Commit | Line | Data |
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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 | ||
641d0342 | 20 | #include <linux/err.h> |
3c92db9a EG |
21 | #include <linux/init.h> |
22 | #include <linux/irq.h> | |
2e47b8b3 | 23 | #include <linux/interrupt.h> |
3c92db9a EG |
24 | #include <linux/io.h> |
25 | #include <linux/gpio.h> | |
5c1e2c9d | 26 | #include <linux/of_device.h> |
88d8951e SW |
27 | #include <linux/platform_device.h> |
28 | #include <linux/module.h> | |
6f74dc9b | 29 | #include <linux/irqdomain.h> |
de88cbb7 | 30 | #include <linux/irqchip/chained_irq.h> |
3e215d0a | 31 | #include <linux/pinctrl/consumer.h> |
8939ddc7 | 32 | #include <linux/pm.h> |
3c92db9a | 33 | |
3c92db9a EG |
34 | #define GPIO_BANK(x) ((x) >> 5) |
35 | #define GPIO_PORT(x) (((x) >> 3) & 0x3) | |
36 | #define GPIO_BIT(x) ((x) & 0x7) | |
37 | ||
b546be0d | 38 | #define GPIO_REG(tgi, x) (GPIO_BANK(x) * tgi->soc->bank_stride + \ |
5c1e2c9d | 39 | GPIO_PORT(x) * 4) |
3c92db9a | 40 | |
b546be0d LD |
41 | #define GPIO_CNF(t, x) (GPIO_REG(t, x) + 0x00) |
42 | #define GPIO_OE(t, x) (GPIO_REG(t, x) + 0x10) | |
43 | #define GPIO_OUT(t, x) (GPIO_REG(t, x) + 0X20) | |
44 | #define GPIO_IN(t, x) (GPIO_REG(t, x) + 0x30) | |
45 | #define GPIO_INT_STA(t, x) (GPIO_REG(t, x) + 0x40) | |
46 | #define GPIO_INT_ENB(t, x) (GPIO_REG(t, x) + 0x50) | |
47 | #define GPIO_INT_LVL(t, x) (GPIO_REG(t, x) + 0x60) | |
48 | #define GPIO_INT_CLR(t, x) (GPIO_REG(t, x) + 0x70) | |
3737de42 LD |
49 | #define GPIO_DBC_CNT(t, x) (GPIO_REG(t, x) + 0xF0) |
50 | ||
b546be0d LD |
51 | |
52 | #define GPIO_MSK_CNF(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x00) | |
53 | #define GPIO_MSK_OE(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x10) | |
54 | #define GPIO_MSK_OUT(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0X20) | |
3737de42 | 55 | #define GPIO_MSK_DBC_EN(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x30) |
b546be0d LD |
56 | #define GPIO_MSK_INT_STA(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x40) |
57 | #define GPIO_MSK_INT_ENB(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x50) | |
58 | #define GPIO_MSK_INT_LVL(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x60) | |
3c92db9a EG |
59 | |
60 | #define GPIO_INT_LVL_MASK 0x010101 | |
61 | #define GPIO_INT_LVL_EDGE_RISING 0x000101 | |
62 | #define GPIO_INT_LVL_EDGE_FALLING 0x000100 | |
63 | #define GPIO_INT_LVL_EDGE_BOTH 0x010100 | |
64 | #define GPIO_INT_LVL_LEVEL_HIGH 0x000001 | |
65 | #define GPIO_INT_LVL_LEVEL_LOW 0x000000 | |
66 | ||
b546be0d LD |
67 | struct tegra_gpio_info; |
68 | ||
3c92db9a EG |
69 | struct tegra_gpio_bank { |
70 | int bank; | |
71 | int irq; | |
72 | spinlock_t lvl_lock[4]; | |
3737de42 | 73 | spinlock_t dbc_lock[4]; /* Lock for updating debounce count register */ |
8939ddc7 | 74 | #ifdef CONFIG_PM_SLEEP |
2e47b8b3 CC |
75 | u32 cnf[4]; |
76 | u32 out[4]; | |
77 | u32 oe[4]; | |
78 | u32 int_enb[4]; | |
79 | u32 int_lvl[4]; | |
203f31cb | 80 | u32 wake_enb[4]; |
3737de42 | 81 | u32 dbc_enb[4]; |
2e47b8b3 | 82 | #endif |
3737de42 | 83 | u32 dbc_cnt[4]; |
b546be0d | 84 | struct tegra_gpio_info *tgi; |
3c92db9a EG |
85 | }; |
86 | ||
171b92c8 | 87 | struct tegra_gpio_soc_config { |
3737de42 | 88 | bool debounce_supported; |
171b92c8 LD |
89 | u32 bank_stride; |
90 | u32 upper_offset; | |
91 | }; | |
92 | ||
b546be0d LD |
93 | struct tegra_gpio_info { |
94 | struct device *dev; | |
95 | void __iomem *regs; | |
