mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-15 07:43:07 +00:00
7208396bbf
This reverts commit5d3a21df66, reversing changes made to56d37f1c56. Unfortunately this is causing CI failures: https://travis-ci.org/github/trini/u-boot/jobs/711313649 Signed-off-by: Tom Rini <trini@konsulko.com>
379 lines
7.7 KiB
C
379 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2009 Wind River Systems, Inc.
|
|
* Tom Rix <Tom.Rix@windriver.com>
|
|
*
|
|
* This work is derived from the linux 2.6.27 kernel source
|
|
* To fetch, use the kernel repository
|
|
* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
|
|
* Use the v2.6.27 tag.
|
|
*
|
|
* Below is the original's header including its copyright
|
|
*
|
|
* linux/arch/arm/plat-omap/gpio.c
|
|
*
|
|
* Support functions for OMAP GPIO
|
|
*
|
|
* Copyright (C) 2003-2005 Nokia Corporation
|
|
* Written by Juha Yrjölä <juha.yrjola@nokia.com>
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <fdtdec.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <linux/errno.h>
|
|
#include <malloc.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define OMAP_GPIO_DIR_OUT 0
|
|
#define OMAP_GPIO_DIR_IN 1
|
|
|
|
#if CONFIG_IS_ENABLED(DM_GPIO)
|
|
|
|
#define GPIO_PER_BANK 32
|
|
|
|
struct gpio_bank {
|
|
/* TODO(sjg@chromium.org): Can we use a struct here? */
|
|
void *base; /* address of registers in physical memory */
|
|
};
|
|
|
|
#endif
|
|
|
|
int gpio_is_valid(int gpio)
|
|
{
|
|
return (gpio >= 0) && (gpio < OMAP_MAX_GPIO);
|
|
}
|
|
|
|
static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
|
|
int is_input)
|
|
{
|
|
void *reg = bank->base;
|
|
u32 l;
|
|
|
|
reg += OMAP_GPIO_OE;
|
|
|
|
l = __raw_readl(reg);
|
|
if (is_input)
|
|
l |= 1 << gpio;
|
|
else
|
|
l &= ~(1 << gpio);
|
|
__raw_writel(l, reg);
|
|
}
|
|
|
|
/**
|
|
* Get the direction of the GPIO by reading the GPIO_OE register
|
|
* corresponding to the specified bank.
|
|
*/
|
|
static int _get_gpio_direction(const struct gpio_bank *bank, int gpio)
|
|
{
|
|
void *reg = bank->base;
|
|
u32 v;
|
|
|
|
reg += OMAP_GPIO_OE;
|
|
|
|
v = __raw_readl(reg);
|
|
|
|
if (v & (1 << gpio))
|
|
return OMAP_GPIO_DIR_IN;
|
|
else
|
|
return OMAP_GPIO_DIR_OUT;
|
|
}
|
|
|
|
static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio,
|
|
int enable)
|
|
{
|
|
void *reg = bank->base;
|
|
u32 l = 0;
|
|
|
|
if (enable)
|
|
reg += OMAP_GPIO_SETDATAOUT;
|
|
else
|
|
reg += OMAP_GPIO_CLEARDATAOUT;
|
|
|
|
l = 1 << gpio;
|
|
__raw_writel(l, reg);
|
|
}
|
|
|
|
static int _get_gpio_value(const struct gpio_bank *bank, int gpio)
|
|
{
|
|
void *reg = bank->base;
|
|
int input;
|
|
|
|
input = _get_gpio_direction(bank, gpio);
|
|
switch (input) {
|
|
case OMAP_GPIO_DIR_IN:
|
|
reg += OMAP_GPIO_DATAIN;
|
|
break;
|
|
case OMAP_GPIO_DIR_OUT:
|
|
reg += OMAP_GPIO_DATAOUT;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return (__raw_readl(reg) & (1 << gpio)) != 0;
|
|
}
|
|
|
|
#if !CONFIG_IS_ENABLED(DM_GPIO)
|
|
static inline int get_gpio_index(int gpio)
|
|
{
|
|
return gpio & 0x1f;
|
|
}
|
|
|
|
static inline const struct gpio_bank *get_gpio_bank(int gpio)
|
|
{
|
|
return &omap_gpio_bank[gpio >> 5];
|
|
}
|
|
|
|
static int check_gpio(int gpio)
|
|
{
|
|
if (!gpio_is_valid(gpio)) {
|
|
printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Set value of the specified gpio
|
|
*/
|
|
int gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
const struct gpio_bank *bank;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
bank = get_gpio_bank(gpio);
|
|
_set_gpio_dataout(bank, get_gpio_index(gpio), value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Get value of the specified gpio
|
|
*/
|
|
int gpio_get_value(unsigned gpio)
|
|
{
|
|
const struct gpio_bank *bank;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
bank = get_gpio_bank(gpio);
|
|
|
|
return _get_gpio_value(bank, get_gpio_index(gpio));
|
|
}
|
|
|
|
/**
|
|
* Set gpio direction as input
|
|
*/
|
|
int gpio_direction_input(unsigned gpio)
|
|
{
|
|
const struct gpio_bank *bank;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
|
|
bank = get_gpio_bank(gpio);
|
|
_set_gpio_direction(bank, get_gpio_index(gpio), 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Set gpio direction as output
|
|
*/
|
|
int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
const struct gpio_bank *bank;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
|
|
bank = get_gpio_bank(gpio);
|
|
_set_gpio_dataout(bank, get_gpio_index(gpio), value);
|
|
_set_gpio_direction(bank, get_gpio_index(gpio), 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Request a gpio before using it.
