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e1b2dc70 SA |
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> | |
e19a5f79 | 26 | #include <linux/gpio/driver.h> |
e1b2dc70 SA |
27 | #include <linux/io.h> |
28 | #include <linux/irq.h> | |
29 | #include <linux/irqdesc.h> | |
e1b2dc70 SA |
30 | #include <linux/module.h> |
31 | #include <linux/of_address.h> | |
32 | #include <linux/of.h> | |
33 | #include <linux/of_irq.h> | |
34 | #include <linux/pinctrl/consumer.h> | |
35 | #include <linux/pinctrl/machine.h> | |
36 | #include <linux/pinctrl/pinconf.h> | |
37 | #include <linux/pinctrl/pinctrl.h> | |
38 | #include <linux/pinctrl/pinmux.h> | |
39 | #include <linux/platform_device.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/spinlock.h> | |
43 | #include <linux/types.h> | |
44 | ||
45 | #define MODULE_NAME "pinctrl-bcm2835" | |
46 | #define BCM2835_NUM_GPIOS 54 | |
47 | #define BCM2835_NUM_BANKS 2 | |
00445b5d | 48 | #define BCM2835_NUM_IRQS 3 |
e1b2dc70 SA |
49 | |
50 | #define BCM2835_PIN_BITMAP_SZ \ | |
51 | DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8) | |
52 | ||
53 | /* GPIO register offsets */ | |
54 | #define GPFSEL0 0x0 /* Function Select */ | |
55 | #define GPSET0 0x1c /* Pin Output Set */ | |
56 | #define GPCLR0 0x28 /* Pin Output Clear */ | |
57 | #define GPLEV0 0x34 /* Pin Level */ | |
58 | #define GPEDS0 0x40 /* Pin Event Detect Status */ | |
59 | #define GPREN0 0x4c /* Pin Rising Edge Detect Enable */ | |
60 | #define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */ | |
61 | #define GPHEN0 0x64 /* Pin High Detect Enable */ | |
62 | #define GPLEN0 0x70 /* Pin Low Detect Enable */ | |
63 | #define GPAREN0 0x7c /* Pin Async Rising Edge Detect */ | |
64 | #define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */ | |
65 | #define GPPUD 0x94 /* Pin Pull-up/down Enable */ | |
66 | #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */ | |
67 | ||
68 | #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4)) | |
69 | #define FSEL_SHIFT(p) (((p) % 10) * 3) | |
70 | #define GPIO_REG_OFFSET(p) ((p) / 32) | |
71 | #define GPIO_REG_SHIFT(p) ((p) % 32) | |
72 | ||
73 | enum bcm2835_pinconf_param { | |
74 | /* argument: bcm2835_pinconf_pull */ | |
75 | BCM2835_PINCONF_PARAM_PULL, | |
76 | }; | |
77 | ||
e1b2dc70 SA |
78 | #define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_)) |
79 | #define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16) | |
80 | #define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff) | |
81 | ||
e1b2dc70 SA |
82 | struct bcm2835_pinctrl { |
83 | struct device *dev; | |
84 | void __iomem *base; | |
00445b5d | 85 | int irq[BCM2835_NUM_IRQS]; |
e1b2dc70 SA |
86 | |
87 | /* note: locking assumes each bank will have its own unsigned long */ | |
88 | unsigned long enabled_irq_map[BCM2835_NUM_BANKS]; | |
89 | unsigned int irq_type[BCM2835_NUM_GPIOS]; | |
90 | ||
91 | struct pinctrl_dev *pctl_dev; | |
e1b2dc70 SA |
92 | struct gpio_chip gpio_chip; |
93 | struct pinctrl_gpio_range gpio_range; | |
94 | ||
85ae9e51 | 95 | int irq_group[BCM2835_NUM_IRQS]; |
e1b2dc70 SA |
96 | spinlock_t irq_lock[BCM2835_NUM_BANKS]; |
97 | }; | |
98 | ||
e1b2dc70 SA |
99 | /* pins are just named GPIO0..GPIO53 */ |
100 | #define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a) | |
e8ed912e | 101 | static struct pinctrl_pin_desc bcm2835_gpio_pins[] = { |
e1b2dc70 SA |
102 | BCM2835_GPIO_PIN(0), |
103 | BCM2835_GPIO_PIN(1), | |
104 | BCM2835_GPIO_PIN(2), | |
105 | BCM2835_GPIO_PIN(3), | |
106 | BCM2835_GPIO_PIN(4), | |
107 | BCM2835_GPIO_PIN(5), | |
108 | BCM2835_GPIO_PIN(6), | |
109 | BCM2835_GPIO_PIN(7), | |
110 | BCM2835_GPIO_PIN(8), | |
111 | BCM2835_GPIO_PIN(9), | |
112 | BCM2835_GPIO_PIN(10), | |
113 | BCM2835_GPIO_PIN(11), | |
114 | BCM2835_GPIO_PIN(12), | |
115 | BCM2835_GPIO_PIN(13), | |
116 | BCM2835_GPIO_PIN(14), | |
117 | BCM2835_GPIO_PIN(15), | |
118 | BCM2835_GPIO_PIN(16), | |
119 | BCM2835_GPIO_PIN(17), | |
120 | BCM2835_GPIO_PIN(18), | |
121 | BCM2835_GPIO_PIN(19), | |
122 | BCM2835_GPIO_PIN(20), | |
123 | BCM2835_GPIO_PIN(21), | |
124 | BCM2835_GPIO_PIN(22), | |
125 | BCM2835_GPIO_PIN(23), | |
126 | BCM2835_GPIO_PIN(24), | |
127 | BCM2835_GPIO_PIN(25), | |
128 | BCM2835_GPIO_PIN(26), | |
129 | BCM2835_GPIO_PIN(27), | |
130 | BCM2835_GPIO_PIN(28), | |
131 | BCM2835_GPIO_PIN(29), | |
132 | BCM2835_GPIO_PIN(30), | |
133 | BCM2835_GPIO_PIN(31), | |
134 | BCM2835_GPIO_PIN(32), | |
135 | BCM2835_GPIO_PIN(33), | |
136 | BCM2835_GPIO_PIN(34), | |
137 | BCM2835_GPIO_PIN(35), | |
138 | BCM2835_GPIO_PIN(36), | |
139 | BCM2835_GPIO_PIN(37), | |
140 | BCM2835_GPIO_PIN(38), | |
141 | BCM2835_GPIO_PIN(39), | |
142 | BCM2835_GPIO_PIN(40), | |
143 | BCM2835_GPIO_PIN(41), | |
144 | BCM2835_GPIO_PIN(42), | |
145 | BCM2835_GPIO_PIN(43), | |
146 | BCM2835_GPIO_PIN(44), | |
147 | BCM2835_GPIO_PIN(45), | |
148 | BCM2835_GPIO_PIN(46), | |
149 | BCM2835_GPIO_PIN(47), | |
150 | BCM2835_GPIO_PIN(48), | |
