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>master
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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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|
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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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} |
@ -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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