96 | struct irq_domain *irq_domain; | |
97 | struct tegra_gpio_bank *bank_info; | |
98 | const struct tegra_gpio_soc_config *soc; | |
99 | struct gpio_chip gc; | |
100 | struct irq_chip ic; | |
b546be0d LD |
101 | u32 bank_count; |
102 | }; | |
88d8951e | 103 | |
b546be0d LD |
104 | static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi, |
105 | u32 val, u32 reg) | |
88d8951e | 106 | { |
b546be0d | 107 | __raw_writel(val, tgi->regs + reg); |
88d8951e SW |
108 | } |
109 | ||
b546be0d | 110 | static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg) |
88d8951e | 111 | { |
b546be0d | 112 | return __raw_readl(tgi->regs + reg); |
88d8951e | 113 | } |
3c92db9a EG |
114 | |
115 | static int tegra_gpio_compose(int bank, int port, int bit) | |
116 | { | |
117 | return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7); | |
118 | } | |
119 | ||
b546be0d LD |
120 | static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg, |
121 | int gpio, int value) | |
3c92db9a EG |
122 | { |
123 | u32 val; | |
124 | ||
125 | val = 0x100 << GPIO_BIT(gpio); | |
126 | if (value) | |
127 | val |= 1 << GPIO_BIT(gpio); | |
b546be0d | 128 | tegra_gpio_writel(tgi, val, reg); |
3c92db9a EG |
129 | } |
130 | ||
b546be0d | 131 | static void tegra_gpio_enable(struct tegra_gpio_info *tgi, int gpio) |
3c92db9a | 132 | { |
b546be0d | 133 | tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1); |
3c92db9a EG |
134 | } |
135 | ||
b546be0d | 136 | static void tegra_gpio_disable(struct tegra_gpio_info *tgi, int gpio) |
3c92db9a | 137 | { |
b546be0d | 138 | tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0); |
3c92db9a EG |
139 | } |
140 | ||
924a0987 | 141 | static int tegra_gpio_request(struct gpio_chip *chip, unsigned offset) |
3e215d0a SW |
142 | { |
143 | return pinctrl_request_gpio(offset); | |
144 | } | |
145 | ||
924a0987 | 146 | static void tegra_gpio_free(struct gpio_chip *chip, unsigned offset) |
3e215d0a | 147 | { |
b546be0d LD |
148 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
149 | ||
3e215d0a | 150 | pinctrl_free_gpio(offset); |
b546be0d | 151 | tegra_gpio_disable(tgi, offset); |
3e215d0a SW |
152 | } |
153 | ||
3c92db9a EG |
154 | static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
155 | { | |
b546be0d LD |
156 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
157 | ||
158 | tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value); | |
3c92db9a EG |
159 | } |
160 | ||
161 | static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset) | |
162 | { | |
b546be0d LD |
163 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
164 | int bval = BIT(GPIO_BIT(offset)); | |
165 | ||
195812e4 | 166 | /* If gpio is in output mode then read from the out value */ |
b546be0d LD |
167 | if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval) |
168 | return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval); | |
195812e4 | 169 | |
b546be0d | 170 | return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval); |
3c92db9a EG |
171 | } |
172 | ||
173 | static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
174 | { | |
b546be0d LD |
175 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
176 | ||
177 | tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0); | |
178 | tegra_gpio_enable(tgi, offset); | |
3c92db9a EG |
179 | return 0; |
180 | } | |
181 | ||
182 | static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset, | |
183 | int value) | |
184 | { | |
b546be0d LD |
185 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
