ns16550: change map_sysmem to map_physmem

Change map_sysmem() to map_physmem(,,MAP_NOCACHE). Though map_sysmem()
can be used to map system memory, it might be wrong to use it for I/O
ports.  The map_physmem() serves the same purpose to translate physical
address to virtual address with the additional flag to take care of cache
property. Most drivers use map_physmem() since I/O ports access should be
uncached. As ns16550 is a driver, it should use map_physmem() rather
than map_sysmem().

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 6433844..8d028de 100644 (file)
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -8,7 +8,6 @@
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
-#include <mapmem.h>
 #include <ns16550.h>
 #include <serial.h>
 #include <watchdog.h>
@@ -97,7 +96,7 @@ static void ns16550_writeb(NS16550_t port, int offset, int value)
        unsigned char *addr;
 
        offset *= 1 << plat->reg_shift;
-       addr = map_sysmem(plat->base, 0) + offset;
+       addr = map_physmem(plat->base, 0, MAP_NOCACHE) + 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.
@@ -111,7 +110,7 @@ static int ns16550_readb(NS16550_t port, int offset)
        unsigned char *addr;
 
        offset *= 1 << plat->reg_shift;
-       addr = map_sysmem(plat->base, 0) + offset;
+       addr = map_physmem(plat->base, 0, MAP_NOCACHE) + offset;
 
        return serial_in_shift(addr, plat->reg_shift);
 }