[PATCH v3 1/2] gpio: tegra: add multiple interrupt support

[Prathamesh Shete <pshete@xxxxxxxxxx>]

From: pshete <pshete@xxxxxxxxxx>

T19x GPIO controller's support multiple interrupts. The GPIO
controller is capable to route 8 interrupts per controller in
case of NON-AON GPIO's and 4 interrupts per controller in AON GPIO.
This is new feature starting Tegra194
The interrupt route map determines which interrupt line is to be used.

Signed-off-by: Prathamesh Shete <pshete@xxxxxxxxxx>
---
 drivers/gpio/gpio-tegra186.c | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index d38980b9923a..c1172da9aebf 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2016-2017 NVIDIA Corporation
+ * Copyright (c) 2016-2021 NVIDIA Corporation
  *
  * Author: Thierry Reding <treding@xxxxxxxxxx>
  */
@@ -68,6 +68,7 @@ struct tegra_gpio_soc {
 	unsigned int num_ports;
 	const char *name;
 	unsigned int instance;
+	bool multi_ints;
 
 	const struct tegra186_pin_range *pin_ranges;
 	unsigned int num_pin_ranges;
@@ -450,7 +451,8 @@ static void tegra186_gpio_irq(struct irq_desc *desc)
 	struct irq_domain *domain = gpio->gpio.irq.domain;
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int parent = irq_desc_get_irq(desc);
-	unsigned int i, offset = 0;
+	unsigned int i, j, offset = 0;
+	int intr_cntr;
 
 	chained_irq_enter(chip, desc);
 
@@ -462,9 +464,20 @@ static void tegra186_gpio_irq(struct irq_desc *desc)
 
 		base = gpio->base + port->bank * 0x1000 + port->port * 0x200;
 
-		/* skip ports that are not associated with this bank */
-		if (parent != gpio->irq[port->bank])
-			goto skip;
+		if (!gpio->soc->multi_ints) {
+			/* skip ports that are not associated with this bank */
+			if (parent != gpio->irq[port->bank])
+				goto skip;
+
+		} else {
+			intr_cntr = 0;
+			for (j = 0; j < 8; j++) {
+				if (parent != gpio->irq[(port->bank * 8) + j])
+					intr_cntr++;
+			}
+			if (!(intr_cntr & 0xF))
+				goto skip;
+		}
 
 		value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));
 
@@ -772,6 +785,7 @@ static const struct tegra_gpio_soc tegra186_main_soc = {
 	.ports = tegra186_main_ports,
 	.name = "tegra186-gpio",
 	.instance = 0,
+	.multi_ints = false,
 };
 
 #define TEGRA186_AON_GPIO_PORT(_name, _bank, _port, _pins)	\
@@ -798,6 +812,7 @@ static const struct tegra_gpio_soc tegra186_aon_soc = {
 	.ports = tegra186_aon_ports,
 	.name = "tegra186-gpio-aon",
 	.instance = 1,
+	.multi_ints = false,
 };
 
 #define TEGRA194_MAIN_GPIO_PORT(_name, _bank, _port, _pins)	\
@@ -852,6 +867,7 @@ static const struct tegra_gpio_soc tegra194_main_soc = {
 	.num_pin_ranges = ARRAY_SIZE(tegra194_main_pin_ranges),
 	.pin_ranges = tegra194_main_pin_ranges,
 	.pinmux = "nvidia,tegra194-pinmux",
+	.multi_ints = true,
 };
 
 #define TEGRA194_AON_GPIO_PORT(_name, _bank, _port, _pins)	\
@@ -875,6 +891,7 @@ static const struct tegra_gpio_soc tegra194_aon_soc = {
 	.ports = tegra194_aon_ports,
 	.name = "tegra194-gpio-aon",
 	.instance = 1,
+	.multi_ints = true,
 };
 
 static const struct of_device_id tegra186_gpio_of_match[] = {
-- 
2.17.1