aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm47xx/patches-3.10/100-bcma-gpio-add-own-IRQ-domain.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm47xx/patches-3.10/100-bcma-gpio-add-own-IRQ-domain.patch')
-rw-r--r--target/linux/brcm47xx/patches-3.10/100-bcma-gpio-add-own-IRQ-domain.patch222
1 files changed, 222 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.10/100-bcma-gpio-add-own-IRQ-domain.patch b/target/linux/brcm47xx/patches-3.10/100-bcma-gpio-add-own-IRQ-domain.patch
new file mode 100644
index 0000000000..b6b370dcad
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.10/100-bcma-gpio-add-own-IRQ-domain.patch
@@ -0,0 +1,222 @@
+From 37dc57c2400b2998868a5c103756f36b8dc53a17 Mon Sep 17 00:00:00 2001
+From: Rafa? Mi?ecki <zajec5@gmail.com>
+Date: Thu, 12 Dec 2013 13:46:03 +0100
+Subject: [PATCH 088/110] bcma: gpio: add own IRQ domain
+
+Input GPIO changes can generate interrupts, but we need kind of ACK for
+them by changing IRQ polarity. This is required to stop hardware from
+keep generating interrupts and generate another one on the next GPIO
+state change.
+This code allows using GPIOs with standard interrupts and add for
+example GPIO buttons support.
+
+Signed-off-by: Rafa? Mi?ecki <zajec5@gmail.com>
+Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
+Acked-by: John Crispin <blogic@openwrt.org>
+Patchwork: http://patchwork.linux-mips.org/patch/6216/
+---
+ drivers/bcma/Kconfig | 1 +
+ drivers/bcma/driver_gpio.c | 135 ++++++++++++++++++++++++++-
+ include/linux/bcma/bcma_driver_chipcommon.h | 1 +
+ 3 files changed, 134 insertions(+), 3 deletions(-)
+
+--- a/drivers/bcma/Kconfig
++++ b/drivers/bcma/Kconfig
+@@ -76,6 +76,7 @@ config BCMA_DRIVER_GMAC_CMN
+ config BCMA_DRIVER_GPIO
+ bool "BCMA GPIO driver"
+ depends on BCMA && GPIOLIB
++ select IRQ_DOMAIN if BCMA_HOST_SOC
+ help
+ Driver to provide access to the GPIO pins of the bcma bus.
+
+--- a/drivers/bcma/driver_gpio.c
++++ b/drivers/bcma/driver_gpio.c
+@@ -9,6 +9,9 @@
+ */
+
+ #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>
+
+@@ -73,19 +76,133 @@ static void bcma_gpio_free(struct gpio_c
+ 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 bcma_core_irq(cc->core);
++ 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);
++
++ 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);
++ u32 irqs = (val ^ pol) & mask;
++ int gpio;
++
++ if (!irqs)
++ return IRQ_NONE;
++
++ for_each_set_bit(gpio, (unsigned long *)&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_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;
+@@ -95,7 +212,8 @@ int bcma_gpio_init(struct bcma_drv_cc *c
+ chip->set = bcma_gpio_set_value;
+ chip->direction_input = bcma_gpio_direction_input;
+ chip->direction_output = bcma_gpio_direction_output;
+- chip->to_irq = bcma_gpio_to_irq;
++ if (IS_BUILTIN(CONFIG_BCMA_HOST_SOC))
++ chip->to_irq = bcma_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
+@@ -105,10 +223,21 @@ int bcma_gpio_init(struct bcma_drv_cc *c
+ else
+ chip->base = -1;
+
+- return gpiochip_add(chip);
++ 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);
+ }
+--- a/include/linux/bcma/bcma_driver_chipcommon.h
++++ b/include/linux/bcma/bcma_driver_chipcommon.h
+@@ -640,6 +640,7 @@ struct bcma_drv_cc {
+ spinlock_t gpio_lock;
+ #ifdef CONFIG_BCMA_DRIVER_GPIO
+ struct gpio_chip gpio;
++ struct irq_domain *irq_domain;
+ #endif
+ };
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-07 08:06:00 +0000