This driver enables configuration of GPIO direction, GPIO values, GPIO
debounce settings and handles GPIO interrupts.
Signed-off-by: Tzuyi Chang <tychang@xxxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
v4 to v5 change:
1. Add comment for the counter-intuitive number 31.
2. Convert to use cleanup API.
3. Convert to use module_platform_driver() macro.
4. Simplify some of the code as suggested in patch v4.
5. Add more description in the Kconfig.
v3 to v4 change:
1. Remove the size check for the offset array.
2. Add the debounce callback to get values, register offsets and shifts for each chip.
3. Conducted a review of the critical section, employing raw_spinlock_t for locking purposes.
4. Use irqd_to_hwirq to get hwirq.
5. Add gpiochip_enable_irq/gpiochip_disable_irq to fulfill the immutability requirements.
v2 to v3 change:
1. Remove generic compatible and use SoC-specific compatible instead.
2. Add the missing descriptions for the rtd_gpio_info structure members.
3. Assign gpio_chip fwnode.
v1 to v2 change:
1. Remove legacy headers.
2. Transitioned from OF API to platform_device API.
3. Use u8 for the offset member within the rtd_gpio_info structure.
4. Record the size of each array within the rtd_gpio_info structure and
implement checks to prevent out-of-bounds access.
5. Use GPIOLIB_IRQCHIP helpers to register interrupts.
6. Use dynamic allocation for GPIO base.
---
drivers/gpio/Kconfig | 13 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-rtd.c | 604 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 618 insertions(+)
create mode 100644 drivers/gpio/gpio-rtd.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b3a133ed31ee..4c6bae8dc789 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -553,6 +553,19 @@ config GPIO_ROCKCHIP
help
Say yes here to support GPIO on Rockchip SoCs.
+config GPIO_RTD
+ tristate "Realtek DHC GPIO support"
+ depends on ARCH_REALTEK
+ default y
+ select GPIOLIB_IRQCHIP
+ help
+ This option enables support for GPIOs found on Realtek DHC(Digital
+ Home Center) SoCs family, including RTD1295, RTD1315E, RTD1319,
+ RTD1319D, RTD1395, RTD1619 and RTD1619B.
+
+ Say yes here to support GPIO functionality and GPIO interrupt on
+ Realtek DHC SoCs.
+
config GPIO_SAMA5D2_PIOBU
tristate "SAMA5D2 PIOBU GPIO support"
depends on MFD_SYSCON
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index eb73b5d633eb..16bb40717e87 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -137,6 +137,7 @@ obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
obj-$(CONFIG_GPIO_REALTEK_OTTO) += gpio-realtek-otto.o
obj-$(CONFIG_GPIO_REG) += gpio-reg.o
obj-$(CONFIG_GPIO_ROCKCHIP) += gpio-rockchip.o
+obj-$(CONFIG_GPIO_RTD) += gpio-rtd.o
obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o
obj-$(CONFIG_GPIO_SAMA5D2_PIOBU) += gpio-sama5d2-piobu.o
obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o
diff --git a/drivers/gpio/gpio-rtd.c b/drivers/gpio/gpio-rtd.c
new file mode 100644
index 000000000000..a7939bd0aa56
--- /dev/null
+++ b/drivers/gpio/gpio-rtd.c
@@ -0,0 +1,604 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Realtek DHC gpio driver
+ *
+ * Copyright (c) 2023 Realtek Semiconductor Corp.
