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Merge branch 'v6v7' into devel
[linux/fpc-iii.git] / arch / arm / mach-tegra / gpio.c
blobad80488015136135443e3b1d59664b96a67b4fc6
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>
22 #include <linux/interrupt.h>
23
24 #include <linux/io.h>
25 #include <linux/gpio.h>
26
27 #include <mach/iomap.h>
28
29 #define GPIO_BANK(x) ((x) >> 5)
30 #define GPIO_PORT(x) (((x) >> 3) & 0x3)
31 #define GPIO_BIT(x) ((x) & 0x7)
32
33 #define GPIO_REG(x) (IO_TO_VIRT(TEGRA_GPIO_BASE) + \
34 GPIO_BANK(x) * 0x80 + \
35 GPIO_PORT(x) * 4)
36
37 #define GPIO_CNF(x) (GPIO_REG(x) + 0x00)
38 #define GPIO_OE(x) (GPIO_REG(x) + 0x10)
39 #define GPIO_OUT(x) (GPIO_REG(x) + 0X20)
40 #define GPIO_IN(x) (GPIO_REG(x) + 0x30)
41 #define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40)
42 #define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50)
43 #define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60)
44 #define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70)
45
46 #define GPIO_MSK_CNF(x) (GPIO_REG(x) + 0x800)
47 #define GPIO_MSK_OE(x) (GPIO_REG(x) + 0x810)
48 #define GPIO_MSK_OUT(x) (GPIO_REG(x) + 0X820)
49 #define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + 0x840)
50 #define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + 0x850)
51 #define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + 0x860)
52
53 #define GPIO_INT_LVL_MASK 0x010101
54 #define GPIO_INT_LVL_EDGE_RISING 0x000101
55 #define GPIO_INT_LVL_EDGE_FALLING 0x000100
56 #define GPIO_INT_LVL_EDGE_BOTH 0x010100
57 #define GPIO_INT_LVL_LEVEL_HIGH 0x000001
58 #define GPIO_INT_LVL_LEVEL_LOW 0x000000
59
60 struct tegra_gpio_bank {
61 int bank;
62 int irq;
63 spinlock_t lvl_lock[4];
64 #ifdef CONFIG_PM
65 u32 cnf[4];
66 u32 out[4];
67 u32 oe[4];
68 u32 int_enb[4];
69 u32 int_lvl[4];
70 #endif
71 };
72
73
74 static struct tegra_gpio_bank tegra_gpio_banks[] = {
75 {.bank = 0, .irq = INT_GPIO1},
76 {.bank = 1, .irq = INT_GPIO2},
77 {.bank = 2, .irq = INT_GPIO3},
78 {.bank = 3, .irq = INT_GPIO4},
79 {.bank = 4, .irq = INT_GPIO5},
80 {.bank = 5, .irq = INT_GPIO6},
81 {.bank = 6, .irq = INT_GPIO7},
82 };
83
84 static int tegra_gpio_compose(int bank, int port, int bit)
85 {
86 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
87 }
88
89 static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
90 {
91 u32 val;
92
93 val = 0x100 << GPIO_BIT(gpio);
94 if (value)
95 val |= 1 << GPIO_BIT(gpio);
96 __raw_writel(val, reg);
97 }
98
99 void tegra_gpio_enable(int gpio)
100 {
101 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
102 }
103
104 void tegra_gpio_disable(int gpio)
105 {
106 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
107 }
108
109 static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
110 {
111 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
112 }
113
114 static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
115 {
116 return (__raw_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
117 }
118
119 static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
120 {
121 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
122 return 0;
123 }
124
125 static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
126 int value)
127 {
128 tegra_gpio_set(chip, offset, value);
129 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
130 return 0;
131 }
132
133
134
135 static struct gpio_chip tegra_gpio_chip = {
136 .label = "tegra-gpio",
137 .direction_input = tegra_gpio_direction_input,
138 .get = tegra_gpio_get,
139 .direction_output = tegra_gpio_direction_output,
140 .set = tegra_gpio_set,
141 .base = 0,
142 .ngpio = TEGRA_NR_GPIOS,
143 };
144
145 static void tegra_gpio_irq_ack(struct irq_data *d)
146 {
147 int gpio = d->irq - INT_GPIO_BASE;
148
