Commit | Line | Data |
---|---|---|
bd41b99d | 1 | /* |
c103de24 | 2 | * U300 GPIO module. |
bd41b99d | 3 | * |
04b13de6 | 4 | * Copyright (C) 2007-2012 ST-Ericsson AB |
bd41b99d | 5 | * License terms: GNU General Public License (GPL) version 2 |
bd41b99d | 6 | * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0) |
cc890cd7 | 7 | * Author: Linus Walleij <linus.walleij@linaro.org> |
bd41b99d | 8 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> |
bd41b99d LW |
9 | */ |
10 | #include <linux/module.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/gpio.h> | |
cc890cd7 | 19 | #include <linux/slab.h> |
28a8d14c | 20 | #include <linux/pinctrl/consumer.h> |
dc0b1aa3 | 21 | #include <linux/pinctrl/pinconf-generic.h> |
dc0b1aa3 | 22 | #include "pinctrl-coh901.h" |
bd41b99d | 23 | |
04b13de6 | 24 | #define U300_GPIO_PORT_STRIDE (0x30) |
cc890cd7 | 25 | /* |
04b13de6 LW |
26 | * Control Register 32bit (R/W) |
27 | * bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores | |
28 | * gives the number of GPIO pins. | |
29 | * bit 8-2 (mask 0x000001FC) contains the core version ID. | |
cc890cd7 | 30 | */ |
04b13de6 LW |
31 | #define U300_GPIO_CR (0x00) |
32 | #define U300_GPIO_CR_SYNC_SEL_ENABLE (0x00000002UL) | |
33 | #define U300_GPIO_CR_BLOCK_CLKRQ_ENABLE (0x00000001UL) | |
34 | #define U300_GPIO_PXPDIR (0x04) | |
35 | #define U300_GPIO_PXPDOR (0x08) | |
36 | #define U300_GPIO_PXPCR (0x0C) | |
cc890cd7 LW |
37 | #define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK (0x0000FFFFUL) |
38 | #define U300_GPIO_PXPCR_PIN_MODE_MASK (0x00000003UL) | |
39 | #define U300_GPIO_PXPCR_PIN_MODE_SHIFT (0x00000002UL) | |
40 | #define U300_GPIO_PXPCR_PIN_MODE_INPUT (0x00000000UL) | |
41 | #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL (0x00000001UL) | |
42 | #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN (0x00000002UL) | |
43 | #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE (0x00000003UL) | |
04b13de6 LW |
44 | #define U300_GPIO_PXPER (0x10) |
45 | #define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK (0x000000FFUL) | |
46 | #define U300_GPIO_PXPER_PULL_UP_DISABLE (0x00000001UL) | |
47 | #define U300_GPIO_PXIEV (0x14) | |
48 | #define U300_GPIO_PXIEN (0x18) | |
49 | #define U300_GPIO_PXIFR (0x1C) | |
50 | #define U300_GPIO_PXICR (0x20) | |
cc890cd7 LW |
51 | #define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK (0x000000FFUL) |
52 | #define U300_GPIO_PXICR_IRQ_CONFIG_MASK (0x00000001UL) | |
53 | #define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE (0x00000000UL) | |
54 | #define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE (0x00000001UL) | |
cc890cd7 LW |
55 | |
56 | /* 8 bits per port, no version has more than 7 ports */ | |
b263e9b8 | 57 | #define U300_GPIO_NUM_PORTS 7 |
cc890cd7 | 58 | #define U300_GPIO_PINS_PER_PORT 8 |
b263e9b8 | 59 | #define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS) |
cc890cd7 | 60 | |
523dcce7 LW |
61 | struct u300_gpio_port { |
62 | struct u300_gpio *gpio; | |
63 | char name[8]; | |
64 | int irq; | |
65 | int number; | |
66 | u8 toggle_edge_mode; | |
67 | }; | |
68 | ||
cc890cd7 LW |
69 | struct u300_gpio { |
70 | struct gpio_chip chip; | |
523dcce7 | 71 | struct u300_gpio_port ports[U300_GPIO_NUM_PORTS]; |
cc890cd7 | 72 | struct clk *clk; |
cc890cd7 LW |
73 | void __iomem *base; |
74 | struct device *dev; | |
cc890cd7 LW |
75 | u32 stride; |
76 | /* Register offsets */ | |
77 | u32 pcr; | |
78 | u32 dor; | |
79 | u32 dir; | |
80 | u32 per; | |
81 | u32 icr; | |
82 | u32 ien; | |
83 | u32 iev; | |
84 | }; | |
bd41b99d | 85 | |
cc890cd7 LW |
86 | /* |
87 | * Macro to expand to read a specific register found in the "gpio" | |
88 | * struct. It requires the struct u300_gpio *gpio variable to exist in | |
89 | * its context. It calculates the port offset from the given pin | |
