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Date: Thu, 5 Aug 2021 23:12:19 +0530
From: Piyush Mehta <piyush.mehta@...inx.com>
To: <arnd@...db.de>, <zou_wei@...wei.com>,
<gregkh@...uxfoundation.org>, <linus.walleij@...aro.org>,
<michal.simek@...inx.com>, <wendy.liang@...inx.com>,
<iwamatsu@...auri.org>, <bgolaszewski@...libre.com>,
<robh+dt@...nel.org>, <rajan.vaja@...inx.com>
CC: <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<git@...inx.com>, <sgoud@...inx.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
Piyush Mehta <piyush.mehta@...inx.com>
Subject: [PATCH V2 3/3] gpio: modepin: Add driver support for modepin GPIO controller
This patch adds driver support for the zynqmp modepin GPIO controller.
GPIO modepin driver set and get the value and status of the PS_MODE pin,
based on device-tree pin configuration. These four mode pins are
configurable as input/output. The mode pin has a control register, which
have lower four-bits [0:3] are configurable as input/output, next four-bits
can be used for reading the data as input[4:7], and next setting the
output pin state output[8:11].
Signed-off-by: Piyush Mehta <piyush.mehta@...inx.com>
---
Changes in v2:
- Modepin driver- Addressed review comments:
- Update APIs
- Removed unwanted variables
- Handle return path for probe function
https://lore.kernel.org/linux-arm-kernel/20210615080553.2021061-2-piyush.mehta@xilinx.com/T/#m276c8a5c52f8dc1ed1cd91a2d660f78d498e4ae5
---
drivers/gpio/Kconfig | 12 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-zynqmp-modepin.c | 158 +++++++++++++++++++++++++++++++++++++
3 files changed, 171 insertions(+)
create mode 100644 drivers/gpio/gpio-zynqmp-modepin.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index fab5710..90a3a3d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -755,6 +755,18 @@ config GPIO_ZYNQ
help
Say yes here to support Xilinx Zynq GPIO controller.
+config GPIO_ZYNQMP_MODEPIN
+ tristate "ZynqMP ps-mode pin gpio configuration driver"
+ depends on ZYNQMP_FIRMWARE
+ default ZYNQMP_FIRMWARE
+ help
+ Say yes here to support the ZynqMP ps-mode pin gpio configuration
+ driver.
+
+ This ps-mode pin gpio driver is based on GPIO framework, PS_MODE
+ is 4-bits boot mode pins. It sets and gets the status of
+ the ps-mode pin. Every pin can be configured as input/output.
+
config GPIO_LOONGSON1
tristate "Loongson1 GPIO support"
depends on MACH_LOONGSON32
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 32a3265..978dc4595 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -183,3 +183,4 @@ obj-$(CONFIG_GPIO_XRA1403) += gpio-xra1403.o
obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
+obj-$(CONFIG_GPIO_ZYNQMP_MODEPIN) += gpio-zynqmp-modepin.o
diff --git a/drivers/gpio/gpio-zynqmp-modepin.c b/drivers/gpio/gpio-zynqmp-modepin.c
new file mode 100644
index 0000000..99c69df
--- /dev/null
+++ b/drivers/gpio/gpio-zynqmp-modepin.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the ps-mode pin configuration.
+ *
+ * Copyright (c) 2021 Xilinx, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+
+/* 4-bit boot mode pins */
+#define MODE_PINS 4
+
+/**
+ * modepin_gpio_get_value - Get the state of the specified pin of GPIO device
+ * @chip: gpio_chip instance to be worked on
+ * @pin: gpio pin number within the device
+ *
+ * This function reads the state of the specified pin of the GPIO device.
+ *
+ * Return: 0 if the pin is low, 1 if pin is high, -EINVAL wrong pin configured
+ * or error value.
+ */
+static int modepin_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
+{
+ u32 regval = 0;
+ int ret;
+
+ ret = zynqmp_pm_bootmode_read(®val);
+ if (ret) {
+ pr_err("modepin: get value err %d\n", ret);
+ return ret;
+ }
+
+ return !!(regval & BIT(pin + 8));
+}
+
+/**
+ * modepin_gpio_set_value - Modify the state of the pin with specified value
+ * @chip: gpio_chip instance to be worked on
+ * @pin: gpio pin number within the device
+ * @state: value used to modify the state of the specified pin
+ *
+ * This function reads the state of the specified pin of the GPIO device, mask
+ * with the capture state of GPIO pin, and update pin of GPIO device.
+ *
+ * Return: None.
+ */
+static void modepin_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
+ int state)
+{
+ u32 bootpin_val = 0;
+ int ret;
+
+ ret = zynqmp_pm_bootmode_read(&bootpin_val);
+ if (ret)
+ pr_err("modepin: get value err %d\n", ret);
+
+ if (state)
+ bootpin_val |= BIT(pin + 8);
+ else
+ bootpin_val &= ~BIT(pin + 8);
+
+ /* Configure bootpin value */
+ ret = zynqmp_pm_bootmode_write(bootpin_val);
+ if (ret)
+ pr_err("modepin: %s failed\n", __func__);
+}
+
+/**
+ * modepin_gpio_dir_in - Set the direction of the specified GPIO pin as input
+ * @chip: gpio_chip instance to be worked on
+ * @pin: gpio pin number within the device
+ *
+ * Return: 0 always
+ */
+static int modepin_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
+{
+ return 0;
+}
+
+/**
+ * modepin_gpio_dir_out - Set the direction of the specified GPIO pin as output
+ * @chip: gpio_chip instance to be worked on
+ * @pin: gpio pin number within the device
+ * @state: value to be written to specified pin
+ *
+ * Return: 0 always
+ */
+static int modepin_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
+ int state)
+{
+ return 0;
+}
+
+/**
+ * modepin_gpio_probe - Initialization method for modepin_gpio
+ * @pdev: platform device instance
+ *
+ * Return: 0 on success, negative error otherwise.
+ */
+static int modepin_gpio_probe(struct platform_device *pdev)
+{
+ struct gpio_chip *chip;
+ int status;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, chip);
+
+ /* configure the gpio chip */
+ chip->base = -1;
+ chip->ngpio = MODE_PINS;
+ chip->owner = THIS_MODULE;
+ chip->parent = &pdev->dev;
+ chip->get = modepin_gpio_get_value;
+ chip->set = modepin_gpio_set_value;
+ chip->direction_input = modepin_gpio_dir_in;
+ chip->direction_output = modepin_gpio_dir_out;
+ chip->label = dev_name(&pdev->dev);
+
+ /* modepin gpio registration */
+ status = devm_gpiochip_add_data(&pdev->dev, chip, chip);
+ if (status)
+ return dev_err_probe(&pdev->dev, status,
+ "Failed to add GPIO chip\n");
+
+ return status;
+}
+
+static const struct of_device_id modepin_platform_id[] = {
+ { .compatible = "xlnx,zynqmp-gpio-modepin", },
+ { }
+};
+
+static struct platform_driver modepin_platform_driver = {
+ .driver = {
+ .name = "modepin-gpio",
+ .of_match_table = modepin_platform_id,
+ },
+ .probe = modepin_gpio_probe,
+};
+
+module_platform_driver(modepin_platform_driver);
+
+MODULE_AUTHOR("Piyush Mehta <piyush.mehta@...inx.com>");
+MODULE_DESCRIPTION("ZynqMP Boot PS_MODE Configuration");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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