4 * Copyright (C) 2007-2011 ST-Ericsson AB
5 * License terms: GNU General Public License (GPL) version 2
6 * This can driver either of the two basic GPIO cores
7 * available in the U300 platforms:
8 * COH 901 335 - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0)
9 * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
10 * Author: Linus Walleij <linus.walleij@linaro.org>
11 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
13 #include <linux/module.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/delay.h>
17 #include <linux/errno.h>
19 #include <linux/clk.h>
20 #include <linux/err.h>
21 #include <linux/platform_device.h>
22 #include <linux/gpio.h>
23 #include <linux/list.h>
24 #include <linux/slab.h>
25 #include <linux/pinctrl/consumer.h>
26 #include <linux/pinctrl/pinconf-generic.h>
27 #include <mach/gpio-u300.h>
28 #include "pinctrl-coh901.h"
31 * Register definitions for COH 901 335 variant
33 #define U300_335_PORT_STRIDE (0x1C)
34 /* Port X Pin Data Register 32bit, this is both input and output (R/W) */
35 #define U300_335_PXPDIR (0x00)
36 #define U300_335_PXPDOR (0x00)
37 /* Port X Pin Config Register 32bit (R/W) */
38 #define U300_335_PXPCR (0x04)
39 /* This register layout is the same in both blocks */
40 #define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK (0x0000FFFFUL)
41 #define U300_GPIO_PXPCR_PIN_MODE_MASK (0x00000003UL)
42 #define U300_GPIO_PXPCR_PIN_MODE_SHIFT (0x00000002UL)
43 #define U300_GPIO_PXPCR_PIN_MODE_INPUT (0x00000000UL)
44 #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL (0x00000001UL)
45 #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN (0x00000002UL)
46 #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE (0x00000003UL)
47 /* Port X Interrupt Event Register 32bit (R/W) */
48 #define U300_335_PXIEV (0x08)
49 /* Port X Interrupt Enable Register 32bit (R/W) */
50 #define U300_335_PXIEN (0x0C)
51 /* Port X Interrupt Force Register 32bit (R/W) */
52 #define U300_335_PXIFR (0x10)
53 /* Port X Interrupt Config Register 32bit (R/W) */
54 #define U300_335_PXICR (0x14)
55 /* This register layout is the same in both blocks */
56 #define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK (0x000000FFUL)
57 #define U300_GPIO_PXICR_IRQ_CONFIG_MASK (0x00000001UL)
58 #define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE (0x00000000UL)
59 #define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE (0x00000001UL)
60 /* Port X Pull-up Enable Register 32bit (R/W) */
61 #define U300_335_PXPER (0x18)
62 /* This register layout is the same in both blocks */
63 #define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK (0x000000FFUL)
64 #define U300_GPIO_PXPER_PULL_UP_DISABLE (0x00000001UL)
65 /* Control Register 32bit (R/W) */
66 #define U300_335_CR (0x54)
67 #define U300_335_CR_BLOCK_CLOCK_ENABLE (0x00000001UL)
70 * Register definitions for COH 901 571 / 3 variant
72 #define U300_571_PORT_STRIDE (0x30)
74 * Control Register 32bit (R/W)
75 * bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores
76 * gives the number of GPIO pins.
77 * bit 8-2 (mask 0x000001FC) contains the core version ID.
79 #define U300_571_CR (0x00)
80 #define U300_571_CR_SYNC_SEL_ENABLE (0x00000002UL)
81 #define U300_571_CR_BLOCK_CLKRQ_ENABLE (0x00000001UL)
83 * These registers have the same layout and function as the corresponding
84 * COH 901 335 registers, just at different offset.
