[PATCH 13/18] gpio: add GPIO controller driver for MediaTek MT7620 SoC

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[PATCH 13/18] gpio: add GPIO controller driver for MediaTek MT7620 SoC

Weijie Gao-2
This patch adds GPIO controller driver for MediaTek MT7620 SoC

Signed-off-by: Weijie Gao <[hidden email]>
---
 drivers/gpio/Kconfig       |   8 ++
 drivers/gpio/Makefile      |   1 +
 drivers/gpio/mt7620_gpio.c | 146 +++++++++++++++++++++++++++++++++++++
 3 files changed, 155 insertions(+)
 create mode 100644 drivers/gpio/mt7620_gpio.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 202fcc6f47..7e94759a79 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -471,6 +471,14 @@ config MPC83XX_SPISEL_BOOT
 
   This pin is typically used as spi chip select to a spi nor flash.
 
+config MT7620_GPIO
+ bool "MediaTek MT7620 GPIO driver"
+ depends on DM_GPIO && SOC_MT7620
+ default y
+ help
+  Device model driver for GPIO controller present in MediaTek MT7620
+  and earlier SoCs.
+
 config MT7621_GPIO
  bool "MediaTek MT7621 GPIO driver"
  depends on DM_GPIO && SOC_MT7628
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d3d0d3cacf..8541ba0b0a 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_MVEBU_GPIO) += mvebu_gpio.o
 obj-$(CONFIG_MSM_GPIO) += msm_gpio.o
 obj-$(CONFIG_$(SPL_)PCF8575_GPIO) += pcf8575_gpio.o
 obj-$(CONFIG_PM8916_GPIO) += pm8916_gpio.o
+obj-$(CONFIG_MT7620_GPIO) += mt7620_gpio.o
 obj-$(CONFIG_MT7621_GPIO) += mt7621_gpio.o
 obj-$(CONFIG_MSCC_SGPIO) += mscc_sgpio.o
 obj-$(CONFIG_NX_GPIO) += nx_gpio.o
diff --git a/drivers/gpio/mt7620_gpio.c b/drivers/gpio/mt7620_gpio.c
new file mode 100644
index 0000000000..8385ae3c49
--- /dev/null
+++ b/drivers/gpio/mt7620_gpio.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <[hidden email]>
+ *
+ * GPIO controller driver for MediaTek MT7620 SoC
+ */
+
+#include <dm.h>
+#include <errno.h>
+#include <linux/bitops.h>
+#include <linux/compat.h>
+#include <linux/io.h>
+#include <asm/gpio.h>
+
+enum mt7620_regs {
+ GPIO_REG_DATA,
+ GPIO_REG_DIR,
+ GPIO_REG_SET,
+ GPIO_REG_CLR,
+
+ __GPIO_REG_MAX
+};
+
+struct mt7620_gpio_priv {
+ void __iomem *base;
+ u32 regs[__GPIO_REG_MAX];
+ u32 count;
+};
+
+static int mt7620_gpio_get_value(struct udevice *dev, unsigned int offset)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+
+ return !!(readl(priv->base + priv->regs[GPIO_REG_DATA]) & BIT(offset));
+}
+
+static int mt7620_gpio_set_value(struct udevice *dev, unsigned int offset,
+ int value)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+ u32 reg;
+
+ reg = value ? priv->regs[GPIO_REG_SET] : priv->regs[GPIO_REG_CLR];
+
+ writel(BIT(offset), priv->base + reg);
+
+ return 0;
+}
+
+static int mt7620_gpio_direction_input(struct udevice *dev, unsigned int offset)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+
+ clrbits_32(priv->base + priv->regs[GPIO_REG_DIR], BIT(offset));
+
+ return 0;
+}
+
+static int mt7620_gpio_direction_output(struct udevice *dev,
+ unsigned int offset, int value)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+
+ /* Set value first */
+ mt7620_gpio_set_value(dev, offset, value);
+
+ setbits_32(priv->base + priv->regs[GPIO_REG_DIR], BIT(offset));
+
+ return 0;
+}
+
+static int mt7620_gpio_get_function(struct udevice *dev, unsigned int offset)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+
+ return (readl(priv->base + priv->regs[GPIO_REG_DIR]) & BIT(offset)) ?
+       GPIOF_OUTPUT : GPIOF_INPUT;
+}
+
+static const struct dm_gpio_ops mt7620_gpio_ops = {
+ .direction_input = mt7620_gpio_direction_input,
+ .direction_output = mt7620_gpio_direction_output,
+ .get_value = mt7620_gpio_get_value,
+ .set_value = mt7620_gpio_set_value,
+ .get_function = mt7620_gpio_get_function,
+};
+
+static int mt7620_gpio_probe(struct udevice *dev)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ const char *name;
+
+ name = dev_read_string(dev, "mediatek,bank-name");
+ if (!name)
+ name = dev->name;
+
+ uc_priv->gpio_count = priv->count;
+ uc_priv->bank_name = name;
+
+ return 0;
+}
+
+static int mt7620_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct mt7620_gpio_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ priv->base = dev_remap_addr_index(dev, 0);
+ if (!priv->base) {
+ dev_err(dev, "mt7620_gpio: unable to map registers\n");
+ return -EINVAL;
+ }
+
+ ret = dev_read_u32(dev, "mediatek,gpio-num", &priv->count);
+ if (ret) {
+ dev_err(dev, "mt7620_gpio: failed to get GPIO count\n");
+ return -EINVAL;
+ }
+
+ ret = dev_read_u32_array(dev, "mediatek,register-map", priv->regs,
+ __GPIO_REG_MAX);
+ if (ret) {
+ dev_err(dev, "mt7620_gpio: unable to get register map\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id mt7620_gpio_ids[] = {
+ { .compatible = "mediatek,mt7620-gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(mt7620_gpio) = {
+ .name = "mt7620_gpio",
+ .id = UCLASS_GPIO,
+ .ops = &mt7620_gpio_ops,
+ .of_match = mt7620_gpio_ids,
+ .probe = mt7620_gpio_probe,
+ .ofdata_to_platdata = mt7620_gpio_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct mt7620_gpio_priv),
+};
--
2.17.1
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Re: [PATCH 13/18] gpio: add GPIO controller driver for MediaTek MT7620 SoC

Simon Glass-3
On Fri, 16 Oct 2020 at 01:36, Weijie Gao <[hidden email]> wrote:

>
> This patch adds GPIO controller driver for MediaTek MT7620 SoC
>
> Signed-off-by: Weijie Gao <[hidden email]>
> ---
>  drivers/gpio/Kconfig       |   8 ++
>  drivers/gpio/Makefile      |   1 +
>  drivers/gpio/mt7620_gpio.c | 146 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 155 insertions(+)
>  create mode 100644 drivers/gpio/mt7620_gpio.c

Reviewed-by: Simon Glass <[hidden email]>