+ */
+
+#include <linux/bitops.h>
+#include <linux/cleanup.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define RTD_GPIO_DEBOUNCE_1US 0
+#define RTD_GPIO_DEBOUNCE_10US 1
+#define RTD_GPIO_DEBOUNCE_100US 2
+#define RTD_GPIO_DEBOUNCE_1MS 3
+#define RTD_GPIO_DEBOUNCE_10MS 4
+#define RTD_GPIO_DEBOUNCE_20MS 5
+#define RTD_GPIO_DEBOUNCE_30MS 6
+
+/**
+ * struct rtd_gpio_info - Specific GPIO register information
+ * @name: GPIO device name
+ * @gpio_base: GPIO base number
+ * @num_gpios: The number of GPIOs
+ * @dir_offset: Offset for GPIO direction registers
+ * @dato_offset: Offset for GPIO data output registers
+ * @dati_offset: Offset for GPIO data input registers
+ * @ie_offset: Offset for GPIO interrupt enable registers
+ * @dp_offset: Offset for GPIO detection polarity registers
+ * @gpa_offset: Offset for GPIO assert interrupt status registers
+ * @gpda_offset: Offset for GPIO deassert interrupt status registers
+ * @deb_offset: Offset for GPIO debounce registers
+ * @deb_val: Register values representing the GPIO debounce time
+ * @get_deb_setval: Used to get the corresponding value for setting the debounce register
+ */
+struct rtd_gpio_info {
+ const char *name;
+ unsigned int gpio_base;
+ unsigned int num_gpios;
+ u8 *dir_offset;
+ u8 *dato_offset;
+ u8 *dati_offset;
+ u8 *ie_offset;
+ u8 *dp_offset;
+ u8 *gpa_offset;
+ u8 *gpda_offset;
+ u8 *deb_offset;
+ u8 *deb_val;
+ u8 (*get_deb_setval)(const struct rtd_gpio_info *info,
+ unsigned int offset, u8 deb_index,
+ u8 *reg_offset, u8 *shift);
+};
+
+struct rtd_gpio {
+ struct gpio_chip gpio_chip;
+ const struct rtd_gpio_info *info;
+ void __iomem *base;
+ void __iomem *irq_base;
+ unsigned int irqs[2];
+ raw_spinlock_t lock;
+};
+
+static u8 rtd_gpio_get_deb_setval(const struct rtd_gpio_info *info, unsigned int offset,
+ u8 deb_index, u8 *reg_offset, u8 *shift)
+{
+ *reg_offset = info->deb_offset[offset / 8];
+ *shift = (offset % 8) * 4;
+ return info->deb_val[deb_index];
+}
+
+static u8 rtd1295_misc_gpio_get_deb_setval(const struct rtd_gpio_info *info, unsigned int offset,
+ u8 deb_index, u8 *reg_offset, u8 *shift)
+{
+ *reg_offset = info->deb_offset[0];
+ *shift = (offset % 8) * 4;
+ return info->deb_val[deb_index];
+}
+
+static u8 rtd1295_iso_gpio_get_deb_setval(const struct rtd_gpio_info *info, unsigned int offset,
+ u8 deb_index, u8 *reg_offset, u8 *shift)
+{
+ *reg_offset = info->deb_offset[0];
+ *shift = 0;
+ return info->deb_val[deb_index];
+}
+
+static const struct rtd_gpio_info rtd_iso_gpio_info = {
+ .name = "rtd_iso_gpio",
+ .gpio_base = 0,
+ .num_gpios = 82,
+ .dir_offset = (u8 []){ 0x0, 0x18, 0x2c },
+ .dato_offset = (u8 []){ 0x4, 0x1c, 0x30 },
+ .dati_offset = (u8 []){ 0x8, 0x20, 0x34 },
+ .ie_offset = (u8 []){ 0xc, 0x24, 0x38 },
+ .dp_offset = (u8 []){ 0x10, 0x28, 0x3c },
+ .gpa_offset = (u8 []){ 0x8, 0xe0, 0x90 },
+ .gpda_offset = (u8 []){ 0xc, 0xe4, 0x94 },
+ .deb_offset = (u8 []){ 0x44, 0x48, 0x4c, 0x50, 0x54, 0x58, 0x5c,
+ 0x60, 0x64, 0x68, 0x6c },
+ .deb_val = (u8 []){ 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6 },
+ .get_deb_setval = rtd_gpio_get_deb_setval,
+};
+
+static const struct rtd_gpio_info rtd1619_iso_gpio_info = {
+ .name = "rtd1619_iso_gpio",
+ .gpio_base = 0,
+ .num_gpios = 86,
+ .dir_offset = (u8 []){ 0x0, 0x18, 0x2c },
+ .dato_offset = (u8 []){ 0x4, 0x1c, 0x30 },
+ .dati_offset = (u8 []){ 0x8, 0x20, 0x34 },
+ .ie_offset = (u8 []){ 0xc, 0x24, 0x38 },
+ .dp_offset = (u8 []){ 0x10, 0x28, 0x3c },
+ .gpa_offset = (u8 []){ 0x8, 0xe0, 0x90 },
+ .gpda_offset = (u8 []){ 0xc, 0xe4, 0x94 },
+ .deb_offset = (u8 []){ 0x44, 0x48, 0x4c, 0x50, 0x54, 0x58, 0x5c,
+ 0x60, 0x64, 0x68, 0x6c },
+ .deb_val = (u8 []){ 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6 },
