[PATCH 3/3] gpio: msm: Add device tree and irqdomain support for gpio-msm-v2
From: Rohit Vaswani
Date: Mon Jun 10 2013 - 18:50:45 EST
This cleans up the gpio-msm-v2 driver of all the global define usage.
The number of gpios are now defined in the device tree. This enables
adding irqdomain support as well.
Signed-off-by: Rohit Vaswani <rvaswani@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/gpio/gpio-msm.txt | 26 +++
arch/arm/boot/dts/msm8660-surf.dts | 11 ++
arch/arm/boot/dts/msm8960-cdp.dts | 11 ++
drivers/gpio/Kconfig | 2 +-
drivers/gpio/gpio-msm-v2.c | 190 ++++++++++++--------
5 files changed, 162 insertions(+), 78 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-msm.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-msm.txt b/Documentation/devicetree/bindings/gpio/gpio-msm.txt
new file mode 100644
index 0000000..ac20e68
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-msm.txt
@@ -0,0 +1,26 @@
+MSM GPIO controller bindings
+
+Required properties:
+- compatible:
+ - "qcom,msm-gpio" for MSM controllers
+- #gpio-cells : Should be two.
+ - first cell is the pin number
+ - second cell is used to specify optional parameters (unused)
+- gpio-controller : Marks the device node as a GPIO controller.
+- #interrupt-cells : Should be 2.
+- interrupt-controller: Mark the device node as an interrupt controller
+- interrupts : Specify the TLMM summary interrupt number
+- ngpio : Specify the number of MSM GPIOs
+
+Example:
+
+ msmgpio: gpio@fd510000 {
+ compatible = "qcom,msm-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ reg = <0xfd510000 0x4000>;
+ interrupts = <0 208 0>;
+ ngpio = <150>;
+ };
diff --git a/arch/arm/boot/dts/msm8660-surf.dts b/arch/arm/boot/dts/msm8660-surf.dts
index 9bf49b3..8931906 100644
--- a/arch/arm/boot/dts/msm8660-surf.dts
+++ b/arch/arm/boot/dts/msm8660-surf.dts
@@ -26,6 +26,17 @@
cpu-offset = <0x40000>;
};
+ msmgpio: gpio@800000 {
+ compatible = "qcom,msm-gpio";
+ reg = <0x00800000 0x1000>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ ngpio = <173>;
+ interrupts = <0 32 0x4>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
+
serial@19c400000 {
compatible = "qcom,msm-hsuart", "qcom,msm-uart";
reg = <0x19c40000 0x1000>,
diff --git a/arch/arm/boot/dts/msm8960-cdp.dts b/arch/arm/boot/dts/msm8960-cdp.dts
index 2e4d87a..52fe253 100644
--- a/arch/arm/boot/dts/msm8960-cdp.dts
+++ b/arch/arm/boot/dts/msm8960-cdp.dts
@@ -26,6 +26,17 @@
cpu-offset = <0x80000>;
};
+ msmgpio: gpio@fd510000 {
+ compatible = "qcom,msm-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ ngpio = <150>;
+ interrupts = <0 32 0x4>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ reg = <0xfd510000 0x4000>;
+ };
+
serial@19c400000 {
compatible = "qcom,msm-hsuart", "qcom,msm-uart";
reg = <0x16440000 0x1000>,
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 87d5670..6d61a12 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -165,7 +165,7 @@ config GPIO_MSM_V1
config GPIO_MSM_V2
tristate "Qualcomm MSM GPIO v2"
- depends on GPIOLIB && ARCH_MSM
+ depends on GPIOLIB && OF && ARCH_MSM
help
Say yes here to support the GPIO interface on ARM v7 based
Qualcomm MSM chips. Most of the pins on the MSM can be
diff --git a/drivers/gpio/gpio-msm-v2.c b/drivers/gpio/gpio-msm-v2.c
index 75cc821..f4491a4 100644
--- a/drivers/gpio/gpio-msm-v2.c
+++ b/drivers/gpio/gpio-msm-v2.c
@@ -19,17 +19,21 @@
#include <linux/bitmap.h>
#include <linux/bitops.h>
+#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/module.h>
+#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
+#include <linux/slab.h>
-#include <mach/msm_iomap.h>
+#define MAX_NR_GPIO 300
/* Bits of interest in the GPIO_IN_OUT register.