90 | * offset, muliplies by the port stride and adds the register offset | |
91 | * so it provides a pointer to the desired register. | |
92 | */ | |
93 | #define U300_PIN_REG(pin, reg) \ | |
94 | (gpio->base + (pin >> 3) * gpio->stride + gpio->reg) | |
bd41b99d | 95 | |
cc890cd7 LW |
96 | /* |
97 | * Provides a bitmask for a specific gpio pin inside an 8-bit GPIO | |
98 | * register. | |
99 | */ | |
100 | #define U300_PIN_BIT(pin) \ | |
101 | (1 << (pin & 0x07)) | |
bd41b99d | 102 | |
cc890cd7 LW |
103 | struct u300_gpio_confdata { |
104 | u16 bias_mode; | |
105 | bool output; | |
106 | int outval; | |
bd41b99d LW |
107 | }; |
108 | ||
cc890cd7 | 109 | #define U300_FLOATING_INPUT { \ |
a050b3ee | 110 | .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \ |
cc890cd7 LW |
111 | .output = false, \ |
112 | } | |
bd41b99d | 113 | |
cc890cd7 | 114 | #define U300_PULL_UP_INPUT { \ |
a050b3ee | 115 | .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \ |
cc890cd7 LW |
116 | .output = false, \ |
117 | } | |
bd41b99d | 118 | |
cc890cd7 LW |
119 | #define U300_OUTPUT_LOW { \ |
120 | .output = true, \ | |
121 | .outval = 0, \ | |
122 | } | |
bd41b99d | 123 | |
cc890cd7 LW |
124 | #define U300_OUTPUT_HIGH { \ |
125 | .output = true, \ | |
126 | .outval = 1, \ | |
127 | } | |
bd41b99d | 128 | |
bd41b99d | 129 | /* Initial configuration */ |
88aa9f74 | 130 | static const struct u300_gpio_confdata __initconst |
b263e9b8 | 131 | bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = { |
bd41b99d LW |
132 | /* Port 0, pins 0-7 */ |
133 | { | |
cc890cd7 LW |
134 | U300_FLOATING_INPUT, |
135 | U300_OUTPUT_HIGH, | |
136 | U300_FLOATING_INPUT, | |
137 | U300_OUTPUT_LOW, | |
138 | U300_OUTPUT_LOW, | |
139 | U300_OUTPUT_LOW, | |
140 | U300_OUTPUT_LOW, | |
141 | U300_OUTPUT_LOW, | |
bd41b99d LW |
142 | }, |
143 | /* Port 1, pins 0-7 */ | |
144 | { | |
cc890cd7 LW |
145 | U300_OUTPUT_LOW, |
146 | U300_OUTPUT_LOW, | |
147 | U300_OUTPUT_LOW, | |
148 | U300_PULL_UP_INPUT, | |
149 | U300_FLOATING_INPUT, | |
150 | U300_OUTPUT_HIGH, | |
151 | U300_OUTPUT_LOW, | |
152 | U300_OUTPUT_LOW, | |
bd41b99d LW |
153 | }, |
154 | /* Port 2, pins 0-7 */ | |
155 | { | |
cc890cd7 LW |
156 | U300_FLOATING_INPUT, |
157 | U300_FLOATING_INPUT, | |
158 | U300_FLOATING_INPUT, | |
159 | U300_FLOATING_INPUT, | |
160 | U300_OUTPUT_LOW, | |
161 | U300_PULL_UP_INPUT, | |
162 | U300_OUTPUT_LOW, | |
163 | U300_PULL_UP_INPUT, | |
bd41b99d LW |
164 | }, |
165 | /* Port 3, pins 0-7 */ | |
166 | { | |
cc890cd7 LW |
167 | U300_PULL_UP_INPUT, |
168 | U300_OUTPUT_LOW, | |
169 | U300_FLOATING_INPUT, | |
170 | U300_FLOATING_INPUT, | |
171 | U300_FLOATING_INPUT, | |
172 | U300_FLOATING_INPUT, | |
173 | U300_FLOATING_INPUT, | |
174 | U300_FLOATING_INPUT, | |
bd41b99d LW |
175 | }, |
176 | /* Port 4, pins 0-7 */ | |
177 | { | |
cc890cd7 LW |
178 | U300_FLOATING_INPUT, |
179 | U300_FLOATING_INPUT, | |
180 | U300_FLOATING_INPUT, | |
181 | U300_FLOATING_INPUT, | |
182 | U300_FLOATING_INPUT, | |
183 | U300_FLOATING_INPUT, | |
184 | U300_FLOATING_INPUT, | |
185 | U300_FLOATING_INPUT, | |
bd41b99d LW |
186 | }, |
187 | /* Port 5, pins 0-7 */ | |
188 | { | |
cc890cd7 LW |
189 | U300_FLOATING_INPUT, |
190 | U300_FLOATING_INPUT, | |
191 | U300_FLOATING_INPUT, | |
192 | U300_FLOATING_INPUT, | |
193 | U300_FLOATING_INPUT, | |
194 | U300_FLOATING_INPUT, | |
195 | U300_FLOATING_INPUT, | |
196 | U300_FLOATING_INPUT, | |
bd41b99d LW |
197 | }, |
198 | /* Port 6, pind 0-7 */ | |
199 | { | |
cc890cd7 LW |
200 | U300_FLOATING_INPUT, |
201 | U300_FLOATING_INPUT, | |
202 | U300_FLOATING_INPUT, | |
203 | U300_FLOATING_INPUT, | |
204 | U300_FLOATING_INPUT, | |
205 | U300_FLOATING_INPUT, | |
206 | U300_FLOATING_INPUT, | |
207 | U300_FLOATING_INPUT, | |
bd41b99d | 208 | } |
