From: shawn.guo@linaro.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: imx: add low-level debug for vybrid
Date: Tue, 16 Jul 2013 21:31:02 +0800 [thread overview]
Message-ID: <1373981462-22670-1-git-send-email-shawn.guo@linaro.org> (raw)
Add low-level debug support for vybrid, so that earlyprintk can be
enabled for debugging early boot issue.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
arch/arm/Kconfig.debug | 8 ++++++++
arch/arm/include/debug/vf.S | 26 ++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
create mode 100644 arch/arm/include/debug/vf.S
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index e401a76..0aa5b9d 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -355,6 +355,13 @@ choice
when u-boot hands over to the kernel, the system
silently crashes, with no serial output at all.
+ config DEBUG_VF_UART
+ bool "Vybrid UART"
+ depends on SOC_VF610
+ help
+ Say Y here if you want kernel low-level debugging support
+ on Vybrid based platforms.
+
config DEBUG_NOMADIK_UART
bool "Kernel low-level debugging messages via NOMADIK UART"
depends on ARCH_NOMADIK
@@ -798,6 +805,7 @@ config DEBUG_LL_INCLUDE
default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1 || \
DEBUG_VEXPRESS_UART0_CRX
+ default "debug/vf.S" if DEBUG_VF_UART
default "debug/vt8500.S" if DEBUG_VT8500_UART0
default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
default "mach/debug-macro.S"
diff --git a/arch/arm/include/debug/vf.S b/arch/arm/include/debug/vf.S
new file mode 100644
index 0000000..ba12cc4
--- /dev/null
+++ b/arch/arm/include/debug/vf.S
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * 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.
+ *
+ */
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =0x40028000 @ physical
+ ldr \rv, =0xfe028000 @ virtual
+ .endm
+
+ .macro senduart, rd, rx
+ strb \rd, [\rx, #0x7] @ Data Register
+ .endm
+
+ .macro busyuart, rd, rx
+1001: ldrb \rd, [\rx, #0x4] @ Status Register 1
+ tst \rd, #1 << 6 @ TC
+ beq 1001b @ wait until transmit done
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
--
1.7.9.5
reply other threads:[~2013-07-16 13:31 UTC|newest]
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