diff options
Diffstat (limited to 'drivers/ssb/driver_gpio.c')
| -rw-r--r-- | drivers/ssb/driver_gpio.c | 306 |
1 files changed, 290 insertions, 16 deletions
diff --git a/drivers/ssb/driver_gpio.c b/drivers/ssb/driver_gpio.c index dc109de228c..ba350d2035c 100644 --- 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_ENABLED(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 gpio_chip *chip, unsigned gpio) ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0); } -static int ssb_gpio_chipco_to_irq(struct gpio_chip *chip, unsigned gpio) +#if IS_ENABLED(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); + unsigned long irqs = (val ^ pol) & mask; + int gpio; + + if (!irqs) + return IRQ_NONE; + + for_each_set_bit(gpio, &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 +230,9 @@ static int ssb_gpio_chipco_init(struct ssb_bus *bus) 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_ENABLED(CONFIG_SSB_EMBEDDED) + chip->to_irq = ssb_gpio_to_irq; +#endif 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 +242,23 @@ static int ssb_gpio_chipco_init(struct ssb_bus *bus) 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 +295,127 @@ static int ssb_gpio_extif_direction_output(struct gpio_chip *chip, return 0; } -static int ssb_gpio_extif_to_irq(struct gpio_chip *chip, unsigned gpio) +#if IS_ENABLED(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); + unsigned long irqs = (val ^ pol) & mask; + int gpio; + + if (!irqs) + return IRQ_NONE; + + for_each_set_bit(gpio, &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 +423,9 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus) 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_ENABLED(CONFIG_SSB_EMBEDDED) + chip->to_irq = ssb_gpio_to_irq; +#endif 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 +435,17 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus) 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 +455,10 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus) } #endif +/************************************************** + * Init + **************************************************/ + int ssb_gpio_init(struct ssb_bus *bus) { if (ssb_chipco_available(&bus->chipco)) |