cc890cd7 | 209 | }; |
bd41b99d | 210 | |
cc890cd7 | 211 | static int u300_gpio_get(struct gpio_chip *chip, unsigned offset) |
bd41b99d | 212 | { |
014c1b3d | 213 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
bd41b99d | 214 | |
01a62834 | 215 | return !!(readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset)); |
bd41b99d | 216 | } |
bd41b99d | 217 | |
cc890cd7 | 218 | static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
ee17962e | 219 | { |
014c1b3d | 220 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
cc890cd7 LW |
221 | unsigned long flags; |
222 | u32 val; | |
ee17962e | 223 | |
cc890cd7 | 224 | local_irq_save(flags); |
bd41b99d | 225 | |
cc890cd7 LW |
226 | val = readl(U300_PIN_REG(offset, dor)); |
227 | if (value) | |
228 | writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor)); | |
229 | else | |
230 | writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor)); | |
bd41b99d | 231 | |
cc890cd7 | 232 | local_irq_restore(flags); |
bd41b99d | 233 | } |
bd41b99d | 234 | |
cc890cd7 | 235 | static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
bd41b99d | 236 | { |
014c1b3d | 237 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
cc890cd7 LW |
238 | unsigned long flags; |
239 | u32 val; | |
bd41b99d | 240 | |
cc890cd7 LW |
241 | local_irq_save(flags); |
242 | val = readl(U300_PIN_REG(offset, pcr)); | |
243 | /* Mask out this pin, note 2 bits per setting */ | |
244 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); | |
245 | writel(val, U300_PIN_REG(offset, pcr)); | |
246 | local_irq_restore(flags); | |
247 | return 0; | |
bd41b99d | 248 | } |
bd41b99d | 249 | |
cc890cd7 LW |
250 | static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
251 | int value) | |
bd41b99d | 252 | { |
014c1b3d | 253 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
bd41b99d | 254 | unsigned long flags; |
cc890cd7 LW |
255 | u32 oldmode; |
256 | u32 val; | |
bd41b99d LW |
257 | |
258 | local_irq_save(flags); | |
cc890cd7 LW |
259 | val = readl(U300_PIN_REG(offset, pcr)); |
260 | /* | |
261 | * Drive mode must be set by the special mode set function, set | |
262 | * push/pull mode by default if no mode has been selected. | |
263 | */ | |
264 | oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK << | |
265 | ((offset & 0x07) << 1)); | |
266 | /* mode = 0 means input, else some mode is already set */ | |
267 | if (oldmode == 0) { | |
268 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << | |
269 | ((offset & 0x07) << 1)); | |
270 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL | |
271 | << ((offset & 0x07) << 1)); | |
272 | writel(val, U300_PIN_REG(offset, pcr)); | |
bd41b99d | 273 | } |
cc890cd7 | 274 | u300_gpio_set(chip, offset, value); |
bd41b99d | 275 | local_irq_restore(flags); |
cc890cd7 | 276 | return 0; |
bd41b99d | 277 | } |
bd41b99d | 278 | |
dc0b1aa3 LW |
279 | /* Returning -EINVAL means "supported but not available" */ |
280 | int u300_gpio_config_get(struct gpio_chip *chip, | |
281 | unsigned offset, | |
282 | unsigned long *config) | |
283 | { | |
014c1b3d | 284 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
dc0b1aa3 LW |
285 | enum pin_config_param param = (enum pin_config_param) *config; |
286 | bool biasmode; | |
287 | u32 drmode; | |
288 | ||
289 | /* One bit per pin, clamp to bool range */ | |
290 | biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset)); | |
291 | ||
292 | /* Mask out the two bits for this pin and shift to bits 0,1 */ | |
293 | drmode = readl(U300_PIN_REG(offset, pcr)); | |
294 | drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); | |
295 | drmode >>= ((offset & 0x07) << 1); | |
296 | ||
8b0ef258 | 297 | switch (param) { |
dc0b1aa3 LW |
298 | case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: |
299 | *config = 0; | |
300 | if (biasmode) | |
