md/raid5: remove redundant bio initialisations.
[deliverable/linux.git] / drivers / gpio / gpio-tegra.c
CommitLineData
3c92db9a
EG
1/*
2 * arch/arm/mach-tegra/gpio.c
3 *
4 * Copyright (c) 2010 Google, Inc
5 *
6 * Author:
7 * Erik Gilling <konkers@google.com>
8 *
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 */
19
20#include <linux/init.h>
21#include <linux/irq.h>
2e47b8b3 22#include <linux/interrupt.h>
3c92db9a
EG
23#include <linux/io.h>
24#include <linux/gpio.h>
df221227 25#include <linux/of.h>
88d8951e
SW
26#include <linux/platform_device.h>
27#include <linux/module.h>
3c92db9a 28
98022940
WD
29#include <asm/mach/irq.h>
30
ea5abbd2 31#include <mach/gpio-tegra.h>
3c92db9a 32#include <mach/iomap.h>
2ea67fd1 33#include <mach/suspend.h>
3c92db9a
EG
34
35#define GPIO_BANK(x) ((x) >> 5)
36#define GPIO_PORT(x) (((x) >> 3) & 0x3)
37#define GPIO_BIT(x) ((x) & 0x7)
38
88d8951e 39#define GPIO_REG(x) (GPIO_BANK(x) * 0x80 + GPIO_PORT(x) * 4)
3c92db9a
EG
40
41#define GPIO_CNF(x) (GPIO_REG(x) + 0x00)
42#define GPIO_OE(x) (GPIO_REG(x) + 0x10)
43#define GPIO_OUT(x) (GPIO_REG(x) + 0X20)
44#define GPIO_IN(x) (GPIO_REG(x) + 0x30)
45#define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40)
46#define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50)
47#define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60)
48#define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70)
49
50#define GPIO_MSK_CNF(x) (GPIO_REG(x) + 0x800)
51#define GPIO_MSK_OE(x) (GPIO_REG(x) + 0x810)
52#define GPIO_MSK_OUT(x) (GPIO_REG(x) + 0X820)
53#define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + 0x840)
54#define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + 0x850)
55#define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + 0x860)
56
57#define GPIO_INT_LVL_MASK 0x010101
58#define GPIO_INT_LVL_EDGE_RISING 0x000101
59#define GPIO_INT_LVL_EDGE_FALLING 0x000100
60#define GPIO_INT_LVL_EDGE_BOTH 0x010100
61#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
62#define GPIO_INT_LVL_LEVEL_LOW 0x000000
63
64struct tegra_gpio_bank {
65 int bank;
66 int irq;
67 spinlock_t lvl_lock[4];
2e47b8b3
CC
68#ifdef CONFIG_PM
69 u32 cnf[4];
70 u32 out[4];
71 u32 oe[4];
72 u32 int_enb[4];
73 u32 int_lvl[4];
74#endif
3c92db9a
EG
75};
76
77
88d8951e
SW
78static void __iomem *regs;
79static struct tegra_gpio_bank tegra_gpio_banks[7];
80
81static inline void tegra_gpio_writel(u32 val, u32 reg)
82{
83 __raw_writel(val, regs + reg);
84}
85
86static inline u32 tegra_gpio_readl(u32 reg)
87{
88 return __raw_readl(regs + reg);
89}
3c92db9a
EG
90
91static int tegra_gpio_compose(int bank, int port, int bit)
92{
93 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
94}
95
96static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
97{
98 u32 val;
99
100 val = 0x100 << GPIO_BIT(gpio);
101 if (value)
102 val |= 1 << GPIO_BIT(gpio);
88d8951e 103 tegra_gpio_writel(val, reg);
3c92db9a
EG
104}
105
106void tegra_gpio_enable(int gpio)
107{
108 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
109}
110
111void tegra_gpio_disable(int gpio)
112{
113 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
114}
115
116static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
117{
118 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
119}
120
121static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
122{
88d8951e 123 return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
3c92db9a
EG
124}
125
126static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
127{
128 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
129 return 0;
130}
131
