linux/drivers/bcma/driver_gpio.c
Rafał Miłecki 0f8ca01461 bcma: gpio: register 32 GPIOs on BCM5357
Some Broadcom boards have more GPIOs available. For example Linksys
E3200 home router is based on SoC id 0x5357, package 0x0A and uses GPIO
23 to reset internal USB WiFi (gpio23=wombo_reset).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2014-03-27 14:20:04 -04:00

255 lines
5.9 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"
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_BCMA_HOST_SOC)
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);
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), 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 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_BCMA_HOST_SOC)
chip->to_irq = bcma_gpio_to_irq;
#endif
switch (cc->core->bus->chipinfo.id) {
case BCMA_CHIP_ID_BCM5357:
chip->ngpio = 32;
break;
default:
chip->ngpio = 16;
}
/* There is just one SoC in one device and its GPIO addresses should be
* deterministic to address them more easily. The other buses could get
* a random base number. */
if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
chip->base = 0;
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);
return gpiochip_remove(&cc->gpio);
}