dm: gpio: vf610: Add GPIO driver support

Add GPIO driver support to Freescale VF610

Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>

3 files changed, 177 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 0840a30..0c43777 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -35,3 +35,10 @@ config SANDBOX_GPIO_COUNT
 	  are specified using the device tree. But you can also have a number
 	  of 'anonymous' GPIOs that do not belong to any device or bank.
 	  Select a suitable value depending on your needs.
+
+config VYBRID_GPIO
+	bool "Vybrid GPIO driver"
+	depends on DM
+	default n
+	help
+	  Say yes here to support Vybrid vf610 GPIOs.
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ba9efe8..5864850 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -45,3 +45,4 @@ obj-$(CONFIG_SUNXI_GPIO)	+= sunxi_gpio.o
 obj-$(CONFIG_LPC32XX_GPIO)	+= lpc32xx_gpio.o
 obj-$(CONFIG_STM32_GPIO)	+= stm32_gpio.o
 obj-$(CONFIG_ZYNQ_GPIO)		+= zynq_gpio.o
+obj-$(CONFIG_VYBRID_GPIO)	+= vybrid_gpio.o
diff --git a/drivers/gpio/vybrid_gpio.c b/drivers/gpio/vybrid_gpio.c
new file mode 100644
index 0000000..6eaf0a9
--- /dev/null
+++ b/drivers/gpio/vybrid_gpio.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2015
+ * Bhuvanchandra DV, Toradex, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <asm/gpio.h>
+#include <asm/imx-common/iomux-v3.h>
+#include <asm/io.h>
+#include <malloc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct vybrid_gpios {
+	unsigned int chip;
+	struct vybrid_gpio_regs *reg;
+};
+
+static int vybrid_gpio_direction_input(struct udevice *dev, unsigned gpio)
+{
+	const struct vybrid_gpios *gpios = dev_get_priv(dev);
+
+	gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
+	imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_IN);
+
+	return 0;
+}
+
+static int vybrid_gpio_direction_output(struct udevice *dev, unsigned gpio,
+					 int value)
+{
+	const struct vybrid_gpios *gpios = dev_get_priv(dev);
+
+	gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
+	gpio_set_value(gpio, value);
+	imx_iomux_gpio_set_direction(gpio, VF610_GPIO_DIRECTION_OUT);
+
+	return 0;
+}
+
+static int vybrid_gpio_get_value(struct udevice *dev, unsigned gpio)
+{
+	const struct vybrid_gpios *gpios = dev_get_priv(dev);
+
+	return ((readl(&gpios->reg->gpio_pdir) & (1 << gpio))) ? 1 : 0;
+}
+
+static int vybrid_gpio_set_value(struct udevice *dev, unsigned gpio,
+				  int value)
+{
+	const struct vybrid_gpios *gpios = dev_get_priv(dev);
+	if (value)
+		writel((1 << gpio), &gpios->reg->gpio_psor);
+	else
+		writel((1 << gpio), &gpios->reg->gpio_pcor);
+
+	return 0;
+}
+
+static int vybrid_gpio_get_function(struct udevice *dev, unsigned gpio)
+{
+	const struct vybrid_gpios *gpios = dev_get_priv(dev);
+	u32 g_state = 0;
+
+	gpio = gpio + (gpios->chip * VYBRID_GPIO_COUNT);
+
+	imx_iomux_gpio_get_function(gpio, &g_state);
+
+	if (((g_state & (0x07 << PAD_MUX_MODE_SHIFT)) >> PAD_MUX_MODE_SHIFT) > 0)
+		return GPIOF_FUNC;
+	if (g_state & PAD_CTL_OBE_ENABLE)
+		return GPIOF_OUTPUT;
+	if (g_state & PAD_CTL_IBE_ENABLE)
+		return GPIOF_INPUT;
+	if (!(g_state & PAD_CTL_OBE_IBE_ENABLE))
+		return GPIOF_UNUSED;
+
+	return GPIOF_UNKNOWN;
+}
+
+static const struct dm_gpio_ops gpio_vybrid_ops = {
+	.direction_input	= vybrid_gpio_direction_input,
+	.direction_output	= vybrid_gpio_direction_output,
+	.get_value		= vybrid_gpio_get_value,
+	.set_value		= vybrid_gpio_set_value,
+	.get_function		= vybrid_gpio_get_function,
+};
+
+static int vybrid_gpio_probe(struct udevice *dev)
+{
+	struct vybrid_gpios *gpios = dev_get_priv(dev);
+	struct vybrid_gpio_platdata *plat = dev_get_platdata(dev);
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	uc_priv->bank_name = plat->port_name;
+	uc_priv->gpio_count = VYBRID_GPIO_COUNT;
+	gpios->reg = (struct vybrid_gpio_regs *)plat->base;
+	gpios->chip = plat->chip;
+
+	return 0;
+}
+
+static int vybrid_gpio_bind(struct udevice *dev)
+{
+	struct vybrid_gpio_platdata *plat = dev->platdata;
+	fdt_addr_t base_addr;
+
+	if (plat)
+		return 0;
+
+	base_addr = dev_get_addr(dev);
+	if (base_addr == FDT_ADDR_T_NONE)
+		return -ENODEV;
+
+	/*
+	* TODO:
+	* When every board is converted to driver model and DT is
+	* supported, this can be done by auto-alloc feature, but
+	* not using calloc to alloc memory for platdata.
+	*/
+	plat = calloc(1, sizeof(*plat));
+	if (!plat)
+		return -ENOMEM;
+
+	plat->base = base_addr;
+	plat->chip = dev->req_seq;
+	plat->port_name = fdt_get_name(gd->fdt_blob, dev->of_offset, NULL);
+	dev->platdata = plat;
+
+	return 0;
+}
+
+#ifndef CONFIG_OF_CONTROL
+static const struct vybrid_gpio_platdata vybrid_gpio[] = {
+	{0, GPIO0_BASE_ADDR, "GPIO0 "},
+	{1, GPIO1_BASE_ADDR, "GPIO1 "},
+	{2, GPIO2_BASE_ADDR, "GPIO2 "},
+	{3, GPIO3_BASE_ADDR, "GPIO3 "},
+	{4, GPIO4_BASE_ADDR, "GPIO4 "},
+};
+
+U_BOOT_DEVICES(vybrid_gpio) = {
+	{ "gpio_vybrid", &vybrid_gpio[0] },
+	{ "gpio_vybrid", &vybrid_gpio[1] },
+	{ "gpio_vybrid", &vybrid_gpio[2] },
+	{ "gpio_vybrid", &vybrid_gpio[3] },
+	{ "gpio_vybrid", &vybrid_gpio[4] },
+};
+#endif
+
+static const struct udevice_id vybrid_gpio_ids[] = {
+	{ .compatible = "fsl,vf610-gpio" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_vybrid) = {
+	.name	= "gpio_vybrid",
+	.id	= UCLASS_GPIO,
+	.ops	= &gpio_vybrid_ops,
+	.probe	= vybrid_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct vybrid_gpios),
+	.of_match = vybrid_gpio_ids,
+	.bind	= vybrid_gpio_bind,
+};