301 | return 0; | |
302 | else | |
303 | return -EINVAL; | |
304 | break; | |
305 | case PIN_CONFIG_BIAS_PULL_UP: | |
306 | *config = 0; | |
307 | if (!biasmode) | |
308 | return 0; | |
309 | else | |
310 | return -EINVAL; | |
311 | break; | |
312 | case PIN_CONFIG_DRIVE_PUSH_PULL: | |
313 | *config = 0; | |
314 | if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL) | |
315 | return 0; | |
316 | else | |
317 | return -EINVAL; | |
318 | break; | |
319 | case PIN_CONFIG_DRIVE_OPEN_DRAIN: | |
320 | *config = 0; | |
321 | if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN) | |
322 | return 0; | |
323 | else | |
324 | return -EINVAL; | |
325 | break; | |
326 | case PIN_CONFIG_DRIVE_OPEN_SOURCE: | |
327 | *config = 0; | |
328 | if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE) | |
329 | return 0; | |
330 | else | |
331 | return -EINVAL; | |
332 | break; | |
333 | default: | |
334 | break; | |
335 | } | |
336 | return -ENOTSUPP; | |
337 | } | |
338 | ||
339 | int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset, | |
340 | enum pin_config_param param) | |
cc890cd7 | 341 | { |
014c1b3d | 342 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
bd41b99d LW |
343 | unsigned long flags; |
344 | u32 val; | |
345 | ||
bd41b99d | 346 | local_irq_save(flags); |
cc890cd7 | 347 | switch (param) { |
a050b3ee LW |
348 | case PIN_CONFIG_BIAS_DISABLE: |
349 | case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: | |
cc890cd7 LW |
350 | val = readl(U300_PIN_REG(offset, per)); |
351 | writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per)); | |
352 | break; | |
a050b3ee | 353 | case PIN_CONFIG_BIAS_PULL_UP: |
cc890cd7 LW |
354 | val = readl(U300_PIN_REG(offset, per)); |
355 | writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per)); | |
356 | break; | |
a050b3ee | 357 | case PIN_CONFIG_DRIVE_PUSH_PULL: |
cc890cd7 LW |
358 | val = readl(U300_PIN_REG(offset, pcr)); |
359 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK | |
360 | << ((offset & 0x07) << 1)); | |
361 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL | |
362 | << ((offset & 0x07) << 1)); | |
363 | writel(val, U300_PIN_REG(offset, pcr)); | |
364 | break; | |
a050b3ee | 365 | case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
cc890cd7 LW |
366 | val = readl(U300_PIN_REG(offset, pcr)); |
367 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK | |
368 | << ((offset & 0x07) << 1)); | |
369 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN | |
370 | << ((offset & 0x07) << 1)); | |
371 | writel(val, U300_PIN_REG(offset, pcr)); | |
372 | break; | |
a050b3ee | 373 | case PIN_CONFIG_DRIVE_OPEN_SOURCE: |
cc890cd7 LW |
374 | val = readl(U300_PIN_REG(offset, pcr)); |
375 | val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK | |
376 | << ((offset & 0x07) << 1)); | |
377 | val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE | |
378 | << ((offset & 0x07) << 1)); | |
379 | writel(val, U300_PIN_REG(offset, pcr)); | |
380 | break; | |
381 | default: | |
382 | local_irq_restore(flags); | |
383 | dev_err(gpio->dev, "illegal configuration requested\n"); | |
384 | return -EINVAL; | |
385 | } | |
bd41b99d LW |
386 | local_irq_restore(flags); |
387 | return 0; | |
388 | } | |
bd41b99d | 389 | |
cc890cd7 LW |
390 | static struct gpio_chip u300_gpio_chip = { |
391 | .label = "u300-gpio-chip", | |
392 | .owner = THIS_MODULE, | |
98c85d58 JG |
393 | .request = gpiochip_generic_request, |
394 | .free = gpiochip_generic_free, | |
cc890cd7 LW |
395 | .get = u300_gpio_get, |
396 | .set = u300_gpio_set, | |
397 | .direction_input = u300_gpio_direction_input, | |
398 | .direction_output = u300_gpio_direction_output, | |
cc890cd7 LW |
399 | }; |
400 | ||
401 | static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset) | |
