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Alessandro Rubini2ec1d352009-07-02 15:29:12 +01001/*
2 * Generic GPIO driver for logic cells found in the Nomadik SoC
3 *
4 * Copyright (C) 2008,2009 STMicroelectronics
5 * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
6 * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/device.h>
Rabin Vincent3e3c62c2010-03-03 04:52:34 +010016#include <linux/platform_device.h>
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010017#include <linux/io.h>
Rabin Vincentaf7dc222010-05-06 11:14:17 +010018#include <linux/clk.h>
19#include <linux/err.h>
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010020#include <linux/gpio.h>
21#include <linux/spinlock.h>
22#include <linux/interrupt.h>
23#include <linux/irq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010025
Rabin Vincent378be062010-06-02 06:06:29 +010026#include <plat/pincfg.h>
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010027#include <mach/hardware.h>
28#include <mach/gpio.h>
29
30/*
31 * The GPIO module in the Nomadik family of Systems-on-Chip is an
32 * AMBA device, managing 32 pins and alternate functions. The logic block
33 * is currently only used in the Nomadik.
34 *
35 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
36 */
37
38#define NMK_GPIO_PER_CHIP 32
39struct nmk_gpio_chip {
40 struct gpio_chip chip;
41 void __iomem *addr;
Rabin Vincentaf7dc222010-05-06 11:14:17 +010042 struct clk *clk;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010043 unsigned int parent_irq;
Rabin Vincentc0fcb8d2010-03-03 04:48:54 +010044 spinlock_t lock;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010045 /* Keep track of configured edges */
46 u32 edge_rising;
47 u32 edge_falling;
48};
49
Rabin Vincent6f9a9742010-06-02 05:50:28 +010050static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
51 unsigned offset, int gpio_mode)
52{
53 u32 bit = 1 << offset;
54 u32 afunc, bfunc;
55
56 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
57 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
58 if (gpio_mode & NMK_GPIO_ALT_A)
59 afunc |= bit;
60 if (gpio_mode & NMK_GPIO_ALT_B)
61 bfunc |= bit;
62 writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
63 writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
64}
65
Rabin Vincent81a3c292010-05-27 12:39:23 +010066static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
67 unsigned offset, enum nmk_gpio_slpm mode)
68{
69 u32 bit = 1 << offset;
70 u32 slpm;
71
72 slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
73 if (mode == NMK_GPIO_SLPM_NOCHANGE)
74 slpm |= bit;
75 else
76 slpm &= ~bit;
77 writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
78}
79
Rabin Vincent5b327ed2010-05-27 12:29:50 +010080static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
81 unsigned offset, enum nmk_gpio_pull pull)
82{
83 u32 bit = 1 << offset;
84 u32 pdis;
85
86 pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
87 if (pull == NMK_GPIO_PULL_NONE)
88 pdis |= bit;
89 else
90 pdis &= ~bit;
91 writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
92
93 if (pull == NMK_GPIO_PULL_UP)
94 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
95 else if (pull == NMK_GPIO_PULL_DOWN)
96 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
97}
98
Rabin Vincent378be062010-06-02 06:06:29 +010099static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
100 unsigned offset)
101{
102 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
103}
104
105static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
106 pin_cfg_t cfg)
107{
108 static const char *afnames[] = {
109 [NMK_GPIO_ALT_GPIO] = "GPIO",
110 [NMK_GPIO_ALT_A] = "A",
111 [NMK_GPIO_ALT_B] = "B",
112 [NMK_GPIO_ALT_C] = "C"
113 };
114 static const char *pullnames[] = {
115 [NMK_GPIO_PULL_NONE] = "none",
116 [NMK_GPIO_PULL_UP] = "up",
117 [NMK_GPIO_PULL_DOWN] = "down",
118 [3] /* illegal */ = "??"
