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/*
* Atmel PIO4 device driver
*
* Copyright (C) 2015 Atmel Corporation
* Wenyou.Yang <wenyou.yang@atmel.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <asm/arch/hardware.h>
#include <mach/gpio.h>
#include <mach/atmel_pio4.h>
#define ATMEL_PIO4_PINS_PER_BANK 32
/*
* Register Field Definitions
*/
#define ATMEL_PIO4_CFGR_FUNC (0x7 << 0)
#define ATMEL_PIO4_CFGR_FUNC_GPIO (0x0 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_A (0x1 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_B (0x2 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_C (0x3 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_D (0x4 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_E (0x5 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_F (0x6 << 0)
#define ATMEL_PIO4_CFGR_FUNC_PERIPH_G (0x7 << 0)
#define ATMEL_PIO4_CFGR_DIR (0x1 << 8)
#define ATMEL_PIO4_CFGR_PUEN (0x1 << 9)
#define ATMEL_PIO4_CFGR_PDEN (0x1 << 10)
#define ATMEL_PIO4_CFGR_IFEN (0x1 << 12)
#define ATMEL_PIO4_CFGR_IFSCEN (0x1 << 13)
#define ATMEL_PIO4_CFGR_OPD (0x1 << 14)
#define ATMEL_PIO4_CFGR_SCHMITT (0x1 << 15)
#define ATMEL_PIO4_CFGR_DRVSTR (0x3 << 16)
#define ATMEL_PIO4_CFGR_DRVSTR_LOW0 (0x0 << 16)
#define ATMEL_PIO4_CFGR_DRVSTR_LOW1 (0x1 << 16)
#define ATMEL_PIO4_CFGR_DRVSTR_MEDIUM (0x2 << 16)
#define ATMEL_PIO4_CFGR_DRVSTR_HIGH (0x3 << 16)
#define ATMEL_PIO4_CFGR_EVTSEL (0x7 << 24)
#define ATMEL_PIO4_CFGR_EVTSEL_FALLING (0x0 << 24)
#define ATMEL_PIO4_CFGR_EVTSEL_RISING (0x1 << 24)
#define ATMEL_PIO4_CFGR_EVTSEL_BOTH (0x2 << 24)
#define ATMEL_PIO4_CFGR_EVTSEL_LOW (0x3 << 24)
#define ATMEL_PIO4_CFGR_EVTSEL_HIGH (0x4 << 24)
#define ATMEL_PIO4_CFGR_PCFS (0x1 << 29)
#define ATMEL_PIO4_CFGR_ICFS (0x1 << 30)
static struct atmel_pio4_port *atmel_pio4_port_base(u32 port)
{
struct atmel_pio4_port *base = NULL;
switch (port) {
case AT91_PIO_PORTA:
base = (struct atmel_pio4_port *)ATMEL_BASE_PIOA;
break;
case AT91_PIO_PORTB:
base = (struct atmel_pio4_port *)ATMEL_BASE_PIOB;
break;
case AT91_PIO_PORTC:
base = (struct atmel_pio4_port *)ATMEL_BASE_PIOC;
break;
case AT91_PIO_PORTD:
base = (struct atmel_pio4_port *)ATMEL_BASE_PIOD;
break;
default:
printf("Error: Atmel PIO4: Failed to get PIO base of port#%d!\n",
port);
break;
}
return base;
}
static int atmel_pio4_config_io_func(u32 port, u32 pin,
u32 func, u32 use_pullup)
{
struct atmel_pio4_port *port_base;
u32 reg, mask;
if (pin >= ATMEL_PIO4_PINS_PER_BANK)
return -ENODEV;
port_base = atmel_pio4_port_base(port);
if (!port_base)
return -ENODEV;
mask = 1 << pin;
reg = func;
reg |= use_pullup ? ATMEL_PIO4_CFGR_PUEN : 0;
writel(mask, &port_base->mskr);
writel(reg, &port_base->cfgr);
return 0;
}
int atmel_pio4_set_gpio(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_GPIO,
use_pullup);
}
int atmel_pio4_set_a_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_A,
use_pullup);
}
int atmel_pio4_set_b_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_B,
use_pullup);
}
int atmel_pio4_set_c_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_C,
use_pullup);
}
int atmel_pio4_set_d_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_D,
use_pullup);
}
int atmel_pio4_set_e_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_E,
use_pullup);
}
int atmel_pio4_set_f_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_F,
use_pullup);
}
int atmel_pio4_set_g_periph(u32 port, u32 pin, u32 use_pullup)
