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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/driver.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> | |
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 | static 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_direction_input(struct gpio_chip *chip, unsigned offset) | |
334 | { | |
335 | return pinctrl_gpio_direction_input(chip->base + offset); | |
336 | } | |
337 | ||
338 | static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset) | |
339 | { | |
340 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
341 | ||
342 | return bcm2835_gpio_get_bit(pc, GPLEV0, offset); | |
343 | } | |
344 | ||
345 | static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
346 | { | |
347 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
348 | ||
349 | bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset); | |
350 | } | |
351 | ||
352 | static int bcm2835_gpio_direction_output(struct gpio_chip *chip, | |
353 | unsigned offset, int value) | |
354 | { | |
355 | bcm2835_gpio_set(chip, offset, value); | |
356 | return pinctrl_gpio_direction_output(chip->base + offset); | |
357 | } | |
358 | ||
359 | static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | |
360 | { | |
361 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
362 | ||
363 | return irq_linear_revmap(pc->irq_domain, offset); | |
364 | } | |
365 | ||
366 | static struct gpio_chip bcm2835_gpio_chip = { | |
367 | .label = MODULE_NAME, | |
368 | .owner = THIS_MODULE, | |
369 | .request = gpiochip_generic_request, | |
370 | .free = gpiochip_generic_free, | |
371 | .direction_input = bcm2835_gpio_direction_input, | |
372 | .direction_output = bcm2835_gpio_direction_output, | |
373 | .get = bcm2835_gpio_get, | |
374 | .set = bcm2835_gpio_set, | |
375 | .to_irq = bcm2835_gpio_to_irq, | |
376 | .base = -1, | |
377 | .ngpio = BCM2835_NUM_GPIOS, | |
378 | .can_sleep = false, | |
379 | }; | |
380 | ||
381 | static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id) | |
382 | { | |
383 | struct bcm2835_gpio_irqdata *irqdata = dev_id; | |
384 | struct bcm2835_pinctrl *pc = irqdata->pc; | |
385 | int bank = irqdata->bank; | |
386 | unsigned long events; | |
387 | unsigned offset; | |
388 | unsigned gpio; | |
389 | unsigned int type; | |
390 | ||
391 | events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4); | |
392 | events &= pc->enabled_irq_map[bank]; | |
393 | for_each_set_bit(offset, &events, 32) { | |
394 | gpio = (32 * bank) + offset; | |
395 | type = pc->irq_type[gpio]; | |
396 | ||
397 | generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio)); | |
398 | } | |
399 | return events ? IRQ_HANDLED : IRQ_NONE; | |
400 | } | |
401 | ||
402 | static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, | |
403 | unsigned reg, unsigned offset, bool enable) | |
404 | { | |
405 | u32 value; | |
406 | reg += GPIO_REG_OFFSET(offset) * 4; | |
407 | value = bcm2835_gpio_rd(pc, reg); | |
408 | if (enable) | |
409 | value |= BIT(GPIO_REG_SHIFT(offset)); | |
410 | else | |
411 | value &= ~(BIT(GPIO_REG_SHIFT(offset))); | |
412 | bcm2835_gpio_wr(pc, reg, value); | |
413 | } | |
414 | ||
415 | /* fast path for IRQ handler */ | |
416 | static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, | |
417 | unsigned offset, bool enable) | |
418 | { | |
419 | switch (pc->irq_type[offset]) { | |
420 | case IRQ_TYPE_EDGE_RISING: | |
421 | __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable); | |
422 | break; | |
423 | ||
424 | case IRQ_TYPE_EDGE_FALLING: | |
425 | __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable); | |
426 | break; | |
427 | ||
428 | case IRQ_TYPE_EDGE_BOTH: | |
429 | __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable); | |
