1 /*
2 * U300 GPIO module.
3 *
4 * Copyright (C) 2007-2012 ST-Ericsson AB
5 * License terms: GNU General Public License (GPL) version 2
6 * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
7 * Author: Linus Walleij <linus.walleij@linaro.org>
8 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
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>
19 #include <linux/slab.h>
20 #include <linux/pinctrl/consumer.h>
21 #include <linux/pinctrl/pinconf-generic.h>
22 #include "pinctrl-coh901.h"
23
24 #define U300_GPIO_PORT_STRIDE (0x30)
25 /*
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.
30 */
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)
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)
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)
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)
55
56 /* 8 bits per port, no version has more than 7 ports */
57 #define U300_GPIO_NUM_PORTS 7
58 #define U300_GPIO_PINS_PER_PORT 8
59 #define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS)
60
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
69 struct u300_gpio {
70 struct gpio_chip chip;
71 struct u300_gpio_port ports[U300_GPIO_NUM_PORTS];
72 struct clk *clk;
73 void __iomem *base;
74 struct device *dev;
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 };
85
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)
95
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))
102
103 struct u300_gpio_confdata {
104 u16 bias_mode;
105 bool output;
106 int outval;
107 };
108
109 #define U300_FLOATING_INPUT { \
110 .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \
111 .output = false, \
112 }
113
114 #define U300_PULL_UP_INPUT { \
115 .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \
116 .output = false, \
117 }
118
119 #define U300_OUTPUT_LOW { \
120 .output = true, \
121 .outval = 0, \
122 }
123
124 #define U300_OUTPUT_HIGH { \
125 .output = true, \
126 .outval = 1, \
127 }
128
129 /* Initial configuration */
130 static const struct __initconst u300_gpio_confdata
131 bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
132 /* Port 0, pins 0-7 */
133 {
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,
142 },
143 /* Port 1, pins 0-7 */
144 {
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,
153 },
154 /* Port 2, pins 0-7 */
155 {
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,
164 },
165 /* Port 3, pins 0-7 */
166 {
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,
175 },
176 /* Port 4, pins 0-7 */
177 {
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,
186 },
187 /* Port 5, pins 0-7 */
188 {
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,
197 },
198 /* Port 6, pind 0-7 */
199 {
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,
208 }
209 };
210
211 /**
212 * to_u300_gpio() - get the pointer to u300_gpio
213 * @chip: the gpio chip member of the structure u300_gpio
214 */
to_u300_gpio(struct gpio_chip * chip)215 static inline struct u300_gpio *to_u300_gpio(struct gpio_chip *chip)
216 {
217 return container_of(chip, struct u300_gpio, chip);
218 }
219
u300_gpio_request(struct gpio_chip * chip,unsigned offset)220 static int u300_gpio_request(struct gpio_chip *chip, unsigned offset)
221 {
222 /*
223 * Map back to global GPIO space and request muxing, the direction
224 * parameter does not matter for this controller.
225 */
226 int gpio = chip->base + offset;
227
228 return pinctrl_request_gpio(gpio);
229 }
230
u300_gpio_free(struct gpio_chip * chip,unsigned offset)231 static void u300_gpio_free(struct gpio_chip *chip, unsigned offset)
232 {
233 int gpio = chip->base + offset;
234
235 pinctrl_free_gpio(gpio);
236 }
237
u300_gpio_get(struct gpio_chip * chip,unsigned offset)238 static int u300_gpio_get(struct gpio_chip *chip, unsigned offset)
239 {
240 struct u300_gpio *gpio = to_u300_gpio(chip);
241
242 return readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset);
243 }
244
u300_gpio_set(struct gpio_chip * chip,unsigned offset,int value)245 static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
246 {
247 struct u300_gpio *gpio = to_u300_gpio(chip);
248 unsigned long flags;
249 u32 val;
250
251 local_irq_save(flags);
252
253 val = readl(U300_PIN_REG(offset, dor));
254 if (value)
255 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
256 else
257 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
258
259 local_irq_restore(flags);
260 }
261
u300_gpio_direction_input(struct gpio_chip * chip,unsigned offset)262 static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
263 {
264 struct u300_gpio *gpio = to_u300_gpio(chip);
265 unsigned long flags;
266 u32 val;
267
268 local_irq_save(flags);
269 val = readl(U300_PIN_REG(offset, pcr));
270 /* Mask out this pin, note 2 bits per setting */
271 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
272 writel(val, U300_PIN_REG(offset, pcr));
273 local_irq_restore(flags);
274 return 0;
275 }
276
u300_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)277 static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
278 int value)
279 {
280 struct u300_gpio *gpio = to_u300_gpio(chip);
281 unsigned long flags;
282 u32 oldmode;
283 u32 val;
284
285 local_irq_save(flags);
286 val = readl(U300_PIN_REG(offset, pcr));
287 /*
288 * Drive mode must be set by the special mode set function, set
289 * push/pull mode by default if no mode has been selected.
