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443 lines
11 KiB
C
443 lines
11 KiB
C
/*
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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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* Copyright (C) 2005 infineon
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* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include <asm/ifxmips/ifxmips.h>
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#include <asm/ifxmips/ifxmips_ioctl.h>
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#define MAX_PORTS 2
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#define PINS_PER_PORT 16
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static unsigned int ifxmips_gpio_major = 0;
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/* TODO do we need this ? */
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static struct semaphore port_sem;
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/* TODO do we really need this ? return in a define is forbidden by coding style */
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#define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
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int
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ifxmips_port_reserve_pin (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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printk("%s : call to obseleted function\n", __func__);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_reserve_pin);
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int
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ifxmips_port_free_pin (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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printk("%s : call to obseleted function\n", __func__);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_free_pin);
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int
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ifxmips_port_set_open_drain (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OD);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_open_drain);
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int
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ifxmips_port_clear_open_drain (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OD + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OD);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
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int
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ifxmips_port_set_pudsel (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDSEL);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_pudsel);
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int
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ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDSEL + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDSEL);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
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int
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ifxmips_port_set_puden (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_PUDEN);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_puden);
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int
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ifxmips_port_clear_puden (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_PUDEN + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_PUDEN);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_puden);
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int
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ifxmips_port_set_stoff (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_STOFF);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_stoff);
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int
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ifxmips_port_clear_stoff (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_STOFF + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_STOFF);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_stoff);
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int
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ifxmips_port_set_dir_out (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_DIR);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_dir_out);
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int
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ifxmips_port_set_dir_in (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_DIR + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_DIR);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_dir_in);
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int
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ifxmips_port_set_output (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_OUT);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_output);
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int
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ifxmips_port_clear_output (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_OUT + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_OUT);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_output);
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int
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ifxmips_port_get_input (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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if (readl(IFXMIPS_GPIO_P0_IN + (port * 0x30)) & (1 << pin))
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return 0;
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else
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return 1;
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}
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EXPORT_SYMBOL(ifxmips_port_get_input);
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int
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ifxmips_port_set_altsel0 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL0);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_altsel0);
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int
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ifxmips_port_clear_altsel0 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL0);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
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int
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ifxmips_port_set_altsel1 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) | (1 << pin), IFXMIPS_GPIO_P0_ALTSEL1);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_set_altsel1);
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int
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ifxmips_port_clear_altsel1 (unsigned int port, unsigned int pin)
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{
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IFXMIPS_GPIO_SANITY;
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writel(readl(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0x30)) & ~(1 << pin), IFXMIPS_GPIO_P0_ALTSEL1);
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
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long ifxmips_port_read_procmem_helper(char* tag, u32* in_reg, char *buf)
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{
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u32 reg, bit = 0;
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unsigned int len, t;
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len = sprintf(buf, "\n%s: ", tag);
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reg = readl(in_reg);
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bit = 0x80000000;
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for (t = 0; t < 32; t++) {
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if ((reg & bit) > 0)
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len = len + sprintf(buf + len, "X");
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else
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len = len + sprintf(buf + len, " ");
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bit = bit >> 1;
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}
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return len;
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}
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int
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ifxmips_port_read_procmem (char *buf, char **start, off_t offset, int count,
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int *eof, void *data)
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{
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long len = sprintf (buf, "\nIFXMips Port Settings\n");
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len += sprintf (buf + len,
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" 3 2 1 0\n");
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len += sprintf (buf + len,
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" 10987654321098765432109876543210\n");
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len += sprintf (buf + len,
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"----------------------------------------\n");
