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 --- drivers/pci/pci.c | 19 +++++++++++++++++++ include/pci.h | 28 ++++++++++++++++++++++++---- 2 files changed, 43 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e2b05d8..cb1217f 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); +} + /* * */ diff --git a/include/pci.h b/include/pci.h index 072273b..058b943 100644 --- a/include/pci.h +++ b/include/pci.h @@ -454,10 +454,29 @@ extern pci_addr_t pci_hose_phys_to_bus(struct pci_controller* hose, #define pci_bus_to_phys(dev, addr, flags) \ pci_hose_bus_to_phys(pci_bus_to_hose(PCI_BUS(dev)), (addr), (flags))
-#define pci_phys_to_mem(dev, addr) pci_phys_to_bus((dev), (addr), PCI_REGION_MEM) -#define pci_mem_to_phys(dev, addr) pci_bus_to_phys((dev), (addr), PCI_REGION_MEM) -#define pci_phys_to_io(dev, addr) pci_phys_to_bus((dev), (addr), PCI_REGION_IO) -#define pci_io_to_phys(dev, addr) pci_bus_to_phys((dev), (addr), PCI_REGION_IO) +#define pci_virt_to_bus(dev, addr, flags) \ + pci_hose_phys_to_bus(pci_bus_to_hose(PCI_BUS(dev)), \ + (virt_to_phys(addr)), (flags)) +#define pci_bus_to_virt(dev, addr, flags, len, map_flags) \ + map_physmem(pci_hose_bus_to_phys(pci_bus_to_hose(PCI_BUS(dev)), \ + (addr), (flags)), \ + (len), (map_flags)) + +#define pci_phys_to_mem(dev, addr) \ + pci_phys_to_bus((dev), (addr), PCI_REGION_MEM) +#define pci_mem_to_phys(dev, addr) \ + pci_bus_to_phys((dev), (addr), PCI_REGION_MEM) +#define pci_phys_to_io(dev, addr) pci_phys_to_bus((dev), (addr), PCI_REGION_IO) +#define pci_io_to_phys(dev, addr) pci_bus_to_phys((dev), (addr), PCI_REGION_IO) + +#define pci_virt_to_mem(dev, addr) \ + pci_virt_to_bus((dev), (addr), PCI_REGION_MEM) +#define pci_mem_to_virt(dev, addr, len, map_flags) \ + pci_bus_to_virt((dev), (addr), PCI_REGION_MEM, (len), (map_flags)) +#define pci_virt_to_io(dev, addr) \ + pci_virt_to_bus((dev), (addr), PCI_REGION_IO) +#define pci_io_to_virt(dev, addr, len, map_flags) \ + pci_bus_to_virt((dev), (addr), PCI_REGION_IO, (len), (map_flags))
extern int pci_hose_read_config_byte(struct pci_controller *hose, pci_dev_t dev, int where, u8 *val); @@ -488,6 +507,7 @@ extern int pci_hose_write_config_byte_via_dword(struct pci_controller *hose, extern int pci_hose_write_config_word_via_dword(struct pci_controller *hose, pci_dev_t dev, int where, u16 val);
+extern void *pci_map_bar(pci_dev_t pdev, int bar, int flags); extern void pci_register_hose(struct pci_controller* hose); extern struct pci_controller* pci_bus_to_hose(int bus);