diff options
author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
---|---|---|
committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/gpio/gpio-u300.c | |
parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) |
Diffstat (limited to 'drivers/gpio/gpio-u300.c')
-rw-r--r-- | drivers/gpio/gpio-u300.c | 697 |
1 files changed, 697 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-u300.c b/drivers/gpio/gpio-u300.c new file mode 100644 index 00000000000..53e8255cb0b --- /dev/null +++ b/drivers/gpio/gpio-u300.c | |||
@@ -0,0 +1,697 @@ | |||
1 | /* | ||
2 | * U300 GPIO module. | ||
3 | * | ||
4 | * Copyright (C) 2007-2009 ST-Ericsson AB | ||
5 | * License terms: GNU General Public License (GPL) version 2 | ||
6 | * This can driver either of the two basic GPIO cores | ||
7 | * available in the U300 platforms: | ||
8 | * COH 901 335 - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0) | ||
9 | * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0) | ||
10 | * Notice that you also have inline macros in <asm-arch/gpio.h> | ||
11 | * Author: Linus Walleij <linus.walleij@stericsson.com> | ||
12 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> | ||
13 | * | ||
14 | */ | ||
15 | #include <linux/module.h> | ||
16 | #include <linux/interrupt.h> | ||
17 | #include <linux/delay.h> | ||
18 | #include <linux/errno.h> | ||
19 | #include <linux/io.h> | ||
20 | #include <linux/clk.h> | ||
21 | #include <linux/err.h> | ||
22 | #include <linux/platform_device.h> | ||
23 | #include <linux/gpio.h> | ||
24 | |||
25 | /* Reference to GPIO block clock */ | ||
26 | static struct clk *clk; | ||
27 | |||
28 | /* Memory resource */ | ||
29 | static struct resource *memres; | ||
30 | static void __iomem *virtbase; | ||
31 | static struct device *gpiodev; | ||
32 | |||
33 | struct u300_gpio_port { | ||
34 | const char *name; | ||
35 | int irq; | ||
36 | int number; | ||
37 | }; | ||
38 | |||
39 | |||
40 | static struct u300_gpio_port gpio_ports[] = { | ||
41 | { | ||
42 | .name = "gpio0", | ||
43 | .number = 0, | ||
44 | }, | ||
45 | { | ||
46 | .name = "gpio1", | ||
47 | .number = 1, | ||
48 | }, | ||
49 | { | ||
50 | .name = "gpio2", | ||
51 | .number = 2, | ||
52 | }, | ||
53 | #ifdef U300_COH901571_3 | ||
54 | { | ||
55 | .name = "gpio3", | ||
56 | .number = 3, | ||
57 | }, | ||
58 | { | ||
59 | .name = "gpio4", | ||
60 | .number = 4, | ||
61 | }, | ||
62 | #ifdef CONFIG_MACH_U300_BS335 | ||
63 | { | ||
64 | .name = "gpio5", | ||
65 | .number = 5, | ||
66 | }, | ||
67 | { | ||
68 | .name = "gpio6", | ||
69 | .number = 6, | ||
70 | }, | ||
71 | #endif | ||
72 | #endif | ||
73 | |||
74 | }; | ||
75 | |||
76 | |||
77 | #ifdef U300_COH901571_3 | ||
78 | |||
79 | /* Default input value */ | ||
80 | #define DEFAULT_OUTPUT_LOW 0 | ||
81 | #define DEFAULT_OUTPUT_HIGH 1 | ||
82 | |||
83 | /* GPIO Pull-Up status */ | ||
84 | #define DISABLE_PULL_UP 0 | ||
85 | #define ENABLE_PULL_UP 1 | ||
86 | |||
87 | #define GPIO_NOT_USED 0 | ||
88 | #define GPIO_IN 1 | ||
89 | #define GPIO_OUT 2 | ||
90 | |||
91 | struct u300_gpio_configuration_data { | ||
92 | unsigned char pin_usage; | ||
93 | unsigned char default_output_value; | ||
94 | unsigned char pull_up; | ||
95 | }; | ||
96 | |||
97 | /* Initial configuration */ | ||
98 | const struct u300_gpio_configuration_data | ||
99 | u300_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = { | ||
100 | #ifdef CONFIG_MACH_U300_BS335 | ||
101 | /* Port 0, pins 0-7 */ | ||
102 | { | ||
103 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
104 | {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP}, | ||
105 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
106 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
107 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
108 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
109 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
110 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
111 | }, | ||
112 | /* Port 1, pins 0-7 */ | ||
113 | { | ||
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_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
118 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
