PCI DMA_MR Problem

[jimmy liu]

I see.

Thanks.

Jimmy

--- Liu Dave-r63238 <DaveLiu at freescale.com> wrote:

> The memory map configuration registers is
> little-endain. Be careful this
> Please byte swap this
> -Dave 
> > 
> > I got a problem when I set the pci dmamr for
> MPC8250 for DMA 
> > PCI transfering data on linux kernel 2.6.17.
> > When I set the values for the pci_dmamr registers,
> then print 
> > the register values back, some bits can not be
> set. Did 
> > anybody know what are the problem, or I have to
> set other stuff.
> > 
> > Thanks.
> > 
> > The code like this:
> > 
> > volatile cpm2_map_t *immap = cpm2_immr;
> > immap->im_pci.pci_dmamr0 = 0x0042b00c;
> > immap->im_pci.pci_dmamr1 = 0x0042b00c;
> > immap->im_pci.pci_dmamr2 = 0x0042b00c;
> > immap->im_pci.pci_dmamr3 = 0x0042b00c;
> > 
> > printk("DMA0 MR = 0x%08x\n",
> > immap->im_pci.pci_dmamr0);
> > printk("DMA1 MR (0x%08x) = 0x%08x\n",
> > immap->im_pci.pci_dmamr1);
> > printk("DMA2 MR (0x%08x) = 0x%08x\n",
> > immap->im_pci.pci_dmamr2);
> > printk("DMA3 MR (0x%08x) = 0x%08x\n",
> > immap->im_pci.pci_dmamr3);
> > 
> > The results are following:
> > DMA0 MR (0xf0010500) = 0x0040b000
> > DMA1 MR (0xf0010580) = 0x0040b000
> > DMA2 MR (0xf0010600) = 0x0040b000
> > DMA3 MR (0xf0010680) = 0x0040b000
> > 
> > 
> > 
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