Commit | Line | Data |
---|---|---|
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 | 69 | struct tegra_gpio_bank { |
539b7a39 TR |
70 | unsigned int bank; |
71 | unsigned int irq; | |
3c92db9a | 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 | 114 | |
539b7a39 TR |
115 | static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port, |
116 | unsigned int bit) | |
3c92db9a EG |
117 | { |
118 | return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7); | |
119 | } | |
120 | ||
b546be0d | 121 | static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg, |
539b7a39 | 122 | unsigned int gpio, u32 value) |
3c92db9a EG |
123 | { |
124 | u32 val; | |
125 | ||
126 | val = 0x100 << GPIO_BIT(gpio); | |
127 | if (value) | |
128 | val |= 1 << GPIO_BIT(gpio); | |
b546be0d | 129 | tegra_gpio_writel(tgi, val, reg); |
3c92db9a EG |
130 | } |
131 | ||
539b7a39 | 132 | static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio) |
3c92db9a | 133 | { |
b546be0d | 134 | tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1); |
3c92db9a EG |
135 | } |
136 | ||
539b7a39 | 137 | static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio) |
3c92db9a | 138 | { |
b546be0d | 139 | tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0); |
3c92db9a EG |
140 | } |
141 | ||
4bc17860 | 142 | static int tegra_gpio_request(struct gpio_chip *chip, unsigned int offset) |
3e215d0a | 143 | { |
a9a1d2a7 | 144 | return pinctrl_gpio_request(offset); |
3e215d0a SW |
145 | } |
146 | ||
4bc17860 | 147 | static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset) |
3e215d0a | 148 | { |
b546be0d LD |
149 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
150 | ||
a9a1d2a7 | 151 | pinctrl_gpio_free(offset); |
b546be0d | 152 | tegra_gpio_disable(tgi, offset); |
3e215d0a SW |
153 | } |
154 | ||
4bc17860 TR |
155 | static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset, |
156 | int value) | |
3c92db9a | 157 | { |
b546be0d LD |
158 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
159 | ||
160 | tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value); | |
3c92db9a EG |
161 | } |
162 | ||
4bc17860 | 163 | static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset) |
3c92db9a | 164 | { |
b546be0d | 165 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
539b7a39 | 166 | unsigned int bval = BIT(GPIO_BIT(offset)); |
b546be0d | 167 | |
195812e4 | 168 | /* If gpio is in output mode then read from the out value */ |
b546be0d LD |
169 | if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval) |
170 | return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval); | |
195812e4 | 171 | |
b546be0d | 172 | return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval); |
3c92db9a EG |
173 | } |
174 | ||
4bc17860 TR |
175 | static int tegra_gpio_direction_input(struct gpio_chip *chip, |
176 | unsigned int offset) | |
3c92db9a | 177 | { |
b546be0d LD |
178 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
179 | ||
180 | tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0); | |
181 | tegra_gpio_enable(tgi, offset); | |
3c92db9a EG |
182 | return 0; |
183 | } | |
184 | ||
4bc17860 TR |
185 | static int tegra_gpio_direction_output(struct gpio_chip *chip, |
186 | unsigned int offset, | |
187 | int value) | |
3c92db9a | 188 | { |
b546be0d LD |
189 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
190 | ||