86 #define U300_571_PXPDIR (0x04)
87 #define U300_571_PXPDOR (0x08)
88 #define U300_571_PXPCR (0x0C)
89 #define U300_571_PXPER (0x10)
90 #define U300_571_PXIEV (0x14)
91 #define U300_571_PXIEN (0x18)
92 #define U300_571_PXIFR (0x1C)
93 #define U300_571_PXICR (0x20)
95 /* 8 bits per port, no version has more than 7 ports */
96 #define U300_GPIO_PINS_PER_PORT 8
97 #define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * 7)
100 struct gpio_chip chip;
101 struct list_head port_list;
103 struct resource *memres;
108 /* Register offsets */
118 struct u300_gpio_port {
119 struct list_head node;
120 struct u300_gpio *gpio;
128 * Macro to expand to read a specific register found in the "gpio"
129 * struct. It requires the struct u300_gpio *gpio variable to exist in
130 * its context. It calculates the port offset from the given pin
131 * offset, muliplies by the port stride and adds the register offset
132 * so it provides a pointer to the desired register.
134 #define U300_PIN_REG(pin, reg) \
135 (gpio->base + (pin >> 3) * gpio->stride + gpio->reg)
138 * Provides a bitmask for a specific gpio pin inside an 8-bit GPIO
141 #define U300_PIN_BIT(pin) \
144 struct u300_gpio_confdata {
150 /* BS335 has seven ports of 8 bits each = GPIO pins 0..55 */
151 #define BS335_GPIO_NUM_PORTS 7
152 /* BS365 has five ports of 8 bits each = GPIO pins 0..39 */
153 #define BS365_GPIO_NUM_PORTS 5
155 #define U300_FLOATING_INPUT { \
156 .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \
160 #define U300_PULL_UP_INPUT { \
161 .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \
165 #define U300_OUTPUT_LOW { \
170 #define U300_OUTPUT_HIGH { \
176 /* Initial configuration */
177 static const struct __initdata u300_gpio_confdata
178 bs335_gpio_config[BS335_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
179 /* Port 0, pins 0-7 */
190 /* Port 1, pins 0-7 */
201 /* Port 2, pins 0-7 */
212 /* Port 3, pins 0-7 */
223 /* Port 4, pins 0-7 */
234 /* Port 5, pins 0-7 */
245 /* Port 6, pind 0-7 */
258 static const struct __initdata u300_gpio_confdata
259 bs365_gpio_config[BS365_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
260 /* Port 0, pins 0-7 */
271 /* Port 1, pins 0-7 */
282 /* Port 2, pins 0-7 */
293 /* Port 3, pins 0-7 */
304 /* Port 4, pins 0-7 */
310 /* These 4 pins doesn't exist on DB3210 */
319 * to_u300_gpio() - get the pointer to u300_gpio
320 * @chip: the gpio chip member of the structure u300_gpio
322 static inline struct u300_gpio *to_u300_gpio(struct gpio_chip *chip)
324 return container_of(chip, struct u300_gpio, chip);
327 static int u300_gpio_request(struct gpio_chip *chip, unsigned offset)
330 * Map back to global GPIO space and request muxing, the direction
331 * parameter does not matter for this controller.
333 int gpio = chip->base + offset;
335 return pinctrl_request_gpio(gpio);
338 static void u300_gpio_free(struct gpio_chip *chip, unsigned offset)
340 int gpio = chip->base + offset;
342 pinctrl_free_gpio(gpio);
345 static int u300_gpio_get(struct gpio_chip *chip, unsigned offset)
347 struct u300_gpio *gpio = to_u300_gpio(chip);
349 return readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset);
352 static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
354 struct u300_gpio *gpio = to_u300_gpio(chip);
358 local_irq_save(flags);
360 val = readl(U300_PIN_REG(offset, dor));
362 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
364 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
366 local_irq_restore(flags);
369 static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
371 struct u300_gpio *gpio = to_u300_gpio(chip);
375 local_irq_save(flags);
376 val = readl(U300_PIN_REG(offset, pcr));
377 /* Mask out this pin, note 2 bits per setting */
378 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
379 writel(val, U300_PIN_REG(offset, pcr));
380 local_irq_restore(flags);
384 static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
387 struct u300_gpio *gpio = to_u300_gpio(chip);
392 local_irq_save(flags);
393 val = readl(U300_PIN_REG(offset, pcr));
395 * Drive mode must be set by the special mode set function, set
396 * push/pull mode by default if no mode has been selected.
