[deliverable/linux.git] / drivers / bcma / driver_gpio.c

/*
 * Broadcom specific AMBA
 * GPIO driver
 *
 * Copyright 2011, Broadcom Corporation
 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/export.h>
#include <linux/bcma/bcma.h>

#include "bcma_private.h"

#define BCMA_GPIO_MAX_PINS	32

static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip)
{
	return container_of(chip, struct bcma_drv_cc, gpio);
}

static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	return !!bcma_chipco_gpio_in(cc, 1 << gpio);
}

static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
				int value)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
}

static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
	return 0;
}

static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
				      int value)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
	bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
	return 0;
}

static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	bcma_chipco_gpio_control(cc, 1 << gpio, 0);
	/* clear pulldown */
	bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
	/* Set pullup */
	bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);

	return 0;
}

static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	/* clear pullup */
	bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
}

#if IS_BUILTIN(CONFIG_BCM47XX) || IS_BUILTIN(CONFIG_ARCH_BCM_5301X)
static int bcma_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
{
	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);

	if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
		return irq_find_mapping(cc->irq_domain, gpio);
	else
		return -EINVAL;
}

static void bcma_gpio_irq_unmask(struct irq_data *d)
{
	struct bcma_drv_cc *cc = irq_data_get_irq_chip_data(d);
	int gpio = irqd_to_hwirq(d);
	u32 val = bcma_chipco_gpio_in(cc, BIT(gpio));

	bcma_chipco_gpio_polarity(cc, BIT(gpio), val);
	bcma_chipco_gpio_intmask(cc, BIT(gpio), BIT(gpio));
}

static void bcma_gpio_irq_mask(struct irq_data *d)
{
	struct bcma_drv_cc *cc = irq_data_get_irq_chip_data(d);
	int gpio = irqd_to_hwirq(d);

	bcma_chipco_gpio_intmask(cc, BIT(gpio), 0);
}

static struct irq_chip bcma_gpio_irq_chip = {
	.name		= "BCMA-GPIO",
	.irq_mask	= bcma_gpio_irq_mask,
	.irq_unmask	= bcma_gpio_irq_unmask,
};

static irqreturn_t bcma_gpio_irq_handler(int irq, void *dev_id)
{
	struct bcma_drv_cc *cc = dev_id;
	u32 val = bcma_cc_read32(cc, BCMA_CC_GPIOIN);
	u32 mask = bcma_cc_read32(cc, BCMA_CC_GPIOIRQ);
	u32 pol = bcma_cc_read32(cc, BCMA_CC_GPIOPOL);
	unsigned long irqs = (val ^ pol) & mask;
	int gpio;

	if (!irqs)
		return IRQ_NONE;

	for_each_set_bit(gpio, &irqs, cc->gpio.ngpio)
		generic_handle_irq(bcma_gpio_to_irq(&cc->gpio, gpio));
	bcma_chipco_gpio_polarity(cc, irqs, val & irqs);

	return IRQ_HANDLED;
}

static int bcma_gpio_irq_domain_init(struct bcma_drv_cc *cc)
{
	struct gpio_chip *chip = &cc->gpio;
	int gpio, hwirq, err;

	if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
		return 0;

	cc->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
					       &irq_domain_simple_ops, cc);
	if (!cc->irq_domain) {
		err = -ENODEV;
		goto err_irq_domain;
	}
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
		int irq = irq_create_mapping(cc->irq_domain, gpio);

		irq_set_chip_data(irq, cc);
		irq_set_chip_and_handler(irq, &bcma_gpio_irq_chip,
					 handle_simple_irq);
	}

	hwirq = bcma_core_irq(cc->core, 0);
	err = request_irq(hwirq, bcma_gpio_irq_handler, IRQF_SHARED, "gpio",
			  cc);
	if (err)
		goto err_req_irq;

	bcma_chipco_gpio_intmask(cc, ~0, 0);
	bcma_cc_set32(cc, BCMA_CC_IRQMASK, BCMA_CC_IRQ_GPIO);

	return 0;

err_req_irq:
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
		int irq = irq_find_mapping(cc->irq_domain, gpio);

		irq_dispose_mapping(irq);
	}
	irq_domain_remove(cc->irq_domain);
err_irq_domain:
	return err;
}

