| /* |
| * Broadcom specific AMBA |
| * GPIO driver |
| * |
| * Copyright 2011, Broadcom Corporation |
| * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de> |
| * |
| * Licensed under the GNU/GPL. See COPYING for details. |
| */ |
| |
| #include <linux/gpio/driver.h> |
| #include <linux/interrupt.h> |
| #include <linux/export.h> |
| #include <linux/property.h> |
| |
| #include <linux/bcma/bcma.h> |
| |
| #include "bcma_private.h" |
| |
| #define BCMA_GPIO_MAX_PINS 32 |
| |
| static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcma_drv_cc *cc = gpiochip_get_data(chip); |
| |
| return !!bcma_chipco_gpio_in(cc, 1 << gpio); |
| } |
| |
| static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio, |
| int value) |
| { |
| struct bcma_drv_cc *cc = gpiochip_get_data(chip); |
| |
| bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); |
| } |
| |
| static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcma_drv_cc *cc = gpiochip_get_data(chip); |
| |
| bcma_chipco_gpio_outen(cc, 1 << gpio, 0); |
| return 0; |
| } |
| |
| static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, |
| int value) |
| { |
| struct bcma_drv_cc *cc = gpiochip_get_data(chip); |
| |
| bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio); |
| bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); |
| return 0; |
| } |
| |
| static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcma_drv_cc *cc = gpiochip_get_data(chip); |
| |
| bcma_chipco_gpio_control(cc, 1 << gpio, 0); |
| /* clear pulldown */ |
| bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0); |
| /* Set pullup */ |
| bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio); |
| |
| return 0; |
| } |
| |
| static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcma_drv_cc *cc = gpiochip_get_data(chip); |
| |
| /* clear pullup */ |
| bcma_chipco_gpio_pullup(cc, 1 << gpio, 0); |
| } |
| |
| #if IS_BUILTIN(CONFIG_BCM47XX) || IS_BUILTIN(CONFIG_ARCH_BCM_5301X) |
| |
| static void bcma_gpio_irq_unmask(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| struct bcma_drv_cc *cc = gpiochip_get_data(gc); |
| int gpio = irqd_to_hwirq(d); |
| u32 val = bcma_chipco_gpio_in(cc, BIT(gpio)); |
| |
| bcma_chipco_gpio_polarity(cc, BIT(gpio), val); |
| bcma_chipco_gpio_intmask(cc, BIT(gpio), BIT(gpio)); |
| } |
| |
| static void bcma_gpio_irq_mask(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| struct bcma_drv_cc *cc = gpiochip_get_data(gc); |
| int gpio = irqd_to_hwirq(d); |
| |
| bcma_chipco_gpio_intmask(cc, BIT(gpio), 0); |
| } |
| |
| static struct irq_chip bcma_gpio_irq_chip = { |
| .name = "BCMA-GPIO", |
| .irq_mask = bcma_gpio_irq_mask, |
| .irq_unmask = bcma_gpio_irq_unmask, |
| }; |
| |
| static irqreturn_t bcma_gpio_irq_handler(int irq, void *dev_id) |
| { |
| struct bcma_drv_cc *cc = dev_id; |
| struct gpio_chip *gc = &cc->gpio; |
| u32 val = bcma_cc_read32(cc, BCMA_CC_GPIOIN); |
| u32 mask = bcma_cc_read32(cc, BCMA_CC_GPIOIRQ); |
| u32 pol = bcma_cc_read32(cc, BCMA_CC_GPIOPOL); |
| unsigned long irqs = (val ^ pol) & mask; |
| int gpio; |
| |
| if (!irqs) |
| return IRQ_NONE; |
