO_PIN(2), |
| 120 | BCM2835_GPIO_PIN(3), |
| 121 | BCM2835_GPIO_PIN(4), |
| 122 | BCM2835_GPIO_PIN(5), |
| 123 | BCM2835_GPIO_PIN(6), |
| 124 | BCM2835_GPIO_PIN(7), |
| 125 | BCM2835_GPIO_PIN(8), |
| 126 | BCM2835_GPIO_PIN(9), |
| 127 | BCM2835_GPIO_PIN(10), |
| 128 | BCM2835_GPIO_PIN(11), |
| 129 | BCM2835_GPIO_PIN(12), |
| 130 | BCM2835_GPIO_PIN(13), |
| 131 | BCM2835_GPIO_PIN(14), |
| 132 | BCM2835_GPIO_PIN(15), |
| 133 | BCM2835_GPIO_PIN(16), |
| 134 | BCM2835_GPIO_PIN(17), |
| 135 | BCM2835_GPIO_PIN(18), |
| 136 | BCM2835_GPIO_PIN(19), |
| 137 | BCM2835_GPIO_PIN(20), |
| 138 | BCM2835_GPIO_PIN(21), |
| 139 | BCM2835_GPIO_PIN(22), |
| 140 | BCM2835_GPIO_PIN(23), |
| 141 | BCM2835_GPIO_PIN(24), |
| 142 | BCM2835_GPIO_PIN(25), |
| 143 | BCM2835_GPIO_PIN(26), |
| 144 | BCM2835_GPIO_PIN(27), |
| 145 | BCM2835_GPIO_PIN(28), |
| 146 | BCM2835_GPIO_PIN(29), |
| 147 | BCM2835_GPIO_PIN(30), |
| 148 | BCM2835_GPIO_PIN(31), |
| 149 | BCM2835_GPIO_PIN(32), |
| 150 | BCM2835_GPIO_PIN(33), |
| 151 | BCM2835_GPIO_PIN(34), |
| 152 | BCM2835_GPIO_PIN(35), |
| 153 | BCM2835_GPIO_PIN(36), |
| 154 | BCM2835_GPIO_PIN(37), |
| 155 | BCM2835_GPIO_PIN(38), |
| 156 | BCM2835_GPIO_PIN(39), |
| 157 | BCM2835_GPIO_PIN(40), |
| 158 | BCM2835_GPIO_PIN(41), |
| 159 | BCM2835_GPIO_PIN(42), |
| 160 | BCM2835_GPIO_PIN(43), |
| 161 | BCM2835_GPIO_PIN(44), |
| 162 | BCM2835_GPIO_PIN(45), |
| 163 | BCM2835_GPIO_PIN(46), |
| 164 | BCM2835_GPIO_PIN(47), |
| 165 | BCM2835_GPIO_PIN(48), |
| 166 | BCM2835_GPIO_PIN(49), |
| 167 | BCM2835_GPIO_PIN(50), |
| 168 | BCM2835_GPIO_PIN(51), |
| 169 | BCM2835_GPIO_PIN(52), |
| 170 | BCM2835_GPIO_PIN(53), |
| 171 | }; |
| 172 | |
| 173 | /* one pin per group */ |
| 174 | static const char * const bcm2835_gpio_groups[] = { |
| 175 | "gpio0", |
| 176 | "gpio1", |
| 177 | "gpio2", |
| 178 | "gpio3", |
| 179 | "gpio4", |
| 180 | "gpio5", |
| 181 | "gpio6", |
| 182 | "gpio7", |
| 183 | "gpio8", |
| 184 | "gpio9", |
| 185 | "gpio10", |
| 186 | "gpio11", |
| 187 | "gpio12", |
| 188 | "gpio13", |
| 189 | "gpio14", |
| 190 | "gpio15", |
| 191 | "gpio16", |
| 192 | "gpio17", |
| 193 | "gpio18", |
| 194 | "gpio19", |
| 195 | "gpio20", |
| 196 | "gpio21", |
| 197 | "gpio22", |
| 198 | "gpio23", |
| 199 | "gpio24", |
| 200 | "gpio25", |
| 201 | "gpio26", |
| 202 | "gpio27", |
| 203 | "gpio28", |
| 204 | "gpio29", |
| 205 | "gpio30", |
| 206 | "gpio31", |
| 207 | "gpio32", |
| 208 | "gpio33", |
| 209 | "gpio34", |
| 210 | "gpio35", |
| 211 | "gpio36", |
| 212 | "gpio37", |
| 213 | "gpio38", |
| 214 | "gpio39", |
| 215 | "gpio40", |
| 216 | "gpio41", |
| 217 | "gpio42", |
| 218 | "gpio43", |
| 219 | "gpio44", |
| 220 | "gpio45", |
| 221 | "gpio46", |
| 222 | "gpio47", |
| 223 | "gpio48", |
| 224 | "gpio49", |
| 225 | "gpio50", |
| 226 | "gpio51", |
| 227 | "gpio52", |
| 228 | "gpio53", |
| 229 | }; |
| 230 | |
| 231 | enum bcm2835_fsel { |
| 232 | BCM2835_FSEL_GPIO_IN = 0, |
| 233 | BCM2835_FSEL_GPIO_OUT = 1, |
| 234 | BCM2835_FSEL_ALT0 = 4, |
| 235 | BCM2835_FSEL_ALT1 = 5, |
| 236 | BCM2835_FSEL_ALT2 = 6, |
| 237 | BCM2835_FSEL_ALT3 = 7, |
| 238 | BCM2835_FSEL_ALT4 = 3, |
| 239 | BCM2835_FSEL_ALT5 = 2, |
| 240 | BCM2835_FSEL_COUNT = 8, |
| 241 | BCM2835_FSEL_MASK = 0x7, |
| 242 | }; |
| 243 | |
| 244 | static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = { |
| 245 | [BCM2835_FSEL_GPIO_IN] = "gpio_in", |
| 246 | [BCM2835_FSEL_GPIO_OUT] = "gpio_out", |
| 247 | [BCM2835_FSEL_ALT0] = "alt0", |
| 248 | [BCM2835_FSEL_ALT1] = "alt1", |
| 249 | [BCM2835_FSEL_ALT2] = "alt2", |
| 250 | [BCM2835_FSEL_ALT3] = "alt3", |
| 251 | [BCM2835_FSEL_ALT4] = "alt4", |
| 252 | [BCM2835_FSEL_ALT5] = "alt5", |
| 253 | }; |
| 254 | |
| 255 | static const char * const irq_type_names[] = { |
| 256 | [IRQ_TYPE_NONE] = "none", |
| 257 | [IRQ_TYPE_EDGE_RISING] = "edge-rising", |
| 258 | [IRQ_TYPE_EDGE_FALLING] = "edge-falling", |
| 259 | [IRQ_TYPE_EDGE_BOTH] = "edge-both", |
| 260 | [IRQ_TYPE_LEVEL_HIGH] = "level-high", |
| 261 | [IRQ_TYPE_LEVEL_LOW] = "level-low", |
| 262 | }; |
| 263 | |
| 264 | static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg) |
| 265 | { |
| 266 | return readl(pc->base + reg); |
| 267 | } |
| 268 | |
| 269 | static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg, |
| 270 | u32 val) |
| 271 | { |
| 272 | writel(val, pc->base + reg); |