+ .get_deb_setval = rtd_gpio_get_deb_setval,
+};
+
+static const struct rtd_gpio_info rtd1395_iso_gpio_info = {
+ .name = "rtd1395_iso_gpio",
+ .gpio_base = 0,
+ .num_gpios = 57,
+ .dir_offset = (u8 []){ 0x0, 0x18 },
+ .dato_offset = (u8 []){ 0x4, 0x1c },
+ .dati_offset = (u8 []){ 0x8, 0x20 },
+ .ie_offset = (u8 []){ 0xc, 0x24 },
+ .dp_offset = (u8 []){ 0x10, 0x28 },
+ .gpa_offset = (u8 []){ 0x8, 0xe0 },
+ .gpda_offset = (u8 []){ 0xc, 0xe4 },
+ .deb_offset = (u8 []){ 0x30, 0x34, 0x38, 0x3c, 0x40, 0x44, 0x48, 0x4c },
+ .deb_val = (u8 []){ 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6 },
+ .get_deb_setval = rtd_gpio_get_deb_setval,
+};
+
+static const struct rtd_gpio_info rtd1295_misc_gpio_info = {
+ .name = "rtd1295_misc_gpio",
+ .gpio_base = 0,
+ .num_gpios = 101,
+ .dir_offset = (u8 []){ 0x0, 0x4, 0x8, 0xc },
+ .dato_offset = (u8 []){ 0x10, 0x14, 0x18, 0x1c },
+ .dati_offset = (u8 []){ 0x20, 0x24, 0x28, 0x2c },
+ .ie_offset = (u8 []){ 0x30, 0x34, 0x38, 0x3c },
+ .dp_offset = (u8 []){ 0x40, 0x44, 0x48, 0x4c },
+ .gpa_offset = (u8 []){ 0x40, 0x44, 0xa4, 0xb8 },
+ .gpda_offset = (u8 []){ 0x54, 0x58, 0xa8, 0xbc},
+ .deb_offset = (u8 []){ 0x50 },
+ .deb_val = (u8 []){ 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 },
+ .get_deb_setval = rtd1295_misc_gpio_get_deb_setval,
+};
+
+static const struct rtd_gpio_info rtd1295_iso_gpio_info = {
+ .name = "rtd1295_iso_gpio",
+ .gpio_base = 101,
+ .num_gpios = 35,
+ .dir_offset = (u8 []){ 0x0, 0x18 },
+ .dato_offset = (u8 []){ 0x4, 0x1c },
+ .dati_offset = (u8 []){ 0x8, 0x20 },
+ .ie_offset = (u8 []){ 0xc, 0x24 },
+ .dp_offset = (u8 []){ 0x10, 0x28 },
+ .gpa_offset = (u8 []){ 0x8, 0xe0 },
+ .gpda_offset = (u8 []){ 0xc, 0xe4 },
+ .deb_offset = (u8 []){ 0x14 },
+ .deb_val = (u8 []){ 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 },
+ .get_deb_setval = rtd1295_iso_gpio_get_deb_setval,
+};
+
+static int rtd_gpio_dir_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ return data->info->dir_offset[offset / 32];
+}
+
+static int rtd_gpio_dato_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ return data->info->dato_offset[offset / 32];
+}
+
+static int rtd_gpio_dati_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ return data->info->dati_offset[offset / 32];
+}
+
+static int rtd_gpio_ie_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ return data->info->ie_offset[offset / 32];
+}
+
+static int rtd_gpio_dp_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ return data->info->dp_offset[offset / 32];
+}
+
+
+static int rtd_gpio_gpa_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ /* Each GPIO assert interrupt status register contains 31 GPIOs. */
+ return data->info->gpa_offset[offset / 31];
+}
+
+static int rtd_gpio_gpda_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ /* Each GPIO deassert interrupt status register contains 31 GPIOs. */
+ return data->info->gpda_offset[offset / 31];
+}
+
+static int rtd_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
+ unsigned int debounce)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ u8 deb_val, deb_index, reg_offset, shift;
+ unsigned int write_en;
+ u32 val;
+
+ switch (debounce) {
+ case 1:
+ deb_index = RTD_GPIO_DEBOUNCE_1US;
+ break;
+ case 10:
+ deb_index = RTD_GPIO_DEBOUNCE_10US;
+ break;
+ case 100:
+ deb_index = RTD_GPIO_DEBOUNCE_100US;
+ break;
+ case 1000:
+ deb_index = RTD_GPIO_DEBOUNCE_1MS;
+ break;
+ case 10000:
+ deb_index = RTD_GPIO_DEBOUNCE_10MS;
+ break;
+ case 20000:
+ deb_index = RTD_GPIO_DEBOUNCE_20MS;
+ break;
+ case 30000:
+ deb_index = RTD_GPIO_DEBOUNCE_30MS;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ deb_val = data->info->get_deb_setval(data->info, offset, deb_index, ®_offset, &shift);
+ write_en = BIT(shift + 3);
+ val = (deb_val << shift) | write_en;
