This driver enables configuration of GPIO direction, GPIO values, GPIO
debounce settings and handles GPIO interrupts.
Signed-off-by: Tzuyi Chang <tychang@xxxxxxxxxxx>
---
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 | 9 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-rtd.c | 736 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 746 insertions(+)
create mode 100644 drivers/gpio/gpio-rtd.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b3a133ed31ee..f0bdf9dbdefc 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -553,6 +553,15 @@ 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
+ Say yes here to support GPIO on Realtek DHC(Digital Home Center)
+ 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..b0dee7b6177c
--- /dev/null
+++ b/drivers/gpio/gpio-rtd.c
@@ -0,0 +1,736 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Realtek DHC gpio driver
+ *
+ * Copyright (c) 2023 Realtek Semiconductor Corp.
+ */
+
+#include <linux/bitops.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>
+
+#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
+
+enum rtd_gpio_type {
+ RTD_ISO_GPIO = 0,
+ RTD1295_ISO_GPIO,
+ RTD1295_MISC_GPIO,
+ RTD1395_ISO_GPIO,
+ RTD1619_ISO_GPIO,
+};
+
+/**
+ * struct rtd_gpio_info - Specific GPIO register information
+ * @name: GPIO device name
+ * @type: RTD GPIO ID
+ * @gpio_base: GPIO base number
+ * @num_gpios: 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
+ */
+struct rtd_gpio_info {
+ const char *name;
+ enum rtd_gpio_type type;
+ unsigned int gpio_base;
+ unsigned int num_gpios;
+ u8 *dir_offset;
+ u8 num_dir;
+ u8 *dato_offset;
+ u8 num_dato;
+ u8 *dati_offset;
+ u8 num_dati;
+ u8 *ie_offset;
+ u8 num_ie;
+ u8 *dp_offset;
+ u8 num_dp;
+ u8 *gpa_offset;
+ u8 num_gpa;
+ u8 *gpda_offset;
+ u8 num_gpda;
+ u8 *deb_offset;
+ u8 num_deb;
+};
+
+struct rtd_gpio {
+ struct platform_device *pdev;
+ const struct rtd_gpio_info *info;
+ void __iomem *base;
+ void __iomem *irq_base;
+ struct gpio_chip gpio_chip;
+ unsigned int irqs[2];
+ spinlock_t lock;
+};
+
+
+static const struct rtd_gpio_info rtd_iso_gpio_info = {
+ .name = "rtd_iso_gpio",
+ .type = RTD_ISO_GPIO,
+ .gpio_base = 0,
+ .num_gpios = 82,
+ .dir_offset = (u8 []){ 0x0, 0x18, 0x2c },
+ .num_dir = 3,
+ .dato_offset = (u8 []){ 0x4, 0x1c, 0x30 },
+ .num_dato = 3,
+ .dati_offset = (u8 []){ 0x8, 0x20, 0x34 },
+ .num_dati = 3,
+ .ie_offset = (u8 []){ 0xc, 0x24, 0x38 },
+ .num_ie = 3,
+ .dp_offset = (u8 []){ 0x10, 0x28, 0x3c },
+ .num_dp = 3,
+ .gpa_offset = (u8 []){ 0x8, 0xe0, 0x90 },
+ .num_gpa = 3,
+ .gpda_offset = (u8 []){ 0xc, 0xe4, 0x94 },
+ .num_gpda = 3,
+ .deb_offset = (u8 []){ 0x44, 0x48, 0x4c, 0x50, 0x54, 0x58, 0x5c,
+ 0x60, 0x64, 0x68, 0x6c },
+ .num_deb = 11,
+};
+
+static const struct rtd_gpio_info rtd1619_iso_gpio_info = {
+ .name = "rtd1619_iso_gpio",
+ .type = RTD1619_ISO_GPIO,
+ .gpio_base = 0,
+ .num_gpios = 86,
+ .dir_offset = (u8 []){ 0x0, 0x18, 0x2c },
+ .num_dir = 3,
+ .dato_offset = (u8 []){ 0x4, 0x1c, 0x30 },
+ .num_dato = 3,
+ .dati_offset = (u8 []){ 0x8, 0x20, 0x34 },
+ .num_dati = 3,
+ .ie_offset = (u8 []){ 0xc, 0x24, 0x38 },
+ .num_ie = 3,
+ .dp_offset = (u8 []){ 0x10, 0x28, 0x3c },
+ .num_dp = 3,
+ .gpa_offset = (u8 []){ 0x8, 0xe0, 0x90 },
+ .num_gpa = 3,
+ .gpda_offset = (u8 []){ 0xc, 0xe4, 0x94 },
+ .num_gpda = 3,
+ .deb_offset = (u8 []){ 0x44, 0x48, 0x4c, 0x50, 0x54, 0x58, 0x5c,
+ 0x60, 0x64, 0x68, 0x6c },
+ .num_deb = 11,
+};
+
