[U-Boot] [PATCH v1 02/16] gpio: Add support for Qualcomm gpio controller

Mateusz Kulikowski
2016-01-06T18:21:14Z

Add support for gpio controllers on Qualcomm Snapdragon devices.
This devices are usually called Top Level Mode Multiplexing in
Qualcomm documentation.

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---

Changes in v1:
- Added dt binding documentation
- Added help to KConfig
- Use clrsetbits() to switch direction
- Fixed include order
- Added #defines for registers/register fields
- Added secondary compatible string

doc/device-tree-bindings/gpio/gpio-msm.txt | 22 +++++
drivers/gpio/Kconfig | 14 ++++
drivers/gpio/Makefile | 2 +-
drivers/gpio/msm_gpio.c | 129 +++++++++++++++++++++++++++++
4 files changed, 166 insertions(+), 1 deletion(-)
create mode 100644 doc/device-tree-bindings/gpio/gpio-msm.txt
create mode 100644 drivers/gpio/msm_gpio.c

diff --git a/doc/device-tree-bindings/gpio/gpio-msm.txt b/doc/device-tree-bindings/gpio/gpio-msm.txt
new file mode 100644
index 0000000..966ce0a
--- /dev/null
+++ b/doc/device-tree-bindings/gpio/gpio-msm.txt
@@ -0,0 +1,22 @@
+Qualcomm Snapdragon GPIO controller
+
+Required properties:
+- compatible : "qcom,msm8916-pinctrl" or "qcom,apq8016-pinctrl"
+- reg : Physical base address and length of the controller's registers.
+ This controller is called "Top Level Mode Multiplexing" in
+ Qualcomm documentation.
+- #gpio-cells : Should be one (pin number).
+- gpio-controller : Marks the device node as a GPIO controller.
+- gpio-count: Number of GPIO pins.
+- gpio-bank-name: (optional) name of gpio bank. As default "soc" is used.
+
+Example:
+
+soc_gpios: pinctrl at 1000000 {
+ compatible = "qcom,msm8916-pinctrl";
+ reg = <0x1000000 0x300000>;
+ gpio-controller;
+ gpio-count = <122>;
+ gpio-bank-name="soc";
+ #gpio-cells = <1>;
+};
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index e60e9fd..3d112b9 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -46,6 +46,20 @@ config LPC32XX_GPIO
help
Support for the LPC32XX GPIO driver.

