/* * Sonics Silicon Backplane * GPIO driver * * Copyright 2011, Broadcom Corporation * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de> * * Licensed under the GNU/GPL. See COPYING for details. */ #include "ssb_private.h" #include <linux/gpio/driver.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/irqdomain.h> #include <linux/export.h> #include <linux/ssb/ssb.h> /************************************************** * Shared **************************************************/ #if IS_ENABLED(CONFIG_SSB_EMBEDDED) static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned int gpio) { struct ssb_bus *bus = gpiochip_get_data(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 int gpio) { struct ssb_bus *bus = gpiochip_get_data(chip); return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio); } static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned int gpio, int value) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); } static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip, unsigned int gpio) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0); return 0; } static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip, unsigned int gpio, int value) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio); ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); return 0; } static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned int gpio) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0); /* clear pulldown */ ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0); /* Set pullup */ ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio); return 0; } static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned int gpio) { struct ssb_bus *bus = gpiochip_get_data(chip); /* clear pullup */ ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0); } #if IS_ENABLED(CONFIG_SSB_EMBEDDED) static void ssb_gpio_irq_chipco_mask(struct irq_data *d) { struct ssb_bus *bus = irq_data_get_irq_chip_data(d); int gpio = irqd_to_hwirq(d); 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; chip->request = ssb_gpio_chipco_request; chip->free = ssb_gpio_chipco_free; chip->get = ssb_gpio_chipco_get_value; chip->set = ssb_gpio_chipco_set_value; chip->direction_input = ssb_gpio_chipco_direction_input; chip->direction_output = ssb_gpio_chipco_direction_output; #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 * a random base number. */ if (bus->bustype == SSB_BUSTYPE_SSB) chip->base = 0; else chip->base = -1; err = ssb_gpio_irq_chipco_domain_init(bus); if (err) return err; err = gpiochip_add_data(chip, bus); 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 int gpio) { struct ssb_bus *bus = gpiochip_get_data(chip); return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio); } static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned int gpio, int value) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); } static int ssb_gpio_extif_direction_input(struct gpio_chip *chip, unsigned int gpio) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0); return 0; } static int ssb_gpio_extif_direction_output(struct gpio_chip *chip, unsigned int gpio, int value) { struct ssb_bus *bus = gpiochip_get_data(chip); ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio); ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); return 0; } #if IS_ENABLED(CONFIG_SSB_EMBEDDED) static void ssb_gpio_irq_extif_mask(struct irq_data *d) { struct ssb_bus *bus = irq_data_get_irq_chip_data(d); int gpio = irqd_to_hwirq(d); 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; chip->get = ssb_gpio_extif_get_value; chip->set = ssb_gpio_extif_set_value; chip->direction_input = ssb_gpio_extif_direction_input; chip->direction_output = ssb_gpio_extif_direction_output; #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 * a random base number. */ if (bus->bustype == SSB_BUSTYPE_SSB) chip->base = 0; else chip->base = -1; err = ssb_gpio_irq_extif_domain_init(bus); if (err) return err; err = gpiochip_add_data(chip, bus); if (err) { ssb_gpio_irq_extif_domain_exit(bus); return err; } return 0; } #else static int ssb_gpio_extif_init(struct ssb_bus *bus) { return -ENOTSUPP; } #endif /************************************************** * Init **************************************************/ int ssb_gpio_init(struct ssb_bus *bus) { if (ssb_chipco_available(&bus->chipco)) return ssb_gpio_chipco_init(bus); else if (ssb_extif_available(&bus->extif)) return ssb_gpio_extif_init(bus); return -1; } int ssb_gpio_unregister(struct ssb_bus *bus) { if (ssb_chipco_available(&bus->chipco) || ssb_extif_available(&bus->extif)) { gpiochip_remove(&bus->gpio); return 0; } return -1; }