[PATCH v1 1/3] gpio: gpio-hisi: Add HiSilicon GPIO support
From: Luo Jiaxing
Date: Wed Dec 02 2020 - 04:33:07 EST
This GPIO driver is for HiSilicon's ARM SoC.
HiSilicon's GPIO controller support double-edge interrupt and multi-core
concurrent access.
ACPI table example for this GPIO controller:
Device (GPO0)
{
Name (_HID, "HISI0184")
Device (PRTA)
{
Name (_ADR, Zero)
Name (_UID, Zero)
Name (_DSD, Package (0x01)
{
Package (0x02)
{
"hisi-ngpio",
0x20
}
})
}
}
Signed-off-by: Luo Jiaxing <luojiaxing@xxxxxxxxxx>
---
drivers/gpio/Kconfig | 11 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-hisi.c | 356 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 368 insertions(+)
create mode 100644 drivers/gpio/gpio-hisi.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 5d4de5c..0f5d4c6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -296,6 +296,17 @@ config GPIO_GRGPIO
Select this to support Aeroflex Gaisler GRGPIO cores from the GRLIB
VHDL IP core library.
+config GPIO_HISI
+ tristate "HISILICON GPIO controller driver"
+ depends on (ARM64 && ACPI) || COMPILE_TEST
+ select GPIO_GENERIC
+ select GENERIC_IRQ_CHIP
+ help
+ Say Y or M here to build support for the HiSilicon GPIO controller driver
+ GPIO block.
+ This controller support double-edge interrupt and multi-core concurrent
+ access.
+
config GPIO_HLWD
tristate "Nintendo Wii (Hollywood) GPIO"
depends on OF_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 09dada8..260ae25 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o
obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o
obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o
obj-$(CONFIG_GPIO_GW_PLD) += gpio-gw-pld.o
+obj-$(CONFIG_GPIO_HISI) += gpio-hisi.o
obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o
obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o
obj-$(CONFIG_GPIO_ICH) += gpio-ich.o
diff --git a/drivers/gpio/gpio-hisi.c b/drivers/gpio/gpio-hisi.c
new file mode 100644
index 0000000..ab076ca
--- /dev/null
+++ b/drivers/gpio/gpio-hisi.c
@@ -0,0 +1,356 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 HiSilicon Limited.
+ */
+#include <linux/acpi.h>
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#include "gpiolib.h"
+#include "gpiolib-acpi.h"
+
+#define HISI_GPIO_SWPORT_DR_SET_WX 0x0
+#define HISI_GPIO_SWPORT_DR_CLR_WX 0x4
+#define HISI_GPIO_SWPORT_DDR_SET_WX 0x10
+#define HISI_GPIO_SWPORT_DDR_CLR_WX 0x14
+#define HISI_GPIO_SWPORT_DDR_ST_WX 0x18
+#define HISI_GPIO_INTEN_SET_WX 0x20
+#define HISI_GPIO_INTEN_CLR_WX 0x24
+#define HISI_GPIO_INTMASK_SET_WX 0x30
+#define HISI_GPIO_INTMASK_CLR_WX 0x34
+#define HISI_GPIO_INTTYPE_EDGE_SET_WX 0x40
+#define HISI_GPIO_INTTYPE_EDGE_CLR_WX 0x44
+#define HISI_GPIO_INT_POLARITY_SET_WX 0x50
+#define HISI_GPIO_INT_POLARITY_CLR_WX 0x54
+#define HISI_GPIO_DEBOUNCE_SET_WX 0x60
+#define HISI_GPIO_DEBOUNCE_CLR_WX 0x64
+#define HISI_GPIO_INTSTATUS_WX 0x70
+#define HISI_GPIO_PORTA_EOI_WX 0x78
+#define HISI_GPIO_EXT_PORT_WX 0x80
+#define HISI_GPIO_INTCOMB_MASK_WX 0xa0
+#define HISI_GPIO_INT_DEDGE_SET 0xb0
+#define HISI_GPIO_INT_DEDGE_CLR 0xb4
+#define HISI_GPIO_INT_DEDGE_ST 0xb8
+
+#define HISI_GPIO_REG_SIZE 0x4
+#define HISI_GPIO_REG_MAX 0x100
+#define HISI_GPIO_PIN_NUM_MAX 32
+
+#define HISI_GPIO_DRIVER_NAME "gpio-hisi"
+
+struct hisi_gpio {
+ struct device *dev;
+ void __iomem *reg_base;
+ unsigned int pin_num;
+ struct gpio_chip chip;
+ struct irq_chip irq_chip;
+ int irq;
+};
+
+static inline u32 hisi_gpio_read_reg(struct gpio_chip *chip,
+ unsigned int off)
+{
+ struct hisi_gpio *hisi_gpio =
+ container_of(chip, struct hisi_gpio, chip);
+
+ return chip->read_reg(hisi_gpio->reg_base + off);
+}
+
+static inline void hisi_gpio_write_reg(struct gpio_chip *chip,
+ unsigned int off, u32 val)
+{
+ struct hisi_gpio *hisi_gpio =
+ container_of(chip, struct hisi_gpio, chip);
+
+ chip->write_reg(hisi_gpio->reg_base + off, val);