*/
@@ -76,13 +80,6 @@ enum {
TARGET_PROC_NONE = 7,
};
-
-#define GPIO_INTR_CFG_SU(gpio) (MSM_TLMM_BASE + 0x0400 + (0x04 * (gpio)))
-#define GPIO_CONFIG(gpio) (MSM_TLMM_BASE + 0x1000 + (0x10 * (gpio)))
-#define GPIO_IN_OUT(gpio) (MSM_TLMM_BASE + 0x1004 + (0x10 * (gpio)))
-#define GPIO_INTR_CFG(gpio) (MSM_TLMM_BASE + 0x1008 + (0x10 * (gpio)))
-#define GPIO_INTR_STATUS(gpio) (MSM_TLMM_BASE + 0x100c + (0x10 * (gpio)))
-
/**
* struct msm_gpio_dev: the MSM8660 SoC GPIO device structure
*
@@ -101,11 +98,27 @@ enum {
*/
struct msm_gpio_dev {
struct gpio_chip gpio_chip;
- DECLARE_BITMAP(enabled_irqs, NR_GPIO_IRQS);
- DECLARE_BITMAP(wake_irqs, NR_GPIO_IRQS);
- DECLARE_BITMAP(dual_edge_irqs, NR_GPIO_IRQS);
+ DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);
+ DECLARE_BITMAP(wake_irqs, MAX_NR_GPIO);
+ DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
+ struct irq_domain *domain;
+ unsigned int summary_irq;
+ void __iomem *msm_tlmm_base;
};
+struct msm_gpio_dev msm_gpio;
+
+#define GPIO_INTR_CFG_SU(gpio) (msm_gpio.msm_tlmm_base + 0x0400 + \
+ (0x04 * (gpio)))
+#define GPIO_CONFIG(gpio) (msm_gpio.msm_tlmm_base + 0x1000 + \
+ (0x10 * (gpio)))
+#define GPIO_IN_OUT(gpio) (msm_gpio.msm_tlmm_base + 0x1004 + \
+ (0x10 * (gpio)))
+#define GPIO_INTR_CFG(gpio) (msm_gpio.msm_tlmm_base + 0x1008 + \
+ (0x10 * (gpio)))
+#define GPIO_INTR_STATUS(gpio) (msm_gpio.msm_tlmm_base + 0x100c + \
+ (0x10 * (gpio)))
+
static DEFINE_SPINLOCK(tlmm_lock);
static inline struct msm_gpio_dev *to_msm_gpio_dev(struct gpio_chip *chip)
@@ -168,27 +181,19 @@ static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
- return MSM_GPIO_TO_INT(chip->base + offset);
+ struct msm_gpio_dev *g_dev = to_msm_gpio_dev(chip);
+ struct irq_domain *domain = g_dev->domain;
+
+ return irq_create_mapping(domain, offset);
}
static inline int msm_irq_to_gpio(struct gpio_chip *chip, unsigned irq)
{
- return irq - MSM_GPIO_TO_INT(chip->base);
+ struct irq_data *irq_data = irq_get_irq_data(irq);
+
+ return irq_data->hwirq;
}
-static struct msm_gpio_dev msm_gpio = {
- .gpio_chip = {
- .base = 0,
- .ngpio = NR_GPIO_IRQS,
- .direction_input = msm_gpio_direction_input,
- .direction_output = msm_gpio_direction_output,
- .get = msm_gpio_get,
- .set = msm_gpio_set,
- .to_irq = msm_gpio_to_irq,
- .request = msm_gpio_request,
- .free = msm_gpio_free,
- },
-};
/* For dual-edge interrupts in software, since the hardware has no
* such support:
@@ -226,9 +231,9 @@ static void msm_gpio_update_dual_edge_pos(unsigned gpio)
if (intstat || val == val2)
return;
} while (loop_limit-- > 0);
- pr_err("dual-edge irq failed to stabilize, "
+ pr_err("%s: dual-edge irq failed to stabilize, "
"interrupts dropped. %#08x != %#08x\n",
- val, val2);