186 | ||
3c92db9a | 187 | tegra_gpio_set(chip, offset, value); |
b546be0d LD |
188 | tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1); |
189 | tegra_gpio_enable(tgi, offset); | |
3c92db9a EG |
190 | return 0; |
191 | } | |
192 | ||
f002d07c LD |
193 | static int tegra_gpio_get_direction(struct gpio_chip *chip, unsigned offset) |
194 | { | |
195 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); | |
196 | u32 pin_mask = BIT(GPIO_BIT(offset)); | |
197 | u32 cnf, oe; | |
198 | ||
199 | cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset)); | |
200 | if (!(cnf & pin_mask)) | |
201 | return -EINVAL; | |
202 | ||
203 | oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)); | |
204 | ||
205 | return (oe & pin_mask) ? GPIOF_DIR_OUT : GPIOF_DIR_IN; | |
206 | } | |
207 | ||
3737de42 LD |
208 | static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset, |
209 | unsigned int debounce) | |
210 | { | |
211 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); | |
212 | struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)]; | |
213 | unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000); | |
214 | unsigned long flags; | |
215 | int port; | |
216 | ||
217 | if (!debounce_ms) { | |
218 | tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), | |
219 | offset, 0); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | debounce_ms = min(debounce_ms, 255U); | |
224 | port = GPIO_PORT(offset); | |
225 | ||
226 | /* There is only one debounce count register per port and hence | |
227 | * set the maximum of current and requested debounce time. | |
228 | */ | |
229 | spin_lock_irqsave(&bank->dbc_lock[port], flags); | |
230 | if (bank->dbc_cnt[port] < debounce_ms) { | |
231 | tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset)); | |
232 | bank->dbc_cnt[port] = debounce_ms; | |
233 | } | |
234 | spin_unlock_irqrestore(&bank->dbc_lock[port], flags); | |
235 | ||
236 | tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
2956b5d9 MW |
241 | static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
242 | unsigned long config) | |
243 | { | |
244 | u32 debounce; | |
245 | ||
246 | if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) | |
247 | return -ENOTSUPP; | |
248 | ||
249 | debounce = pinconf_to_config_argument(config); | |
250 | return tegra_gpio_set_debounce(chip, offset, debounce); | |
251 | } | |
252 | ||
438a99c0 SW |
253 | static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
254 | { | |
b546be0d | 255 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
3c92db9a | 256 | |
b546be0d LD |
257 | return irq_find_mapping(tgi->irq_domain, offset); |
258 | } | |
3c92db9a | 259 | |
37337a8d | 260 | static void tegra_gpio_irq_ack(struct irq_data *d) |
3c92db9a | 261 | { |
b546be0d LD |
262 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
263 | struct tegra_gpio_info *tgi = bank->tgi; | |
6f74dc9b | 264 | int gpio = d->hwirq; |
3c92db9a | 265 | |
b546be0d | 266 | tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio)); |
3c92db9a EG |
267 | } |
268 | ||
37337a8d | 269 | static void tegra_gpio_irq_mask(struct irq_data *d) |
3c92db9a | 270 | { |
b546be0d LD |
271 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
272 | struct tegra_gpio_info *tgi = bank->tgi; | |
6f74dc9b | 273 | int gpio = d->hwirq; |
3c92db9a | 274 | |
b546be0d | 275 | tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0); |
3c92db9a EG |
276 | } |
277 | ||
37337a8d | 278 | static void tegra_gpio_irq_unmask(struct irq_data *d) |