3c92db9a | 191 | tegra_gpio_set(chip, offset, value); |
b546be0d LD |
192 | tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1); |
193 | tegra_gpio_enable(tgi, offset); | |
3c92db9a EG |
194 | return 0; |
195 | } | |
196 | ||
4bc17860 TR |
197 | static int tegra_gpio_get_direction(struct gpio_chip *chip, |
198 | unsigned int offset) | |
f002d07c LD |
199 | { |
200 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); | |
201 | u32 pin_mask = BIT(GPIO_BIT(offset)); | |
202 | u32 cnf, oe; | |
203 | ||
204 | cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset)); | |
205 | if (!(cnf & pin_mask)) | |
206 | return -EINVAL; | |
207 | ||
208 | oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)); | |
209 | ||
210 | return (oe & pin_mask) ? GPIOF_DIR_OUT : GPIOF_DIR_IN; | |
211 | } | |
212 | ||
3737de42 LD |
213 | static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset, |
214 | unsigned int debounce) | |
215 | { | |
216 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); | |
217 | struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)]; | |
218 | unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000); | |
219 | unsigned long flags; | |
539b7a39 | 220 | unsigned int port; |
3737de42 LD |
221 | |
222 | if (!debounce_ms) { | |
223 | tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), | |
224 | offset, 0); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | debounce_ms = min(debounce_ms, 255U); | |
229 | port = GPIO_PORT(offset); | |
230 | ||
231 | /* There is only one debounce count register per port and hence | |
232 | * set the maximum of current and requested debounce time. | |
233 | */ | |
234 | spin_lock_irqsave(&bank->dbc_lock[port], flags); | |
235 | if (bank->dbc_cnt[port] < debounce_ms) { | |
236 | tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset)); | |
237 | bank->dbc_cnt[port] = debounce_ms; | |
238 | } | |
239 | spin_unlock_irqrestore(&bank->dbc_lock[port], flags); | |
240 | ||
241 | tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
2956b5d9 MW |
246 | static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
247 | unsigned long config) | |
248 | { | |
249 | u32 debounce; | |
250 | ||
251 | if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) | |
252 | return -ENOTSUPP; | |
253 | ||
254 | debounce = pinconf_to_config_argument(config); | |
255 | return tegra_gpio_set_debounce(chip, offset, debounce); | |
256 | } | |
257 | ||
4bc17860 | 258 | static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) |
438a99c0 | 259 | { |
b546be0d | 260 | struct tegra_gpio_info *tgi = gpiochip_get_data(chip); |
3c92db9a | 261 | |
b546be0d LD |
262 | return irq_find_mapping(tgi->irq_domain, offset); |
263 | } | |
3c92db9a | 264 | |
37337a8d | 265 | static void tegra_gpio_irq_ack(struct irq_data *d) |
3c92db9a | 266 | { |
b546be0d LD |
267 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
268 | struct tegra_gpio_info *tgi = bank->tgi; | |
539b7a39 | 269 | unsigned int gpio = d->hwirq; |
3c92db9a | 270 | |
b546be0d | 271 | tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio)); |
3c92db9a EG |
272 | } |
273 | ||
37337a8d | 274 | static void tegra_gpio_irq_mask(struct irq_data *d) |
3c92db9a | 275 | { |
b546be0d LD |
276 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
277 | struct tegra_gpio_info *tgi = bank->tgi; | |
539b7a39 | 278 | unsigned int gpio = d->hwirq; |
