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From: jimmy liu <jimmyzhmliu@yahoo.com>
To: Liu Dave-r63238 <DaveLiu@freescale.com>, linuxppc-embedded@ozlabs.org
Subject: RE: PCI DMA_MR Problem
Date: Mon, 14 Aug 2006 05:38:32 -0700 (PDT)	[thread overview]
Message-ID: <20060814123832.30219.qmail@web53101.mail.yahoo.com> (raw)
In-Reply-To: <995B09A8299C2C44B59866F6391D26350CD593@zch01exm21.fsl.freescale.net>

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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> > 
> 


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      reply	other threads:[~2006-08-14 12:38 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-11 13:57 PCI DMA_MR Problem jimmy liu
2006-08-14  3:53 ` Liu Dave-r63238
2006-08-14 12:38   ` jimmy liu [this message]

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