PCI DMA_MR Problem

PCI DMA_MR Problem

[jimmy liu]

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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RE: PCI DMA_MR Problem

[Liu Dave-r63238]

The memory map configuration registers is little-endain. Be careful this
Please byte swap this
-Dave=20
>=20
> I got a problem when I set the pci dmamr for MPC8250 for DMA=20
> PCI transfering data on linux kernel 2.6.17.
> When I set the values for the pci_dmamr registers, then print=20
> the register values back, some bits can not be set. Did=20
> anybody know what are the problem, or I have to set other stuff.
>=20
> Thanks.
>=20
> The code like this:
>=20
> volatile cpm2_map_t *immap =3D cpm2_immr;
> immap->im_pci.pci_dmamr0 =3D 0x0042b00c;
> immap->im_pci.pci_dmamr1 =3D 0x0042b00c;
> immap->im_pci.pci_dmamr2 =3D 0x0042b00c;
> immap->im_pci.pci_dmamr3 =3D 0x0042b00c;
>=20
> printk("DMA0 MR =3D 0x%08x\n",
> immap->im_pci.pci_dmamr0);
> printk("DMA1 MR (0x%08x) =3D 0x%08x\n",
> immap->im_pci.pci_dmamr1);
> printk("DMA2 MR (0x%08x) =3D 0x%08x\n",
> immap->im_pci.pci_dmamr2);
> printk("DMA3 MR (0x%08x) =3D 0x%08x\n",
> immap->im_pci.pci_dmamr3);
>=20
> The results are following:
> DMA0 MR (0xf0010500) =3D 0x0040b000
> DMA1 MR (0xf0010580) =3D 0x0040b000
> DMA2 MR (0xf0010600) =3D 0x0040b000
> DMA3 MR (0xf0010680) =3D 0x0040b000
>=20
>=20
>=20
> __________________________________________________
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> Tired of spam?  Yahoo! Mail has the best spam protection=20
> around http://mail.yahoo.com=20
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> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>=20

RE: PCI DMA_MR Problem

[jimmy liu]

I see.

Thanks.

Jimmy

--- Liu Dave-r63238 <DaveLiu@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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> > Tired of spam?  Yahoo! Mail has the best spam
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> > around http://mail.yahoo.com 
> > _______________________________________________
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> > Linuxppc-embedded@ozlabs.org
> >
>
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> > 
> 


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