398 oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK <<
399 ((offset & 0x07) << 1));
400 /* mode = 0 means input, else some mode is already set */
402 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK <<
403 ((offset & 0x07) << 1));
404 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
405 << ((offset & 0x07) << 1));
406 writel(val, U300_PIN_REG(offset, pcr));
408 u300_gpio_set(chip, offset, value);
409 local_irq_restore(flags);
413 static int u300_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
415 struct u300_gpio *gpio = to_u300_gpio(chip);
416 int retirq = gpio->irq_base + offset;
418 dev_dbg(gpio->dev, "request IRQ for GPIO %d, return %d\n", offset,
423 /* Returning -EINVAL means "supported but not available" */
424 int u300_gpio_config_get(struct gpio_chip *chip,
426 unsigned long *config)
428 struct u300_gpio *gpio = to_u300_gpio(chip);
429 enum pin_config_param param = (enum pin_config_param) *config;
433 /* One bit per pin, clamp to bool range */
434 biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset));
436 /* Mask out the two bits for this pin and shift to bits 0,1 */
437 drmode = readl(U300_PIN_REG(offset, pcr));
438 drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
439 drmode >>= ((offset & 0x07) << 1);
442 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
449 case PIN_CONFIG_BIAS_PULL_UP:
456 case PIN_CONFIG_DRIVE_PUSH_PULL:
458 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL)
463 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
465 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN)
470 case PIN_CONFIG_DRIVE_OPEN_SOURCE:
472 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE)
483 int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset,
484 enum pin_config_param param)
486 struct u300_gpio *gpio = to_u300_gpio(chip);
490 local_irq_save(flags);
492 case PIN_CONFIG_BIAS_DISABLE:
493 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
494 val = readl(U300_PIN_REG(offset, per));
495 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
497 case PIN_CONFIG_BIAS_PULL_UP:
498 val = readl(U300_PIN_REG(offset, per));
499 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
501 case PIN_CONFIG_DRIVE_PUSH_PULL:
502 val = readl(U300_PIN_REG(offset, pcr));
503 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
504 << ((offset & 0x07) << 1));
505 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
506 << ((offset & 0x07) << 1));
507 writel(val, U300_PIN_REG(offset, pcr));
509 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
510 val = readl(U300_PIN_REG(offset, pcr));
511 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
512 << ((offset & 0x07) << 1));
513 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN
514 << ((offset & 0x07) << 1));
515 writel(val, U300_PIN_REG(offset, pcr));
517 case PIN_CONFIG_DRIVE_OPEN_SOURCE:
518 val = readl(U300_PIN_REG(offset, pcr));
519 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
520 << ((offset & 0x07) << 1));
521 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE
522 << ((offset & 0x07) << 1));
523 writel(val, U300_PIN_REG(offset, pcr));
526 local_irq_restore(flags);
527 dev_err(gpio->dev, "illegal configuration requested\n");
530 local_irq_restore(flags);
534 static struct gpio_chip u300_gpio_chip = {
535 .label = "u300-gpio-chip",
536 .owner = THIS_MODULE,
537 .request = u300_gpio_request,
538 .free = u300_gpio_free,
539 .get = u300_gpio_get,
540 .set = u300_gpio_set,
541 .direction_input = u300_gpio_direction_input,
542 .direction_output = u300_gpio_direction_output,
543 .to_irq = u300_gpio_to_irq,
