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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 | |
24 | #include <linux/io.h> | |
25 | #include <linux/gpio.h> | |
26 | ||
27 | #include <mach/iomap.h> | |
2ea67fd1 | 28 | #include <mach/suspend.h> |
3c92db9a EG |
29 | |
30 | #define GPIO_BANK(x) ((x) >> 5) | |
31 | #define GPIO_PORT(x) (((x) >> 3) & 0x3) | |
32 | #define GPIO_BIT(x) ((x) & 0x7) | |
33 | ||
34 | #define GPIO_REG(x) (IO_TO_VIRT(TEGRA_GPIO_BASE) + \ | |
35 | GPIO_BANK(x) * 0x80 + \ | |
36 | GPIO_PORT(x) * 4) | |
37 | ||
38 | #define GPIO_CNF(x) (GPIO_REG(x) + 0x00) | |
39 | #define GPIO_OE(x) (GPIO_REG(x) + 0x10) | |
40 | #define GPIO_OUT(x) (GPIO_REG(x) + 0X20) | |
41 | #define GPIO_IN(x) (GPIO_REG(x) + 0x30) | |
42 | #define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40) | |
43 | #define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50) | |
44 | #define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60) | |
45 | #define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70) | |
46 | ||
47 | #define GPIO_MSK_CNF(x) (GPIO_REG(x) + 0x800) | |
48 | #define GPIO_MSK_OE(x) (GPIO_REG(x) + 0x810) | |
49 | #define GPIO_MSK_OUT(x) (GPIO_REG(x) + 0X820) | |
50 | #define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + 0x840) | |
51 | #define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + 0x850) | |
52 | #define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + 0x860) | |
53 | ||
54 | #define GPIO_INT_LVL_MASK 0x010101 | |
55 | #define GPIO_INT_LVL_EDGE_RISING 0x000101 | |
56 | #define GPIO_INT_LVL_EDGE_FALLING 0x000100 | |
57 | #define GPIO_INT_LVL_EDGE_BOTH 0x010100 | |
58 | #define GPIO_INT_LVL_LEVEL_HIGH 0x000001 | |
59 | #define GPIO_INT_LVL_LEVEL_LOW 0x000000 | |
60 | ||
61 | struct tegra_gpio_bank { | |
62 | int bank; | |
63 | int irq; | |
64 | spinlock_t lvl_lock[4]; | |
2e47b8b3 CC |
65 | #ifdef CONFIG_PM |
66 | u32 cnf[4]; | |
67 | u32 out[4]; | |
68 | u32 oe[4]; | |
69 | u32 int_enb[4]; | |
70 | u32 int_lvl[4]; | |
71 | #endif | |
3c92db9a EG |
72 | }; |
73 | ||
74 | ||
75 | static struct tegra_gpio_bank tegra_gpio_banks[] = { | |
76 | {.bank = 0, .irq = INT_GPIO1}, | |
77 | {.bank = 1, .irq = INT_GPIO2}, | |
78 | {.bank = 2, .irq = INT_GPIO3}, | |
79 | {.bank = 3, .irq = INT_GPIO4}, | |
80 | {.bank = 4, .irq = INT_GPIO5}, | |
81 | {.bank = 5, .irq = INT_GPIO6}, | |
82 | {.bank = 6, .irq = INT_GPIO7}, | |
83 | }; | |
84 | ||
85 | static int tegra_gpio_compose(int bank, int port, int bit) | |
86 | { | |
87 | return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7); | |
88 | } | |
89 | ||
90 | static void tegra_gpio_mask_write(u32 reg, int gpio, int value) | |
91 | { | |
92 | u32 val; | |
93 | ||
94 | val = 0x100 << GPIO_BIT(gpio); | |
95 | if (value) | |
96 | val |= 1 << GPIO_BIT(gpio); | |
97 | __raw_writel(val, reg); | |
98 | } | |
99 | ||
100 | void tegra_gpio_enable(int gpio) | |
101 | { | |
102 | tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1); | |
103 | } | |
104 | ||
105 | void tegra_gpio_disable(int gpio) | |
106 | { | |
107 | tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0); | |
108 | } | |
109 | ||
110 | static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
111 | { | |
112 | tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value); | |
113 | } | |
114 | ||
115 | static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset) | |
116 | { | |
