PCI Express设备驱动 (1)

Virtex®-5 FPGA Integrated Endpoint Block for PCI Express® designs.(the integrated Endpoint block embedded in Virtex-5 devices.)//头文件card.h

#include <linux/module.h>
#include <linux/init.h>       //指定初始化和清楚函数
#include <linux/fs.h>         //文件系统相关的函数和头文件
#include <linux/cdev.h>
#include <linux/pci.h>
#include <linux/interrupt.h>  // request_irq()
#include <linux/sched.h>      // #define TASK_INTERRUPTIBLE      1

/* interruptible_sleep_on / wait_event_interruptible

interruptible_sleep_on_timeout / wait_event_interruptible_timeout

wake_up_interruptible(x) */

#include <linux/wait.h>

// void writel (unsigned char data , unsigned short addr )
#include <asm/io.h>

// copy_from_user / copy_to_user
#include <asm/uaccess.h>

/* DMA Register Locations (byte offset from BAR 0) */

// EP DDR2 memory address for DMA write operation.

#define WRITE_DDR2_SA_OFFSET          0x0

// Lower 32-bit address of system memory buffer for DMA write operation.

#define    WRITE_HOST_DA_L_OFFSET     0x4

// Upper 32-bit address of system memory buffer for DMA write operation.

#define WRITE_HOST_DA_U_OFFSET        0x8

// Lower 32-bit address of system memory buffer for DMA READ operation.

#define READ_HOST_SA_L_OFFSET         0xC

// Upper 32-bit address of system memory buffer for DMA READ operation.
#define READ_HOST_SA_U_OFFSET         0x10

// EP DDR2 memory address for DMA READ operation.

#define READ_DDR2_DA_OFFSET        0x14

// Write DMA TLP Size Register(from DDR2 to mm).

#define WRITE_SIZE_OFFSET        0x18

// Read  DMA TLP Size Register(from mm to DDR2).

#define READ_SIZE_OFFSET        0x1C

// DMA Control and Status Register

#define DMA_CST_OFFSET        0x28#define WRITE_DMA_COUNTER_OFFSET    0x30    // Write  DMA Number of Completions Register#define READ_DMA_COUNTER_OFFSET     0x34    // Read  DMA Number of Completions Register#define PCI_DEVICE_ID_EP_PIPE 0x0007   // Device ID#define DEV_NAME "card007"static int card_probe(struct pci_dev *pdev, const struct pci_device_id *id);static void card_remove(struct pci_dev *pdev);static int card_open(struct inode *inode, struct file *filp);static int card_release(struct inode *inode, struct file *filp);static ssize_t card_read(struct file *file, char __user *buf, size_t count, loff_t *f_pos);static ssize_t card_write(struct file *file, const char __user *buf, size_t count, loff_t *f_pos);//static irqreturn_t card_interrupt(int irq, void * dev);