[U-Boot] [PATCH v2 1/4] gpio: UniPhier: add driver for UniPhier GPIO controller
Masahiro Yamada
yamada.masahiro at socionext.com
Fri Jul 17 14:15:43 CEST 2015
This GPIO controller device is used on UniPhier SoCs.
Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---
Changes in v2:
- Do not use "ngpio" property to specify the number of GPIO pins.
Instead, use .data field of OF match table.
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-uniphier.c | 192 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 199 insertions(+)
create mode 100644 drivers/gpio/gpio-uniphier.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 0c43777..1176e3f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -36,6 +36,12 @@ config SANDBOX_GPIO_COUNT
of 'anonymous' GPIOs that do not belong to any device or bank.
Select a suitable value depending on your needs.
+config GPIO_UNIPHIER
+ bool "UniPhier GPIO"
+ depends on ARCH_UNIPHIER
+ help
+ Say yes here to support UniPhier GPIOs.
+
config VYBRID_GPIO
bool "Vybrid GPIO driver"
depends on DM
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 5864850..5ec4ad7 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -44,5 +44,6 @@ oby-$(CONFIG_SX151X) += sx151x.o
obj-$(CONFIG_SUNXI_GPIO) += sunxi_gpio.o
obj-$(CONFIG_LPC32XX_GPIO) += lpc32xx_gpio.o
obj-$(CONFIG_STM32_GPIO) += stm32_gpio.o
+obj-$(CONFIG_GPIO_UNIPHIER) += gpio-uniphier.o
obj-$(CONFIG_ZYNQ_GPIO) += zynq_gpio.o
obj-$(CONFIG_VYBRID_GPIO) += vybrid_gpio.o
diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
new file mode 100644
index 0000000..e65e9f3
--- /dev/null
+++ b/drivers/gpio/gpio-uniphier.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro at socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <mapmem.h>
+#include <linux/io.h>
+#include <asm/errno.h>
+#include <asm/gpio.h>
+#include <dm/device.h>
+
+/*
+ * Unfortunately, the hardware specification adopts weird GPIO pin labeling.
+ * The ports are named as
+ * PORT00, PORT01, PORT02, ..., PORT07,
+ * PORT10, PORT11, PORT12, ..., PORT17,
+ * PORT20, PORT21, PORT22, ..., PORT27,
+ * ...
+ * PORT90, PORT91, PORT92, ..., PORT97,
+ * PORT100, PORT101, PORT102, ..., PORT107,
+ * ...
+ *
+ * The PORTs with 8 or 9 in the one's place are missing, i.e. the one's place
+ * is octal, while the other places are decimal. If we handle the port numbers
+ * as seen in the hardware documents, the GPIO offsets must be non-contiguous.
+ * It is possible to have sparse GPIO pins, but not handy for GPIO range
+ * mappings, register accessing, etc.
+ *
+ * To make things simpler (for driver and device tree implementation), this
+ * driver takes contiguously-numbered GPIO offsets. GPIO consumers should make
+ * sure to convert the PORT number into the one that fits in this driver.
+ * The conversion logic is very easy math, for example,
+ * PORT15 --> GPIO offset 13 (8 * 1 + 5)
+ * PORT123 --> GPIO offset 99 (8 * 12 + 3)
+ */
+#define UNIPHIER_GPIO_PORTS_PER_BANK 8
+
+#define UNIPHIER_GPIO_REG_DATA 0 /* data */
+#define UNIPHIER_GPIO_REG_DIR 4 /* direction (1:in, 0:out) */
+
+/* delete the following when BIT(nr) is added to include/linux/bitops.h */
+#define BIT(nr) (1UL << (nr))
+
+struct uniphier_gpio_priv {
+ void __iomem *base;
+};
+
+static unsigned uniphier_gpio_bank_to_reg(unsigned bank, unsigned reg_type)
+{
+ unsigned reg;
+
+ reg = (bank + 1) * 8 + reg_type;
+
+ /*
+ * Unfortunately, there is a register hole at offset 0x90-0x9f.
+ * Add 0x10 when crossing the hole.
