vybrid_gpio.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015
* Bhuvanchandra DV, Toradex, Inc.
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <asm/gpio.h>
#include <asm/mach-imx/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_odata_to_platdata(struct udevice *dev)
{
struct vybrid_gpio_platdata *plat = dev_get_platdata(dev);
fdt_addr_t base_addr;
base_addr = devfdt_get_addr(dev);
if (base_addr == FDT_ADDR_T_NONE)
return -EINVAL;
plat->base = base_addr;
plat->chip = dev->req_seq;
plat->port_name = fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL);
return 0;
}
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,
.of_match = vybrid_gpio_ids,
.ofdata_to_platdata = vybrid_gpio_odata_to_platdata,
.probe = vybrid_gpio_probe,
.priv_auto_alloc_size = sizeof(struct vybrid_gpios),
.platdata_auto_alloc_size = sizeof(struct vybrid_gpio_platdata),
};