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