3c92db9a | 279 | |
b546be0d | 280 | tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0); |
3c92db9a EG |
281 | } |
282 | ||
37337a8d | 283 | static void tegra_gpio_irq_unmask(struct irq_data *d) |
3c92db9a | 284 | { |
b546be0d LD |
285 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
286 | struct tegra_gpio_info *tgi = bank->tgi; | |
539b7a39 | 287 | unsigned int gpio = d->hwirq; |
3c92db9a | 288 | |
b546be0d | 289 | tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1); |
3c92db9a EG |
290 | } |
291 | ||
37337a8d | 292 | static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
3c92db9a | 293 | { |
539b7a39 | 294 | unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type; |
37337a8d | 295 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
b546be0d | 296 | struct tegra_gpio_info *tgi = bank->tgi; |
3c92db9a | 297 | unsigned long flags; |
539b7a39 | 298 | u32 val; |
df231f28 | 299 | int ret; |
3c92db9a EG |
300 | |
301 | switch (type & IRQ_TYPE_SENSE_MASK) { | |
302 | case IRQ_TYPE_EDGE_RISING: | |
303 | lvl_type = GPIO_INT_LVL_EDGE_RISING; | |
304 | break; | |
305 | ||
306 | case IRQ_TYPE_EDGE_FALLING: | |
307 | lvl_type = GPIO_INT_LVL_EDGE_FALLING; | |
308 | break; | |
309 | ||
310 | case IRQ_TYPE_EDGE_BOTH: | |
311 | lvl_type = GPIO_INT_LVL_EDGE_BOTH; | |
312 | break; | |
313 | ||
314 | case IRQ_TYPE_LEVEL_HIGH: | |
315 | lvl_type = GPIO_INT_LVL_LEVEL_HIGH; | |
316 | break; | |
317 | ||
318 | case IRQ_TYPE_LEVEL_LOW: | |
319 | lvl_type = GPIO_INT_LVL_LEVEL_LOW; | |
320 | break; | |
321 | ||
322 | default: | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
b546be0d | 326 | ret = gpiochip_lock_as_irq(&tgi->gc, gpio); |
df231f28 | 327 | if (ret) { |
b546be0d | 328 | dev_err(tgi->dev, |
539b7a39 | 329 | "unable to lock Tegra GPIO %u as IRQ\n", gpio); |
df231f28 SW |
330 | return ret; |
331 | } | |
332 | ||
3c92db9a EG |
333 | spin_lock_irqsave(&bank->lvl_lock[port], flags); |
334 | ||
b546be0d | 335 | val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); |
3c92db9a EG |
336 | val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio)); |
337 | val |= lvl_type << GPIO_BIT(gpio); | |
b546be0d | 338 | tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio)); |
3c92db9a EG |
339 | |
340 | spin_unlock_irqrestore(&bank->lvl_lock[port], flags); | |
341 | ||
b546be0d LD |
342 | tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0); |
343 | tegra_gpio_enable(tgi, gpio); | |
d941136f | 344 | |
3c92db9a | 345 | if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) |
f170d71e | 346 | irq_set_handler_locked(d, handle_level_irq); |
3c92db9a | 347 | else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) |
f170d71e | 348 | irq_set_handler_locked(d, handle_edge_irq); |
3c92db9a EG |
349 | |
350 | return 0; | |
351 | } | |
352 | ||
df231f28 SW |
353 | static void tegra_gpio_irq_shutdown(struct irq_data *d) |
354 | { | |
b546be0d LD |
355 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
356 | struct tegra_gpio_info *tgi = bank->tgi; | |
539b7a39 | 357 | unsigned int gpio = d->hwirq; |
df231f28 | 358 | |
b546be0d | 359 | gpiochip_unlock_as_irq(&tgi->gc, gpio); |
df231f28 SW |
360 | } |
361 | ||
bd0b9ac4 | 362 | static void tegra_gpio_irq_handler(struct irq_desc *desc) |
3c92db9a | 363 | { |
539b7a39 | 364 | unsigned int port, pin, gpio; |
9e9509e3 | 365 | bool unmasked = false; |