119 | {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP}, | ||
120 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
121 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
122 | }, | ||
123 | /* Port 2, pins 0-7 */ | ||
124 | { | ||
125 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
126 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
127 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
128 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
129 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
130 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
131 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
132 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} | ||
133 | }, | ||
134 | /* Port 3, pins 0-7 */ | ||
135 | { | ||
136 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
137 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
138 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
139 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
140 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
141 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
142 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
143 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
144 | }, | ||
145 | /* Port 4, pins 0-7 */ | ||
146 | { | ||
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 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
152 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
153 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
154 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
155 | }, | ||
156 | /* Port 5, pins 0-7 */ | ||
157 | { | ||
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 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
163 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
164 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
165 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
166 | }, | ||
167 | /* Port 6, pind 0-7 */ | ||
168 | { | ||
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 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
174 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
175 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
176 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
177 | } | ||
178 | #endif | ||
179 | |||
180 | #ifdef CONFIG_MACH_U300_BS365 | ||
181 | /* Port 0, pins 0-7 */ | ||
182 | { | ||
183 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
184 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
185 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
186 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
187 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
188 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
189 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
190 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
191 | }, | ||
192 | /* Port 1, pins 0-7 */ | ||
193 | { | ||
194 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
195 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
196 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
197 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
198 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
199 | {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP}, | ||
200 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
201 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP} | ||
202 | }, | ||
203 | /* Port 2, pins 0-7 */ | ||
204 | { | ||
205 | {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
206 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
207 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
208 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}, | ||
209 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
210 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
211 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
212 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} | ||
213 | }, | ||
214 | /* Port 3, pins 0-7 */ | ||
215 | { | ||
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 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
221 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