3c92db9a | 279 | { |
b546be0d LD |
280 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
281 | struct tegra_gpio_info *tgi = bank->tgi; | |
6f74dc9b | 282 | int gpio = d->hwirq; |
3c92db9a | 283 | |
b546be0d | 284 | tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1); |
3c92db9a EG |
285 | } |
286 | ||
37337a8d | 287 | static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
3c92db9a | 288 | { |
6f74dc9b | 289 | int gpio = d->hwirq; |
37337a8d | 290 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
b546be0d | 291 | struct tegra_gpio_info *tgi = bank->tgi; |
3c92db9a EG |
292 | int port = GPIO_PORT(gpio); |
293 | int lvl_type; | |
294 | int val; | |
295 | unsigned long flags; | |
df231f28 | 296 | int ret; |
3c92db9a EG |
297 | |
298 | switch (type & IRQ_TYPE_SENSE_MASK) { | |
299 | case IRQ_TYPE_EDGE_RISING: | |
300 | lvl_type = GPIO_INT_LVL_EDGE_RISING; | |
301 | break; | |
302 | ||
303 | case IRQ_TYPE_EDGE_FALLING: | |
304 | lvl_type = GPIO_INT_LVL_EDGE_FALLING; | |
305 | break; | |
306 | ||
307 | case IRQ_TYPE_EDGE_BOTH: | |
308 | lvl_type = GPIO_INT_LVL_EDGE_BOTH; | |
309 | break; | |
310 | ||
311 | case IRQ_TYPE_LEVEL_HIGH: | |
312 | lvl_type = GPIO_INT_LVL_LEVEL_HIGH; | |
313 | break; | |
314 | ||
315 | case IRQ_TYPE_LEVEL_LOW: | |
316 | lvl_type = GPIO_INT_LVL_LEVEL_LOW; | |
317 | break; | |
318 | ||
319 | default: | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
b546be0d | 323 | ret = gpiochip_lock_as_irq(&tgi->gc, gpio); |
df231f28 | 324 | if (ret) { |
b546be0d LD |
325 | dev_err(tgi->dev, |
326 | "unable to lock Tegra GPIO %d as IRQ\n", gpio); | |
df231f28 SW |
327 | return ret; |
328 | } | |
329 | ||
3c92db9a EG |
330 | spin_lock_irqsave(&bank->lvl_lock[port], flags); |
331 | ||
b546be0d | 332 | val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); |
3c92db9a EG |
333 | val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio)); |
334 | val |= lvl_type << GPIO_BIT(gpio); | |
b546be0d | 335 | tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio)); |
3c92db9a EG |
336 | |
337 | spin_unlock_irqrestore(&bank->lvl_lock[port], flags); | |
338 | ||
b546be0d LD |
339 | tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0); |
340 | tegra_gpio_enable(tgi, gpio); | |
d941136f | 341 | |
3c92db9a | 342 | if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) |
f170d71e | 343 | irq_set_handler_locked(d, handle_level_irq); |
3c92db9a | 344 | else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) |
f170d71e | 345 | irq_set_handler_locked(d, handle_edge_irq); |
3c92db9a EG |
346 | |
347 | return 0; | |
348 | } | |
349 | ||
df231f28 SW |
350 | static void tegra_gpio_irq_shutdown(struct irq_data *d) |
351 | { | |
b546be0d LD |
352 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
353 | struct tegra_gpio_info *tgi = bank->tgi; | |
df231f28 SW |
354 | int gpio = d->hwirq; |
355 | ||
b546be0d | 356 | gpiochip_unlock_as_irq(&tgi->gc, gpio); |
df231f28 SW |
357 | } |
358 | ||
bd0b9ac4 | 359 | static void tegra_gpio_irq_handler(struct irq_desc *desc) |
3c92db9a | 360 | { |
3c92db9a EG |
361 | int port; |
362 | int pin; | |
9e9509e3 | 363 | bool unmasked = false; |
b546be0d LD |
364 | int gpio; |
365 | u32 lvl; | |
366 | unsigned long sta; | |
98022940 | 367 | struct irq_chip *chip = irq_desc_get_chip(desc); |
476f8b4c | 368 | struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc); |
b546be0d | 369 | struct tegra_gpio_info *tgi = bank->tgi; |
3c92db9a | 370 | |
98022940 | 371 | chained_irq_enter(chip, desc); |