b546be0d LD |
366 | u32 lvl; |
367 | unsigned long sta; | |
98022940 | 368 | struct irq_chip *chip = irq_desc_get_chip(desc); |
476f8b4c | 369 | struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc); |
b546be0d | 370 | struct tegra_gpio_info *tgi = bank->tgi; |
3c92db9a | 371 | |
98022940 | 372 | chained_irq_enter(chip, desc); |
3c92db9a | 373 | |
3c92db9a | 374 | for (port = 0; port < 4; port++) { |
b546be0d LD |
375 | gpio = tegra_gpio_compose(bank->bank, port, 0); |
376 | sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) & | |
377 | tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)); | |
378 | lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); | |
3c92db9a EG |
379 | |
380 | for_each_set_bit(pin, &sta, 8) { | |
b546be0d LD |
381 | tegra_gpio_writel(tgi, 1 << pin, |
382 | GPIO_INT_CLR(tgi, gpio)); | |
3c92db9a EG |
383 | |
384 | /* if gpio is edge triggered, clear condition | |
20a8a968 | 385 | * before executing the handler so that we don't |
3c92db9a EG |
386 | * miss edges |
387 | */ | |
9e9509e3 MM |
388 | if (!unmasked && lvl & (0x100 << pin)) { |
389 | unmasked = true; | |
98022940 | 390 | chained_irq_exit(chip, desc); |
3c92db9a EG |
391 | } |
392 | ||
c0debb3d GS |
393 | generic_handle_irq(irq_find_mapping(tgi->irq_domain, |
394 | gpio + pin)); | |
3c92db9a EG |
395 | } |
396 | } | |
397 | ||
398 | if (!unmasked) | |
98022940 | 399 | chained_irq_exit(chip, desc); |
3c92db9a EG |
400 | |
401 | } | |
402 | ||
8939ddc7 LD |
403 | #ifdef CONFIG_PM_SLEEP |
404 | static int tegra_gpio_resume(struct device *dev) | |
2e47b8b3 | 405 | { |
b546be0d LD |
406 | struct platform_device *pdev = to_platform_device(dev); |
407 | struct tegra_gpio_info *tgi = platform_get_drvdata(pdev); | |
2e47b8b3 | 408 | unsigned long flags; |
539b7a39 | 409 | unsigned int b, 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++) { | |
4bc17860 TR |
417 | unsigned int gpio = (b << 5) | (p << 3); |
418 | ||
b546be0d LD |
419 | tegra_gpio_writel(tgi, bank->cnf[p], |
420 | GPIO_CNF(tgi, gpio)); | |
3737de42 LD |
421 | |
422 | if (tgi->soc->debounce_supported) { | |
423 | tegra_gpio_writel(tgi, bank->dbc_cnt[p], | |
424 | GPIO_DBC_CNT(tgi, gpio)); | |
425 | tegra_gpio_writel(tgi, bank->dbc_enb[p], | |
426 | GPIO_MSK_DBC_EN(tgi, gpio)); | |
427 | } | |
428 | ||
b546be0d LD |
429 | tegra_gpio_writel(tgi, bank->out[p], |
430 | GPIO_OUT(tgi, gpio)); | |
431 | tegra_gpio_writel(tgi, bank->oe[p], | |
432 | GPIO_OE(tgi, gpio)); | |
433 | tegra_gpio_writel(tgi, bank->int_lvl[p], | |
434 | GPIO_INT_LVL(tgi, gpio)); | |
435 | tegra_gpio_writel(tgi, bank->int_enb[p], | |
436 | GPIO_INT_ENB(tgi, gpio)); | |
2e47b8b3 CC |
437 | } |
438 | } | |
439 | ||
440 | local_irq_restore(flags); | |
8939ddc7 | 441 | return 0; |
2e47b8b3 CC |
442 | } |
443 | ||
8939ddc7 | 444 | static int tegra_gpio_suspend(struct device *dev) |
2e47b8b3 | 445 | { |
b546be0d LD |
446 | struct platform_device *pdev = to_platform_device(dev); |
447 | struct tegra_gpio_info *tgi = platform_get_drvdata(pdev); | |
2e47b8b3 | 448 | unsigned long flags; |
539b7a39 | 449 | unsigned int b, 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++) { | |
4bc17860 TR |
456 | unsigned int gpio = (b << 5) | (p << 3); |
457 | ||
b546be0d LD |
458 | bank->cnf[p] = tegra_gpio_readl(tgi, |
459 | GPIO_CNF(tgi, gpio)); | |
460 | bank->out[p] = tegra_gpio_readl(tgi, | |
