[PATCH for soc] socfpga: map uart into virtual address space so that early_printk() works

[Pavel Machek]

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 at denx.de>
Acked-by: Dinh Nguyen <dinguyen at altera.com>
 
diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
index ab81ea9..49fb62b 100644
--- a/arch/arm/mach-socfpga/socfpga.c
+++ b/arch/arm/mach-socfpga/socfpga.c
@@ -37,6 +37,15 @@ 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 +60,8 @@ 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[] = {

-- 
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