+static const struct rtd_gpio_info rtd1395_iso_gpio_info = {
+ .name = "rtd1395_iso_gpio",
+ .type = RTD1395_ISO_GPIO,
+ .gpio_base = 0,
+ .num_gpios = 57,
+ .dir_offset = (u8 []){ 0x0, 0x18 },
+ .num_dir = 2,
+ .dato_offset = (u8 []){ 0x4, 0x1c },
+ .num_dato = 2,
+ .dati_offset = (u8 []){ 0x8, 0x20 },
+ .num_dati = 2,
+ .ie_offset = (u8 []){ 0xc, 0x24 },
+ .num_ie = 2,
+ .dp_offset = (u8 []){ 0x10, 0x28 },
+ .num_dp = 2,
+ .gpa_offset = (u8 []){ 0x8, 0xe0 },
+ .num_gpa = 2,
+ .gpda_offset = (u8 []){ 0xc, 0xe4 },
+ .num_gpda = 2,
+ .deb_offset = (u8 []){ 0x30, 0x34, 0x38, 0x3c, 0x40, 0x44, 0x48, 0x4c },
+ .num_deb = 8,
+};
+
+static const struct rtd_gpio_info rtd1295_misc_gpio_info = {
+ .name = "rtd1295_misc_gpio",
+ .type = RTD1295_ISO_GPIO,
+ .gpio_base = 0,
+ .num_gpios = 101,
+ .dir_offset = (u8 []){ 0x0, 0x4, 0x8, 0xc },
+ .num_dir = 4,
+ .dato_offset = (u8 []){ 0x10, 0x14, 0x18, 0x1c },
+ .num_dato = 4,
+ .dati_offset = (u8 []){ 0x20, 0x24, 0x28, 0x2c },
+ .num_dati = 4,
+ .ie_offset = (u8 []){ 0x30, 0x34, 0x38, 0x3c },
+ .num_ie = 4,
+ .dp_offset = (u8 []){ 0x40, 0x44, 0x48, 0x4c },
+ .num_dp = 4,
+ .gpa_offset = (u8 []){ 0x40, 0x44, 0xa4, 0xb8 },
+ .num_gpa = 4,
+ .gpda_offset = (u8 []){ 0x54, 0x58, 0xa8, 0xbc},
+ .num_gpda = 4,
+ .deb_offset = (u8 []){ 0x50 },
+ .num_deb = 1,
+};
+
+static const struct rtd_gpio_info rtd1295_iso_gpio_info = {
+ .name = "rtd1295_iso_gpio",
+ .type = RTD1295_ISO_GPIO,
+ .gpio_base = 101,
+ .num_gpios = 35,
+ .dir_offset = (u8 []){ 0x0, 0x18 },
+ .num_dir = 2,
+ .dato_offset = (u8 []){ 0x4, 0x1c },
+ .num_dato = 2,
+ .dati_offset = (u8 []){ 0x8, 0x20 },
+ .num_dati = 2,
+ .ie_offset = (u8 []){ 0xc, 0x24 },
+ .num_ie = 2,
+ .dp_offset = (u8 []){ 0x10, 0x28 },
+ .num_dp = 2,
+ .gpa_offset = (u8 []){ 0x8, 0xe0 },
+ .num_gpa = 2,
+ .gpda_offset = (u8 []){ 0xc, 0xe4 },
+ .num_gpda = 2,
+ .deb_offset = (u8 []){ 0x14 },
+ .num_deb = 1,
+};
+
+static int rtd_gpio_dir_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 32;
+
+ if (index > data->info->num_dir)
+ return -EINVAL;
+
+ return data->info->dir_offset[index];
+}
+
+static int rtd_gpio_dato_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 32;
+
+ if (index > data->info->num_dato)
+ return -EINVAL;
+
+ return data->info->dato_offset[index];
+}
+
+static int rtd_gpio_dati_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 32;
+
+ if (index > data->info->num_dati)
+ return -EINVAL;
+
+ return data->info->dati_offset[index];
+}
+
+static int rtd_gpio_ie_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 32;
+
+ if (index > data->info->num_ie)
+ return -EINVAL;
+
+ return data->info->ie_offset[index];
+}
+
+static int rtd_gpio_dp_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 32;
+
+ if (index > data->info->num_dp)
+ return -EINVAL;
+
+ return data->info->dp_offset[index];
+}
+
+static int rtd_gpio_gpa_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 31;
+
+ if (index > data->info->num_gpa)
+ return -EINVAL;
+
+ return data->info->gpa_offset[index];
+}
+
+static int rtd_gpio_gpda_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 31;
+
+ if (index > data->info->num_gpda)
+ return -EINVAL;
+
+ return data->info->gpda_offset[index];
+}
+
+static int rtd_gpio_deb_offset(struct rtd_gpio *data, unsigned int offset)
+{
+ int index = offset / 8;
+
+ if (index > data->info->num_deb)
+ return -EINVAL;
+
+ return data->info->deb_offset[index];
+}
+
+static int rtd_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