| 273 | } |
| 274 | |
| 275 | static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg, |
| 276 | unsigned bit) |
| 277 | { |
| 278 | reg += GPIO_REG_OFFSET(bit) * 4; |
| 279 | return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1; |
| 280 | } |
| 281 | |
| 282 | /* note NOT a read/modify/write cycle */ |
| 283 | static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc, |
| 284 | unsigned reg, unsigned bit) |
| 285 | { |
| 286 | reg += GPIO_REG_OFFSET(bit) * 4; |
| 287 | bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit))); |
| 288 | } |
| 289 | |
| 290 | static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get( |
| 291 | struct bcm2835_pinctrl *pc, unsigned pin) |
| 292 | { |
| 293 | u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin)); |
| 294 | enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK; |
| 295 | |
| 296 | dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin, |
| 297 | bcm2835_functions[status]); |
| 298 | |
| 299 | return status; |
| 300 | } |
| 301 | |
| 302 | static inline void bcm2835_pinctrl_fsel_set( |
| 303 | struct bcm2835_pinctrl *pc, unsigned pin, |
| 304 | enum bcm2835_fsel fsel) |
| 305 | { |
| 306 | u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin)); |
| 307 | enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK; |
| 308 | |
| 309 | dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin, |
| 310 | bcm2835_functions[cur]); |
| 311 | |
| 312 | if (cur == fsel) |
| 313 | return; |
| 314 | |
| 315 | if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) { |
| 316 | /* always transition through GPIO_IN */ |
| 317 | val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin)); |
| 318 | val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin); |
| 319 | |
| 320 | dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin, |
| 321 | bcm2835_functions[BCM2835_FSEL_GPIO_IN]); |
| 322 | bcm2835_gpio_wr(pc, FSEL_REG(pin), val); |
| 323 | } |
| 324 | |
| 325 | val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin)); |
| 326 | val |= fsel << FSEL_SHIFT(pin); |
| 327 | |
| 328 | dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin, |
| 329 | bcm2835_functions[fsel]); |
| 330 | bcm2835_gpio_wr(pc, FSEL_REG(pin), val); |
| 331 | } |
| 332 | |
| 333 | static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset) |
| 334 | { |
| 335 | return pinctrl_request_gpio(chip->base + offset); |
| 336 | } |
| 337 | |
| 338 | static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset) |
| 339 | { |
| 340 | pinctrl_free_gpio(chip->base + offset); |
| 341 | } |
| 342 | |
| 343 | static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 344 | { |
| 345 | return pinctrl_gpio_direction_input(chip->base + offset); |
| 346 | } |
| 347 | |
| 348 | static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 349 | { |
| 350 | struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev); |
| 351 | |
| 352 | return bcm2835_gpio_get_bit(pc, GPLEV0, offset); |
| 353 | } |
| 354 | |
| 355 | static int bcm2835_gpio_direction_output(struct gpio_chip *chip, |
| 356 | unsigned offset, int value) |
| 357 | { |
| 358 | return pinctrl_gpio_direction_output(chip->base + offset); |
| 359 | } |
| 360 | |
| 361 | static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 362 | { |
| 363 | struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev); |
| 364 | |
| 365 | bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset); |
| 366 | } |
| 367 | |
| 368 | static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| 369 | { |
| 370 | struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev); |
| 371 | |
| 372 | return irq_linear_revmap(pc->irq_domain, offset); |
| 373 | } |
| 374 | |
Bill Pemberton | 84db00b | 2012-11-19 13:25:13 -0500 | [diff] [blame] | 375 | static struct gpio_chip bcm2835_gpio_chip = { |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 376 | .label = MODULE_NAME, |
| 377 | .owner = THIS_MODULE, |
| 378 | .request = bcm2835_gpio_request, |
| 379 | .free = bcm2835_gpio_free, |
| 380 | .direction_input = bcm2835_gpio_direction_input, |
| 381 | .direction_output = bcm2835_gpio_direction_output, |
| 382 | .get = bcm2835_gpio_get, |
| 383 | .set = bcm2835_gpio_set, |
| 384 | .to_irq = bcm2835_gpio_to_irq, |
| 385 | .base = -1, |