430 | __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable); | |
431 | break; | |
432 | ||
433 | case IRQ_TYPE_LEVEL_HIGH: | |
434 | __bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable); | |
435 | break; | |
436 | ||
437 | case IRQ_TYPE_LEVEL_LOW: | |
438 | __bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable); | |
439 | break; | |
440 | } | |
441 | } | |
442 | ||
443 | static void bcm2835_gpio_irq_enable(struct irq_data *data) | |
444 | { | |
445 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); | |
446 | unsigned gpio = irqd_to_hwirq(data); | |
447 | unsigned offset = GPIO_REG_SHIFT(gpio); | |
448 | unsigned bank = GPIO_REG_OFFSET(gpio); | |
449 | unsigned long flags; | |
450 | ||
451 | spin_lock_irqsave(&pc->irq_lock[bank], flags); | |
452 | set_bit(offset, &pc->enabled_irq_map[bank]); | |
453 | bcm2835_gpio_irq_config(pc, gpio, true); | |
454 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); | |
455 | } | |
456 | ||
457 | static void bcm2835_gpio_irq_disable(struct irq_data *data) | |
458 | { | |
459 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); | |
460 | unsigned gpio = irqd_to_hwirq(data); | |
461 | unsigned offset = GPIO_REG_SHIFT(gpio); | |
462 | unsigned bank = GPIO_REG_OFFSET(gpio); | |
463 | unsigned long flags; | |
464 | ||
465 | spin_lock_irqsave(&pc->irq_lock[bank], flags); | |
466 | bcm2835_gpio_irq_config(pc, gpio, false); | |
467 | /* Clear events that were latched prior to clearing event sources */ | |
468 | bcm2835_gpio_set_bit(pc, GPEDS0, gpio); | |
469 | clear_bit(offset, &pc->enabled_irq_map[bank]); | |
470 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); | |
471 | } | |
472 | ||
473 | static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc, | |
474 | unsigned offset, unsigned int type) | |
475 | { | |
476 | switch (type) { | |
477 | case IRQ_TYPE_NONE: | |
478 | case IRQ_TYPE_EDGE_RISING: | |
479 | case IRQ_TYPE_EDGE_FALLING: | |
480 | case IRQ_TYPE_EDGE_BOTH: | |
481 | case IRQ_TYPE_LEVEL_HIGH: | |
482 | case IRQ_TYPE_LEVEL_LOW: | |
483 | pc->irq_type[offset] = type; | |
484 | break; | |
485 | ||
486 | default: | |
487 | return -EINVAL; | |
488 | } | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* slower path for reconfiguring IRQ type */ | |
493 | static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc, | |
494 | unsigned offset, unsigned int type) | |
495 | { | |
496 | switch (type) { | |
497 | case IRQ_TYPE_NONE: | |
498 | if (pc->irq_type[offset] != type) { | |
499 | bcm2835_gpio_irq_config(pc, offset, false); | |
500 | pc->irq_type[offset] = type; | |
501 | } | |
502 | break; | |
503 | ||
504 | case IRQ_TYPE_EDGE_RISING: | |
505 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) { | |
506 | /* RISING already enabled, disable FALLING */ | |
507 | pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING; | |
508 | bcm2835_gpio_irq_config(pc, offset, false); | |
509 | pc->irq_type[offset] = type; | |
510 | } else if (pc->irq_type[offset] != type) { | |
511 | bcm2835_gpio_irq_config(pc, offset, false); | |
512 | pc->irq_type[offset] = type; | |
513 | bcm2835_gpio_irq_config(pc, offset, true); | |
514 | } | |
515 | break; | |
516 | ||
517 | case IRQ_TYPE_EDGE_FALLING: | |
518 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) { | |
519 | /* FALLING already enabled, disable RISING */ | |
520 | pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING; | |
521 | bcm2835_gpio_irq_config(pc, offset, false); | |
522 | pc->irq_type[offset] = type; | |
523 | } else if (pc->irq_type[offset] != type) { | |
524 | bcm2835_gpio_irq_config(pc, offset, false); | |
525 | pc->irq_type[offset] = type; | |
526 | bcm2835_gpio_irq_config(pc, offset, true); | |
527 | } | |
528 | break; | |
529 | ||
530 | case IRQ_TYPE_EDGE_BOTH: | |
