cf.c

基于ARM9200的CF卡驱动程序

/* 
 * 8255a GPIO interface for Linux on Atmel AT91RM9200
 * Copyright (c) 2006 Ligang Wang
 * [e-mail]
 */

/* include some file */ 
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/arch/hardware.h>
#include <asm/segment.h>

#include "cf.h"


AT91PS_SYS AT91_SYS1 = (AT91PS_SYS) AT91C_VA_BASE_SYS;
static cf_information card_info;

/*
 * Read funcation for vfs
 */
ssize_t at91_cf_read(struct file * file, char *buf, size_t count, loff_t * ppos)
{
	char temp;
	int i,retval;
	unsigned short tmp_data[256];
	temp = 0;
	*((char *)(card_info.cf_addr_io_base + 2)) = 1;
	*((char *)(card_info.cf_addr_io_base + 3)) = 0;
	*((char *)(card_info.cf_addr_io_base + 4)) = 0;
	*((char *)(card_info.cf_addr_io_base + 5)) = 0;
	*((char *)(card_info.cf_addr_io_base + 6)) = 0xe0;
	*((char *)(card_info.cf_addr_io_base + 7)) = 0x20;

	 while(temp != 0x58)//(((temp>>8)&0xff) != 0x58)
	 {
	 	temp = *((char *)(card_info.cf_addr_io_base + 7));
	 	printk("Read data %04x\n", temp);
	 }

	 for(i=0;i<256;i++)
	 {
	 	tmp_data[i] =  *((unsigned short  *)(card_info.cf_addr_io_base+8));	 	
	 }
	retval = copy_to_user(buf,(char *)tmp_data,sizeof(unsigned char)*512);
	if (!retval)
		retval = sizeof(unsigned char)*512;
	return retval;
	return -1;
}

/*
 * Write funcation for vfs
 */
ssize_t at91_cf_write(struct file * file, const char * buf, size_t count, loff_t * ppos)
{
	char temp;
	int i;
	unsigned short tmp_data[256];
	int retval = 0;

	retval = copy_from_user((char *)tmp_data,buf,sizeof(unsigned char)*512);
	if (retval)
		return retval;
	temp = 0;
	*((char *)(card_info.cf_addr_io_base + 2)) = 64;
	*((char *)(card_info.cf_addr_io_base + 3)) = 0;
	*((char *)(card_info.cf_addr_io_base + 4)) = 0;
	*((char *)(card_info.cf_addr_io_base + 5)) = 0;
	*((char *)(card_info.cf_addr_io_base + 6)) = 0xe0;
	*((char *)(card_info.cf_addr_io_base + 7)) = 0x30;

	 while(temp != 0x58)//(((temp>>8)&0xff) != 0x58)
	 {
	 	temp = *((char *)(card_info.cf_addr_io_base + 7));
	 	//printk("write status data %04x\n", temp);
	 }

	 for(i=0;i<256;i++)
	 {
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	 	*((unsigned short  *)(card_info.cf_addr_io_base+8)) = tmp_data[i] ;	 	
	}
	return 512;
}		

/* open a device */
static int at91_cf_open(struct inode* inode,struct file* file)
{
	MOD_INC_USE_COUNT;
	return 0;	
}

/*
 * Handle commands from user-space.
 */
static int at91_cf_ioctl(struct inode *inode, struct file *file,
		unsigned int cmd, unsigned long arg)
{
		return 0;		
}

static void at91_cf_setiomode()
{
	char data;
	data = *(unsigned char *)(card_info.cf_addr_attrib_base + (1<<9));
	printk("data0 = %x\n",data);
	data &= 0xc0;
	data ++;
	*(unsigned char *)(card_info.cf_addr_attrib_base + (1<<9)) = data;
	data = *(unsigned char *)(card_info.cf_addr_attrib_base + (1<<9));
	printk("data1 = %x\n",data);	
}

/*
 * setup cf hardware
 */
	
static void at91_cf_setup(void)
{
	/*Enable clock and power of PIOC and PIOB. */
	AT91_SYS1->PMC_PCER = ((1<<AT91C_ID_PIOC)|(1<<AT91C_ID_PIOB)); 
	
	/*Configure PIO as CF card periph*/
	AT91_SYS1->PIOC_PDR = AT91C_PC6_NWAIT | AT91C_PC7_A23 | AT91C_PC9_A25_CFRNW | 
    	AT91C_PC10_NCS4_CFCS | AT91C_PC11_NCS5_CFCE1 | AT91C_PC12_NCS6_CFCE2;
    AT91_SYS1->PIOC_ASR = AT91C_PC6_NWAIT | AT91C_PC7_A23 | AT91C_PC9_A25_CFRNW | 
    	AT91C_PC10_NCS4_CFCS | AT91C_PC11_NCS5_CFCE1 | AT91C_PC12_NCS6_CFCE2;  /* set up for periph A */

	AT91_SYS1->PIOC_PER = AT91C_PIO_PC5;
	AT91_SYS1->PIOC_ODR = AT91C_PIO_PC5;	/* Configure as input */
	AT91_SYS1->PIOC_IER = AT91C_PIO_PC5;	/* Enable interrupt */
	AT91_SYS1->PIOC_PPUER = AT91C_PIO_PC5;
	