151 | BCM2835_GPIO_PIN(49), | |
152 | BCM2835_GPIO_PIN(50), | |
153 | BCM2835_GPIO_PIN(51), | |
154 | BCM2835_GPIO_PIN(52), | |
155 | BCM2835_GPIO_PIN(53), | |
156 | }; | |
157 | ||
158 | /* one pin per group */ | |
159 | static const char * const bcm2835_gpio_groups[] = { | |
160 | "gpio0", | |
161 | "gpio1", | |
162 | "gpio2", | |
163 | "gpio3", | |
164 | "gpio4", | |
165 | "gpio5", | |
166 | "gpio6", | |
167 | "gpio7", | |
168 | "gpio8", | |
169 | "gpio9", | |
170 | "gpio10", | |
171 | "gpio11", | |
172 | "gpio12", | |
173 | "gpio13", | |
174 | "gpio14", | |
175 | "gpio15", | |
176 | "gpio16", | |
177 | "gpio17", | |
178 | "gpio18", | |
179 | "gpio19", | |
180 | "gpio20", | |
181 | "gpio21", | |
182 | "gpio22", | |
183 | "gpio23", | |
184 | "gpio24", | |
185 | "gpio25", | |
186 | "gpio26", | |
187 | "gpio27", | |
188 | "gpio28", | |
189 | "gpio29", | |
190 | "gpio30", | |
191 | "gpio31", | |
192 | "gpio32", | |
193 | "gpio33", | |
194 | "gpio34", | |
195 | "gpio35", | |
196 | "gpio36", | |
197 | "gpio37", | |
198 | "gpio38", | |
199 | "gpio39", | |
200 | "gpio40", | |
201 | "gpio41", | |
202 | "gpio42", | |
203 | "gpio43", | |
204 | "gpio44", | |
205 | "gpio45", | |
206 | "gpio46", | |
207 | "gpio47", | |
208 | "gpio48", | |
209 | "gpio49", | |
210 | "gpio50", | |
211 | "gpio51", | |
212 | "gpio52", | |
213 | "gpio53", | |
214 | }; | |
215 | ||
216 | enum bcm2835_fsel { | |
217 | BCM2835_FSEL_GPIO_IN = 0, | |
218 | BCM2835_FSEL_GPIO_OUT = 1, | |
219 | BCM2835_FSEL_ALT0 = 4, | |
220 | BCM2835_FSEL_ALT1 = 5, | |
221 | BCM2835_FSEL_ALT2 = 6, | |
222 | BCM2835_FSEL_ALT3 = 7, | |
223 | BCM2835_FSEL_ALT4 = 3, | |
224 | BCM2835_FSEL_ALT5 = 2, | |
225 | BCM2835_FSEL_COUNT = 8, | |
226 | BCM2835_FSEL_MASK = 0x7, | |
227 | }; | |
228 | ||
229 | static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = { | |
230 | [BCM2835_FSEL_GPIO_IN] = "gpio_in", | |
231 | [BCM2835_FSEL_GPIO_OUT] = "gpio_out", | |
232 | [BCM2835_FSEL_ALT0] = "alt0", | |
233 | [BCM2835_FSEL_ALT1] = "alt1", | |
234 | [BCM2835_FSEL_ALT2] = "alt2", | |
235 | [BCM2835_FSEL_ALT3] = "alt3", | |
236 | [BCM2835_FSEL_ALT4] = "alt4", | |
237 | [BCM2835_FSEL_ALT5] = "alt5", | |
238 | }; | |
239 | ||
240 | static const char * const irq_type_names[] = { | |
241 | [IRQ_TYPE_NONE] = "none", | |
242 | [IRQ_TYPE_EDGE_RISING] = "edge-rising", | |
243 | [IRQ_TYPE_EDGE_FALLING] = "edge-falling", | |
244 | [IRQ_TYPE_EDGE_BOTH] = "edge-both", | |
245 | [IRQ_TYPE_LEVEL_HIGH] = "level-high", | |
246 | [IRQ_TYPE_LEVEL_LOW] = "level-low", | |
247 | }; | |
248 | ||
249 | static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg) | |
250 | { | |
251 | return readl(pc->base + reg); | |
252 | } | |
253 | ||
254 | static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg, | |
255 | u32 val) | |
256 | { | |
257 | writel(val, pc->base + reg); | |
258 | } | |
259 | ||
260 | static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg, | |
261 | unsigned bit) | |
262 | { | |
263 | reg += GPIO_REG_OFFSET(bit) * 4; | |
264 | return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1; | |
265 | } | |
266 | ||
267 | /* note NOT a read/modify/write cycle */ | |
268 | static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc, | |
269 | unsigned reg, unsigned bit) | |
270 | { | |
271 | reg += GPIO_REG_OFFSET(bit) * 4; | |
272 | bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit))); | |
273 | } | |
274 | ||
275 | static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get( | |
276 | struct bcm2835_pinctrl *pc, unsigned pin) | |
277 | { | |
278 | u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin)); | |
279 | enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK; | |
280 | ||
281 | dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin, | |
282 | bcm2835_functions[status]); | |
283 | ||
284 | return status; | |
285 | } | |
286 | ||
287 | static inline void bcm2835_pinctrl_fsel_set( | |
288 | struct bcm2835_pinctrl *pc, unsigned pin, | |
289 | enum bcm2835_fsel fsel) | |
290 | { | |
291 | u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin)); | |
292 | enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK; | |
293 | ||
294 | dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin, | |
295 | bcm2835_functions[cur]); | |
296 | ||
297 | if (cur == fsel) | |
298 | return; | |
299 | ||
300 | if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) { | |
301 | /* always transition through GPIO_IN */ | |
302 | val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin)); | |
303 | val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin); | |
304 | ||
305 | dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin, | |
306 | bcm2835_functions[BCM2835_FSEL_GPIO_IN]); | |
307 | bcm2835_gpio_wr(pc, FSEL_REG(pin), val); | |
308 | } | |
309 | ||
310 | val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin)); | |
311 | val |= fsel << FSEL_SHIFT(pin); | |
312 | ||