+ unsigned int debounce)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ unsigned int write_en;
+ unsigned long flags;
+ unsigned int shift;
+ int reg_offset;
+ u32 deb_val;
+ u32 val;
+
+ switch (debounce) {
+ case 1:
+ deb_val = RTD_GPIO_DEBOUNCE_1US;
+ break;
+ case 10:
+ deb_val = RTD_GPIO_DEBOUNCE_10US;
+ break;
+ case 100:
+ deb_val = RTD_GPIO_DEBOUNCE_100US;
+ break;
+ case 1000:
+ deb_val = RTD_GPIO_DEBOUNCE_1MS;
+ break;
+ case 10000:
+ deb_val = RTD_GPIO_DEBOUNCE_10MS;
+ break;
+ case 20000:
+ deb_val = RTD_GPIO_DEBOUNCE_20MS;
+ break;
+ case 30000:
+ deb_val = RTD_GPIO_DEBOUNCE_30MS;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (data->info->type == RTD1295_ISO_GPIO) {
+ reg_offset = rtd_gpio_deb_offset(data, 0);
+ if (reg_offset < 0)
+ return reg_offset;
+ shift = 0;
+ deb_val += 1;
+ write_en = BIT(shift + 3);
+ } else if (data->info->type == RTD1295_MISC_GPIO) {
+ reg_offset = rtd_gpio_deb_offset(data, 0);
+ if (reg_offset < 0)
+ return reg_offset;
+ shift = (offset >> 4) * 4;
+ deb_val += 1;
+ write_en = BIT(shift + 3);
+ } else {
+ reg_offset = rtd_gpio_deb_offset(data, offset);
+ if (reg_offset < 0)
+ return reg_offset;
+ shift = (offset % 8) * 4;
+ write_en = BIT(shift + 3);
+ }
+ val = (deb_val << shift) | write_en;
+
+ spin_lock_irqsave(&data->lock, flags);
+ writel_relaxed(val, data->base + reg_offset);
+ spin_unlock_irqrestore(&data->lock, flags);
+
+ 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 int rtd_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ unsigned long flags;
+ int reg_offset;
+ u32 val;
+
+ reg_offset = rtd_gpio_dir_offset(data, offset);
+ if (reg_offset < 0)
+ return reg_offset;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ val = readl_relaxed(data->base + reg_offset);
+ val &= BIT(offset % 32);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+
+ return val ? GPIO_LINE_DIRECTION_OUT : 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);
+ unsigned long flags;
+ int reg_offset;
+ u32 val;
+
+ reg_offset = rtd_gpio_dir_offset(data, offset);
+ if (reg_offset < 0)
+ return reg_offset;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ val = readl_relaxed(data->base + reg_offset);
+ if (out)
+ val |= mask;
+ else
+ val &= ~mask;
+ writel_relaxed(val, data->base + reg_offset);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+
+ 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)
+{
+ chip->set(chip, offset, value);
+
+ return rtd_gpio_set_direction(chip, offset, true);
+}
+
+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);
+ unsigned long flags;
+ int dato_reg_offset;
+ u32 val;
+
+ dato_reg_offset = rtd_gpio_dato_offset(data, offset);
+ if (dato_reg_offset < 0)
+ return;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ val = readl_relaxed(data->base + dato_reg_offset);
+ if (value)
+ val |= mask;
+ else
+ val &= ~mask;
+ writel_relaxed(val, data->base + dato_reg_offset);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+}
+
+static int rtd_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rtd_gpio *data = gpiochip_get_data(chip);
+ int dir_reg_offset, dat_reg_offset;
+ unsigned long flags;
+ u32 val;
+
+ dir_reg_offset = rtd_gpio_dir_offset(data, offset);
+ if (dir_reg_offset < 0)
+ return dir_reg_offset;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ val = readl_relaxed(data->base + dir_reg_offset);
+ val &= BIT(offset % 32);
+ dat_reg_offset = val ?