| 386 | .ngpio = BCM2835_NUM_GPIOS, |
| 387 | .can_sleep = 0, |
| 388 | }; |
| 389 | |
| 390 | static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id) |
| 391 | { |
| 392 | struct bcm2835_gpio_irqdata *irqdata = dev_id; |
| 393 | struct bcm2835_pinctrl *pc = irqdata->pc; |
| 394 | int bank = irqdata->bank; |
| 395 | unsigned long events; |
| 396 | unsigned offset; |
| 397 | unsigned gpio; |
| 398 | unsigned int type; |
| 399 | |
| 400 | events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4); |
| 401 | events &= pc->enabled_irq_map[bank]; |
| 402 | for_each_set_bit(offset, &events, 32) { |
| 403 | gpio = (32 * bank) + offset; |
| 404 | type = pc->irq_type[gpio]; |
| 405 | |
| 406 | /* ack edge triggered IRQs immediately */ |
| 407 | if (!(type & IRQ_TYPE_LEVEL_MASK)) |
| 408 | bcm2835_gpio_set_bit(pc, GPEDS0, gpio); |
| 409 | |
| 410 | generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio)); |
| 411 | |
| 412 | /* ack level triggered IRQ after handling them */ |
| 413 | if (type & IRQ_TYPE_LEVEL_MASK) |
| 414 | bcm2835_gpio_set_bit(pc, GPEDS0, gpio); |
| 415 | } |
| 416 | return events ? IRQ_HANDLED : IRQ_NONE; |
| 417 | } |
| 418 | |
| 419 | static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, |
| 420 | unsigned reg, unsigned offset, bool enable) |
| 421 | { |
| 422 | u32 value; |
| 423 | reg += GPIO_REG_OFFSET(offset) * 4; |
| 424 | value = bcm2835_gpio_rd(pc, reg); |
| 425 | if (enable) |
| 426 | value |= BIT(GPIO_REG_SHIFT(offset)); |
| 427 | else |
| 428 | value &= ~(BIT(GPIO_REG_SHIFT(offset))); |
| 429 | bcm2835_gpio_wr(pc, reg, value); |
| 430 | } |
| 431 | |
| 432 | /* fast path for IRQ handler */ |
| 433 | static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, |
| 434 | unsigned offset, bool enable) |
| 435 | { |
| 436 | switch (pc->irq_type[offset]) { |
| 437 | case IRQ_TYPE_EDGE_RISING: |
| 438 | __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable); |
| 439 | break; |
| 440 | |
| 441 | case IRQ_TYPE_EDGE_FALLING: |
| 442 | __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable); |
| 443 | break; |
| 444 | |
| 445 | case IRQ_TYPE_EDGE_BOTH: |
| 446 | __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable); |
| 447 | __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable); |
| 448 | break; |
| 449 | |
| 450 | case IRQ_TYPE_LEVEL_HIGH: |
| 451 | __bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable); |
| 452 | break; |
| 453 | |
| 454 | case IRQ_TYPE_LEVEL_LOW: |
| 455 | __bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable); |
| 456 | break; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | static void bcm2835_gpio_irq_enable(struct irq_data *data) |
| 461 | { |
| 462 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); |
| 463 | unsigned gpio = irqd_to_hwirq(data); |
| 464 | unsigned offset = GPIO_REG_SHIFT(gpio); |
| 465 | unsigned bank = GPIO_REG_OFFSET(gpio); |
| 466 | unsigned long flags; |
| 467 | |
| 468 | spin_lock_irqsave(&pc->irq_lock[bank], flags); |
| 469 | set_bit(offset, &pc->enabled_irq_map[bank]); |
| 470 | bcm2835_gpio_irq_config(pc, gpio, true); |
| 471 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); |
| 472 | } |
| 473 | |
| 474 | static void bcm2835_gpio_irq_disable(struct irq_data *data) |
| 475 | { |
| 476 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); |
| 477 | unsigned gpio = irqd_to_hwirq(data); |
| 478 | unsigned offset = GPIO_REG_SHIFT(gpio); |
| 479 | unsigned bank = GPIO_REG_OFFSET(gpio); |
| 480 | unsigned long flags; |
| 481 | |
| 482 | spin_lock_irqsave(&pc->irq_lock[bank], flags); |
| 483 | bcm2835_gpio_irq_config(pc, gpio, false); |
| 484 | clear_bit(offset, &pc->enabled_irq_map[bank]); |
| 485 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); |
| 486 | } |
| 487 | |
| 488 | static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc, |
| 489 | unsigned offset, unsigned int type) |
| 490 | { |
| 491 | switch (type) { |
| 492 | case IRQ_TYPE_NONE: |
| 493 | case IRQ_TYPE_EDGE_RISING: |
| 494 | case IRQ_TYPE_EDGE_FALLING: |
| 495 | case IRQ_TYPE_EDGE_BOTH: |
| 496 | case IRQ_TYPE_LEVEL_HIGH: |
| 497 | case IRQ_TYPE_LEVEL_LOW: |
| 498 | pc->irq_type[offset] = type; |
| 499 | break; |
| 500 | |
| 501 | default: |
| 502 | return -EINVAL; |
| 503 | } |
| 504 | return 0; |
| 505 | } |
| 506 | |