313 | dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin, | |
314 | bcm2835_functions[fsel]); | |
315 | bcm2835_gpio_wr(pc, FSEL_REG(pin), val); | |
316 | } | |
317 | ||
e1b2dc70 SA |
318 | static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
319 | { | |
320 | return pinctrl_gpio_direction_input(chip->base + offset); | |
321 | } | |
322 | ||
323 | static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset) | |
324 | { | |
e19a5f79 | 325 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); |
e1b2dc70 SA |
326 | |
327 | return bcm2835_gpio_get_bit(pc, GPLEV0, offset); | |
328 | } | |
329 | ||
20b3d2a7 SW |
330 | static int bcm2835_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) |
331 | { | |
332 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
333 | enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset); | |
334 | ||
335 | /* Alternative function doesn't clearly provide a direction */ | |
336 | if (fsel > BCM2835_FSEL_GPIO_OUT) | |
337 | return -EINVAL; | |
338 | ||
339 | return (fsel == BCM2835_FSEL_GPIO_IN); | |
340 | } | |
341 | ||
e1b2dc70 SA |
342 | static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
343 | { | |
e19a5f79 | 344 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); |
e1b2dc70 SA |
345 | |
346 | bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset); | |
347 | } | |
348 | ||
4c02cba1 SW |
349 | static int bcm2835_gpio_direction_output(struct gpio_chip *chip, |
350 | unsigned offset, int value) | |
351 | { | |
352 | bcm2835_gpio_set(chip, offset, value); | |
353 | return pinctrl_gpio_direction_output(chip->base + offset); | |
354 | } | |
355 | ||
84db00ba | 356 | static struct gpio_chip bcm2835_gpio_chip = { |
e1b2dc70 SA |
357 | .label = MODULE_NAME, |
358 | .owner = THIS_MODULE, | |
98c85d58 JG |
359 | .request = gpiochip_generic_request, |
360 | .free = gpiochip_generic_free, | |
e1b2dc70 SA |
361 | .direction_input = bcm2835_gpio_direction_input, |
362 | .direction_output = bcm2835_gpio_direction_output, | |
20b3d2a7 | 363 | .get_direction = bcm2835_gpio_get_direction, |
e1b2dc70 SA |
364 | .get = bcm2835_gpio_get, |
365 | .set = bcm2835_gpio_set, | |
e1b2dc70 SA |
366 | .base = -1, |
367 | .ngpio = BCM2835_NUM_GPIOS, | |
9fb1f39e | 368 | .can_sleep = false, |
e1b2dc70 SA |
369 | }; |
370 | ||
85ae9e51 LW |
371 | static void bcm2835_gpio_irq_handle_bank(struct bcm2835_pinctrl *pc, |
372 | unsigned int bank, u32 mask) | |
e1b2dc70 | 373 | { |
e1b2dc70 SA |
374 | unsigned long events; |
375 | unsigned offset; | |
376 | unsigned gpio; | |
377 | unsigned int type; | |
378 | ||
379 | events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4); | |
00445b5d | 380 | events &= mask; |
e1b2dc70 SA |
381 | events &= pc->enabled_irq_map[bank]; |
382 | for_each_set_bit(offset, &events, 32) { | |
383 | gpio = (32 * bank) + offset; | |
85ae9e51 | 384 | /* FIXME: no clue why the code looks up the type here */ |
e1b2dc70 SA |
385 | type = pc->irq_type[gpio]; |
386 | ||
85ae9e51 LW |
387 | generic_handle_irq(irq_linear_revmap(pc->gpio_chip.irqdomain, |
388 | gpio)); | |
e1b2dc70 | 389 | } |
00445b5d PE |
390 | } |
391 | ||
85ae9e51 | 392 | static void bcm2835_gpio_irq_handler(struct irq_desc *desc) |
00445b5d | 393 | { |
85ae9e51 LW |
394 | struct gpio_chip *chip = irq_desc_get_handler_data(desc); |
395 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
396 | struct irq_chip *host_chip = irq_desc_get_chip(desc); | |
397 | int irq = irq_desc_get_irq(desc); | |
398 | int group; | |
399 | int i; | |
400 | ||
401 | for (i = 0; i < ARRAY_SIZE(pc->irq); i++) { | |
402 | if (pc->irq[i] == irq) { | |
403 | group = pc->irq_group[i]; | |
404 | break; | |
405 | } | |
406 | } | |
407 | /* This should not happen, every IRQ has a bank */ | |
408 | if (i == ARRAY_SIZE(pc->irq)) | |
409 | BUG(); | |
00445b5d | 410 | |
85ae9e51 LW |
411 | chained_irq_enter(host_chip, desc); |
412 | ||
413 | switch (group) { | |
00445b5d | 414 | case 0: /* IRQ0 covers GPIOs 0-27 */ |
85ae9e51 | 415 | bcm2835_gpio_irq_handle_bank(pc, 0, 0x0fffffff); |
00445b5d PE |
416 | break; |
417 | case 1: /* IRQ1 covers GPIOs 28-45 */ | |
85ae9e51 LW |
418 | bcm2835_gpio_irq_handle_bank(pc, 0, 0xf0000000); |
419 | bcm2835_gpio_irq_handle_bank(pc, 1, 0x00003fff); | |
00445b5d PE |
420 | break; |
421 | case 2: /* IRQ2 covers GPIOs 46-53 */ | |
85ae9e51 | 422 | bcm2835_gpio_irq_handle_bank(pc, 1, 0x003fc000); |
00445b5d PE |
423 | break; |
424 | } | |
425 | ||
85ae9e51 | 426 | chained_irq_exit(host_chip, desc); |
e1b2dc70 SA |
427 | } |
428 | ||
429 | static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, | |
430 | unsigned reg, unsigned offset, bool enable) | |
431 | { | |
432 | u32 value; | |
433 | reg += GPIO_REG_OFFSET(offset) * 4; | |
434 | value = bcm2835_gpio_rd(pc, reg); | |
435 | if (enable) | |
436 | value |= BIT(GPIO_REG_SHIFT(offset)); | |
437 | else | |
438 | value &= ~(BIT(GPIO_REG_SHIFT(offset))); | |
439 | bcm2835_gpio_wr(pc, reg, value); | |
440 | } | |