+ */
+ if (reg >= 0x90)
+ reg += 0x10;
+
+ return reg;
+}
+
+static void uniphier_gpio_offset_write(struct udevice *dev, unsigned offset,
+ unsigned reg_type, int value)
+{
+ struct uniphier_gpio_priv *priv = dev_get_priv(dev);
+ unsigned bank = offset / UNIPHIER_GPIO_PORTS_PER_BANK;
+ unsigned bit = offset % UNIPHIER_GPIO_PORTS_PER_BANK;
+ unsigned reg;
+ u32 tmp;
+
+ reg = uniphier_gpio_bank_to_reg(bank, reg_type);
+
+ tmp = readl(priv->base + reg);
+ if (value)
+ tmp |= BIT(bit);
+ else
+ tmp &= ~BIT(bit);
+ writel(tmp, priv->base + reg);
+}
+
+static int uniphier_gpio_offset_read(struct udevice *dev, unsigned offset,
+ unsigned reg_type)
+{
+ struct uniphier_gpio_priv *priv = dev_get_priv(dev);
+ unsigned bank = offset / UNIPHIER_GPIO_PORTS_PER_BANK;
+ unsigned bit = offset % UNIPHIER_GPIO_PORTS_PER_BANK;
+ unsigned reg;
+
+ reg = uniphier_gpio_bank_to_reg(bank, reg_type);
+
+ return readl(priv->base + reg) & BIT(bit) ? 1 : 0;
+}
+
+static int uniphier_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+ uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DIR, 1);
+
+ return 0;
+}
+
+static int uniphier_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DATA, value);
+ uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DIR, 0);
+
+ return 0;
+}
+
+static int uniphier_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+ return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_REG_DATA);
+}
+
+static int uniphier_gpio_set_value(struct udevice *dev, unsigned offset,
+ int value)
+{
+ uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DATA, value);
+
+ return 0;
+}
+
+static int uniphier_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_REG_DIR) ?
+ GPIOF_INPUT : GPIOF_OUTPUT;
+}
+
+static const struct dm_gpio_ops uniphier_gpio_ops = {
+ .direction_input = uniphier_gpio_direction_input,
+ .direction_output = uniphier_gpio_direction_output,
+ .get_value = uniphier_gpio_get_value,
+ .set_value = uniphier_gpio_set_value,
+ .get_function = uniphier_gpio_get_function,
+};
+
+static int uniphier_gpio_probe(struct udevice *dev)
+{
+ struct uniphier_gpio_priv *priv = dev_get_priv(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ DECLARE_GLOBAL_DATA_PTR;
+ fdt_addr_t addr;
+ fdt_size_t size;
+
+ addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg",
+ &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->base = map_sysmem(addr, size);
+ if (!priv->base)
+ return -ENOMEM;
+
+ uc_priv->gpio_count = UNIPHIER_GPIO_PORTS_PER_BANK * dev->driver_data;
+
+ return 0;
+}
+
+static int uniphier_gpio_remove(struct udevice *dev)
+{
+ struct uniphier_gpio_priv *priv = dev_get_priv(dev);
+
+ unmap_sysmem(priv->base);
+
+ return 0;
+}
+
+/* .data = the number of GPIO banks */
+static const struct udevice_id uniphier_gpio_match[] = {
+ { .compatible = "socionext,ph1-sld3-gpio", .data = 17 },
+ { .compatible = "socionext,ph1-ld4-gpio", .data = 17 },
+ { .compatible = "socionext,ph1-pro4-gpio", .data = 31 },
+ { .compatible = "socionext,ph1-sld8-gpio", .data = 17 },
+ { .compatible = "socionext,ph1-pro5-gpio", .data = 31 },
+ { .compatible = "socionext,proxstream2-gpio", .data = 29 },
+ { .compatible = "socionext,ph1-ld6b-gpio", .data = 29 },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(uniphier_gpio) = {
+ .name = "uniphier_gpio",
+ .id = UCLASS_GPIO,
+ .of_match = uniphier_gpio_match,
+ .probe = uniphier_gpio_probe,
+ .remove = uniphier_gpio_remove,
+ .priv_auto_alloc_size = sizeof(struct uniphier_gpio_priv),
+ .ops = &uniphier_gpio_ops,
+};
--
1.9.1
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