+config MSM_GPIO
+ bool "Qualcomm GPIO driver"
+ depends on DM_GPIO
+ default n
+ help
+ Support GPIO controllers on Qualcomm Snapdragon family of SoCs.
+ This controller have single bank (default name "soc"), every
+ gpio has it's own set of registers.
+ Only simple GPIO operations are supported (get/set, change of
+ direction and checking pin function).
+ Supported devices:
+ - APQ8016
+ - MSM8916
+
config ROCKCHIP_GPIO
bool "Rockchip GPIO driver"
depends on DM_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index fb4fd25..9520b1e 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -46,4 +46,4 @@ obj-$(CONFIG_STM32_GPIO) += stm32_gpio.o
obj-$(CONFIG_ZYNQ_GPIO) += zynq_gpio.o
obj-$(CONFIG_VYBRID_GPIO) += vybrid_gpio.o
obj-$(CONFIG_HIKEY_GPIO) += hi6220_gpio.o
-
+obj-$(CONFIG_MSM_GPIO) += msm_gpio.o
diff --git a/drivers/gpio/msm_gpio.c b/drivers/gpio/msm_gpio.c
new file mode 100644
index 0000000..173c526
--- /dev/null
+++ b/drivers/gpio/msm_gpio.c
@@ -0,0 +1,129 @@
+/*
+ * Qualcomm GPIO driver
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Register offsets */
+#define GPIO_CONFIG_OFF(no) ((no) * 0x1000)
+#define GPIO_IN_OUT_OFF(no) ((no) * 0x1000 + 0x4)
+
+/* OE */
+#define GPIO_OE_DISABLE (0x0 << 9)
+#define GPIO_OE_ENABLE (0x1 << 9)
+#define GPIO_OE_MASK (0x1 << 9)
+
+/* GPIO_IN_OUT register shifts. */
+#define GPIO_IN 0
+#define GPIO_OUT 1
+
+struct msm_gpio_bank {
+ phys_addr_t base;
+};
+
+static int msm_gpio_direction_input(struct udevice *dev, unsigned int gpio)
+{
+ struct msm_gpio_bank *priv = dev_get_priv(dev);
+ phys_addr_t reg = priv->base + GPIO_CONFIG_OFF(gpio);
+
+ /* Disable OE bit */
+ clrsetbits_le32(reg, GPIO_OE_MASK, GPIO_OE_DISABLE);
+ return 0;
+}
+
+static int msm_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
+{
+ struct msm_gpio_bank *priv = dev_get_priv(dev);
+
+ value = !!value;
+ /* set value */
+ writel(value << GPIO_OUT, priv->base + GPIO_IN_OUT_OFF(gpio));
+ return 0;
+}
+
+static int msm_gpio_direction_output(struct udevice *dev, unsigned gpio,
+ int value)
+{
+ struct msm_gpio_bank *priv = dev_get_priv(dev);
+ phys_addr_t reg = priv->base + GPIO_CONFIG_OFF(gpio);
+
+ value = !!value;
+ /* set value */
+ writel(value << GPIO_OUT, priv->base + GPIO_IN_OUT_OFF(gpio));
+ /* switch direction */
+ clrsetbits_le32(reg, GPIO_OE_MASK, GPIO_OE_ENABLE);
+ return 0;
+}
+
+static int msm_gpio_get_value(struct udevice *dev, unsigned gpio)
+{
+ struct msm_gpio_bank *priv = dev_get_priv(dev);
+
+ return !!(readl(priv->base + GPIO_IN_OUT_OFF(gpio)) >> GPIO_IN);
+}
+
+static int msm_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ struct msm_gpio_bank *priv = dev_get_priv(dev);
+
+ if (readl(priv->base + GPIO_CONFIG_OFF(offset)) & GPIO_OE_ENABLE)
+ return GPIOF_OUTPUT;
+ return GPIOF_INPUT;
+}
+
+static const struct dm_gpio_ops gpio_msm_ops = {
+ .direction_input = msm_gpio_direction_input,
+ .direction_output = msm_gpio_direction_output,
+ .get_value = msm_gpio_get_value,
+ .set_value = msm_gpio_set_value,
+ .get_function = msm_gpio_get_function,
+};
+
+static int msm_gpio_probe(struct udevice *dev)
+{
+ struct msm_gpio_bank *priv = dev_get_priv(dev);
+
+ priv->base = dev_get_addr(dev);
+ return priv->base == FDT_ADDR_T_NONE;
+}
+
+static int msm_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+ "gpio-count", 0);
+ uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
+ "gpio-bank-name", NULL);
+ if (uc_priv->bank_name == NULL)
+ uc_priv->bank_name = "soc";
+ return 0;
+}
+
+static const struct udevice_id msm_gpio_ids[] = {
+ { .compatible = "qcom,msm8916-pinctrl" },
+ { .compatible = "qcom,apq8016-pinctrl" },
+ { }
+};
+
+U_BOOT_DRIVER(gpio_msm) = {
+ .name = "gpio_msm",
+ .id = UCLASS_GPIO,
+ .of_match = msm_gpio_ids,
+ .ofdata_to_platdata = msm_gpio_ofdata_to_platdata,
+ .probe = msm_gpio_probe,
+ .ops = &gpio_msm_ops,
+ .priv_auto_alloc_size = sizeof(struct msm_gpio_bank),
+};
+
+
--
2.5.0