441 | ||
442 | /* fast path for IRQ handler */ | |
443 | static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, | |
444 | unsigned offset, bool enable) | |
445 | { | |
446 | switch (pc->irq_type[offset]) { | |
447 | case IRQ_TYPE_EDGE_RISING: | |
448 | __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable); | |
449 | break; | |
450 | ||
451 | case IRQ_TYPE_EDGE_FALLING: | |
452 | __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable); | |
453 | break; | |
454 | ||
455 | case IRQ_TYPE_EDGE_BOTH: | |
456 | __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable); | |
457 | __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable); | |
458 | break; | |
459 | ||
460 | case IRQ_TYPE_LEVEL_HIGH: | |
461 | __bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable); | |
462 | break; | |
463 | ||
464 | case IRQ_TYPE_LEVEL_LOW: | |
465 | __bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable); | |
466 | break; | |
467 | } | |
468 | } | |
469 | ||
470 | static void bcm2835_gpio_irq_enable(struct irq_data *data) | |
471 | { | |
85ae9e51 LW |
472 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); |
473 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
e1b2dc70 SA |
474 | unsigned gpio = irqd_to_hwirq(data); |
475 | unsigned offset = GPIO_REG_SHIFT(gpio); | |
476 | unsigned bank = GPIO_REG_OFFSET(gpio); | |
477 | unsigned long flags; | |
478 | ||
479 | spin_lock_irqsave(&pc->irq_lock[bank], flags); | |
480 | set_bit(offset, &pc->enabled_irq_map[bank]); | |
481 | bcm2835_gpio_irq_config(pc, gpio, true); | |
482 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); | |
483 | } | |
484 | ||
485 | static void bcm2835_gpio_irq_disable(struct irq_data *data) | |
486 | { | |
85ae9e51 LW |
487 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); |
488 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
e1b2dc70 SA |
489 | unsigned gpio = irqd_to_hwirq(data); |
490 | unsigned offset = GPIO_REG_SHIFT(gpio); | |
491 | unsigned bank = GPIO_REG_OFFSET(gpio); | |
492 | unsigned long flags; | |
493 | ||
494 | spin_lock_irqsave(&pc->irq_lock[bank], flags); | |
495 | bcm2835_gpio_irq_config(pc, gpio, false); | |
714b1dd8 JB |
496 | /* Clear events that were latched prior to clearing event sources */ |
497 | bcm2835_gpio_set_bit(pc, GPEDS0, gpio); | |
e1b2dc70 SA |
498 | clear_bit(offset, &pc->enabled_irq_map[bank]); |
499 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); | |
500 | } | |
501 | ||
502 | static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc, | |
503 | unsigned offset, unsigned int type) | |
504 | { | |
505 | switch (type) { | |
506 | case IRQ_TYPE_NONE: | |
507 | case IRQ_TYPE_EDGE_RISING: | |
508 | case IRQ_TYPE_EDGE_FALLING: | |
509 | case IRQ_TYPE_EDGE_BOTH: | |
510 | case IRQ_TYPE_LEVEL_HIGH: | |
511 | case IRQ_TYPE_LEVEL_LOW: | |
512 | pc->irq_type[offset] = type; | |
513 | break; | |
514 | ||
515 | default: | |
516 | return -EINVAL; | |
517 | } | |
518 | return 0; | |
519 | } | |
520 | ||
521 | /* slower path for reconfiguring IRQ type */ | |
522 | static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc, | |
523 | unsigned offset, unsigned int type) | |
524 | { | |
525 | switch (type) { | |
526 | case IRQ_TYPE_NONE: | |
527 | if (pc->irq_type[offset] != type) { | |
528 | bcm2835_gpio_irq_config(pc, offset, false); | |
529 | pc->irq_type[offset] = type; | |
530 | } | |
531 | break; | |
532 | ||
533 | case IRQ_TYPE_EDGE_RISING: | |
534 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) { | |
535 | /* RISING already enabled, disable FALLING */ | |
536 | pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING; | |
537 | bcm2835_gpio_irq_config(pc, offset, false); | |
538 | pc->irq_type[offset] = type; | |
539 | } else if (pc->irq_type[offset] != type) { | |
540 | bcm2835_gpio_irq_config(pc, offset, false); | |
541 | pc->irq_type[offset] = type; | |
542 | bcm2835_gpio_irq_config(pc, offset, true); | |
543 | } | |
544 | break; | |
545 | ||
546 | case IRQ_TYPE_EDGE_FALLING: | |
547 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) { | |
548 | /* FALLING already enabled, disable RISING */ | |
549 | pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING; | |
550 | bcm2835_gpio_irq_config(pc, offset, false); | |
551 | pc->irq_type[offset] = type; | |
552 | } else if (pc->irq_type[offset] != type) { | |
553 | bcm2835_gpio_irq_config(pc, offset, false); | |
554 | pc->irq_type[offset] = type; | |
555 | bcm2835_gpio_irq_config(pc, offset, true); | |
556 | } | |
557 | break; | |
558 | ||
559 | case IRQ_TYPE_EDGE_BOTH: | |
560 | if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) { | |
561 | /* RISING already enabled, enable FALLING too */ | |
562 | pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING; | |
563 | bcm2835_gpio_irq_config(pc, offset, true); | |
564 | pc->irq_type[offset] = type; | |
565 | } else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) { | |