| |
| for_each_set_bit(gpio, &irqs, gc->ngpio) |
| generic_handle_domain_irq_safe(gc->irq.domain, gpio); |
| bcma_chipco_gpio_polarity(cc, irqs, val & irqs); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int bcma_gpio_irq_init(struct bcma_drv_cc *cc) |
| { |
| struct gpio_chip *chip = &cc->gpio; |
| struct gpio_irq_chip *girq = &chip->irq; |
| int hwirq, err; |
| |
| if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC) |
| return 0; |
| |
| hwirq = bcma_core_irq(cc->core, 0); |
| err = request_irq(hwirq, bcma_gpio_irq_handler, IRQF_SHARED, "gpio", |
| cc); |
| if (err) |
| return err; |
| |
| bcma_chipco_gpio_intmask(cc, ~0, 0); |
| bcma_cc_set32(cc, BCMA_CC_IRQMASK, BCMA_CC_IRQ_GPIO); |
| |
| girq->chip = &bcma_gpio_irq_chip; |
| /* This will let us handle the parent IRQ in the driver */ |
| girq->parent_handler = NULL; |
| girq->num_parents = 0; |
| girq->parents = NULL; |
| girq->default_type = IRQ_TYPE_NONE; |
| girq->handler = handle_simple_irq; |
| |
| return 0; |
| } |
| |
| static void bcma_gpio_irq_exit(struct bcma_drv_cc *cc) |
| { |
| if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC) |
| return; |
| |
| bcma_cc_mask32(cc, BCMA_CC_IRQMASK, ~BCMA_CC_IRQ_GPIO); |
| free_irq(bcma_core_irq(cc->core, 0), cc); |
| } |
| #else |
| static int bcma_gpio_irq_init(struct bcma_drv_cc *cc) |
| { |
| return 0; |
| } |
| |
| static void bcma_gpio_irq_exit(struct bcma_drv_cc *cc) |
| { |
| } |
| #endif |
| |
| int bcma_gpio_init(struct bcma_drv_cc *cc) |
| { |
| struct bcma_bus *bus = cc->core->bus; |
| struct gpio_chip *chip = &cc->gpio; |
| int err; |
| |
| chip->label = "bcma_gpio"; |
| chip->owner = THIS_MODULE; |
| chip->request = bcma_gpio_request; |
| chip->free = bcma_gpio_free; |
| chip->get = bcma_gpio_get_value; |
| chip->set = bcma_gpio_set_value; |
| chip->direction_input = bcma_gpio_direction_input; |
| chip->direction_output = bcma_gpio_direction_output; |
| chip->parent = bus->dev; |
| chip->fwnode = dev_fwnode(&cc->core->dev); |
| |
| switch (bus->chipinfo.id) { |
| case BCMA_CHIP_ID_BCM4707: |
| case BCMA_CHIP_ID_BCM5357: |
| case BCMA_CHIP_ID_BCM53572: |
| case BCMA_CHIP_ID_BCM53573: |
| case BCMA_CHIP_ID_BCM47094: |
| chip->ngpio = 32; |
| break; |
| default: |
| chip->ngpio = 16; |
| } |
| |
| /* |
| * Register SoC GPIO devices with absolute GPIO pin base. |
| * On MIPS, we don't have Device Tree and we can't use relative (per chip) |
| * GPIO numbers. |
| * On some ARM devices, user space may want to access some system GPIO |
| * pins directly, which is easier to do with a predictable GPIO base. |
| */ |
| if (IS_BUILTIN(CONFIG_BCM47XX) || |
| cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC) |
| chip->base = bus->num * BCMA_GPIO_MAX_PINS; |
| else |
| chip->base = -1; |
| |
| err = bcma_gpio_irq_init(cc); |
| if (err) |
| return err; |
| |
| err = gpiochip_add_data(chip, cc); |
| if (err) { |
| bcma_gpio_irq_exit(cc); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| int bcma_gpio_unregister(struct bcma_drv_cc *cc) |
| { |
| bcma_gpio_irq_exit(cc); |
| gpiochip_remove(&cc->gpio); |
| return 0; |
| } |