+ rtd_gpio_dato_offset(data, offset) : rtd_gpio_dati_offset(data, offset);
+
+ val = readl_relaxed(data->base + dat_reg_offset);
+ val >>= offset % 32;
+ val &= 0x1;
+
+ spin_unlock_irqrestore(&data->lock, flags);
+
+ return val;
+}
+
+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);
+ if (ie_reg_offset < 0)
+ return ie_reg_offset;
+ 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);
+ int reg_offset;
+ u32 status;
+ int hwirq;
+ int i;
+ int j;
+
+ chained_irq_enter(chip, desc);
+
+ 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;
+
+ for (i = 0; i < data->info->num_gpios; i = i + 31) {
+ reg_offset = get_reg_offset(data, i);
+ if (reg_offset < 0)
+ return;
+
+ status = readl_relaxed(data->irq_base + reg_offset) >> 1;
+ writel_relaxed(status << 1, data->irq_base + reg_offset);
+
+ while (status) {
+ j = __ffs(status);
+ status &= ~BIT(j);
+ hwirq = i + j;
+ 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_SENSE_MASK) !=
+ IRQ_TYPE_EDGE_BOTH))
+ break;
+ generic_handle_irq(girq);
+ }
+ }
+ }
+
+ 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);
+ u32 clr_mask = BIT(d->hwirq % 31) << 1;
+ u32 ie_mask = BIT(d->hwirq % 32);
+ unsigned long flags;
+ int gpda_reg_offset;
+ int gpa_reg_offset;
+ int ie_reg_offset;
+ u32 val;
+
+ ie_reg_offset = rtd_gpio_ie_offset(data, d->hwirq);
+ if (ie_reg_offset < 0)
+ return;
+ gpa_reg_offset = rtd_gpio_gpa_offset(data, d->hwirq);
+ if (gpa_reg_offset < 0)
+ return;
+ gpda_reg_offset = rtd_gpio_gpda_offset(data, d->hwirq);
+ if (gpda_reg_offset < 0)
+ return;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ 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);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+
+}
+
+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);
+ u32 ie_mask = BIT(d->hwirq % 32);
+ unsigned long flags;
+ int ie_reg_offset;
+ u32 val;
+
+ ie_reg_offset = rtd_gpio_ie_offset(data, d->hwirq);
+ if (ie_reg_offset < 0)
+ return;
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ val = readl_relaxed(data->base + ie_reg_offset);
+ val &= ~ie_mask;
+ writel_relaxed(val, data->base + ie_reg_offset);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+}
+
+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);
+ u32 mask = BIT(d->hwirq % 32);
+ unsigned long flags;
+ int dp_reg_offset;
+ bool polarity;
+ u32 val;
+
+ dp_reg_offset = rtd_gpio_dp_offset(data, d->hwirq);
+ if (dp_reg_offset < 0)
+ return dp_reg_offset;
+
+ 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;
+ }
+
+ spin_lock_irqsave(&data->lock, flags);
+
+ val = readl_relaxed(data->base + dp_reg_offset);
+ if (polarity)
+ val |= mask;
+ else
+ val &= ~mask;
+ writel_relaxed(val, data->base + dp_reg_offset);
+
+ spin_unlock_irqrestore(&data->lock, flags);
+
+ 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 const struct of_device_id rtd_gpio_of_matches[] = {
+ { .compatible = "realtek,rtd-gpio", .data = &rtd_iso_gpio_info },
+ { .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 },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rtd_gpio_of_matches);
+
+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;
+
+ 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(&pdev->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;
+
+ irq_chip = &data->gpio_chip.irq;
+ irq_chip->handler = handle_simple_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(&pdev->dev, &data->gpio_chip, data);
+}
+
+static struct platform_driver rtd_gpio_platform_driver = {
+ .driver = {
+ .name = "gpio-rtd",
+ .of_match_table = rtd_gpio_of_matches,
+ },
+ .probe = rtd_gpio_probe,
+};
+
+static int rtd_gpio_init(void)
+{
+ return platform_driver_register(&rtd_gpio_platform_driver);
+}
+
+subsys_initcall(rtd_gpio_init);
+
+static void __exit rtd_gpio_exit(void)
+{
+ platform_driver_unregister(&rtd_gpio_platform_driver);
+}
+module_exit(rtd_gpio_exit);
+
+MODULE_DESCRIPTION("Realtek DHC SoC gpio driver");
+MODULE_LICENSE("GPL v2");
--
2.42.0
