| /* |
| * Broadcom Kona GPIO Driver |
| * |
| * Author: Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com> |
| * Copyright (C) 2012-2014 Broadcom Corporation |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation version 2. |
| * |
| * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| * kind, whether express or implied; without even the implied warranty |
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/gpio/driver.h> |
| #include <linux/of_device.h> |
| #include <linux/init.h> |
| #include <linux/irqdomain.h> |
| #include <linux/irqchip/chained_irq.h> |
| |
| #define BCM_GPIO_PASSWD 0x00a5a501 |
| #define GPIO_PER_BANK 32 |
| #define GPIO_MAX_BANK_NUM 8 |
| |
| #define GPIO_BANK(gpio) ((gpio) >> 5) |
| #define GPIO_BIT(gpio) ((gpio) & (GPIO_PER_BANK - 1)) |
| |
| /* There is a GPIO control register for each GPIO */ |
| #define GPIO_CONTROL(gpio) (0x00000100 + ((gpio) << 2)) |
| |
| /* The remaining registers are per GPIO bank */ |
| #define GPIO_OUT_STATUS(bank) (0x00000000 + ((bank) << 2)) |
| #define GPIO_IN_STATUS(bank) (0x00000020 + ((bank) << 2)) |
| #define GPIO_OUT_SET(bank) (0x00000040 + ((bank) << 2)) |
| #define GPIO_OUT_CLEAR(bank) (0x00000060 + ((bank) << 2)) |
| #define GPIO_INT_STATUS(bank) (0x00000080 + ((bank) << 2)) |
| #define GPIO_INT_MASK(bank) (0x000000a0 + ((bank) << 2)) |
| #define GPIO_INT_MSKCLR(bank) (0x000000c0 + ((bank) << 2)) |
| #define GPIO_PWD_STATUS(bank) (0x00000500 + ((bank) << 2)) |
| |
| #define GPIO_GPPWR_OFFSET 0x00000520 |
| |
| #define GPIO_GPCTR0_DBR_SHIFT 5 |
| #define GPIO_GPCTR0_DBR_MASK 0x000001e0 |
| |
| #define GPIO_GPCTR0_ITR_SHIFT 3 |
| #define GPIO_GPCTR0_ITR_MASK 0x00000018 |
| #define GPIO_GPCTR0_ITR_CMD_RISING_EDGE 0x00000001 |
| #define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE 0x00000002 |
| #define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE 0x00000003 |
| |
| #define GPIO_GPCTR0_IOTR_MASK 0x00000001 |
| #define GPIO_GPCTR0_IOTR_CMD_0UTPUT 0x00000000 |
| #define GPIO_GPCTR0_IOTR_CMD_INPUT 0x00000001 |
| |
| #define GPIO_GPCTR0_DB_ENABLE_MASK 0x00000100 |
| |
| #define LOCK_CODE 0xffffffff |
| #define UNLOCK_CODE 0x00000000 |
| |
| struct bcm_kona_gpio { |
| void __iomem *reg_base; |
| int num_bank; |
| raw_spinlock_t lock; |
| struct gpio_chip gpio_chip; |
| struct irq_domain *irq_domain; |
| struct bcm_kona_gpio_bank *banks; |
| struct platform_device *pdev; |
| }; |
| |
| struct bcm_kona_gpio_bank { |
| int id; |
| int irq; |
| /* Used in the interrupt handler */ |
| struct bcm_kona_gpio *kona_gpio; |
| }; |
| |
| static inline void bcm_kona_gpio_write_lock_regs(void __iomem *reg_base, |
| int bank_id, u32 lockcode) |
| { |
| writel(BCM_GPIO_PASSWD, reg_base + GPIO_GPPWR_OFFSET); |
| writel(lockcode, reg_base + GPIO_PWD_STATUS(bank_id)); |
| } |
| |
| static void bcm_kona_gpio_lock_gpio(struct bcm_kona_gpio *kona_gpio, |
| unsigned gpio) |
| { |
| u32 val; |
| unsigned long flags; |
| int bank_id = GPIO_BANK(gpio); |
| |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id)); |
| val |= BIT(gpio); |
| bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| } |
| |
| static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio, |
| unsigned gpio) |
| { |
| u32 val; |
| unsigned long flags; |
| int bank_id = GPIO_BANK(gpio); |
| |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id)); |
| val &= ~BIT(gpio); |
| bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| } |
| |
| static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip); |
| void __iomem *reg_base = kona_gpio->reg_base; |
| u32 val; |
| |
| val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK; |
| return val ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT; |
