345 lines
8.7 KiB
C
345 lines
8.7 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) 2004 btxu Generate from INCA-IP project
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* Copyright (C) 2005 Jin-Sze.Sow Comments edited
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* Copyright (C) 2006 Huang Xiaogang Modification & verification on Danube chip
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* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
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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 <linux/timer.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/kobject.h>
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#include <linux/workqueue.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h>
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#include <linux/semaphore.h>
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#include <linux/gpio.h>
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#include <net/sock.h>
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#include <ifxmips.h>
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#define MAX_PORTS 2
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#define PINS_PER_PORT 16
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#define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
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#define GPIO_TO_PORT(x) ((x > 15) ? (1) : (0))
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#define GPIO_TO_GPIO(x) ((x > 15) ? (x - 16) : (x))
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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(KERN_INFO "%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(KERN_INFO "%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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_OD + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_OD + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_DIR + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_DIR + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_OUT + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_OUT + (port * 0xC));
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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 (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
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IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
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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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ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
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IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
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return 0;
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}
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EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
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static void
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ifxmips_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
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{
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int port = GPIO_TO_PORT(offset);
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int gpio = GPIO_TO_GPIO(offset);
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if(value)
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ifxmips_port_set_output(port, gpio);
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else
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ifxmips_port_clear_output(port, gpio);
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}
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static int
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ifxmips_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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int port = GPIO_TO_PORT(offset);
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int gpio = GPIO_TO_GPIO(offset);
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return ifxmips_port_get_input(port, gpio);
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}
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static int
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ifxmips_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
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{
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int port = GPIO_TO_PORT(offset);
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int gpio = GPIO_TO_GPIO(offset);
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ifxmips_port_set_open_drain(port, gpio);
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ifxmips_port_clear_altsel0(port, gpio);
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ifxmips_port_clear_altsel1(port, gpio);
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ifxmips_port_set_dir_in(port, gpio);
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return 0;
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}
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static int
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ifxmips_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
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{
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int port = GPIO_TO_PORT(offset);
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int gpio = GPIO_TO_GPIO(offset);
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ifxmips_port_clear_open_drain(port, gpio);
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ifxmips_port_clear_altsel0(port, gpio);
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ifxmips_port_clear_altsel1(port, gpio);
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ifxmips_port_set_dir_out(port, gpio);
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ifxmips_gpio_set(chip, offset, value);
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return 0;
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}
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int
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gpio_to_irq(unsigned int gpio)
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{
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return -EINVAL;
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}
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EXPORT_SYMBOL(gpio_to_irq);
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struct gpio_chip
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ifxmips_gpio_chip =
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{
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.label = "ifxmips-gpio",
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.direction_input = ifxmips_gpio_direction_input,
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.direction_output = ifxmips_gpio_direction_output,
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.get = ifxmips_gpio_get,
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.set = ifxmips_gpio_set,
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.base = 0,
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.ngpio = 32,
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};
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static int
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ifxmips_gpio_probe(struct platform_device *dev)
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{
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gpiochip_add(&ifxmips_gpio_chip);
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return 0;
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}
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static int
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ifxmips_gpio_remove(struct platform_device *pdev)
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{
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gpiochip_remove(&ifxmips_gpio_chip);
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return 0;
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}
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static struct platform_driver
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ifxmips_gpio_driver = {
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.probe = ifxmips_gpio_probe,
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.remove = ifxmips_gpio_remove,
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.driver = {
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.name = "ifxmips_gpio",
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.owner = THIS_MODULE,
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},
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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 ret = platform_driver_register(&ifxmips_gpio_driver);
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if (ret)
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printk(KERN_INFO "ifxmips_gpio : Error registering platfom driver!");
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return ret;
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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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platform_driver_unregister(&ifxmips_gpio_driver);
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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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