linux下的fpga驱动

1、#ifndef _FPGA_H_#define _FPGA_H_#define INTMSK (0x4A000008)#define EINTMASK (0x560000A4)#define S3C2410_ENABLE_EINT8_23 (1<<5)#define S3C2410_ENABLE_EINT18 (1<<18)#undef PDEBUG /* undef it, just in case */#define DEBUG /调试时添加此行程序，实际产品中需要注释掉#ifdef DEBUG# define PDEBUG(fmt, args.) printk(

2、KERN_WARNING "fpga: " fmt, # args)#else# define PDEBUG(fmt, args.) /* not debugging: nothing */#endif#define DEVICE_NAME "FPGA"#ifndef FPGA_NR_DEVS#define FPGA_NR_DEVS 1 /*设备数*/#endif#define FPGAMEM_SIZE1024/*FPGA每次产生中断可以读取到缓存的数据大小*/#define FPGACMD_SIZE3 /*FPGA每次产生中断可以读取到缓存的数据大小*

3、/#define FPGA_ADDR_START (0x08000000) /nGCS1地址#define FPGA_ADDR_SIZE 0x30 /申请IO内存的大小#define FPGA_ADDR_DATA 0x10 /FPGA数据寄存器偏移地址#define FPGA_ADDR_CMD 0x14 /FPGA命令寄存器偏移地址/* 定义幻数 ，定义一个字符，8位，用于检测是否是这类设备，ioctl-number.txt中给出了已经使用的幻数，定义的时候注意避免冲突*/#define FPGA_IOC 'k' /* 定义命令 ，这里的命令都是unsigned int类型*/

4、#define FPGA_IOC_ALLON _IO(FPGA_IOC, 0) /#define FPGA_IOC_ALLDOWN _IO(FPGA_IOC, 1) /#define FPGA_IOC_SET _IOW(FPGA_IOC, 2, int) /#define FPGA_IOC_CLEAR _IOW(FPGA_IOC, 3, int)/#define FPGA_IOC_MAXNR 4 /定义命令的最大序列号/* Per-device (per-bank) structure */struct fpga_dev struct cdev cdev; /* The cdev struct

5、ure */ unsigned int readlength; /* 每次中断从FPGA读取数据的实际字节数 */ char bus_dataFPGAMEM_SIZE; /* 缓存从FPGA读取的数据 */ char cmd_dataFPGACMD_SIZE; /* 缓存发送给FPGA的命令 */ struct fasync_struct *async_queue;/* 异步结构体指针，用于读 */ /* . */ /* Mutexes, spinlocks, wait queues, . */ wait_queue_head_t r_wait; /* 阻塞读用的等待队列头 */ *fpga_

6、devp;#endif /* _FPGA_H_ */#include <linux/delay.h>/#include <asm/irq.h>#include <asm/io.h>#include <asm/signal.h>#include <asm-generic/siginfo.h>#include <asm/irq.h>#include <mach/regs-gpio.h>#include <mach/regs-mem.h>#include <mach/hardware.h>#i

7、nclude <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/mm.h>#include <linux/fs.h>#include <linux/irq.h>#include <linux/types.h>#include <linux/moduleparam.h>#include <linux/slab.h>

8、#include <linux/errno.h>#include <linux/ioctl.h>#include <linux/cdev.h>#include <linux/string.h>#include <linux/list.h>#include <asm/uaccess.h>#include <asm/atomic.h>#include <asm/unistd.h>#include <linux/device.h>#include <linux/ioport.h>#

9、include <linux/gpio.h>#include <linux/sched.h>#include <linux/wait.h>/#include <asm/arch-s3c2410/irqs.h>/#include <asm/arch-s3c2410/regs-gpio.h>#include "fpga.h"/#define FPGADATA (*(volatile unsigned long *)(fpga_addr + 0x10)/FPGA data/#define FPGACON (*(volat

10、ile unsigned long *)(fpga_addr + 0x08)/FPGA control/struct cdev cdev;static struct class *fpga_class;static struct device *fpga_dev;static void _iomem *fpga_addr; /FPGA在Linux中映射的虚拟地址/static struct resource *fpga_mem;static dev_t fpga_num;static volatile int ev_fpga = 0;unsigned int temp = 0;unsigned

11、 int i;static irqreturn_t fpga_interrupt(int irq, void *dev_id, struct pt_regs *regs)/disable_irq(IRQ_EINT18);/PDEBUG("read %d bytes from FPGA:n", count);for (i=0; i<FPGAMEM_SIZE/2; i+) temp = ioread16(fpga_addr+FPGA_ADDR_DATA); /从FPGA读取16位数据 fpga_devp->readlength = fpga_devp->rea