531 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) { | |
532 | /* RISING already enabled, enable FALLING too */ | |
533 | pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING; | |
534 | bcm2835_gpio_irq_config(pc, offset, true); | |
535 | pc->irq_type[offset] = type; | |
536 | } else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) { | |
537 | /* FALLING already enabled, enable RISING too */ | |
538 | pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING; | |
539 | bcm2835_gpio_irq_config(pc, offset, true); | |
540 | pc->irq_type[offset] = type; | |
541 | } else if (pc->irq_type[offset] != type) { | |
542 | bcm2835_gpio_irq_config(pc, offset, false); | |
543 | pc->irq_type[offset] = type; | |
544 | bcm2835_gpio_irq_config(pc, offset, true); | |
545 | } | |
546 | break; | |
547 | ||
548 | case IRQ_TYPE_LEVEL_HIGH: | |
549 | case IRQ_TYPE_LEVEL_LOW: | |
550 | if (pc->irq_type[offset] != type) { | |
551 | bcm2835_gpio_irq_config(pc, offset, false); | |
552 | pc->irq_type[offset] = type; | |
553 | bcm2835_gpio_irq_config(pc, offset, true); | |
554 | } | |
555 | break; | |
556 | ||
557 | default: | |
558 | return -EINVAL; | |
559 | } | |
560 | return 0; | |
561 | } | |
562 | ||
563 | static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type) | |
564 | { | |
565 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); | |
566 | unsigned gpio = irqd_to_hwirq(data); | |
567 | unsigned offset = GPIO_REG_SHIFT(gpio); | |
568 | unsigned bank = GPIO_REG_OFFSET(gpio); | |
569 | unsigned long flags; | |
570 | int ret; | |
571 | ||
572 | spin_lock_irqsave(&pc->irq_lock[bank], flags); | |
573 | ||
574 | if (test_bit(offset, &pc->enabled_irq_map[bank])) | |
575 | ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type); | |
576 | else | |
577 | ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type); | |
578 | ||
579 | if (type & IRQ_TYPE_EDGE_BOTH) | |
580 | irq_set_handler_locked(data, handle_edge_irq); | |
581 | else | |
582 | irq_set_handler_locked(data, handle_level_irq); | |
583 | ||
584 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); | |
585 | ||
586 | return ret; | |
587 | } | |
588 | ||
589 | static void bcm2835_gpio_irq_ack(struct irq_data *data) | |
590 | { | |
591 | struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data); | |
592 | unsigned gpio = irqd_to_hwirq(data); | |
593 | ||
594 | bcm2835_gpio_set_bit(pc, GPEDS0, gpio); | |
595 | } | |
596 | ||
597 | static struct irq_chip bcm2835_gpio_irq_chip = { | |
598 | .name = MODULE_NAME, | |
599 | .irq_enable = bcm2835_gpio_irq_enable, | |
600 | .irq_disable = bcm2835_gpio_irq_disable, | |
601 | .irq_set_type = bcm2835_gpio_irq_set_type, | |
602 | .irq_ack = bcm2835_gpio_irq_ack, | |
603 | .irq_mask = bcm2835_gpio_irq_disable, | |
604 | .irq_unmask = bcm2835_gpio_irq_enable, | |
605 | }; | |
606 | ||
607 | static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev) | |
608 | { | |
609 | return ARRAY_SIZE(bcm2835_gpio_groups); | |
610 | } | |
611 | ||
612 | static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev, | |
613 | unsigned selector) | |
614 | { | |
615 | return bcm2835_gpio_groups[selector]; | |
616 | } | |
617 | ||
618 | static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev, | |
619 | unsigned selector, | |
620 | const unsigned **pins, | |
621 | unsigned *num_pins) | |
622 | { | |
623 | *pins = &bcm2835_gpio_pins[selector].number; | |
624 | *num_pins = 1; | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev, | |
630 | struct seq_file *s, | |
631 | unsigned offset) | |
632 | { | |
633 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
634 | enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset); | |
635 | const char *fname = bcm2835_functions[fsel]; | |