222 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
223 | {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} | ||
224 | }, | ||
225 | /* Port 4, pins 0-7 */ | ||
226 | { | ||
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 | /* These 4 pins doesn't exist on DB3210 */ | ||
232 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
233 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
234 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}, | ||
235 | {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP} | ||
236 | } | ||
237 | #endif | ||
238 | }; | ||
239 | #endif | ||
240 | |||
241 | |||
242 | /* No users == we can power down GPIO */ | ||
243 | static int gpio_users; | ||
244 | |||
245 | struct gpio_struct { | ||
246 | int (*callback)(void *); | ||
247 | void *data; | ||
248 | int users; | ||
249 | }; | ||
250 | |||
251 | static struct gpio_struct gpio_pin[U300_GPIO_MAX]; | ||
252 | |||
253 | /* | ||
254 | * Let drivers register callback in order to get notified when there is | ||
255 | * an interrupt on the gpio pin | ||
256 | */ | ||
257 | int gpio_register_callback(unsigned gpio, int (*func)(void *arg), void *data) | ||
258 | { | ||
259 | if (gpio_pin[gpio].callback) | ||
260 | dev_warn(gpiodev, "%s: WARNING: callback already " | ||
261 | "registered for gpio pin#%d\n", __func__, gpio); | ||
262 | gpio_pin[gpio].callback = func; | ||
263 | gpio_pin[gpio].data = data; | ||
264 | |||
265 | return 0; | ||
266 | } | ||
267 | EXPORT_SYMBOL(gpio_register_callback); | ||
268 | |||
269 | int gpio_unregister_callback(unsigned gpio) | ||
270 | { | ||
271 | if (!gpio_pin[gpio].callback) | ||
272 | dev_warn(gpiodev, "%s: WARNING: callback already " | ||
273 | "unregistered for gpio pin#%d\n", __func__, gpio); | ||
274 | gpio_pin[gpio].callback = NULL; | ||
275 | gpio_pin[gpio].data = NULL; | ||
276 | |||
277 | return 0; | ||
278 | } | ||
279 | EXPORT_SYMBOL(gpio_unregister_callback); | ||
280 | |||
281 | /* Non-zero means valid */ | ||
282 | int gpio_is_valid(int number) | ||
283 | { | ||
284 | if (number >= 0 && | ||
285 | number < (U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT)) | ||
286 | return 1; | ||
287 | return 0; | ||
288 | } | ||
289 | EXPORT_SYMBOL(gpio_is_valid); | ||
290 | |||
291 | int gpio_request(unsigned gpio, const char *label) | ||
292 | { | ||
293 | if (gpio_pin[gpio].users) | ||
294 | return -EINVAL; | ||
295 | else | ||
296 | gpio_pin[gpio].users++; | ||
297 | |||
298 | gpio_users++; | ||
299 | |||
300 | return 0; | ||
301 | } | ||
302 | EXPORT_SYMBOL(gpio_request); | ||
303 | |||
304 | void gpio_free(unsigned gpio) | ||
305 | { | ||
306 | gpio_users--; | ||
307 | gpio_pin[gpio].users--; | ||
308 | if (unlikely(gpio_pin[gpio].users < 0)) { | ||
309 | dev_warn(gpiodev, "warning: gpio#%d release mismatch\n", | ||
310 | gpio); | ||
311 | gpio_pin[gpio].users = 0; | ||
312 | } | ||
313 | |||
314 | return; | ||
315 | } | ||
316 | EXPORT_SYMBOL(gpio_free); | ||
317 | |||
318 | /* This returns zero or nonzero */ | ||
319 | int gpio_get_value(unsigned gpio) | ||
320 | { | ||
321 | return readl(virtbase + U300_GPIO_PXPDIR + | ||
322 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) & (1 << (gpio & 0x07)); | ||
323 | } | ||
324 | EXPORT_SYMBOL(gpio_get_value); | ||
325 | |||
326 | /* | ||
327 | * We hope that the compiler will optimize away the unused branch | ||
328 | * in case "value" is a constant | ||
329 | */ | ||
330 | void gpio_set_value(unsigned gpio, int value) | ||
331 | { | ||
332 | u32 val; | ||
333 | unsigned long flags; | ||
334 | |||
335 | local_irq_save(flags); | ||
336 | if (value) { | ||
337 | /* set */ | ||
338 | val = readl(virtbase + U300_GPIO_PXPDOR + | ||
339 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) | ||
340 | & (1 << (gpio & 0x07)); | ||
341 | writel(val | (1 << (gpio & 0x07)), virtbase + | ||
342 | U300_GPIO_PXPDOR + | ||
343 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); | ||
344 | } else { | ||
345 | /* clear */ | ||
346 | val = readl(virtbase + U300_GPIO_PXPDOR + | ||
347 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) | ||
348 | & (1 << (gpio & 0x07)); | ||
