S3C2440 SPI驱动简单测试-白红宇

S3C2440 SPI驱动简单测试

阅读量：4052 次

发布时间：2019-05-25

本文共 5099 字，大约阅读时间需要 16 分钟。

#include <linux/irq.h>

#include <linux/miscdevice.h>

#include <linux/delay.h>

#include <asm/irq.h>

#include <linux/interrupt.h>

#include <mach/regs-gpio.h>

#include <mach/hardware.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/fs.h>

#include <linux/types.h>

#include <linux/delay.h>

#include <linux/moduleparam.h>

#include <linux/slab.h>

#include <linux/errno.h>

#include <linux/ioctl.h>

#include <linux/cdev.h>

#include <linux/string.h>

#include <linux/gpio.h>

#include <linux/device.h>

#include <asm/uaccess.h>

#include <asm/atomic.h>

#include <asm/unistd.h>

#include <linux/spinlock.h>

#include <linux/clk.h>

#include <asm/system.h>

#include <asm/signal.h>

#include <asm/io.h>

#define DBG(msg...) do{ \

if(debug)\

printk(KERN_INFO msg);\

}while(0)

static int debug=1;

static int spi_major=0;

module_param(spi_major,int,S_IRUGO);

static struct class *spi_class;

static struct semaphore sem;

//static struct clk *spi_clock;

#define DEVICE_NAME "tq2440_spi"

struct cdev spiCdev;

static DECLARE_WAIT_QUEUE_HEAD(spi_waitq);

static int ack=0;

static int spi_open(struct inode *,struct file *);

static int spi_release(struct inode *,struct file *);

static ssize_t spi_write(struct file *filp,const char *buf,size_t count,loff_t *f_ops);

static ssize_t spi_read(struct file *filp,char *buf,size_t count,loff_t *f_ops);

static ssize_t spi_ioctl(struct inode *inode,struct file *filp,unsigned int cmd,unsigned long data);

volatile unsigned long *spi_gpfcon=NULL;//GPF Part define

volatile unsigned long *spi_gpfdat=NULL;

volatile unsigned long *spi_gpfup=NULL;

volatile unsigned long *spi_gpgcon=NULL;//GPG Part define

volatile unsigned long *spi_gpgdat=NULL;

volatile unsigned long *spi_gpgup=NULL;

volatile unsigned long *s3c2440_clkcon;

volatile unsigned long *spi_spcon1;//SPI Part define

volatile unsigned long *spi_spsta1;

volatile unsigned long *spi_sppin1;

volatile unsigned long *spi_sppre1;

volatile unsigned long *spi_sptdat1;

volatile unsigned long *spi_sprdat1;

static const struct file_operations spi_fops =

{

.owner=THIS_MODULE,

.open=spi_open,

.read=spi_read,

.ioctl=spi_ioctl,

.release=spi_release,

.write=spi_write,

};

static irqreturn_t spi_interrupt(int irq,void *dev_id,struct pt_regs *regs)

{

ack=1;

DBG("irq\n");

wake_up_interruptible(&spi_waitq);

return IRQ_HANDLED;

}

static int spi_open(struct inode *inode,struct file *filp)

{

if(down_interruptible(&sem))

return -ERESTARTSYS;

filp->private_data =&spiCdev;

return 0;

}

static int spi_release(struct inode *inode,struct file *filp)

{

up(&sem);

DBG("release\n");

return 0;

}

static void writeByte(const char c)

{

*spi_sptdat1 = c;

wait_event_interruptible(spi_waitq,ack);

ack=0;

}

static char readByte(void)

{

char ch = 0;

*spi_sptdat1 = (char)0xff;

wait_event_interruptible(spi_waitq,ack);

ack=0;

ch=*spi_sprdat1;

return ch;

}

static ssize_t spi_read(struct file *filp,char __user *buf,size_t count,loff_t *f_ops)

{

char ch;

DBG("spi read!\n");

ch=readByte();

copy_to_user(buf,&ch,1);

return 1;

}

static ssize_t spi_write(struct file *filp,const char __user *buf,size_t count,loff_t *f_ops)

{

int i;

char *kbuf;

DBG("spi write!,count=%d\n",count);

kbuf=kmalloc(count,GFP_KERNEL);

if(copy_from_user(kbuf,buf,count))

{

printk("no enough memory!\n");

return -1;

}

for(i=0;i<count;i++)

{

writeByte(*kbuf);

DBG("write 0xX!\n",*kbuf);

kbuf++;

}

kfree(kbuf);

kbuf=NULL;

return count;

}

static ssize_t spi_ioctl(struct inode *inode,struct file *filp,unsigned int cmd,unsigned long data)

{

return 0;

}

static int __init spi_init(void)

{

int result;

int ret;

dev_t devno;

init_MUTEX(&sem);

if(spi_major)

{

devno = MKDEV(spi_major, 0);

result = register_chrdev_region(devno, 1, DEVICE_NAME);

}

else

{

result = alloc_chrdev_region(&devno, 0, 1, DEVICE_NAME);

spi_major = MAJOR(devno);

}

if (result < 0)

return result;

cdev_init(&spiCdev, &spi_fops);

spiCdev.owner = THIS_MODULE;

spiCdev.ops = &spi_fops;

if (cdev_add(&spiCdev, devno, 1))

printk(KERN_NOTICE "Error adding spi %d\n", 0);

s3c2440_clkcon = (unsigned long *)ioremap(0x4C00000c,3);

spi_spcon1 = (unsigned long *)ioremap(0x59000020,1);

spi_spsta1 = (unsigned long *)ioremap(0x59000024,1);

spi_sppin1 = (unsigned long *)ioremap(0x59000028,1);

spi_sppre1 = (unsigned long *)ioremap(0x5900002c,1);

spi_sptdat1 = (unsigned long *)ioremap(0x59000030,1);

spi_sprdat1 = (unsigned long *)ioremap(0x59000034,1);

*s3c2440_clkcon |=0x40000;

s3c2410_gpio_cfgpin(S3C2410_GPG5,S3C2410_GPG5_SPIMISO1);

s3c2410_gpio_cfgpin(S3C2410_GPG6,S3C2410_GPG6_SPIMOSI1);

s3c2410_gpio_cfgpin(S3C2410_GPG7,S3C2410_GPG7_SPICLK1);

s3c2410_gpio_cfgpin(S3C2410_GPG3,S3C2410_GPG3_nSS1);

s3c2410_gpio_pullup(S3C2410_GPG5,1);

s3c2410_gpio_pullup(S3C2410_GPG6,1);

s3c2410_gpio_pullup(S3C2410_GPG7,1);

writel(0x18,spi_sppre1);

iounmap (s3c2440_clkcon);

iounmap (spi_spcon1);

iounmap (spi_spsta1);

iounmap (spi_sppin1);

iounmap (spi_sppre1);

iounmap (spi_sptdat1);

iounmap (spi_sprdat1);

printk("spi_exit!\n");

}

module_init(spi_init);

module_exit(spi_exit);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("syw");

MODULE_DESCRIPTION("SPI driver for S3C2440");

转载地址：http://fnpci.baihongyu.com/

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