socfpga: map uart into virtual address space so that early_printk() works

Early printk code needs UART to be mapped early during
boot. early_printk() is left there during the start-up; it is useful
as our emulators are fairly slow.

Signed-off-by: Pavel Machek <pavel@denx.de>
Acked-by: Dinh Nguyen <dinguyen@altera.com>
[olof: removed redundant newlines]
Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
index ab81ea91a7c4..6732924a5fee 100644
--- a/arch/arm/mach-socfpga/socfpga.c
+++ b/arch/arm/mach-socfpga/socfpga.c
@@ -37,6 +37,13 @@ static struct map_desc scu_io_desc __initdata = {
         .type           = MT_DEVICE,
 };
 
+static struct map_desc uart_io_desc __initdata = {
+        .virtual        = 0xfec02000,
+        .pfn            = __phys_to_pfn(0xffc02000),
+        .length         = SZ_8K,
+        .type           = MT_DEVICE,
+};
+
 static void __init socfpga_scu_map_io(void)
 {
         unsigned long base;
@@ -51,6 +58,8 @@ static void __init socfpga_scu_map_io(void)
 static void __init socfpga_map_io(void)
 {
         socfpga_scu_map_io();
+        iotable_init(&uart_io_desc, 1);
+        early_printk("Early printk initialized\n");
 }
 
 const static struct of_device_id irq_match[] = {