+}
+
+static void hisi_gpio_set_debounce(struct gpio_chip *chip, unsigned int off,
+ u32 debounce)
+{
+ unsigned long mask = BIT(off);
+
+ if (debounce)
+ hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_SET_WX, mask);
+ else
+ hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_CLR_WX, mask);
+}
+
+static int hisi_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+ unsigned long config)
+{
+ u32 config_para = pinconf_to_config_param(config);
+ u32 config_arg;
+
+ switch (config_para) {
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ config_arg = pinconf_to_config_argument(config);
+ hisi_gpio_set_debounce(chip, offset, config_arg);
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static int hisi_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
+{
+ /* Return 0 if output, 1 if input */
+ if (hisi_gpio_read_reg(chip, HISI_GPIO_SWPORT_DDR_ST_WX) & BIT(gpio))
+ return GPIO_LINE_DIRECTION_OUT;
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int hisi_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int gpio,
+ int val)
+{
+ hisi_gpio_write_reg(chip, HISI_GPIO_SWPORT_DDR_SET_WX, BIT(gpio));
+ chip->set(chip, gpio, val);
+ return 0;
+}
+
+static int hisi_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int gpio)
+{
+ hisi_gpio_write_reg(chip, HISI_GPIO_SWPORT_DDR_CLR_WX, BIT(gpio));
+ return 0;
+}
+
+void hisi_gpio_set_ack(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ hisi_gpio_write_reg(chip, HISI_GPIO_PORTA_EOI_WX, BIT(irqd_to_hwirq(d)));
+}
+
+static void hisi_gpio_irq_set_mask(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_SET_WX, BIT(irqd_to_hwirq(d)));
+}
+
+static void hisi_gpio_irq_clr_mask(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_CLR_WX, BIT(irqd_to_hwirq(d)));
+}
+
+static int hisi_gpio_irq_set_type(struct irq_data *d, u32 type)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ unsigned int mask = BIT(irqd_to_hwirq(d));
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_SET, mask);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
+ hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
+ hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
+ hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
+ hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
+ default:
+ return -EINVAL;
+ }
+
+ /*
+ * The dual-edge interrupt and other interrupt's registers do not
+ * take effect at the same time. The registers of the two-edge
+ * interrupts have higher priorities, the configuration of
+ * the dual-edge interrupts must be disabled before the configuration
+ * of other kind of interrupts.
+ */
+ if (type != IRQ_TYPE_EDGE_BOTH) {
+ unsigned int both = hisi_gpio_read_reg(chip, HISI_GPIO_INT_DEDGE_ST);
+
+ if (both & mask)
+ hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_CLR, mask);
+ }
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else if (type & IRQ_TYPE_EDGE_BOTH)
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ return 0;
+}
+
+static void hisi_gpio_irq_enable(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ hisi_gpio_irq_clr_mask(d);
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_SET_WX, BIT(irqd_to_hwirq(d)));
+}
+
+static void hisi_gpio_irq_disable(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+ hisi_gpio_irq_set_mask(d);
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_CLR_WX, BIT(irqd_to_hwirq(d)));
+}
+
+static void hisi_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct hisi_gpio *hisi_gpio = irq_desc_get_handler_data(desc);
+ u32 irq_msk = hisi_gpio_read_reg(&hisi_gpio->chip,
+ HISI_GPIO_INTSTATUS_WX);
+ struct irq_chip *irq_c = irq_desc_get_chip(desc);
+
+ chained_irq_enter(irq_c, desc);
+ while (irq_msk) {
+ int hwirq = fls(irq_msk) - 1;
+ int gpio_irq = irq_find_mapping(hisi_gpio->chip.irq.domain,
+ hwirq);
+
+ generic_handle_irq(gpio_irq);
+ irq_msk &= ~BIT(hwirq);
