--- /dev/null
+/*
+ * Copyright 2015 IBM Corp.
+ *
+ * Joel Stanley <joel@jms.id.au>
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/gpio/driver.h>
+#include <linux/pinctrl/consumer.h>
+
+struct aspeed_gpio {
+ struct gpio_chip chip;
+ spinlock_t lock;
+ void __iomem *base;
+ int irq;
+};
+
+struct aspeed_gpio_bank {
+ uint16_t val_regs;
+ uint16_t irq_regs;
+ const char names[4];
+};
+
+static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
+ {
+ .val_regs = 0x0000,
+ .irq_regs = 0x0008,
+ .names = { 'A', 'B', 'C', 'D' },
+ },
+ {
+ .val_regs = 0x0020,
+ .irq_regs = 0x0028,
+ .names = { 'E', 'F', 'G', 'H' },
+ },
+ {
+ .val_regs = 0x0070,
+ .irq_regs = 0x0098,
+ .names = { 'I', 'J', 'K', 'L' },
+ },
+ {
+ .val_regs = 0x0078,
+ .irq_regs = 0x00e8,
+ .names = { 'M', 'N', 'O', 'P' },
+ },
+ {
+ .val_regs = 0x0080,
+ .irq_regs = 0x0118,
+ .names = { 'Q', 'R', 'S', 'T' },
+ },
+ {
+ .val_regs = 0x0088,
+ .irq_regs = 0x0148,
+ .names = { 'U', 'V', 'W', 'X' },
+ },
+ /*
+ * A bank exists for { 'Y', 'Z', "AA", "AB" }, but is not implemented.
+ * Only half of GPIOs Y support interrupt configuration, and none of Z,
+ * AA or AB do as they are output only.
+ */
+};
+
+#define GPIO_BANK(x) ((x) >> 5)
+#define GPIO_OFFSET(x) ((x) & 0x1f)
+#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
+
+#define GPIO_DATA 0x00
+#define GPIO_DIR 0x04
+
+#define GPIO_IRQ_ENABLE 0x00
+#define GPIO_IRQ_TYPE0 0x04
+#define GPIO_IRQ_TYPE1 0x08
+#define GPIO_IRQ_TYPE2 0x0c
+#define GPIO_IRQ_STATUS 0x10
+
+static const struct aspeed_gpio_bank *to_bank(unsigned int offset)
+{
+ unsigned int bank = GPIO_BANK(offset);
+
+ WARN_ON(bank > ARRAY_SIZE(aspeed_gpio_banks));
+ return &aspeed_gpio_banks[bank];
+}
+
+static void __iomem *bank_val_reg(struct aspeed_gpio *gpio,
+ const struct aspeed_gpio_bank *bank,
+ unsigned int reg)
+{
+ return gpio->base + bank->val_regs + reg;
+}
+
+static void __iomem *bank_irq_reg(struct aspeed_gpio *gpio,
+ const struct aspeed_gpio_bank *bank,
+ unsigned int reg)
+{
+ return gpio->base + bank->irq_regs + reg;
+}
+
+static int aspeed_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct aspeed_gpio *gpio = gpiochip_get_data(gc);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+
+ return !!(ioread32(bank_val_reg(gpio, bank, GPIO_DATA))
+ & GPIO_BIT(offset));
+}
+
+static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int val)
+{
+ struct aspeed_gpio *gpio = gpiochip_get_data(gc);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ void __iomem *addr;
+ u32 reg;
+
+ addr = bank_val_reg(gpio, bank, GPIO_DATA);
+ reg = ioread32(addr);
+
+ if (val)
+ reg |= GPIO_BIT(offset);
+ else
+ reg &= ~GPIO_BIT(offset);
+
+ iowrite32(reg, addr);
+}
+
+static void aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int val)
+{
+ struct aspeed_gpio *gpio = gpiochip_get_data(gc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&gpio->lock, flags);
+
+ __aspeed_gpio_set(gc, offset, val);
+
+ spin_unlock_irqrestore(&gpio->lock, flags);
+}
+
+static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
+{
+ struct aspeed_gpio *gpio = gpiochip_get_data(gc);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&gpio->lock, flags);
+
+ reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR));
+ iowrite32(reg & ~GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR));
+
+ spin_unlock_irqrestore(&gpio->lock, flags);