3c92db9a | 372 | |
3c92db9a | 373 | for (port = 0; port < 4; port++) { |
b546be0d LD |
374 | gpio = tegra_gpio_compose(bank->bank, port, 0); |
375 | sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) & | |
376 | tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)); | |
377 | lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); | |
3c92db9a EG |
378 | |
379 | for_each_set_bit(pin, &sta, 8) { | |
b546be0d LD |
380 | tegra_gpio_writel(tgi, 1 << pin, |
381 | GPIO_INT_CLR(tgi, gpio)); | |
3c92db9a EG |
382 | |
383 | /* if gpio is edge triggered, clear condition | |
20a8a968 | 384 | * before executing the handler so that we don't |
3c92db9a EG |
385 | * miss edges |
386 | */ | |
9e9509e3 MM |
387 | if (!unmasked && lvl & (0x100 << pin)) { |
388 | unmasked = true; | |
98022940 | 389 | chained_irq_exit(chip, desc); |
3c92db9a EG |
390 | } |
391 | ||
c0debb3d GS |
392 | generic_handle_irq(irq_find_mapping(tgi->irq_domain, |
393 | gpio + pin)); | |
3c92db9a EG |
394 | } |
395 | } | |
396 | ||
397 | if (!unmasked) | |
98022940 | 398 | chained_irq_exit(chip, desc); |
3c92db9a EG |
399 | |
400 | } | |
401 | ||
8939ddc7 LD |
402 | #ifdef CONFIG_PM_SLEEP |
403 | static int tegra_gpio_resume(struct device *dev) | |
2e47b8b3 | 404 | { |
b546be0d LD |
405 | struct platform_device *pdev = to_platform_device(dev); |
406 | struct tegra_gpio_info *tgi = platform_get_drvdata(pdev); | |
2e47b8b3 | 407 | unsigned long flags; |
c8309ef6 CC |
408 | int b; |
409 | int p; | |
2e47b8b3 CC |
410 | |
411 | local_irq_save(flags); | |
412 | ||
b546be0d LD |
413 | for (b = 0; b < tgi->bank_count; b++) { |
414 | struct tegra_gpio_bank *bank = &tgi->bank_info[b]; | |
2e47b8b3 CC |
415 | |
416 | for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { | |
417 | unsigned int gpio = (b<<5) | (p<<3); | |
b546be0d LD |
418 | tegra_gpio_writel(tgi, bank->cnf[p], |
419 | GPIO_CNF(tgi, gpio)); | |
3737de42 LD |
420 | |
421 | if (tgi->soc->debounce_supported) { | |
422 | tegra_gpio_writel(tgi, bank->dbc_cnt[p], | |
423 | GPIO_DBC_CNT(tgi, gpio)); | |
424 | tegra_gpio_writel(tgi, bank->dbc_enb[p], | |
425 | GPIO_MSK_DBC_EN(tgi, gpio)); | |
426 | } | |
427 | ||
b546be0d LD |
428 | tegra_gpio_writel(tgi, bank->out[p], |
429 | GPIO_OUT(tgi, gpio)); | |
430 | tegra_gpio_writel(tgi, bank->oe[p], | |
431 | GPIO_OE(tgi, gpio)); | |
432 | tegra_gpio_writel(tgi, bank->int_lvl[p], | |
433 | GPIO_INT_LVL(tgi, gpio)); | |
434 | tegra_gpio_writel(tgi, bank->int_enb[p], | |
435 | GPIO_INT_ENB(tgi, gpio)); | |
2e47b8b3 CC |
436 | } |
437 | } | |
438 | ||
439 | local_irq_restore(flags); | |
8939ddc7 | 440 | return 0; |
2e47b8b3 CC |
441 | } |
442 | ||
8939ddc7 | 443 | static int tegra_gpio_suspend(struct device *dev) |
2e47b8b3 | 444 | { |
b546be0d LD |
445 | struct platform_device *pdev = to_platform_device(dev); |
446 | struct tegra_gpio_info *tgi = platform_get_drvdata(pdev); | |
2e47b8b3 | 447 | unsigned long flags; |
c8309ef6 CC |
448 | int b; |
449 | int p; | |
2e47b8b3 | 450 | |
2e47b8b3 | 451 | local_irq_save(flags); |
b546be0d LD |
452 | for (b = 0; b < tgi->bank_count; b++) { |
453 | struct tegra_gpio_bank *bank = &tgi->bank_info[b]; | |
2e47b8b3 CC |
454 | |
455 | for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { | |
456 | unsigned int gpio = (b<<5) | (p<<3); | |
b546be0d LD |
457 | bank->cnf[p] = tegra_gpio_readl(tgi, |
458 | GPIO_CNF(tgi, gpio)); | |
459 | bank->out[p] = tegra_gpio_readl(tgi, | |
460 | GPIO_OUT(tgi, gpio)); | |
