Commit 0c872ecd authored by Tom Rix's avatar Tom Rix Committed by Wolfgang Denk

OMAP3 Port kernel omap gpio interface.

Port version 2.6.27 of the linux kernel's omap gpio interface to u-boot.
The orignal source is in linux/arch/arm/plat-omap/gpio.c

See doc/README.omap3 for instructions on use.
Signed-off-by: default avatarTom Rix <Tom.Rix@windriver.com>
parent 376aee78
......@@ -29,6 +29,7 @@ SOBJS := lowlevel_init.o
COBJS += board.o
COBJS += clock.o
COBJS += gpio.o
COBJS += mem.o
COBJS += syslib.o
COBJS += sys_info.o
......
/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <common.h>
#include <asm/arch/gpio.h>
#include <asm/io.h>
#include <asm/errno.h>
static struct gpio_bank gpio_bank_34xx[6] = {
{ (void *)OMAP34XX_GPIO1_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP34XX_GPIO2_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP34XX_GPIO3_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP34XX_GPIO4_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP34XX_GPIO5_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP34XX_GPIO6_BASE, METHOD_GPIO_24XX },
};
static struct gpio_bank *gpio_bank = &gpio_bank_34xx[0];
static inline struct gpio_bank *get_gpio_bank(int gpio)
{
return &gpio_bank[gpio >> 5];
}
static inline int get_gpio_index(int gpio)
{
return gpio & 0x1f;
}
static inline int gpio_valid(int gpio)
{
if (gpio < 0)
return -1;
if (gpio < 192)
return 0;
return -1;
}
static int check_gpio(int gpio)
{
if (gpio_valid(gpio) < 0) {
printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
return -1;
}
return 0;
}
static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
{
void *reg = bank->base;
u32 l;
switch (bank->method) {
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_OE;
break;
default:
return;
}
l = __raw_readl(reg);
if (is_input)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
__raw_writel(l, reg);
}
void omap_set_gpio_direction(int gpio, int is_input)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_set_gpio_direction(bank, get_gpio_index(gpio), is_input);
}
static void _set_gpio_dataout(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 += OMAP24XX_GPIO_SETDATAOUT;
else
reg += OMAP24XX_GPIO_CLEARDATAOUT;
l = 1 << gpio;
break;
default:
printf("omap3-gpio unknown bank method %s %d\n",
__FILE__, __LINE__);
return;
}
__raw_writel(l, reg);
}
void omap_set_gpio_dataout(int gpio, int enable)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_set_gpio_dataout(bank, get_gpio_index(gpio), enable);
}
int omap_get_gpio_datain(int gpio)
{
struct gpio_bank *bank;
void *reg;
if (check_gpio(gpio) < 0)
return -EINVAL;
bank = get_gpio_bank(gpio);
reg = bank->base;
switch (bank->method) {
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_DATAIN;
break;
default:
return -EINVAL;
}
return (__raw_readl(reg)
& (1 << get_gpio_index(gpio))) != 0;
}
static void _reset_gpio(struct gpio_bank *bank, int gpio)
{
_set_gpio_direction(bank, get_gpio_index(gpio), 1);
}
int omap_request_gpio(int gpio)
{
if (check_gpio(gpio) < 0)
return -EINVAL;
return 0;
}
void omap_free_gpio(int gpio)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
_reset_gpio(bank, gpio);
}
......@@ -84,6 +84,38 @@ For all other commands see
help
Interfaces
==========
gpio
To set a bit :
if (!omap_request_gpio(N)) {
omap_set_gpio_direction(N, 0);
omap_set_gpio_dataout(N, 1);
}
To clear a bit :
if (!omap_request_gpio(N)) {
omap_set_gpio_direction(N, 0);
omap_set_gpio_dataout(N, 0);
}
To read a bit :
if (!omap_request_gpio(N)) {
omap_set_gpio_direction(NULL, 1);
val = omap_get_gpio_datain(N);
omap_free_gpio(N);
}
if (val)
printf("GPIO N is set\n");
else
printf("GPIO N is clear\n");
Acknowledgements
================
......
/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _GPIO_H
#define _GPIO_H
#define OMAP24XX_GPIO_REVISION 0x0000
#define OMAP24XX_GPIO_SYSCONFIG 0x0010
#define OMAP24XX_GPIO_SYSSTATUS 0x0014
#define OMAP24XX_GPIO_IRQSTATUS1 0x0018
#define OMAP24XX_GPIO_IRQSTATUS2 0x0028
#define OMAP24XX_GPIO_IRQENABLE2 0x002c
#define OMAP24XX_GPIO_IRQENABLE1 0x001c
#define OMAP24XX_GPIO_WAKE_EN 0x0020
#define OMAP24XX_GPIO_CTRL 0x0030
#define OMAP24XX_GPIO_OE 0x0034
#define OMAP24XX_GPIO_DATAIN 0x0038
#define OMAP24XX_GPIO_DATAOUT 0x003c
#define OMAP24XX_GPIO_LEVELDETECT0 0x0040
#define OMAP24XX_GPIO_LEVELDETECT1 0x0044
#define OMAP24XX_GPIO_RISINGDETECT 0x0048
#define OMAP24XX_GPIO_FALLINGDETECT 0x004c
#define OMAP24XX_GPIO_DEBOUNCE_EN 0x0050
#define OMAP24XX_GPIO_DEBOUNCE_VAL 0x0054
#define OMAP24XX_GPIO_CLEARIRQENABLE1 0x0060
#define OMAP24XX_GPIO_SETIRQENABLE1 0x0064
#define OMAP24XX_GPIO_CLEARWKUENA 0x0080
#define OMAP24XX_GPIO_SETWKUENA 0x0084
#define OMAP24XX_GPIO_CLEARDATAOUT 0x0090
#define OMAP24XX_GPIO_SETDATAOUT 0x0094
struct gpio_bank {
void *base;
int method;
};
#define METHOD_GPIO_24XX 4
/* This is the interface */
/* Request a gpio before using it */
int omap_request_gpio(int gpio);
/* Reset and free a gpio after using it */
void omap_free_gpio(int gpio);
/* Sets the gpio as input or output */
void omap_set_gpio_direction(int gpio, int is_input);
/* Set or clear a gpio output */
void omap_set_gpio_dataout(int gpio, int enable);
/* Get the value of a gpio input */
int omap_get_gpio_datain(int gpio);
#endif /* _GPIO_H_ */
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