Dmatest
#include <linux/module.h> #include <linux/kernel.h> /* printk() */ #include <linux/moduleparam.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <linux/fs.h> #include <linux/gfp.h> #include <linux/cdev.h> #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/mm.h> #include <linux/kdev_t.h> #include <linux/proc_fs.h> #include <linux/ioctl.h> #include <linux/slab.h> #include <linux/mempool.h> #include <linux/mm.h> #include <linux/device.h> #include <linux/kobject.h> #include <linux/sysfs.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <asm/types.h> #include <asm/io.h> #include <asm/dma-mapping.h> #define DEST_ADDRESS 0x73800000 #define SRC_ADDRESS 0x10400000 static volatile struct completion comp1; static volatile struct dma_chan *dma_chan1; static int device_mmap(struct file *file,struct vm_area_struct* vma) { int size; printk("mmap fpga\n"); size=vma->vm_end - vma->vm_start; if(remap_pfn_range(vma,vma->vm_start,DEST_ADDRESS>>PAGE_SHIFT,0x800000,vma->vm_page_prot)) return -EAGAIN; return 0; } static void dma_complete_func(void *completion) { complete(completion); } struct dma_async_tx_descriptor *tx1 = NULL; static int device_ioctl(struct inode *inode,struct file *file,int num,int param) { struct dma_device *dma_dev; enum dma_ctrl_flags flags; dma_cookie_t cookie; dma_dev = dma_chan1->device; flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_COMPL_SKIP_SRC_UNMAP; tx1 = dma_dev->device_prep_dma_memcpy(dma_chan1, DEST_ADDRESS, SRC_ADDRESS+0x40000*param, 0x40000, flags); if (!tx1) { printk("Failed to prepare DMA memcpy\n"); return -1; } init_completion(&comp1); tx1->callback = dma_complete_func; tx1->callback_param = &comp1; cookie = tx1->tx_submit(tx1); if (dma_submit_error(cookie)) { printk("Failed to do DMA tx_submit\n"); return -1; } dma_async_issue_pending(dma_chan1); wait_for_completion(&comp1); } static struct file_operations fpga_fops = { .owner = THIS_MODULE, .mmap = device_mmap, .ioctl = device_ioctl, }; static int __init hello_init (void) { dev_t fpga_dev; struct cdev *fpga_cdev; struct device *dev; dma_addr_t dm; dma_cap_mask_t mask; dma_cap_zero(mask); dma_cap_set(DMA_MEMCPY,mask); dma_chan1 = dma_request_channel(mask,0,NULL); if(dma_chan1 == 0) { printk("fpga:failed to request DMA channel\n"); } if(register_chrdev_region(MKDEV(200,0),1,"fpga")) { printk (KERN_INFO "alloc chrdev error.\n"); return -1; } fpga_cdev=cdev_alloc(); if(!fpga_cdev) { printk (KERN_INFO "cdev alloc error.\n"); return -1; } fpga_cdev->ops = &fpga_fops; fpga_cdev->owner = THIS_MODULE; if(cdev_add(fpga_cdev,MKDEV(200,0),1)) { printk (KERN_INFO "cdev add error.\n"); return -1; } printk("fpga driver loaded\n"); return 0; } late_initcall(hello_init); MODULE_LICENSE("GPL");
page revision: 1, last edited: 30 Jun 2011 16:00