+ __func__, val, val2);
}
static void msm_gpio_irq_ack(struct irq_data *d)
@@ -315,10 +320,10 @@ static void msm_summary_irq_handler(unsigned int irq, struct irq_desc *desc)
chained_irq_enter(chip, desc);
- for_each_set_bit(i, msm_gpio.enabled_irqs, NR_GPIO_IRQS) {
+ for_each_set_bit(i, msm_gpio.enabled_irqs, MAX_NR_GPIO) {
if (readl(GPIO_INTR_STATUS(i)) & BIT(INTR_STATUS))
- generic_handle_irq(msm_gpio_to_irq(&msm_gpio.gpio_chip,
- i));
+ generic_handle_irq(irq_find_mapping(msm_gpio.domain,
+ i));
}
chained_irq_exit(chip, desc);
@@ -329,13 +334,13 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
int gpio = msm_irq_to_gpio(&msm_gpio.gpio_chip, d->irq);
if (on) {
- if (bitmap_empty(msm_gpio.wake_irqs, NR_GPIO_IRQS))
- irq_set_irq_wake(TLMM_SCSS_SUMMARY_IRQ, 1);
+ if (bitmap_empty(msm_gpio.wake_irqs, MAX_NR_GPIO))
+ irq_set_irq_wake(msm_gpio.summary_irq, 1);
set_bit(gpio, msm_gpio.wake_irqs);
} else {
clear_bit(gpio, msm_gpio.wake_irqs);
- if (bitmap_empty(msm_gpio.wake_irqs, NR_GPIO_IRQS))
- irq_set_irq_wake(TLMM_SCSS_SUMMARY_IRQ, 0);
+ if (bitmap_empty(msm_gpio.wake_irqs, MAX_NR_GPIO))
+ irq_set_irq_wake(msm_gpio.summary_irq, 0);
}
return 0;
@@ -350,30 +355,86 @@ static struct irq_chip msm_gpio_irq_chip = {
.irq_set_wake = msm_gpio_irq_set_wake,
};
-static int msm_gpio_probe(struct platform_device *dev)
+static struct lock_class_key msm_gpio_lock_class;
+
+static int msm_gpio_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_lockdep_class(irq, &msm_gpio_lock_class);
+ irq_set_chip_and_handler(irq, &msm_gpio_irq_chip,
+ handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID);
+
+ return 0;
+}
+
+static const struct irq_domain_ops msm_gpio_irq_domain_ops = {
+ .xlate = irq_domain_xlate_twocell,
+ .map = msm_gpio_irq_domain_map,
+};
+
+static int msm_gpio_probe(struct platform_device *pdev)
{
- int i, irq, ret;
+ int ret, ngpio;
+ struct resource *res;
+
+ if (!of_property_read_u32(pdev->dev.of_node, "ngpio", &ngpio)) {
+ dev_err(&pdev->dev, "%s: ngpio property missing\n", __func__);
+ return -EINVAL;
+ }
+
+ if (ngpio > MAX_NR_GPIO)
+ WARN(1, "ngpio exceeds the MAX_NR_GPIO. Increase MAX_NR_GPIO\n");
+
+ bitmap_zero(msm_gpio.enabled_irqs, MAX_NR_GPIO);
+ bitmap_zero(msm_gpio.wake_irqs, MAX_NR_GPIO);
+ bitmap_zero(msm_gpio.dual_edge_irqs, MAX_NR_GPIO);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ msm_gpio.msm_tlmm_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(msm_gpio.msm_tlmm_base))
+ return PTR_ERR(msm_gpio.msm_tlmm_base);
+
+ msm_gpio.gpio_chip.ngpio = ngpio;
+ msm_gpio.gpio_chip.label = pdev->name;
+ msm_gpio.gpio_chip.dev = &pdev->dev;
+ msm_gpio.gpio_chip.base = 0;
+ msm_gpio.gpio_chip.direction_input = msm_gpio_direction_input;