546 static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
550 val = readl(U300_PIN_REG(offset, icr));
551 /* Set mode depending on state */
552 if (u300_gpio_get(&gpio->chip, offset)) {
553 /* High now, let's trigger on falling edge next then */
554 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
555 dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n",
558 /* Low now, let's trigger on rising edge next then */
559 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
560 dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n",
565 static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
567 struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
568 struct u300_gpio *gpio = port->gpio;
569 int offset = d->irq - gpio->irq_base;
572 if ((trigger & IRQF_TRIGGER_RISING) &&
573 (trigger & IRQF_TRIGGER_FALLING)) {
575 * The GPIO block can only trigger on falling OR rising edges,
576 * not both. So we need to toggle the mode whenever the pin
577 * goes from one state to the other with a special state flag
580 "trigger on both rising and falling edge on pin %d\n",
582 port->toggle_edge_mode |= U300_PIN_BIT(offset);
583 u300_toggle_trigger(gpio, offset);
584 } else if (trigger & IRQF_TRIGGER_RISING) {
585 dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n",
587 val = readl(U300_PIN_REG(offset, icr));
588 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
589 port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
590 } else if (trigger & IRQF_TRIGGER_FALLING) {
591 dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n",
593 val = readl(U300_PIN_REG(offset, icr));
594 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
595 port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
601 static void u300_gpio_irq_enable(struct irq_data *d)
603 struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
604 struct u300_gpio *gpio = port->gpio;
605 int offset = d->irq - gpio->irq_base;
609 local_irq_save(flags);
610 val = readl(U300_PIN_REG(offset, ien));
611 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
612 local_irq_restore(flags);
615 static void u300_gpio_irq_disable(struct irq_data *d)
617 struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
618 struct u300_gpio *gpio = port->gpio;
619 int offset = d->irq - gpio->irq_base;
623 local_irq_save(flags);
624 val = readl(U300_PIN_REG(offset, ien));
625 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
626 local_irq_restore(flags);
629 static struct irq_chip u300_gpio_irqchip = {
630 .name = "u300-gpio-irqchip",
631 .irq_enable = u300_gpio_irq_enable,
632 .irq_disable = u300_gpio_irq_disable,
633 .irq_set_type = u300_gpio_irq_type,
637 static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
639 struct u300_gpio_port *port = irq_get_handler_data(irq);
640 struct u300_gpio *gpio = port->gpio;
641 int pinoffset = port->number << 3; /* get the right stride */
644 desc->irq_data.chip->irq_ack(&desc->irq_data);
645 /* Read event register */
646 val = readl(U300_PIN_REG(pinoffset, iev));
647 /* Mask relevant bits */
648 val &= 0xFFU; /* 8 bits per port */
649 /* ACK IRQ (clear event) */
650 writel(val, U300_PIN_REG(pinoffset, iev));
652 /* Call IRQ handler */
656 for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
657 int pin_irq = gpio->irq_base + (port->number << 3)
659 int offset = pinoffset + irqoffset;
661 dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
663 generic_handle_irq(pin_irq);
665 * Triggering IRQ on both rising and falling edge
668 if (port->toggle_edge_mode & U300_PIN_BIT(offset))
669 u300_toggle_trigger(gpio, offset);