	AT91_SYS1->PIOB_PER = AT91C_CF_PB21_RDY;
	AT91_SYS1->PIOB_ODR = AT91C_CF_PB21_RDY;	/* Configure PB21 RDY/-BSY as input */

    AT91_SYS1->PIOB_PER = AT91C_CF_PB18_STSCHG | AT91C_CF_PB20_IOIS16 | AT91C_CF_PB21_RDY | AT91C_CF_PB5_RESET | AT91C_CF_PB6_ENABLE;  /* enable the pio */
    AT91_SYS1->PIOB_OER = AT91C_CF_PB5_RESET | AT91C_CF_PB6_ENABLE;  /* enable it */
    AT91_SYS1->PIOB_CODR = AT91C_CF_PB5_RESET | AT91C_CF_PB6_ENABLE;  /* clear it */
	/* Setup Compact Flash, enable the address range of CS4 */
    AT91_SYS1->EBI_CSA |= AT91C_EBI_CS4A_SMC_CompactFlash;//AT91C_EBI_CS4A_SMC_COMPACTFLASH;

	#define SM_RWH		(4 << 28)  /* hold time, was 2 */
	#define SM_RWS		(6 << 24)  /* setup time, was 6 */
	#define SM_TDF		(1 << 8)  /* data float time,  */
	#define SM_NWS		(32)  /* wait states, NOTE: 0=1.5, 1=2.5, etc */

	/* debug only */
	AT91_SYS1->EBI_SMC2_CSR[4] = SM_RWH | SM_RWS | AT91C_SMC2_ACSS_STANDARD |
	                      AT91C_SMC2_DBW_16 | AT91C_SMC2_BAT | AT91C_SMC2_WSEN | SM_NWS;	
	return;
}

static int at91_cf_release(struct inode* inode,struct file* file)
{
	MOD_DEC_USE_COUNT;
	return 0;
}


struct file_operations at91_cf_fops = {
	owner:       THIS_MODULE,
	write:		at91_cf_write,
	read:			at91_cf_read,
	open:     at91_cf_open,
	ioctl:		at91_cf_ioctl,
	release:  at91_cf_release,
};

static int at91_cf_probe()
{
	if ( !(AT91_SYS1->PIOC_PDSR & (AT91C_CF_PC5_CD1)))
	{
		return 0;
	}
	/*if ( (AT91_SYS1->PIOB_PDSR & AT91C_CF_PB21_RDY))
	{
		printk("CF Card Ready\n");
	}*/
	
	return -1;
}

static int at91_cf_ioremap()
{
	card_info.cf_addr_attrib_base = (unsigned long)(ioremap(CF_ADDR_ATTR_BASE, CF_IOREMAP_SIZE));
	if (check_region(card_info.cf_addr_attrib_base, CF_IOREMAP_SIZE)<0) 
		return -1; 
	request_region(card_info.cf_addr_attrib_base, CF_IOREMAP_SIZE,"cf card");

	card_info.cf_addr_io_base = (unsigned long)(ioremap(CF_ADDR_IO_BASE, CF_IOREMAP_SIZE));
	if (check_region(card_info.cf_addr_io_base, CF_IOREMAP_SIZE)<0) 
		return -1; 
	request_region(card_info.cf_addr_io_base, CF_IOREMAP_SIZE,"cf card");

	card_info.cf_addr_mem_base = (unsigned long)(ioremap(CF_ADDR_MEM_BASE, CF_IOREMAP_SIZE));
	if (check_region(card_info.cf_addr_mem_base, CF_IOREMAP_SIZE)<0) 
		return -1; 
	request_region(card_info.cf_addr_mem_base, CF_IOREMAP_SIZE,"cf card");
	
	return 0;
}

/*
 * Initialize and install cf driver
 */

static int __init at91_cf_init(void)
{

	at91_cf_setup();
	if(at91_cf_probe() == 0)
	{
		card_info.is_insert = 0;
		printk("CF Card insert\n");
	}
	else
		return -1;
	
	if(at91_cf_ioremap() == -1)
	{
		printk("CF: io remap err, the memory is busy\n");
		return -1;
	}
	at91_cf_setiomode();
	if(register_chrdev(DEV_MAJOR,"cf card",&at91_cf_fops))
	{
		printk("CF: Can not register CF card driver \n");
		return -1;
	}

	printk("CF: the CF card is working now\n");
	
	//io remap
	
	return 0;
}



/*
 * Disable and remove the 8255A driver
 */
static void __exit at91_cf_exit(void)
{
	printk("CF: at91_cf_exit has been called\n");
	unregister_chrdev(DEV_MAJOR,"cf card");
	iounmap(card_info.cf_addr_attrib_base);
	iounmap(card_info.cf_addr_io_base);
	iounmap(card_info.cf_addr_mem_base);

	return;
}

module_init(at91_cf_init);
module_exit(at91_cf_exit);

MODULE_AUTHOR("Ligang Wang");
MODULE_DESCRIPTION("AT91 rm9200 8255a driver");
MODULE_LICENSE("GPL");