bd41b99d | 402 | { |
bd41b99d LW |
403 | u32 val; |
404 | ||
cc890cd7 LW |
405 | val = readl(U300_PIN_REG(offset, icr)); |
406 | /* Set mode depending on state */ | |
407 | if (u300_gpio_get(&gpio->chip, offset)) { | |
408 | /* High now, let's trigger on falling edge next then */ | |
409 | writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); | |
410 | dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n", | |
411 | offset); | |
412 | } else { | |
413 | /* Low now, let's trigger on rising edge next then */ | |
414 | writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); | |
415 | dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n", | |
416 | offset); | |
417 | } | |
bd41b99d | 418 | } |
bd41b99d | 419 | |
cc890cd7 | 420 | static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger) |
bd41b99d | 421 | { |
523dcce7 | 422 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
014c1b3d | 423 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
523dcce7 LW |
424 | struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3]; |
425 | int offset = d->hwirq; | |
bd41b99d | 426 | u32 val; |
bd41b99d | 427 | |
cc890cd7 LW |
428 | if ((trigger & IRQF_TRIGGER_RISING) && |
429 | (trigger & IRQF_TRIGGER_FALLING)) { | |
430 | /* | |
431 | * The GPIO block can only trigger on falling OR rising edges, | |
432 | * not both. So we need to toggle the mode whenever the pin | |
433 | * goes from one state to the other with a special state flag | |
434 | */ | |
435 | dev_dbg(gpio->dev, | |
436 | "trigger on both rising and falling edge on pin %d\n", | |
437 | offset); | |
438 | port->toggle_edge_mode |= U300_PIN_BIT(offset); | |
439 | u300_toggle_trigger(gpio, offset); | |
440 | } else if (trigger & IRQF_TRIGGER_RISING) { | |
441 | dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n", | |
442 | offset); | |
443 | val = readl(U300_PIN_REG(offset, icr)); | |
444 | writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); | |
445 | port->toggle_edge_mode &= ~U300_PIN_BIT(offset); | |
446 | } else if (trigger & IRQF_TRIGGER_FALLING) { | |
447 | dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n", | |
448 | offset); | |
449 | val = readl(U300_PIN_REG(offset, icr)); | |
450 | writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); | |
451 | port->toggle_edge_mode &= ~U300_PIN_BIT(offset); | |
452 | } | |
453 | ||
454 | return 0; | |
bd41b99d | 455 | } |
bd41b99d | 456 | |
cc890cd7 | 457 | static void u300_gpio_irq_enable(struct irq_data *d) |
bd41b99d | 458 | { |
523dcce7 | 459 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
014c1b3d | 460 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
523dcce7 LW |
461 | struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3]; |
462 | int offset = d->hwirq; | |
bd41b99d LW |
463 | u32 val; |
464 | unsigned long flags; | |
465 | ||
a6c45b99 LW |
466 | dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n", |
467 | d->hwirq, port->name, offset); | |
bd41b99d | 468 | local_irq_save(flags); |
cc890cd7 LW |
469 | val = readl(U300_PIN_REG(offset, ien)); |
470 | writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien)); | |
bd41b99d LW |
471 | local_irq_restore(flags); |
472 | } | |
bd41b99d | 473 | |
cc890cd7 | 474 | static void u300_gpio_irq_disable(struct irq_data *d) |
bd41b99d | 475 | { |
523dcce7 | 476 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
014c1b3d | 477 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
523dcce7 | 478 | int offset = d->hwirq; |
bd41b99d LW |
479 | u32 val; |
480 | unsigned long flags; | |
481 | ||
482 | local_irq_save(flags); | |
cc890cd7 LW |
483 | val = readl(U300_PIN_REG(offset, ien)); |
484 | writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien)); | |
bd41b99d | 485 | local_irq_restore(flags); |
8c1d50a6 LW |
486 | } |
487 | ||
