Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[zen-stable.git] / drivers / gpio / gpio-tegra.c
blob61044c889f7fec11ef8f0f6b81c78fafd15c87a3
1 /*
2 * arch/arm/mach-tegra/gpio.c
4 * Copyright (c) 2010 Google, Inc
6 * Author:
7 * Erik Gilling <konkers@google.com>
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.
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.
20 #include <linux/init.h>
21 #include <linux/irq.h>
22 #include <linux/interrupt.h>
23 #include <linux/io.h>
24 #include <linux/gpio.h>
25 #include <linux/of.h>
26 #include <linux/platform_device.h>
27 #include <linux/module.h>
29 #include <asm/mach/irq.h>
31 #include <mach/gpio-tegra.h>
32 #include <mach/iomap.h>
33 #include <mach/suspend.h>
35 #define GPIO_BANK(x) ((x) >> 5)
36 #define GPIO_PORT(x) (((x) >> 3) & 0x3)
37 #define GPIO_BIT(x) ((x) & 0x7)
39 #define GPIO_REG(x) (GPIO_BANK(x) * 0x80 + GPIO_PORT(x) * 4)
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)
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)
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
64 struct tegra_gpio_bank {
65 int bank;
66 int irq;
67 spinlock_t lvl_lock[4];
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
78 static void __iomem *regs;
79 static struct tegra_gpio_bank tegra_gpio_banks[7];
81 static inline void tegra_gpio_writel(u32 val, u32 reg)
83 __raw_writel(val, regs + reg);
86 static inline u32 tegra_gpio_readl(u32 reg)
88 return __raw_readl(regs + reg);
91 static int tegra_gpio_compose(int bank, int port, int bit)
93 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
96 static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
98 u32 val;
100 val = 0x100 << GPIO_BIT(gpio);
101 if (value)
102 val |= 1 << GPIO_BIT(gpio);
103 tegra_gpio_writel(val, reg);
106 void tegra_gpio_enable(int gpio)
108 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
111 void tegra_gpio_disable(int gpio)
113 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
116 static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
118 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
121 static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
123 return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
126 static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
128 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
129 return 0;
132 static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
133 int value)
135 tegra_gpio_set(chip, offset, value);
136 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
137 return 0;
140 static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
142 return TEGRA_GPIO_TO_IRQ(offset);
145 static 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,
151 .to_irq = tegra_gpio_to_irq,
152 .base = 0,
153 .ngpio = TEGRA_NR_GPIOS,
156 static void tegra_gpio_irq_ack(struct irq_data *d)
158 int gpio = d->irq - INT_GPIO_BASE;
160 tegra_gpio_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
163 static void tegra_gpio_irq_mask(struct irq_data *d)
165 int gpio = d->irq - INT_GPIO_BASE;
167 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
170 static void tegra_gpio_irq_unmask(struct irq_data *d)
172 int gpio = d->irq - INT_GPIO_BASE;
174 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
177 static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
179 int gpio = d->irq - INT_GPIO_BASE;
180 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
181 int port = GPIO_PORT(gpio);
182 int lvl_type;
183 int val;
184 unsigned long flags;
186 switch (type & IRQ_TYPE_SENSE_MASK) {
187 case IRQ_TYPE_EDGE_RISING:
188 lvl_type = GPIO_INT_LVL_EDGE_RISING;
189 break;
191 case IRQ_TYPE_EDGE_FALLING:
192 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
193 break;
195 case IRQ_TYPE_EDGE_BOTH:
196 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
197 break;
199 case IRQ_TYPE_LEVEL_HIGH:
200 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
201 break;
203 case IRQ_TYPE_LEVEL_LOW:
204 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
205 break;
207 default:
208 return -EINVAL;
211 spin_lock_irqsave(&bank->lvl_lock[port], flags);
213 val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
214 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
215 val |= lvl_type << GPIO_BIT(gpio);
216 tegra_gpio_writel(val, GPIO_INT_LVL(gpio));
218 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
220 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
221 __irq_set_handler_locked(d->irq, handle_level_irq);
222 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
223 __irq_set_handler_locked(d->irq, handle_edge_irq);
225 return 0;
228 static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
230 struct tegra_gpio_bank *bank;
231 int port;
232 int pin;
233 int unmasked = 0;
234 struct irq_chip *chip = irq_desc_get_chip(desc);
236 chained_irq_enter(chip, desc);
238 bank = irq_get_handler_data(irq);
240 for (port = 0; port < 4; port++) {
241 int gpio = tegra_gpio_compose(bank->bank, port, 0);
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));
246 for_each_set_bit(pin, &sta, 8) {
247 tegra_gpio_writel(1 << pin, GPIO_INT_CLR(gpio));
249 /* if gpio is edge triggered, clear condition
250 * before executing the hander so that we don't
251 * miss edges
253 if (lvl & (0x100 << pin)) {
254 unmasked = 1;
255 chained_irq_exit(chip, desc);
258 generic_handle_irq(gpio_to_irq(gpio + pin));
262 if (!unmasked)
263 chained_irq_exit(chip, desc);
267 #ifdef CONFIG_PM
268 void tegra_gpio_resume(void)
270 unsigned long flags;
271 int b;
272 int p;
274 local_irq_save(flags);
276 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
277 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
279 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
280 unsigned int gpio = (b<<5) | (p<<3);
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));
289 local_irq_restore(flags);
292 void tegra_gpio_suspend(void)
294 unsigned long flags;
295 int b;
296 int p;
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];
302 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
303 unsigned int gpio = (b<<5) | (p<<3);
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));
311 local_irq_restore(flags);
314 static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
316 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
317 return irq_set_irq_wake(bank->irq, enable);
319 #endif
321 static struct irq_chip tegra_gpio_irq_chip = {
322 .name = "GPIO",
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,
327 #ifdef CONFIG_PM
328 .irq_set_wake = tegra_gpio_wake_enable,
329 #endif
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.
