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>

2 files changed, 43 insertions, 4 deletions

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);
+}
+
 /*
  *
  */
diff --git a/include/pci.h b/include/pci.h
index 35ff1e9..d0594e3 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);