[PATCH 09/21] gpio: add driver for ADI ADSP-SC5xx platform
From: Arturs Artamonovs via B4 Relay
Date: Thu Sep 12 2024 - 14:23:39 EST
From: Arturs Artamonovs <arturs.artamonovs@xxxxxxxxxx>
Add ADSP-SC5xx GPIO driver.
- Support all GPIO ports
- Each gpio support seperate PINT interrupt controller
Signed-off-by: Arturs Artamonovs <Arturs.Artamonovs@xxxxxxxxxx>
Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@xxxxxxxxxxx>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@xxxxxxxxxxx>
Co-developed-by: Greg Malysa <greg.malysa@xxxxxxxxxxx>
Signed-off-by: Greg Malysa <greg.malysa@xxxxxxxxxxx>
---
drivers/gpio/Kconfig | 8 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-adi-adsp-port.c | 145 ++++++++++++++++++++++++++++++++++++++
3 files changed, 154 insertions(+)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 58f43bcced7c1f29fad5960771817f500ef67ce1..b02693f5b4cec95a59f19aa1bacf7ed72236865a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -147,6 +147,14 @@ config GPIO_74XX_MMIO
8 bits: 74244 (Input), 74273 (Output)
16 bits: 741624 (Input), 7416374 (Output)
+config GPIO_ADI_ADSP_PORT
+ bool "ADI ADSP PORT GPIO driver"
+ depends on OF_GPIO
+ select GPIO_GENERIC
+ help
+ Say Y to enable the ADSP PORT-based GPIO driver for Analog Devices
+ ADSP chips.
+
config GPIO_ALTERA
tristate "Altera GPIO"
depends on OF_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 64dd6d9d730d5a22564821df71375113e31fe057..fb02c7807a674c8a38d1128e6a25bb7c7f1f4aab 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_104_IDI_48) += gpio-104-idi-48.o
obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o
obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o
obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
+obj-$(CONFIG_GPIO_ADI_ADSP_PORT) += gpio-adi-adsp-port.o
obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o
diff --git a/drivers/gpio/gpio-adi-adsp-port.c b/drivers/gpio/gpio-adi-adsp-port.c
new file mode 100644
index 0000000000000000000000000000000000000000..a7a1867495bbdd121cda9b99991865a035dfa117
--- /dev/null
+++ b/drivers/gpio/gpio-adi-adsp-port.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADSP PORT gpio driver
+ *
+ * (C) Copyright 2022-2024 - Analog Devices, Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/soc/adi/adsp-gpio-port.h>
+#include "gpiolib.h"
+
+static int adsp_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+ struct adsp_gpio_port *port = to_adsp_gpio_port(chip);
+
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DIR_CLEAR);
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_INEN_SET);
+ return 0;
+}
+
+static int adsp_gpio_direction_output(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct adsp_gpio_port *port = to_adsp_gpio_port(chip);
+
+ /*
+ * For open drain ports, they've already been configured by pinctrl and
+ * we should not modify their output characteristics
+ */
+ if (port->open_drain & BIT(offset))
+ return 0;
+
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_INEN_CLEAR);
+
+ if (value)
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DATA_SET);
+ else
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DATA_CLEAR);
+
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DIR_SET);
+ return 0;
+}
+
+static void adsp_gpio_set_value(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ struct adsp_gpio_port *port = to_adsp_gpio_port(chip);
+
+ /*
+ * For open drain ports, set as input if driving a 1, set as output
+ * if driving a 0
+ */
+ if (port->open_drain & BIT(offset)) {
+ if (value) {
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DIR_CLEAR);
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_INEN_SET);
+ } else {
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_INEN_CLEAR);
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DATA_CLEAR);
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DIR_SET);
+ }
+ } else {
+ if (value)
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DATA_SET);
+ else
+ __adsp_gpio_writew(port, BIT(offset), ADSP_PORT_REG_DATA_CLEAR);
+ }
+}
+
+static int adsp_gpio_get_value(struct gpio_chip *chip, unsigned int offset)
+{
+ struct adsp_gpio_port *port = to_adsp_gpio_port(chip);
+
+ return !!(__adsp_gpio_readw(port, ADSP_PORT_REG_DATA) & BIT(offset));
+}
+
+static int adsp_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+ struct adsp_gpio_port *port = to_adsp_gpio_port(chip);
+ irq_hw_number_t irq = offset + port->irq_offset;
+ int map = irq_find_mapping(port->irq_domain, irq);
+
+ if (map)
+ return map;
+
+ return irq_create_mapping(port->irq_domain, irq);
+}
+
+static int adsp_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct adsp_gpio_port *gpio;
+ int ret;
+
+ gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(gpio->regs))
+ return PTR_ERR(gpio->regs);
+
+ gpio->dev = dev;
+
+ ret = adsp_attach_pint_to_gpio(gpio);
+ if (ret)
+ dev_err_probe(gpio->dev, ret, "error attaching interupt to gpio pin\n");
+
+ spin_lock_init(&gpio->lock);
+
+ gpio->gpio.label = "adsp-gpio";
+ gpio->gpio.direction_input = adsp_gpio_direction_input;
+ gpio->gpio.direction_output = adsp_gpio_direction_output;
+ gpio->gpio.get = adsp_gpio_get_value;
+ gpio->gpio.set = adsp_gpio_set_value;
+ gpio->gpio.to_irq = adsp_gpio_to_irq;
+ gpio->gpio.request = gpiochip_generic_request;
+ gpio->gpio.free = gpiochip_generic_free;
+ gpio->gpio.ngpio = ADSP_PORT_NGPIO;
+ gpio->gpio.parent = dev;
+ gpio->gpio.base = -1;
+ return devm_gpiochip_add_data(dev, &gpio->gpio, gpio);
+}
+
+static const struct of_device_id adsp_gpio_of_match[] = {
+ { .compatible = "adi,adsp-port-gpio", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, adsp_gpio_of_match);
+
+static struct platform_driver adsp_gpio_driver = {
+ .driver = {
+ .name = "adsp-port-gpio",
+ .of_match_table = adsp_gpio_of_match,
+ },
+ .probe = adsp_gpio_probe,
+};
+
+module_platform_driver(adsp_gpio_driver);
+
+MODULE_AUTHOR("Greg Malysa <greg.malysa@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices GPIO driver");
+MODULE_LICENSE("GPL v2");
\ No newline at end of file
--
2.25.1