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: Tom Rix <Tom.Rix@windriver.com>
This commit is contained in:
Tom Rix
Wolfgang Denk
parent
376aee78dd
commit
0c872ecd01
@ -29,6 +29,7 @@ SOBJS := lowlevel_init.o
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COBJS += board.o
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COBJS += clock.o
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COBJS += gpio.o
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COBJS += mem.o
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COBJS += syslib.o
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COBJS += sys_info.o
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185
cpu/arm_cortexa8/omap3/gpio.c
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185
cpu/arm_cortexa8/omap3/gpio.c
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@ -0,0 +1,185 @@
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/*
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* Copyright (c) 2009 Wind River Systems, Inc.
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* Tom Rix <Tom.Rix@windriver.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* This work is derived from the linux 2.6.27 kernel source
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* To fetch, use the kernel repository
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* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
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* Use the v2.6.27 tag.
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*
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* Below is the original's header including its copyright
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*
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* linux/arch/arm/plat-omap/gpio.c
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*
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* Support functions for OMAP GPIO
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*
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* Copyright (C) 2003-2005 Nokia Corporation
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* Written by Juha Yrjölä <juha.yrjola@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <asm/arch/gpio.h>
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#include <asm/io.h>
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#include <asm/errno.h>
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static struct gpio_bank gpio_bank_34xx[6] = {
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{ (void *)OMAP34XX_GPIO1_BASE, METHOD_GPIO_24XX },
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{ (void *)OMAP34XX_GPIO2_BASE, METHOD_GPIO_24XX },
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{ (void *)OMAP34XX_GPIO3_BASE, METHOD_GPIO_24XX },
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{ (void *)OMAP34XX_GPIO4_BASE, METHOD_GPIO_24XX },
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{ (void *)OMAP34XX_GPIO5_BASE, METHOD_GPIO_24XX },
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{ (void *)OMAP34XX_GPIO6_BASE, METHOD_GPIO_24XX },
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};
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static struct gpio_bank *gpio_bank = &gpio_bank_34xx[0];
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static inline struct gpio_bank *get_gpio_bank(int gpio)
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{
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return &gpio_bank[gpio >> 5];
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}
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static inline int get_gpio_index(int gpio)
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{
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return gpio & 0x1f;
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}
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static inline int gpio_valid(int gpio)
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{
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if (gpio < 0)
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return -1;
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if (gpio < 192)
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return 0;
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return -1;
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}
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static int check_gpio(int gpio)
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{
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if (gpio_valid(gpio) < 0) {
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printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
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return -1;
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}
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return 0;
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}
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static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
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{
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void *reg = bank->base;
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u32 l;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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reg += OMAP24XX_GPIO_OE;
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break;
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default:
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return;
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}
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l = __raw_readl(reg);
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if (is_input)
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l |= 1 << gpio;
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else
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l &= ~(1 << gpio);
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__raw_writel(l, reg);
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}
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void omap_set_gpio_direction(int gpio, int is_input)
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{
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struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return;
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bank = get_gpio_bank(gpio);
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_set_gpio_direction(bank, get_gpio_index(gpio), is_input);
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}
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static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable)
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{
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void *reg = bank->base;
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u32 l = 0;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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if (enable)
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reg += OMAP24XX_GPIO_SETDATAOUT;
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else
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reg += OMAP24XX_GPIO_CLEARDATAOUT;
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l = 1 << gpio;
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break;
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default:
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printf("omap3-gpio unknown bank method %s %d\n",
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__FILE__, __LINE__);
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return;
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}
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__raw_writel(l, reg);
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}
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void omap_set_gpio_dataout(int gpio, int enable)
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{
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struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return;
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bank = get_gpio_bank(gpio);
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_set_gpio_dataout(bank, get_gpio_index(gpio), enable);
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}
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int omap_get_gpio_datain(int gpio)
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{
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struct gpio_bank *bank;
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void *reg;
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if (check_gpio(gpio) < 0)
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return -EINVAL;
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bank = get_gpio_bank(gpio);