132static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
133 int value)
134{
135 tegra_gpio_set(chip, offset, value);
136 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
137 return 0;
138}
139
438a99c0
SW
140static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
141{
142 return TEGRA_GPIO_TO_IRQ(offset);
143}
3c92db9a
EG
144
145static struct gpio_chip tegra_gpio_chip = {
146 .label = "tegra-gpio",
147 .direction_input = tegra_gpio_direction_input,
148 .get = tegra_gpio_get,
149 .direction_output = tegra_gpio_direction_output,
150 .set = tegra_gpio_set,
438a99c0 151 .to_irq = tegra_gpio_to_irq,
3c92db9a 152 .base = 0,
2e47b8b3 153 .ngpio = TEGRA_NR_GPIOS,
3c92db9a
EG
154};
155
37337a8d 156static void tegra_gpio_irq_ack(struct irq_data *d)
3c92db9a 157{
37337a8d 158 int gpio = d->irq - INT_GPIO_BASE;
3c92db9a 159
88d8951e 160 tegra_gpio_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
3c92db9a
EG
161}
162
37337a8d 163static void tegra_gpio_irq_mask(struct irq_data *d)
3c92db9a 164{
37337a8d 165 int gpio = d->irq - INT_GPIO_BASE;
3c92db9a
EG
166
167 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
168}
169
37337a8d 170static void tegra_gpio_irq_unmask(struct irq_data *d)
3c92db9a 171{
37337a8d 172 int gpio = d->irq - INT_GPIO_BASE;
3c92db9a
EG
173
174 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
175}
176
37337a8d 177static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
3c92db9a 178{
37337a8d
LB
179 int gpio = d->irq - INT_GPIO_BASE;
180 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
3c92db9a
EG
181 int port = GPIO_PORT(gpio);
182 int lvl_type;
183 int val;
184 unsigned long flags;
185
186 switch (type & IRQ_TYPE_SENSE_MASK) {
187 case IRQ_TYPE_EDGE_RISING:
188 lvl_type = GPIO_INT_LVL_EDGE_RISING;
189 break;
190
191 case IRQ_TYPE_EDGE_FALLING:
192 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
193 break;
194
195 case IRQ_TYPE_EDGE_BOTH:
196 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
197 break;
198
199 case IRQ_TYPE_LEVEL_HIGH:
200 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
201 break;
202
203 case IRQ_TYPE_LEVEL_LOW:
204 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
205 break;
206
207 default:
208 return -EINVAL;
209 }
210
211 spin_lock_irqsave(&bank->lvl_lock[port], flags);
212
88d8951e 213 val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
3c92db9a
EG
214 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
215 val |= lvl_type << GPIO_BIT(gpio);
88d8951e 216 tegra_gpio_writel(val, GPIO_INT_LVL(gpio));
3c92db9a
EG
217
218 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
219
220 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
6845664a 221 __irq_set_handler_locked(d->irq, handle_level_irq);
3c92db9a 222 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
6845664a 223 __irq_set_handler_locked(d->irq, handle_edge_irq);
3c92db9a
EG
224
225 return 0;
226}
227
228static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
229{
230 struct tegra_gpio_bank *bank;
231 int port;
232 int pin;
233 int unmasked = 0;
98022940 234 struct irq_chip *chip = irq_desc_get_chip(desc);
3c92db9a 235
98022940 236 chained_irq_enter(chip, desc);
3c92db9a 237
6845664a 238 bank = irq_get_handler_data(irq);
3c92db9a
EG
239
240 for (port = 0; port < 4; port++) {
241 int gpio = tegra_gpio_compose(bank->bank, port, 0);
88d8951e
SW
242 unsigned long sta = tegra_gpio_readl(GPIO_INT_STA(gpio)) &
243 tegra_gpio_readl(GPIO_INT_ENB(gpio));
244 u32 lvl = tegra_gpio_readl(GPIO_INT_LVL(gpio));
3c92db9a
EG
245
246 for_each_set_bit(pin, &sta, 8) {