| 507 | /* slower path for reconfiguring IRQ type */ |
| 508 | static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc, |
| 509 | unsigned offset, unsigned int type) |
| 510 | { |
| 511 | switch (type) { |
| 512 | case IRQ_TYPE_NONE: |
| 513 | if (pc->irq_type[offset] != type) { |
| 514 | bcm2835_gpio_irq_config(pc, offset, false); |
| 515 | pc->irq_type[offset] = type; |
| 516 | } |
| 517 | break; |
| 518 | |
| 519 | case IRQ_TYPE_EDGE_RISING: |
| 520 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) { |
| 521 | /* RISING already enabled, disable FALLING */ |
| 522 | pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING; |
| 523 | bcm2835_gpio_irq_config(pc, offset, false); |
| 524 | pc->irq_type[offset] = type; |
| 525 | } else if (pc->irq_type[offset] != type) { |
| 526 | bcm2835_gpio_irq_config(pc, offset, false); |
| 527 | pc->irq_type[offset] = type; |
| 528 | bcm2835_gpio_irq_config(pc, offset, true); |
| 529 | } |
| 530 | break; |
| 531 | |
| 532 | case IRQ_TYPE_EDGE_FALLING: |
| 533 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) { |
| 534 | /* FALLING already enabled, disable RISING */ |
| 535 | pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING; |
| 536 | bcm2835_gpio_irq_config(pc, offset, false); |
| 537 | pc->irq_type[offset] = type; |
| 538 | } else if (pc->irq_type[offset] != type) { |
| 539 | bcm2835_gpio_irq_config(pc, offset, false); |
| 540 | pc->irq_type[offset] = type; |
| 541 | bcm2835_gpio_irq_config(pc, offset, true); |
| 542 | } |
| 543 | break; |
| 544 | |
| 545 | case IRQ_TYPE_EDGE_BOTH: |
| 546 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) { |
| 547 | /* RISING already enabled, enable FALLING too */ |
| 548 | pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING; |
| 549 | bcm2835_gpio_irq_config(pc, offset, true); |
| 550 | pc->irq_type[offset] = type; |
| 551 | } else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) { |
| 552 | /* FALLING already enabled, enable RISING too */ |
| 553 | pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING; |
| 554 | bcm2835_gpio_irq_config(pc, offset, true); |
| 555 | pc->irq_type[offset] = type; |
| 556 | } else if (pc->irq_type[offset] != type) { |
| 557 | bcm2835_gpio_irq_config(pc, offset, false); |
| 558 | pc->irq_type[offset] = type; |
| 559 | bcm2835_gpio_irq_config(pc, offset, true); |
| 560 | } |
| 561 | break; |
| 562 | |
| 563 | case IRQ_TYPE_LEVEL_HIGH: |
| 564 | case IRQ_TYPE_LEVEL_LOW: |
| 565 | if (pc->irq_type[offset] != type) { |
| 566 | bcm2835_gpio_irq_config(pc, offset, false); |
| 567 | pc->irq_type[offset] = type; |
| 568 | bcm2835_gpio_irq_config(pc, offset, true); |
| 569 | } |
| 570 | break; |
| 571 | |
| 572 | default: |
| 573 | return -EINVAL; |
| 574 | } |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type) |
| 579 | { |
| 580 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); |
| 581 | unsigned gpio = irqd_to_hwirq(data); |
| 582 | unsigned offset = GPIO_REG_SHIFT(gpio); |
| 583 | unsigned bank = GPIO_REG_OFFSET(gpio); |
| 584 | unsigned long flags; |
| 585 | int ret; |
| 586 | |
| 587 | spin_lock_irqsave(&pc->irq_lock[bank], flags); |
| 588 | |
| 589 | if (test_bit(offset, &pc->enabled_irq_map[bank])) |
| 590 | ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type); |
| 591 | else |
| 592 | ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type); |
| 593 | |
| 594 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); |
| 595 | |
| 596 | return ret; |
| 597 | } |
| 598 | |
| 599 | static struct irq_chip bcm2835_gpio_irq_chip = { |
| 600 | .name = MODULE_NAME, |
| 601 | .irq_enable = bcm2835_gpio_irq_enable, |
| 602 | .irq_disable = bcm2835_gpio_irq_disable, |
| 603 | .irq_set_type = bcm2835_gpio_irq_set_type, |
| 604 | }; |
| 605 | |
| 606 | static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev) |
| 607 | { |
| 608 | return ARRAY_SIZE(bcm2835_gpio_groups); |
| 609 | } |
| 610 | |
| 611 | static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev, |
| 612 | unsigned selector) |
| 613 | { |
| 614 | return bcm2835_gpio_groups[selector]; |
| 615 | } |
| 616 | |
| 617 | static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev, |
| 618 | unsigned selector, |
| 619 | const unsigned **pins, |
| 620 | unsigned *num_pins) |
| 621 | { |
| 622 | *pins = &bcm2835_gpio_pins[selector].number; |