+ msm_gpio.gpio_chip.direction_output = msm_gpio_direction_output;
+ msm_gpio.gpio_chip.get = msm_gpio_get;
+ msm_gpio.gpio_chip.set = msm_gpio_set;
+ msm_gpio.gpio_chip.to_irq = msm_gpio_to_irq;
+ msm_gpio.gpio_chip.request = msm_gpio_request;
+ msm_gpio.gpio_chip.free = msm_gpio_free;
- bitmap_zero(msm_gpio.enabled_irqs, NR_GPIO_IRQS);
- bitmap_zero(msm_gpio.wake_irqs, NR_GPIO_IRQS);
- bitmap_zero(msm_gpio.dual_edge_irqs, NR_GPIO_IRQS);
- msm_gpio.gpio_chip.label = dev->name;
ret = gpiochip_add(&msm_gpio.gpio_chip);
- if (ret < 0)
+ if (ret < 0) {
+ dev_err(&pdev->dev, "gpiochip_add failed with error %d\n", ret);
return ret;
+ }
- for (i = 0; i < msm_gpio.gpio_chip.ngpio; ++i) {
- irq = msm_gpio_to_irq(&msm_gpio.gpio_chip, i);
- irq_set_chip_and_handler(irq, &msm_gpio_irq_chip,
- handle_level_irq);
- set_irq_flags(irq, IRQF_VALID);
+ msm_gpio.summary_irq = platform_get_irq(pdev, 0);
+ if (msm_gpio.summary_irq < 0) {
+ dev_err(&pdev->dev, "No Summary irq defined for msmgpio\n");
+ return msm_gpio.summary_irq;
}
- irq_set_chained_handler(TLMM_SCSS_SUMMARY_IRQ,
- msm_summary_irq_handler);
+ msm_gpio.domain = irq_domain_add_linear(pdev->dev.of_node, ngpio,
+ &msm_gpio_irq_domain_ops,
+ &msm_gpio);
+ if (!msm_gpio.domain)
+ return -ENODEV;
+
+ irq_set_chained_handler(msm_gpio.summary_irq, msm_summary_irq_handler);
+
return 0;
}
+static struct of_device_id msm_gpio_of_match[] = {
+ { .compatible = "qcom,msm-gpio", },
+ { },
+};
+
static int msm_gpio_remove(struct platform_device *dev)
{
int ret = gpiochip_remove(&msm_gpio.gpio_chip);
@@ -381,7 +442,7 @@ static int msm_gpio_remove(struct platform_device *dev)
if (ret < 0)
return ret;
- irq_set_handler(TLMM_SCSS_SUMMARY_IRQ, NULL);
+ irq_set_handler(msm_gpio.summary_irq, NULL);
return 0;
}
@@ -392,36 +453,11 @@ static struct platform_driver msm_gpio_driver = {
.driver = {
.name = "msmgpio",
.owner = THIS_MODULE,
+ .of_match_table = msm_gpio_of_match,
},
};
-static struct platform_device msm_device_gpio = {
- .name = "msmgpio",
- .id = -1,
-};
-
-static int __init msm_gpio_init(void)
-{
- int rc;
-
- rc = platform_driver_register(&msm_gpio_driver);
- if (!rc) {
- rc = platform_device_register(&msm_device_gpio);
- if (rc)
- platform_driver_unregister(&msm_gpio_driver);
- }
-
- return rc;
-}
-
-static void __exit msm_gpio_exit(void)
-{
- platform_device_unregister(&msm_device_gpio);
- platform_driver_unregister(&msm_gpio_driver);
-}
-
-postcore_initcall(msm_gpio_init);
-module_exit(msm_gpio_exit);
+module_platform_driver(msm_gpio_driver)
MODULE_AUTHOR("Gregory Bean <gbean@xxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs");
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
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