mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-29 05:18:51 +09:00
![Wolfgang Denk](/assets/img/avatar_default.png)
Unlike the other patches in this series so far, this commit fixes a ambiguity in the license terms for some OMAP files: the code was originally derived from the Linux kernel sources, where it was clearly marked as GPL-2.0 (i. e. without the "or later" part), but the U-Boot version had a GPL-2.0+ file header added, apparently without permission / relicensing from the original authors of the code. Insert a GPL-2.0 SPDX-License-Identifier to fix this. Signed-off-by: Wolfgang Denk <wd@denx.de> cc: Tom Rix <Tom.Rix@windriver.com> Cc: Tom Rini <trini@ti.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Acked-by: Tom Rini <trini@ti.com>
223 lines
3.9 KiB
C
223 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 2009 Wind River Systems, Inc.
|
|
* Tom Rix <Tom.Rix@windriver.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* 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 <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <asm/errno.h>
|
|
|
|
#define OMAP_GPIO_DIR_OUT 0
|
|
#define OMAP_GPIO_DIR_IN 1
|
|
|
|
static inline const struct gpio_bank *get_gpio_bank(int gpio)
|
|
{
|
|
return &omap_gpio_bank[gpio >> 5];
|
|
}
|
|
|
|
static inline int get_gpio_index(int gpio)
|
|
{
|
|
return gpio & 0x1f;
|
|
}
|
|
|
|
int gpio_is_valid(int gpio)
|
|
{
|
|
return (gpio >= 0) && (gpio < OMAP_MAX_GPIO);
|
|
}
|
|
|
|
static int check_gpio(int gpio)
|
|
{
|
|
if (!gpio_is_valid(gpio)) {
|
|
printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
|
|
int is_input)
|
|
{
|
|
void *reg = bank->base;
|
|
u32 l;
|
|
|
|
switch (bank->method) {
|
|
case METHOD_GPIO_24XX:
|
|
reg += OMAP_GPIO_OE;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
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;
|
|
|
|
switch (bank->method) {
|
|
case METHOD_GPIO_24XX:
|
|
reg += OMAP_GPIO_OE;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
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;
|
|
|
|
switch (bank->method) {
|
|
case METHOD_GPIO_24XX:
|
|
if (enable)
|
|
reg += OMAP_GPIO_SETDATAOUT;
|
|
else
|
|
reg += OMAP_GPIO_CLEARDATAOUT;
|
|
l = 1 << gpio;
|
|
break;
|
|
default:
|
|
printf("omap3-gpio unknown bank method %s %d\n",
|
|
__FILE__, __LINE__);
|
|
return;
|
|
}
|
|
__raw_writel(l, reg);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
void *reg;
|
|
int input;
|
|
|
|
if (check_gpio(gpio) < 0)
|
|
return -1;
|
|
bank = get_gpio_bank(gpio);
|
|
reg = bank->base;
|
|
switch (bank->method) {
|
|
case METHOD_GPIO_24XX:
|
|
input = _get_gpio_direction(bank, get_gpio_index(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;
|
|
}
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
return (__raw_readl(reg)
|
|
& (1 << get_gpio_index(gpio))) != 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|