566 | /* FALLING already enabled, enable RISING too */ | |
567 | pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING; | |
568 | bcm2835_gpio_irq_config(pc, offset, true); | |
569 | pc->irq_type[offset] = type; | |
570 | } else if (pc->irq_type[offset] != type) { | |
571 | bcm2835_gpio_irq_config(pc, offset, false); | |
572 | pc->irq_type[offset] = type; | |
573 | bcm2835_gpio_irq_config(pc, offset, true); | |
574 | } | |
575 | break; | |
576 | ||
577 | case IRQ_TYPE_LEVEL_HIGH: | |
578 | case IRQ_TYPE_LEVEL_LOW: | |
579 | if (pc->irq_type[offset] != type) { | |
580 | bcm2835_gpio_irq_config(pc, offset, false); | |
581 | pc->irq_type[offset] = type; | |
582 | bcm2835_gpio_irq_config(pc, offset, true); | |
583 | } | |
584 | break; | |
585 | ||
586 | default: | |
587 | return -EINVAL; | |
588 | } | |
589 | return 0; | |
590 | } | |
591 | ||
592 | static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type) | |
593 | { | |
85ae9e51 LW |
594 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); |
595 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
e1b2dc70 SA |
596 | unsigned gpio = irqd_to_hwirq(data); |
597 | unsigned offset = GPIO_REG_SHIFT(gpio); | |
598 | unsigned bank = GPIO_REG_OFFSET(gpio); | |
599 | unsigned long flags; | |
600 | int ret; | |
601 | ||
602 | spin_lock_irqsave(&pc->irq_lock[bank], flags); | |
603 | ||
604 | if (test_bit(offset, &pc->enabled_irq_map[bank])) | |
605 | ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type); | |
606 | else | |
607 | ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type); | |
608 | ||
b8a19382 | 609 | if (type & IRQ_TYPE_EDGE_BOTH) |
1aa74fd0 | 610 | irq_set_handler_locked(data, handle_edge_irq); |
b8a19382 | 611 | else |
1aa74fd0 | 612 | irq_set_handler_locked(data, handle_level_irq); |
b8a19382 | 613 | |
e1b2dc70 SA |
614 | spin_unlock_irqrestore(&pc->irq_lock[bank], flags); |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
b8a19382 CK |
619 | static void bcm2835_gpio_irq_ack(struct irq_data *data) |
620 | { | |
85ae9e51 LW |
621 | struct gpio_chip *chip = irq_data_get_irq_chip_data(data); |
622 | struct bcm2835_pinctrl *pc = gpiochip_get_data(chip); | |
b8a19382 CK |
623 | unsigned gpio = irqd_to_hwirq(data); |
624 | ||
625 | bcm2835_gpio_set_bit(pc, GPEDS0, gpio); | |
626 | } | |
627 | ||
e1b2dc70 SA |
628 | static struct irq_chip bcm2835_gpio_irq_chip = { |
629 | .name = MODULE_NAME, | |
630 | .irq_enable = bcm2835_gpio_irq_enable, | |
631 | .irq_disable = bcm2835_gpio_irq_disable, | |
632 | .irq_set_type = bcm2835_gpio_irq_set_type, | |
b8a19382 CK |
633 | .irq_ack = bcm2835_gpio_irq_ack, |
634 | .irq_mask = bcm2835_gpio_irq_disable, | |
635 | .irq_unmask = bcm2835_gpio_irq_enable, | |
e1b2dc70 SA |
636 | }; |
637 | ||
638 | static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev) | |
639 | { | |
640 | return ARRAY_SIZE(bcm2835_gpio_groups); | |
641 | } | |
642 | ||
643 | static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev, | |
644 | unsigned selector) | |
645 | { | |
646 | return bcm2835_gpio_groups[selector]; | |
647 | } | |
648 | ||
649 | static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev, | |
650 | unsigned selector, | |
651 | const unsigned **pins, | |
652 | unsigned *num_pins) | |
653 | { | |
654 | *pins = &bcm2835_gpio_pins[selector].number; | |
655 | *num_pins = 1; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev, | |
661 | struct seq_file *s, | |
662 | unsigned offset) | |
663 | { | |
664 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
85ae9e51 | 665 | struct gpio_chip *chip = &pc->gpio_chip; |
e1b2dc70 SA |
666 | enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset); |
667 | const char *fname = bcm2835_functions[fsel]; | |
668 | int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset); | |
85ae9e51 | 669 | int irq = irq_find_mapping(chip->irqdomain, offset); |
e1b2dc70 SA |
670 | |
671 | seq_printf(s, "function %s in %s; irq %d (%s)", | |
672 | fname, value ? "hi" : "lo", | |
673 | irq, irq_type_names[pc->irq_type[offset]]); | |
674 | } | |
675 | ||
676 | static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev, | |
677 | struct pinctrl_map *maps, unsigned num_maps) | |
678 | { | |
679 | int i; | |
680 | ||
681 | for (i = 0; i < num_maps; i++) | |
682 | if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN) | |
683 | kfree(maps[i].data.configs.configs); | |
684 | ||
685 | kfree(maps); | |
686 | } | |
687 | ||
688 | static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc, | |
689 | struct device_node *np, u32 pin, u32 fnum, | |
690 | struct pinctrl_map **maps) | |
691 | { | |
692 | struct pinctrl_map *map = *maps; | |
693 | ||
694 | if (fnum >= ARRAY_SIZE(bcm2835_functions)) { | |
695 | dev_err(pc->dev, "%s: invalid brcm,function %d\n", | |
696 | of_node_full_name(np), fnum); | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
700 | map->type = PIN_MAP_TYPE_MUX_GROUP; | |
701 | map->data.mux.group = bcm2835_gpio_groups[pin]; | |
