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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/gpio/gpio-bcm-kona.c
Initial import
Diffstat (limited to 'drivers/gpio/gpio-bcm-kona.c')
-rw-r--r--drivers/gpio/gpio-bcm-kona.c680
1 files changed, 680 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
new file mode 100644
index 000000000..b164ce837
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-kona.c
@@ -0,0 +1,680 @@
+/*
+ * 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.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/module.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;
+ 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 struct bcm_kona_gpio *to_kona_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct bcm_kona_gpio, gpio_chip);
+}
+
+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);
+
+ 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);
+
+ 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);
+
+ 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);
+
+ spin_unlock_irqrestore(&kona_gpio->lock, flags);
+}
+
+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 = to_kona_gpio(chip);
+ reg_base = kona_gpio->reg_base;
+ spin_lock_irqsave(&kona_gpio->lock, flags);
+
+ /* determine the GPIO pin direction */
+ val = readl(reg_base + GPIO_CONTROL(gpio));
+ val &= GPIO_GPCTR0_IOTR_MASK;
+
+ /* this function only applies to output pin */
+ if (GPIO_GPCTR0_IOTR_CMD_INPUT == val)
+ 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:
+ 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 = to_kona_gpio(chip);
+ reg_base = kona_gpio->reg_base;
+ spin_lock_irqsave(&kona_gpio->lock, flags);
+
+ /* determine the GPIO pin direction */
+ val = readl(reg_base + GPIO_CONTROL(gpio));
+ val &= GPIO_GPCTR0_IOTR_MASK;
+
+ /* read the GPIO bank status */
+ reg_offset = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ?
+ GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id);
+ val = readl(reg_base + reg_offset);
+
+ 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 = to_kona_gpio(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 = to_kona_gpio(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 = to_kona_gpio(chip);
+ reg_base = kona_gpio->reg_base;
+ 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));
+
+ 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 = to_kona_gpio(chip);
+ reg_base = kona_gpio->reg_base;
+ 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);
+
+ 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 = to_kona_gpio(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 = to_kona_gpio(chip);
+ reg_base = kona_gpio->reg_base;
+ /* debounce must be 1-128ms (or 0) */
+ if ((debounce > 0 && debounce < 1000) || debounce > 128000) {
+ dev_err(chip->dev, "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 */
+ 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));
+
+ spin_unlock_irqrestore(&kona_gpio->lock, flags);
+
+ return 0;
+}
+
+static struct gpio_chip template_chip = {
+ .label = "bcm-kona-gpio",
+ .owner = THIS_MODULE,
+ .request = bcm_kona_gpio_request,
+ .free = bcm_kona_gpio_free,
+ .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_debounce = bcm_kona_gpio_set_debounce,
+ .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;
+ 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));
+
+ 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;
+ 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));
+
+ 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;
+ 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));
+
+ 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.dev,
+ "Invalid BCM GPIO irq type 0x%x\n", type);
+ return -EINVAL;
+ }
+
+ 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));
+
+ spin_unlock_irqrestore(&kona_gpio->lock, flags);
+
+ return 0;
+}
+
+static void bcm_kona_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ void __iomem *reg_base;
+ int bit, bank_id;
+ unsigned long sta;
+ struct bcm_kona_gpio_bank *bank = irq_get_handler_data(irq);
+ 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);
+
+ if (gpiochip_lock_as_irq(&kona_gpio->gpio_chip, d->hwirq)) {
+ dev_err(kona_gpio->gpio_chip.dev,
+ "unable to lock HW IRQ %lu for IRQ\n",
+ d->hwirq);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+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_unlock_as_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" },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, bcm_kona_gpio_of_match);
+
+/*
+ * 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 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);
+ irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ irq_set_noprobe(irq);
+#endif
+
+ 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 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(kona_gpio, 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(kona_gpio, 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 resource *res;
+ 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;
+ kona_gpio->num_bank = of_irq_count(dev->of_node);
+ if (kona_gpio->num_bank == 0) {
+ dev_err(dev, "Couldn't determine # GPIO banks\n");
+ return -ENOENT;
+ }
+ 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_kzalloc(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;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ kona_gpio->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(kona_gpio->reg_base)) {
+ ret = -ENXIO;
+ 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 = gpiochip_add(chip);
+ if (ret < 0) {
+ dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret);
+ goto err_irq_domain;
+ }
+ for (i = 0; i < chip->ngpio; i++) {
+ int irq = bcm_kona_gpio_to_irq(chip, i);
+ irq_set_lockdep_class(irq, &gpio_lock_class);
+ irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip,
+ handle_simple_irq);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ irq_set_noprobe(irq);
+#endif
+ }
+ for (i = 0; i < kona_gpio->num_bank; i++) {
+ bank = &kona_gpio->banks[i];
+ irq_set_chained_handler(bank->irq, bcm_kona_gpio_irq_handler);
+ irq_set_handler_data(bank->irq, bank);
+ }
+
+ 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,
+};
+
+module_platform_driver(bcm_kona_gpio_driver);
+
+MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Kona GPIO Driver");
+MODULE_LICENSE("GPL v2");