{
return atmel_pio4_config_io_func(port, pin,
ATMEL_PIO4_CFGR_FUNC_PERIPH_G,
use_pullup);
}
int atmel_pio4_set_pio_output(u32 port, u32 pin, u32 value)
{
struct atmel_pio4_port *port_base;
u32 reg, mask;
if (pin >= ATMEL_PIO4_PINS_PER_BANK)
return -ENODEV;
port_base = atmel_pio4_port_base(port);
if (!port_base)
return -ENODEV;
mask = 0x01 << pin;
reg = ATMEL_PIO4_CFGR_FUNC_GPIO | ATMEL_PIO4_CFGR_DIR;
writel(mask, &port_base->mskr);
writel(reg, &port_base->cfgr);
if (value)
writel(mask, &port_base->sodr);
else
writel(mask, &port_base->codr);
return 0;
}
int atmel_pio4_get_pio_input(u32 port, u32 pin)
{
struct atmel_pio4_port *port_base;
u32 reg, mask;
if (pin >= ATMEL_PIO4_PINS_PER_BANK)
return -ENODEV;
port_base = atmel_pio4_port_base(port);
if (!port_base)
return -ENODEV;
mask = 0x01 << pin;
reg = ATMEL_PIO4_CFGR_FUNC_GPIO;
writel(mask, &port_base->mskr);
writel(reg, &port_base->cfgr);
return (readl(&port_base->pdsr) & mask) ? 1 : 0;
}
#ifdef CONFIG_DM_GPIO
static int atmel_pio4_direction_input(struct udevice *dev, unsigned offset)
{
struct at91_port_platdata *plat = dev_get_platdata(dev);
struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
u32 mask = 0x01 << offset;
u32 reg = ATMEL_PIO4_CFGR_FUNC_GPIO;
writel(mask, &port_base->mskr);
writel(reg, &port_base->cfgr);
return 0;
}
static int atmel_pio4_direction_output(struct udevice *dev,
unsigned offset, int value)
{
struct at91_port_platdata *plat = dev_get_platdata(dev);
struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
u32 mask = 0x01 << offset;
u32 reg = ATMEL_PIO4_CFGR_FUNC_GPIO | ATMEL_PIO4_CFGR_DIR;
writel(mask, &port_base->mskr);
writel(reg, &port_base->cfgr);
if (value)
writel(mask, &port_base->sodr);
else
writel(mask, &port_base->codr);
return 0;
}
static int atmel_pio4_get_value(struct udevice *dev, unsigned offset)
{
struct at91_port_platdata *plat = dev_get_platdata(dev);
struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
u32 mask = 0x01 << offset;
return (readl(&port_base->pdsr) & mask) ? 1 : 0;
}
static int atmel_pio4_set_value(struct udevice *dev,
unsigned offset, int value)
{
struct at91_port_platdata *plat = dev_get_platdata(dev);
struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
u32 mask = 0x01 << offset;
if (value)
writel(mask, &port_base->sodr);
else
writel(mask, &port_base->codr);
return 0;
}
static int atmel_pio4_get_function(struct udevice *dev, unsigned offset)
{
struct at91_port_platdata *plat = dev_get_platdata(dev);
struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
u32 mask = 0x01 << offset;
writel(mask, &port_base->mskr);
return (readl(&port_base->cfgr) &
ATMEL_PIO4_CFGR_DIR) ? GPIOF_OUTPUT : GPIOF_INPUT;
}
static const struct dm_gpio_ops atmel_pio4_ops = {
.direction_input = atmel_pio4_direction_input,
.direction_output = atmel_pio4_direction_output,
.get_value = atmel_pio4_get_value,
.set_value = atmel_pio4_set_value,
.get_function = atmel_pio4_get_function,
};
static int atmel_pio4_probe(struct udevice *dev)
{
struct at91_port_platdata *plat = dev_get_platdata(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->bank_name = plat->bank_name;
uc_priv->gpio_count = ATMEL_PIO4_PINS_PER_BANK;
return 0;
}
U_BOOT_DRIVER(gpio_atmel_pio4) = {
.name = "gpio_atmel_pio4",
.id = UCLASS_GPIO,
.ops = &atmel_pio4_ops,
.probe = atmel_pio4_probe,
};
#endif
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