349 | writel(val & ~(1 << (gpio & 0x07)), virtbase + | ||
350 | U300_GPIO_PXPDOR + | ||
351 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); | ||
352 | } | ||
353 | local_irq_restore(flags); | ||
354 | } | ||
355 | EXPORT_SYMBOL(gpio_set_value); | ||
356 | |||
357 | int gpio_direction_input(unsigned gpio) | ||
358 | { | ||
359 | unsigned long flags; | ||
360 | u32 val; | ||
361 | |||
362 | if (gpio > U300_GPIO_MAX) | ||
363 | return -EINVAL; | ||
364 | |||
365 | local_irq_save(flags); | ||
366 | val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * | ||
367 | U300_GPIO_PORTX_SPACING); | ||
368 | /* Mask out this pin*/ | ||
369 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1)); | ||
370 | /* This is not needed since it sets the bits to zero.*/ | ||
371 | /* val |= (U300_GPIO_PXPCR_PIN_MODE_INPUT << (gpio*2)); */ | ||
372 | writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * | ||
373 | U300_GPIO_PORTX_SPACING); | ||
374 | local_irq_restore(flags); | ||
375 | return 0; | ||
376 | } | ||
377 | EXPORT_SYMBOL(gpio_direction_input); | ||
378 | |||
379 | int gpio_direction_output(unsigned gpio, int value) | ||
380 | { | ||
381 | unsigned long flags; | ||
382 | u32 val; | ||
383 | |||
384 | if (gpio > U300_GPIO_MAX) | ||
385 | return -EINVAL; | ||
386 | |||
387 | local_irq_save(flags); | ||
388 | val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * | ||
389 | U300_GPIO_PORTX_SPACING); | ||
390 | /* Mask out this pin */ | ||
391 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1)); | ||
392 | /* | ||
393 | * FIXME: configure for push/pull, open drain or open source per pin | ||
394 | * in setup. The current driver will only support push/pull. | ||
395 | */ | ||
396 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL | ||
397 | << ((gpio & 0x07) << 1)); | ||
398 | writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) * | ||
399 | U300_GPIO_PORTX_SPACING); | ||
400 | gpio_set_value(gpio, value); | ||
401 | local_irq_restore(flags); | ||
402 | return 0; | ||
403 | } | ||
404 | EXPORT_SYMBOL(gpio_direction_output); | ||
405 | |||
406 | /* | ||
407 | * Enable an IRQ, edge is rising edge (!= 0) or falling edge (==0). | ||
408 | */ | ||
409 | void enable_irq_on_gpio_pin(unsigned gpio, int edge) | ||
410 | { | ||
411 | u32 val; | ||
412 | unsigned long flags; | ||
413 | local_irq_save(flags); | ||
414 | |||
415 | val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * | ||
416 | U300_GPIO_PORTX_SPACING); | ||
417 | val |= (1 << (gpio & 0x07)); | ||
418 | writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * | ||
419 | U300_GPIO_PORTX_SPACING); | ||
420 | val = readl(virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) * | ||
421 | U300_GPIO_PORTX_SPACING); | ||
422 | if (edge) | ||
423 | val |= (1 << (gpio & 0x07)); | ||
424 | else | ||
425 | val &= ~(1 << (gpio & 0x07)); | ||
426 | writel(val, virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) * | ||
427 | U300_GPIO_PORTX_SPACING); | ||
428 | local_irq_restore(flags); | ||
429 | } | ||
430 | EXPORT_SYMBOL(enable_irq_on_gpio_pin); | ||
431 | |||
432 | void disable_irq_on_gpio_pin(unsigned gpio) | ||
433 | { | ||
434 | u32 val; | ||
435 | unsigned long flags; | ||
436 | |||
437 | local_irq_save(flags); | ||
438 | val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * | ||
439 | U300_GPIO_PORTX_SPACING); | ||
440 | val &= ~(1 << (gpio & 0x07)); | ||
441 | writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) * | ||
442 | U300_GPIO_PORTX_SPACING); | ||
443 | local_irq_restore(flags); | ||
444 | } | ||
445 | EXPORT_SYMBOL(disable_irq_on_gpio_pin); | ||
446 | |||
447 | /* Enable (value == 0) or disable (value == 1) internal pullup */ | ||
448 | void gpio_pullup(unsigned gpio, int value) | ||
449 | { | ||
450 | u32 val; | ||
451 | unsigned long flags; | ||
452 | |||
453 | local_irq_save(flags); | ||
454 | if (value) { | ||
455 | val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) * | ||
456 | U300_GPIO_PORTX_SPACING); | ||
457 | writel(val | (1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER + | ||
458 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); | ||
459 | } else { | ||