|
|
*
|
|
* NOTE: Argument 'label' is unused.
|
|
*/
|
|
int gpio_request(unsigned gpio, const char *label)
|
|
{
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Reset and free the gpio after using it.
|
|
*/
|
|
int gpio_free(unsigned gpio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#else /* new driver model interface CONFIG_DM_GPIO */
|
|
|
|
/* set GPIO pin 'gpio' as an input */
|
|
static int omap_gpio_direction_input(struct udevice *dev, unsigned offset)
|
|
{
|
|
struct gpio_bank *bank = dev_get_priv(dev);
|
|
|
|
/* Configure GPIO direction as input. */
|
|
_set_gpio_direction(bank, offset, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* set GPIO pin 'gpio' as an output, with polarity 'value' */
|
|
static int omap_gpio_direction_output(struct udevice *dev, unsigned offset,
|
|
int value)
|
|
{
|
|
struct gpio_bank *bank = dev_get_priv(dev);
|
|
|
|
_set_gpio_dataout(bank, offset, value);
|
|
_set_gpio_direction(bank, offset, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* read GPIO IN value of pin 'gpio' */
|
|
static int omap_gpio_get_value(struct udevice *dev, unsigned offset)
|
|
{
|
|
struct gpio_bank *bank = dev_get_priv(dev);
|
|
|
|
return _get_gpio_value(bank, offset);
|
|
}
|
|
|
|
/* write GPIO OUT value to pin 'gpio' */
|
|
static int omap_gpio_set_value(struct udevice *dev, unsigned offset,
|
|
int value)
|
|
{
|
|
struct gpio_bank *bank = dev_get_priv(dev);
|
|
|
|
_set_gpio_dataout(bank, offset, value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_gpio_get_function(struct udevice *dev, unsigned offset)
|
|
{
|
|
struct gpio_bank *bank = dev_get_priv(dev);
|
|
|
|
/* GPIOF_FUNC is not implemented yet */
|
|
if (_get_gpio_direction(bank, offset) == OMAP_GPIO_DIR_OUT)
|
|
return GPIOF_OUTPUT;
|
|
else
|
|
return GPIOF_INPUT;
|
|
}
|
|
|
|
static const struct dm_gpio_ops gpio_omap_ops = {
|
|
.direction_input = omap_gpio_direction_input,
|
|
.direction_output = omap_gpio_direction_output,
|
|
.get_value = omap_gpio_get_value,
|
|
.set_value = omap_gpio_set_value,
|
|
.get_function = omap_gpio_get_function,
|
|
};
|
|
|
|
static int omap_gpio_probe(struct udevice *dev)
|
|
{
|
|
struct gpio_bank *bank = dev_get_priv(dev);
|
|
struct omap_gpio_platdata *plat = dev_get_platdata(dev);
|
|
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
char name[18], *str;
|
|
|
|
sprintf(name, "gpio@%4x_", (unsigned int)plat->base);
|
|
str = strdup(name);
|
|
if (!str)
|
|
return -ENOMEM;
|
|
uc_priv->bank_name = str;
|
|
uc_priv->gpio_count = GPIO_PER_BANK;
|
|
bank->base = (void *)plat->base;
|
|
return 0;
|
|
}
|
|
|
|
#if !CONFIG_IS_ENABLED(OF_CONTROL)
|
|
static int omap_gpio_bind(struct udevice *dev)
|
|
{
|
|
struct omap_gpio_platdata *plat = dev_get_platdata(dev);
|
|
fdt_addr_t base_addr;
|
|
|
|
if (plat)
|
|
return 0;
|
|
|
|
base_addr = devfdt_get_addr(dev);
|
|
if (base_addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* For example am33xx_gpio uses platform data rather than device tree.
|
|
*
|
|
* NOTE: DO NOT COPY this code if you are using device tree.
|
|
*/
|
|
plat = calloc(1, sizeof(*plat));
|
|
if (!plat)
|
|
return -ENOMEM;
|
|
|
|
plat->base = base_addr;
|
|
plat->port_name = fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL);
|
|
dev->platdata = plat;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
|
|
static const struct udevice_id omap_gpio_ids[] = {
|
|
{ .compatible = "ti,omap3-gpio" },
|
|
{ .compatible = "ti,omap4-gpio" },
|
|
{ .compatible = "ti,am4372-gpio" },
|
|
{ }
|
|
};
|
|
|
|
static int omap_gpio_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct omap_gpio_platdata *plat = dev_get_platdata(dev);
|
|
fdt_addr_t addr;
|
|
|
|
addr = devfdt_get_addr(dev);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
plat->base = addr;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
U_BOOT_DRIVER(gpio_omap) = {
|
|
.name = "gpio_omap",
|
|
.id = UCLASS_GPIO,
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
|
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
|
|
.of_match = omap_gpio_ids,
|
|
.ofdata_to_platdata = of_match_ptr(omap_gpio_ofdata_to_platdata),
|
|
.platdata_auto_alloc_size = sizeof(struct omap_gpio_platdata),
|
|
#endif
|
|
#else
|
|
.bind = omap_gpio_bind,
|
|
#endif
|
|
.ops = &gpio_omap_ops,
|
|
.probe = omap_gpio_probe,
|
|
.priv_auto_alloc_size = sizeof(struct gpio_bank),
|
|
#if !CONFIG_IS_ENABLED(OF_CONTROL)
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
#endif
|
|
};
|
|
|
|
#endif /* !DM_GPIO */
|