From: "Cédric Cano" <ccano@interfaceconcept.com>
To: linux-pci@vger.kernel.org
Subject: Question: how can I get the real PCI address of a BAR?
Date: Fri, 28 Dec 2012 10:36:17 +0100 [thread overview]
Message-ID: <50DD6811.7020301@ic.fr> (raw)
Hi,
I'm writing a driver for a DMA engine on the PCI bus. My architecture is
a 36-bit PowerPC (MPC85xx).
In my DMA driver, I want to configure the DMA to transfer data to/from a
PCI device.
I get the PCI address of the device BAR with the command pci_resource_start.
This address is 36-bit but the PCI BAR of the device is 32-bit: I can't
use the 36-bit address to run the DMA.
In kernel documentations, it's advised not to directly read the BAR.
Is there a function which provides the real PCI address i.e. the one
stored in the BAR?
Thanks.
C. Cano
next reply other threads:[~2012-12-28 14:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-28 9:36 Cédric Cano [this message]
2012-12-30 19:46 ` Question: how can I get the real PCI address of a BAR? Bjorn Helgaas
2013-01-03 8:58 ` Cédric Cano
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