702 | map->data.mux.function = bcm2835_functions[fnum]; | |
703 | (*maps)++; | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
708 | static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc, | |
709 | struct device_node *np, u32 pin, u32 pull, | |
710 | struct pinctrl_map **maps) | |
711 | { | |
712 | struct pinctrl_map *map = *maps; | |
713 | unsigned long *configs; | |
714 | ||
715 | if (pull > 2) { | |
716 | dev_err(pc->dev, "%s: invalid brcm,pull %d\n", | |
717 | of_node_full_name(np), pull); | |
718 | return -EINVAL; | |
719 | } | |
720 | ||
721 | configs = kzalloc(sizeof(*configs), GFP_KERNEL); | |
722 | if (!configs) | |
723 | return -ENOMEM; | |
724 | configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull); | |
725 | ||
726 | map->type = PIN_MAP_TYPE_CONFIGS_PIN; | |
727 | map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name; | |
728 | map->data.configs.configs = configs; | |
729 | map->data.configs.num_configs = 1; | |
730 | (*maps)++; | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
e1b2dc70 SA |
735 | static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, |
736 | struct device_node *np, | |
737 | struct pinctrl_map **map, unsigned *num_maps) | |
738 | { | |
739 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
740 | struct property *pins, *funcs, *pulls; | |
741 | int num_pins, num_funcs, num_pulls, maps_per_pin; | |
742 | struct pinctrl_map *maps, *cur_map; | |
743 | int i, err; | |
744 | u32 pin, func, pull; | |
745 | ||
746 | pins = of_find_property(np, "brcm,pins", NULL); | |
747 | if (!pins) { | |
748 | dev_err(pc->dev, "%s: missing brcm,pins property\n", | |
749 | of_node_full_name(np)); | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | funcs = of_find_property(np, "brcm,function", NULL); | |
754 | pulls = of_find_property(np, "brcm,pull", NULL); | |
755 | ||
756 | if (!funcs && !pulls) { | |
757 | dev_err(pc->dev, | |
758 | "%s: neither brcm,function nor brcm,pull specified\n", | |
759 | of_node_full_name(np)); | |
760 | return -EINVAL; | |
761 | } | |
762 | ||
763 | num_pins = pins->length / 4; | |
764 | num_funcs = funcs ? (funcs->length / 4) : 0; | |
765 | num_pulls = pulls ? (pulls->length / 4) : 0; | |
766 | ||
767 | if (num_funcs > 1 && num_funcs != num_pins) { | |
768 | dev_err(pc->dev, | |
769 | "%s: brcm,function must have 1 or %d entries\n", | |
770 | of_node_full_name(np), num_pins); | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | if (num_pulls > 1 && num_pulls != num_pins) { | |
775 | dev_err(pc->dev, | |
776 | "%s: brcm,pull must have 1 or %d entries\n", | |
777 | of_node_full_name(np), num_pins); | |
778 | return -EINVAL; | |
779 | } | |
780 | ||
781 | maps_per_pin = 0; | |
782 | if (num_funcs) | |
783 | maps_per_pin++; | |
784 | if (num_pulls) | |
785 | maps_per_pin++; | |
786 | cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps), | |
787 | GFP_KERNEL); | |
788 | if (!maps) | |
789 | return -ENOMEM; | |
790 | ||
791 | for (i = 0; i < num_pins; i++) { | |
ce63d6d4 SW |
792 | err = of_property_read_u32_index(np, "brcm,pins", i, &pin); |
793 | if (err) | |
794 | goto out; | |
e1b2dc70 SA |
795 | if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) { |
796 | dev_err(pc->dev, "%s: invalid brcm,pins value %d\n", | |
797 | of_node_full_name(np), pin); | |
798 | err = -EINVAL; | |
799 | goto out; | |
800 | } | |
801 | ||
802 | if (num_funcs) { | |
ce63d6d4 SW |
803 | err = of_property_read_u32_index(np, "brcm,function", |
804 | (num_funcs > 1) ? i : 0, &func); | |
805 | if (err) | |
806 | goto out; | |
e1b2dc70 SA |
807 | err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin, |
808 | func, &cur_map); | |
809 | if (err) | |
810 | goto out; | |
811 | } | |
812 | if (num_pulls) { | |
ce63d6d4 | 813 | err = of_property_read_u32_index(np, "brcm,pull", |
2c7e3306 | 814 | (num_pulls > 1) ? i : 0, &pull); |
ce63d6d4 SW |
815 | if (err) |
816 | goto out; | |
e1b2dc70 SA |
817 | err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin, |
818 | pull, &cur_map); | |
819 | if (err) | |
820 | goto out; | |
821 | } | |
822 | } | |
823 | ||
824 | *map = maps; | |
825 | *num_maps = num_pins * maps_per_pin; | |
826 | ||
827 | return 0; | |
828 | ||
829 | out: | |
53653c6b | 830 | bcm2835_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin); |
e1b2dc70 SA |
831 | return err; |
832 | } | |
833 | ||
022ab148 | 834 | static const struct pinctrl_ops bcm2835_pctl_ops = { |
e1b2dc70 SA |
835 | .get_groups_count = bcm2835_pctl_get_groups_count, |
836 | .get_group_name = bcm2835_pctl_get_group_name, | |
837 | .get_group_pins = bcm2835_pctl_get_group_pins, | |
838 | .pin_dbg_show = bcm2835_pctl_pin_dbg_show, | |
839 | .dt_node_to_map = bcm2835_pctl_dt_node_to_map, | |
840 | .dt_free_map = bcm2835_pctl_dt_free_map, | |
841 | }; | |
842 | ||
ccca1ad5 PE |
843 | static int bcm2835_pmx_free(struct pinctrl_dev *pctldev, |
844 | unsigned offset) | |
845 | { | |