461 | GPIO_OUT(tgi, gpio)); | |
462 | bank->oe[p] = tegra_gpio_readl(tgi, | |
463 | GPIO_OE(tgi, gpio)); | |
3737de42 LD |
464 | if (tgi->soc->debounce_supported) { |
465 | bank->dbc_enb[p] = tegra_gpio_readl(tgi, | |
466 | GPIO_MSK_DBC_EN(tgi, gpio)); | |
467 | bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) | | |
468 | bank->dbc_enb[p]; | |
469 | } | |
470 | ||
b546be0d LD |
471 | bank->int_enb[p] = tegra_gpio_readl(tgi, |
472 | GPIO_INT_ENB(tgi, gpio)); | |
473 | bank->int_lvl[p] = tegra_gpio_readl(tgi, | |
474 | GPIO_INT_LVL(tgi, gpio)); | |
203f31cb JL |
475 | |
476 | /* Enable gpio irq for wake up source */ | |
b546be0d LD |
477 | tegra_gpio_writel(tgi, bank->wake_enb[p], |
478 | GPIO_INT_ENB(tgi, gpio)); | |
2e47b8b3 CC |
479 | } |
480 | } | |
481 | local_irq_restore(flags); | |
8939ddc7 | 482 | return 0; |
2e47b8b3 CC |
483 | } |
484 | ||
203f31cb | 485 | static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) |
2e47b8b3 | 486 | { |
37337a8d | 487 | struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); |
539b7a39 | 488 | unsigned int gpio = d->hwirq; |
203f31cb JL |
489 | u32 port, bit, mask; |
490 | ||
491 | port = GPIO_PORT(gpio); | |
492 | bit = GPIO_BIT(gpio); | |
493 | mask = BIT(bit); | |
494 | ||
495 | if (enable) | |
496 | bank->wake_enb[port] |= mask; | |
497 | else | |
498 | bank->wake_enb[port] &= ~mask; | |
499 | ||
6845664a | 500 | return irq_set_irq_wake(bank->irq, enable); |
2e47b8b3 CC |
501 | } |
502 | #endif | |
3c92db9a | 503 | |
b59d5fb7 SP |
504 | #ifdef CONFIG_DEBUG_FS |
505 | ||
506 | #include <linux/debugfs.h> | |
507 | #include <linux/seq_file.h> | |
508 | ||
2773eb2f | 509 | static int tegra_dbg_gpio_show(struct seq_file *s, void *unused) |
b59d5fb7 | 510 | { |
b546be0d | 511 | struct tegra_gpio_info *tgi = s->private; |
539b7a39 | 512 | unsigned int i, j; |
b59d5fb7 | 513 | |
b546be0d | 514 | for (i = 0; i < tgi->bank_count; i++) { |
b59d5fb7 | 515 | for (j = 0; j < 4; j++) { |
539b7a39 | 516 | unsigned int gpio = tegra_gpio_compose(i, j, 0); |
4bc17860 | 517 | |
b59d5fb7 | 518 | seq_printf(s, |
539b7a39 | 519 | "%u:%u %02x %02x %02x %02x %02x %02x %06x\n", |
b59d5fb7 | 520 | i, j, |
b546be0d LD |
521 | tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)), |
522 | tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)), | |
523 | tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)), | |
524 | tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)), | |
525 | tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)), | |
526 | tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)), | |
527 | tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio))); | |
b59d5fb7 SP |
528 | } |
529 | } | |
530 | return 0; | |
531 | } | |
532 | ||
2773eb2f | 533 | DEFINE_SHOW_ATTRIBUTE(tegra_dbg_gpio); |
b59d5fb7 | 534 | |
b546be0d | 535 | static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) |
b59d5fb7 | 536 | { |
4bc17860 | 537 | (void) debugfs_create_file("tegra_gpio", 0444, |
2773eb2f | 538 | NULL, tgi, &tegra_dbg_gpio_fops); |
b59d5fb7 SP |
539 | } |
540 | ||
541 | #else | |
542 | ||
b546be0d | 543 | static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) |
b59d5fb7 SP |
544 | { |
545 | } | |
546 | ||
547 | #endif | |
548 | ||
8939ddc7 LD |
549 | static const struct dev_pm_ops tegra_gpio_pm_ops = { |
550 | SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume) | |