461 | bank->oe[p] = tegra_gpio_readl(tgi, | |
462 | GPIO_OE(tgi, gpio)); | |
3737de42 LD |
463 | if (tgi->soc->debounce_supported) { |
464 | bank->dbc_enb[p] = tegra_gpio_readl(tgi, | |
465 | GPIO_MSK_DBC_EN(tgi, gpio)); | |
466 | bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) | | |
467 | bank->dbc_enb[p]; | |
468 | } | |
469 | ||
b546be0d LD |
470 | bank->int_enb[p] = tegra_gpio_readl(tgi, |
471 | GPIO_INT_ENB(tgi, gpio)); | |
472 | bank->int_lvl[p] = tegra_gpio_readl(tgi, | |
473 | GPIO_INT_LVL(tgi, gpio)); | |
203f31cb JL |
474 | |
475 | /* Enable gpio irq for wake up source */ | |
b546be0d LD |
476 | tegra_gpio_writel(tgi, bank->wake_enb[p], |
477 | GPIO_INT_ENB(tgi, gpio)); | |
2e47b8b3 CC |
478 | } |
479 | } | |
480 | local_irq_restore(flags); | |
8939ddc7 | 481 | return 0; |
2e47b8b3 CC |
482 | } |
483 | ||
203f31cb | 484 | static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) |
2e47b8b3 | 485 | { |
37337a8d | 486 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
203f31cb JL |
487 | int gpio = d->hwirq; |
488 | u32 port, bit, mask; | |
489 | ||
490 | port = GPIO_PORT(gpio); | |
491 | bit = GPIO_BIT(gpio); | |
492 | mask = BIT(bit); | |
493 | ||
494 | if (enable) | |
495 | bank->wake_enb[port] |= mask; | |
496 | else | |
497 | bank->wake_enb[port] &= ~mask; | |
498 | ||
6845664a | 499 | return irq_set_irq_wake(bank->irq, enable); |
2e47b8b3 CC |
500 | } |
501 | #endif | |
3c92db9a | 502 | |
b59d5fb7 SP |
503 | #ifdef CONFIG_DEBUG_FS |
504 | ||
505 | #include <linux/debugfs.h> | |
506 | #include <linux/seq_file.h> | |
507 | ||
508 | static int dbg_gpio_show(struct seq_file *s, void *unused) | |
509 | { | |
b546be0d | 510 | struct tegra_gpio_info *tgi = s->private; |
b59d5fb7 SP |
511 | int i; |
512 | int j; | |
513 | ||
b546be0d | 514 | for (i = 0; i < tgi->bank_count; i++) { |
b59d5fb7 SP |
515 | for (j = 0; j < 4; j++) { |
516 | int gpio = tegra_gpio_compose(i, j, 0); | |
517 | seq_printf(s, | |
518 | "%d:%d %02x %02x %02x %02x %02x %02x %06x\n", | |
519 | i, j, | |
b546be0d LD |
520 | tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)), |
521 | tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)), | |
522 | tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)), | |
523 | tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)), | |
524 | tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)), | |
525 | tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)), | |
526 | tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio))); | |
b59d5fb7 SP |
527 | } |
528 | } | |
529 | return 0; | |
530 | } | |
531 | ||
532 | static int dbg_gpio_open(struct inode *inode, struct file *file) | |
533 | { | |
b546be0d | 534 | return single_open(file, dbg_gpio_show, inode->i_private); |
b59d5fb7 SP |
535 | } |
536 | ||
537 | static const struct file_operations debug_fops = { | |
538 | .open = dbg_gpio_open, | |
539 | .read = seq_read, | |
540 | .llseek = seq_lseek, | |
541 | .release = single_release, | |
542 | }; | |
543 | ||
b546be0d | 544 | static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) |
b59d5fb7 SP |
545 | { |
546 | (void) debugfs_create_file("tegra_gpio", S_IRUGO, | |
b546be0d | 547 | NULL, tgi, &debug_fops); |
b59d5fb7 SP |
548 | } |
549 | ||
550 | #else | |
551 | ||
b546be0d | 552 | static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) |
b59d5fb7 SP |
553 | { |
554 | } | |
555 | ||
556 | #endif | |
557 | ||
8939ddc7 LD |
558 | static const struct dev_pm_ops tegra_gpio_pm_ops = { |
