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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [char/] [lcdtxt.c] - Rev 1772
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/*****************************************************************************/ /* * lcdtxt.c -- driver for a text based LCD display * * (C) Copyright 2000, greg Ungerer (gerg@moreton.com.au) */ /*****************************************************************************/ #include <linux/config.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/delay.h> #include <asm/param.h> #include <asm/coldfire.h> #include <asm/mcfsim.h> /*****************************************************************************/ /* * Define driver major number. */ #define LCDTXT_MAJOR 120 /* * Define LCD hardware address. */ #define LCDTXT_ADDR 0x30800000 /*****************************************************************************/ int lcdtxt_open(struct inode *inode, struct file *filp) { #if 0 printk("lcdtxt_open()\n"); #endif return(0); } /*****************************************************************************/ void lcdtxt_release(struct inode *inode, struct file *filp) { #if 0 printk("lcdtxt_close()\n"); #endif } /*****************************************************************************/ int lcdtxt_write(struct inode *inode, struct file *filp, const char *buf, int count) { volatile char *lcdp; char *dp; int num; #if 0 printk("lcdtxt_write(buf=%x,count=%d)\n", (int) buf, count); #endif dp = (char *) buf; lcdp = (volatile char *) LCDTXT_ADDR; for (num = count; (num >= 0); num--) { *lcdp = get_user(dp++); udelay(1); } return(count); } /*****************************************************************************/ int lcdtxt_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { int rc = 0; #if 0 switch (cmd) { default: rc = -EINVAL; break; } #endif return(rc); } /*****************************************************************************/ /* * Exported file operations structure for driver... */ struct file_operations lcdtxt_fops = { NULL, /* lseek */ NULL, /* read */ lcdtxt_write, /* write */ NULL, /* readdir */ NULL, /* poll */ lcdtxt_ioctl, /* ioctl */ NULL, /* mmap */ lcdtxt_open, /* open */ lcdtxt_release, /* release */ NULL, /* fsync */ NULL, /* fasync */ NULL, /* check_media_change */ NULL /* revalidate */ }; /*****************************************************************************/ void lcdtxt_init(void) { int rc; /* Register lcdtxt as character device */ rc = register_chrdev(LCDTXT_MAJOR, "lcdtxt", &lcdtxt_fops); if (rc < 0) { printk(KERN_WARNING "LCDTXT: can't get major %d\n", LCDTXT_MAJOR); return; } printk("LCDTXT: Copyright (C) 2000, Greg Ungerer " "(gerg@moreton.com.au)\n"); #if 0 /* Setup CS4 for our external hardware */ #ifdef CONFIG_OLDMASK *((volatile unsigned short *) (MCF_MBAR + MCFSIM_CSMR4)) = 0x0001; *((volatile unsigned short *) (MCF_MBAR + MCFSIM_CSCR4)) = 0x3d40; #else *((volatile unsigned short *) (MCF_MBAR + MCFSIM_CSAR4)) = 0x30c0; *((volatile unsigned long *) (MCF_MBAR + MCFSIM_CSMR4)) = 0x000f0001; *((volatile unsigned short *) (MCF_MBAR + MCFSIM_CSCR4)) = 0x3d40; #endif #endif } /*****************************************************************************/
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