SPI driver code in S3C2410 + LINUX, open source to the end

Static int spi_open (struct inode * inode, struct file * file)
{
Unsigned long temp1, temp2, temp4;
Int I;
// Printk ("sppre = % lD, spcon = % lD, sppin = % LD \ n", rsppre0, rspcon0, rsppin0 );
// Printk ("clkcon = 0x % x \ n", rclkcon); // For debug
Temp4 = _ raw_readl (s3c2410_gpeup );
// Temp4 & = ~ (0x3800 );
// Temp4 | = 0x2000;
Temp4 | = 0x1800;
_ Raw_writel (temp4, s3c2410_gpeup );
Printk ("s3c2410_gpeup value 0x % x \ n" ,__ raw_readl (s3c2410_gpeup); // For debug
Temp1 = _ raw_readl (s3c2410_gpecon );
Temp1 & = 0xf03fffff;
Temp1 | = 0xa800000;
_ Raw_writel (temp1, s3c2410_gpecon );
Printk ("s3c2410_gpecon value 0x % x \ n" ,__ raw_readl (s3c2410_gpecon); // For debug
/*
Temp3 = _ raw_readl (s3c2410_gpgup );
Temp3 | = 0x04;
_ Raw_writel (temp3, s3c2410_gpgup); // spi0 CS0 poll enable
*/
Printk ("s3c2410_gpgup value 0x % x \ n" ,__ raw_readl (s3c2410_gpgup); // For debug
Temp2 = _ raw_readl (s3c2410_gpgcon );
Temp2 & = 0 xfffffdcf;
Temp2 | = 0x50;
_ Raw_writel (temp2, s3c2410_gpgcon); // For spi0 CS0

Printk ("s3c2410_gpgcon value 0x % x \ n" ,__ raw_readl (s3c2410_gpgcon); // For debug
Rclkcon | = 0x40000; // key. You must first set pclk to SPI clock; otherwise, the SPI-related registers cannot be set !!!
Rsppre0 = 0x01; // you can specify the SPI baud rate.
Rspcon0 = 0x19; // set to query mode
Rsppin0 = 0x02;
For (I = 0; I <10; I ++)
{
Rsptdat0 = 0xff;
} // Initialize the device
Return 0;
}
Static int spi_release (struct inode * inode, struct file * file)
{
Return 0;
}
Static ssize_t spi_read (struct file * file, char _ User * buffer, Long Count, loff_t * PPOs)
{
Int I, J;
Unsigned long csval, temp1;
Unsigned char * kbuf = kmalloc (count, gfp_kernel), * PTR;
If (! Kbuf)
Return-enomem;

If (copy_from_user (kbuf, buffer, count ))
Return-efault;
PTR = kbuf;

Csval = _ raw_readl (s3c2410_gpgdat); // set Cs Low
Temp1 = csval & 0 xfffffffb;
_ Raw_writel (temp1, s3c2410_gpgdat );
// Printk ("s3c2410_gpgdat value 0x % x \ n" ,__ raw_readl (s3c2410_gpgdat); // For debug

For (I = 0; I <4; I ++)
{
// Printk ("TX times: 0x % x, txdata: 0x % 2x \ n", I, PTR );
If (rspsta0 & 0x01 ))
Rsptdat0 = PTR;
For (j = 0; j <50; j ++ );
}

For (I = 3; I <count + 1; I ++) // the first character received is 0xff, Which is manually removed.
{
// Rsptdat0 = 0xff;
If (rspsta0 & 0x01 ))//{
PTR = rsprdat0;

For (j = 0; j <50; j ++ );
// Printk ("RX times: 0x % x, rxdata: 0x % 2x \ n", I, PTR );}
}

Csval = _ raw_readl (s3c2410_gpgdat); // set CS high
Temp1 = csval | 0x04;
_ Raw_writel (temp1, s3c2410_gpgdat );
// Printk ("s3c2410_gpgdat value 0x % x \ n" ,__ raw_readl (s3c2410_gpgdat); // For debug

Copy_to_user (buffer, kbuf, count );
Kfree (kbuf );
Return count;
}
Static ssize_t spi_write (struct file * file, const char _ User * buffer, Long Count, loff_t * PPOs)
{
Int I, J;
Unsigned long csval, temp1;
Unsigned char * kbuf = kmalloc (count, gfp_kernel), * PTR;
If (! Kbuf)
Return-enomem;
If (copy_from_user (kbuf, buffer, count ))
Return-efault;
PTR = kbuf;

Csval = _ raw_readl (s3c2410_gpgdat); // set Cs Low
Temp1 = csval & 0 xfffffffb;
_ Raw_writel (temp1, s3c2410_gpgdat );
// Printk ("s3c2410_gpgdat value 0x % x \ n" ,__ raw_readl (s3c2410_gpgdat); // For debug

For (I = 0; I <count; I ++)
{
// Printk ("txdata: 0x % 2x \ n", PTR );
If (rspsta0 & 0x01 ))
Rsptdat0 = PTR;

For (j = 0; j <50; j ++ );

}
// Printk ("txdata: 0x % 02x 0x % 02x 0x % 02x 0x % 02x \ n", PTR [0], PTR [1], PTR [2], PTR [3]);
// Printk ("/*******************/\ n ");
// Printk ("SPI write debug \ n ");
Csval = _ raw_readl (s3c2410_gpgdat); // set CS high
Temp1 = csval | 0x04;
_ Raw_writel (temp1, s3c2410_gpgdat );
// Printk ("s3c2410_gpgdat value 0x % x \ n" ,__ raw_readl (s3c2410_gpgdat); // For debug

Kfree (kbuf );
Return count;
}