636 | int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset); | |
637 | int irq = irq_find_mapping(pc->irq_domain, offset); | |
638 | ||
639 | seq_printf(s, "function %s in %s; irq %d (%s)", | |
640 | fname, value ? "hi" : "lo", | |
641 | irq, irq_type_names[pc->irq_type[offset]]); | |
642 | } | |
643 | ||
644 | static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev, | |
645 | struct pinctrl_map *maps, unsigned num_maps) | |
646 | { | |
647 | int i; | |
648 | ||
649 | for (i = 0; i < num_maps; i++) | |
650 | if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN) | |
651 | kfree(maps[i].data.configs.configs); | |
652 | ||
653 | kfree(maps); | |
654 | } | |
655 | ||
656 | static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc, | |
657 | struct device_node *np, u32 pin, u32 fnum, | |
658 | struct pinctrl_map **maps) | |
659 | { | |
660 | struct pinctrl_map *map = *maps; | |
661 | ||
662 | if (fnum >= ARRAY_SIZE(bcm2835_functions)) { | |
663 | dev_err(pc->dev, "%s: invalid brcm,function %d\n", | |
664 | of_node_full_name(np), fnum); | |
665 | return -EINVAL; | |
666 | } | |
667 | ||
668 | map->type = PIN_MAP_TYPE_MUX_GROUP; | |
669 | map->data.mux.group = bcm2835_gpio_groups[pin]; | |
670 | map->data.mux.function = bcm2835_functions[fnum]; | |
671 | (*maps)++; | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
676 | static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc, | |
677 | struct device_node *np, u32 pin, u32 pull, | |
678 | struct pinctrl_map **maps) | |
679 | { | |
680 | struct pinctrl_map *map = *maps; | |
681 | unsigned long *configs; | |
682 | ||
683 | if (pull > 2) { | |
684 | dev_err(pc->dev, "%s: invalid brcm,pull %d\n", | |
685 | of_node_full_name(np), pull); | |
686 | return -EINVAL; | |
687 | } | |
688 | ||
689 | configs = kzalloc(sizeof(*configs), GFP_KERNEL); | |
690 | if (!configs) | |
691 | return -ENOMEM; | |
692 | configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull); | |
693 | ||
694 | map->type = PIN_MAP_TYPE_CONFIGS_PIN; | |
695 | map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name; | |
696 | map->data.configs.configs = configs; | |
697 | map->data.configs.num_configs = 1; | |
698 | (*maps)++; | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, | |
704 | struct device_node *np, | |
705 | struct pinctrl_map **map, unsigned *num_maps) | |
706 | { | |
707 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
708 | struct property *pins, *funcs, *pulls; | |
709 | int num_pins, num_funcs, num_pulls, maps_per_pin; | |
710 | struct pinctrl_map *maps, *cur_map; | |
711 | int i, err; | |
712 | u32 pin, func, pull; | |
713 | ||
714 | pins = of_find_property(np, "brcm,pins", NULL); | |
715 | if (!pins) { | |
716 | dev_err(pc->dev, "%s: missing brcm,pins property\n", | |
717 | of_node_full_name(np)); | |
718 | return -EINVAL; | |
719 | } | |
720 | ||
721 | funcs = of_find_property(np, "brcm,function", NULL); | |
722 | pulls = of_find_property(np, "brcm,pull", NULL); | |
723 | ||
724 | if (!funcs && !pulls) { | |
725 | dev_err(pc->dev, | |
726 | "%s: neither brcm,function nor brcm,pull specified\n", | |
727 | of_node_full_name(np)); | |
728 | return -EINVAL; | |
729 | } | |
730 | ||
731 | num_pins = pins->length / 4; | |
732 | num_funcs = funcs ? (funcs->length / 4) : 0; | |
733 | num_pulls = pulls ? (pulls->length / 4) : 0; | |
734 | ||
735 | if (num_funcs > 1 && num_funcs != num_pins) { | |
736 | dev_err(pc->dev, | |
737 | "%s: brcm,function must have 1 or %d entries\n", | |
738 | of_node_full_name(np), num_pins); | |
739 | return -EINVAL; | |
740 | } | |
741 | ||
742 | if (num_pulls > 1 && num_pulls != num_pins) { | |
743 | dev_err(pc->dev, | |
744 | "%s: brcm,pull must have 1 or %d entries\n", | |
745 | of_node_full_name(np), num_pins); | |
