serial: ns16550: Support ns16550 compatible pci uart devices
There are many pci uart devices which are ns16550 compatible. We can
describe them in the board dts file and use it as the U-Boot serial
console as specified in the chosen node 'stdout-path' property.
Those pci uart devices can have their register be memory-mapped, or
i/o-mapped. The driver will try to use the memory-mapped register if
the reg property in the node has an entry to describe the memory-mapped
register, otherwise i/o-mapped register will be used.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index af5beba..70c9462 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -289,7 +289,38 @@
struct ns16550_platdata *plat = dev->platdata;
fdt_addr_t addr;
+ /* try Processor Local Bus device first */
addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
+#ifdef CONFIG_PCI
+ if (addr == FDT_ADDR_T_NONE) {
+ /* then try pci device */
+ struct fdt_pci_addr pci_addr;
+ u32 bar;
+ int ret;
+
+ /* we prefer to use a memory-mapped register */
+ ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
+ FDT_PCI_SPACE_MEM32, "reg",
+ &pci_addr);
+ if (ret) {
+ /* try if there is any i/o-mapped register */
+ ret = fdtdec_get_pci_addr(gd->fdt_blob,
+ dev->of_offset,
+ FDT_PCI_SPACE_IO,
+ "reg", &pci_addr);
+ if (ret)
+ return ret;
+ }
+
+ ret = fdtdec_get_pci_bar32(gd->fdt_blob, dev->of_offset,
+ &pci_addr, &bar);
+ if (ret)
+ return ret;
+
+ addr = bar;
+ }
+#endif
+
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;