119 };
120 static const char *slpmnames[] = {
121 [NMK_GPIO_SLPM_INPUT] = "input",
122 [NMK_GPIO_SLPM_NOCHANGE] = "no-change",
123 };
124
125 int pin = PIN_NUM(cfg);
126 int pull = PIN_PULL(cfg);
127 int af = PIN_ALT(cfg);
128 int slpm = PIN_SLPM(cfg);
129
130 dev_dbg(nmk_chip->chip.dev, "pin %d: af %s, pull %s, slpm %s\n",
131 pin, afnames[af], pullnames[pull], slpmnames[slpm]);
132
133 __nmk_gpio_make_input(nmk_chip, offset);
134 __nmk_gpio_set_pull(nmk_chip, offset, pull);
135 __nmk_gpio_set_slpm(nmk_chip, offset, slpm);
136 __nmk_gpio_set_mode(nmk_chip, offset, af);
137}
138
139/**
140 * nmk_config_pin - configure a pin's mux attributes
141 * @cfg: pin confguration
142 *
143 * Configures a pin's mode (alternate function or GPIO), its pull up status,
144 * and its sleep mode based on the specified configuration. The @cfg is
145 * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
146 * are constructed using, and can be further enhanced with, the macros in
147 * plat/pincfg.h.
148 *
149 * If a pin's mode is set to GPIO, it is configured as an input to avoid
150 * side-effects. The gpio can be manipulated later using standard GPIO API
151 * calls.
152 */
153int nmk_config_pin(pin_cfg_t cfg)
154{
155 struct nmk_gpio_chip *nmk_chip;
156 int gpio = PIN_NUM(cfg);
157 unsigned long flags;
158
159 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
160 if (!nmk_chip)
161 return -EINVAL;
162
163 spin_lock_irqsave(&nmk_chip->lock, flags);
164 __nmk_config_pin(nmk_chip, gpio - nmk_chip->chip.base, cfg);
165 spin_unlock_irqrestore(&nmk_chip->lock, flags);
166
167 return 0;
168}
169EXPORT_SYMBOL(nmk_config_pin);
170
171/**
172 * nmk_config_pins - configure several pins at once
173 * @cfgs: array of pin configurations
174 * @num: number of elments in the array
175 *
176 * Configures several pins using nmk_config_pin(). Refer to that function for
177 * further information.
178 */
179int nmk_config_pins(pin_cfg_t *cfgs, int num)
180{
181 int ret = 0;
182 int i;
183
184 for (i = 0; i < num; i++) {
185 int ret = nmk_config_pin(cfgs[i]);
186 if (ret)
187 break;
188 }
189
190 return ret;
191}
192EXPORT_SYMBOL(nmk_config_pins);
193
Rabin Vincent5b327ed2010-05-27 12:29:50 +0100194/**
Rabin Vincent81a3c292010-05-27 12:39:23 +0100195 * nmk_gpio_set_slpm() - configure the sleep mode of a pin
196 * @gpio: pin number
197 * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
198 *
199 * Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is
200 * changed to an input (with pullup/down enabled) in sleep and deep sleep. If
201 * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was
202 * configured even when in sleep and deep sleep.
203 */
204int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
205{
206 struct nmk_gpio_chip *nmk_chip;
207 unsigned long flags;
208
209 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
210 if (!nmk_chip)
211 return -EINVAL;
212
213 spin_lock_irqsave(&nmk_chip->lock, flags);
214 __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode);
215 spin_unlock_irqrestore(&nmk_chip->lock, flags);
216
217 return 0;
218}
219
220/**
Rabin Vincent5b327ed2010-05-27 12:29:50 +0100221 * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
222 * @gpio: pin number
223 * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE
224 *
225 * Enables/disables pull up/down on a specified pin. This only takes effect if
226 * the pin is configured as an input (either explicitly or by the alternate
227 * function).
228 *
229 * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
230 * configured as an input. Otherwise, due to the way the controller registers
231 * work, this function will change the value output on the pin.