| 623 | *num_pins = 1; |
| 624 | |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev, |
| 629 | struct seq_file *s, |
| 630 | unsigned offset) |
| 631 | { |
| 632 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 633 | enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset); |
| 634 | const char *fname = bcm2835_functions[fsel]; |
| 635 | int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset); |
| 636 | int irq = irq_find_mapping(pc->irq_domain, offset); |
| 637 | |
| 638 | seq_printf(s, "function %s in %s; irq %d (%s)", |
| 639 | fname, value ? "hi" : "lo", |
| 640 | irq, irq_type_names[pc->irq_type[offset]]); |
| 641 | } |
| 642 | |
| 643 | static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev, |
| 644 | struct pinctrl_map *maps, unsigned num_maps) |
| 645 | { |
| 646 | int i; |
| 647 | |
| 648 | for (i = 0; i < num_maps; i++) |
| 649 | if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN) |
| 650 | kfree(maps[i].data.configs.configs); |
| 651 | |
| 652 | kfree(maps); |
| 653 | } |
| 654 | |
| 655 | static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc, |
| 656 | struct device_node *np, u32 pin, u32 fnum, |
| 657 | struct pinctrl_map **maps) |
| 658 | { |
| 659 | struct pinctrl_map *map = *maps; |
| 660 | |
| 661 | if (fnum >= ARRAY_SIZE(bcm2835_functions)) { |
| 662 | dev_err(pc->dev, "%s: invalid brcm,function %d\n", |
| 663 | of_node_full_name(np), fnum); |
| 664 | return -EINVAL; |
| 665 | } |
| 666 | |
| 667 | map->type = PIN_MAP_TYPE_MUX_GROUP; |
| 668 | map->data.mux.group = bcm2835_gpio_groups[pin]; |
| 669 | map->data.mux.function = bcm2835_functions[fnum]; |
| 670 | (*maps)++; |
| 671 | |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc, |
| 676 | struct device_node *np, u32 pin, u32 pull, |
| 677 | struct pinctrl_map **maps) |
| 678 | { |
| 679 | struct pinctrl_map *map = *maps; |
| 680 | unsigned long *configs; |
| 681 | |
| 682 | if (pull > 2) { |
| 683 | dev_err(pc->dev, "%s: invalid brcm,pull %d\n", |
| 684 | of_node_full_name(np), pull); |
| 685 | return -EINVAL; |
| 686 | } |
| 687 | |
| 688 | configs = kzalloc(sizeof(*configs), GFP_KERNEL); |
| 689 | if (!configs) |
| 690 | return -ENOMEM; |
| 691 | configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull); |
| 692 | |
| 693 | map->type = PIN_MAP_TYPE_CONFIGS_PIN; |
| 694 | map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name; |
| 695 | map->data.configs.configs = configs; |
| 696 | map->data.configs.num_configs = 1; |
| 697 | (*maps)++; |
| 698 | |
| 699 | return 0; |
| 700 | } |
| 701 | |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 702 | static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, |
| 703 | struct device_node *np, |
| 704 | struct pinctrl_map **map, unsigned *num_maps) |
| 705 | { |
| 706 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 707 | struct property *pins, *funcs, *pulls; |
| 708 | int num_pins, num_funcs, num_pulls, maps_per_pin; |
| 709 | struct pinctrl_map *maps, *cur_map; |
| 710 | int i, err; |
| 711 | u32 pin, func, pull; |
| 712 | |
| 713 | pins = of_find_property(np, "brcm,pins", NULL); |
| 714 | if (!pins) { |
| 715 | dev_err(pc->dev, "%s: missing brcm,pins property\n", |
| 716 | of_node_full_name(np)); |
| 717 | return -EINVAL; |
| 718 | } |
| 719 | |
| 720 | funcs = of_find_property(np, "brcm,function", NULL); |
| 721 | pulls = of_find_property(np, "brcm,pull", NULL); |
| 722 | |
| 723 | if (!funcs && !pulls) { |
| 724 | dev_err(pc->dev, |
| 725 | "%s: neither brcm,function nor brcm,pull specified\n", |
| 726 | of_node_full_name(np)); |
| 727 | return -EINVAL; |
| 728 | } |
| 729 | |
| 730 | num_pins = pins->length / 4; |
| 731 | num_funcs = funcs ? (funcs->length / 4) : 0; |
| 732 | num_pulls = pulls ? (pulls->length / 4) : 0; |
| 733 | |
| 734 | if (num_funcs > 1 && num_funcs != num_pins) { |
| 735 | dev_err(pc->dev, |
| 736 | "%s: brcm,function must have 1 or %d entries\n", |
| 737 | of_node_full_name(np), num_pins); |
| 738 | return -EINVAL; |
| 739 | } |
| 740 | |
| 741 | if (num_pulls > 1 && num_pulls != num_pins) { |
| 742 | dev_err(pc->dev, |
| 743 | "%s: brcm,pull must have 1 or %d entries\n", |
| 744 | of_node_full_name(np), num_pins); |
| 745 | return -EINVAL; |
| 746 | } |
| 747 | |
| 748 | maps_per_pin = 0; |
