LoCoMo has a possibility to generate per-GPIO edge irqs. Support for that was there in old locomo driver, got 'cleaned up' during old driver IRQ cascading cleanup and is now reimplemented. It is expected that SL-5500 (collie) will use locomo gpio irqs for mmc detection irq.
Signed-off-by: Dmitry Eremin-Solenikov dbaryshkov@gmail.com Reviewed-by: Linus Walleij linus.walleij@linaro.org --- drivers/gpio/Kconfig | 1 + drivers/gpio/gpio-locomo.c | 117 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 117 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 4542684..6b77614 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -737,6 +737,7 @@ config GPIO_KEMPLD config GPIO_LOCOMO bool "Sharp LoCoMo GPIO support" depends on MFD_LOCOMO + select GPIOLIB_IRQCHIP help Select this to support GPIO pins on Sharp LoCoMo Grid Array found in Sharp Zaurus collie and poodle models. diff --git a/drivers/gpio/gpio-locomo.c b/drivers/gpio/gpio-locomo.c index dd9a1ca..75dbf6b 100644 --- a/drivers/gpio/gpio-locomo.c +++ b/drivers/gpio/gpio-locomo.c @@ -16,13 +16,15 @@ #include <linux/slab.h> #include <linux/bitops.h> #include <linux/err.h> -#include <linux/gpio.h> +#include <linux/gpio/driver.h> #include <linux/io.h> +#include <linux/irq.h> #include <linux/regmap.h> #include <linux/mfd/locomo.h>
struct locomo_gpio { struct regmap *regmap; + int irq;
struct gpio_chip gpio;
@@ -79,6 +81,99 @@ static int locomo_gpio_direction_output(struct gpio_chip *chip, return 0; }
+static void +locomo_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + struct gpio_chip *chip = irq_get_handler_data(irq); + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + struct irq_chip *irqchip = irq_desc_get_chip(desc); + unsigned int gir; + unsigned int gpd; + unsigned int req; + + chained_irq_enter(irqchip, desc); + + while (1) { + regmap_read(lg->regmap, LOCOMO_GIR, &gir); + regmap_read(lg->regmap, LOCOMO_GPD, &gpd); + req = gir & gpd; + + if (!req) + break; + + generic_handle_irq(irq_find_mapping(lg->gpio.irqdomain, + ffs(req) - 1)); + } + + chained_irq_exit(irqchip, desc); +} + +static void locomo_gpio_ack_irq(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + unsigned int mask = BIT(d->hwirq); + + regmap_update_bits(lg->regmap, LOCOMO_GWE, mask, mask); + regmap_update_bits(lg->regmap, LOCOMO_GIS, mask, 0); + regmap_update_bits(lg->regmap, LOCOMO_GWE, mask, 0); +} + +static void locomo_gpio_mask_irq(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + unsigned int mask = BIT(d->hwirq); + + regmap_update_bits(lg->regmap, LOCOMO_GIE, mask, 0); +} + +static void locomo_gpio_unmask_irq(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + unsigned int mask = BIT(d->hwirq); + + regmap_update_bits(lg->regmap, LOCOMO_GIE, mask, mask); +} + +static int locomo_gpio_type_irq(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct locomo_gpio *lg = container_of(chip, struct locomo_gpio, gpio); + unsigned int mask; + + mask = BIT(d->hwirq); + + if (type == IRQ_TYPE_PROBE) { + if ((lg->rising_edge | lg->falling_edge) & mask) + return 0; + type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; + } + + if (type & IRQ_TYPE_EDGE_RISING) + lg->rising_edge |= mask; + else + lg->rising_edge &= ~mask; + if (type & IRQ_TYPE_EDGE_FALLING) + lg->falling_edge |= mask; + else + lg->falling_edge &= ~mask; + + regmap_write(lg->regmap, LOCOMO_GRIE, lg->rising_edge); + regmap_write(lg->regmap, LOCOMO_GFIE, lg->falling_edge); + + return 0; +} + +static struct irq_chip locomo_gpio_irq_chip = { + .name = "locomo-GPIO", + .irq_ack = locomo_gpio_ack_irq, + .irq_mask = locomo_gpio_mask_irq, + .irq_unmask = locomo_gpio_unmask_irq, + .irq_set_type = locomo_gpio_type_irq, +}; + #ifdef CONFIG_PM_SLEEP static int locomo_gpio_suspend(struct device *dev) { @@ -119,6 +214,10 @@ static int locomo_gpio_probe(struct platform_device *pdev) if (!lg) return -ENOMEM;
+ lg->irq = platform_get_irq(pdev, 0); + if (lg->irq < 0) + return -ENXIO; + lg->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!lg->regmap) return -EINVAL; @@ -130,6 +229,7 @@ static int locomo_gpio_probe(struct platform_device *pdev) regmap_write(lg->regmap, LOCOMO_GPD, 0x00); regmap_write(lg->regmap, LOCOMO_GIE, 0x00);
+ lg->gpio.dev = &pdev->dev; lg->gpio.base = pdata ? pdata->gpio_base : -1; lg->gpio.label = "locomo-gpio"; lg->gpio.ngpio = 16; @@ -142,7 +242,22 @@ static int locomo_gpio_probe(struct platform_device *pdev) if (ret) return ret;
+ ret = gpiochip_irqchip_add(&lg->gpio, &locomo_gpio_irq_chip, 0, + handle_level_irq, IRQ_TYPE_NONE); + if (ret) { + dev_err(&pdev->dev, "Failed to add irq chip\n"); + goto err_rm_gpiochip; + } + + gpiochip_set_chained_irqchip(&lg->gpio, &locomo_gpio_irq_chip, lg->irq, + locomo_gpio_irq_handler); + return 0; + +err_rm_gpiochip: + gpiochip_remove(&lg->gpio); + + return ret; }
static int locomo_gpio_remove(struct platform_device *pdev)