cc890cd7 LW |
488 | static struct irq_chip u300_gpio_irqchip = { |
489 | .name = "u300-gpio-irqchip", | |
490 | .irq_enable = u300_gpio_irq_enable, | |
491 | .irq_disable = u300_gpio_irq_disable, | |
492 | .irq_set_type = u300_gpio_irq_type, | |
cc890cd7 LW |
493 | }; |
494 | ||
bd0b9ac4 | 495 | static void u300_gpio_irq_handler(struct irq_desc *desc) |
bd41b99d | 496 | { |
fc02a469 | 497 | unsigned int irq = irq_desc_get_irq(desc); |
5663bb27 JL |
498 | struct irq_chip *parent_chip = irq_desc_get_chip(desc); |
499 | struct gpio_chip *chip = irq_desc_get_handler_data(desc); | |
014c1b3d | 500 | struct u300_gpio *gpio = gpiochip_get_data(chip); |
523dcce7 | 501 | struct u300_gpio_port *port = &gpio->ports[irq - chip->base]; |
cc890cd7 LW |
502 | int pinoffset = port->number << 3; /* get the right stride */ |
503 | unsigned long val; | |
bd41b99d | 504 | |
523dcce7 LW |
505 | chained_irq_enter(parent_chip, desc); |
506 | ||
bd41b99d | 507 | /* Read event register */ |
cc890cd7 | 508 | val = readl(U300_PIN_REG(pinoffset, iev)); |
bd41b99d | 509 | /* Mask relevant bits */ |
cc890cd7 | 510 | val &= 0xFFU; /* 8 bits per port */ |
bd41b99d | 511 | /* ACK IRQ (clear event) */ |
cc890cd7 LW |
512 | writel(val, U300_PIN_REG(pinoffset, iev)); |
513 | ||
514 | /* Call IRQ handler */ | |
515 | if (val != 0) { | |
516 | int irqoffset; | |
517 | ||
518 | for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) { | |
cc890cd7 | 519 | int offset = pinoffset + irqoffset; |
523dcce7 | 520 | int pin_irq = irq_find_mapping(chip->irqdomain, offset); |
cc890cd7 LW |
521 | |
522 | dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n", | |
523 | pin_irq, offset); | |
524 | generic_handle_irq(pin_irq); | |
525 | /* | |
526 | * Triggering IRQ on both rising and falling edge | |
527 | * needs mockery | |
528 | */ | |
529 | if (port->toggle_edge_mode & U300_PIN_BIT(offset)) | |
530 | u300_toggle_trigger(gpio, offset); | |
531 | } | |
bd41b99d | 532 | } |
cc890cd7 | 533 | |
523dcce7 | 534 | chained_irq_exit(parent_chip, desc); |
bd41b99d LW |
535 | } |
536 | ||
cc890cd7 LW |
537 | static void __init u300_gpio_init_pin(struct u300_gpio *gpio, |
538 | int offset, | |
539 | const struct u300_gpio_confdata *conf) | |
bd41b99d | 540 | { |
cc890cd7 LW |
541 | /* Set mode: input or output */ |
542 | if (conf->output) { | |
543 | u300_gpio_direction_output(&gpio->chip, offset, conf->outval); | |
bd41b99d | 544 | |
cc890cd7 | 545 | /* Deactivate bias mode for output */ |
dc0b1aa3 LW |
546 | u300_gpio_config_set(&gpio->chip, offset, |
547 | PIN_CONFIG_BIAS_HIGH_IMPEDANCE); | |
cc890cd7 LW |
548 | |
549 | /* Set drive mode for output */ | |
dc0b1aa3 LW |
550 | u300_gpio_config_set(&gpio->chip, offset, |
551 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
cc890cd7 LW |
552 | |
553 | dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n", | |
554 | offset, conf->outval); | |
555 | } else { | |
556 | u300_gpio_direction_input(&gpio->chip, offset); | |
557 | ||
558 | /* Always set output low on input pins */ | |
559 | u300_gpio_set(&gpio->chip, offset, 0); | |
560 | ||
561 | /* Set bias mode for input */ | |
dc0b1aa3 | 562 | u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode); |
cc890cd7 LW |
563 | |
564 | dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n", | |
565 | offset, conf->bias_mode); | |
bd41b99d | 566 | } |
cc890cd7 | 567 | } |
bd41b99d | 568 | |
b263e9b8 | 569 | static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio) |
cc890cd7 LW |
570 | { |
571 | int i, j; | |
572 | ||
573 | /* Write default config and values to all pins */ | |
b263e9b8 | 574 | for (i = 0; i < U300_GPIO_NUM_PORTS; i++) { |
cc890cd7 LW |
575 | for (j = 0; j < 8; j++) { |
576 | const struct u300_gpio_confdata *conf; | |
577 | int offset = (i*8) + j; | |
578 | ||