117 | return (__raw_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1; | |
118 | } | |
119 | ||
120 | static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
121 | { | |
122 | tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset, | |
127 | int value) | |
128 | { | |
129 | tegra_gpio_set(chip, offset, value); | |
130 | tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | ||
135 | ||
136 | static struct gpio_chip tegra_gpio_chip = { | |
137 | .label = "tegra-gpio", | |
138 | .direction_input = tegra_gpio_direction_input, | |
139 | .get = tegra_gpio_get, | |
140 | .direction_output = tegra_gpio_direction_output, | |
141 | .set = tegra_gpio_set, | |
142 | .base = 0, | |
2e47b8b3 | 143 | .ngpio = TEGRA_NR_GPIOS, |
3c92db9a EG |
144 | }; |
145 | ||
37337a8d | 146 | static void tegra_gpio_irq_ack(struct irq_data *d) |
3c92db9a | 147 | { |
37337a8d | 148 | int gpio = d->irq - INT_GPIO_BASE; |
3c92db9a EG |
149 | |
150 | __raw_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio)); | |
151 | } | |
152 | ||
37337a8d | 153 | static void tegra_gpio_irq_mask(struct irq_data *d) |
3c92db9a | 154 | { |
37337a8d | 155 | int gpio = d->irq - INT_GPIO_BASE; |
3c92db9a EG |
156 | |
157 | tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0); | |
158 | } | |
159 | ||
37337a8d | 160 | static void tegra_gpio_irq_unmask(struct irq_data *d) |
3c92db9a | 161 | { |
37337a8d | 162 | int gpio = d->irq - INT_GPIO_BASE; |
3c92db9a EG |
163 | |
164 | tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1); | |
165 | } | |
166 | ||
37337a8d | 167 | static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
3c92db9a | 168 | { |
37337a8d LB |
169 | int gpio = d->irq - INT_GPIO_BASE; |
170 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); | |
3c92db9a EG |
171 | int port = GPIO_PORT(gpio); |
172 | int lvl_type; | |
173 | int val; | |
174 | unsigned long flags; | |
175 | ||
176 | switch (type & IRQ_TYPE_SENSE_MASK) { | |
177 | case IRQ_TYPE_EDGE_RISING: | |
178 | lvl_type = GPIO_INT_LVL_EDGE_RISING; | |
179 | break; | |
180 | ||
181 | case IRQ_TYPE_EDGE_FALLING: | |
182 | lvl_type = GPIO_INT_LVL_EDGE_FALLING; | |
183 | break; | |
184 | ||
185 | case IRQ_TYPE_EDGE_BOTH: | |
186 | lvl_type = GPIO_INT_LVL_EDGE_BOTH; | |
187 | break; | |
188 | ||
189 | case IRQ_TYPE_LEVEL_HIGH: | |
190 | lvl_type = GPIO_INT_LVL_LEVEL_HIGH; | |
191 | break; | |
192 | ||
193 | case IRQ_TYPE_LEVEL_LOW: | |
194 | lvl_type = GPIO_INT_LVL_LEVEL_LOW; | |
195 | break; | |
196 | ||
197 | default: | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | spin_lock_irqsave(&bank->lvl_lock[port], flags); | |
202 | ||
203 | val = __raw_readl(GPIO_INT_LVL(gpio)); | |
204 | val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio)); | |
205 | val |= lvl_type << GPIO_BIT(gpio); | |
206 | __raw_writel(val, GPIO_INT_LVL(gpio)); | |
207 | ||
208 | spin_unlock_irqrestore(&bank->lvl_lock[port], flags); | |
209 | ||
210 | if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) | |
6845664a | 211 | __irq_set_handler_locked(d->irq, handle_level_irq); |
3c92db9a | 212 | else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) |
6845664a | 213 | __irq_set_handler_locked(d->irq, handle_edge_irq); |
3c92db9a EG |
214 | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) | |
219 | { | |
220 | struct tegra_gpio_bank *bank; | |
221 | int port; | |
222 | int pin; | |
223 | int unmasked = 0; | |
224 | ||