673 desc->irq_data.chip->irq_unmask(&desc->irq_data);
676 static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
678 const struct u300_gpio_confdata *conf)
680 /* Set mode: input or output */
682 u300_gpio_direction_output(&gpio->chip, offset, conf->outval);
684 /* Deactivate bias mode for output */
685 u300_gpio_config_set(&gpio->chip, offset,
686 PIN_CONFIG_BIAS_HIGH_IMPEDANCE);
688 /* Set drive mode for output */
689 u300_gpio_config_set(&gpio->chip, offset,
690 PIN_CONFIG_DRIVE_PUSH_PULL);
692 dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n",
693 offset, conf->outval);
695 u300_gpio_direction_input(&gpio->chip, offset);
697 /* Always set output low on input pins */
698 u300_gpio_set(&gpio->chip, offset, 0);
700 /* Set bias mode for input */
701 u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode);
703 dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n",
704 offset, conf->bias_mode);
708 static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio,
709 struct u300_gpio_platform *plat)
713 /* Write default config and values to all pins */
714 for (i = 0; i < plat->ports; i++) {
715 for (j = 0; j < 8; j++) {
716 const struct u300_gpio_confdata *conf;
717 int offset = (i*8) + j;
719 if (plat->variant == U300_GPIO_COH901571_3_BS335)
720 conf = &bs335_gpio_config[i][j];
721 else if (plat->variant == U300_GPIO_COH901571_3_BS365)
722 conf = &bs365_gpio_config[i][j];
726 u300_gpio_init_pin(gpio, offset, conf);
731 static inline void u300_gpio_free_ports(struct u300_gpio *gpio)
733 struct u300_gpio_port *port;
734 struct list_head *p, *n;
736 list_for_each_safe(p, n, &gpio->port_list) {
737 port = list_entry(p, struct u300_gpio_port, node);
738 list_del(&port->node);
743 static int __init u300_gpio_probe(struct platform_device *pdev)
745 struct u300_gpio_platform *plat = dev_get_platdata(&pdev->dev);
746 struct u300_gpio *gpio;
753 gpio = kzalloc(sizeof(struct u300_gpio), GFP_KERNEL);
755 dev_err(&pdev->dev, "failed to allocate memory\n");
759 gpio->chip = u300_gpio_chip;
760 gpio->chip.ngpio = plat->ports * U300_GPIO_PINS_PER_PORT;
761 gpio->irq_base = plat->gpio_irq_base;
762 gpio->chip.dev = &pdev->dev;
763 gpio->chip.base = plat->gpio_base;
764 gpio->dev = &pdev->dev;
767 gpio->clk = clk_get(gpio->dev, NULL);
768 if (IS_ERR(gpio->clk)) {
769 err = PTR_ERR(gpio->clk);
770 dev_err(gpio->dev, "could not get GPIO clock\n");
773 err = clk_enable(gpio->clk);
775 dev_err(gpio->dev, "could not enable GPIO clock\n");
776 goto err_no_clk_enable;
779 gpio->memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
781 dev_err(gpio->dev, "could not get GPIO memory resource\n");
783 goto err_no_resource;
786 if (!request_mem_region(gpio->memres->start,
787 resource_size(gpio->memres),
788 "GPIO Controller")) {
790 goto err_no_ioregion;
793 gpio->base = ioremap(gpio->memres->start, resource_size(gpio->memres));
799 if (plat->variant == U300_GPIO_COH901335) {
801 "initializing GPIO Controller COH 901 335\n");
802 gpio->stride = U300_335_PORT_STRIDE;
803 gpio->pcr = U300_335_PXPCR;
804 gpio->dor = U300_335_PXPDOR;
805 gpio->dir = U300_335_PXPDIR;
806 gpio->per = U300_335_PXPER;
807 gpio->icr = U300_335_PXICR;
808 gpio->ien = U300_335_PXIEN;
809 gpio->iev = U300_335_PXIEV;
810 ifr = U300_335_PXIFR;
812 /* Turn on the GPIO block */
813 writel(U300_335_CR_BLOCK_CLOCK_ENABLE,
814 gpio->base + U300_335_CR);
815 } else if (plat->variant == U300_GPIO_COH901571_3_BS335 ||
816 plat->variant == U300_GPIO_COH901571_3_BS365) {
818 "initializing GPIO Controller COH 901 571/3\n");
819 gpio->stride = U300_571_PORT_STRIDE;
820 gpio->pcr = U300_571_PXPCR;
821 gpio->dor = U300_571_PXPDOR;