| 749 | if (num_funcs) |
| 750 | maps_per_pin++; |
| 751 | if (num_pulls) |
| 752 | maps_per_pin++; |
| 753 | cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps), |
| 754 | GFP_KERNEL); |
| 755 | if (!maps) |
| 756 | return -ENOMEM; |
| 757 | |
| 758 | for (i = 0; i < num_pins; i++) { |
Stephen Warren | ce63d6d | 2013-03-28 05:09:57 +0000 | [diff] [blame] | 759 | err = of_property_read_u32_index(np, "brcm,pins", i, &pin); |
| 760 | if (err) |
| 761 | goto out; |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 762 | if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) { |
| 763 | dev_err(pc->dev, "%s: invalid brcm,pins value %d\n", |
| 764 | of_node_full_name(np), pin); |
| 765 | err = -EINVAL; |
| 766 | goto out; |
| 767 | } |
| 768 | |
| 769 | if (num_funcs) { |
Stephen Warren | ce63d6d | 2013-03-28 05:09:57 +0000 | [diff] [blame] | 770 | err = of_property_read_u32_index(np, "brcm,function", |
| 771 | (num_funcs > 1) ? i : 0, &func); |
| 772 | if (err) |
| 773 | goto out; |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 774 | err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin, |
| 775 | func, &cur_map); |
| 776 | if (err) |
| 777 | goto out; |
| 778 | } |
| 779 | if (num_pulls) { |
Stephen Warren | ce63d6d | 2013-03-28 05:09:57 +0000 | [diff] [blame] | 780 | err = of_property_read_u32_index(np, "brcm,pull", |
| 781 | (num_funcs > 1) ? i : 0, &pull); |
| 782 | if (err) |
| 783 | goto out; |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 784 | err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin, |
| 785 | pull, &cur_map); |
| 786 | if (err) |
| 787 | goto out; |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | *map = maps; |
| 792 | *num_maps = num_pins * maps_per_pin; |
| 793 | |
| 794 | return 0; |
| 795 | |
| 796 | out: |
| 797 | kfree(maps); |
| 798 | return err; |
| 799 | } |
| 800 | |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 801 | static const struct pinctrl_ops bcm2835_pctl_ops = { |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 802 | .get_groups_count = bcm2835_pctl_get_groups_count, |
| 803 | .get_group_name = bcm2835_pctl_get_group_name, |
| 804 | .get_group_pins = bcm2835_pctl_get_group_pins, |
| 805 | .pin_dbg_show = bcm2835_pctl_pin_dbg_show, |
| 806 | .dt_node_to_map = bcm2835_pctl_dt_node_to_map, |
| 807 | .dt_free_map = bcm2835_pctl_dt_free_map, |
| 808 | }; |
| 809 | |
| 810 | static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev) |
| 811 | { |
| 812 | return BCM2835_FSEL_COUNT; |
| 813 | } |
| 814 | |
| 815 | static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev, |
| 816 | unsigned selector) |
| 817 | { |
| 818 | return bcm2835_functions[selector]; |
| 819 | } |
| 820 | |
| 821 | static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev, |
| 822 | unsigned selector, |
| 823 | const char * const **groups, |
| 824 | unsigned * const num_groups) |
| 825 | { |
| 826 | /* every pin can do every function */ |
| 827 | *groups = bcm2835_gpio_groups; |
| 828 | *num_groups = ARRAY_SIZE(bcm2835_gpio_groups); |
| 829 | |
| 830 | return 0; |
| 831 | } |
| 832 | |
| 833 | static int bcm2835_pmx_enable(struct pinctrl_dev *pctldev, |
| 834 | unsigned func_selector, |
| 835 | unsigned group_selector) |
| 836 | { |
| 837 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 838 | |
| 839 | bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector); |
| 840 | |
| 841 | return 0; |
| 842 | } |
| 843 | |
| 844 | static void bcm2835_pmx_disable(struct pinctrl_dev *pctldev, |
| 845 | unsigned func_selector, |
| 846 | unsigned group_selector) |
| 847 | { |
| 848 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 849 | |
| 850 | /* disable by setting to GPIO_IN */ |
| 851 | bcm2835_pinctrl_fsel_set(pc, group_selector, BCM2835_FSEL_GPIO_IN); |
| 852 | } |
| 853 | |
| 854 | static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, |
| 855 | struct pinctrl_gpio_range *range, |
| 856 | unsigned offset) |
| 857 | { |
| 858 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 859 | |
| 860 | /* disable by setting to GPIO_IN */ |
| 861 | bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN); |
| 862 | } |
| 863 | |
| 864 | static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, |
| 865 | struct pinctrl_gpio_range *range, |
| 866 | unsigned offset, |