460 | val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) * | ||
461 | U300_GPIO_PORTX_SPACING); | ||
462 | writel(val & ~(1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER + | ||
463 | PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING); | ||
464 | } | ||
465 | local_irq_restore(flags); | ||
466 | } | ||
467 | EXPORT_SYMBOL(gpio_pullup); | ||
468 | |||
469 | static irqreturn_t gpio_irq_handler(int irq, void *dev_id) | ||
470 | { | ||
471 | struct u300_gpio_port *port = dev_id; | ||
472 | u32 val; | ||
473 | int pin; | ||
474 | |||
475 | /* Read event register */ | ||
476 | val = readl(virtbase + U300_GPIO_PXIEV + port->number * | ||
477 | U300_GPIO_PORTX_SPACING); | ||
478 | /* Mask with enable register */ | ||
479 | val &= readl(virtbase + U300_GPIO_PXIEV + port->number * | ||
480 | U300_GPIO_PORTX_SPACING); | ||
481 | /* Mask relevant bits */ | ||
482 | val &= U300_GPIO_PXIEV_ALL_IRQ_EVENT_MASK; | ||
483 | /* ACK IRQ (clear event) */ | ||
484 | writel(val, virtbase + U300_GPIO_PXIEV + port->number * | ||
485 | U300_GPIO_PORTX_SPACING); | ||
486 | /* Print message */ | ||
487 | while (val != 0) { | ||
488 | unsigned gpio; | ||
489 | |||
490 | pin = __ffs(val); | ||
491 | /* mask off this pin */ | ||
492 | val &= ~(1 << pin); | ||
493 | gpio = (port->number << 3) + pin; | ||
494 | |||
495 | if (gpio_pin[gpio].callback) | ||
496 | (void)gpio_pin[gpio].callback(gpio_pin[gpio].data); | ||
497 | else | ||
498 | dev_dbg(gpiodev, "stray GPIO IRQ on line %d\n", | ||
499 | gpio); | ||
500 | } | ||
501 | return IRQ_HANDLED; | ||
502 | } | ||
503 | |||
504 | static void gpio_set_initial_values(void) | ||
505 | { | ||
506 | #ifdef U300_COH901571_3 | ||
507 | int i, j; | ||
508 | unsigned long flags; | ||
509 | u32 val; | ||
510 | |||
511 | /* Write default values to all pins */ | ||
512 | for (i = 0; i < U300_GPIO_NUM_PORTS; i++) { | ||
513 | val = 0; | ||
514 | for (j = 0; j < 8; j++) | ||
515 | val |= (u32) (u300_gpio_config[i][j].default_output_value != DEFAULT_OUTPUT_LOW) << j; | ||
516 | local_irq_save(flags); | ||
517 | writel(val, virtbase + U300_GPIO_PXPDOR + i * U300_GPIO_PORTX_SPACING); | ||
518 | local_irq_restore(flags); | ||
519 | } | ||
520 | |||
521 | /* | ||
522 | * Put all pins that are set to either 'GPIO_OUT' or 'GPIO_NOT_USED' | ||
523 | * to output and 'GPIO_IN' to input for each port. And initialize | ||
524 | * default value on outputs. | ||
525 | */ | ||
526 | for (i = 0; i < U300_GPIO_NUM_PORTS; i++) { | ||
527 | for (j = 0; j < U300_GPIO_PINS_PER_PORT; j++) { | ||
528 | local_irq_save(flags); | ||
529 | val = readl(virtbase + U300_GPIO_PXPCR + | ||
530 | i * U300_GPIO_PORTX_SPACING); | ||
531 | /* Mask out this pin */ | ||
532 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << (j << 1)); | ||
533 | |||
534 | if (u300_gpio_config[i][j].pin_usage != GPIO_IN) | ||
535 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << (j << 1)); | ||
536 | writel(val, virtbase + U300_GPIO_PXPCR + | ||
537 | i * U300_GPIO_PORTX_SPACING); | ||
538 | local_irq_restore(flags); | ||
539 | } | ||
540 | } | ||
541 | |||
542 | /* Enable or disable the internal pull-ups in the GPIO ASIC block */ | ||
543 | for (i = 0; i < U300_GPIO_MAX; i++) { | ||
544 | val = 0; | ||
545 | for (j = 0; j < 8; j++) | ||
546 | val |= (u32)((u300_gpio_config[i][j].pull_up == DISABLE_PULL_UP) << j); | ||
547 | local_irq_save(flags); | ||
548 | writel(val, virtbase + U300_GPIO_PXPER + i * U300_GPIO_PORTX_SPACING); | ||
549 | local_irq_restore(flags); | ||
550 | } | ||
551 | #endif | ||
552 | } | ||
553 | |||
554 | static int __init gpio_probe(struct platform_device *pdev) | ||
555 | { | ||
556 | u32 val; | ||
557 | int err = 0; | ||
558 | int i; | ||
559 | int num_irqs; | ||
560 | |||
561 | gpiodev = &pdev->dev; | ||
562 | memset(gpio_pin, 0, sizeof(gpio_pin)); | ||
563 | |||
564 | /* Get GPIO clock */ | ||
565 | clk = clk_get(&pdev->dev, NULL); | ||
566 | if (IS_ERR(clk)) { | ||
567 | err = PTR_ERR(clk); | ||
568 | dev_err(gpiodev, "could not get GPIO clock\n"); | ||
569 | goto err_no_clk; | ||
570 | } | ||
571 | err = clk_enable(clk); | ||
572 | if (err) { | ||
573 | dev_err(gpiodev, "could not enable GPIO clock\n"); | ||