232 */
233int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
234{
235 struct nmk_gpio_chip *nmk_chip;
236 unsigned long flags;
237
238 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
239 if (!nmk_chip)
240 return -EINVAL;
241
242 spin_lock_irqsave(&nmk_chip->lock, flags);
243 __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull);
244 spin_unlock_irqrestore(&nmk_chip->lock, flags);
245
246 return 0;
247}
248
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100249/* Mode functions */
250int nmk_gpio_set_mode(int gpio, int gpio_mode)
251{
252 struct nmk_gpio_chip *nmk_chip;
253 unsigned long flags;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100254
255 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
256 if (!nmk_chip)
257 return -EINVAL;
258
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100259 spin_lock_irqsave(&nmk_chip->lock, flags);
Rabin Vincent6f9a9742010-06-02 05:50:28 +0100260 __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100261 spin_unlock_irqrestore(&nmk_chip->lock, flags);
262
263 return 0;
264}
265EXPORT_SYMBOL(nmk_gpio_set_mode);
266
267int nmk_gpio_get_mode(int gpio)
268{
269 struct nmk_gpio_chip *nmk_chip;
270 u32 afunc, bfunc, bit;
271
272 nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
273 if (!nmk_chip)
274 return -EINVAL;
275
276 bit = 1 << (gpio - nmk_chip->chip.base);
277
278 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
279 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
280
281 return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
282}
283EXPORT_SYMBOL(nmk_gpio_get_mode);
284
285
286/* IRQ functions */
287static inline int nmk_gpio_get_bitmask(int gpio)
288{
289 return 1 << (gpio % 32);
290}
291
292static void nmk_gpio_irq_ack(unsigned int irq)
293{
294 int gpio;
295 struct nmk_gpio_chip *nmk_chip;
296
297 gpio = NOMADIK_IRQ_TO_GPIO(irq);
298 nmk_chip = get_irq_chip_data(irq);
299 if (!nmk_chip)
300 return;
301 writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
302}
303
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100304static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
305 int gpio, bool enable)
306{
307 u32 bitmask = nmk_gpio_get_bitmask(gpio);
308 u32 reg;
309
310 /* we must individually set/clear the two edges */
311 if (nmk_chip->edge_rising & bitmask) {
312 reg = readl(nmk_chip->addr + NMK_GPIO_RIMSC);
313 if (enable)
314 reg |= bitmask;
315 else
316 reg &= ~bitmask;
317 writel(reg, nmk_chip->addr + NMK_GPIO_RIMSC);
318 }
319 if (nmk_chip->edge_falling & bitmask) {
320 reg = readl(nmk_chip->addr + NMK_GPIO_FIMSC);
321 if (enable)
322 reg |= bitmask;
323 else
324 reg &= ~bitmask;
325 writel(reg, nmk_chip->addr + NMK_GPIO_FIMSC);
326 }
327}
328
329static void nmk_gpio_irq_modify(unsigned int irq, bool enable)
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100330{
331 int gpio;
332 struct nmk_gpio_chip *nmk_chip;
333 unsigned long flags;
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100334 u32 bitmask;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100335
336 gpio = NOMADIK_IRQ_TO_GPIO(irq);
337 nmk_chip = get_irq_chip_data(irq);
338 bitmask = nmk_gpio_get_bitmask(gpio);
339 if (!nmk_chip)
340 return;
341
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100342 spin_lock_irqsave(&nmk_chip->lock, flags);
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100343 __nmk_gpio_irq_modify(nmk_chip, gpio, enable);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100344 spin_unlock_irqrestore(&nmk_chip->lock, flags);
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100345}
346
347static void nmk_gpio_irq_mask(unsigned int irq)
348{
349 nmk_gpio_irq_modify(irq, false);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100350};
351
352static void nmk_gpio_irq_unmask(unsigned int irq)
353{
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100354 nmk_gpio_irq_modify(irq, true);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100355}
356
357static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
358{
Rabin Vincent7a852d82010-05-06 10:43:55 +0100359 bool enabled = !(irq_to_desc(irq)->status & IRQ_DISABLED);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100360 int gpio;
361 struct nmk_gpio_chip *nmk_chip;
362 unsigned long flags;
363 u32 bitmask;
364
365 gpio = NOMADIK_IRQ_TO_GPIO(irq);
366 nmk_chip = get_irq_chip_data(irq);
367 bitmask = nmk_gpio_get_bitmask(gpio);
368 if (!nmk_chip)
369 return -EINVAL;
370
371 if (type & IRQ_TYPE_LEVEL_HIGH)
372 return -EINVAL;
373 if (type & IRQ_TYPE_LEVEL_LOW)
374 return -EINVAL;
375
376 spin_lock_irqsave(&nmk_chip->lock, flags);
377
Rabin Vincent7a852d82010-05-06 10:43:55 +0100378 if (enabled)
379 __nmk_gpio_irq_modify(nmk_chip, gpio, false);
380
