270 lines
6.4 KiB
C
270 lines
6.4 KiB
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;
|
|
}
|