谁知道怎么用linux-kernel/arch/arm/mach-GM下的ahb_dma.c这段代码的,再送100分

[guan323333]

RT,做DMA传输,平台是GM8180的,搞了很久都没头绪,试着照ahb_dma.c里的usage去调用,结果还是不成功:

	int error = 0;
	int size = 128;
	char src[128] = {"aaaaaaaaaaaaaccccc"};
	char dst[128] = {"bbbbbbbbbbbbbbb"};
	char * p1 = (char*)kmalloc(size,GFP_KERNEL);
	char * p2 = (char*)kmalloc(size,GFP_KERNEL);
	memcpy(p1,src,strlen(src));
	memcpy(p2,dst,strlen(dst));
	printk("p1=%p:%s   %ul\n",p1,p1,virt_to_phys(p1));
	printk("p2=%p:%s    %ul\n",p2,p2,virt_to_phys(p2));
	
	int ret=0;
		  printk("11111111111111\n");
	 ret=fa_request_ahb_dma_ch(0, "test", NULL,NULL, ch, 1)	;
	 ret=fa_ahb_dma_init(ch,0);
	 if(ret!=0)
	{
		printk("11111 error\n");
	 }
	 printk("222222222222222222\n");
	 fa_set_ahb_dma_src_params(ch, virt_to_phys(p1), AHBDMA_MASTER_0, 2,0);
	 printk("333333333333333333\n");
	 fa_set_ahb_dma_dst_params(ch, virt_to_phys(p2), AHBDMA_MASTER_0,2,0);
	 printk("4444444444444444444444\n");
	 fa_set_ahb_dma_cfg_params(ch, 0, 0, 0, 0);
	 fa_set_ahb_dma_transfer_params2( ch, AHBDMA_MASTER_0, 32, 0);
	 printk("55555555555555555555\n");
	 fa_ahb_dma_add_auto(ch, 32);
	 fa_ahb_dma_start( ch);
	 printk("6666666666666666666666666\n");
	  printk("src=%s  dst=%s\n",virt_to_phys(p1),virt_to_phys(p2));
//	 u_delay(100000);
	 fa_ahb_dma_clear_int(ch);
	 fa_ahb_dma_stop(ch);
         fa_free_ahb_dma(ch);
	kfree(p1);
	kfree(p2);

有哪位大哥知道怎么用的，再送100分哦

[erikyo]

同问，这个问题纠结了很久了。。。。。。期待大侠的指导！

[guan323333]

顶顶顶 谁来说说看啊