746 | return -EINVAL; | |
747 | } | |
748 | ||
749 | maps_per_pin = 0; | |
750 | if (num_funcs) | |
751 | maps_per_pin++; | |
752 | if (num_pulls) | |
753 | maps_per_pin++; | |
754 | cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps), | |
755 | GFP_KERNEL); | |
756 | if (!maps) | |
757 | return -ENOMEM; | |
758 | ||
759 | for (i = 0; i < num_pins; i++) { | |
760 | err = of_property_read_u32_index(np, "brcm,pins", i, &pin); | |
761 | if (err) | |
762 | goto out; | |
763 | if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) { | |
764 | dev_err(pc->dev, "%s: invalid brcm,pins value %d\n", | |
765 | of_node_full_name(np), pin); | |
766 | err = -EINVAL; | |
767 | goto out; | |
768 | } | |
769 | ||
770 | if (num_funcs) { | |
771 | err = of_property_read_u32_index(np, "brcm,function", | |
772 | (num_funcs > 1) ? i : 0, &func); | |
773 | if (err) | |
774 | goto out; | |
775 | err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin, | |
776 | func, &cur_map); | |
777 | if (err) | |
778 | goto out; | |
779 | } | |
780 | if (num_pulls) { | |
781 | err = of_property_read_u32_index(np, "brcm,pull", | |
782 | (num_pulls > 1) ? i : 0, &pull); | |
783 | if (err) | |
784 | goto out; | |
785 | err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin, | |
786 | pull, &cur_map); | |
787 | if (err) | |
788 | goto out; | |
789 | } | |
790 | } | |
791 | ||
792 | *map = maps; | |
793 | *num_maps = num_pins * maps_per_pin; | |
794 | ||
795 | return 0; | |
796 | ||
797 | out: | |
798 | bcm2835_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin); | |
799 | return err; | |
800 | } | |
801 | ||
802 | static const struct pinctrl_ops bcm2835_pctl_ops = { | |
803 | .get_groups_count = bcm2835_pctl_get_groups_count, | |
804 | .get_group_name = bcm2835_pctl_get_group_name, | |
805 | .get_group_pins = bcm2835_pctl_get_group_pins, | |
806 | .pin_dbg_show = bcm2835_pctl_pin_dbg_show, | |
807 | .dt_node_to_map = bcm2835_pctl_dt_node_to_map, | |
808 | .dt_free_map = bcm2835_pctl_dt_free_map, | |
809 | }; | |
810 | ||
811 | static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev) | |
812 | { | |
813 | return BCM2835_FSEL_COUNT; | |
814 | } | |
815 | ||
816 | static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev, | |
817 | unsigned selector) | |
818 | { | |
819 | return bcm2835_functions[selector]; | |
820 | } | |
821 | ||
822 | static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev, | |
823 | unsigned selector, | |
824 | const char * const **groups, | |
825 | unsigned * const num_groups) | |
826 | { | |
827 | /* every pin can do every function */ | |
828 | *groups = bcm2835_gpio_groups; | |
829 | *num_groups = ARRAY_SIZE(bcm2835_gpio_groups); | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
834 | static int bcm2835_pmx_set(struct pinctrl_dev *pctldev, | |
835 | unsigned func_selector, | |
836 | unsigned group_selector) | |
837 | { | |
838 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
839 | ||
840 | bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector); | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, | |
846 | struct pinctrl_gpio_range *range, | |
847 | unsigned offset) | |
848 | { | |
849 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
850 | ||
851 | /* disable by setting to GPIO_IN */ | |
852 | bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN); | |
853 | } | |
854 | ||
855 | static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, | |
856 | struct pinctrl_gpio_range *range, | |
857 | unsigned offset, | |
858 | bool input) | |
859 | { | |
860 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
861 | enum bcm2835_fsel fsel = input ? | |
862 | BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT; | |
863 | ||
864 | bcm2835_pinctrl_fsel_set(pc, offset, fsel); | |