+
+ guard(raw_spinlock_irqsave)(&data->lock);
+ writel_relaxed(val, data->base + reg_offset);
+
+ return 0;
+}
+
+static int rtd_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+ unsigned long config)
+{
+ int debounce;
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ case PIN_CONFIG_BIAS_PULL_UP:
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ return gpiochip_generic_config(chip, offset, config);
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ debounce = pinconf_to_config_argument(config);
+ return rtd_gpio_set_debounce(chip, offset, debounce);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static void rtd_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ u32 mask = BIT(offset % 32);
+ int dato_reg_offset;
+ u32 val;
+
+ dato_reg_offset = rtd_gpio_dato_offset(data, offset);
+
+ guard(raw_spinlock_irqsave)(&data->lock);
+
+ val = readl_relaxed(data->base + dato_reg_offset);
+ if (value)
+ val |= mask;
+ else
+ val &= ~mask;
+ writel_relaxed(val, data->base + dato_reg_offset);
+}
+
+static int rtd_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ int dato_reg_offset = rtd_gpio_dato_offset(data, offset);
+ int dati_reg_offset = rtd_gpio_dati_offset(data, offset);
+ int dir_reg_offset = rtd_gpio_dir_offset(data, offset);
+ int dat_reg_offset;
+ u32 val;
+
+ guard(raw_spinlock_irqsave)(&data->lock);
+
+ val = readl_relaxed(data->base + dir_reg_offset);
+ dat_reg_offset = (val & BIT(offset % 32)) ? dato_reg_offset : dati_reg_offset;
+ val = readl_relaxed(data->base + dat_reg_offset);
+
+ return !!(val & BIT(offset % 32));
+}
+
+static int rtd_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ int reg_offset;
+ u32 val;
+
+ reg_offset = rtd_gpio_dir_offset(data, offset);
+ val = readl_relaxed(data->base + reg_offset);
+ if (val & BIT(offset % 32))
+ return GPIO_LINE_DIRECTION_OUT;
+
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int rtd_gpio_set_direction(struct gpio_chip *chip, unsigned int offset, bool out)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ u32 mask = BIT(offset % 32);
+ int reg_offset;
+ u32 val;
+
+ reg_offset = rtd_gpio_dir_offset(data, offset);
+
+ guard(raw_spinlock_irqsave)(&data->lock);
+
+ val = readl_relaxed(data->base + reg_offset);
+ if (out)
+ val |= mask;
+ else
+ val &= ~mask;
+ writel_relaxed(val, data->base + reg_offset);
+
+ return 0;
+}
+
+static int rtd_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+ return rtd_gpio_set_direction(chip, offset, false);
+}
+
+static int rtd_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ rtd_gpio_set(chip, offset, value);
+
+ return rtd_gpio_set_direction(chip, offset, true);
+}
+
+static bool rtd_gpio_check_ie(struct rtd_gpio *data, int irq)
+{
+ int mask = BIT(irq % 32);
+ int ie_reg_offset;
+ u32 enable;
+
+ ie_reg_offset = rtd_gpio_ie_offset(data, irq);
+ enable = readl_relaxed(data->base + ie_reg_offset);
+
+ return enable & mask;
+}
+
+static void rtd_gpio_irq_handle(struct irq_desc *desc)
+{
+ int (*get_reg_offset)(struct rtd_gpio *gpio, unsigned int offset);
+ struct rtd_gpio *data = irq_desc_get_handler_data(desc);
+ struct irq_domain *domain = data->gpio_chip.irq.domain;
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned int irq = irq_desc_get_irq(desc);
+ unsigned long status;
+ int reg_offset, i, j;
+ unsigned int hwirq;
+
+ if (irq == data->irqs[0])
+ get_reg_offset = &rtd_gpio_gpa_offset;
+ else if (irq == data->irqs[1])
+ get_reg_offset = &rtd_gpio_gpda_offset;
+
+ chained_irq_enter(chip, desc);
+
+ /* Each GPIO interrupt status register contains 31 GPIOs. */
+ for (i = 0; i < data->info->num_gpios; i += 31) {
+ reg_offset = get_reg_offset(data, i);
+
+ /*
+ * Bit 0 is the write_en bit, bit 0 to 31 corresponds to 31 GPIOs.