static void bcma_gpio_irq_domain_exit(struct bcma_drv_cc *cc)
{
	struct gpio_chip *chip = &cc->gpio;
	int gpio;

	if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
		return;

	bcma_cc_mask32(cc, BCMA_CC_IRQMASK, ~BCMA_CC_IRQ_GPIO);
	free_irq(bcma_core_irq(cc->core, 0), cc);
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
		int irq = irq_find_mapping(cc->irq_domain, gpio);

		irq_dispose_mapping(irq);
	}
	irq_domain_remove(cc->irq_domain);
}
#else
static int bcma_gpio_irq_domain_init(struct bcma_drv_cc *cc)
{
	return 0;
}

static void bcma_gpio_irq_domain_exit(struct bcma_drv_cc *cc)
{
}
#endif

int bcma_gpio_init(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;
	struct gpio_chip *chip = &cc->gpio;
	int err;

	chip->label		= "bcma_gpio";
	chip->owner		= THIS_MODULE;
	chip->request		= bcma_gpio_request;
	chip->free		= bcma_gpio_free;
	chip->get		= bcma_gpio_get_value;
	chip->set		= bcma_gpio_set_value;
	chip->direction_input	= bcma_gpio_direction_input;
	chip->direction_output	= bcma_gpio_direction_output;
#if IS_BUILTIN(CONFIG_BCM47XX) || IS_BUILTIN(CONFIG_ARCH_BCM_5301X)
	chip->to_irq		= bcma_gpio_to_irq;
#endif
#if IS_BUILTIN(CONFIG_OF)
	if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
		chip->of_node	= cc->core->dev.of_node;
#endif
	switch (bus->chipinfo.id) {
	case BCMA_CHIP_ID_BCM4707:
	case BCMA_CHIP_ID_BCM5357:
	case BCMA_CHIP_ID_BCM53572:
		chip->ngpio	= 32;
		break;
	default:
		chip->ngpio	= 16;
	}

	/*
	 * Register SoC GPIO devices with absolute GPIO pin base.
	 * On MIPS, we don't have Device Tree and we can't use relative (per chip)
	 * GPIO numbers.
	 * On some ARM devices, user space may want to access some system GPIO
	 * pins directly, which is easier to do with a predictable GPIO base.
	 */
	if (IS_BUILTIN(CONFIG_BCM47XX) ||
	    cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
		chip->base		= bus->num * BCMA_GPIO_MAX_PINS;
	else
		chip->base		= -1;

	err = bcma_gpio_irq_domain_init(cc);
	if (err)
		return err;

	err = gpiochip_add(chip);
	if (err) {
		bcma_gpio_irq_domain_exit(cc);
		return err;
	}