290 */
291 oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK <<
292 ((offset & 0x07) << 1));
293 /* mode = 0 means input, else some mode is already set */
294 if (oldmode == 0) {
295 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK <<
296 ((offset & 0x07) << 1));
297 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
298 << ((offset & 0x07) << 1));
299 writel(val, U300_PIN_REG(offset, pcr));
300 }
301 u300_gpio_set(chip, offset, value);
302 local_irq_restore(flags);
303 return 0;
304 }
305
306 /* Returning -EINVAL means "supported but not available" */
u300_gpio_config_get(struct gpio_chip * chip,unsigned offset,unsigned long * config)307 int u300_gpio_config_get(struct gpio_chip *chip,
308 unsigned offset,
309 unsigned long *config)
310 {
311 struct u300_gpio *gpio = to_u300_gpio(chip);
312 enum pin_config_param param = (enum pin_config_param) *config;
313 bool biasmode;
314 u32 drmode;
315
316 /* One bit per pin, clamp to bool range */
317 biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset));
318
319 /* Mask out the two bits for this pin and shift to bits 0,1 */
320 drmode = readl(U300_PIN_REG(offset, pcr));
321 drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
322 drmode >>= ((offset & 0x07) << 1);
323
324 switch (param) {
325 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
326 *config = 0;
327 if (biasmode)
328 return 0;
329 else
330 return -EINVAL;
331 break;
332 case PIN_CONFIG_BIAS_PULL_UP:
333 *config = 0;
334 if (!biasmode)
335 return 0;
336 else
337 return -EINVAL;
338 break;
339 case PIN_CONFIG_DRIVE_PUSH_PULL:
340 *config = 0;
341 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL)
342 return 0;
343 else
344 return -EINVAL;
345 break;
346 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
347 *config = 0;
348 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN)
349 return 0;
350 else
351 return -EINVAL;
352 break;
353 case PIN_CONFIG_DRIVE_OPEN_SOURCE:
354 *config = 0;
355 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE)
356 return 0;
357 else
358 return -EINVAL;
359 break;
360 default:
361 break;
362 }
363 return -ENOTSUPP;
364 }
365
u300_gpio_config_set(struct gpio_chip * chip,unsigned offset,enum pin_config_param param)366 int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset,
367 enum pin_config_param param)
368 {
369 struct u300_gpio *gpio = to_u300_gpio(chip);
370 unsigned long flags;
371 u32 val;
372
373 local_irq_save(flags);
374 switch (param) {
375 case PIN_CONFIG_BIAS_DISABLE:
376 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
377 val = readl(U300_PIN_REG(offset, per));
378 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
379 break;
380 case PIN_CONFIG_BIAS_PULL_UP:
381 val = readl(U300_PIN_REG(offset, per));
382 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
383 break;
384 case PIN_CONFIG_DRIVE_PUSH_PULL:
385 val = readl(U300_PIN_REG(offset, pcr));
386 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
387 << ((offset & 0x07) << 1));
388 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
389 << ((offset & 0x07) << 1));
390 writel(val, U300_PIN_REG(offset, pcr));
391 break;
392 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
393 val = readl(U300_PIN_REG(offset, pcr));
394 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
395 << ((offset & 0x07) << 1));
396 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN
397 << ((offset & 0x07) << 1));
398 writel(val, U300_PIN_REG(offset, pcr));
399 break;
400 case PIN_CONFIG_DRIVE_OPEN_SOURCE:
401 val = readl(U300_PIN_REG(offset, pcr));
402 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
403 << ((offset & 0x07) << 1));
404 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE
405 << ((offset & 0x07) << 1));
406 writel(val, U300_PIN_REG(offset, pcr));
407 break;
408 default:
409 local_irq_restore(flags);
410 dev_err(gpio->dev, "illegal configuration requested\n");
411 return -EINVAL;
412 }
413 local_irq_restore(flags);
414 return 0;
415 }
416
417 static struct gpio_chip u300_gpio_chip = {