559 | SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume) | |
560 | }; | |
561 | ||
9ee8ff48 TR |
562 | /* |
563 | * This lock class tells lockdep that GPIO irqs are in a different category | |
564 | * than their parents, so it won't report false recursion. | |
565 | */ | |
566 | static struct lock_class_key gpio_lock_class; | |
567 | ||
3836309d | 568 | static int tegra_gpio_probe(struct platform_device *pdev) |
3c92db9a | 569 | { |
171b92c8 | 570 | const struct tegra_gpio_soc_config *config; |
b546be0d | 571 | struct tegra_gpio_info *tgi; |
88d8951e | 572 | struct resource *res; |
3c92db9a | 573 | struct tegra_gpio_bank *bank; |
f57f98a6 | 574 | int ret; |
47008001 | 575 | int gpio; |
3c92db9a EG |
576 | int i; |
577 | int j; | |
578 | ||
171b92c8 LD |
579 | config = of_device_get_match_data(&pdev->dev); |
580 | if (!config) { | |
165b6c2f SW |
581 | dev_err(&pdev->dev, "Error: No device match found\n"); |
582 | return -ENODEV; | |
583 | } | |
5c1e2c9d | 584 | |
b546be0d LD |
585 | tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL); |
586 | if (!tgi) | |
587 | return -ENODEV; | |
588 | ||
589 | tgi->soc = config; | |
590 | tgi->dev = &pdev->dev; | |
5c1e2c9d | 591 | |
3391811c | 592 | for (;;) { |
b546be0d LD |
593 | res = platform_get_resource(pdev, IORESOURCE_IRQ, |
594 | tgi->bank_count); | |
3391811c SW |
595 | if (!res) |
596 | break; | |
b546be0d | 597 | tgi->bank_count++; |
3391811c | 598 | } |
b546be0d | 599 | if (!tgi->bank_count) { |
3391811c SW |
600 | dev_err(&pdev->dev, "Missing IRQ resource\n"); |
601 | return -ENODEV; | |
602 | } | |
603 | ||
b546be0d LD |
604 | tgi->gc.label = "tegra-gpio"; |
605 | tgi->gc.request = tegra_gpio_request; | |
606 | tgi->gc.free = tegra_gpio_free; | |
607 | tgi->gc.direction_input = tegra_gpio_direction_input; | |
608 | tgi->gc.get = tegra_gpio_get; | |
609 | tgi->gc.direction_output = tegra_gpio_direction_output; | |
610 | tgi->gc.set = tegra_gpio_set; | |
f002d07c | 611 | tgi->gc.get_direction = tegra_gpio_get_direction; |
b546be0d LD |
612 | tgi->gc.to_irq = tegra_gpio_to_irq; |
613 | tgi->gc.base = 0; | |
614 | tgi->gc.ngpio = tgi->bank_count * 32; | |
615 | tgi->gc.parent = &pdev->dev; | |
616 | tgi->gc.of_node = pdev->dev.of_node; | |
617 | ||
618 | tgi->ic.name = "GPIO"; | |
619 | tgi->ic.irq_ack = tegra_gpio_irq_ack; | |
620 | tgi->ic.irq_mask = tegra_gpio_irq_mask; | |
621 | tgi->ic.irq_unmask = tegra_gpio_irq_unmask; | |
622 | tgi->ic.irq_set_type = tegra_gpio_irq_set_type; | |
623 | tgi->ic.irq_shutdown = tegra_gpio_irq_shutdown; | |
624 | #ifdef CONFIG_PM_SLEEP | |
625 | tgi->ic.irq_set_wake = tegra_gpio_irq_set_wake; | |
626 | #endif | |
627 | ||
628 | platform_set_drvdata(pdev, tgi); | |
3391811c | 629 | |
3737de42 | 630 | if (config->debounce_supported) |
2956b5d9 | 631 | tgi->gc.set_config = tegra_gpio_set_config; |
3737de42 | 632 | |
b546be0d LD |
633 | tgi->bank_info = devm_kzalloc(&pdev->dev, tgi->bank_count * |
634 | sizeof(*tgi->bank_info), GFP_KERNEL); | |
635 | if (!tgi->bank_info) | |
3391811c | 636 | return -ENODEV; |
3391811c | 637 | |
b546be0d LD |
638 | tgi->irq_domain = irq_domain_add_linear(pdev->dev.of_node, |
639 | tgi->gc.ngpio, | |
640 | &irq_domain_simple_ops, NULL); | |
641 | if (!tgi->irq_domain) | |
d0235677 | 642 | return -ENODEV; |
6f74dc9b | 643 | |
b546be0d | 644 | for (i = 0; i < tgi->bank_count; i++) { |
88d8951e SW |
645 | res = platform_get_resource(pdev, IORESOURCE_IRQ, i); |
646 | if (!res) { | |
647 | dev_err(&pdev->dev, "Missing IRQ resource\n"); | |
