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linux/drivers/gpio/gpio-rtd.c
Tzuyi Chang eee636bff0 gpio: rtd: Add support for Realtek DHC(Digital Home Center) RTD SoCs 
This driver enables configuration of GPIO direction, GPIO values, GPIO
debounce settings and handles GPIO interrupts.

Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2024-01-03 10:46:21 +01:00

605 lines
17 KiB
C
Raw Blame History

// 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, &reg_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");
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