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