[linux-yocto] [PATCH 14/18] axxia: Fixed earlyprintk

Charlie Paul cpaul.windriver at gmail.com
Tue Feb 18 09:26:44 PST 2014


From: Anders Berg <anders.berg at lsi.com>

Add static mapping of the UART registers for CONFIG_DEBUG_LL. Also depends on
commit 8f704b6 to fix a bug with LPAE and static mappings.

Signed-off-by: Anders Berg <anders.berg at lsi.com>
---
 arch/arm/Kconfig.debug                         |    4 ++++
 arch/arm/mach-axxia/axxia.c                    |   13 ++++++++++++
 arch/arm/mach-axxia/include/mach/debug-macro.S |   24 ++++-------------------
 arch/arm/mach-axxia/include/mach/hardware.h    |   25 +++++++++++++++++++++++-
 4 files changed, 45 insertions(+), 21 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 1d41908..2fcac9f5f 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -89,6 +89,10 @@ choice
 		bool "Kernel low-level debugging on 9263 and 9g45"
 		depends on HAVE_AT91_DBGU1
 
+	config DEBUG_LL_AXXIA_UART0
+		bool "Kernel low-level debugging via UART0"
+		depends on ARCH_AXXIA
+
 	config DEBUG_BCM2835
 		bool "Kernel low-level debugging on BCM2835 PL011 UART"
 		depends on ARCH_BCM2835
diff --git a/arch/arm/mach-axxia/axxia.c b/arch/arm/mach-axxia/axxia.c
index 9646672..55549fa 100644
--- a/arch/arm/mach-axxia/axxia.c
+++ b/arch/arm/mach-axxia/axxia.c
@@ -46,6 +46,7 @@
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
 #include <asm/hardware/cache-l2x0.h>
+#include <mach/hardware.h>
 #include <mach/timers.h>
 #include <mach/axxia-gic.h>
 #include <linux/irqchip/arm-gic.h>
@@ -62,8 +63,20 @@ static const char *axxia_dt_match[] __initconst = {
 
 static void __iomem *ssp_base;
 
+static struct map_desc axxia_static_mappings[] __initdata = {
+#ifdef CONFIG_DEBUG_LL
+	{
+		.virtual	=  AXXIA_DEBUG_UART_VIRT,
+		.pfn		= __phys_to_pfn(AXXIA_DEBUG_UART_PHYS),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE
+	},
+#endif
+};
+
 void __init axxia_dt_map_io(void)
 {
+	iotable_init(axxia_static_mappings, ARRAY_SIZE(axxia_static_mappings));
 }
 
 void __init axxia_dt_init_early(void)
diff --git a/arch/arm/mach-axxia/include/mach/debug-macro.S b/arch/arm/mach-axxia/include/mach/debug-macro.S
index 83d6670..1a28f4a 100644
--- a/arch/arm/mach-axxia/include/mach/debug-macro.S
+++ b/arch/arm/mach-axxia/include/mach/debug-macro.S
@@ -1,37 +1,21 @@
-/* arch/arm/mach-realview/include/mach/debug-macro.S
+/* arch/arm/mach-axxia/include/mach/debug-macro.S
  *
  * Debugging macro include header
  *
- *  Copyright (C) 1994-1999 Russell King
- *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
- *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 
-/*
- * -- NOTE --
- *
-*/
+#include <mach/hardware.h>
 
 #if !defined(CONFIG_ARM_LPAE)
 #error "Axxia Peripherals Are Only Accessible Using the LPAE!"
 #endif
 
-#define UART0_PHYSICAL_ADDRESS 0x0000002010080000ULL
-#define UART1_PHYSICAL_ADDRESS 0x0000002010081000ULL
-#define UART2_PHYSICAL_ADDRESS 0x0000002010082000ULL
-#define UART3_PHYSICAL_ADDRESS 0x0000002010083000ULL
-
-#define UART0_VIRTUAL_ADDRESS 0xf0080000
-#define UART1_VIRTUAL_ADDRESS 0xf0081000
-#define UART2_VIRTUAL_ADDRESS 0xf0082000
-#define UART3_VIRTUAL_ADDRESS 0xf0083000
-
 	.macro	addruart, rp, rv, tmp
-	ldr	\rp, =0x10080000
-	ldr	\rv, =0xf0080000
+	ldr	\rp, =(AXXIA_DEBUG_UART_PHYS & 0xffffffff)
+	ldr	\rv, =AXXIA_DEBUG_UART_VIRT
 	.endm
 
 #include <asm/hardware/debug-pl01x.S>
diff --git a/arch/arm/mach-axxia/include/mach/hardware.h b/arch/arm/mach-axxia/include/mach/hardware.h
index 40a8c17..2f3686e 100644
--- a/arch/arm/mach-axxia/include/mach/hardware.h
+++ b/arch/arm/mach-axxia/include/mach/hardware.h
@@ -1 +1,24 @@
-/* empty */
+/*
+ * arch/arm/mach-axxia/include/mach/hardware.h
+ *
+ * Copyright (c) 2013 LSI Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#ifndef __MACH_HARDWARE_H
+#define __MACH_HARDWARE_H
+
+#define AXXIA_UART0_PHYS       0x2010080000
+#define AXXIA_UART1_PHYS       0x2010081000
+#define AXXIA_UART2_PHYS       0x2010082000
+#define AXXIA_UART3_PHYS       0x2010083000
+
+#ifdef CONFIG_DEBUG_LL_AXXIA_UART0
+#define AXXIA_DEBUG_UART_VIRT  0xf0080000
+#define AXXIA_DEBUG_UART_PHYS  AXXIA_UART0_PHYS
+#endif
+
+#endif
-- 
1.7.9.5



More information about the linux-yocto mailing list