Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- livetree API (dev_read_...) is used instead of fdt one (fdt...).
Signed-off-by: Stefan Bosch <stefa...@posteo.net>
---
Changes in v3:
- Changed to livetree API as proposed by patman:
fdtdec_get_int() --> dev_read_s32_default()
fdt_getprop() --> dev_read_string()
Changes in v2:
- commit "i2c: mmc: add nexell driver (gpio, i2c, mmc, pwm)" splitted
into separate commits for gpio, i2c, mmc, pwm.
- cosmetic: line "obj-$(CONFIG_NX_GPIO) += nx_gpio.o" in
drivers/gpio/Makefile moved up.
drivers/gpio/Kconfig | 9 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/nx_gpio.c | 250 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 260 insertions(+)
create mode 100644 drivers/gpio/nx_gpio.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d87f6cc..921d1e2 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -438,4 +438,13 @@ config MT7621_GPIO
help
Say yes here to support MediaTek MT7621 compatible GPIOs.
+config NX_GPIO
+ bool "Nexell GPIO driver"
+ depends on DM_GPIO
+ help
+ Support GPIO access on Nexell SoCs. The GPIOs are arranged into
+ a number of banks (different for each SoC type) each with 32 GPIOs.
+ The GPIOs for a device are defined in the device tree with one node
+ for each bank.
+
endmenu
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 7638259..334c5f2 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -64,4 +64,5 @@ obj-$(CONFIG_$(SPL_)PCF8575_GPIO) += pcf8575_gpio.o
obj-$(CONFIG_PM8916_GPIO) += pm8916_gpio.o
obj-$(CONFIG_MT7621_GPIO) += mt7621_gpio.o
obj-$(CONFIG_MSCC_SGPIO) += mscc_sgpio.o
+obj-$(CONFIG_NX_GPIO) += nx_gpio.o
obj-$(CONFIG_SIFIVE_GPIO) += sifive-gpio.o
diff --git a/drivers/gpio/nx_gpio.c b/drivers/gpio/nx_gpio.c
new file mode 100644
index 0000000..5ec73c4
--- /dev/null
+++ b/drivers/gpio/nx_gpio.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * DeokJin, Lee <truevir...@nexell.co.kr>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct nx_gpio_regs {
+ u32 data; /* Data register */
+ u32 outputenb; /* Output Enable register */
+ u32 detmode[2]; /* Detect Mode Register */
+ u32 intenb; /* Interrupt Enable Register */
+ u32 det; /* Event Detect Register */
+ u32 pad; /* Pad Status Register */
+};
+
+struct nx_alive_gpio_regs {
+ u32 pwrgate; /* Power Gating Register */
+ u32 reserved0[28]; /* Reserved0 */
+ u32 outputenb_reset;/* Alive GPIO Output Enable Reset Register */
+ u32 outputenb; /* Alive GPIO Output Enable Register */
+ u32 outputenb_read; /* Alive GPIO Output Read Register */
+ u32 reserved1[3]; /* Reserved1 */
+ u32 pad_reset; /* Alive GPIO Output Reset Register */
+ u32 data; /* Alive GPIO Output Register */
+ u32 pad_read; /* Alive GPIO Pad Read Register */
+ u32 reserved2[33]; /* Reserved2 */
+ u32 pad; /* Alive GPIO Input Value Register */
+};
+
+struct nx_gpio_platdata {
+ void *regs;
+ int gpio_count;
+ const char *bank_name;
+};
+
+static int nx_alive_gpio_is_check(struct udevice *dev)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ const char *bank_name = plat->bank_name;
+
+ if (!strcmp(bank_name, "gpio_alv"))
+ return 1;
+
+ return 0;
+}
+
+static int nx_alive_gpio_direction_input(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+
+ setbits_le32(®s->outputenb_reset, 1 << pin);
+
+ return 0;
+}
+
+static int nx_alive_gpio_direction_output(struct udevice *dev, unsigned int
pin,
+ int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ setbits_le32(®s->pad_reset, 1 << pin);
+
+ setbits_le32(®s->outputenb, 1 << pin);
+
+ return 0;
+}
+
+static int nx_alive_gpio_get_value(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+ unsigned int mask = 1UL << pin;
+ unsigned int value;
+
+ value = (readl(®s->pad_read) & mask) >> pin;
+
+ return value;
+}
+
+static int nx_alive_gpio_set_value(struct udevice *dev, unsigned int pin,
+ int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ clrbits_le32(®s->pad_reset, 1 << pin);
+
+ return 0;
+}
+
+static int nx_alive_gpio_get_function(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+ unsigned int mask = (1UL << pin);
+ unsigned int output;
+
+ output = readl(®s->outputenb_read) & mask;
+
+ if (output)
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int nx_gpio_direction_input(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_direction_input(dev, pin);
+
+ clrbits_le32(®s->outputenb, 1 << pin);
+
+ return 0;
+}
+
+static int nx_gpio_direction_output(struct udevice *dev, unsigned int pin,
+ int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_direction_output(dev, pin, val);
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ clrbits_le32(®s->data, 1 << pin);
+
+ setbits_le32(®s->outputenb, 1 << pin);
+
+ return 0;
+}
+
+static int nx_gpio_get_value(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+ unsigned int mask = 1UL << pin;
+ unsigned int value;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_get_value(dev, pin);
+
+ value = (readl(®s->pad) & mask) >> pin;
+
+ return value;
+}
+
+static int nx_gpio_set_value(struct udevice *dev, unsigned int pin, int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_set_value(dev, pin, val);
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ clrbits_le32(®s->data, 1 << pin);
+
+ return 0;
+}
+
+static int nx_gpio_get_function(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+ unsigned int mask = (1UL << pin);
+ unsigned int output;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_get_function(dev, pin);
+
+ output = readl(®s->outputenb) & mask;
+
+ if (output)
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int nx_gpio_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+
+ uc_priv->gpio_count = plat->gpio_count;
+ uc_priv->bank_name = plat->bank_name;
+
+ return 0;
+}
+
+static int nx_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+
+ plat->regs = map_physmem(devfdt_get_addr(dev),
+ sizeof(struct nx_gpio_regs),
+ MAP_NOCACHE);
+ plat->gpio_count = dev_read_s32_default(dev, "nexell,gpio-bank-width",
+ 32);
+ plat->bank_name = dev_read_string(dev, "gpio-bank-name");
+
+ return 0;
+}
+
+static const struct dm_gpio_ops nx_gpio_ops = {
+ .direction_input = nx_gpio_direction_input,
+ .direction_output = nx_gpio_direction_output,
+ .get_value = nx_gpio_get_value,
+ .set_value = nx_gpio_set_value,
+ .get_function = nx_gpio_get_function,
+};
+
+static const struct udevice_id nx_gpio_ids[] = {
+ { .compatible = "nexell,nexell-gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(nx_gpio) = {
+ .name = "nx_gpio",
+ .id = UCLASS_GPIO,
+ .of_match = nx_gpio_ids,
+ .ops = &nx_gpio_ops,
+ .ofdata_to_platdata = nx_gpio_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct nx_gpio_platdata),
+ .probe = nx_gpio_probe,
+};
--
1.9.1