418 .label = "u300-gpio-chip",
419 .owner = THIS_MODULE,
420 .request = u300_gpio_request,
421 .free = u300_gpio_free,
422 .get = u300_gpio_get,
423 .set = u300_gpio_set,
424 .direction_input = u300_gpio_direction_input,
425 .direction_output = u300_gpio_direction_output,
426 };
427
u300_toggle_trigger(struct u300_gpio * gpio,unsigned offset)428 static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
429 {
430 u32 val;
431
432 val = readl(U300_PIN_REG(offset, icr));
433 /* Set mode depending on state */
434 if (u300_gpio_get(&gpio->chip, offset)) {
435 /* High now, let's trigger on falling edge next then */
436 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
437 dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n",
438 offset);
439 } else {
440 /* Low now, let's trigger on rising edge next then */
441 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
442 dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n",
443 offset);
444 }
445 }
446
u300_gpio_irq_type(struct irq_data * d,unsigned trigger)447 static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
448 {
449 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
450 struct u300_gpio *gpio = to_u300_gpio(chip);
451 struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
452 int offset = d->hwirq;
453 u32 val;
454
455 if ((trigger & IRQF_TRIGGER_RISING) &&
456 (trigger & IRQF_TRIGGER_FALLING)) {
457 /*
458 * The GPIO block can only trigger on falling OR rising edges,
459 * not both. So we need to toggle the mode whenever the pin
460 * goes from one state to the other with a special state flag
461 */
462 dev_dbg(gpio->dev,
463 "trigger on both rising and falling edge on pin %d\n",
464 offset);
465 port->toggle_edge_mode |= U300_PIN_BIT(offset);
466 u300_toggle_trigger(gpio, offset);
467 } else if (trigger & IRQF_TRIGGER_RISING) {
468 dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n",
469 offset);
470 val = readl(U300_PIN_REG(offset, icr));
471 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
472 port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
473 } else if (trigger & IRQF_TRIGGER_FALLING) {
474 dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n",
475 offset);
476 val = readl(U300_PIN_REG(offset, icr));
477 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
478 port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
479 }
480
481 return 0;
482 }
483
u300_gpio_irq_enable(struct irq_data * d)484 static void u300_gpio_irq_enable(struct irq_data *d)
485 {
486 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
487 struct u300_gpio *gpio = to_u300_gpio(chip);
488 struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
489 int offset = d->hwirq;
490 u32 val;
491 unsigned long flags;
492
493 dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n",
494 d->hwirq, port->name, offset);
495 local_irq_save(flags);
496 val = readl(U300_PIN_REG(offset, ien));
497 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
498 local_irq_restore(flags);
499 }
500
u300_gpio_irq_disable(struct irq_data * d)501 static void u300_gpio_irq_disable(struct irq_data *d)
502 {
503 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
504 struct u300_gpio *gpio = to_u300_gpio(chip);
505 int offset = d->hwirq;
506 u32 val;
507 unsigned long flags;
508
509 local_irq_save(flags);
510 val = readl(U300_PIN_REG(offset, ien));
511 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
512 local_irq_restore(flags);
513 }
514
515 static struct irq_chip u300_gpio_irqchip = {
516 .name = "u300-gpio-irqchip",
517 .irq_enable = u300_gpio_irq_enable,
518 .irq_disable = u300_gpio_irq_disable,
519 .irq_set_type = u300_gpio_irq_type,
520 };
521
u300_gpio_irq_handler(unsigned irq,struct irq_desc * desc)522 static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
523 {
524 struct irq_chip *parent_chip = irq_get_chip(irq);
525 struct gpio_chip *chip = irq_get_handler_data(irq);
526 struct u300_gpio *gpio = to_u300_gpio(chip);
527 struct u300_gpio_port *port = &gpio->ports[irq - chip->base];