04b13de6 | 579 | conf = &bs335_gpio_config[i][j]; |
cc890cd7 | 580 | u300_gpio_init_pin(gpio, offset, conf); |
bd41b99d LW |
581 | } |
582 | } | |
cc890cd7 | 583 | } |
bd41b99d | 584 | |
387923c5 LW |
585 | /* |
586 | * Here we map a GPIO in the local gpio_chip pin space to a pin in | |
587 | * the local pinctrl pin space. The pin controller used is | |
588 | * pinctrl-u300. | |
589 | */ | |
590 | struct coh901_pinpair { | |
591 | unsigned int offset; | |
592 | unsigned int pin_base; | |
593 | }; | |
594 | ||
595 | #define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b } | |
596 | ||
597 | static struct coh901_pinpair coh901_pintable[] = { | |
598 | COH901_PINRANGE(10, 426), | |
599 | COH901_PINRANGE(11, 180), | |
600 | COH901_PINRANGE(12, 165), /* MS/MMC card insertion */ | |
601 | COH901_PINRANGE(13, 179), | |
602 | COH901_PINRANGE(14, 178), | |
603 | COH901_PINRANGE(16, 194), | |
604 | COH901_PINRANGE(17, 193), | |
605 | COH901_PINRANGE(18, 192), | |
606 | COH901_PINRANGE(19, 191), | |
607 | COH901_PINRANGE(20, 186), | |
608 | COH901_PINRANGE(21, 185), | |
609 | COH901_PINRANGE(22, 184), | |
610 | COH901_PINRANGE(23, 183), | |
611 | COH901_PINRANGE(24, 182), | |
612 | COH901_PINRANGE(25, 181), | |
613 | }; | |
614 | ||
cc890cd7 | 615 | static int __init u300_gpio_probe(struct platform_device *pdev) |
bd41b99d | 616 | { |
cc890cd7 | 617 | struct u300_gpio *gpio; |
585583f5 | 618 | struct resource *memres; |
bd41b99d | 619 | int err = 0; |
cc890cd7 LW |
620 | int portno; |
621 | u32 val; | |
622 | u32 ifr; | |
bd41b99d | 623 | int i; |
bd41b99d | 624 | |
585583f5 LW |
625 | gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL); |
626 | if (gpio == NULL) | |
cc890cd7 | 627 | return -ENOMEM; |
cc890cd7 LW |
628 | |
629 | gpio->chip = u300_gpio_chip; | |
b263e9b8 | 630 | gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT; |
58383c78 | 631 | gpio->chip.parent = &pdev->dev; |
b263e9b8 | 632 | gpio->chip.base = 0; |
cc890cd7 | 633 | gpio->dev = &pdev->dev; |
bd41b99d | 634 | |
585583f5 | 635 | memres = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
9e0c1fb2 TR |
636 | gpio->base = devm_ioremap_resource(&pdev->dev, memres); |
637 | if (IS_ERR(gpio->base)) | |
638 | return PTR_ERR(gpio->base); | |
585583f5 LW |
639 | |
640 | gpio->clk = devm_clk_get(gpio->dev, NULL); | |
cc890cd7 LW |
641 | if (IS_ERR(gpio->clk)) { |
642 | err = PTR_ERR(gpio->clk); | |
643 | dev_err(gpio->dev, "could not get GPIO clock\n"); | |
585583f5 | 644 | return err; |
bd41b99d | 645 | } |
585583f5 | 646 | |
27e8461c | 647 | err = clk_prepare_enable(gpio->clk); |
bd41b99d | 648 | if (err) { |
cc890cd7 | 649 | dev_err(gpio->dev, "could not enable GPIO clock\n"); |
585583f5 | 650 | return err; |
bd41b99d | 651 | } |
cc890cd7 | 652 | |
04b13de6 LW |
653 | dev_info(gpio->dev, |
654 | "initializing GPIO Controller COH 901 571/3\n"); | |
655 | gpio->stride = U300_GPIO_PORT_STRIDE; | |
656 | gpio->pcr = U300_GPIO_PXPCR; | |
657 | gpio->dor = U300_GPIO_PXPDOR; | |
658 | gpio->dir = U300_GPIO_PXPDIR; | |
659 | gpio->per = U300_GPIO_PXPER; | |
660 | gpio->icr = U300_GPIO_PXICR; | |
661 | gpio->ien = U300_GPIO_PXIEN; | |
662 | gpio->iev = U300_GPIO_PXIEV; | |
663 | ifr = U300_GPIO_PXIFR; | |
664 | ||
665 | val = readl(gpio->base + U300_GPIO_CR); | |
666 | dev_info(gpio->dev, "COH901571/3 block version: %d, " \ | |
667 | "number of cores: %d totalling %d pins\n", | |
668 | ((val & 0x000001FC) >> 2), | |
669 | ((val & 0x0000FE00) >> 9), | |
670 | ((val & 0x0000FE00) >> 9) * 8); | |
671 | writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, | |
672 | gpio->base + U300_GPIO_CR); | |
b263e9b8 | 673 | u300_gpio_init_coh901571(gpio); |
cc890cd7 | 674 | |
523dcce7 LW |
675 | #ifdef CONFIG_OF_GPIO |
676 | gpio->chip.of_node = pdev->dev.of_node; | |
677 | #endif | |
