vdma linux驱动

#include <linux/module.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>

static int __init vdma_init(void) {
    struct dma_device *device;
    struct dma_chan *chan;

    device = dma_request_channel(mask, dma_filter_fn, NULL);
    if (!device) {
        printk(KERN_ERR "Failed to request DMA channel\n");
        return -ENODEV;
    }

    chan = device->device_chans;
    if (!chan) {
        printk(KERN_ERR "No DMA channels available\n");
        dma_release_channel(chan);
        return -ENODEV;
    }

    // 配置DMA传输参数
    struct dma_async_tx_descriptor *desc;
    desc = dmaengine_prep_slave_single(chan, src_addr, dst_addr, size, DMA_DIR_SRC_TO_DST, DMA_PREP_INTERRUPT);
    if (!desc) {
        printk(KERN_ERR "Failed to prepare DMA transfer\n");
        return -ENOMEM;
    }

    dmaengine_submit(desc);
    dma_async_issue_pending(chan);

    return 0;
}

static void __exit vdma_exit(void) {
    dma_release_channel(chan);
}

module_init(vdma_init);
module_exit(vdma_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("VDMA Linux Driver");