[PATCH 4/4] irqchip/meson-gpio: Add support for meson s4 SoCs

[Qianggui Song]

The meson s4 SoCs support 12 gpio irq lines compared with previous
serial chips and have something different, details are as below.

IRQ Number:
- 80:68 13 pins on bank Z
- 67:48 20 pins on bank X
- 47:36 12 pins on bank H
- 35:24 12 pins on bank D
- 23:22 2  pins on bank E
- 21:14 8  pins on bank C
- 13:0  13 pins on bank B

- PADCTRL_GPIO_IRQ_CTRL0
  bit[31]:    enable/disable the whole irq lines
  bit[12-23]: single edge trigger
  bit[0-11]:  poll trigger

- PADCTRL_GPIO_IRQ_CTRL[X]
- bit[0-16]: 7 bits to chooge gpio source for irq line 2*[X] - 2
- bit[16-22]:7 bits to chooge gpio source for irq line 2*[X] - 1
  where X = 1-6

- PADCTRL_GPIO_IRQ_CTRL[7]
  bit[0-11]: both edge trigger

Signed-off-by: Qianggui Song <qianggui.song at amlogic.com>
---
 drivers/irqchip/irq-meson-gpio.c | 51 ++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/drivers/irqchip/irq-meson-gpio.c b/drivers/irqchip/irq-meson-gpio.c
index 98419428fcbd..c5d20a866c37 100644
--- a/drivers/irqchip/irq-meson-gpio.c
+++ b/drivers/irqchip/irq-meson-gpio.c
@@ -42,6 +42,11 @@
 #define REG_PIN_SEL_SHIFT(x)	(((x) % 4) * 8)
 #define REG_FILTER_SEL_SHIFT(x)	((x) * 4)
 
+/* use for s4 chips */
+#define REG_EDGE_POL_S4	0x1c
+#define REG_EDGE_POL_MASK_S4(x)				\
+	({typeof(x) _x = (x); BIT(_x) | BIT(12 + (_x)); })
+
 struct meson_gpio_irq_controller;
 static void meson8_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
 				    unsigned int channel, unsigned long hwirq);
@@ -50,6 +55,9 @@ static void meson_a1_gpio_irq_sel_pin(struct meson_gpio_irq_controller *ctl,
 				      unsigned int channel,
 				      unsigned long hwirq);
 static void meson_a1_gpio_irq_init(struct meson_gpio_irq_controller *ctl);
+static unsigned int
+meson_s4_gpio_irq_sel_type(struct meson_gpio_irq_controller *ctl,
+			   unsigned int idx, u32 val);
 
 struct irq_ctl_ops {
 	void (*gpio_irq_sel_pin)(struct meson_gpio_irq_controller *ctl,
@@ -96,6 +104,17 @@ struct meson_gpio_irq_params {
 	.pin_sel_mask = 0x7f,					\
 	.channel_num = 8,					\
 
+#define INIT_MESON_S4_COMMON_DATA(irqs)                         \
+	INIT_MESON_COMMON(irqs, meson_a1_gpio_irq_init,         \
+			  meson_a1_gpio_irq_sel_pin,            \
+			  meson_s4_gpio_irq_sel_type)           \
+	.support_edge_both = true,				\
+	.edge_both_offset = 0,					\
+	.edge_single_offset = 12,				\
+	.pol_low_offset = 0,					\
+	.pin_sel_mask = 0xff,					\
+	.channel_num = 12,					\
+
 static const struct meson_gpio_irq_params meson8_params = {
 	INIT_MESON8_COMMON_DATA(134)
 };
@@ -126,6 +145,10 @@ static const struct meson_gpio_irq_params a1_params = {
 	INIT_MESON_A1_COMMON_DATA(62)
 };
 
+static const struct meson_gpio_irq_params s4_params = {
+	INIT_MESON_S4_COMMON_DATA(82)
+};
+
 static const struct of_device_id meson_irq_gpio_matches[] = {
 	{ .compatible = "amlogic,meson8-gpio-intc", .data = &meson8_params },
 	{ .compatible = "amlogic,meson8b-gpio-intc", .data = &meson8b_params },
@@ -135,6 +158,7 @@ static const struct of_device_id meson_irq_gpio_matches[] = {
 	{ .compatible = "amlogic,meson-g12a-gpio-intc", .data = &axg_params },
 	{ .compatible = "amlogic,meson-sm1-gpio-intc", .data = &sm1_params },
 	{ .compatible = "amlogic,meson-a1-gpio-intc", .data = &a1_params },
+	{ .compatible = "amlogic,meson-s4-gpio-intc", .data = &s4_params },
 	{ }
 };
 
@@ -202,6 +226,33 @@ static void meson_a1_gpio_irq_init(struct meson_gpio_irq_controller *ctl)
 	meson_gpio_irq_update_bits(ctl, REG_EDGE_POL, BIT(31), BIT(31));
 }
 
+static unsigned int
+meson_s4_gpio_irq_sel_type(struct meson_gpio_irq_controller *ctl,
+			   unsigned int idx, unsigned int type)
+{
+	unsigned int val = 0;
+
+	meson_gpio_irq_update_bits(ctl, REG_EDGE_POL_S4, BIT(0 + (idx)), 0);
+
+	if (type == IRQ_TYPE_EDGE_BOTH) {
+		val |= BIT(ctl->params->edge_both_offset + (idx));
+		meson_gpio_irq_update_bits(ctl, REG_EDGE_POL_S4,
+					   BIT(ctl->params->edge_both_offset + (idx)), val);
+		return 0;
+	}
+
+	if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))
+		val |= BIT(ctl->params->pol_low_offset + (idx));
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+		val |= BIT(ctl->params->edge_single_offset  + (idx));
+
+	meson_gpio_irq_update_bits(ctl, REG_EDGE_POL,
+				   REG_EDGE_POL_MASK_S4(idx), val);
+
+	return 0;
+};
+
 static int
 meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl,
 			       unsigned long  hwirq,
-- 
2.34.1