551 | }; | |
552 | ||
9ee8ff48 TR |
553 | /* |
554 | * This lock class tells lockdep that GPIO irqs are in a different category | |
555 | * than their parents, so it won't report false recursion. | |
556 | */ | |
557 | static struct lock_class_key gpio_lock_class; | |
39c3fd58 | 558 | static struct lock_class_key gpio_request_class; |
9ee8ff48 | 559 | |
3836309d | 560 | static int tegra_gpio_probe(struct platform_device *pdev) |
3c92db9a | 561 | { |
b546be0d | 562 | struct tegra_gpio_info *tgi; |
88d8951e | 563 | struct resource *res; |
3c92db9a | 564 | struct tegra_gpio_bank *bank; |
539b7a39 | 565 | unsigned int gpio, i, j; |
f57f98a6 | 566 | int ret; |
3c92db9a | 567 | |
b546be0d LD |
568 | tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL); |
569 | if (!tgi) | |
570 | return -ENODEV; | |
571 | ||
20133bd5 | 572 | tgi->soc = of_device_get_match_data(&pdev->dev); |
b546be0d | 573 | tgi->dev = &pdev->dev; |
5c1e2c9d | 574 | |
56420903 TR |
575 | ret = platform_irq_count(pdev); |
576 | if (ret < 0) | |
577 | return ret; | |
578 | ||
579 | tgi->bank_count = ret; | |
580 | ||
b546be0d | 581 | if (!tgi->bank_count) { |
3391811c SW |
582 | dev_err(&pdev->dev, "Missing IRQ resource\n"); |
583 | return -ENODEV; | |
584 | } | |
585 | ||
b546be0d LD |
586 | tgi->gc.label = "tegra-gpio"; |
587 | tgi->gc.request = tegra_gpio_request; | |
588 | tgi->gc.free = tegra_gpio_free; | |
589 | tgi->gc.direction_input = tegra_gpio_direction_input; | |
590 | tgi->gc.get = tegra_gpio_get; | |
591 | tgi->gc.direction_output = tegra_gpio_direction_output; | |
592 | tgi->gc.set = tegra_gpio_set; | |
f002d07c | 593 | tgi->gc.get_direction = tegra_gpio_get_direction; |
b546be0d LD |
594 | tgi->gc.to_irq = tegra_gpio_to_irq; |
595 | tgi->gc.base = 0; | |
596 | tgi->gc.ngpio = tgi->bank_count * 32; | |
597 | tgi->gc.parent = &pdev->dev; | |
598 | tgi->gc.of_node = pdev->dev.of_node; | |
599 | ||
600 | tgi->ic.name = "GPIO"; | |
601 | tgi->ic.irq_ack = tegra_gpio_irq_ack; | |
602 | tgi->ic.irq_mask = tegra_gpio_irq_mask; | |
603 | tgi->ic.irq_unmask = tegra_gpio_irq_unmask; | |
604 | tgi->ic.irq_set_type = tegra_gpio_irq_set_type; | |
605 | tgi->ic.irq_shutdown = tegra_gpio_irq_shutdown; | |
606 | #ifdef CONFIG_PM_SLEEP | |
607 | tgi->ic.irq_set_wake = tegra_gpio_irq_set_wake; | |
608 | #endif | |
609 | ||
610 | platform_set_drvdata(pdev, tgi); | |
3391811c | 611 | |
20133bd5 | 612 | if (tgi->soc->debounce_supported) |
2956b5d9 | 613 | tgi->gc.set_config = tegra_gpio_set_config; |
3737de42 | 614 | |
9b882269 | 615 | tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count, |
b546be0d LD |
616 | sizeof(*tgi->bank_info), GFP_KERNEL); |
617 | if (!tgi->bank_info) | |
9b882269 | 618 | return -ENOMEM; |
3391811c | 619 | |
b546be0d LD |
620 | tgi->irq_domain = irq_domain_add_linear(pdev->dev.of_node, |
621 | tgi->gc.ngpio, | |
622 | &irq_domain_simple_ops, NULL); | |
623 | if (!tgi->irq_domain) | |
d0235677 | 624 | return -ENODEV; |
6f74dc9b | 625 | |
b546be0d | 626 | for (i = 0; i < tgi->bank_count; i++) { |
9c07409c TR |
627 | ret = platform_get_irq(pdev, i); |
628 | if (ret < 0) { | |
629 | dev_err(&pdev->dev, "Missing IRQ resource: %d\n", ret); | |
630 | return ret; | |
88d8951e SW |
631 | } |
632 | ||
b546be0d | 633 | bank = &tgi->bank_info[i]; |
88d8951e | 634 | bank->bank = i; |
9c07409c | 635 | bank->irq = ret; |