528 int pinoffset = port->number << 3; /* get the right stride */
529 unsigned long val;
530
531 chained_irq_enter(parent_chip, desc);
532
533 /* Read event register */
534 val = readl(U300_PIN_REG(pinoffset, iev));
535 /* Mask relevant bits */
536 val &= 0xFFU; /* 8 bits per port */
537 /* ACK IRQ (clear event) */
538 writel(val, U300_PIN_REG(pinoffset, iev));
539
540 /* Call IRQ handler */
541 if (val != 0) {
542 int irqoffset;
543
544 for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
545 int offset = pinoffset + irqoffset;
546 int pin_irq = irq_find_mapping(chip->irqdomain, offset);
547
548 dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
549 pin_irq, offset);
550 generic_handle_irq(pin_irq);
551 /*
552 * Triggering IRQ on both rising and falling edge
553 * needs mockery
554 */
555 if (port->toggle_edge_mode & U300_PIN_BIT(offset))
556 u300_toggle_trigger(gpio, offset);
557 }
558 }
559
560 chained_irq_exit(parent_chip, desc);
561 }
562
u300_gpio_init_pin(struct u300_gpio * gpio,int offset,const struct u300_gpio_confdata * conf)563 static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
564 int offset,
565 const struct u300_gpio_confdata *conf)
566 {
567 /* Set mode: input or output */
568 if (conf->output) {
569 u300_gpio_direction_output(&gpio->chip, offset, conf->outval);
570
571 /* Deactivate bias mode for output */
572 u300_gpio_config_set(&gpio->chip, offset,
573 PIN_CONFIG_BIAS_HIGH_IMPEDANCE);
574
575 /* Set drive mode for output */
576 u300_gpio_config_set(&gpio->chip, offset,
577 PIN_CONFIG_DRIVE_PUSH_PULL);
578
579 dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n",
580 offset, conf->outval);
581 } else {
582 u300_gpio_direction_input(&gpio->chip, offset);
583
584 /* Always set output low on input pins */
585 u300_gpio_set(&gpio->chip, offset, 0);
586
587 /* Set bias mode for input */
588 u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode);
589
590 dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n",
591 offset, conf->bias_mode);
592 }
593 }
594
u300_gpio_init_coh901571(struct u300_gpio * gpio)595 static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio)
596 {
597 int i, j;
598
599 /* Write default config and values to all pins */
600 for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
601 for (j = 0; j < 8; j++) {
602 const struct u300_gpio_confdata *conf;
603 int offset = (i*8) + j;
604
605 conf = &bs335_gpio_config[i][j];
606 u300_gpio_init_pin(gpio, offset, conf);
607 }
608 }
609 }
610
611 /*
612 * Here we map a GPIO in the local gpio_chip pin space to a pin in
613 * the local pinctrl pin space. The pin controller used is
614 * pinctrl-u300.
615 */
616 struct coh901_pinpair {
617 unsigned int offset;
618 unsigned int pin_base;
619 };
620
621 #define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b }
622
623 static struct coh901_pinpair coh901_pintable[] = {
624 COH901_PINRANGE(10, 426),
625 COH901_PINRANGE(11, 180),
626 COH901_PINRANGE(12, 165), /* MS/MMC card insertion */
627 COH901_PINRANGE(13, 179),
628 COH901_PINRANGE(14, 178),
629 COH901_PINRANGE(16, 194),
630 COH901_PINRANGE(17, 193),
631 COH901_PINRANGE(18, 192),
632 COH901_PINRANGE(19, 191),
633 COH901_PINRANGE(20, 186),
634 COH901_PINRANGE(21, 185),
635 COH901_PINRANGE(22, 184),
636 COH901_PINRANGE(23, 183),
637 COH901_PINRANGE(24, 182),
638 COH901_PINRANGE(25, 181),
639 };
640
u300_gpio_probe(struct platform_device * pdev)641 static int __init u300_gpio_probe(struct platform_device *pdev)
642 {
643 struct u300_gpio *gpio;
644 struct resource *memres;
645 int err = 0;
646 int portno;
647 u32 val;
648 u32 ifr;
649 int i;
650
651 gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL);
652 if (gpio == NULL)
653 return -ENOMEM;
654
655 gpio->chip = u300_gpio_chip;
656 gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT;
657 gpio->chip.dev = &pdev->dev;
658 gpio->chip.base = 0;
659 gpio->dev = &pdev->dev;
660
661 memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
662 gpio->base = devm_ioremap_resource(&pdev->dev, memres);
663 if (IS_ERR(gpio->base))
