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authorShawn Guo <shawn.guo@linaro.org>2013-05-12 17:22:17 +0800
committerShawn Guo <shawn.guo@linaro.org>2013-10-21 09:11:07 +0800
commitc7c3eac6277bc60fb4472a16c5af5d54afc83596 (patch)
treed5adc61fddb818e903eeb617d6f2e8c5a560f763 /arch/arm/include/debug
parent4c1dd3e5edc1619199b4a42618169ac3ac457cb5 (diff)
ARM: imx: add low-level debug for vybrid
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>
Diffstat (limited to 'arch/arm/include/debug')
-rw-r--r--arch/arm/include/debug/vf.S26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/include/debug/vf.S b/arch/arm/include/debug/vf.S
new file mode 100644
index 000000000000..ba12cc44b2cb
--- /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