574 | goto err_no_clk_enable; | ||
575 | } | ||
576 | |||
577 | memres = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
578 | if (!memres) | ||
579 | goto err_no_resource; | ||
580 | |||
581 | if (!request_mem_region(memres->start, resource_size(memres), | ||
582 | "GPIO Controller")) { | ||
583 | err = -ENODEV; | ||
584 | goto err_no_ioregion; | ||
585 | } | ||
586 | |||
587 | virtbase = ioremap(memres->start, resource_size(memres)); | ||
588 | if (!virtbase) { | ||
589 | err = -ENOMEM; | ||
590 | goto err_no_ioremap; | ||
591 | } | ||
592 | dev_info(gpiodev, "remapped 0x%08x to %p\n", | ||
593 | memres->start, virtbase); | ||
594 | |||
595 | #ifdef U300_COH901335 | ||
596 | dev_info(gpiodev, "initializing GPIO Controller COH 901 335\n"); | ||
597 | /* Turn on the GPIO block */ | ||
598 | writel(U300_GPIO_CR_BLOCK_CLOCK_ENABLE, virtbase + U300_GPIO_CR); | ||
599 | #endif | ||
600 | |||
601 | #ifdef U300_COH901571_3 | ||
602 | dev_info(gpiodev, "initializing GPIO Controller COH 901 571/3\n"); | ||
603 | val = readl(virtbase + U300_GPIO_CR); | ||
604 | dev_info(gpiodev, "COH901571/3 block version: %d, " \ | ||
605 | "number of cores: %d\n", | ||
606 | ((val & 0x0000FE00) >> 9), | ||
607 | ((val & 0x000001FC) >> 2)); | ||
608 | writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR); | ||
609 | #endif | ||
610 | |||
611 | gpio_set_initial_values(); | ||
612 | |||
613 | for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) { | ||
614 | |||
615 | gpio_ports[num_irqs].irq = | ||
616 | platform_get_irq_byname(pdev, | ||
617 | gpio_ports[num_irqs].name); | ||
618 | |||
619 | err = request_irq(gpio_ports[num_irqs].irq, | ||
620 | gpio_irq_handler, IRQF_DISABLED, | ||
621 | gpio_ports[num_irqs].name, | ||
622 | &gpio_ports[num_irqs]); | ||
623 | if (err) { | ||
624 | dev_err(gpiodev, "cannot allocate IRQ for %s!\n", | ||
625 | gpio_ports[num_irqs].name); | ||
626 | goto err_no_irq; | ||
627 | } | ||
628 | /* Turns off PortX_irq_force */ | ||
629 | writel(0x0, virtbase + U300_GPIO_PXIFR + | ||
630 | num_irqs * U300_GPIO_PORTX_SPACING); | ||
631 | } | ||
632 | |||
633 | return 0; | ||
634 | |||
635 | err_no_irq: | ||
636 | for (i = 0; i < num_irqs; i++) | ||
637 | free_irq(gpio_ports[i].irq, &gpio_ports[i]); | ||
638 | iounmap(virtbase); | ||
639 | err_no_ioremap: | ||
640 | release_mem_region(memres->start, resource_size(memres)); | ||
641 | err_no_ioregion: | ||
642 | err_no_resource: | ||
643 | clk_disable(clk); | ||
644 | err_no_clk_enable: | ||
645 | clk_put(clk); | ||
646 | err_no_clk: | ||
647 | dev_info(gpiodev, "module ERROR:%d\n", err); | ||
648 | return err; | ||
649 | } | ||
650 | |||
651 | static int __exit gpio_remove(struct platform_device *pdev) | ||
652 | { | ||
653 | int i; | ||
654 | |||
655 | /* Turn off the GPIO block */ | ||
656 | writel(0x00000000U, virtbase + U300_GPIO_CR); | ||
657 | for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++) | ||
658 | free_irq(gpio_ports[i].irq, &gpio_ports[i]); | ||
659 | iounmap(virtbase); | ||
660 | release_mem_region(memres->start, resource_size(memres)); | ||
661 | clk_disable(clk); | ||
662 | clk_put(clk); | ||
663 | return 0; | ||
664 | } | ||
665 | |||
666 | static struct platform_driver gpio_driver = { | ||
667 | .driver = { | ||
668 | .name = "u300-gpio", | ||
669 | }, | ||
670 | .remove = __exit_p(gpio_remove), | ||
671 | }; | ||
672 | |||
673 | |||
674 | static int __init u300_gpio_init(void) | ||
675 | { | ||
676 | return platform_driver_probe(&gpio_driver, gpio_probe); | ||
677 | } | ||
678 | |||
679 | static void __exit u300_gpio_exit(void) | ||
680 | { | ||
681 | platform_driver_unregister(&gpio_driver); | ||
682 | } | ||
683 | |||
684 | arch_initcall(u300_gpio_init); | ||
685 | module_exit(u300_gpio_exit); | ||
686 | |||
687 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | ||
688 | |||
689 | #ifdef U300_COH901571_3 | ||
690 | MODULE_DESCRIPTION("ST-Ericsson AB COH 901 571/3 GPIO driver"); | ||
691 | #endif | ||
692 | |||
693 | #ifdef U300_COH901335 | ||
694 | MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335 GPIO driver"); | ||
695 | #endif | ||
696 | |||
697 | MODULE_LICENSE("GPL"); | ||