	return 0;
}

int bcma_gpio_unregister(struct bcma_drv_cc *cc)
{
	bcma_gpio_irq_domain_exit(cc);
	gpiochip_remove(&cc->gpio);
	return 0;
}
Commit	Line	Data
cf0936b0 HM	1	/*
	2	* Broadcom specific AMBA
	3	* GPIO driver
	4	*
	5	* Copyright 2011, Broadcom Corporation
	6	* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
	7	*
	8	* Licensed under the GNU/GPL. See COPYING for details.
	9	*/
	10
	11	#include <linux/gpio.h>
2997609e RM	12	#include <linux/irq.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/irqdomain.h>
cf0936b0 HM	15	#include <linux/export.h>
	16	#include <linux/bcma/bcma.h>
	17
	18	#include "bcma_private.h"
	19
057fcd42 RM	20	#define BCMA_GPIO_MAX_PINS 32
057fcd42 RM	21
cf0936b0 HM	22	static inline struct bcma_drv_cc bcma_gpio_get_cc(struct gpio_chip chip)
	23	{
	24	return container_of(chip, struct bcma_drv_cc, gpio);
	25	}
	26
	27	static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
	28	{
	29	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	30
	31	return !!bcma_chipco_gpio_in(cc, 1 << gpio);
	32	}
	33
	34	static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
	35	int value)
	36	{
	37	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	38
	39	bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
	40	}
	41
	42	static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
	43	{
	44	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	45
	46	bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
	47	return 0;
	48	}
	49
	50	static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
	51	int value)
	52	{
	53	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	54
	55	bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
	56	bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
	57	return 0;
	58	}
	59
	60	static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
	61	{
	62	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	63
	64	bcma_chipco_gpio_control(cc, 1 << gpio, 0);
	65	/* clear pulldown */
	66	bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
	67	/* Set pullup */
	68	bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
	69
	70	return 0;
	71	}
	72
	73	static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
	74	{
	75	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	76
	77	/* clear pullup */
	78	bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
	79	}
	80
0cbfc065	81	#if IS_BUILTIN(CONFIG_BCM47XX) \|\| IS_BUILTIN(CONFIG_ARCH_BCM_5301X)
8f1ca268 HM	82	static int bcma_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
	83	{
	84	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
	85
	86	if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
2997609e	87	return irq_find_mapping(cc->irq_domain, gpio);
8f1ca268 HM	88	else
	89	return -EINVAL;
	90	}
	91
2997609e RM	92	static void bcma_gpio_irq_unmask(struct irq_data *d)
	93	{
	94	struct bcma_drv_cc *cc = irq_data_get_irq_chip_data(d);
	95	int gpio = irqd_to_hwirq(d);
978e55d2	96	u32 val = bcma_chipco_gpio_in(cc, BIT(gpio));
2997609e	97
978e55d2	98	bcma_chipco_gpio_polarity(cc, BIT(gpio), val);
2997609e RM	99	bcma_chipco_gpio_intmask(cc, BIT(gpio), BIT(gpio));
	100	}
	101
	102	static void bcma_gpio_irq_mask(struct irq_data *d)
	103	{
	104	struct bcma_drv_cc *cc = irq_data_get_irq_chip_data(d);
	105	int gpio = irqd_to_hwirq(d);
	106
	107	bcma_chipco_gpio_intmask(cc, BIT(gpio), 0);
	108	}
	109
	110	static struct irq_chip bcma_gpio_irq_chip = {
	111	.name = "BCMA-GPIO",
	112	.irq_mask = bcma_gpio_irq_mask,
	113	.irq_unmask = bcma_gpio_irq_unmask,
	114	};
	115
	116	static irqreturn_t bcma_gpio_irq_handler(int irq, void *dev_id)
	117	{
	118	struct bcma_drv_cc *cc = dev_id;
	119	u32 val = bcma_cc_read32(cc, BCMA_CC_GPIOIN);
	120	u32 mask = bcma_cc_read32(cc, BCMA_CC_GPIOIRQ);
	121	u32 pol = bcma_cc_read32(cc, BCMA_CC_GPIOPOL);
d5ab2adb	122	unsigned long irqs = (val ^ pol) & mask;
2997609e RM	123	int gpio;
	124
	125	if (!irqs)
	126	return IRQ_NONE;
	127
d5ab2adb	128	for_each_set_bit(gpio, &irqs, cc->gpio.ngpio)
2997609e RM	129	generic_handle_irq(bcma_gpio_to_irq(&cc->gpio, gpio));
	130	bcma_chipco_gpio_polarity(cc, irqs, val & irqs);
	131
