mirror of
https://github.com/AsahiLinux/u-boot
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99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*
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* (C) Copyright 2009 Alessandro Rubini
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/gpio.h>
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static unsigned long gpio_base[4] = {
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NOMADIK_GPIO0_BASE,
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NOMADIK_GPIO1_BASE,
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NOMADIK_GPIO2_BASE,
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NOMADIK_GPIO3_BASE
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};
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enum gpio_registers {
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GPIO_DAT = 0x00, /* data register */
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GPIO_DATS = 0x04, /* data set */
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GPIO_DATC = 0x08, /* data clear */
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GPIO_PDIS = 0x0c, /* pull disable */
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GPIO_DIR = 0x10, /* direction */
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GPIO_DIRS = 0x14, /* direction set */
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GPIO_DIRC = 0x18, /* direction clear */
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GPIO_AFSLA = 0x20, /* alternate function select A */
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GPIO_AFSLB = 0x24, /* alternate function select B */
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};
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static inline unsigned long gpio_to_base(int gpio)
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{
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return gpio_base[gpio / 32];
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}
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static inline u32 gpio_to_bit(int gpio)
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{
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return 1 << (gpio & 0x1f);
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}
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void nmk_gpio_af(int gpio, int alternate_function)
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{
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unsigned long base = gpio_to_base(gpio);
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u32 bit = gpio_to_bit(gpio);
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u32 afunc, bfunc;
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/* alternate function is 0..3, with one bit per register */
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afunc = readl(base + GPIO_AFSLA) & ~bit;
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bfunc = readl(base + GPIO_AFSLB) & ~bit;
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if (alternate_function & 1) afunc |= bit;
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if (alternate_function & 2) bfunc |= bit;
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writel(afunc, base + GPIO_AFSLA);
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writel(bfunc, base + GPIO_AFSLB);
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}
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void nmk_gpio_dir(int gpio, int dir)
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{
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unsigned long base = gpio_to_base(gpio);
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u32 bit = gpio_to_bit(gpio);
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if (dir)
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writel(bit, base + GPIO_DIRS);
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else
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writel(bit, base + GPIO_DIRC);
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}
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void nmk_gpio_set(int gpio, int val)
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{
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unsigned long base = gpio_to_base(gpio);
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u32 bit = gpio_to_bit(gpio);
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if (val)
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writel(bit, base + GPIO_DATS);
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else
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writel(bit, base + GPIO_DATC);
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}
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int nmk_gpio_get(int gpio)
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{
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unsigned long base = gpio_to_base(gpio);
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u32 bit = gpio_to_bit(gpio);
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return readl(base + GPIO_DAT) & bit;
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}
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