| 867 | bool input) |
| 868 | { |
| 869 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 870 | enum bcm2835_fsel fsel = input ? |
| 871 | BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT; |
| 872 | |
| 873 | bcm2835_pinctrl_fsel_set(pc, offset, fsel); |
| 874 | |
| 875 | return 0; |
| 876 | } |
| 877 | |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 878 | static const struct pinmux_ops bcm2835_pmx_ops = { |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 879 | .get_functions_count = bcm2835_pmx_get_functions_count, |
| 880 | .get_function_name = bcm2835_pmx_get_function_name, |
| 881 | .get_function_groups = bcm2835_pmx_get_function_groups, |
| 882 | .enable = bcm2835_pmx_enable, |
| 883 | .disable = bcm2835_pmx_disable, |
| 884 | .gpio_disable_free = bcm2835_pmx_gpio_disable_free, |
| 885 | .gpio_set_direction = bcm2835_pmx_gpio_set_direction, |
| 886 | }; |
| 887 | |
| 888 | static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev, |
| 889 | unsigned pin, unsigned long *config) |
| 890 | { |
| 891 | /* No way to read back config in HW */ |
| 892 | return -ENOTSUPP; |
| 893 | } |
| 894 | |
| 895 | static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev, |
| 896 | unsigned pin, unsigned long config) |
| 897 | { |
| 898 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); |
| 899 | enum bcm2835_pinconf_param param = BCM2835_PINCONF_UNPACK_PARAM(config); |
| 900 | u16 arg = BCM2835_PINCONF_UNPACK_ARG(config); |
| 901 | u32 off, bit; |
| 902 | |
| 903 | if (param != BCM2835_PINCONF_PARAM_PULL) |
| 904 | return -EINVAL; |
| 905 | |
| 906 | off = GPIO_REG_OFFSET(pin); |
| 907 | bit = GPIO_REG_SHIFT(pin); |
| 908 | |
| 909 | bcm2835_gpio_wr(pc, GPPUD, arg & 3); |
| 910 | /* |
| 911 | * Docs say to wait 150 cycles, but not of what. We assume a |
| 912 | * 1 MHz clock here, which is pretty slow... |
| 913 | */ |
| 914 | udelay(150); |
| 915 | bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit)); |
| 916 | udelay(150); |
| 917 | bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0); |
| 918 | |
| 919 | return 0; |
| 920 | } |
| 921 | |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 922 | static const struct pinconf_ops bcm2835_pinconf_ops = { |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 923 | .pin_config_get = bcm2835_pinconf_get, |
| 924 | .pin_config_set = bcm2835_pinconf_set, |
| 925 | }; |
| 926 | |
| 927 | static struct pinctrl_desc bcm2835_pinctrl_desc = { |
| 928 | .name = MODULE_NAME, |
| 929 | .pins = bcm2835_gpio_pins, |
| 930 | .npins = ARRAY_SIZE(bcm2835_gpio_pins), |
| 931 | .pctlops = &bcm2835_pctl_ops, |
| 932 | .pmxops = &bcm2835_pmx_ops, |
| 933 | .confops = &bcm2835_pinconf_ops, |
| 934 | .owner = THIS_MODULE, |
| 935 | }; |
| 936 | |
Bill Pemberton | 84db00b | 2012-11-19 13:25:13 -0500 | [diff] [blame] | 937 | static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = { |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 938 | .name = MODULE_NAME, |
| 939 | .npins = BCM2835_NUM_GPIOS, |
| 940 | }; |
| 941 | |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 942 | static int bcm2835_pinctrl_probe(struct platform_device *pdev) |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 943 | { |
| 944 | struct device *dev = &pdev->dev; |
| 945 | struct device_node *np = dev->of_node; |
| 946 | struct bcm2835_pinctrl *pc; |
| 947 | struct resource iomem; |
| 948 | int err, i; |
| 949 | BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS); |
| 950 | BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS); |
| 951 | |
| 952 | pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); |
| 953 | if (!pc) |
| 954 | return -ENOMEM; |
| 955 | |
| 956 | platform_set_drvdata(pdev, pc); |
| 957 | pc->dev = dev; |
| 958 | |
| 959 | err = of_address_to_resource(np, 0, &iomem); |
| 960 | if (err) { |
| 961 | dev_err(dev, "could not get IO memory\n"); |
| 962 | return err; |
| 963 | } |
| 964 | |
Thierry Reding | 9e0c1fb | 2013-01-21 11:09:14 +0100 | [diff] [blame] | 965 | pc->base = devm_ioremap_resource(dev, &iomem); |
| 966 | if (IS_ERR(pc->base)) |
| 967 | return PTR_ERR(pc->base); |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 968 | |
| 969 | pc->gpio_chip = bcm2835_gpio_chip; |
| 970 | pc->gpio_chip.dev = dev; |
| 971 | pc->gpio_chip.of_node = np; |