	132	return IRQ_HANDLED;
	133	}
	134
	135	static int bcma_gpio_irq_domain_init(struct bcma_drv_cc *cc)
	136	{
	137	struct gpio_chip *chip = &cc->gpio;
	138	int gpio, hwirq, err;
	139
	140	if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
	141	return 0;
	142
	143	cc->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
	144	&irq_domain_simple_ops, cc);
	145	if (!cc->irq_domain) {
	146	err = -ENODEV;
	147	goto err_irq_domain;
	148	}
	149	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	150	int irq = irq_create_mapping(cc->irq_domain, gpio);
	151
	152	irq_set_chip_data(irq, cc);
	153	irq_set_chip_and_handler(irq, &bcma_gpio_irq_chip,
	154	handle_simple_irq);
	155	}
	156
85eb92e8	157	hwirq = bcma_core_irq(cc->core, 0);
2997609e RM	158	err = request_irq(hwirq, bcma_gpio_irq_handler, IRQF_SHARED, "gpio",
	159	cc);
	160	if (err)
	161	goto err_req_irq;
	162
978e55d2	163	bcma_chipco_gpio_intmask(cc, ~0, 0);
2997609e RM	164	bcma_cc_set32(cc, BCMA_CC_IRQMASK, BCMA_CC_IRQ_GPIO);
	165
	166	return 0;
	167
	168	err_req_irq:
	169	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	170	int irq = irq_find_mapping(cc->irq_domain, gpio);
	171
	172	irq_dispose_mapping(irq);
	173	}
	174	irq_domain_remove(cc->irq_domain);
	175	err_irq_domain:
	176	return err;
	177	}
	178
	179	static void bcma_gpio_irq_domain_exit(struct bcma_drv_cc *cc)
	180	{
	181	struct gpio_chip *chip = &cc->gpio;
	182	int gpio;
	183
	184	if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
	185	return;
	186
	187	bcma_cc_mask32(cc, BCMA_CC_IRQMASK, ~BCMA_CC_IRQ_GPIO);
85eb92e8	188	free_irq(bcma_core_irq(cc->core, 0), cc);
2997609e RM	189	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	190	int irq = irq_find_mapping(cc->irq_domain, gpio);
	191
	192	irq_dispose_mapping(irq);
	193	}
	194	irq_domain_remove(cc->irq_domain);
	195	}
	196	#else
	197	static int bcma_gpio_irq_domain_init(struct bcma_drv_cc *cc)
	198	{
	199	return 0;
	200	}
	201
	202	static void bcma_gpio_irq_domain_exit(struct bcma_drv_cc *cc)
	203	{
	204	}
	205	#endif
	206
cf0936b0 HM	207	int bcma_gpio_init(struct bcma_drv_cc *cc)
cf0936b0 HM	208	{
057fcd42	209	struct bcma_bus *bus = cc->core->bus;
cf0936b0	210	struct gpio_chip *chip = &cc->gpio;
2997609e	211	int err;
cf0936b0 HM	212
	213	chip->label = "bcma_gpio";
	214	chip->owner = THIS_MODULE;
	215	chip->request = bcma_gpio_request;
	216	chip->free = bcma_gpio_free;
	217	chip->get = bcma_gpio_get_value;
	218	chip->set = bcma_gpio_set_value;
	219	chip->direction_input = bcma_gpio_direction_input;
	220	chip->direction_output = bcma_gpio_direction_output;
0cbfc065	221	#if IS_BUILTIN(CONFIG_BCM47XX) \|\| IS_BUILTIN(CONFIG_ARCH_BCM_5301X)
8f1ca268	222	chip->to_irq = bcma_gpio_to_irq;
a0196d11 RM	223	#endif
	224	#if IS_BUILTIN(CONFIG_OF)
	225	if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
	226	chip->of_node = cc->core->dev.of_node;
2997609e	227	#endif
057fcd42	228	switch (bus->chipinfo.id) {
f022ea52	229	case BCMA_CHIP_ID_BCM4707:
0f8ca014	230	case BCMA_CHIP_ID_BCM5357:
f0db59e1	231	case BCMA_CHIP_ID_BCM53572:
0f8ca014 RM	232	chip->ngpio = 32;
	233	break;
	234	default:
	235	chip->ngpio = 16;
	236	}
	237
057fcd42	238	/*
2d57b712 FF	239	* Register SoC GPIO devices with absolute GPIO pin base.
	240	* On MIPS, we don't have Device Tree and we can't use relative (per chip)
	241	* GPIO numbers.
	242	* On some ARM devices, user space may want to access some system GPIO
	243	* pins directly, which is easier to do with a predictable GPIO base.
057fcd42	244	*/
2d57b712 FF	245	if (IS_BUILTIN(CONFIG_BCM47XX) \|\|
	246	cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
	247	chip->base = bus->num * BCMA_GPIO_MAX_PINS;
	248	else
	249	chip->base = -1;
cf0936b0	250
2997609e RM	251	err = bcma_gpio_irq_domain_init(cc);
	252	if (err)
	253	return err;
	254
	255	err = gpiochip_add(chip);
	256	if (err) {
	257	bcma_gpio_irq_domain_exit(cc);
	258	return err;
	259	}
	260
	261	return 0;
cf0936b0	262	}
c50ae947 HM	263
	264	int bcma_gpio_unregister(struct bcma_drv_cc *cc)
	265	{
2997609e	266	bcma_gpio_irq_domain_exit(cc);
88d5e520	267	gpiochip_remove(&cc->gpio);
88d5e520	268	return 0;
c50ae947	269	}