37337a8d | 225 | desc->irq_data.chip->irq_ack(&desc->irq_data); |
3c92db9a | 226 | |
6845664a | 227 | bank = irq_get_handler_data(irq); |
3c92db9a EG |
228 | |
229 | for (port = 0; port < 4; port++) { | |
230 | int gpio = tegra_gpio_compose(bank->bank, port, 0); | |
231 | unsigned long sta = __raw_readl(GPIO_INT_STA(gpio)) & | |
232 | __raw_readl(GPIO_INT_ENB(gpio)); | |
233 | u32 lvl = __raw_readl(GPIO_INT_LVL(gpio)); | |
234 | ||
235 | for_each_set_bit(pin, &sta, 8) { | |
236 | __raw_writel(1 << pin, GPIO_INT_CLR(gpio)); | |
237 | ||
238 | /* if gpio is edge triggered, clear condition | |
239 | * before executing the hander so that we don't | |
240 | * miss edges | |
241 | */ | |
242 | if (lvl & (0x100 << pin)) { | |
243 | unmasked = 1; | |
37337a8d | 244 | desc->irq_data.chip->irq_unmask(&desc->irq_data); |
3c92db9a EG |
245 | } |
246 | ||
247 | generic_handle_irq(gpio_to_irq(gpio + pin)); | |
248 | } | |
249 | } | |
250 | ||
251 | if (!unmasked) | |
37337a8d | 252 | desc->irq_data.chip->irq_unmask(&desc->irq_data); |
3c92db9a EG |
253 | |
254 | } | |
255 | ||
2e47b8b3 CC |
256 | #ifdef CONFIG_PM |
257 | void tegra_gpio_resume(void) | |
258 | { | |
259 | unsigned long flags; | |
260 | int b, p, i; | |
261 | ||
262 | local_irq_save(flags); | |
263 | ||
264 | for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) { | |
265 | struct tegra_gpio_bank *bank = &tegra_gpio_banks[b]; | |
266 | ||
267 | for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { | |
268 | unsigned int gpio = (b<<5) | (p<<3); | |
269 | __raw_writel(bank->cnf[p], GPIO_CNF(gpio)); | |
270 | __raw_writel(bank->out[p], GPIO_OUT(gpio)); | |
271 | __raw_writel(bank->oe[p], GPIO_OE(gpio)); | |
272 | __raw_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio)); | |
273 | __raw_writel(bank->int_enb[p], GPIO_INT_ENB(gpio)); | |
274 | } | |
275 | } | |
276 | ||
277 | local_irq_restore(flags); | |
2e47b8b3 CC |
278 | } |
279 | ||
280 | void tegra_gpio_suspend(void) | |
281 | { | |
282 | unsigned long flags; | |
283 | int b, p, i; | |
284 | ||
2e47b8b3 CC |
285 | local_irq_save(flags); |
286 | for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) { | |
287 | struct tegra_gpio_bank *bank = &tegra_gpio_banks[b]; | |
288 | ||
289 | for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { | |
290 | unsigned int gpio = (b<<5) | (p<<3); | |
291 | bank->cnf[p] = __raw_readl(GPIO_CNF(gpio)); | |
292 | bank->out[p] = __raw_readl(GPIO_OUT(gpio)); | |
293 | bank->oe[p] = __raw_readl(GPIO_OE(gpio)); | |
294 | bank->int_enb[p] = __raw_readl(GPIO_INT_ENB(gpio)); | |
295 | bank->int_lvl[p] = __raw_readl(GPIO_INT_LVL(gpio)); | |
296 | } | |
297 | } | |
298 | local_irq_restore(flags); | |
299 | } | |
300 | ||
37337a8d | 301 | static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable) |
2e47b8b3 | 302 | { |
37337a8d | 303 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
6845664a | 304 | return irq_set_irq_wake(bank->irq, enable); |
2e47b8b3 CC |
305 | } |
306 | #endif | |
3c92db9a EG |
307 | |
308 | static struct irq_chip tegra_gpio_irq_chip = { | |
309 | .name = "GPIO", | |
37337a8d LB |
310 | .irq_ack = tegra_gpio_irq_ack, |
311 | .irq_mask = tegra_gpio_irq_mask, | |
312 | .irq_unmask = tegra_gpio_irq_unmask, | |
313 | .irq_set_type = tegra_gpio_irq_set_type, | |
2e47b8b3 | 314 | #ifdef CONFIG_PM |
37337a8d | 315 | .irq_set_wake = tegra_gpio_wake_enable, |
2e47b8b3 | 316 | #endif |
3c92db9a EG |
317 | }; |
318 | ||