865 | ||
866 | return 0; | |
867 | } | |
868 | ||
869 | static const struct pinmux_ops bcm2835_pmx_ops = { | |
870 | .get_functions_count = bcm2835_pmx_get_functions_count, | |
871 | .get_function_name = bcm2835_pmx_get_function_name, | |
872 | .get_function_groups = bcm2835_pmx_get_function_groups, | |
873 | .set_mux = bcm2835_pmx_set, | |
874 | .gpio_disable_free = bcm2835_pmx_gpio_disable_free, | |
875 | .gpio_set_direction = bcm2835_pmx_gpio_set_direction, | |
876 | }; | |
877 | ||
878 | static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev, | |
879 | unsigned pin, unsigned long *config) | |
880 | { | |
881 | /* No way to read back config in HW */ | |
882 | return -ENOTSUPP; | |
883 | } | |
884 | ||
885 | static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev, | |
886 | unsigned pin, unsigned long *configs, | |
887 | unsigned num_configs) | |
888 | { | |
889 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
890 | enum bcm2835_pinconf_param param; | |
891 | u16 arg; | |
892 | u32 off, bit; | |
893 | int i; | |
894 | ||
895 | for (i = 0; i < num_configs; i++) { | |
896 | param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]); | |
897 | arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]); | |
898 | ||
899 | if (param != BCM2835_PINCONF_PARAM_PULL) | |
900 | return -EINVAL; | |
901 | ||
902 | off = GPIO_REG_OFFSET(pin); | |
903 | bit = GPIO_REG_SHIFT(pin); | |
904 | ||
905 | bcm2835_gpio_wr(pc, GPPUD, arg & 3); | |
906 | /* | |
907 | * Docs say to wait 150 cycles, but not of what. We assume a | |
908 | * 1 MHz clock here, which is pretty slow... | |
909 | */ | |
910 | udelay(150); | |
911 | bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit)); | |
912 | udelay(150); | |
913 | bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0); | |
914 | } /* for each config */ | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | static const struct pinconf_ops bcm2835_pinconf_ops = { | |
920 | .pin_config_get = bcm2835_pinconf_get, | |
921 | .pin_config_set = bcm2835_pinconf_set, | |
922 | }; | |
923 | ||
924 | static struct pinctrl_desc bcm2835_pinctrl_desc = { | |
925 | .name = MODULE_NAME, | |
926 | .pins = bcm2835_gpio_pins, | |
927 | .npins = ARRAY_SIZE(bcm2835_gpio_pins), | |
928 | .pctlops = &bcm2835_pctl_ops, | |
929 | .pmxops = &bcm2835_pmx_ops, | |
930 | .confops = &bcm2835_pinconf_ops, | |
931 | .owner = THIS_MODULE, | |
932 | }; | |
933 | ||
934 | static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = { | |
935 | .name = MODULE_NAME, | |
936 | .npins = BCM2835_NUM_GPIOS, | |
937 | }; | |
938 | ||
939 | static int bcm2835_pinctrl_probe(struct platform_device *pdev) | |
940 | { | |
941 | struct device *dev = &pdev->dev; | |
942 | struct device_node *np = dev->of_node; | |
943 | struct bcm2835_pinctrl *pc; | |
944 | struct resource iomem; | |
945 | int err, i; | |
946 | BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS); | |
947 | BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS); | |
948 | ||
949 | pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); | |
950 | if (!pc) | |
951 | return -ENOMEM; | |
952 | ||
953 | platform_set_drvdata(pdev, pc); | |
954 | pc->dev = dev; | |
955 | ||
956 | err = of_address_to_resource(np, 0, &iomem); | |
957 | if (err) { | |
958 | dev_err(dev, "could not get IO memory\n"); | |
959 | return err; | |
960 | } | |
961 | ||
962 | pc->base = devm_ioremap_resource(dev, &iomem); | |
963 | if (IS_ERR(pc->base)) | |
964 | return PTR_ERR(pc->base); | |
965 | ||
966 | pc->gpio_chip = bcm2835_gpio_chip; | |
967 | pc->gpio_chip.parent = dev; | |
968 | pc->gpio_chip.of_node = np; | |
969 | ||
970 | pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS, | |
971 | &irq_domain_simple_ops, NULL); | |