| } |
| |
| static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| int bank_id = GPIO_BANK(gpio); |
| int bit = GPIO_BIT(gpio); |
| u32 val, reg_offset; |
| unsigned long flags; |
| |
| kona_gpio = gpiochip_get_data(chip); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| /* this function only applies to output pin */ |
| if (bcm_kona_gpio_get_dir(chip, gpio) == GPIO_LINE_DIRECTION_IN) |
| goto out; |
| |
| reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id); |
| |
| val = readl(reg_base + reg_offset); |
| val |= BIT(bit); |
| writel(val, reg_base + reg_offset); |
| |
| out: |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| } |
| |
| static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| int bank_id = GPIO_BANK(gpio); |
| int bit = GPIO_BIT(gpio); |
| u32 val, reg_offset; |
| unsigned long flags; |
| |
| kona_gpio = gpiochip_get_data(chip); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| if (bcm_kona_gpio_get_dir(chip, gpio) == GPIO_LINE_DIRECTION_IN) |
| reg_offset = GPIO_IN_STATUS(bank_id); |
| else |
| reg_offset = GPIO_OUT_STATUS(bank_id); |
| |
| /* read the GPIO bank status */ |
| val = readl(reg_base + reg_offset); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| |
| /* return the specified bit status */ |
| return !!(val & BIT(bit)); |
| } |
| |
| static int bcm_kona_gpio_request(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip); |
| |
| bcm_kona_gpio_unlock_gpio(kona_gpio, gpio); |
| return 0; |
| } |
| |
| static void bcm_kona_gpio_free(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip); |
| |
| bcm_kona_gpio_lock_gpio(kona_gpio, gpio); |
| } |
| |
| static int bcm_kona_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| u32 val; |
| unsigned long flags; |
| |
| kona_gpio = gpiochip_get_data(chip); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_CONTROL(gpio)); |
| val &= ~GPIO_GPCTR0_IOTR_MASK; |
| val |= GPIO_GPCTR0_IOTR_CMD_INPUT; |
| writel(val, reg_base + GPIO_CONTROL(gpio)); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| |
| return 0; |
| } |
| |
| static int bcm_kona_gpio_direction_output(struct gpio_chip *chip, |
| unsigned gpio, int value) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| int bank_id = GPIO_BANK(gpio); |
| int bit = GPIO_BIT(gpio); |
| u32 val, reg_offset; |
| unsigned long flags; |
| |
| kona_gpio = gpiochip_get_data(chip); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_CONTROL(gpio)); |
| val &= ~GPIO_GPCTR0_IOTR_MASK; |
| val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT; |
| writel(val, reg_base + GPIO_CONTROL(gpio)); |
| reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id); |
| |
| val = readl(reg_base + reg_offset); |
| val |= BIT(bit); |
| writel(val, reg_base + reg_offset); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| |
| return 0; |
| } |
| |
| static int bcm_kona_gpio_to_irq(struct gpio_chip *chip, unsigned gpio) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| |
| kona_gpio = gpiochip_get_data(chip); |
| if (gpio >= kona_gpio->gpio_chip.ngpio) |
| return -ENXIO; |
| return irq_create_mapping(kona_gpio->irq_domain, gpio); |
| } |
| |
| static int bcm_kona_gpio_set_debounce(struct gpio_chip *chip, unsigned gpio, |
| unsigned debounce) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| u32 val, res; |
| unsigned long flags; |
| |
| kona_gpio = gpiochip_get_data(chip); |
| reg_base = kona_gpio->reg_base; |
| /* debounce must be 1-128ms (or 0) */ |
| if ((debounce > 0 && debounce < 1000) || debounce > 128000) { |
| dev_err(chip->parent, "Debounce value %u not in range\n", |
| debounce); |
| return -EINVAL; |
| } |
| |
| /* calculate debounce bit value */ |