+ * When bit 0 is set to 0, write 1 to the other bits to clear the status.
+ * When bit 0 is set to 1, write 1 to the other bits to set the status.
+ */
+ status = readl_relaxed(data->irq_base + reg_offset);
+ status &= ~BIT(0);
+ writel_relaxed(status, data->irq_base + reg_offset);
+
+ for_each_set_bit(j, &status, 32) {
+ hwirq = i + j - 1;
+ if (rtd_gpio_check_ie(data, hwirq)) {
+ int girq = irq_find_mapping(domain, hwirq);
+ u32 irq_type = irq_get_trigger_type(girq);
+
+ if ((irq == data->irqs[1]) && (irq_type != IRQ_TYPE_EDGE_BOTH))
+ break;
+ generic_handle_domain_irq(domain, hwirq);
+ }
+ }
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void rtd_gpio_enable_irq(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct rtd_gpio *data = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ /* Bit 0 is write_en and bit 1 to 31 is correspond to 31 GPIOs. */
+ u32 clr_mask = BIT(hwirq % 31) << 1;
+
+ u32 ie_mask = BIT(hwirq % 32);
+ int gpda_reg_offset;
+ int gpa_reg_offset;
+ int ie_reg_offset;
+ u32 val;
+
+ ie_reg_offset = rtd_gpio_ie_offset(data, hwirq);
+ gpa_reg_offset = rtd_gpio_gpa_offset(data, hwirq);
+ gpda_reg_offset = rtd_gpio_gpda_offset(data, hwirq);
+
+ gpiochip_enable_irq(gc, hwirq);
+
+ guard(raw_spinlock_irqsave)(&data->lock);
+
+ writel_relaxed(clr_mask, data->irq_base + gpa_reg_offset);
+ writel_relaxed(clr_mask, data->irq_base + gpda_reg_offset);
+
+ val = readl_relaxed(data->base + ie_reg_offset);
+ val |= ie_mask;
+ writel_relaxed(val, data->base + ie_reg_offset);
+}
+
+static void rtd_gpio_disable_irq(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct rtd_gpio *data = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ u32 ie_mask = BIT(hwirq % 32);
+ int ie_reg_offset;
+ u32 val;
+
+ ie_reg_offset = rtd_gpio_ie_offset(data, hwirq);
+
+ scoped_guard(raw_spinlock_irqsave, &data->lock) {
+ val = readl_relaxed(data->base + ie_reg_offset);
+ val &= ~ie_mask;
+ writel_relaxed(val, data->base + ie_reg_offset);
+ }
+
+ gpiochip_disable_irq(gc, hwirq);
+}
+
+static int rtd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct rtd_gpio *data = gpiochip_get_data(gc);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+ u32 mask = BIT(hwirq % 32);
+ int dp_reg_offset;
+ bool polarity;
+ u32 val;
+
+ dp_reg_offset = rtd_gpio_dp_offset(data, hwirq);
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ polarity = 1;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ polarity = 0;
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ polarity = 1;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ scoped_guard(raw_spinlock_irqsave, &data->lock) {
+ val = readl_relaxed(data->base + dp_reg_offset);
+ if (polarity)
+ val |= mask;
+ else
+ val &= ~mask;
+ writel_relaxed(val, data->base + dp_reg_offset);
+ }
+
+ irq_set_handler_locked(d, handle_simple_irq);
+
+ return 0;
+}
+
+static const struct irq_chip rtd_gpio_irq_chip = {
+ .name = "rtd-gpio",
