137 lines
3.0 KiB
C
137 lines
3.0 KiB
C
/*
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* Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <errno.h>
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#include <init.h>
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#include <asm/io.h>
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#include <mach/ep93xx-regs.h>
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#define EP93XX_GPIO_NUM_PORTS 8
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#define EP93XX_GPIO_NUM_GPIOS (EP93XX_GPIO_NUM_PORTS * 8)
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struct gpio_port {
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uint32_t *dr;
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uint32_t *ddr;
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};
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struct gpio_port gpio_ports[EP93XX_GPIO_NUM_PORTS];
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static int ep93xx_gpio_init(void)
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{
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struct gpio_regs *gpio_regs = (struct gpio_regs *)GPIO_BASE;
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gpio_ports[0].dr = &gpio_regs->padr;
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gpio_ports[0].ddr = &gpio_regs->paddr;
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gpio_ports[1].dr = &gpio_regs->pbdr;
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gpio_ports[1].ddr = &gpio_regs->pbddr;
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gpio_ports[2].dr = &gpio_regs->pcdr;
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gpio_ports[2].ddr = &gpio_regs->pcddr;
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gpio_ports[3].dr = &gpio_regs->pddr;
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gpio_ports[3].ddr = &gpio_regs->pdddr;
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gpio_ports[4].dr = &gpio_regs->pedr;
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gpio_ports[4].ddr = &gpio_regs->peddr;
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gpio_ports[5].dr = &gpio_regs->pfdr;
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gpio_ports[5].ddr = &gpio_regs->pfddr;
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gpio_ports[6].dr = &gpio_regs->pgdr;
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gpio_ports[6].ddr = &gpio_regs->pgddr;
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gpio_ports[7].dr = &gpio_regs->phdr;
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gpio_ports[7].ddr = &gpio_regs->phddr;
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return 0;
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}
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postcore_initcall(ep93xx_gpio_init);
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static struct gpio_port *gpio_get_port(unsigned gpio)
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{
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if (gpio >= EP93XX_GPIO_NUM_GPIOS)
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return 0;
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return &gpio_ports[gpio / 8];
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}
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void gpio_set_value(unsigned gpio, int value)
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{
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struct gpio_port *port = gpio_get_port(gpio);
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const int shift = gpio % 8;
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u32 val;
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if (!port)
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return;
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val = readl(port->dr);
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if (value)
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val |= 1 << shift;
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else
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val &= ~(1 << shift);
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writel(val, port->dr);
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}
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int gpio_direction_input(unsigned gpio)
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{
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struct gpio_port *port = gpio_get_port(gpio);
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const int shift = gpio % 8;
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u32 val;
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if (!port)
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return -EINVAL;
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val = readl(port->ddr);
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val &= ~(1 << shift);
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writel(val, port->ddr);
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return 0;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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struct gpio_port *port = gpio_get_port(gpio);
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const int shift = gpio % 8;
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u32 val;
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if (!port)
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return -EINVAL;
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gpio_set_value(gpio, value);
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val = readl(port->ddr);
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val |= 1 << shift;
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writel(val, port->ddr);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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struct gpio_port *port = gpio_get_port(gpio);
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const int shift = gpio % 8;
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u32 val;
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if (!port)
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return -EINVAL;
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val = readl(port->dr);
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return val & (1 << shift) ? 1 : 0;
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}
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