b546be0d | 636 | bank->tgi = tgi; |
88d8951e SW |
637 | } |
638 | ||
639 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
b546be0d LD |
640 | tgi->regs = devm_ioremap_resource(&pdev->dev, res); |
641 | if (IS_ERR(tgi->regs)) | |
642 | return PTR_ERR(tgi->regs); | |
88d8951e | 643 | |
b546be0d | 644 | for (i = 0; i < tgi->bank_count; i++) { |
3c92db9a EG |
645 | for (j = 0; j < 4; j++) { |
646 | int gpio = tegra_gpio_compose(i, j, 0); | |
4bc17860 | 647 | |
b546be0d | 648 | tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio)); |
3c92db9a EG |
649 | } |
650 | } | |
651 | ||
b546be0d | 652 | ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi); |
f57f98a6 | 653 | if (ret < 0) { |
b546be0d | 654 | irq_domain_remove(tgi->irq_domain); |
f57f98a6 SW |
655 | return ret; |
656 | } | |
3c92db9a | 657 | |
b546be0d LD |
658 | for (gpio = 0; gpio < tgi->gc.ngpio; gpio++) { |
659 | int irq = irq_create_mapping(tgi->irq_domain, gpio); | |
47008001 | 660 | /* No validity check; all Tegra GPIOs are valid IRQs */ |
3c92db9a | 661 | |
b546be0d | 662 | bank = &tgi->bank_info[GPIO_BANK(gpio)]; |
3c92db9a | 663 | |
39c3fd58 AL |
664 | irq_set_lockdep_class(irq, &gpio_lock_class, |
665 | &gpio_request_class); | |
47008001 | 666 | irq_set_chip_data(irq, bank); |
b546be0d | 667 | irq_set_chip_and_handler(irq, &tgi->ic, handle_simple_irq); |
3c92db9a EG |
668 | } |
669 | ||
b546be0d LD |
670 | for (i = 0; i < tgi->bank_count; i++) { |
671 | bank = &tgi->bank_info[i]; | |
3c92db9a | 672 | |
e88d251d RK |
673 | irq_set_chained_handler_and_data(bank->irq, |
674 | tegra_gpio_irq_handler, bank); | |
3c92db9a | 675 | |
3737de42 | 676 | for (j = 0; j < 4; j++) { |
3c92db9a | 677 | spin_lock_init(&bank->lvl_lock[j]); |
3737de42 LD |
678 | spin_lock_init(&bank->dbc_lock[j]); |
679 | } | |
3c92db9a EG |
680 | } |
681 | ||
b546be0d | 682 | tegra_gpio_debuginit(tgi); |
b59d5fb7 | 683 | |
3c92db9a EG |
684 | return 0; |
685 | } | |
686 | ||
804f5680 | 687 | static const struct tegra_gpio_soc_config tegra20_gpio_config = { |
171b92c8 LD |
688 | .bank_stride = 0x80, |
689 | .upper_offset = 0x800, | |
690 | }; | |
691 | ||
804f5680 | 692 | static const struct tegra_gpio_soc_config tegra30_gpio_config = { |
171b92c8 LD |
693 | .bank_stride = 0x100, |
694 | .upper_offset = 0x80, | |
695 | }; | |
696 | ||
3737de42 LD |
697 | static const struct tegra_gpio_soc_config tegra210_gpio_config = { |
698 | .debounce_supported = true, | |
699 | .bank_stride = 0x100, | |
700 | .upper_offset = 0x80, | |
701 | }; | |
702 | ||
171b92c8 | 703 | static const struct of_device_id tegra_gpio_of_match[] = { |
3737de42 | 704 | { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config }, |
171b92c8 LD |
705 | { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config }, |
706 | { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config }, | |
707 | { }, | |
708 | }; | |
709 | ||
88d8951e SW |
710 | static struct platform_driver tegra_gpio_driver = { |
711 | .driver = { | |
712 | .name = "tegra-gpio", | |
8939ddc7 | 713 | .pm = &tegra_gpio_pm_ops, |
88d8951e SW |
714 | .of_match_table = tegra_gpio_of_match, |
715 | }, | |
716 | .probe = tegra_gpio_probe, | |
717 | }; | |
718 | ||
719 | static int __init tegra_gpio_init(void) | |
720 | { | |
721 | return platform_driver_register(&tegra_gpio_driver); | |
722 | } | |
3c92db9a | 723 | postcore_initcall(tegra_gpio_init); |