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100381 nmk_chip->edge_rising &= ~bitmask;
382 if (type & IRQ_TYPE_EDGE_RISING)
383 nmk_chip->edge_rising |= bitmask;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100384
385 nmk_chip->edge_falling &= ~bitmask;
386 if (type & IRQ_TYPE_EDGE_FALLING)
387 nmk_chip->edge_falling |= bitmask;
Rabin Vincent7a852d82010-05-06 10:43:55 +0100388
389 if (enabled)
390 __nmk_gpio_irq_modify(nmk_chip, gpio, true);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100391
392 spin_unlock_irqrestore(&nmk_chip->lock, flags);
393
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100394 return 0;
395}
396
397static struct irq_chip nmk_gpio_irq_chip = {
398 .name = "Nomadik-GPIO",
399 .ack = nmk_gpio_irq_ack,
400 .mask = nmk_gpio_irq_mask,
401 .unmask = nmk_gpio_irq_unmask,
402 .set_type = nmk_gpio_irq_set_type,
403};
404
405static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
406{
407 struct nmk_gpio_chip *nmk_chip;
Rabin Vincentaaedaa22010-03-03 04:50:27 +0100408 struct irq_chip *host_chip = get_irq_chip(irq);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100409 unsigned int gpio_irq;
410 u32 pending;
411 unsigned int first_irq;
412
Rabin Vincentaaedaa22010-03-03 04:50:27 +0100413 if (host_chip->mask_ack)
414 host_chip->mask_ack(irq);
415 else {
416 host_chip->mask(irq);
417 if (host_chip->ack)
418 host_chip->ack(irq);
419 }
420
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100421 nmk_chip = get_irq_data(irq);
422 first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
423 while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
424 gpio_irq = first_irq + __ffs(pending);
425 generic_handle_irq(gpio_irq);
426 }
Rabin Vincentaaedaa22010-03-03 04:50:27 +0100427
428 host_chip->unmask(irq);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100429}
430
431static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
432{
433 unsigned int first_irq;
434 int i;
435
436 first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
437 for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
438 set_irq_chip(i, &nmk_gpio_irq_chip);
439 set_irq_handler(i, handle_edge_irq);
440 set_irq_flags(i, IRQF_VALID);
441 set_irq_chip_data(i, nmk_chip);
Rabin Vincent2210d642010-05-06 10:45:18 +0100442 set_irq_type(i, IRQ_TYPE_EDGE_FALLING);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100443 }
444 set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
445 set_irq_data(nmk_chip->parent_irq, nmk_chip);
446 return 0;
447}
448
449/* I/O Functions */
450static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
451{
452 struct nmk_gpio_chip *nmk_chip =
453 container_of(chip, struct nmk_gpio_chip, chip);
454
455 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
456 return 0;
457}
458
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100459static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
460{
461 struct nmk_gpio_chip *nmk_chip =
462 container_of(chip, struct nmk_gpio_chip, chip);
463 u32 bit = 1 << offset;
464
465 return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
466}
467
468static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
469 int val)
470{
471 struct nmk_gpio_chip *nmk_chip =
472 container_of(chip, struct nmk_gpio_chip, chip);
473 u32 bit = 1 << offset;
474
475 if (val)
476 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
477 else
478 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
479}
480
Rabin Vincent6647c6c2010-05-27 12:22:42 +0100481static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
482 int val)
483{
484 struct nmk_gpio_chip *nmk_chip =
485 container_of(chip, struct nmk_gpio_chip, chip);
486
487 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
488 nmk_gpio_set_output(chip, offset, val);
489
490 return 0;
491}
492
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100493/* This structure is replicated for each GPIO block allocated at probe time */
494static struct gpio_chip nmk_gpio_template = {
495 .direction_input = nmk_gpio_make_input,
496 .get = nmk_gpio_get_input,
497 .direction_output = nmk_gpio_make_output,
498 .set = nmk_gpio_set_output,
499 .ngpio = NMK_GPIO_PER_CHIP,
500 .can_sleep = 0,
501};
502
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100503static int __init nmk_gpio_probe(struct platform_device *dev)
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100504{
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100505 struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100506 struct nmk_gpio_chip *nmk_chip;
507 struct gpio_chip *chip;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100508 struct resource *res;
Rabin Vincentaf7dc222010-05-06 11:14:17 +0100509 struct clk *clk;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100510 int irq;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100511 int ret;
