diff options
| author | Becky Bruce <beckyb@kernel.crashing.org> | 2009-02-03 18:10:50 -0600 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2009-02-10 00:27:13 +0100 |
| commit | 6e61fae4d360a1380b63e7d007b31477e366bcce (patch) | |
| tree | 4cbd95c1652fa3aad0ceb4a7956b33489a569bf6 /drivers | |
| parent | 2ecca3401775b125c3b9ff65766befb23989414b (diff) | |
drivers/pci: Create pci_map_bar function
It is no longer always true that the pci bus address can be
used as the virtual address for pci accesses. pci_map_bar()
is created to return the virtual address for a pci region.
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/pci.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 06b56b05f..fffca49fc 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -116,6 +116,25 @@ PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02) PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff) PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff) +/* Get a virtual address associated with a BAR region */ +void *pci_map_bar(pci_dev_t pdev, int bar, int flags) +{ + pci_addr_t pci_bus_addr; + u32 bar_response; + + /* read BAR address */ + pci_read_config_dword(pdev, bar, &bar_response); + pci_bus_addr = (pci_addr_t)(bar_response & ~0xf); + + /* + * Pass "0" as the length argument to pci_bus_to_virt. The arg + * isn't actualy used on any platform because u-boot assumes a static + * linear mapping. In the future, this could read the BAR size + * and pass that as the size if needed. + */ + return pci_bus_to_virt(pdev, pci_bus_addr, flags, 0, MAP_NOCACHE); +} + /* * */ |