From 6e61fae4d360a1380b63e7d007b31477e366bcce Mon Sep 17 00:00:00 2001 From: Becky Bruce Date: Tue, 3 Feb 2009 18:10:50 -0600 Subject: 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 --- drivers/pci/pci.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'drivers') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 06b56b0..fffca49 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); +} + /* * */ -- cgit v1.1