149 __raw_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
150 }
151
152 static void tegra_gpio_irq_mask(struct irq_data *d)
153 {
154 int gpio = d->irq - INT_GPIO_BASE;
155
156 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
157 }
158
159 static void tegra_gpio_irq_unmask(struct irq_data *d)
160 {
161 int gpio = d->irq - INT_GPIO_BASE;
162
163 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
164 }
165
166 static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
167 {
168 int gpio = d->irq - INT_GPIO_BASE;
169 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
170 int port = GPIO_PORT(gpio);
171 int lvl_type;
172 int val;
173 unsigned long flags;
174
175 switch (type & IRQ_TYPE_SENSE_MASK) {
176 case IRQ_TYPE_EDGE_RISING:
177 lvl_type = GPIO_INT_LVL_EDGE_RISING;
178 break;
179
180 case IRQ_TYPE_EDGE_FALLING:
181 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
182 break;
183
184 case IRQ_TYPE_EDGE_BOTH:
185 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
186 break;
187
188 case IRQ_TYPE_LEVEL_HIGH:
189 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
190 break;
191
192 case IRQ_TYPE_LEVEL_LOW:
193 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
194 break;
195
196 default:
197 return -EINVAL;
198 }
199
200 spin_lock_irqsave(&bank->lvl_lock[port], flags);
201
202 val = __raw_readl(GPIO_INT_LVL(gpio));
203 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
204 val |= lvl_type << GPIO_BIT(gpio);
205 __raw_writel(val, GPIO_INT_LVL(gpio));
206
207 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
208
209 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
210 __set_irq_handler_unlocked(d->irq, handle_level_irq);
211 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
212 __set_irq_handler_unlocked(d->irq, handle_edge_irq);
213
214 return 0;
215 }
216
217 static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
218 {
219 struct tegra_gpio_bank *bank;
220 int port;
221 int pin;
222 int unmasked = 0;
223
224 desc->irq_data.chip->irq_ack(&desc->irq_data);
225
226 bank = get_irq_data(irq);
227
228 for (port = 0; port < 4; port++) {
229 int gpio = tegra_gpio_compose(bank->bank, port, 0);
230 unsigned long sta = __raw_readl(GPIO_INT_STA(gpio)) &
231 __raw_readl(GPIO_INT_ENB(gpio));
232 u32 lvl = __raw_readl(GPIO_INT_LVL(gpio));
233
234 for_each_set_bit(pin, &sta, 8) {
235 __raw_writel(1 << pin, GPIO_INT_CLR(gpio));
236
237 /* if gpio is edge triggered, clear condition
238 * before executing the hander so that we don't
239 * miss edges
240 */
241 if (lvl & (0x100 << pin)) {
242 unmasked = 1;
243 desc->irq_data.chip->irq_unmask(&desc->irq_data);
244 }
245
246 generic_handle_irq(gpio_to_irq(gpio + pin));
247 }
248 }
249
250 if (!unmasked)
251 desc->irq_data.chip->irq_unmask(&desc->irq_data);
252
253 }
254
255 #ifdef CONFIG_PM
256 void tegra_gpio_resume(void)
257 {
258 unsigned long flags;
259 int b, p, i;
260
261 local_irq_save(flags);
262
263 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
264 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
265
266 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
267 unsigned int gpio = (b<<5) | (p<<3);
268 __raw_writel(bank->cnf[p], GPIO_CNF(gpio));
269 __raw_writel(bank->out[p], GPIO_OUT(gpio));
270 __raw_writel(bank->oe[p], GPIO_OE(gpio));
271 __raw_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
272 __raw_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
273 }
274 }
275
276 local_irq_restore(flags);
277
278 for (i = INT_GPIO_BASE; i < (INT_GPIO_BASE + TEGRA_NR_GPIOS); i++) {
279 struct irq_desc *desc = irq_to_desc(i);
280 if (!desc || (desc->status & IRQ_WAKEUP))
281 continue;
282 enable_irq(i);
283 }
284 }
285
286 void tegra_gpio_suspend(void)
287 {
288 unsigned long flags;
289 int b, p, i;
290
291 for (i = INT_GPIO_BASE; i < (INT_GPIO_BASE + TEGRA_NR_GPIOS); i++) {