512
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100513 if (!pdata)
514 return -ENODEV;
515
516 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
517 if (!res) {
518 ret = -ENOENT;
519 goto out;
520 }
521
522 irq = platform_get_irq(dev, 0);
523 if (irq < 0) {
524 ret = irq;
525 goto out;
526 }
527
528 if (request_mem_region(res->start, resource_size(res),
529 dev_name(&dev->dev)) == NULL) {
530 ret = -EBUSY;
531 goto out;
532 }
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100533
Rabin Vincentaf7dc222010-05-06 11:14:17 +0100534 clk = clk_get(&dev->dev, NULL);
535 if (IS_ERR(clk)) {
536 ret = PTR_ERR(clk);
537 goto out_release;
538 }
539
540 clk_enable(clk);
541
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100542 nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
543 if (!nmk_chip) {
544 ret = -ENOMEM;
Rabin Vincentaf7dc222010-05-06 11:14:17 +0100545 goto out_clk;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100546 }
547 /*
548 * The virt address in nmk_chip->addr is in the nomadik register space,
549 * so we can simply convert the resource address, without remapping
550 */
Rabin Vincentaf7dc222010-05-06 11:14:17 +0100551 nmk_chip->clk = clk;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100552 nmk_chip->addr = io_p2v(res->start);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100553 nmk_chip->chip = nmk_gpio_template;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100554 nmk_chip->parent_irq = irq;
Rabin Vincentc0fcb8d2010-03-03 04:48:54 +0100555 spin_lock_init(&nmk_chip->lock);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100556
557 chip = &nmk_chip->chip;
558 chip->base = pdata->first_gpio;
559 chip->label = pdata->name;
560 chip->dev = &dev->dev;
561 chip->owner = THIS_MODULE;
562
563 ret = gpiochip_add(&nmk_chip->chip);
564 if (ret)
565 goto out_free;
566
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100567 platform_set_drvdata(dev, nmk_chip);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100568
569 nmk_gpio_init_irq(nmk_chip);
570
571 dev_info(&dev->dev, "Bits %i-%i at address %p\n",
572 nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
573 return 0;
574
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100575out_free:
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100576 kfree(nmk_chip);
Rabin Vincentaf7dc222010-05-06 11:14:17 +0100577out_clk:
578 clk_disable(clk);
579 clk_put(clk);
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100580out_release:
581 release_mem_region(res->start, resource_size(res));
582out:
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100583 dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
584 pdata->first_gpio, pdata->first_gpio+31);
585 return ret;
586}
587
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100588static int __exit nmk_gpio_remove(struct platform_device *dev)
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100589{
590 struct nmk_gpio_chip *nmk_chip;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100591 struct resource *res;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100592
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100593 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
594
595 nmk_chip = platform_get_drvdata(dev);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100596 gpiochip_remove(&nmk_chip->chip);
Rabin Vincentaf7dc222010-05-06 11:14:17 +0100597 clk_disable(nmk_chip->clk);
598 clk_put(nmk_chip->clk);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100599 kfree(nmk_chip);
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100600 release_mem_region(res->start, resource_size(res));
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100601 return 0;
602}
603
604
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100605static struct platform_driver nmk_gpio_driver = {
606 .driver = {
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100607 .owner = THIS_MODULE,
608 .name = "gpio",
609 },
610 .probe = nmk_gpio_probe,
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100611 .remove = __exit_p(nmk_gpio_remove),
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100612 .suspend = NULL, /* to be done */
613 .resume = NULL,
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100614};
615
616static int __init nmk_gpio_init(void)
617{
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100618 return platform_driver_register(&nmk_gpio_driver);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100619}
620
621arch_initcall(nmk_gpio_init);
622
623MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
624MODULE_DESCRIPTION("Nomadik GPIO Driver");
625MODULE_LICENSE("GPL");
626
627