Am5728 linux驱动访问DSP缓存出错

sfloat s

Prodigy 90 points

Other Parts Discussed in Thread: AM5728

最近打算用Am5728开发，需要实现arm和dsp间数据交互，打算用dsp缓存L2 ram的部分空间作为交互(空间和实时性无法用IPC)。现在用linux下模块开辟一片空间，用ioremap的方式进行读写。设备树调整如下：

dsp1: dsp@40800000 {
compatible = "ti,dra7-dsp";
reg = <0x40800000 0x40000>,

增加：

compatible = "DEMO,MemoryShare";
       reg = <0x40840000 0x4000
               0x40844000 0x4000>;
       };

linux启动后出现如下错误：

[   24.058388] omap_hwmod: mmu0_dsp2: _wait_target_disable failed
[   24.085411] omap_hwmod: mmu1_dsp1: _wait_target_disable failed
[   24.099194] omap_hwmod: mmu0_dsp1: _wait_target_disable failed

驱动代码：

of_property_read_u32_array(np, "reg", regdata, DATA_LEN);

gpWMPoint = ioremap(regdata[0] , regdata[1]);

gpRMPoint = ioremap(regdata[2] , regdata[3]);

for(i = 0 ; i < 100; i++)
    {
        *(gpWMPoint + i) = i;
        //writel(i, gpWMPoint + i);
    }

   for( i = 0; i < 10; i++)
    {
        nBuffer[i] = readl(gpRMPoint + i); //*(gpRMPoint + i);
        printk("read adress is: %x ,data is: %x \n",gpRMPoint+i, nBuffer[i]);
    }

调用：

fd = open("/dev/MShare",O_RDWR);

read(fd, unReadBuffer, BUFFER_SIZE);

write(fd,unWriteBuffer, BUFFER_SIZE );

会打印其他信息出来，感觉是操作引起异常，有时候linux会死掉。

[ 282.783395] ------------[ cut here ]------------
[ 282.783408] WARNING: CPU: 1 PID: 28 at drivers/bus/omap_l3_noc.c:147 l3_inte)
[ 282.783414] 44000000.ocp:L3 Standard Error: MASTER MPU TARGET DSP1_SDMA (Reas
[ 282.783521] Modules linked in: ShareMemory(O) bc_example(O) rpmsg_pru rpmsg_)
[ 282.783529] CPU: 1 PID: 28 Comm: irq/23-l3-app-i Tainted: G           O    41
[ 282.783532] Hardware name: Generic DRA74X (Flattened Device Tree)
[ 282.783535] Backtrace:
[ 282.783551] [<c0013100>] (dump_backtrace) from [<c00132fc>] (show_stack+0x18)
[ 282.783561] r7:c02e7a0c r6:200e0013 r5:00000000 r4:c09442b4
[ 282.783571] [<c00132e4>] (show_stack) from [<c02bb384>] (dump_stack+0x8c/0xa)
[ 282.783581] [<c02bb2f8>] (dump_stack) from [<c0034794>] (warn_slowpath_commo)
[ 282.783589] r7:c02e7a0c r6:00000093 r5:00000009 r4:ee651e28
[ 282.783598] [<c003470c>] (warn_slowpath_common) from [<c00347fc>] (warn_slow)
[ 282.783609] r8:ee60c610 r7:c082de2c r6:00000002 r5:c082dee0 r4:c082df90
[ 282.783617] [<c00347c8>] (warn_slowpath_fmt) from [<c02e7a0c>] (l3_interrupt)
[ 282.783621] r3:ee60c480 r2:c082df90
[ 282.783624] r4:80080001
[ 282.783633] [<c02e77b0>] (l3_interrupt_handler) from [<c00839d4>] (irq_force)
[ 282.783642] r10:c00839ac r9:ee60c9c0 r8:ee5ff900 r7:00000001 r6:00000000 r50
[ 282.783645] r4:ee60c9c0
[ 282.783653] [<c00839ac>] (irq_forced_thread_fn) from [<c0083d3c>] (irq_threa)
[ 282.783660] r7:00000001 r6:00000000 r5:ee650000 r4:ee60c9e4
[ 282.783668] [<c0083c18>] (irq_thread) from [<c00507cc>] (kthread+0xe4/0xfc)
[ 282.783677] r10:00000000 r9:00000000 r8:00000000 r7:c0083c18 r6:ee60c9c0 r50
[ 282.783679] r4:00000000
[ 282.783687] [<c00506e8>] (kthread) from [<c000fb10>] (ret_from_fork+0x14/0x2)
[ 282.783697] r7:00000000 r6:00000000 r5:c00506e8 r4:ee60ca00
[ 282.783699] ---[ end trace 0000000000000002 ]---