soc/mediatek/mt8186: Move GPIO driving-related functions to common

Move GPIO driving-related functions to common for code reuse.

BUG=b:270911452
TEST=build pass

Change-Id: I234a2b7ef5075313144a930332bed10ffec00c6c
Signed-off-by: Jason Chen <Jason-ch.Chen@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74068
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 121 insertions, 0 deletions

diff --git a/src/soc/mediatek/common/gpio.c b/src/soc/mediatek/common/gpio.c
index daed55590d..e8a50b2b18 100644
--- a/src/soc/mediatek/common/gpio.c
+++ b/src/soc/mediatek/common/gpio.c
@@ -173,3 +173,110 @@ void gpio_eint_configure(gpio_t gpio, enum gpio_irq_type type)
 
 	write32(&mtk_eint->mask_clr.regs[pos], mask);
 }
+
+static inline bool is_valid_drv(uint8_t drv)
+{
+	return drv <= GPIO_DRV_16_MA;
+}
+
+static inline bool is_valid_drv_adv(enum gpio_drv_adv drv)
+{
+	return drv <= GPIO_DRV_ADV_1_MA && drv >= GPIO_DRV_ADV_125_UA;
+}
+
+int gpio_set_driving(gpio_t gpio, uint8_t drv)
+{
+	uint32_t mask;
+	const struct gpio_drv_info *info = get_gpio_driving_info(gpio.id);
+	const struct gpio_drv_info *adv_info = get_gpio_driving_adv_info(gpio.id);
+	void *reg, *reg_adv, *reg_addr;
+
+	if (!info)
+		return -1;
+
+	if (!is_valid_drv(drv))
+		return -1;
+
+	if (info->width == 0)
+		return -1;
+
+	mask = BIT(info->width) - 1;
+	/* Check setting value is not beyond width */
+	if ((uint32_t)drv > mask)
+		return -1;
+
+	reg_addr = gpio_find_reg_addr(gpio);
+	reg = reg_addr + info->offset;
+	clrsetbits32(reg, mask << info->shift, drv << info->shift);
+
+	/* Disable EH if supported */
+	if (adv_info && adv_info->width != 0) {
+		reg_adv = reg_addr + adv_info->offset;
+		clrbits32(reg_adv, BIT(adv_info->shift));
+	}
+
+	return 0;
+}
+
+int gpio_get_driving(gpio_t gpio)
+{
+	const struct gpio_drv_info *info = get_gpio_driving_info(gpio.id);
+	void *reg;
+
+	if (!info)
+		return -1;
+
+	if (info->width == 0)
+		return -1;
+
+	reg = gpio_find_reg_addr(gpio) + info->offset;
+	return (read32(reg) >> info->shift) & (BIT(info->width) - 1);
+}
+
+int gpio_set_driving_adv(gpio_t gpio, enum gpio_drv_adv drv)
+{
+	uint32_t mask;
+	const struct gpio_drv_info *adv_info = get_gpio_driving_adv_info(gpio.id);
+	void *reg_adv;
+
+	if (!adv_info)
+		return -1;
+
+	if (!is_valid_drv_adv(drv))
+		return -1;
+
+	if (adv_info->width == 0)
+		return -1;
+
+	/* Not include EH bit (the lowest bit) */
+	if ((uint32_t)drv > (BIT(adv_info->width - 1) - 1))
+		return -1;
+
+	reg_adv = gpio_find_reg_addr(gpio) + adv_info->offset;
+	mask = BIT(adv_info->width) - 1;
+	/* EH enable */
+	drv = (drv << 1) | BIT(0);
+
+	clrsetbits32(reg_adv, mask << adv_info->shift, drv << adv_info->shift);
+
+	return 0;
+}
+
+int gpio_get_driving_adv(gpio_t gpio)
+{
+	const struct gpio_drv_info *adv_info = get_gpio_driving_adv_info(gpio.id);
+	void *reg_adv;
+	uint32_t drv;
+
+	if (!adv_info)
+		return -1;
+
+	if (adv_info->width == 0)
+		return -1;
+
+	reg_adv = gpio_find_reg_addr(gpio) + adv_info->offset;
+	drv = (read32(reg_adv) >> adv_info->shift) & (BIT(adv_info->width) - 1);
+
+	/* Drop EH bit */
+	return drv >> 1;
+}
diff --git a/src/soc/mediatek/common/include/soc/gpio_common.h b/src/soc/mediatek/common/include/soc/gpio_common.h
index 993dbe6325..b12d9c92c5 100644
--- a/src/soc/mediatek/common/include/soc/gpio_common.h
+++ b/src/soc/mediatek/common/include/soc/gpio_common.h
@@ -33,6 +33,17 @@ enum gpio_drv_adv {
 	GPIO_DRV_ADV_1_MA = 3,
 };
 
+enum gpio_drv {
+	GPIO_DRV_2_MA = 0,
+	GPIO_DRV_4_MA = 1,
+	GPIO_DRV_6_MA = 2,
+	GPIO_DRV_8_MA = 3,
+	GPIO_DRV_10_MA = 4,
+	GPIO_DRV_12_MA = 5,
+	GPIO_DRV_14_MA = 6,
+	GPIO_DRV_16_MA = 7,
+};
+
 struct gpio_drv_info {
 	uint8_t offset;
 	uint8_t shift;
@@ -44,6 +55,9 @@ void gpio_set_pull(gpio_t gpio, enum pull_enable enable,
 void gpio_set_mode(gpio_t gpio, int mode);
 void *gpio_find_reg_addr(gpio_t gpio);
 
+const struct gpio_drv_info *get_gpio_driving_info(uint32_t raw_id);
+const struct gpio_drv_info *get_gpio_driving_adv_info(uint32_t raw_id);
+
 /* Normal driving function */
 int gpio_set_driving(gpio_t gpio, uint8_t drv);
 int gpio_get_driving(gpio_t gpio);