+
+ return 0;
+}
+
+static int aspeed_gpio_dir_out(struct gpio_chip *gc,
+ unsigned int offset, int val)
+{
+ struct aspeed_gpio *gpio = gpiochip_get_data(gc);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&gpio->lock, flags);
+
+ reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR));
+ iowrite32(reg | GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR));
+
+ __aspeed_gpio_set(gc, offset, val);
+
+ spin_unlock_irqrestore(&gpio->lock, flags);
+
+ return 0;
+}
+
+static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct aspeed_gpio *gpio = gpiochip_get_data(gc);
+ const struct aspeed_gpio_bank *bank = to_bank(offset);
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(&gpio->lock, flags);
+
+ val = ioread32(bank_val_reg(gpio, bank, GPIO_DIR)) & GPIO_BIT(offset);
+
+ spin_unlock_irqrestore(&gpio->lock, flags);
+
+ return !val;
+
+}
+
+static inline int irqd_to_aspeed_gpio_data(struct irq_data *d,
+ struct aspeed_gpio **gpio,
+ const struct aspeed_gpio_bank **bank,
+ u32 *bit)
+{
+ int offset;
+
+ offset = irqd_to_hwirq(d);
+
+ *gpio = irq_data_get_irq_chip_data(d);
+ *bank = to_bank(offset);
+ *bit = GPIO_BIT(offset);
+
+ return 0;
+}
+
+static void aspeed_gpio_irq_ack(struct irq_data *d)
+{
+ const struct aspeed_gpio_bank *bank;
+ struct aspeed_gpio *gpio;
+ unsigned long flags;
+ void __iomem *status_addr;
+ u32 bit;
+ int rc;
+
+ rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit);
+ if (rc)
+ return;
+
+ status_addr = bank_irq_reg(gpio, bank, GPIO_IRQ_STATUS);
+
+ spin_lock_irqsave(&gpio->lock, flags);
+ iowrite32(bit, status_addr);
+ spin_unlock_irqrestore(&gpio->lock, flags);
+}
+
+static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set)
+{
+ const struct aspeed_gpio_bank *bank;
+ struct aspeed_gpio *gpio;
+ unsigned long flags;
+ u32 reg, bit;
+ void __iomem *addr;
+ int rc;
+
+ rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit);
+ if (rc)
+ return;
+
+ addr = bank_irq_reg(gpio, bank, GPIO_IRQ_ENABLE);
+
+ spin_lock_irqsave(&gpio->lock, flags);
+
+ reg = ioread32(addr);
+ if (set)
+ reg |= bit;
+ else
+ reg &= bit;
+ iowrite32(reg, addr);
+
+ spin_unlock_irqrestore(&gpio->lock, flags);
+}
+
+static void aspeed_gpio_irq_mask(struct irq_data *d)
+{
+ aspeed_gpio_irq_set_mask(d, false);
+}
+
+static void aspeed_gpio_irq_unmask(struct irq_data *d)
+{
+ aspeed_gpio_irq_set_mask(d, true);
+}
+
+static int aspeed_gpio_set_type(struct irq_data *d, unsigned int type)
+{
+ u32 type0 = 0;
+ u32 type1 = 0;
+ u32 type2 = 0;
+ u32 bit, reg;
+ const struct aspeed_gpio_bank *bank;
+ irq_flow_handler_t handler;
+ struct aspeed_gpio *gpio;
+ unsigned long flags;
+ void __iomem *addr;
+ int rc;
+
+ rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit);
+ if (rc)
+ return -EINVAL;
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_BOTH:
+ type2 |= bit;
+ case IRQ_TYPE_EDGE_RISING:
+ type0 |= bit;
+ case IRQ_TYPE_EDGE_FALLING:
+ handler = handle_edge_irq;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ type0 |= bit;
+ case IRQ_TYPE_LEVEL_LOW:
+ type1 |= bit;
+ handler = handle_level_irq;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio->lock, flags);
+
+ addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE0);
+ reg = ioread32(addr);
+ reg = (reg & ~bit) | type0;
+ iowrite32(reg, addr);
+
+ addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE1);