12、dlength + 2;/字节数加2/ PDEBUG("data %d:%dt",i,temp); fpga_devp->bus_data2*i+1 = temp; /将16位数据的低8位转换到字节数组中 fpga_devp->bus_data2*i = temp >> 8; /将16位数据的高8位转换到字节数组中temp = 0;ev_fpga = 1;wake_up_interruptible(&(fpga_devp->r_wait);/* 产生异步读信号 */ if (fpga_devp->async_queue)/ kil

13、l_fasync(&fpga_devp->async_queue, SIGIO, POLL_IN);return IRQ_HANDLED;static int fpga_open(struct inode *inode, struct file *file)int ret;struct fpga_dev *fpga_devp; /* Get the per-device structure that contains this cdev */ fpga_devp = container_of(inode->i_cdev, struct fpga_dev, cdev); /*

14、 Easy access to cmos_devp from rest of the entry points */ file->private_data = fpga_devp; /* Initialize some fields */ s3c2410_gpio_cfgpin(S3C2410_GPG(10), S3C2410_GPG10_EINT18);/使GPG10为中断EINT18s3c2410_gpio_pullup(S3C2410_GPG(10), 0);/禁止上拉/* 申请中断 */set_irq_type(IRQ_EINT18,IRQ_TYPE_LEVEL_LOW);/低电

15、平产生中断 ret = request_irq(IRQ_EINT18, fpga_interrupt, 0, DEVICE_NAME, (void *)NULL);if(ret) PDEBUG("request interrupt failn");return ret;/* 初始化读等待队列 */ init_waitqueue_head(&(fpga_devp->r_wait); PDEBUG("FPGA openedn"); return 0;static ssize_t fpga_read(struct file *file, char

16、 _user *buffer, size_t size, loff_t *ppos)unsigned int count = size;unsigned int ret = 0;struct fpga_dev *fpga_devp = file->private_data;/*获得设备结构体指针*/wait_event_interruptible(fpga_devp->r_wait, ev_fpga);ev_fpga = 0;/* 每次中断从FPGA读取的数据的数量不等于应用程序需要读取的数据时，返回0 */if (fpga_devp->readlength != count

17、)return 0;/*内核空间->用户空间*/ if (copy_to_user(buffer, (void*)(fpga_devp->bus_data), count) ret = - EFAULT; else ret = count; return ret;static ssize_t fpga_write(struct file *file,const char _user *buffer, size_t size, loff_t *ppos)unsigned int count = size;unsigned int tempcmd = 0;unsigned int re

18、t = 0;unsigned int i;struct fpga_dev *fpga_devp = file->private_data;/*获得设备结构体指针*/*用户空间->内核空间*/ if (copy_from_user(void*)(fpga_devp->cmd_data), buffer, count) ret = - EFAULT; else ret = count; PDEBUG("write %d bytes to FPGA:n", count); for (i=0; i<count; i+)tempcmd=fpga_devp-&g

19、t;cmd_datai;/temp=temp<<8;/temp=temp|fpga_devp->cmd_data2*i+1; iowrite16(tempcmd,fpga_addr+FPGA_ADDR_CMD); /向FPGA写入16位数据 PDEBUG("data %d:%dt",i,tempcmd);return ret;/static int fpga_fasync(int fd, struct file *file, int mode)/ struct fpga_dev *fpga_devp = file->private_data;/*获得

20、设备结构体指针*/ return fasync_helper(fd, file, mode, &fpga_devp->async_queue);/static int fpga_release(struct inode *inode, struct file *file)/fpga_fasync(-1, file, 0); /* 将文件从异步通知列表中删除 */free_irq(IRQ_EINT18,NULL);s3c2410_gpio_cfgpin(S3C2410_GPG(10), S3C2410_GPIO_INPUT); PDEBUG("FPGA closedn&q

21、uot;); return 0;/static int fpga_ioctl(/struct inode *inode, /struct file *file, /unsigned int cmd, /unsigned long arg)/int i;/int cmddata;/* 检测命令的有效性 */ if (_IOC_TYPE(cmd) != FPGA_IOC)/命令是否操作这一类设备/ return -EINVAL;/ if (_IOC_NR(cmd) > fpga_IOC_MAXNR) /命令序列号是否超出定义/ return -EINVAL;/switch(cmd) / ca

22、se fpga_IOC_ALLON:/ for(i=0; i<4; i+) / s3c2410_gpio_setpin(led_tablei, 0); /设置IO口为0,LED为全亮状态/ / break;/ / case fpga_IOC_ALLDOWN:/ for(i=0; i<4; i+) / s3c2410_gpio_setpin(led_tablei, 1); /设置IO口为1,LED为全灭状态/ / break;/ / case fpga_IOC_SET: / if (copy_from_user(&cmddata, (int *)arg, sizeof(int

