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/*
* Sonics Silicon Backplane
* 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/driver.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/export.h>
#include <linux/ssb/ssb.h>
#include "ssb_private.h"
/**************************************************
* Shared
**************************************************/
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
if (bus->bustype == SSB_BUSTYPE_SSB)
return irq_find_mapping(bus->irq_domain, gpio);
else
return -EINVAL;
}
#endif
/**************************************************
* ChipCommon
**************************************************/
static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
}
static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned int gpio,
int value)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
}
static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
return 0;
}
static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
unsigned int gpio, int value)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
return 0;
}
static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
/* clear pulldown */
ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
/* Set pullup */
ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);
return 0;
}
static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
/* clear pullup */
ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
}
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
{
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
}
static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
{
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));
ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
}
static struct irq_chip ssb_gpio_irq_chipco_chip = {
.name = "SSB-GPIO-CC",
.irq_mask = ssb_gpio_irq_chipco_mask,
.irq_unmask = ssb_gpio_irq_chipco_unmask,
};
static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
{
struct ssb_bus *bus = dev_id;
struct ssb_chipcommon *chipco = &bus->chipco;
u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
unsigned long irqs = (val ^ pol) & mask;
int gpio;
if (!irqs)
return IRQ_NONE;
for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);
return IRQ_HANDLED;
}
static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
{
struct ssb_chipcommon *chipco = &bus->chipco;
struct gpio_chip *chip = &bus->gpio;
int gpio, hwirq, err;
if (bus->bustype != SSB_BUSTYPE_SSB)
return 0;
bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
&irq_domain_simple_ops, chipco);
if (!bus->irq_domain) {
err = -ENODEV;
goto err_irq_domain;
}
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_create_mapping(bus->irq_domain, gpio);
irq_set_chip_data(irq, bus);
irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
handle_simple_irq);
}
hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
"gpio", bus);
if (err)
goto err_req_irq;
ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);
return 0;
err_req_irq:
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_find_mapping(bus->irq_domain, gpio);
irq_dispose_mapping(irq);
}
irq_domain_remove(bus->irq_domain);
err_irq_domain:
return err;
}
static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
{
struct ssb_chipcommon *chipco = &bus->chipco;
struct gpio_chip *chip = &bus->gpio;
int gpio;
if (bus->bustype != SSB_BUSTYPE_SSB)
return;
chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_find_mapping(bus->irq_domain, gpio);
irq_dispose_mapping(irq);
}
irq_domain_remove(bus->irq_domain);
}
#else
static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
{
return 0;
}
static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
{
}
#endif
static int ssb_gpio_chipco_init(struct ssb_bus *bus)
{
struct gpio_chip *chip = &bus->gpio;
int err;
chip->label = "ssb_chipco_gpio";
chip->owner = THIS_MODULE;
chip->request = ssb_gpio_chipco_request
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