88d8951e 247 tegra_gpio_writel(1 << pin, GPIO_INT_CLR(gpio));
3c92db9a
EG
248
249 /* if gpio is edge triggered, clear condition
250 * before executing the hander so that we don't
251 * miss edges
252 */
253 if (lvl & (0x100 << pin)) {
254 unmasked = 1;
98022940 255 chained_irq_exit(chip, desc);
3c92db9a
EG
256 }
257
258 generic_handle_irq(gpio_to_irq(gpio + pin));
259 }
260 }
261
262 if (!unmasked)
98022940 263 chained_irq_exit(chip, desc);
3c92db9a
EG
264
265}
266
2e47b8b3
CC
267#ifdef CONFIG_PM
268void tegra_gpio_resume(void)
269{
270 unsigned long flags;
c8309ef6
CC
271 int b;
272 int p;
2e47b8b3
CC
273
274 local_irq_save(flags);
275
276 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
277 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
278
279 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
280 unsigned int gpio = (b<<5) | (p<<3);
88d8951e
SW
281 tegra_gpio_writel(bank->cnf[p], GPIO_CNF(gpio));
282 tegra_gpio_writel(bank->out[p], GPIO_OUT(gpio));
283 tegra_gpio_writel(bank->oe[p], GPIO_OE(gpio));
284 tegra_gpio_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
285 tegra_gpio_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
2e47b8b3
CC
286 }
287 }
288
289 local_irq_restore(flags);
2e47b8b3
CC
290}
291
292void tegra_gpio_suspend(void)
293{
294 unsigned long flags;
c8309ef6
CC
295 int b;
296 int p;
2e47b8b3 297
2e47b8b3
CC
298 local_irq_save(flags);
299 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
300 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
301
302 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
303 unsigned int gpio = (b<<5) | (p<<3);
88d8951e
SW
304 bank->cnf[p] = tegra_gpio_readl(GPIO_CNF(gpio));
305 bank->out[p] = tegra_gpio_readl(GPIO_OUT(gpio));
306 bank->oe[p] = tegra_gpio_readl(GPIO_OE(gpio));
307 bank->int_enb[p] = tegra_gpio_readl(GPIO_INT_ENB(gpio));
308 bank->int_lvl[p] = tegra_gpio_readl(GPIO_INT_LVL(gpio));
2e47b8b3
CC
309 }
310 }
311 local_irq_restore(flags);
312}
313
37337a8d 314static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
2e47b8b3 315{
37337a8d 316 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
6845664a 317 return irq_set_irq_wake(bank->irq, enable);
2e47b8b3
CC
318}
319#endif
3c92db9a
EG
320
321static struct irq_chip tegra_gpio_irq_chip = {
322 .name = "GPIO",
37337a8d
LB
323 .irq_ack = tegra_gpio_irq_ack,
324 .irq_mask = tegra_gpio_irq_mask,
325 .irq_unmask = tegra_gpio_irq_unmask,
326 .irq_set_type = tegra_gpio_irq_set_type,
2e47b8b3 327#ifdef CONFIG_PM
37337a8d 328 .irq_set_wake = tegra_gpio_wake_enable,
2e47b8b3 329#endif
3c92db9a
EG
330};
331
332
333/* This lock class tells lockdep that GPIO irqs are in a different
334 * category than their parents, so it won't report false recursion.
335 */
336static struct lock_class_key gpio_lock_class;
337
88d8951e 338static int __devinit tegra_gpio_probe(struct platform_device *pdev)
3c92db9a 339{
88d8951e 340 struct resource *res;
3c92db9a 341 struct tegra_gpio_bank *bank;
47008001 342 int gpio;
3c92db9a
EG
343 int i;
344 int j;
345
88d8951e
SW
346 for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) {
347 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
348 if (!res) {
349 dev_err(&pdev->dev, "Missing IRQ resource\n");
350 return -ENODEV;
351 }
352
353 bank = &tegra_gpio_banks[i];
354 bank->bank = i;
355 bank->irq = res->start;
356 }
357
358 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
359 if (!res) {
360 dev_err(&pdev->dev, "Missing MEM resource\n");
361 return -ENODEV;
362 }
363
364 if (!devm_request_mem_region(&pdev->dev, res->start,
365 resource_size(res),
366 dev_name(&pdev->dev))) {
