Merge branch 'master' of git://git.denx.de/u-boot-mips

2 files changed, 31 insertions, 2 deletions

diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index c5c9d2a42e..87495614c2 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -178,4 +178,27 @@ config SPL_OF_TRANSLATE
 	  used for the address translation. This function is faster and
 	  smaller in size than fdt_translate_address().
 
+config OF_ISA_BUS
+	bool
+	depends on OF_TRANSLATE
+	help
+	  Is this option is enabled then support for the ISA bus will
+	  be included for addresses read from DT. This is something that
+	  should be known to be required or not based upon the board
+	  being targetted, and whether or not it makes use of an ISA bus.
+
+	  The bus is matched based upon its node name equalling "isa". The
+	  busses #address-cells should equal 2, with the first cell being
+	  used to hold flags & flag 0x1 indicating that the address range
+	  should be accessed using I/O port in/out accessors. The second
+	  cell holds the offset into ISA bus address space. The #size-cells
+	  property should equal 1, and of course holds the size of the
+	  address range used by a device.
+
+	  If this option is not enabled then support for the ISA bus is
+	  not included and any such busses used in DT will be treated as
+	  typical simple-bus compatible busses. This will lead to
+	  mistranslation of device addresses, so ensure that this is
+	  enabled if your board does include an ISA bus.
+
 endmenu
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 28da9ddfd8..d7a3cf665e 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -100,7 +100,8 @@ static void ns16550_writeb(NS16550_t port, int offset, int value)
 	unsigned char *addr;
 
 	offset *= 1 << plat->reg_shift;
-	addr = map_physmem(plat->base, 0, MAP_NOCACHE) + offset;
+	addr = (unsigned char *)plat->base + offset;
+
 	/*
 	 * As far as we know it doesn't make sense to support selection of
 	 * these options at run-time, so use the existing CONFIG options.
@@ -114,7 +115,7 @@ static int ns16550_readb(NS16550_t port, int offset)
 	unsigned char *addr;
 
 	offset *= 1 << plat->reg_shift;
-	addr = map_physmem(plat->base, 0, MAP_NOCACHE) + offset;
+	addr = (unsigned char *)plat->base + offset;
 
 	return serial_in_shift(addr + plat->reg_offset, plat->reg_shift);
 }
@@ -400,7 +401,12 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
 	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;
 
+#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
 	plat->base = addr;
+#else
+	plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
+#endif
+
 	plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
 				     "reg-offset", 0);
 	plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,