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pci: fixed dm_pci_map_bar comment

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The comment now indicates that the input argument bar is a register offset,
not a BAR index.
It also mentions which BARs are supported for type 0/1 and that the
function can return 0 on error.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Alex Marginean 2019-06-07 11:24:22 +03:00 • committed by Simon Glass
parent da0fb5fdd4
commit 2204bc1bd3
1 changed files with 5 additions and 3 deletions
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8
include/pci.h
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@ -1309,12 +1309,14 @@ pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t addr,
* dm_pci_map_bar() - get a virtual address associated with a BAR region
*
* Looks up a base address register and finds the physical memory address
* that corresponds to it
* that corresponds to it.
* Can be used for 32b BARs 0-5 on type 0 functions and for 32b BARs 0-1 on
* type 1 functions.
*
* @dev: Device to check
* @bar: Bar number to read (numbered from 0)
* @bar: Bar register offset (PCI_BASE_ADDRESS_...)
* @flags: Flags for the region type (PCI_REGION_...)
* @return: pointer to the virtual address to use
* @return: pointer to the virtual address to use or 0 on error
*/
void *dm_pci_map_bar(struct udevice *dev, int bar, int flags);