846 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
847 | ||
848 | /* disable by setting to GPIO_IN */ | |
849 | bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN); | |
850 | return 0; | |
851 | } | |
852 | ||
e1b2dc70 SA |
853 | static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev) |
854 | { | |
855 | return BCM2835_FSEL_COUNT; | |
856 | } | |
857 | ||
858 | static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev, | |
859 | unsigned selector) | |
860 | { | |
861 | return bcm2835_functions[selector]; | |
862 | } | |
863 | ||
864 | static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev, | |
865 | unsigned selector, | |
866 | const char * const **groups, | |
867 | unsigned * const num_groups) | |
868 | { | |
869 | /* every pin can do every function */ | |
870 | *groups = bcm2835_gpio_groups; | |
871 | *num_groups = ARRAY_SIZE(bcm2835_gpio_groups); | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
03e9f0ca | 876 | static int bcm2835_pmx_set(struct pinctrl_dev *pctldev, |
e1b2dc70 SA |
877 | unsigned func_selector, |
878 | unsigned group_selector) | |
879 | { | |
880 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
881 | ||
882 | bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector); | |
883 | ||
884 | return 0; | |
885 | } | |
886 | ||
e1b2dc70 SA |
887 | static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, |
888 | struct pinctrl_gpio_range *range, | |
889 | unsigned offset) | |
890 | { | |
891 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
892 | ||
893 | /* disable by setting to GPIO_IN */ | |
894 | bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN); | |
895 | } | |
896 | ||
897 | static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, | |
898 | struct pinctrl_gpio_range *range, | |
899 | unsigned offset, | |
900 | bool input) | |
901 | { | |
902 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
903 | enum bcm2835_fsel fsel = input ? | |
904 | BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT; | |
905 | ||
906 | bcm2835_pinctrl_fsel_set(pc, offset, fsel); | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
022ab148 | 911 | static const struct pinmux_ops bcm2835_pmx_ops = { |
ccca1ad5 | 912 | .free = bcm2835_pmx_free, |
e1b2dc70 SA |
913 | .get_functions_count = bcm2835_pmx_get_functions_count, |
914 | .get_function_name = bcm2835_pmx_get_function_name, | |
915 | .get_function_groups = bcm2835_pmx_get_function_groups, | |
03e9f0ca | 916 | .set_mux = bcm2835_pmx_set, |
e1b2dc70 SA |
917 | .gpio_disable_free = bcm2835_pmx_gpio_disable_free, |
918 | .gpio_set_direction = bcm2835_pmx_gpio_set_direction, | |
919 | }; | |
920 | ||
921 | static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev, | |
922 | unsigned pin, unsigned long *config) | |
923 | { | |
924 | /* No way to read back config in HW */ | |
925 | return -ENOTSUPP; | |
926 | } | |
927 | ||
928 | static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev, | |
03b054e9 SY |
929 | unsigned pin, unsigned long *configs, |
930 | unsigned num_configs) | |
e1b2dc70 SA |
931 | { |
932 | struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); | |
03b054e9 SY |
933 | enum bcm2835_pinconf_param param; |
934 | u16 arg; | |
e1b2dc70 | 935 | u32 off, bit; |
03b054e9 | 936 | int i; |
e1b2dc70 | 937 | |
03b054e9 SY |
938 | for (i = 0; i < num_configs; i++) { |
939 | param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]); | |
940 | arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]); | |
941 | ||
942 | if (param != BCM2835_PINCONF_PARAM_PULL) | |
943 | return -EINVAL; | |
944 | ||
945 | off = GPIO_REG_OFFSET(pin); | |
946 | bit = GPIO_REG_SHIFT(pin); | |
947 | ||
948 | bcm2835_gpio_wr(pc, GPPUD, arg & 3); | |
949 | /* | |
b83bd893 SW |
950 | * BCM2835 datasheet say to wait 150 cycles, but not of what. |
951 | * But the VideoCore firmware delay for this operation | |
952 | * based nearly on the same amount of VPU cycles and this clock | |
953 | * runs at 250 MHz. | |
03b054e9 | 954 | */ |
b83bd893 | 955 | udelay(1); |
03b054e9 | 956 | bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit)); |
b83bd893 | 957 | udelay(1); |
03b054e9 SY |
958 | bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0); |
959 | } /* for each config */ | |
e1b2dc70 SA |
960 | |
961 | return 0; | |
962 | } | |
963 | ||
022ab148 | 964 | static const struct pinconf_ops bcm2835_pinconf_ops = { |
e1b2dc70 SA |
965 | .pin_config_get = bcm2835_pinconf_get, |
966 | .pin_config_set = bcm2835_pinconf_set, | |
967 | }; | |
968 | ||
969 | static struct pinctrl_desc bcm2835_pinctrl_desc = { | |
970 | .name = MODULE_NAME, | |
971 | .pins = bcm2835_gpio_pins, | |
972 | .npins = ARRAY_SIZE(bcm2835_gpio_pins), | |
973 | .pctlops = &bcm2835_pctl_ops, | |
974 | .pmxops = &bcm2835_pmx_ops, | |
975 | .confops = &bcm2835_pinconf_ops, | |
976 | .owner = THIS_MODULE, | |
977 | }; | |
978 | ||
84db00ba | 979 | static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = { |
e1b2dc70 SA |
980 | .name = MODULE_NAME, |
981 | .npins = BCM2835_NUM_GPIOS, | |
982 | }; | |
983 | ||
150632b0 | 984 | static int bcm2835_pinctrl_probe(struct platform_device *pdev) |
e1b2dc70 SA |
985 | { |
986 | struct device *dev = &pdev->dev; | |
987 | struct device_node *np = dev->of_node; | |
988 | struct bcm2835_pinctrl *pc; | |
989 | struct resource iomem; | |
990 | int err, i; | |
991 | BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS); | |
992 | BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS); | |
993 | ||
994 | pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL); | |
995 | if (!pc) | |
996 | return -ENOMEM; | |
997 | ||
998 | platform_set_drvdata(pdev, pc); | |
999 | pc->dev = dev; | |
1000 | ||
1001 | err = of_address_to_resource(np, 0, &iomem); | |
1002 | if (err) { | |
1003 | dev_err(dev, "could not get IO memory\n"); | |
1004 | return err; | |
1005 | } | |
1006 | ||
9e0c1fb2 TR |
1007 | pc->base = devm_ioremap_resource(dev, &iomem); |
1008 | if (IS_ERR(pc->base)) | |
1009 | return PTR_ERR(pc->base); | |
e1b2dc70 SA |
1010 | |
1011 | pc->gpio_chip = bcm2835_gpio_chip; | |
58383c78 | 1012 | pc->gpio_chip.parent = dev; |
e1b2dc70 SA |
1013 | pc->gpio_chip.of_node = np; |
1014 | ||
e1b2dc70 SA |
1015 | for (i = 0; i < BCM2835_NUM_BANKS; i++) { |
1016 | unsigned long events; | |
1017 | unsigned offset; | |
e1b2dc70 SA |
1018 | |
1019 | /* clear event detection flags */ | |
1020 | bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0); | |
1021 | bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0); | |
1022 | bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0); | |
1023 | bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0); | |
1024 | bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0); | |
1025 | bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0); | |
1026 | ||
1027 | /* clear all the events */ | |
1028 | events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4); | |
1029 | for_each_set_bit(offset, &events, 32) | |
1030 | bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset)); | |
1031 | ||
00445b5d PE |
1032 | spin_lock_init(&pc->irq_lock[i]); |
1033 | } | |
1034 | ||
e19a5f79 | 1035 | err = gpiochip_add_data(&pc->gpio_chip, pc); |
e1b2dc70 SA |
1036 | if (err) { |
1037 | dev_err(dev, "could not add GPIO chip\n"); | |
1038 | return err; | |
1039 | } | |
1040 | ||
85ae9e51 LW |
1041 | err = gpiochip_irqchip_add(&pc->gpio_chip, &bcm2835_gpio_irq_chip, |
1042 | 0, handle_level_irq, IRQ_TYPE_NONE); | |
1043 | if (err) { | |
1044 | dev_info(dev, "could not add irqchip\n"); | |
1045 | return err; | |
1046 | } | |
1047 | ||
1048 | for (i = 0; i < BCM2835_NUM_IRQS; i++) { | |
1049 | pc->irq[i] = irq_of_parse_and_map(np, i); | |
1050 | pc->irq_group[i] = i; | |
1051 | /* | |
1052 | * Use the same handler for all groups: this is necessary | |
1053 | * since we use one gpiochip to cover all lines - the | |
1054 | * irq handler then needs to figure out which group and | |
1055 | * bank that was firing the IRQ and look up the per-group | |
1056 | * and bank data. | |
1057 | */ | |
1058 | gpiochip_set_chained_irqchip(&pc->gpio_chip, | |
1059 | &bcm2835_gpio_irq_chip, | |
1060 | pc->irq[i], | |
1061 | bcm2835_gpio_irq_handler); | |
1062 | } | |
1063 | ||
5f276f67 | 1064 | pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc); |
323de9ef | 1065 | if (IS_ERR(pc->pctl_dev)) { |
e1b2dc70 | 1066 | gpiochip_remove(&pc->gpio_chip); |
323de9ef | 1067 | return PTR_ERR(pc->pctl_dev); |
e1b2dc70 SA |
1068 | } |
1069 | ||
1070 | pc->gpio_range = bcm2835_pinctrl_gpio_range; | |
1071 | pc->gpio_range.base = pc->gpio_chip.base; | |
1072 | pc->gpio_range.gc = &pc->gpio_chip; | |
1073 | pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range); | |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
f90f54b3 | 1078 | static int bcm2835_pinctrl_remove(struct platform_device *pdev) |
e1b2dc70 SA |
1079 | { |
1080 | struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev); | |
1081 | ||
e1b2dc70 SA |
1082 | gpiochip_remove(&pc->gpio_chip); |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
baa9946e | 1087 | static const struct of_device_id bcm2835_pinctrl_match[] = { |
e1b2dc70 SA |
1088 | { .compatible = "brcm,bcm2835-gpio" }, |
1089 | {} | |
1090 | }; | |
1091 | MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match); | |
1092 | ||
1093 | static struct platform_driver bcm2835_pinctrl_driver = { | |
1094 | .probe = bcm2835_pinctrl_probe, | |
1095 | .remove = bcm2835_pinctrl_remove, | |
1096 | .driver = { | |
1097 | .name = MODULE_NAME, | |
e1b2dc70 SA |
1098 | .of_match_table = bcm2835_pinctrl_match, |
1099 | }, | |
1100 | }; | |
1101 | module_platform_driver(bcm2835_pinctrl_driver); | |
1102 | ||
1103 | MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren"); | |
1104 | MODULE_DESCRIPTION("BCM2835 Pin control driver"); | |
1105 | MODULE_LICENSE("GPL"); |