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authorBaruch Siach <baruch@tkos.co.il>2015-01-14 10:40:31 +0200
committerOlof Johansson <olof@lixom.net>2015-01-27 15:11:51 -0800
commite23814da826283ee540f2c0837bba1937cd8f6b5 (patch)
tree63191ca025fe9368622d4f643eb025f0f50b538a /arch/arm/include/debug
parentdf8d742e9299ef6c0fdc3edf6f028f211f683a7b (diff)
ARM: digicolor: add low level debug support
Use the USART peripheral as UART for low level debug. Only the UA0 port is currently supported. Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/include/debug')
-rw-r--r--arch/arm/include/debug/digicolor.S35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/include/debug/digicolor.S b/arch/arm/include/debug/digicolor.S
new file mode 100644
index 00000000000..c9517150766
--- /dev/null
+++ b/arch/arm/include/debug/digicolor.S
@@ -0,0 +1,35 @@
+/*
+ * Debugging macro include header for Conexant Digicolor USART
+ *
+ * Copyright (C) 2014 Paradox Innovation Ltd.
+ *
+ * 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.
+ *
+*/
+
+#define UA0_STATUS 0x0742
+#define UA0_EMI_REC 0x0744
+
+#define UA0_STATUS_TX_READY 0x40
+
+#ifdef CONFIG_DEBUG_UART_PHYS
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT
+ .endm
+#endif
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #UA0_EMI_REC]
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldrb \rd, [\rx, #UA0_STATUS]
+ tst \rd, #UA0_STATUS_TX_READY
+ beq 1001b
+ .endm