Commit 7c1bc0da authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Ralf Baechle

ssb: gpio: add own IRQ domain

Signed-off-by: default avatarRafał Miłecki <zajec5@gmail.com>
Acked-by: default avatarHauke Mehrtens <hauke@hauke-m.de>
Acked-by: default avatarMichael Buesch <m@bues.ch>
Signed-off-by: default avatarJohn Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6342/
parent 89fb3ac8
......@@ -168,6 +168,7 @@ config SSB_DRIVER_GIGE
config SSB_DRIVER_GPIO
bool "SSB GPIO driver"
depends on SSB && GPIOLIB
select IRQ_DOMAIN if SSB_EMBEDDED
help
Driver to provide access to the GPIO pins on the bus.
......
......@@ -9,16 +9,40 @@
*/
#include <linux/gpio.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
**************************************************/
static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip)
{
return container_of(chip, struct ssb_bus, gpio);
}
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
{
struct ssb_bus *bus = ssb_gpio_get_bus(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 gpio)
{
struct ssb_bus *bus = ssb_gpio_get_bus(chip);
......@@ -74,19 +98,129 @@ static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio)
ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
}
static int ssb_gpio_chipco_to_irq(struct gpio_chip *chip, unsigned gpio)
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
{
struct ssb_bus *bus = ssb_gpio_get_bus(chip);
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
if (bus->bustype == SSB_BUSTYPE_SSB)
return ssb_mips_irq(bus->chipco.dev) + 2;
else
return -EINVAL;
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;
......@@ -96,7 +230,9 @@ static int ssb_gpio_chipco_init(struct ssb_bus *bus)
chip->set = ssb_gpio_chipco_set_value;
chip->direction_input = ssb_gpio_chipco_direction_input;
chip->direction_output = ssb_gpio_chipco_direction_output;
chip->to_irq = ssb_gpio_chipco_to_irq;
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
chip->to_irq = ssb_gpio_to_irq;
#endif
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
......@@ -106,9 +242,23 @@ static int ssb_gpio_chipco_init(struct ssb_bus *bus)
else
chip->base = -1;
return gpiochip_add(chip);
err = ssb_gpio_irq_chipco_domain_init(bus);
if (err)
return err;
err = gpiochip_add(chip);
if (err) {
ssb_gpio_irq_chipco_domain_exit(bus);
return err;
}
return 0;
}
/**************************************************
* EXTIF
**************************************************/
#ifdef CONFIG_SSB_DRIVER_EXTIF
static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio)
......@@ -145,19 +295,127 @@ static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
return 0;
}
static int ssb_gpio_extif_to_irq(struct gpio_chip *chip, unsigned gpio)
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static void ssb_gpio_irq_extif_mask(struct irq_data *d)
{
struct ssb_bus *bus = ssb_gpio_get_bus(chip);
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
if (bus->bustype == SSB_BUSTYPE_SSB)
return ssb_mips_irq(bus->extif.dev) + 2;
else
return -EINVAL;
ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
}
static void ssb_gpio_irq_extif_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_extif_gpio_in(&bus->extif, BIT(gpio));
ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
}
static struct irq_chip ssb_gpio_irq_extif_chip = {
.name = "SSB-GPIO-EXTIF",
.irq_mask = ssb_gpio_irq_extif_mask,
.irq_unmask = ssb_gpio_irq_extif_unmask,
};
static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
{
struct ssb_bus *bus = dev_id;
struct ssb_extif *extif = &bus->extif;
u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
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_extif_gpio_polarity(extif, irqs, val & irqs);
return IRQ_HANDLED;
}
static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
{
struct ssb_extif *extif = &bus->extif;
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, extif);
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_extif_chip,
handle_simple_irq);
}
hwirq = ssb_mips_irq(bus->extif.dev) + 2;
err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
"gpio", bus);
if (err)
goto err_req_irq;
ssb_extif_gpio_intmask(&bus->extif, ~0, 0);
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_extif_domain_exit(struct ssb_bus *bus)
{
struct ssb_extif *extif = &bus->extif;
struct gpio_chip *chip = &bus->gpio;
int gpio;
if (bus->bustype != SSB_BUSTYPE_SSB)
return;
free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
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_extif_domain_init(struct ssb_bus *bus)
{
return 0;
}
static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
{
}
#endif
static int ssb_gpio_extif_init(struct ssb_bus *bus)
{
struct gpio_chip *chip = &bus->gpio;
int err;
chip->label = "ssb_extif_gpio";
chip->owner = THIS_MODULE;
......@@ -165,7 +423,9 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus)
chip->set = ssb_gpio_extif_set_value;
chip->direction_input = ssb_gpio_extif_direction_input;
chip->direction_output = ssb_gpio_extif_direction_output;
chip->to_irq = ssb_gpio_extif_to_irq;
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
chip->to_irq = ssb_gpio_to_irq;
#endif
chip->ngpio = 5;
/* 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
......@@ -175,7 +435,17 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus)
else
chip->base = -1;
return gpiochip_add(chip);
err = ssb_gpio_irq_extif_domain_init(bus);
if (err)
return err;
err = gpiochip_add(chip);
if (err) {
ssb_gpio_irq_extif_domain_exit(bus);
return err;
}
return 0;
}
#else
......@@ -185,6 +455,10 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus)
}
#endif
/**************************************************
* Init
**************************************************/
int ssb_gpio_init(struct ssb_bus *bus)
{
if (ssb_chipco_available(&bus->chipco))
......
......@@ -593,6 +593,13 @@ static int ssb_attach_queued_buses(void)
ssb_pcicore_init(&bus->pcicore);
if (bus->bustype == SSB_BUSTYPE_SSB)
ssb_watchdog_register(bus);
err = ssb_gpio_init(bus);
if (err == -ENOTSUPP)
ssb_dbg("GPIO driver not activated\n");
else if (err)
ssb_dbg("Error registering GPIO driver: %i\n", err);
ssb_bus_may_powerdown(bus);
err = ssb_devices_register(bus);
......@@ -830,11 +837,6 @@ static int ssb_bus_register(struct ssb_bus *bus,
ssb_chipcommon_init(&bus->chipco);
ssb_extif_init(&bus->extif);
ssb_mipscore_init(&bus->mipscore);
err = ssb_gpio_init(bus);
if (err == -ENOTSUPP)
ssb_dbg("GPIO driver not activated\n");
else if (err)
ssb_dbg("Error registering GPIO driver: %i\n", err);
err = ssb_fetch_invariants(bus, get_invariants);
if (err) {
ssb_bus_may_powerdown(bus);
......
......@@ -486,6 +486,7 @@ struct ssb_bus {
#endif /* EMBEDDED */
#ifdef CONFIG_SSB_DRIVER_GPIO
struct gpio_chip gpio;
struct irq_domain *irq_domain;
#endif /* DRIVER_GPIO */
/* Internal-only stuff follows. Do not touch. */
......
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