160 lines
3.2 KiB
C
160 lines
3.2 KiB
C
/*
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* Silicon Labs C2 port Linux support for Eurotech Duramar 2150
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*
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* Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it>
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* Copyright (c) 2008 Eurotech S.p.A. <info@eurotech.it>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/c2port.h>
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#define DATA_PORT 0x325
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#define DIR_PORT 0x326
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#define C2D (1 << 0)
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#define C2CK (1 << 1)
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static DEFINE_MUTEX(update_lock);
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/*
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* C2 port operations
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*/
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static void duramar2150_c2port_access(struct c2port_device *dev, int status)
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{
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u8 v;
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mutex_lock(&update_lock);
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v = inb(DIR_PORT);
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/* 0 = input, 1 = output */
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if (status)
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outb(v | (C2D | C2CK), DIR_PORT);
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else
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/* When access is "off" is important that both lines are set
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* as inputs or hi-impedance */
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outb(v & ~(C2D | C2CK), DIR_PORT);
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mutex_unlock(&update_lock);
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}
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static void duramar2150_c2port_c2d_dir(struct c2port_device *dev, int dir)
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{
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u8 v;
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mutex_lock(&update_lock);
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v = inb(DIR_PORT);
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if (dir)
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outb(v & ~C2D, DIR_PORT);
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else
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outb(v | C2D, DIR_PORT);
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mutex_unlock(&update_lock);
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}
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static int duramar2150_c2port_c2d_get(struct c2port_device *dev)
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{
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return inb(DATA_PORT) & C2D;
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}
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static void duramar2150_c2port_c2d_set(struct c2port_device *dev, int status)
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{
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u8 v;
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mutex_lock(&update_lock);
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v = inb(DATA_PORT);
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if (status)
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outb(v | C2D, DATA_PORT);
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else
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outb(v & ~C2D, DATA_PORT);
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mutex_unlock(&update_lock);
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}
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static void duramar2150_c2port_c2ck_set(struct c2port_device *dev, int status)
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{
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u8 v;
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mutex_lock(&update_lock);
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v = inb(DATA_PORT);
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if (status)
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outb(v | C2CK, DATA_PORT);
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else
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outb(v & ~C2CK, DATA_PORT);
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mutex_unlock(&update_lock);
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}
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static struct c2port_ops duramar2150_c2port_ops = {
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.block_size = 512, /* bytes */
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.blocks_num = 30, /* total flash size: 15360 bytes */
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.access = duramar2150_c2port_access,
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.c2d_dir = duramar2150_c2port_c2d_dir,
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.c2d_get = duramar2150_c2port_c2d_get,
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.c2d_set = duramar2150_c2port_c2d_set,
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.c2ck_set = duramar2150_c2port_c2ck_set,
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};
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static struct c2port_device *duramar2150_c2port_dev;
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/*
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* Module stuff
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*/
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static int __init duramar2150_c2port_init(void)
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{
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struct resource *res;
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int ret = 0;
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res = request_region(0x325, 2, "c2port");
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if (!res)
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return -EBUSY;
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duramar2150_c2port_dev = c2port_device_register("uc",
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&duramar2150_c2port_ops, NULL);
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if (IS_ERR(duramar2150_c2port_dev)) {
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ret = PTR_ERR(duramar2150_c2port_dev);
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goto free_region;
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}
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return 0;
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free_region:
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release_region(0x325, 2);
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return ret;
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}
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static void __exit duramar2150_c2port_exit(void)
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{
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/* Setup the GPIOs as input by default (access = 0) */
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duramar2150_c2port_access(duramar2150_c2port_dev, 0);
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c2port_device_unregister(duramar2150_c2port_dev);
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release_region(0x325, 2);
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}
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module_init(duramar2150_c2port_init);
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module_exit(duramar2150_c2port_exit);
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MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
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MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150");
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MODULE_LICENSE("GPL");
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