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>

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,

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 */