| if (debounce != 0) { |
| /* Convert to ms */ |
| debounce /= 1000; |
| /* find the MSB */ |
| res = fls(debounce) - 1; |
| /* Check if MSB-1 is set (round up or down) */ |
| if (res > 0 && (debounce & BIT(res - 1))) |
| res++; |
| } |
| |
| /* spin lock for read-modify-write of the GPIO register */ |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_CONTROL(gpio)); |
| val &= ~GPIO_GPCTR0_DBR_MASK; |
| |
| if (debounce == 0) { |
| /* disable debounce */ |
| val &= ~GPIO_GPCTR0_DB_ENABLE_MASK; |
| } else { |
| val |= GPIO_GPCTR0_DB_ENABLE_MASK | |
| (res << GPIO_GPCTR0_DBR_SHIFT); |
| } |
| |
| writel(val, reg_base + GPIO_CONTROL(gpio)); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| |
| return 0; |
| } |
| |
| static int bcm_kona_gpio_set_config(struct gpio_chip *chip, unsigned gpio, |
| unsigned long config) |
| { |
| u32 debounce; |
| |
| if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) |
| return -ENOTSUPP; |
| |
| debounce = pinconf_to_config_argument(config); |
| return bcm_kona_gpio_set_debounce(chip, gpio, debounce); |
| } |
| |
| static const struct gpio_chip template_chip = { |
| .label = "bcm-kona-gpio", |
| .owner = THIS_MODULE, |
| .request = bcm_kona_gpio_request, |
| .free = bcm_kona_gpio_free, |
| .get_direction = bcm_kona_gpio_get_dir, |
| .direction_input = bcm_kona_gpio_direction_input, |
| .get = bcm_kona_gpio_get, |
| .direction_output = bcm_kona_gpio_direction_output, |
| .set = bcm_kona_gpio_set, |
| .set_config = bcm_kona_gpio_set_config, |
| .to_irq = bcm_kona_gpio_to_irq, |
| .base = 0, |
| }; |
| |
| static void bcm_kona_gpio_irq_ack(struct irq_data *d) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| unsigned gpio = d->hwirq; |
| int bank_id = GPIO_BANK(gpio); |
| int bit = GPIO_BIT(gpio); |
| u32 val; |
| unsigned long flags; |
| |
| kona_gpio = irq_data_get_irq_chip_data(d); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_INT_STATUS(bank_id)); |
| val |= BIT(bit); |
| writel(val, reg_base + GPIO_INT_STATUS(bank_id)); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| } |
| |
| static void bcm_kona_gpio_irq_mask(struct irq_data *d) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| unsigned gpio = d->hwirq; |
| int bank_id = GPIO_BANK(gpio); |
| int bit = GPIO_BIT(gpio); |
| u32 val; |
| unsigned long flags; |
| |
| kona_gpio = irq_data_get_irq_chip_data(d); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_INT_MASK(bank_id)); |
| val |= BIT(bit); |
| writel(val, reg_base + GPIO_INT_MASK(bank_id)); |
| gpiochip_disable_irq(&kona_gpio->gpio_chip, gpio); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| } |
| |
| static void bcm_kona_gpio_irq_unmask(struct irq_data *d) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| unsigned gpio = d->hwirq; |
| int bank_id = GPIO_BANK(gpio); |
| int bit = GPIO_BIT(gpio); |
| u32 val; |
| unsigned long flags; |
| |
| kona_gpio = irq_data_get_irq_chip_data(d); |
| reg_base = kona_gpio->reg_base; |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_INT_MSKCLR(bank_id)); |
| val |= BIT(bit); |
| writel(val, reg_base + GPIO_INT_MSKCLR(bank_id)); |
| gpiochip_enable_irq(&kona_gpio->gpio_chip, gpio); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| } |
| |
| static int bcm_kona_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
| { |
| struct bcm_kona_gpio *kona_gpio; |
| void __iomem *reg_base; |
| unsigned gpio = d->hwirq; |
| u32 lvl_type; |
| u32 val; |
| unsigned long flags; |
| |
| kona_gpio = irq_data_get_irq_chip_data(d); |
| reg_base = kona_gpio->reg_base; |
| switch (type & IRQ_TYPE_SENSE_MASK) { |
| case IRQ_TYPE_EDGE_RISING: |
| lvl_type = GPIO_GPCTR0_ITR_CMD_RISING_EDGE; |
| break; |
| |
| case IRQ_TYPE_EDGE_FALLING: |