| 972 | |
| 973 | pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS, |
| 974 | &irq_domain_simple_ops, NULL); |
| 975 | if (!pc->irq_domain) { |
| 976 | dev_err(dev, "could not create IRQ domain\n"); |
| 977 | return -ENOMEM; |
| 978 | } |
| 979 | |
| 980 | for (i = 0; i < BCM2835_NUM_GPIOS; i++) { |
| 981 | int irq = irq_create_mapping(pc->irq_domain, i); |
| 982 | irq_set_lockdep_class(irq, &gpio_lock_class); |
| 983 | irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip, |
| 984 | handle_simple_irq); |
| 985 | irq_set_chip_data(irq, pc); |
| 986 | set_irq_flags(irq, IRQF_VALID); |
| 987 | } |
| 988 | |
| 989 | for (i = 0; i < BCM2835_NUM_BANKS; i++) { |
| 990 | unsigned long events; |
| 991 | unsigned offset; |
| 992 | int len; |
| 993 | char *name; |
| 994 | |
| 995 | /* clear event detection flags */ |
| 996 | bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0); |
| 997 | bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0); |
| 998 | bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0); |
| 999 | bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0); |
| 1000 | bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0); |
| 1001 | bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0); |
| 1002 | |
| 1003 | /* clear all the events */ |
| 1004 | events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4); |
| 1005 | for_each_set_bit(offset, &events, 32) |
| 1006 | bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset)); |
| 1007 | |
| 1008 | pc->irq[i] = irq_of_parse_and_map(np, i); |
| 1009 | pc->irq_data[i].pc = pc; |
| 1010 | pc->irq_data[i].bank = i; |
| 1011 | spin_lock_init(&pc->irq_lock[i]); |
| 1012 | |
| 1013 | len = strlen(dev_name(pc->dev)) + 16; |
| 1014 | name = devm_kzalloc(pc->dev, len, GFP_KERNEL); |
| 1015 | if (!name) |
| 1016 | return -ENOMEM; |
| 1017 | snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i); |
| 1018 | |
| 1019 | err = devm_request_irq(dev, pc->irq[i], |
| 1020 | bcm2835_gpio_irq_handler, IRQF_SHARED, |
| 1021 | name, &pc->irq_data[i]); |
| 1022 | if (err) { |
| 1023 | dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]); |
| 1024 | return err; |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | err = gpiochip_add(&pc->gpio_chip); |
| 1029 | if (err) { |
| 1030 | dev_err(dev, "could not add GPIO chip\n"); |
| 1031 | return err; |
| 1032 | } |
| 1033 | |
| 1034 | pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc); |
| 1035 | if (!pc->pctl_dev) { |
| 1036 | gpiochip_remove(&pc->gpio_chip); |
Wei Yongjun | 3ee73aa | 2012-10-07 22:01:15 +0800 | [diff] [blame] | 1037 | return -EINVAL; |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | pc->gpio_range = bcm2835_pinctrl_gpio_range; |
| 1041 | pc->gpio_range.base = pc->gpio_chip.base; |
| 1042 | pc->gpio_range.gc = &pc->gpio_chip; |
| 1043 | pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range); |
| 1044 | |
| 1045 | return 0; |
| 1046 | } |
| 1047 | |
Bill Pemberton | f90f54b | 2012-11-19 13:26:06 -0500 | [diff] [blame] | 1048 | static int bcm2835_pinctrl_remove(struct platform_device *pdev) |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 1049 | { |
| 1050 | struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev); |
| 1051 | |
| 1052 | pinctrl_unregister(pc->pctl_dev); |
| 1053 | gpiochip_remove(&pc->gpio_chip); |
| 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Bill Pemberton | 84db00b | 2012-11-19 13:25:13 -0500 | [diff] [blame] | 1058 | static struct of_device_id bcm2835_pinctrl_match[] = { |
Simon Arlott | e1b2dc7 | 2012-09-27 22:10:11 -0600 | [diff] [blame] | 1059 | { .compatible = "brcm,bcm2835-gpio" }, |
| 1060 | {} |
| 1061 | }; |
| 1062 | MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match); |
| 1063 | |
| 1064 | static struct platform_driver bcm2835_pinctrl_driver = { |
| 1065 | .probe = bcm2835_pinctrl_probe, |
| 1066 | .remove = bcm2835_pinctrl_remove, |
| 1067 | .driver = { |
| 1068 | .name = MODULE_NAME, |
| 1069 | .owner = THIS_MODULE, |
| 1070 | .of_match_table = bcm2835_pinctrl_match, |
| 1071 | }, |
| 1072 | }; |
| 1073 | module_platform_driver(bcm2835_pinctrl_driver); |
| 1074 | |
| 1075 | MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren"); |
| 1076 | MODULE_DESCRIPTION("BCM2835 Pin control driver"); |
| 1077 | MODULE_LICENSE("GPL"); |