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linux/drivers/gpio/gpio-hisi.c
Luo Jiaxing 80e493d2b7 MAINTAINERS: Add maintainer for HiSilicon GPIO driver 
Here add maintainer information for HiSilicon GPIO driver.

Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Link: https://lore.kernel.org/r/1607934255-52544-3-git-send-email-luojiaxing@huawei.com
[Dropped some dead code when applying]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-12-16 21:57:27 +01:00

324 lines
9.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2020 HiSilicon Limited. */
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#define HISI_GPIO_SWPORT_DR_SET_WX 0x000
#define HISI_GPIO_SWPORT_DR_CLR_WX 0x004
#define HISI_GPIO_SWPORT_DDR_SET_WX 0x010
#define HISI_GPIO_SWPORT_DDR_CLR_WX 0x014
#define HISI_GPIO_SWPORT_DDR_ST_WX 0x018
#define HISI_GPIO_INTEN_SET_WX 0x020
#define HISI_GPIO_INTEN_CLR_WX 0x024
#define HISI_GPIO_INTMASK_SET_WX 0x030
#define HISI_GPIO_INTMASK_CLR_WX 0x034
#define HISI_GPIO_INTTYPE_EDGE_SET_WX 0x040
#define HISI_GPIO_INTTYPE_EDGE_CLR_WX 0x044
#define HISI_GPIO_INT_POLARITY_SET_WX 0x050
#define HISI_GPIO_INT_POLARITY_CLR_WX 0x054
#define HISI_GPIO_DEBOUNCE_SET_WX 0x060
#define HISI_GPIO_DEBOUNCE_CLR_WX 0x064
#define HISI_GPIO_INTSTATUS_WX 0x070
#define HISI_GPIO_PORTA_EOI_WX 0x078
#define HISI_GPIO_EXT_PORT_WX 0x080
#define HISI_GPIO_INTCOMB_MASK_WX 0x0a0
#define HISI_GPIO_INT_DEDGE_SET 0x0b0
#define HISI_GPIO_INT_DEDGE_CLR 0x0b4
#define HISI_GPIO_INT_DEDGE_ST 0x0b8
#define HISI_GPIO_LINE_NUM_MAX 32
#define HISI_GPIO_DRIVER_NAME "gpio-hisi"
struct hisi_gpio {
struct gpio_chip chip;
struct device *dev;
void __iomem *reg_base;
unsigned int line_num;
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);
void __iomem *reg = hisi_gpio->reg_base + off;
return readl(reg);
}
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);
void __iomem *reg = hisi_gpio->reg_base + off;
writel(val, reg);
}
static void hisi_gpio_set_debounce(struct gpio_chip *chip, unsigned int off,
u32 debounce)
{
if (debounce)
hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_SET_WX, BIT(off));
else
hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_CLR_WX, BIT(off));
}
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 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);
break;
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);
unsigned long irq_msk = hisi_gpio_read_reg(&hisi_gpio->chip,
HISI_GPIO_INTSTATUS_WX);
struct irq_chip *irq_c = irq_desc_get_chip(desc);
int hwirq;
chained_irq_enter(irq_c, desc);
for_each_set_bit(hwirq, &irq_msk, HISI_GPIO_LINE_NUM_MAX)
generic_handle_irq(irq_find_mapping(hisi_gpio->chip.irq.domain,
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) {
/* Cycle for once, no need for an array to save line_num */
if (fwnode_property_read_u32(fwnode, "ngpios",
&hisi_gpio->line_num)) {
dev_err(dev,
"failed to get number of lines for port%d and use default value instead\n",
idx);
hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;
}
if (WARN_ON(hisi_gpio->line_num > HISI_GPIO_LINE_NUM_MAX))
hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;
hisi_gpio->irq = platform_get_irq(pdev, idx);
dev_info(dev,
"get hisi_gpio[%d] with %d lines\n", idx,
hisi_gpio->line_num);
idx++;
}
}
static int hisi_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hisi_gpio *hisi_gpio;
int port_num;
int ret;
/*
* One GPIO controller own one port currently,
* if we get more from ACPI table, return error.
*/
port_num = device_get_child_node_count(dev);
if (WARN_ON(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(pdev, 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;
ret = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, 0x4,
hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX,
hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX,
hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX,
hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_SET_WX,
hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_CLR_WX,
BGPIOF_NO_SET_ON_INPUT);
if (ret) {
dev_err(dev, "failed to init, ret = %d\n", ret);
return ret;
}
hisi_gpio->chip.set_config = hisi_gpio_set_config;
hisi_gpio->chip.ngpio = hisi_gpio->line_num;
hisi_gpio->chip.bgpio_dir_unreadable = 1;
hisi_gpio->chip.base = -1;
if (hisi_gpio->irq > 0)
hisi_gpio_init_irq(hisi_gpio);
ret = devm_gpiochip_add_data(dev, &hisi_gpio->chip, hisi_gpio);
if (ret) {
dev_err(dev, "failed to register gpiochip, ret = %d\n", ret);
return ret;
}
return 0;
}
static struct platform_driver hisi_gpio_driver = {
.driver = {
.name = HISI_GPIO_DRIVER_NAME,
.acpi_match_table = hisi_gpio_acpi_match,
},
.probe = hisi_gpio_probe,
};
module_platform_driver(hisi_gpio_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Luo Jiaxing <luojiaxing@huawei.com>");
MODULE_DESCRIPTION("HiSilicon GPIO controller driver");
MODULE_ALIAS("platform:" HISI_GPIO_DRIVER_NAME);
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