+ .irq_enable = rtd_gpio_enable_irq,
+ .irq_disable = rtd_gpio_disable_irq,
+ .irq_set_type = rtd_gpio_irq_set_type,
+ .flags = IRQCHIP_IMMUTABLE,
+};
+
+static int rtd_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct gpio_irq_chip *irq_chip;
+ struct rtd_gpio *data;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->irqs[0] = platform_get_irq(pdev, 0);
+ if (data->irqs[0] < 0)
+ return data->irqs[0];
+
+ data->irqs[1] = platform_get_irq(pdev, 1);
+ if (data->irqs[1] < 0)
+ return data->irqs[1];
+
+ data->info = device_get_match_data(dev);
+ if (!data->info)
+ return -EINVAL;
+
+ raw_spin_lock_init(&data->lock);
+
+ data->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(data->base))
+ return PTR_ERR(data->base);
+
+ data->irq_base = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(data->irq_base))
+ return PTR_ERR(data->irq_base);
+
+ data->gpio_chip.label = dev_name(dev);
+ data->gpio_chip.base = -1;
+ data->gpio_chip.ngpio = data->info->num_gpios;
+ data->gpio_chip.request = gpiochip_generic_request;
+ data->gpio_chip.free = gpiochip_generic_free;
+ data->gpio_chip.get_direction = rtd_gpio_get_direction;
+ data->gpio_chip.direction_input = rtd_gpio_direction_input;
+ data->gpio_chip.direction_output = rtd_gpio_direction_output;
+ data->gpio_chip.set = rtd_gpio_set;
+ data->gpio_chip.get = rtd_gpio_get;
+ data->gpio_chip.set_config = rtd_gpio_set_config;
+ data->gpio_chip.parent = dev;
+
+ irq_chip = &data->gpio_chip.irq;
+ irq_chip->handler = handle_bad_irq;
+ irq_chip->default_type = IRQ_TYPE_NONE;
+ irq_chip->parent_handler = rtd_gpio_irq_handle;
+ irq_chip->parent_handler_data = data;
+ irq_chip->num_parents = 2;
+ irq_chip->parents = data->irqs;
+
+ gpio_irq_chip_set_chip(irq_chip, &rtd_gpio_irq_chip);
+
+ return devm_gpiochip_add_data(dev, &data->gpio_chip, data);
+}
+
+static const struct of_device_id rtd_gpio_of_matches[] = {
+ { .compatible = "realtek,rtd1295-misc-gpio", .data = &rtd1295_misc_gpio_info },
+ { .compatible = "realtek,rtd1295-iso-gpio", .data = &rtd1295_iso_gpio_info },
+ { .compatible = "realtek,rtd1395-iso-gpio", .data = &rtd1395_iso_gpio_info },
+ { .compatible = "realtek,rtd1619-iso-gpio", .data = &rtd1619_iso_gpio_info },
+ { .compatible = "realtek,rtd1319-iso-gpio", .data = &rtd_iso_gpio_info },
+ { .compatible = "realtek,rtd1619b-iso-gpio", .data = &rtd_iso_gpio_info },
+ { .compatible = "realtek,rtd1319d-iso-gpio", .data = &rtd_iso_gpio_info },
+ { .compatible = "realtek,rtd1315e-iso-gpio", .data = &rtd_iso_gpio_info },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rtd_gpio_of_matches);
+
+static struct platform_driver rtd_gpio_platform_driver = {
+ .driver = {
+ .name = "gpio-rtd",
+ .of_match_table = rtd_gpio_of_matches,
+ },
+ .probe = rtd_gpio_probe,
+};
+module_platform_driver(rtd_gpio_platform_driver);
+
+MODULE_DESCRIPTION("Realtek DHC SoC gpio driver");
+MODULE_LICENSE("GPL v2");
--
2.43.0
