[ARM] Collect 8250-based debug implementations together

Several ARM machine implementations used an 8250 compatible port for
debugging purposes, and indepdently implemented the low level debug
macros every time.  Provide a common implementation and convert these
implementations to use this version.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 29 insertions, 0 deletions

diff --git a/include/asm-arm/hardware/debug-8250.S b/include/asm-arm/hardware/debug-8250.S
new file mode 100644
index 000000000000..4594fea91ec1
--- /dev/null
+++ b/include/asm-arm/hardware/debug-8250.S
@@ -0,0 +1,29 @@
+/*
+ * linux/include/asm-arm/hardware/debug-8250.h
+ *
+ *  Copyright (C) 1994-1999 Russell King
+ *
+ * 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.
+ */
+#include <linux/serial_reg.h>
+
+                .macro  senduart,rd,rx
+                strb    \rd, [\rx, #UART_TX << UART_SHIFT]
+                .endm
+
+                .macro  busyuart,rd,rx
+1002:           ldrb    \rd, [\rx, #UART_LSR << UART_SHIFT]
+                and     \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
+                teq     \rd, #UART_LSR_TEMT | UART_LSR_THRE
+                bne     1002b
+                .endm
+
+                .macro  waituart,rd,rx
+#ifdef FLOW_CONTROL
+1001:           ldrb    \rd, [\rx, #UART_MSR << UART_SHIFT]
+                tst     \rd, #UART_MSR_CTS
+                beq     1001b
+#endif
+                .endm