23、)/ return -EFAULT;/ s3c2410_gpio_setpin(led_tablecmddata, 0);/ break;/ / case fpga_IOC_CLEAR: / if (copy_from_user(&cmddata, (int *)arg, sizeof(int)/ return -EFAULT;/ s3c2410_gpio_setpin(led_tablecmddata, 1); / break;/ /default: / return -EINVAL;/return 0;/*文件操作结构体*/static const struct file_oper

24、ations fpga_fops = .owner = THIS_MODULE,/ .ioctl = fpga_ioctl, / .llseek = fpga_llseek, .read = fpga_read, .write = fpga_write,/ .fasync = fpga_fasync, .open = fpga_open, .release = fpga_release,;static int _init fpga_init(void)int ret; struct resource *fpga_res; unsigned int oldval_bwscon; static v

25、oid *intmsk; static void *eintmask; intmsk = ioremap_nocache(INTMSK,0x0000004); eintmask = ioremap_nocache(EINTMASK,0x0000004); /* 设置S3C2410_BWSCON:数据总线宽度16bits，使用UB/LB，禁止WAIT */ oldval_bwscon = *(volatile unsigned int *)S3C2410_BWSCON; *(volatile unsigned int *)S3C2410_BWSCON) = (oldval_bwscon &

26、; (3<<5) | S3C2410_BWSCON_DW1_16 | S3C2410_BWSCON_ST1; /* 设置S3C2410_BANKCON1 */ *(volatile unsigned int *)S3C2410_BANKCON1) = 0x0300; /* 设置S3C2410_GPGCON，使GPG10为中断EINT18 */ oldval_gpgcon = *(volatile unsigned int *)S3C2410_GPGCON;/ *(volatile unsigned int *)S3C2410_GPGCON = oldval_gpgcon | S3C

27、2410_GPG10_EINT18; /* 设置S3C2410_GPGUP，禁止GPG10上拉 */ oldval_gpgup = *(volatile unsigned int *)S3C2410_GPGUP;/ *(volatile unsigned int *)S3C2410_GPGUP = oldval_gpgup | S3C2410_GPG_PUPDIS(10); /* 设置INTMSK,使能中断EINT8_23 */ writel(readl(intmsk) & S3C2410_ENABLE_EINT8_23,intmsk); /* 设置EINTMASK,使能中断EINT1

28、8 */ writel(readl(eintmask) & S3C2410_ENABLE_EINT18,eintmask); / val |= S3C2410_BWSCON_DW2_16;/ S3C2410_BWSCON = S3C2410_BWSCON | (0x02<<7); / _raw_writel(val, S3C2410_BWSCON); /设置bank2的数据总线为16位宽度/ / val = 0x2a60;/ BANKCON2 = 0x2a60; / _raw_writel(val,S3C2410_BANKCON2); /设置满足S3C2440A的nGCS时

29、序 /*动态分配设备号*/ret = alloc_chrdev_region(&fpga_num, 0, FPGA_NR_DEVS, DEVICE_NAME); if (ret < 0) PDEBUG (DEVICE_NAME"can't be registeredn"); return ret; /* 申请设备结构体内存 */ fpga_devp = kmalloc(sizeof(struct fpga_dev), GFP_KERNEL); if (!fpga_devp) /*申请失败*/ PDEBUG("request device st

30、ruct memery failn"); ret = - ENOMEM; goto fail_kmalloc; /* 清零设备缓存 */ memset(fpga_devp, 0, sizeof(struct fpga_dev);/ memset(fpga_devp->cmd_data, 0, FPGACMD_SIZE);/ memset(&(fpga_devp->readlength), 0, sizeof(unsigned int); /* 申请I/O内存 */ fpga_res = request_mem_region(FPGA_ADDR_START,FPGA

31、_ADDR_SIZE,DEVICE_NAME); if(fpga_res = NULL) PDEBUG("request io memery failn"); ret = -EINVAL; goto fail_request_mem; /* 物理地址到虚拟地址映射 */ fpga_addr = ioremap(FPGA_ADDR_START,FPGA_ADDR_SIZE); if(fpga_addr = NULL) PDEBUG("remap address failn"); ret = -ENOMEM; goto fail_ioremap; /*初始化cdev结构*/ cdev_init(&fpga_devp->cdev, &fpga_fops); fpga_devp->cdev.owner = THIS_MODULE; fpga_devp->cdev.ops = &fpga_fops; /* 注册字符设备 */ cdev_add(&fpga_devp->cdev, fpga_num, FPGA_NR_DEVS); fpga_class = class_create(THIS_MODULE,DEVICE_NAME); f