diff options
author | Rohit Vaswani <rvaswani@codeaurora.org> | 2013-06-10 15:50:21 -0700 |
---|---|---|
committer | David Brown <davidb@codeaurora.org> | 2013-06-12 14:50:12 -0700 |
commit | 43f68444bce70e360ff6ce3653a54e511625f651 (patch) | |
tree | 31a695accad61e88f5f584acca4d9abc0d708eea /drivers/gpio/gpio-msm-v2.c | |
parent | eda9dcfa56f4864e0e4340f5af3f3e39f514b726 (diff) | |
download | linux-43f68444bce70e360ff6ce3653a54e511625f651.tar.bz2 |
gpio: msm: Add device tree and irqdomain support for gpio-msm-v2
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@codeaurora.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
Diffstat (limited to 'drivers/gpio/gpio-msm-v2.c')
-rw-r--r-- | drivers/gpio/gpio-msm-v2.c | 190 |
1 files changed, 113 insertions, 77 deletions
diff --git a/drivers/gpio/gpio-msm-v2.c b/drivers/gpio/gpio-msm-v2.c index 75cc8215f15b..f4491a497cc8 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@codeaurora.org>"); MODULE_DESCRIPTION("Driver for Qualcomm MSM TLMMv2 SoC GPIOs"); |