From mboxrd@z Thu Jan  1 00:00:00 1970
From: pavel@denx.de (Pavel Machek)
Date: Mon, 29 Oct 2012 01:27:24 +0100
Subject: [PATCH for soc] socfpga: map uart into virtual address space so that
 early_printk() works
In-Reply-To: <201210271539.20156.arnd@arndb.de>
References: <1340805007-3313-1-git-send-email-dinguyen@altera.com>
 <201210251458.48528.arnd@arndb.de>
 <20121027115615.GC5912@elf.ucw.cz>
 <201210271539.20156.arnd@arndb.de>
Message-ID: <20121029002724.GA27891@elf.ucw.cz>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org


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>
 
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[] = {

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html