664 return PTR_ERR(gpio->base);
665
666 gpio->clk = devm_clk_get(gpio->dev, NULL);
667 if (IS_ERR(gpio->clk)) {
668 err = PTR_ERR(gpio->clk);
669 dev_err(gpio->dev, "could not get GPIO clock\n");
670 return err;
671 }
672
673 err = clk_prepare_enable(gpio->clk);
674 if (err) {
675 dev_err(gpio->dev, "could not enable GPIO clock\n");
676 return err;
677 }
678
679 dev_info(gpio->dev,
680 "initializing GPIO Controller COH 901 571/3\n");
681 gpio->stride = U300_GPIO_PORT_STRIDE;
682 gpio->pcr = U300_GPIO_PXPCR;
683 gpio->dor = U300_GPIO_PXPDOR;
684 gpio->dir = U300_GPIO_PXPDIR;
685 gpio->per = U300_GPIO_PXPER;
686 gpio->icr = U300_GPIO_PXICR;
687 gpio->ien = U300_GPIO_PXIEN;
688 gpio->iev = U300_GPIO_PXIEV;
689 ifr = U300_GPIO_PXIFR;
690
691 val = readl(gpio->base + U300_GPIO_CR);
692 dev_info(gpio->dev, "COH901571/3 block version: %d, " \
693 "number of cores: %d totalling %d pins\n",
694 ((val & 0x000001FC) >> 2),
695 ((val & 0x0000FE00) >> 9),
696 ((val & 0x0000FE00) >> 9) * 8);
697 writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE,
698 gpio->base + U300_GPIO_CR);
699 u300_gpio_init_coh901571(gpio);
700
701 #ifdef CONFIG_OF_GPIO
702 gpio->chip.of_node = pdev->dev.of_node;
703 #endif
704 err = gpiochip_add(&gpio->chip);
705 if (err) {
706 dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
707 goto err_no_chip;
708 }
709
710 err = gpiochip_irqchip_add(&gpio->chip,
711 &u300_gpio_irqchip,
712 0,
713 handle_simple_irq,
714 IRQ_TYPE_EDGE_FALLING);
715 if (err) {
716 dev_err(gpio->dev, "no GPIO irqchip\n");
717 goto err_no_irqchip;
718 }
719
720 /* Add each port with its IRQ separately */
721 for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) {
722 struct u300_gpio_port *port = &gpio->ports[portno];
723
724 snprintf(port->name, 8, "gpio%d", portno);
725 port->number = portno;
726 port->gpio = gpio;
727
728 port->irq = platform_get_irq(pdev, portno);
729
730 gpiochip_set_chained_irqchip(&gpio->chip,
731 &u300_gpio_irqchip,
732 port->irq,
733 u300_gpio_irq_handler);
734
735 /* Turns off irq force (test register) for this port */
736 writel(0x0, gpio->base + portno * gpio->stride + ifr);
737 }
738 dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);
739
740 /*
741 * Add pinctrl pin ranges, the pin controller must be registered
742 * at this point
743 */
744 for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) {
745 struct coh901_pinpair *p = &coh901_pintable[i];
746
747 err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300",
748 p->offset, p->pin_base, 1);
749 if (err)
750 goto err_no_range;
751 }
752
753 platform_set_drvdata(pdev, gpio);
754
755 return 0;
756
757 err_no_range:
758 err_no_irqchip:
759 gpiochip_remove(&gpio->chip);
760 err_no_chip:
761 clk_disable_unprepare(gpio->clk);
762 dev_err(&pdev->dev, "module ERROR:%d\n", err);
763 return err;
764 }
765
u300_gpio_remove(struct platform_device * pdev)766 static int __exit u300_gpio_remove(struct platform_device *pdev)
767 {
768 struct u300_gpio *gpio = platform_get_drvdata(pdev);
769
770 /* Turn off the GPIO block */
771 writel(0x00000000U, gpio->base + U300_GPIO_CR);
772
773 gpiochip_remove(&gpio->chip);
774 clk_disable_unprepare(gpio->clk);
775 return 0;
776 }
777
778 static const struct of_device_id u300_gpio_match[] = {
779 { .compatible = "stericsson,gpio-coh901" },
780 {},
781 };
782
783 static struct platform_driver u300_gpio_driver = {
784 .driver = {
785 .name = "u300-gpio",
786 .of_match_table = u300_gpio_match,
787 },
788 .remove = __exit_p(u300_gpio_remove),
789 };
790
u300_gpio_init(void)791 static int __init u300_gpio_init(void)
792 {
793 return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
794 }
795
u300_gpio_exit(void)796 static void __exit u300_gpio_exit(void)
797 {
798 platform_driver_unregister(&u300_gpio_driver);
799 }
800
801 arch_initcall(u300_gpio_init);
802 module_exit(u300_gpio_exit);
803
804 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
805 MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver");
806 MODULE_LICENSE("GPL");
807