367 dev_err(&pdev->dev, "Couldn't request MEM resource\n");
368 return -ENODEV;
369 }
370
371 regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
372 if (!regs) {
373 dev_err(&pdev->dev, "Couldn't ioremap regs\n");
374 return -ENODEV;
375 }
376
3c92db9a
EG
377 for (i = 0; i < 7; i++) {
378 for (j = 0; j < 4; j++) {
379 int gpio = tegra_gpio_compose(i, j, 0);
88d8951e 380 tegra_gpio_writel(0x00, GPIO_INT_ENB(gpio));
3c92db9a
EG
381 }
382 }
383
df221227 384#ifdef CONFIG_OF_GPIO
88d8951e
SW
385 tegra_gpio_chip.of_node = pdev->dev.of_node;
386#endif
df221227 387
3c92db9a
EG
388 gpiochip_add(&tegra_gpio_chip);
389
47008001
SW
390 for (gpio = 0; gpio < TEGRA_NR_GPIOS; gpio++) {
391 int irq = TEGRA_GPIO_TO_IRQ(gpio);
392 /* No validity check; all Tegra GPIOs are valid IRQs */
3c92db9a 393
47008001 394 bank = &tegra_gpio_banks[GPIO_BANK(gpio)];
3c92db9a 395
47008001
SW
396 irq_set_lockdep_class(irq, &gpio_lock_class);
397 irq_set_chip_data(irq, bank);
398 irq_set_chip_and_handler(irq, &tegra_gpio_irq_chip,
f38c02f3 399 handle_simple_irq);
47008001 400 set_irq_flags(irq, IRQF_VALID);
3c92db9a
EG
401 }
402
403 for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) {
404 bank = &tegra_gpio_banks[i];
405
6845664a
TG
406 irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler);
407 irq_set_handler_data(bank->irq, bank);
3c92db9a
EG
408
409 for (j = 0; j < 4; j++)
410 spin_lock_init(&bank->lvl_lock[j]);
411 }
412
413 return 0;
414}
415
88d8951e
SW
416static struct of_device_id tegra_gpio_of_match[] __devinitdata = {
417 { .compatible = "nvidia,tegra20-gpio", },
418 { },
419};
420
421static struct platform_driver tegra_gpio_driver = {
422 .driver = {
423 .name = "tegra-gpio",
424 .owner = THIS_MODULE,
425 .of_match_table = tegra_gpio_of_match,
426 },
427 .probe = tegra_gpio_probe,
428};
429
430static int __init tegra_gpio_init(void)
431{
432 return platform_driver_register(&tegra_gpio_driver);
433}
3c92db9a
EG
434postcore_initcall(tegra_gpio_init);
435
632095ea
OJ
436void __init tegra_gpio_config(struct tegra_gpio_table *table, int num)
437{
438 int i;
439
440 for (i = 0; i < num; i++) {
441 int gpio = table[i].gpio;
442
443 if (table[i].enable)
444 tegra_gpio_enable(gpio);
445 else
446 tegra_gpio_disable(gpio);
447 }
448}
449
3c92db9a
EG
450#ifdef CONFIG_DEBUG_FS
451
452#include <linux/debugfs.h>
453#include <linux/seq_file.h>
454
455static int dbg_gpio_show(struct seq_file *s, void *unused)
456{
457 int i;
458 int j;
459
460 for (i = 0; i < 7; i++) {
461 for (j = 0; j < 4; j++) {
462 int gpio = tegra_gpio_compose(i, j, 0);
2e47b8b3
CC
463 seq_printf(s,
464 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
465 i, j,
88d8951e
SW
466 tegra_gpio_readl(GPIO_CNF(gpio)),
467 tegra_gpio_readl(GPIO_OE(gpio)),
468 tegra_gpio_readl(GPIO_OUT(gpio)),
469 tegra_gpio_readl(GPIO_IN(gpio)),
470 tegra_gpio_readl(GPIO_INT_STA(gpio)),
471 tegra_gpio_readl(GPIO_INT_ENB(gpio)),
472 tegra_gpio_readl(GPIO_INT_LVL(gpio)));
3c92db9a
EG
473 }
474 }
475 return 0;
476}
477
478static int dbg_gpio_open(struct inode *inode, struct file *file)
479{
480 return single_open(file, dbg_gpio_show, &inode->i_private);
481}
482
483static const struct file_operations debug_fops = {
484 .open = dbg_gpio_open,
485 .read = seq_read,
486 .llseek = seq_lseek,
487 .release = single_release,
488};
489
490static int __init tegra_gpio_debuginit(void)
491{
492 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
493 NULL, NULL, &debug_fops);
494 return 0;
495}
496late_initcall(tegra_gpio_debuginit);
497#endif
This page took 0.125443 seconds and 5 git commands to generate.