+ reg = ioread32(addr);
+ reg = (reg & ~bit) | type1;
+ iowrite32(reg, addr);
+
+ addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE2);
+ reg = ioread32(addr);
+ reg = (reg & ~bit) | type2;
+ iowrite32(reg, addr);
+
+ spin_unlock_irqrestore(&gpio->lock, flags);
+
+ irq_set_handler_locked(d, handler);
+
+ return 0;
+}
+
+static void aspeed_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct irq_chip *ic = irq_desc_get_chip(desc);
+ struct aspeed_gpio *data = gpiochip_get_data(gc);
+ unsigned int i, p, girq;
+ unsigned long reg;
+
+ chained_irq_enter(ic, desc);
+
+ for (i = 0; i < ARRAY_SIZE(aspeed_gpio_banks); i++) {
+ const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i];
+
+ reg = ioread32(bank_irq_reg(data, bank, GPIO_IRQ_STATUS));
+
+ for_each_set_bit(p, ®, 32) {
+ girq = irq_find_mapping(gc->irqdomain, i * 32 + p);
+ generic_handle_irq(girq);
+ }
+
+ }
+
+ chained_irq_exit(ic, desc);
+}
+
+static struct irq_chip aspeed_gpio_irqchip = {
+ .name = "aspeed-gpio",
+ .irq_ack = aspeed_gpio_irq_ack,
+ .irq_mask = aspeed_gpio_irq_mask,
+ .irq_unmask = aspeed_gpio_irq_unmask,
+ .irq_set_type = aspeed_gpio_set_type,
+};
+
+static int aspeed_gpio_setup_irqs(struct aspeed_gpio *gpio,
+ struct platform_device *pdev)
+{
+ int rc;
+
+ rc = platform_get_irq(pdev, 0);
+ if (rc < 0)
+ return rc;
+
+ gpio->irq = rc;
+
+ rc = gpiochip_irqchip_add(&gpio->chip, &aspeed_gpio_irqchip,
+ 0, handle_bad_irq, IRQ_TYPE_NONE);
+ if (rc) {
+ dev_info(&pdev->dev, "Could not add irqchip\n");
+ return rc;
+ }
+
+ gpiochip_set_chained_irqchip(&gpio->chip, &aspeed_gpio_irqchip,
+ gpio->irq, aspeed_gpio_irq_handler);
+
+ return 0;
+}
+
+static int aspeed_gpio_request(struct gpio_chip *chip, unsigned int offset)
+{
+ return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void aspeed_gpio_free(struct gpio_chip *chip, unsigned int offset)
+{
+ pinctrl_free_gpio(chip->base + offset);
+}
+
+static int __init aspeed_gpio_probe(struct platform_device *pdev)
+{
+ struct aspeed_gpio *gpio;
+ struct resource *res;
+ int rc;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENXIO;
+
+ gpio->base = devm_ioremap_resource(&pdev->dev, res);
+ if (!gpio->base)
+ return -ENOMEM;
+
+ spin_lock_init(&gpio->lock);
+
+ gpio->chip.ngpio = ARRAY_SIZE(aspeed_gpio_banks) * 32;
+
+ gpio->chip.parent = &pdev->dev;
+ gpio->chip.direction_input = aspeed_gpio_dir_in;
+ gpio->chip.direction_output = aspeed_gpio_dir_out;
+ gpio->chip.get_direction = aspeed_gpio_get_direction;
+ gpio->chip.request = aspeed_gpio_request;
+ gpio->chip.free = aspeed_gpio_free;
+ gpio->chip.get = aspeed_gpio_get;
+ gpio->chip.set = aspeed_gpio_set;
+ gpio->chip.label = dev_name(&pdev->dev);
+ gpio->chip.base = -1;
+
+ rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+ if (rc < 0)
+ return rc;
+
+ return aspeed_gpio_setup_irqs(gpio, pdev);
+}
+
+static const struct of_device_id aspeed_gpio_of_table[] = {
+ { .compatible = "aspeed,ast2400-gpio" },
+ { .compatible = "aspeed,ast2500-gpio" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, aspeed_gpio_of_table);
+
+static struct platform_driver aspeed_gpio_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = aspeed_gpio_of_table,
+ },
+};
+
+module_platform_driver_probe(aspeed_gpio_driver, aspeed_gpio_probe);
+
+MODULE_DESCRIPTION("Aspeed GPIO Driver");
projects / deliverable / linux.git / blobdiff