pci: Add functions to read and write a BAR address

Some PCI functions cannot be auto-configured. Add a function to set up a
fixed BAR which can be used in these situations. Also add a function to read
the current address of a BAR.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7ee21d1..3daf73c 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -366,9 +366,27 @@ phys_addr_t pci_hose_bus_to_phys(struct pci_controller* hose,
        return phys_addr;
 }
 
-/*
- *
- */
+void pci_write_bar32(struct pci_controller *hose, pci_dev_t dev, int barnum,
+                    u32 addr_and_ctrl)
+{
+       int bar;
+
+       bar = PCI_BASE_ADDRESS_0 + barnum * 4;
+       pci_hose_write_config_dword(hose, dev, bar, addr_and_ctrl);
+}
+
+u32 pci_read_bar32(struct pci_controller *hose, pci_dev_t dev, int barnum)
+{
+       u32 addr;
+       int bar;
+
+       bar = PCI_BASE_ADDRESS_0 + barnum * 4;
+       pci_hose_read_config_dword(hose, dev, bar, &addr);
+       if (addr & PCI_BASE_ADDRESS_SPACE_IO)
+               return addr & PCI_BASE_ADDRESS_IO_MASK;
+       else
+               return addr & PCI_BASE_ADDRESS_MEM_MASK;
+}
 
 int pci_hose_config_device(struct pci_controller *hose,
                           pci_dev_t dev,

diff --git a/include/pci.h b/include/pci.h
index d211351..216f448 100644 (file)
--- a/include/pci.h
+++ b/include/pci.h
@@ -678,5 +678,28 @@ extern void pci_mpc824x_init (struct pci_controller *hose);
 extern void pci_mpc85xx_init (struct pci_controller *hose);
 #endif
 
+/**
+ * pci_write_bar32() - Write the address of a BAR including control bits
+ *
+ * This writes a raw address (with control bits) to a bar
+ *
+ * @hose:      PCI hose to use
+ * @dev:       PCI device to update
+ * @barnum:    BAR number (0-5)
+ * @addr:      BAR address with control bits
+ */
+void pci_write_bar32(struct pci_controller *hose, pci_dev_t dev, int barnum,
+                    u32 addr_and_ctrl);
+
+/**
+ * pci_read_bar32() - read the address of a bar
+ *
+ * @hose:      PCI hose to use
+ * @dev:       PCI device to inspect
+ * @barnum:    BAR number (0-5)
+ * @return address of the bar, masking out any control bits
+ * */
+u32 pci_read_bar32(struct pci_controller *hose, pci_dev_t dev, int barnum);
+
 #endif /* __ASSEMBLY__ */
 #endif /* _PCI_H */