292 struct irq_desc *desc = irq_to_desc(i);
293 if (!desc)
294 continue;
295 if (desc->status & IRQ_WAKEUP) {
296 int gpio = i - INT_GPIO_BASE;
297 pr_debug("gpio %d.%d is wakeup\n", gpio/8, gpio&7);
298 continue;
299 }
300 disable_irq(i);
301 }
302
303 local_irq_save(flags);
304 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
305 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
306
307 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
308 unsigned int gpio = (b<<5) | (p<<3);
309 bank->cnf[p] = __raw_readl(GPIO_CNF(gpio));
310 bank->out[p] = __raw_readl(GPIO_OUT(gpio));
311 bank->oe[p] = __raw_readl(GPIO_OE(gpio));
312 bank->int_enb[p] = __raw_readl(GPIO_INT_ENB(gpio));
313 bank->int_lvl[p] = __raw_readl(GPIO_INT_LVL(gpio));
314 }
315 }
316 local_irq_restore(flags);
317 }
318
319 static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
320 {
321 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
322 return set_irq_wake(bank->irq, enable);
323 }
324 #endif
325
326 static struct irq_chip tegra_gpio_irq_chip = {
327 .name = "GPIO",
328 .irq_ack = tegra_gpio_irq_ack,
329 .irq_mask = tegra_gpio_irq_mask,
330 .irq_unmask = tegra_gpio_irq_unmask,
331 .irq_set_type = tegra_gpio_irq_set_type,
332 #ifdef CONFIG_PM
333 .irq_set_wake = tegra_gpio_wake_enable,
334 #endif
335 };
336
337
338 /* This lock class tells lockdep that GPIO irqs are in a different
339 * category than their parents, so it won't report false recursion.
340 */
341 static struct lock_class_key gpio_lock_class;
342
343 static int __init tegra_gpio_init(void)
344 {
345 struct tegra_gpio_bank *bank;
346 int i;
347 int j;
348
349 for (i = 0; i < 7; i++) {
350 for (j = 0; j < 4; j++) {
351 int gpio = tegra_gpio_compose(i, j, 0);
352 __raw_writel(0x00, GPIO_INT_ENB(gpio));
353 }
354 }
355
356 gpiochip_add(&tegra_gpio_chip);
357
358 for (i = INT_GPIO_BASE; i < (INT_GPIO_BASE + TEGRA_NR_GPIOS); i++) {
359 bank = &tegra_gpio_banks[GPIO_BANK(irq_to_gpio(i))];
360
361 lockdep_set_class(&irq_desc[i].lock, &gpio_lock_class);
362 set_irq_chip_data(i, bank);
363 set_irq_chip(i, &tegra_gpio_irq_chip);
364 set_irq_handler(i, handle_simple_irq);
365 set_irq_flags(i, IRQF_VALID);
366 }
367
368 for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) {
369 bank = &tegra_gpio_banks[i];
370
371 set_irq_chained_handler(bank->irq, tegra_gpio_irq_handler);
372 set_irq_data(bank->irq, bank);
373
374 for (j = 0; j < 4; j++)
375 spin_lock_init(&bank->lvl_lock[j]);
376 }
377
378 return 0;
379 }
380
381 postcore_initcall(tegra_gpio_init);
382
383 #ifdef CONFIG_DEBUG_FS
384
385 #include <linux/debugfs.h>
386 #include <linux/seq_file.h>
387
388 static int dbg_gpio_show(struct seq_file *s, void *unused)
389 {
390 int i;
391 int j;
392
393 for (i = 0; i < 7; i++) {
394 for (j = 0; j < 4; j++) {
395 int gpio = tegra_gpio_compose(i, j, 0);
396 seq_printf(s,
397 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
398 i, j,
399 __raw_readl(GPIO_CNF(gpio)),
400 __raw_readl(GPIO_OE(gpio)),
401 __raw_readl(GPIO_OUT(gpio)),
402 __raw_readl(GPIO_IN(gpio)),
403 __raw_readl(GPIO_INT_STA(gpio)),
404 __raw_readl(GPIO_INT_ENB(gpio)),
405 __raw_readl(GPIO_INT_LVL(gpio)));
406 }
407 }
408 return 0;
409 }
410
411 static int dbg_gpio_open(struct inode *inode, struct file *file)
412 {
413 return single_open(file, dbg_gpio_show, &inode->i_private);
414 }
415
416 static const struct file_operations debug_fops = {
417 .open = dbg_gpio_open,
418 .read = seq_read,
419 .llseek = seq_lseek,
420 .release = single_release,
421 };
422
423 static int __init tegra_gpio_debuginit(void)
424 {
425 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
426 NULL, NULL, &debug_fops);
427 return 0;
428 }
429 late_initcall(tegra_gpio_debuginit);
430 #endif
Linux with added FPC-III support