972 | if (!pc->irq_domain) { | |
973 | dev_err(dev, "could not create IRQ domain\n"); | |
974 | return -ENOMEM; | |
975 | } | |
976 | ||
977 | for (i = 0; i < BCM2835_NUM_GPIOS; i++) { | |
978 | int irq = irq_create_mapping(pc->irq_domain, i); | |
979 | irq_set_lockdep_class(irq, &gpio_lock_class); | |
980 | irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip, | |
981 | handle_level_irq); | |
982 | irq_set_chip_data(irq, pc); | |
983 | } | |
984 | ||
985 | for (i = 0; i < BCM2835_NUM_BANKS; i++) { | |
986 | unsigned long events; | |
987 | unsigned offset; | |
988 | int len; | |
989 | char *name; | |
990 | ||
991 | /* clear event detection flags */ | |
992 | bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0); | |
993 | bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0); | |
994 | bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0); | |
995 | bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0); | |
996 | bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0); | |
997 | bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0); | |
998 | ||
999 | /* clear all the events */ | |
1000 | events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4); | |
1001 | for_each_set_bit(offset, &events, 32) | |
1002 | bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset)); | |
1003 | ||
1004 | pc->irq[i] = irq_of_parse_and_map(np, i); | |
1005 | pc->irq_data[i].pc = pc; | |
1006 | pc->irq_data[i].bank = i; | |
1007 | spin_lock_init(&pc->irq_lock[i]); | |
1008 | ||
1009 | len = strlen(dev_name(pc->dev)) + 16; | |
1010 | name = devm_kzalloc(pc->dev, len, GFP_KERNEL); | |
1011 | if (!name) | |
1012 | return -ENOMEM; | |
1013 | snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i); | |
1014 | ||
1015 | err = devm_request_irq(dev, pc->irq[i], | |
1016 | bcm2835_gpio_irq_handler, IRQF_SHARED, | |
1017 | name, &pc->irq_data[i]); | |
1018 | if (err) { | |
1019 | dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]); | |
1020 | return err; | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | err = gpiochip_add_data(&pc->gpio_chip, pc); | |
1025 | if (err) { | |
1026 | dev_err(dev, "could not add GPIO chip\n"); | |
1027 | return err; | |
1028 | } | |
1029 | ||
1030 | pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc); | |
1031 | if (IS_ERR(pc->pctl_dev)) { | |
1032 | gpiochip_remove(&pc->gpio_chip); | |
1033 | return PTR_ERR(pc->pctl_dev); | |
1034 | } | |
1035 | ||
1036 | pc->gpio_range = bcm2835_pinctrl_gpio_range; | |
1037 | pc->gpio_range.base = pc->gpio_chip.base; | |
1038 | pc->gpio_range.gc = &pc->gpio_chip; | |
1039 | pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range); | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static int bcm2835_pinctrl_remove(struct platform_device *pdev) | |
1045 | { | |
1046 | struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev); | |
1047 | ||
1048 | pinctrl_unregister(pc->pctl_dev); | |
1049 | gpiochip_remove(&pc->gpio_chip); | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static const struct of_device_id bcm2835_pinctrl_match[] = { | |
1055 | { .compatible = "brcm,bcm2835-gpio" }, | |
1056 | {} | |
1057 | }; | |
1058 | MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match); | |
1059 | ||
1060 | static struct platform_driver bcm2835_pinctrl_driver = { | |
1061 | .probe = bcm2835_pinctrl_probe, | |
1062 | .remove = bcm2835_pinctrl_remove, | |
1063 | .driver = { | |
1064 | .name = MODULE_NAME, | |
1065 | .of_match_table = bcm2835_pinctrl_match, | |
1066 | }, | |
1067 | }; | |
1068 | module_platform_driver(bcm2835_pinctrl_driver); | |
1069 | ||
1070 | MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren"); | |
1071 | MODULE_DESCRIPTION("BCM2835 Pin control driver"); | |
1072 | MODULE_LICENSE("GPL"); |