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reg = bank->base;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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reg += OMAP24XX_GPIO_DATAIN;
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break;
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default:
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return -EINVAL;
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}
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return (__raw_readl(reg)
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& (1 << get_gpio_index(gpio))) != 0;
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}
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static void _reset_gpio(struct gpio_bank *bank, int gpio)
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{
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_set_gpio_direction(bank, get_gpio_index(gpio), 1);
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}
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int omap_request_gpio(int gpio)
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{
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if (check_gpio(gpio) < 0)
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return -EINVAL;
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return 0;
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}
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void omap_free_gpio(int gpio)
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{
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struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return;
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bank = get_gpio_bank(gpio);
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_reset_gpio(bank, gpio);
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}
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@ -84,6 +84,38 @@ For all other commands see
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help
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Interfaces
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==========
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gpio
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To set a bit :
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if (!omap_request_gpio(N)) {
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omap_set_gpio_direction(N, 0);
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omap_set_gpio_dataout(N, 1);
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}
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To clear a bit :
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if (!omap_request_gpio(N)) {
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omap_set_gpio_direction(N, 0);
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omap_set_gpio_dataout(N, 0);
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}
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To read a bit :
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if (!omap_request_gpio(N)) {
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omap_set_gpio_direction(NULL, 1);
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val = omap_get_gpio_datain(N);
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omap_free_gpio(N);
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}
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if (val)
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printf("GPIO N is set\n");
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else
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printf("GPIO N is clear\n");
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Acknowledgements
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================
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86
include/asm-arm/arch-omap3/gpio.h
Normal file
86
include/asm-arm/arch-omap3/gpio.h
Normal file
@ -0,0 +1,86 @@
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/*
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* Copyright (c) 2009 Wind River Systems, Inc.
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* Tom Rix <Tom.Rix@windriver.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* This work is derived from the linux 2.6.27 kernel source
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* To fetch, use the kernel repository
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* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
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* Use the v2.6.27 tag.
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*
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* Below is the original's header including its copyright
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*
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* linux/arch/arm/plat-omap/gpio.c
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*
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* Support functions for OMAP GPIO
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*
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* Copyright (C) 2003-2005 Nokia Corporation
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* Written by Juha Yrjölä <juha.yrjola@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _GPIO_H
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#define _GPIO_H
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#define OMAP24XX_GPIO_REVISION 0x0000
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#define OMAP24XX_GPIO_SYSCONFIG 0x0010
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#define OMAP24XX_GPIO_SYSSTATUS 0x0014
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#define OMAP24XX_GPIO_IRQSTATUS1 0x0018
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#define OMAP24XX_GPIO_IRQSTATUS2 0x0028
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#define OMAP24XX_GPIO_IRQENABLE2 0x002c
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#define OMAP24XX_GPIO_IRQENABLE1 0x001c
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#define OMAP24XX_GPIO_WAKE_EN 0x0020
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#define OMAP24XX_GPIO_CTRL 0x0030
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#define OMAP24XX_GPIO_OE 0x0034
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#define OMAP24XX_GPIO_DATAIN 0x0038
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#define OMAP24XX_GPIO_DATAOUT 0x003c
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#define OMAP24XX_GPIO_LEVELDETECT0 0x0040
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#define OMAP24XX_GPIO_LEVELDETECT1 0x0044
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#define OMAP24XX_GPIO_RISINGDETECT 0x0048
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#define OMAP24XX_GPIO_FALLINGDETECT 0x004c
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#define OMAP24XX_GPIO_DEBOUNCE_EN 0x0050
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#define OMAP24XX_GPIO_DEBOUNCE_VAL 0x0054
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#define OMAP24XX_GPIO_CLEARIRQENABLE1 0x0060
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#define OMAP24XX_GPIO_SETIRQENABLE1 0x0064
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#define OMAP24XX_GPIO_CLEARWKUENA 0x0080
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#define OMAP24XX_GPIO_SETWKUENA 0x0084
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#define OMAP24XX_GPIO_CLEARDATAOUT 0x0090
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#define OMAP24XX_GPIO_SETDATAOUT 0x0094
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struct gpio_bank {
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void *base;
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int method;
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};
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#define METHOD_GPIO_24XX 4
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/* This is the interface */
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/* Request a gpio before using it */
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int omap_request_gpio(int gpio);
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/* Reset and free a gpio after using it */
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void omap_free_gpio(int gpio);
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/* Sets the gpio as input or output */
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void omap_set_gpio_direction(int gpio, int is_input);
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/* Set or clear a gpio output */
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void omap_set_gpio_dataout(int gpio, int enable);
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/* Get the value of a gpio input */
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int omap_get_gpio_datain(int gpio);
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#endif /* _GPIO_H_ */
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