+ }
+ chained_irq_exit(irq_c, desc);
+}
+
+static void hisi_gpio_init_irq(struct hisi_gpio *hisi_gpio)
+{
+ struct gpio_chip *chip = &hisi_gpio->chip;
+ struct gpio_irq_chip *girq_chip = &chip->irq;
+
+ /* Set hooks for irq_chip */
+ hisi_gpio->irq_chip.irq_ack = hisi_gpio_set_ack;
+ hisi_gpio->irq_chip.irq_mask = hisi_gpio_irq_set_mask;
+ hisi_gpio->irq_chip.irq_unmask = hisi_gpio_irq_clr_mask;
+ hisi_gpio->irq_chip.irq_set_type = hisi_gpio_irq_set_type;
+ hisi_gpio->irq_chip.irq_enable = hisi_gpio_irq_enable;
+ hisi_gpio->irq_chip.irq_disable = hisi_gpio_irq_disable;
+
+ girq_chip->chip = &hisi_gpio->irq_chip;
+ girq_chip->default_type = IRQ_TYPE_NONE;
+ girq_chip->num_parents = 1;
+ girq_chip->parents = &hisi_gpio->irq;
+ girq_chip->parent_handler = hisi_gpio_irq_handler;
+ girq_chip->parent_handler_data = hisi_gpio;
+
+ /* Clear Mask of GPIO controller combine IRQ */
+ hisi_gpio_write_reg(chip, HISI_GPIO_INTCOMB_MASK_WX, 1);
+}
+
+static const struct acpi_device_id hisi_gpio_acpi_match[] = {
+ {"HISI0184", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match);
+
+static void hisi_gpio_get_pdata(struct device *dev,
+ struct hisi_gpio *hisi_gpio)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct fwnode_handle *fwnode;
+ int idx = 0;
+
+ device_for_each_child_node(dev, fwnode) {
+ if (fwnode_property_read_u32(fwnode, "hisi-ngpio",
+ &hisi_gpio->pin_num)) {
+ dev_err(dev,
+ "failed to get number of gpios for port%d and use default value instead\n",
+ idx);
+ hisi_gpio->pin_num = HISI_GPIO_PIN_NUM_MAX;
+ }
+
+ if (hisi_gpio->pin_num > HISI_GPIO_PIN_NUM_MAX)
+ hisi_gpio->pin_num = HISI_GPIO_PIN_NUM_MAX;
+
+ hisi_gpio->irq = platform_get_irq(pdev, idx);
+
+ dev_info(dev,
+ "get hisi_gpio[%d] with %d gpios and irq[%d]\n", idx,
+ hisi_gpio->pin_num, hisi_gpio->irq);
+
+ idx++;
+ }
+}
+
+static int hisi_gpio_probe(struct platform_device *platform_dev)
+{
+ struct device *dev = &platform_dev->dev;
+ void __iomem *dat, *set, *clr;
+ struct hisi_gpio *hisi_gpio;
+ int port_num;
+ int res;
+
+ /* One HiSilicon GPIO controller own one port with 32 pins */
+ port_num = device_get_child_node_count(dev);
+ if (port_num != 1)
+ return -ENODEV;
+
+ hisi_gpio = devm_kzalloc(dev, sizeof(*hisi_gpio), GFP_KERNEL);
+ if (!hisi_gpio)
+ return -ENOMEM;
+
+ hisi_gpio->reg_base = devm_platform_ioremap_resource(platform_dev, 0);
+ if (IS_ERR(hisi_gpio->reg_base))
+ return PTR_ERR(hisi_gpio->reg_base);
+
+ hisi_gpio_get_pdata(dev, hisi_gpio);
+
+ hisi_gpio->dev = dev;
+
+ dat = hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX;
+ set = hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX;
+ clr = hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX;
+
+ res = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, HISI_GPIO_REG_SIZE, dat, set,
+ clr, NULL, NULL, 0);
+ if (res) {
+ dev_err(dev, "failed to init\n");
+ return res;
+ }
+
+ hisi_gpio->chip.direction_output = hisi_gpio_direction_output;
+ hisi_gpio->chip.direction_input = hisi_gpio_direction_input;
+ hisi_gpio->chip.get_direction = hisi_gpio_get_direction;
+ hisi_gpio->chip.set_config = hisi_gpio_set_config;
+ hisi_gpio->chip.ngpio = hisi_gpio->pin_num;
+ hisi_gpio->chip.base = -1;
+
+ if (hisi_gpio->irq > 0)
+ hisi_gpio_init_irq(hisi_gpio);
+
+ res = devm_gpiochip_add_data(dev, &hisi_gpio->chip, hisi_gpio);
+ if (res) {
+ dev_err(dev, "failed to register gpiochip\n");
+ return res;
+ }
+
+ return 0;
+}
+
+static struct platform_driver hisi_gpio_driver = {
+ .driver = {
+ .name = HISI_GPIO_DRIVER_NAME,
+ .acpi_match_table = ACPI_PTR(hisi_gpio_acpi_match),
+ },
+ .probe = hisi_gpio_probe,
+};
+
+module_platform_driver(hisi_gpio_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Luo Jiaxing <luojiaxing@xxxxxxxxxx>");
+MODULE_DESCRIPTION("HiSilicon GPIO controller driver");
+MODULE_ALIAS("platform:" HISI_GPIO_DRIVER_NAME);
--
2.7.4