| lvl_type = GPIO_GPCTR0_ITR_CMD_FALLING_EDGE; |
| break; |
| |
| case IRQ_TYPE_EDGE_BOTH: |
| lvl_type = GPIO_GPCTR0_ITR_CMD_BOTH_EDGE; |
| break; |
| |
| case IRQ_TYPE_LEVEL_HIGH: |
| case IRQ_TYPE_LEVEL_LOW: |
| /* BCM GPIO doesn't support level triggering */ |
| default: |
| dev_err(kona_gpio->gpio_chip.parent, |
| "Invalid BCM GPIO irq type 0x%x\n", type); |
| return -EINVAL; |
| } |
| |
| raw_spin_lock_irqsave(&kona_gpio->lock, flags); |
| |
| val = readl(reg_base + GPIO_CONTROL(gpio)); |
| val &= ~GPIO_GPCTR0_ITR_MASK; |
| val |= lvl_type << GPIO_GPCTR0_ITR_SHIFT; |
| writel(val, reg_base + GPIO_CONTROL(gpio)); |
| |
| raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); |
| |
| return 0; |
| } |
| |
| static void bcm_kona_gpio_irq_handler(struct irq_desc *desc) |
| { |
| void __iomem *reg_base; |
| int bit, bank_id; |
| unsigned long sta; |
| struct bcm_kona_gpio_bank *bank = irq_desc_get_handler_data(desc); |
| struct irq_chip *chip = irq_desc_get_chip(desc); |
| |
| chained_irq_enter(chip, desc); |
| |
| /* |
| * For bank interrupts, we can't use chip_data to store the kona_gpio |
| * pointer, since GIC needs it for its own purposes. Therefore, we get |
| * our pointer from the bank structure. |
| */ |
| reg_base = bank->kona_gpio->reg_base; |
| bank_id = bank->id; |
| |
| while ((sta = readl(reg_base + GPIO_INT_STATUS(bank_id)) & |
| (~(readl(reg_base + GPIO_INT_MASK(bank_id)))))) { |
| for_each_set_bit(bit, &sta, 32) { |
| int hwirq = GPIO_PER_BANK * bank_id + bit; |
| int child_irq = |
| irq_find_mapping(bank->kona_gpio->irq_domain, |
| hwirq); |
| /* |
| * Clear interrupt before handler is called so we don't |
| * miss any interrupt occurred during executing them. |
| */ |
| writel(readl(reg_base + GPIO_INT_STATUS(bank_id)) | |
| BIT(bit), reg_base + GPIO_INT_STATUS(bank_id)); |
| /* Invoke interrupt handler */ |
| generic_handle_irq(child_irq); |
| } |
| } |
| |
| chained_irq_exit(chip, desc); |
| } |
| |
| static int bcm_kona_gpio_irq_reqres(struct irq_data *d) |
| { |
| struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d); |
| |
| return gpiochip_reqres_irq(&kona_gpio->gpio_chip, d->hwirq); |
| } |
| |
| static void bcm_kona_gpio_irq_relres(struct irq_data *d) |
| { |
| struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d); |
| |
| gpiochip_relres_irq(&kona_gpio->gpio_chip, d->hwirq); |
| } |
| |
| static struct irq_chip bcm_gpio_irq_chip = { |
| .name = "bcm-kona-gpio", |
| .irq_ack = bcm_kona_gpio_irq_ack, |
| .irq_mask = bcm_kona_gpio_irq_mask, |
| .irq_unmask = bcm_kona_gpio_irq_unmask, |
| .irq_set_type = bcm_kona_gpio_irq_set_type, |
| .irq_request_resources = bcm_kona_gpio_irq_reqres, |
| .irq_release_resources = bcm_kona_gpio_irq_relres, |
| }; |
| |
| static struct of_device_id const bcm_kona_gpio_of_match[] = { |
| { .compatible = "brcm,kona-gpio" }, |
| {} |
| }; |
| |
| /* |
| * This lock class tells lockdep that GPIO irqs are in a different |
| * category than their parents, so it won't report false recursion. |
| */ |
| static struct lock_class_key gpio_lock_class; |
| static struct lock_class_key gpio_request_class; |
| |
| static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq, |
| irq_hw_number_t hwirq) |
| { |
| int ret; |
| |
| ret = irq_set_chip_data(irq, d->host_data); |
| if (ret < 0) |
| return ret; |
| irq_set_lockdep_class(irq, &gpio_lock_class, &gpio_request_class); |
| irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq); |
| irq_set_noprobe(irq); |
| |
| return 0; |
| } |
| |
| static void bcm_kona_gpio_irq_unmap(struct irq_domain *d, unsigned int irq) |
| { |
| irq_set_chip_and_handler(irq, NULL, NULL); |
| irq_set_chip_data(irq, NULL); |