319 | ||
320 | /* This lock class tells lockdep that GPIO irqs are in a different | |
321 | * category than their parents, so it won't report false recursion. | |
322 | */ | |
323 | static struct lock_class_key gpio_lock_class; | |
324 | ||
325 | static int __init tegra_gpio_init(void) | |
326 | { | |
327 | struct tegra_gpio_bank *bank; | |
328 | int i; | |
329 | int j; | |
330 | ||
331 | for (i = 0; i < 7; i++) { | |
332 | for (j = 0; j < 4; j++) { | |
333 | int gpio = tegra_gpio_compose(i, j, 0); | |
334 | __raw_writel(0x00, GPIO_INT_ENB(gpio)); | |
335 | } | |
336 | } | |
337 | ||
338 | gpiochip_add(&tegra_gpio_chip); | |
339 | ||
2e47b8b3 | 340 | for (i = INT_GPIO_BASE; i < (INT_GPIO_BASE + TEGRA_NR_GPIOS); i++) { |
3c92db9a EG |
341 | bank = &tegra_gpio_banks[GPIO_BANK(irq_to_gpio(i))]; |
342 | ||
1475b85d | 343 | irq_set_lockdep_class(i, &gpio_lock_class); |
6845664a TG |
344 | irq_set_chip_data(i, bank); |
345 | irq_set_chip(i, &tegra_gpio_irq_chip); | |
346 | irq_set_handler(i, handle_simple_irq); | |
3c92db9a EG |
347 | set_irq_flags(i, IRQF_VALID); |
348 | } | |
349 | ||
350 | for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) { | |
351 | bank = &tegra_gpio_banks[i]; | |
352 | ||
6845664a TG |
353 | irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler); |
354 | irq_set_handler_data(bank->irq, bank); | |
3c92db9a EG |
355 | |
356 | for (j = 0; j < 4; j++) | |
357 | spin_lock_init(&bank->lvl_lock[j]); | |
358 | } | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | postcore_initcall(tegra_gpio_init); | |
364 | ||
632095ea OJ |
365 | void __init tegra_gpio_config(struct tegra_gpio_table *table, int num) |
366 | { | |
367 | int i; | |
368 | ||
369 | for (i = 0; i < num; i++) { | |
370 | int gpio = table[i].gpio; | |
371 | ||
372 | if (table[i].enable) | |
373 | tegra_gpio_enable(gpio); | |
374 | else | |
375 | tegra_gpio_disable(gpio); | |
376 | } | |
377 | } | |
378 | ||
3c92db9a EG |
379 | #ifdef CONFIG_DEBUG_FS |
380 | ||
381 | #include <linux/debugfs.h> | |
382 | #include <linux/seq_file.h> | |
383 | ||
384 | static int dbg_gpio_show(struct seq_file *s, void *unused) | |
385 | { | |
386 | int i; | |
387 | int j; | |
388 | ||
389 | for (i = 0; i < 7; i++) { | |
390 | for (j = 0; j < 4; j++) { | |
391 | int gpio = tegra_gpio_compose(i, j, 0); | |
2e47b8b3 CC |
392 | seq_printf(s, |
393 | "%d:%d %02x %02x %02x %02x %02x %02x %06x\n", | |
394 | i, j, | |
395 | __raw_readl(GPIO_CNF(gpio)), | |
396 | __raw_readl(GPIO_OE(gpio)), | |
397 | __raw_readl(GPIO_OUT(gpio)), | |
398 | __raw_readl(GPIO_IN(gpio)), | |
399 | __raw_readl(GPIO_INT_STA(gpio)), | |
400 | __raw_readl(GPIO_INT_ENB(gpio)), | |
401 | __raw_readl(GPIO_INT_LVL(gpio))); | |
3c92db9a EG |
402 | } |
403 | } | |
404 | return 0; | |
405 | } | |
406 | ||
407 | static int dbg_gpio_open(struct inode *inode, struct file *file) | |
408 | { | |
409 | return single_open(file, dbg_gpio_show, &inode->i_private); | |
410 | } | |
411 | ||
412 | static const struct file_operations debug_fops = { | |
413 | .open = dbg_gpio_open, | |
414 | .read = seq_read, | |
415 | .llseek = seq_lseek, | |
416 | .release = single_release, | |
417 | }; | |
418 | ||
419 | static int __init tegra_gpio_debuginit(void) | |
420 | { | |
421 | (void) debugfs_create_file("tegra_gpio", S_IRUGO, | |
422 | NULL, NULL, &debug_fops); | |
423 | return 0; | |
424 | } | |
425 | late_initcall(tegra_gpio_debuginit); | |
426 | #endif |