pic32_gpio.c
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/*
* Copyright (c) 2015 Microchip Technology Inc
* Purna Chandra Mandal <purna.mandal@microchip.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/compat.h>
#include <mach/pic32.h>
DECLARE_GLOBAL_DATA_PTR;
/* Peripheral Pin Control */
struct pic32_reg_port {
struct pic32_reg_atomic ansel;
struct pic32_reg_atomic tris;
struct pic32_reg_atomic port;
struct pic32_reg_atomic lat;
struct pic32_reg_atomic open_drain;
struct pic32_reg_atomic cnpu;
struct pic32_reg_atomic cnpd;
struct pic32_reg_atomic cncon;
};
enum {
MICROCHIP_GPIO_DIR_OUT,
MICROCHIP_GPIO_DIR_IN,
MICROCHIP_GPIOS_PER_BANK = 16,
};
struct pic32_gpio_priv {
struct pic32_reg_port *regs;
char name[2];
};
static int pic32_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
return !!(readl(&priv->regs->port.raw) & BIT(offset));
}
static int pic32_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
int mask = BIT(offset);
if (value)
writel(mask, &priv->regs->port.set);
else
writel(mask, &priv->regs->port.clr);
return 0;
}
static int pic32_gpio_direction(struct udevice *dev, unsigned offset)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
/* pin in analog mode ? */
if (readl(&priv->regs->ansel.raw) & BIT(offset))
return -EPERM;
if (readl(&priv->regs->tris.raw) & BIT(offset))
return MICROCHIP_GPIO_DIR_IN;
else
return MICROCHIP_GPIO_DIR_OUT;
}
static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
int mask = BIT(offset);
writel(mask, &priv->regs->ansel.clr);
writel(mask, &priv->regs->tris.set);
return 0;
}
static int pic32_gpio_direction_output(struct udevice *dev,
unsigned offset, int value)
{
struct pic32_gpio_priv *priv = dev_get_priv(dev);
int mask = BIT(offset);
writel(mask, &priv->regs->ansel.clr);
writel(mask, &priv->regs->tris.clr);
pic32_gpio_set_value(dev, offset, value);
return 0;
}
static int pic32_gpio_get_function(struct udevice *dev, unsigned offset)
{
int ret = GPIOF_UNUSED;
switch (pic32_gpio_direction(dev, offset)) {
case MICROCHIP_GPIO_DIR_OUT:
ret = GPIOF_OUTPUT;
break;
case MICROCHIP_GPIO_DIR_IN:
ret = GPIOF_INPUT;
break;
default:
ret = GPIOF_UNUSED;
break;
}
return ret;
}
static const struct dm_gpio_ops gpio_pic32_ops = {
.direction_input = pic32_gpio_direction_input,
.direction_output = pic32_gpio_direction_output,
.get_value = pic32_gpio_get_value,
.set_value = pic32_gpio_set_value,
.get_function = pic32_gpio_get_function,
};
static int pic32_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct pic32_gpio_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
char *end;
int bank;
addr = fdtdec_get_addr_size(gd->fdt_blob, dev_of_offset(dev), "reg",
&size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = ioremap(addr, size);
uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK;
/* extract bank name */
end = strrchr(dev->name, '@');
bank = trailing_strtoln(dev->name, end);
priv->name[0] = 'A' + bank;
uc_priv->bank_name = priv->name;
return 0;
}
static const struct udevice_id pic32_gpio_ids[] = {
{ .compatible = "microchip,pic32mzda-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_pic32) = {
.name = "gpio_pic32",
.id = UCLASS_GPIO,
.of_match = pic32_gpio_ids,
.ops = &gpio_pic32_ops,
.probe = pic32_gpio_probe,
.priv_auto_alloc_size = sizeof(struct pic32_gpio_priv),
};