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>

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 000000000000..c9517150766a
--- /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