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len += ifxmips_port_read_procmem_helper("P0-OUT", IFXMIPS_GPIO_P0_OUT, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-OUT", IFXMIPS_GPIO_P1_OUT, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-IN ", IFXMIPS_GPIO_P0_IN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-IN ", IFXMIPS_GPIO_P1_IN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-DIR", IFXMIPS_GPIO_P0_DIR, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-DIR", IFXMIPS_GPIO_P1_DIR, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-STO ", IFXMIPS_GPIO_P0_STOFF, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-STO ", IFXMIPS_GPIO_P1_STOFF, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-PUDE", IFXMIPS_GPIO_P0_PUDEN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-PUDE", IFXMIPS_GPIO_P1_PUDEN, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-OD ", IFXMIPS_GPIO_P0_OD, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-OD ", IFXMIPS_GPIO_P1_OD, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-PUDS", IFXMIPS_GPIO_P0_PUDSEL, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-PUDS", IFXMIPS_GPIO_P1_PUDSEL, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-ALT0", IFXMIPS_GPIO_P0_ALTSEL0, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-ALT0", IFXMIPS_GPIO_P1_ALTSEL0, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P0-ALT1", IFXMIPS_GPIO_P0_ALTSEL1, &buf[len]);
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len += ifxmips_port_read_procmem_helper("P1-ALT1", IFXMIPS_GPIO_P1_ALTSEL1, &buf[len]);
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len = len + sprintf (buf + len, "\n\n");
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*eof = 1;
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return len;
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}
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static int
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ifxmips_port_open (struct inode *inode, struct file *filep)
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{
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return 0;
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}
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static int
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ifxmips_port_release (struct inode *inode, struct file *filelp)
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{
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return 0;
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}
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static int
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ifxmips_port_ioctl (struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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int ret = 0;
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volatile struct ifxmips_port_ioctl_parm parm;
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if (_IOC_TYPE (cmd) != IFXMIPS_PORT_IOC_MAGIC)
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return -EINVAL;
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if (_IOC_DIR (cmd) & _IOC_WRITE) {
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if (!access_ok
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(VERIFY_READ, arg,
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sizeof (struct ifxmips_port_ioctl_parm)))
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return -EFAULT;
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ret = copy_from_user ((void *) &parm, (void *) arg,
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sizeof (struct ifxmips_port_ioctl_parm));
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}
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if (_IOC_DIR (cmd) & _IOC_READ) {
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if (!access_ok
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(VERIFY_WRITE, arg,
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sizeof (struct ifxmips_port_ioctl_parm)))
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return -EFAULT;
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}
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if (down_trylock (&port_sem) != 0)
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return -EBUSY;
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switch (cmd) {
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case IFXMIPS_PORT_IOCOD:
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if (parm.value == 0x00)
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ifxmips_port_clear_open_drain(parm.port, parm.pin);
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else
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ifxmips_port_set_open_drain(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCPUDSEL:
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if (parm.value == 0x00)
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ifxmips_port_clear_pudsel(parm.port, parm.pin);
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else
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ifxmips_port_set_pudsel(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCPUDEN:
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if (parm.value == 0x00)
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ifxmips_port_clear_puden(parm.port, parm.pin);
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else
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ifxmips_port_set_puden(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCSTOFF:
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if (parm.value == 0x00)
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ifxmips_port_clear_stoff(parm.port, parm.pin);
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else
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ifxmips_port_set_stoff(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCDIR:
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if (parm.value == 0x00)
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ifxmips_port_set_dir_in(parm.port, parm.pin);
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else
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ifxmips_port_set_dir_out(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCOUTPUT:
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if (parm.value == 0x00)
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ifxmips_port_clear_output(parm.port, parm.pin);
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else
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ifxmips_port_set_output(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCALTSEL0:
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if (parm.value == 0x00)
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ifxmips_port_clear_altsel0(parm.port, parm.pin);
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else
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ifxmips_port_set_altsel0(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCALTSEL1:
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if (parm.value == 0x00)
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ifxmips_port_clear_altsel1(parm.port, parm.pin);
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else
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ifxmips_port_set_altsel1(parm.port, parm.pin);
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break;
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case IFXMIPS_PORT_IOCINPUT:
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parm.value = ifxmips_port_get_input(parm.port, parm.pin);
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copy_to_user((void*)arg, (void*)&parm,
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sizeof(struct ifxmips_port_ioctl_parm));
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break;
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default:
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ret = -EINVAL;
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}
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up (&port_sem);
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return ret;
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}
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static struct file_operations port_fops = {
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.open = ifxmips_port_open,
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.release = ifxmips_port_release,
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.ioctl = ifxmips_port_ioctl
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};
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int __init
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ifxmips_gpio_init (void)
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{
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int retval = 0;
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sema_init (&port_sem, 1);
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ifxmips_gpio_major = register_chrdev(0, "ifxmips_gpio", &port_fops);
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if (!ifxmips_gpio_major)
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{
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printk("ifxmips-port: Error! Could not register port device. #%d\n", ifxmips_gpio_major);
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retval = -EINVAL;
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goto out;
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}
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create_proc_read_entry("ifxmips_gpio", 0, NULL,
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ifxmips_port_read_procmem, NULL);
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printk("registered ifxmips gpio driver\n");
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out:
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return retval;
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}
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void __exit
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ifxmips_gpio_exit (void)
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{
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unregister_chrdev(ifxmips_gpio_major, "ifxmips_gpio");
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remove_proc_entry("ifxmips_gpio", NULL);
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}
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module_init(ifxmips_gpio_init);
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module_exit(ifxmips_gpio_exit);
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