[U-Boot] [PATCH 1/9] gpio: renesas: Add RZ/A1 R7S72100 GPIO driver
Marek Vasut
marek.vasut at gmail.com
Sat May 4 17:24:19 UTC 2019
Add GPIO driver for RZ/A1 SoC. The IP is very different from the
R-Car Gen2/Gen3 one already present in the tree, hence a custom
driver.
Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
Cc: Chris Brandt <chris.brandt at renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
---
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-rza1.c | 134 +++++++++++++++++++++++++++++++++++++++
3 files changed, 141 insertions(+)
create mode 100644 drivers/gpio/gpio-rza1.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b3e4ecc50e..4e2095dcd6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -169,6 +169,12 @@ config RCAR_GPIO
help
This driver supports the GPIO banks on Renesas RCar SoCs.
+config RZA1_GPIO
+ bool "Renesas RZ/A1 GPIO driver"
+ depends on DM_GPIO && RZA1
+ help
+ This driver supports the GPIO banks on Renesas RZ/A1 R7S72100 SoCs.
+
config ROCKCHIP_GPIO
bool "Rockchip GPIO driver"
depends on DM_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 3be325044f..7337153e0e 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_PCA953X) += pca953x.o
obj-$(CONFIG_PCA9698) += pca9698.o
obj-$(CONFIG_ROCKCHIP_GPIO) += rk_gpio.o
obj-$(CONFIG_RCAR_GPIO) += gpio-rcar.o
+obj-$(CONFIG_RZA1_GPIO) += gpio-rza1.o
obj-$(CONFIG_S5P) += s5p_gpio.o
obj-$(CONFIG_SANDBOX_GPIO) += sandbox.o
obj-$(CONFIG_SPEAR_GPIO) += spear_gpio.o
diff --git a/drivers/gpio/gpio-rza1.c b/drivers/gpio/gpio-rza1.c
new file mode 100644
index 0000000000..ce2453e2ba
--- /dev/null
+++ b/drivers/gpio/gpio-rza1.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Marek Vasut <marek.vasut at gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+
+#define P(bank) (0x0000 + (bank) * 4)
+#define PSR(bank) (0x0100 + (bank) * 4)
+#define PPR(bank) (0x0200 + (bank) * 4)
+#define PM(bank) (0x0300 + (bank) * 4)
+#define PMC(bank) (0x0400 + (bank) * 4)
+#define PFC(bank) (0x0500 + (bank) * 4)
+#define PFCE(bank) (0x0600 + (bank) * 4)
+#define PNOT(bank) (0x0700 + (bank) * 4)
+#define PMSR(bank) (0x0800 + (bank) * 4)
+#define PMCSR(bank) (0x0900 + (bank) * 4)
+#define PFCAE(bank) (0x0A00 + (bank) * 4)
+#define PIBC(bank) (0x4000 + (bank) * 4)
+#define PBDC(bank) (0x4100 + (bank) * 4)
+#define PIPC(bank) (0x4200 + (bank) * 4)
+
+#define RZA1_MAX_GPIO_PER_BANK 16
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct r7s72100_gpio_priv {
+ void __iomem *regs;
+ int bank;
+};
+
+static int r7s72100_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+ struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
+
+ return !!(readw(priv->regs + PPR(priv->bank)) & BIT(offset));
+}
+
+static int r7s72100_gpio_set_value(struct udevice *dev, unsigned line,
+ int value)
+{
+ struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
+
+ writel(BIT(line + 16) | (value ? BIT(line) : 0),
+ priv->regs + PSR(priv->bank));
+
+ return 0;
+}
+
+static void r7s72100_gpio_set_direction(struct udevice *dev, unsigned line,
+ bool output)
+{
+ struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
+
+ writel(BIT(line + 16), priv->regs + PMCSR(priv->bank));
+ writel(BIT(line + 16) | (output ? 0 : BIT(line)),
+ priv->regs + PMSR(priv->bank));
+
+ clrsetbits_le16(priv->regs + PIBC(priv->bank), BIT(line),
+ output ? 0 : BIT(line));
+}
+
+static int r7s72100_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+ r7s72100_gpio_set_direction(dev, offset, false);
+ return 0;
+}
+
+static int r7s72100_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ /* write GPIO value to output before selecting output mode of pin */
+ r7s72100_gpio_set_value(dev, offset, value);
+ r7s72100_gpio_set_direction(dev, offset, true);
+
+ return 0;
+}
+
+static int r7s72100_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
+
+ if (readw(priv->regs + PM(priv->bank)) & BIT(offset))
+ return GPIOF_INPUT;
+ else
+ return GPIOF_OUTPUT;
+}
+
+static const struct dm_gpio_ops r7s72100_gpio_ops = {
+ .direction_input = r7s72100_gpio_direction_input,
+ .direction_output = r7s72100_gpio_direction_output,
+ .get_value = r7s72100_gpio_get_value,
+ .set_value = r7s72100_gpio_set_value,
+ .get_function = r7s72100_gpio_get_function,
+};
+
+static int r7s72100_gpio_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
+ struct fdtdec_phandle_args args;
+ int node = dev_of_offset(dev);
+ int ret;
+
+ fdt_addr_t addr_base;
+
+ uc_priv->bank_name = dev->name;
+ dev = dev_get_parent(dev);
+ addr_base = devfdt_get_addr(dev);
+ if (addr_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->regs = (void __iomem *)addr_base;
+
+ ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
+ NULL, 3, 0, &args);
+ priv->bank = ret == 0 ? (args.args[1] / RZA1_MAX_GPIO_PER_BANK) : -1;
+ uc_priv->gpio_count = ret == 0 ? args.args[2] : RZA1_MAX_GPIO_PER_BANK;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(r7s72100_gpio) = {
+ .name = "r7s72100-gpio",
+ .id = UCLASS_GPIO,
+ .ops = &r7s72100_gpio_ops,
+ .priv_auto_alloc_size = sizeof(struct r7s72100_gpio_priv),
+ .probe = r7s72100_gpio_probe,
+};
--
2.20.1
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