mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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dc3d3f1c49
it's basically also provided by ingenic and nativly based on 2.6.27, adjusted to fit into the OpenWrt-environment
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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* linux/drivers/misc/tcsm.c
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*
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* Virtual device driver with tricky appoach to manage TCSM
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*
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* Copyright (C) 2006 Ingenic Semiconductor Inc.
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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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/spinlock.h>
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#include <asm/mipsregs.h>
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#include <asm/mipsmtregs.h>
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#include <asm/irq.h>
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#include <asm/thread_info.h>
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#include <asm/uaccess.h>
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#include <asm/jzsoc.h>
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MODULE_AUTHOR("Jianli Wei<jlwei@ingenic.cn>");
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MODULE_DESCRIPTION("Virtual Driver of TCSM");
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MODULE_LICENSE("GPL");
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/*
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* fops routines
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*/
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static int tcsm_open(struct inode *inode, struct file *filp);
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static int tcsm_release(struct inode *inode, struct file *filp);
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static ssize_t tcsm_read(struct file *filp, char *buf, size_t size, loff_t *l);
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static ssize_t tcsm_write(struct file *filp, const char *buf, size_t size, loff_t *l);
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static int tcsm_ioctl (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
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static struct file_operations tcsm_fops =
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{
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open: tcsm_open,
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release: tcsm_release,
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read: tcsm_read,
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write: tcsm_write,
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ioctl: tcsm_ioctl,
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};
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static int tcsm_open(struct inode *inode, struct file *filp)
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{
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struct pt_regs *info = task_pt_regs(current);
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printk("pt_regs =%p\n", info);
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printk("cp0 status=0x%08x\n", (unsigned int)info->cp0_status);
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info->cp0_status &= ~0x10;
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info->cp0_status |= 0x08000000; // a tricky
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printk("cp0 status=0x%08x\n", (unsigned int)info->cp0_status);
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return 0;
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}
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static int tcsm_release(struct inode *inode, struct file *filp)
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{
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struct pt_regs *info = task_pt_regs(current);
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info->cp0_status |= 0x10;
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info->cp0_status &= ~0x08000000; // a tricky
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return 0;
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}
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static ssize_t tcsm_read(struct file *filp, char *buf, size_t size, loff_t *l)
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{
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printk("tcsm: read is not implemented\n");
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return -1;
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}
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static ssize_t tcsm_write(struct file *filp, const char *buf, size_t size, loff_t *l)
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{
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printk("tcsm: write is not implemented\n");
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return -1;
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}
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static int tcsm_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
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{
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int ret = 0;
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printk("tcsm: ioctl is not implemented\n");
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return ret;
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}
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static struct miscdevice tcsm_dev = {
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TCSM_MINOR,
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"tcsm",
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&tcsm_fops
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};
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/*
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* Module init and exit
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*/
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static int __init tcsm_init(void)
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{
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int ret;
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ret = misc_register(&tcsm_dev);
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if (ret < 0) {
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return ret;
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}
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printk("Virtual Driver of JZ TCSM registered\n");
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return 0;
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}
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static void __exit tcsm_exit(void)
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{
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misc_deregister(&tcsm_dev);
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}
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module_init(tcsm_init);
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module_exit(tcsm_exit);
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