| } |
| |
| static const struct irq_domain_ops bcm_kona_irq_ops = { |
| .map = bcm_kona_gpio_irq_map, |
| .unmap = bcm_kona_gpio_irq_unmap, |
| .xlate = irq_domain_xlate_twocell, |
| }; |
| |
| static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio) |
| { |
| void __iomem *reg_base; |
| int i; |
| |
| reg_base = kona_gpio->reg_base; |
| /* disable interrupts and clear status */ |
| for (i = 0; i < kona_gpio->num_bank; i++) { |
| /* Unlock the entire bank first */ |
| bcm_kona_gpio_write_lock_regs(reg_base, i, UNLOCK_CODE); |
| writel(0xffffffff, reg_base + GPIO_INT_MASK(i)); |
| writel(0xffffffff, reg_base + GPIO_INT_STATUS(i)); |
| /* Now re-lock the bank */ |
| bcm_kona_gpio_write_lock_regs(reg_base, i, LOCK_CODE); |
| } |
| } |
| |
| static int bcm_kona_gpio_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| const struct of_device_id *match; |
| struct bcm_kona_gpio_bank *bank; |
| struct bcm_kona_gpio *kona_gpio; |
| struct gpio_chip *chip; |
| int ret; |
| int i; |
| |
| match = of_match_device(bcm_kona_gpio_of_match, dev); |
| if (!match) { |
| dev_err(dev, "Failed to find gpio controller\n"); |
| return -ENODEV; |
| } |
| |
| kona_gpio = devm_kzalloc(dev, sizeof(*kona_gpio), GFP_KERNEL); |
| if (!kona_gpio) |
| return -ENOMEM; |
| |
| kona_gpio->gpio_chip = template_chip; |
| chip = &kona_gpio->gpio_chip; |
| ret = platform_irq_count(pdev); |
| if (!ret) { |
| dev_err(dev, "Couldn't determine # GPIO banks\n"); |
| return -ENOENT; |
| } else if (ret < 0) { |
| return dev_err_probe(dev, ret, "Couldn't determine GPIO banks\n"); |
| } |
| kona_gpio->num_bank = ret; |
| |
| if (kona_gpio->num_bank > GPIO_MAX_BANK_NUM) { |
| dev_err(dev, "Too many GPIO banks configured (max=%d)\n", |
| GPIO_MAX_BANK_NUM); |
| return -ENXIO; |
| } |
| kona_gpio->banks = devm_kcalloc(dev, |
| kona_gpio->num_bank, |
| sizeof(*kona_gpio->banks), |
| GFP_KERNEL); |
| if (!kona_gpio->banks) |
| return -ENOMEM; |
| |
| kona_gpio->pdev = pdev; |
| platform_set_drvdata(pdev, kona_gpio); |
| chip->of_node = dev->of_node; |
| chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK; |
| |
| kona_gpio->irq_domain = irq_domain_add_linear(dev->of_node, |
| chip->ngpio, |
| &bcm_kona_irq_ops, |
| kona_gpio); |
| if (!kona_gpio->irq_domain) { |
| dev_err(dev, "Couldn't allocate IRQ domain\n"); |
| return -ENXIO; |
| } |
| |
| kona_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0); |
| if (IS_ERR(kona_gpio->reg_base)) { |
| ret = PTR_ERR(kona_gpio->reg_base); |
| goto err_irq_domain; |
| } |
| |
| for (i = 0; i < kona_gpio->num_bank; i++) { |
| bank = &kona_gpio->banks[i]; |
| bank->id = i; |
| bank->irq = platform_get_irq(pdev, i); |
| bank->kona_gpio = kona_gpio; |
| if (bank->irq < 0) { |
| dev_err(dev, "Couldn't get IRQ for bank %d", i); |
| ret = -ENOENT; |
| goto err_irq_domain; |
| } |
| } |
| |
| dev_info(&pdev->dev, "Setting up Kona GPIO\n"); |
| |
| bcm_kona_gpio_reset(kona_gpio); |
| |
| ret = devm_gpiochip_add_data(dev, chip, kona_gpio); |
| if (ret < 0) { |
| dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret); |
| goto err_irq_domain; |
| } |
| for (i = 0; i < kona_gpio->num_bank; i++) { |
| bank = &kona_gpio->banks[i]; |
| irq_set_chained_handler_and_data(bank->irq, |
| bcm_kona_gpio_irq_handler, |
| bank); |
| } |
| |
| raw_spin_lock_init(&kona_gpio->lock); |
| |
| return 0; |
| |
| err_irq_domain: |
| irq_domain_remove(kona_gpio->irq_domain); |
| |
| return ret; |
| } |
| |
| static struct platform_driver bcm_kona_gpio_driver = { |
| .driver = { |
| .name = "bcm-kona-gpio", |
| .of_match_table = bcm_kona_gpio_of_match, |
| }, |
| .probe = bcm_kona_gpio_probe, |
| }; |
| builtin_platform_driver(bcm_kona_gpio_driver); |