648 | return -ENODEV; | |
649 | } | |
650 | ||
b546be0d | 651 | bank = &tgi->bank_info[i]; |
88d8951e SW |
652 | bank->bank = i; |
653 | bank->irq = res->start; | |
b546be0d | 654 | bank->tgi = tgi; |
88d8951e SW |
655 | } |
656 | ||
657 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
b546be0d LD |
658 | tgi->regs = devm_ioremap_resource(&pdev->dev, res); |
659 | if (IS_ERR(tgi->regs)) | |
660 | return PTR_ERR(tgi->regs); | |
88d8951e | 661 | |
b546be0d | 662 | for (i = 0; i < tgi->bank_count; i++) { |
3c92db9a EG |
663 | for (j = 0; j < 4; j++) { |
664 | int gpio = tegra_gpio_compose(i, j, 0); | |
b546be0d | 665 | tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio)); |
3c92db9a EG |
666 | } |
667 | } | |
668 | ||
b546be0d | 669 | ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi); |
f57f98a6 | 670 | if (ret < 0) { |
b546be0d | 671 | irq_domain_remove(tgi->irq_domain); |
f57f98a6 SW |
672 | return ret; |
673 | } | |
3c92db9a | 674 | |
b546be0d LD |
675 | for (gpio = 0; gpio < tgi->gc.ngpio; gpio++) { |
676 | int irq = irq_create_mapping(tgi->irq_domain, gpio); | |
47008001 | 677 | /* No validity check; all Tegra GPIOs are valid IRQs */ |
3c92db9a | 678 | |
b546be0d | 679 | bank = &tgi->bank_info[GPIO_BANK(gpio)]; |
3c92db9a | 680 | |
9ee8ff48 | 681 | irq_set_lockdep_class(irq, &gpio_lock_class); |
47008001 | 682 | irq_set_chip_data(irq, bank); |
b546be0d | 683 | irq_set_chip_and_handler(irq, &tgi->ic, handle_simple_irq); |
3c92db9a EG |
684 | } |
685 | ||
b546be0d LD |
686 | for (i = 0; i < tgi->bank_count; i++) { |
687 | bank = &tgi->bank_info[i]; | |
3c92db9a | 688 | |
e88d251d RK |
689 | irq_set_chained_handler_and_data(bank->irq, |
690 | tegra_gpio_irq_handler, bank); | |
3c92db9a | 691 | |
3737de42 | 692 | for (j = 0; j < 4; j++) { |
3c92db9a | 693 | spin_lock_init(&bank->lvl_lock[j]); |
3737de42 LD |
694 | spin_lock_init(&bank->dbc_lock[j]); |
695 | } | |
3c92db9a EG |
696 | } |
697 | ||
b546be0d | 698 | tegra_gpio_debuginit(tgi); |
b59d5fb7 | 699 | |
3c92db9a EG |
700 | return 0; |
701 | } | |
702 | ||
804f5680 | 703 | static const struct tegra_gpio_soc_config tegra20_gpio_config = { |
171b92c8 LD |
704 | .bank_stride = 0x80, |
705 | .upper_offset = 0x800, | |
706 | }; | |
707 | ||
804f5680 | 708 | static const struct tegra_gpio_soc_config tegra30_gpio_config = { |
171b92c8 LD |
709 | .bank_stride = 0x100, |
710 | .upper_offset = 0x80, | |
711 | }; | |
712 | ||
3737de42 LD |
713 | static const struct tegra_gpio_soc_config tegra210_gpio_config = { |
714 | .debounce_supported = true, | |
715 | .bank_stride = 0x100, | |
716 | .upper_offset = 0x80, | |
717 | }; | |
718 | ||
171b92c8 | 719 | static const struct of_device_id tegra_gpio_of_match[] = { |
3737de42 | 720 | { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config }, |
171b92c8 LD |
721 | { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config }, |
722 | { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config }, | |
723 | { }, | |
724 | }; | |
725 | ||
88d8951e SW |
726 | static struct platform_driver tegra_gpio_driver = { |
727 | .driver = { | |
728 | .name = "tegra-gpio", | |
8939ddc7 | 729 | .pm = &tegra_gpio_pm_ops, |
88d8951e SW |
730 | .of_match_table = tegra_gpio_of_match, |
731 | }, | |
732 | .probe = tegra_gpio_probe, | |
733 | }; | |
734 | ||
735 | static int __init tegra_gpio_init(void) | |
736 | { | |
737 | return platform_driver_register(&tegra_gpio_driver); | |
738 | } | |
3c92db9a | 739 | postcore_initcall(tegra_gpio_init); |