014c1b3d | 678 | err = gpiochip_add_data(&gpio->chip, gpio); |
523dcce7 LW |
679 | if (err) { |
680 | dev_err(gpio->dev, "unable to add gpiochip: %d\n", err); | |
681 | goto err_no_chip; | |
682 | } | |
683 | ||
684 | err = gpiochip_irqchip_add(&gpio->chip, | |
685 | &u300_gpio_irqchip, | |
686 | 0, | |
687 | handle_simple_irq, | |
688 | IRQ_TYPE_EDGE_FALLING); | |
689 | if (err) { | |
690 | dev_err(gpio->dev, "no GPIO irqchip\n"); | |
691 | goto err_no_irqchip; | |
692 | } | |
693 | ||
cc890cd7 | 694 | /* Add each port with its IRQ separately */ |
b263e9b8 | 695 | for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) { |
523dcce7 | 696 | struct u300_gpio_port *port = &gpio->ports[portno]; |
cc890cd7 LW |
697 | |
698 | snprintf(port->name, 8, "gpio%d", portno); | |
699 | port->number = portno; | |
700 | port->gpio = gpio; | |
701 | ||
351c2163 | 702 | port->irq = platform_get_irq(pdev, portno); |
cc890cd7 | 703 | |
523dcce7 LW |
704 | gpiochip_set_chained_irqchip(&gpio->chip, |
705 | &u300_gpio_irqchip, | |
706 | port->irq, | |
707 | u300_gpio_irq_handler); | |
cc890cd7 LW |
708 | |
709 | /* Turns off irq force (test register) for this port */ | |
710 | writel(0x0, gpio->base + portno * gpio->stride + ifr); | |
bd41b99d | 711 | } |
cc890cd7 LW |
712 | dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno); |
713 | ||
387923c5 LW |
714 | /* |
715 | * Add pinctrl pin ranges, the pin controller must be registered | |
716 | * at this point | |
717 | */ | |
718 | for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) { | |
719 | struct coh901_pinpair *p = &coh901_pintable[i]; | |
720 | ||
721 | err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300", | |
722 | p->offset, p->pin_base, 1); | |
723 | if (err) | |
724 | goto err_no_range; | |
725 | } | |
726 | ||
cc890cd7 | 727 | platform_set_drvdata(pdev, gpio); |
bd41b99d LW |
728 | |
729 | return 0; | |
730 | ||
387923c5 | 731 | err_no_range: |
523dcce7 | 732 | err_no_irqchip: |
b4e7c55d | 733 | gpiochip_remove(&gpio->chip); |
cc890cd7 | 734 | err_no_chip: |
27e8461c | 735 | clk_disable_unprepare(gpio->clk); |
80357203 | 736 | dev_err(&pdev->dev, "module ERROR:%d\n", err); |
bd41b99d LW |
737 | return err; |
738 | } | |
739 | ||
cc890cd7 | 740 | static int __exit u300_gpio_remove(struct platform_device *pdev) |
bd41b99d | 741 | { |
cc890cd7 | 742 | struct u300_gpio *gpio = platform_get_drvdata(pdev); |
bd41b99d LW |
743 | |
744 | /* Turn off the GPIO block */ | |
04b13de6 | 745 | writel(0x00000000U, gpio->base + U300_GPIO_CR); |
cc890cd7 | 746 | |
b4e7c55d | 747 | gpiochip_remove(&gpio->chip); |
27e8461c | 748 | clk_disable_unprepare(gpio->clk); |
bd41b99d LW |
749 | return 0; |
750 | } | |
751 | ||
351c2163 LW |
752 | static const struct of_device_id u300_gpio_match[] = { |
753 | { .compatible = "stericsson,gpio-coh901" }, | |
754 | {}, | |
755 | }; | |
756 | ||
cc890cd7 | 757 | static struct platform_driver u300_gpio_driver = { |
bd41b99d LW |
758 | .driver = { |
759 | .name = "u300-gpio", | |
351c2163 | 760 | .of_match_table = u300_gpio_match, |
bd41b99d | 761 | }, |
cc890cd7 | 762 | .remove = __exit_p(u300_gpio_remove), |
bd41b99d LW |
763 | }; |
764 | ||
bd41b99d LW |
765 | static int __init u300_gpio_init(void) |
766 | { | |
cc890cd7 | 767 | return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe); |
bd41b99d LW |
768 | } |
769 | ||
770 | static void __exit u300_gpio_exit(void) | |
771 | { | |
cc890cd7 | 772 | platform_driver_unregister(&u300_gpio_driver); |
bd41b99d LW |
773 | } |
774 | ||
775 | arch_initcall(u300_gpio_init); | |
776 | module_exit(u300_gpio_exit); | |
777 | ||
778 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
cc890cd7 | 779 | MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver"); |
bd41b99d | 780 | MODULE_LICENSE("GPL"); |