822 gpio->dir = U300_571_PXPDIR;
823 gpio->per = U300_571_PXPER;
824 gpio->icr = U300_571_PXICR;
825 gpio->ien = U300_571_PXIEN;
826 gpio->iev = U300_571_PXIEV;
827 ifr = U300_571_PXIFR;
829 val = readl(gpio->base + U300_571_CR);
830 dev_info(gpio->dev, "COH901571/3 block version: %d, " \
831 "number of cores: %d totalling %d pins\n",
832 ((val & 0x000001FC) >> 2),
833 ((val & 0x0000FE00) >> 9),
834 ((val & 0x0000FE00) >> 9) * 8);
835 writel(U300_571_CR_BLOCK_CLKRQ_ENABLE,
836 gpio->base + U300_571_CR);
837 u300_gpio_init_coh901571(gpio, plat);
839 dev_err(gpio->dev, "unknown block variant\n");
841 goto err_unknown_variant;
844 /* Add each port with its IRQ separately */
845 INIT_LIST_HEAD(&gpio->port_list);
846 for (portno = 0 ; portno < plat->ports; portno++) {
847 struct u300_gpio_port *port =
848 kmalloc(sizeof(struct u300_gpio_port), GFP_KERNEL);
851 dev_err(gpio->dev, "out of memory\n");
856 snprintf(port->name, 8, "gpio%d", portno);
857 port->number = portno;
860 port->irq = platform_get_irq_byname(pdev,
863 dev_dbg(gpio->dev, "register IRQ %d for %s\n", port->irq,
866 irq_set_chained_handler(port->irq, u300_gpio_irq_handler);
867 irq_set_handler_data(port->irq, port);
869 /* For each GPIO pin set the unique IRQ handler */
870 for (i = 0; i < U300_GPIO_PINS_PER_PORT; i++) {
871 int irqno = gpio->irq_base + (portno << 3) + i;
873 dev_dbg(gpio->dev, "handler for IRQ %d on %s\n",
875 irq_set_chip_and_handler(irqno, &u300_gpio_irqchip,
877 set_irq_flags(irqno, IRQF_VALID);
878 irq_set_chip_data(irqno, port);
881 /* Turns off irq force (test register) for this port */
882 writel(0x0, gpio->base + portno * gpio->stride + ifr);
884 list_add_tail(&port->node, &gpio->port_list);
886 dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);
888 err = gpiochip_add(&gpio->chip);
890 dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
894 /* Spawn pin controller device as child of the GPIO, pass gpio chip */
895 plat->pinctrl_device->dev.platform_data = &gpio->chip;
896 err = platform_device_register(plat->pinctrl_device);
900 platform_set_drvdata(pdev, gpio);
905 err = gpiochip_remove(&gpio->chip);
908 u300_gpio_free_ports(gpio);
912 release_mem_region(gpio->memres->start, resource_size(gpio->memres));
915 clk_disable(gpio->clk);
920 dev_info(&pdev->dev, "module ERROR:%d\n", err);
924 static int __exit u300_gpio_remove(struct platform_device *pdev)
926 struct u300_gpio_platform *plat = dev_get_platdata(&pdev->dev);
927 struct u300_gpio *gpio = platform_get_drvdata(pdev);
930 /* Turn off the GPIO block */
931 if (plat->variant == U300_GPIO_COH901335)
932 writel(0x00000000U, gpio->base + U300_335_CR);
933 if (plat->variant == U300_GPIO_COH901571_3_BS335 ||
934 plat->variant == U300_GPIO_COH901571_3_BS365)
935 writel(0x00000000U, gpio->base + U300_571_CR);
937 err = gpiochip_remove(&gpio->chip);
939 dev_err(gpio->dev, "unable to remove gpiochip: %d\n", err);
942 u300_gpio_free_ports(gpio);
944 release_mem_region(gpio->memres->start,
945 resource_size(gpio->memres));
946 clk_disable(gpio->clk);
948 platform_set_drvdata(pdev, NULL);
953 static struct platform_driver u300_gpio_driver = {
957 .remove = __exit_p(u300_gpio_remove),
960 static int __init u300_gpio_init(void)
962 return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
965 static void __exit u300_gpio_exit(void)
967 platform_driver_unregister(&u300_gpio_driver);
970 arch_initcall(u300_gpio_init);
971 module_exit(u300_gpio_exit);
973 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
974 MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver");
975 MODULE_LICENSE("GPL");