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openwrt/target/linux/brcm47xx/patches-3.10/102-ssb-gpio-add-own-IRQ-domain.patch
Hauke Mehrtens c2992ee273 brcm47xx: add new led and button support 
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 39252
2014-01-12 18:55:25 +00:00

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12 KiB
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From 5668cb19fea423cb6681f1efa8b130a26be2562e Mon Sep 17 00:00:00 2001
From: Rafa? Mi?ecki <zajec5@gmail.com>
Date: Fri, 3 Jan 2014 09:55:29 +0100
Subject: [PATCH] ssb: gpio: add own IRQ domain
Signed-off-by: Rafa? Mi?ecki <zajec5@gmail.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
---
drivers/ssb/Kconfig | 1 +
drivers/ssb/driver_gpio.c | 304 ++++++++++++++++++++++++++++++++++++++++++---
drivers/ssb/main.c | 12 +-
include/linux/ssb/ssb.h | 1 +
4 files changed, 297 insertions(+), 21 deletions(-)
--- a/drivers/ssb/Kconfig
+++ b/drivers/ssb/Kconfig
@@ -169,6 +169,7 @@ 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.
--- a/drivers/ssb/driver_gpio.c
+++ b/drivers/ssb/driver_gpio.c
@@ -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_BUILTIN(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
ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
}
-static int ssb_gpio_chipco_to_irq(struct gpio_chip *chip, unsigned gpio)
+#if IS_BUILTIN(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);
+ u32 irqs = (val ^ pol) & mask;
+ int gpio;
+
+ if (!irqs)
+ return IRQ_NONE;
+
+ for_each_set_bit(gpio, (unsigned long *)&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 +230,8 @@ static int ssb_gpio_chipco_init(struct s
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_BUILTIN(CONFIG_SSB_EMBEDDED))
+ chip->to_irq = ssb_gpio_to_irq;
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 +241,23 @@ static int ssb_gpio_chipco_init(struct s
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 +294,127 @@ static int ssb_gpio_extif_direction_outp
return 0;
}
-static int ssb_gpio_extif_to_irq(struct gpio_chip *chip, unsigned gpio)
+#if IS_BUILTIN(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);
+ u32 irqs = (val ^ pol) & mask;
+ int gpio;
+
+ if (!irqs)
+ return IRQ_NONE;
+
+ for_each_set_bit(gpio, (unsigned long *)&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 +422,8 @@ static int ssb_gpio_extif_init(struct ss
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_BUILTIN(CONFIG_SSB_EMBEDDED))
+ chip->to_irq = ssb_gpio_to_irq;
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 +433,17 @@ static int ssb_gpio_extif_init(struct ss
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 +453,10 @@ static int ssb_gpio_extif_init(struct ss
}
#endif
+/**************************************************
+ * Init
+ **************************************************/
+
int ssb_gpio_init(struct ssb_bus *bus)
{
if (ssb_chipco_available(&bus->chipco))
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -590,6 +590,13 @@ 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);
@@ -827,11 +834,6 @@ static int ssb_bus_register(struct ssb_b
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);
--- a/include/linux/ssb/ssb.h
+++ b/include/linux/ssb/ssb.h
@@ -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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