| /* |
| * 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 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; |
| } |
| |
| 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(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); |
| } |
| |
| void omap_set_gpio_direction(int gpio, int is_input) |
| { |
| const 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(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); |
| } |
| |
| void omap_set_gpio_dataout(int gpio, int enable) |
| { |
| const 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) |
| { |
| const 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 += OMAP_GPIO_DATAIN; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return (__raw_readl(reg) |
| & (1 << get_gpio_index(gpio))) != 0; |
| } |
| |
| int omap_get_gpio_dataout(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 += OMAP_GPIO_DATAOUT; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return (__raw_readl(reg) |
| & (1 << get_gpio_index(gpio))) != 0; |
| } |
| |
| static void _reset_gpio(const 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) |
| { |
| const struct gpio_bank *bank; |
| |
| if (check_gpio(gpio) < 0) |
| return; |
| bank = get_gpio_bank(gpio); |
| |
| _reset_gpio(bank, gpio); |
| } |