336 static struct lock_class_key gpio_lock_class;
338 static int __devinit tegra_gpio_probe(struct platform_device *pdev)
340 struct resource *res;
341 struct tegra_gpio_bank *bank;
342 int gpio;
343 int i;
344 int j;
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;
353 bank = &tegra_gpio_banks[i];
354 bank->bank = i;
355 bank->irq = res->start;
358 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
359 if (!res) {
360 dev_err(&pdev->dev, "Missing MEM resource\n");
361 return -ENODEV;
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;
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;
377 for (i = 0; i < 7; i++) {
378 for (j = 0; j < 4; j++) {
379 int gpio = tegra_gpio_compose(i, j, 0);
380 tegra_gpio_writel(0x00, GPIO_INT_ENB(gpio));
384 #ifdef CONFIG_OF_GPIO
385 tegra_gpio_chip.of_node = pdev->dev.of_node;
386 #endif
388 gpiochip_add(&tegra_gpio_chip);
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 */
394 bank = &tegra_gpio_banks[GPIO_BANK(gpio)];
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,
399 handle_simple_irq);
400 set_irq_flags(irq, IRQF_VALID);
403 for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) {
404 bank = &tegra_gpio_banks[i];
406 irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler);
407 irq_set_handler_data(bank->irq, bank);
409 for (j = 0; j < 4; j++)
410 spin_lock_init(&bank->lvl_lock[j]);
413 return 0;
416 static struct of_device_id tegra_gpio_of_match[] __devinitdata = {
417 { .compatible = "nvidia,tegra20-gpio", },
418 { },
421 static struct platform_driver tegra_gpio_driver = {
422 .driver = {
423 .name = "tegra-gpio",
424 .owner = THIS_MODULE,
425 .of_match_table = tegra_gpio_of_match,
427 .probe = tegra_gpio_probe,
430 static int __init tegra_gpio_init(void)
432 return platform_driver_register(&tegra_gpio_driver);
434 postcore_initcall(tegra_gpio_init);
436 void __init tegra_gpio_config(struct tegra_gpio_table *table, int num)
438 int i;
440 for (i = 0; i < num; i++) {
441 int gpio = table[i].gpio;
443 if (table[i].enable)
444 tegra_gpio_enable(gpio);
445 else
446 tegra_gpio_disable(gpio);
450 #ifdef CONFIG_DEBUG_FS
452 #include <linux/debugfs.h>
453 #include <linux/seq_file.h>
455 static int dbg_gpio_show(struct seq_file *s, void *unused)
457 int i;
458 int j;
460 for (i = 0; i < 7; i++) {
461 for (j = 0; j < 4; j++) {
462 int gpio = tegra_gpio_compose(i, j, 0);
463 seq_printf(s,
464 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
465 i, j,
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)));
475 return 0;
478 static int dbg_gpio_open(struct inode *inode, struct file *file)
480 return single_open(file, dbg_gpio_show, &inode->i_private);
483 static const struct file_operations debug_fops = {
484 .open = dbg_gpio_open,
485 .read = seq_read,
486 .llseek = seq_lseek,
487 .release = single_release,
490 static int __init tegra_gpio_debuginit(void)
492 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
493 NULL, NULL, &debug_fops);
494 return 0;
496 late_initcall(tegra_gpio_debuginit);
497 #endif