ARM: debug-ll: rework footbridge handling

Footbridge has two debug ports that are handled a bit differently:

The 8250 port uses the normal debug/8250.S implementation that is shared
with a lot of other platforms, but it relies on the DEBUG_UART_8250
option to be turned on automatically instead of being selected by
DEBUG_FOOTBRIDGE_COM1 as we do for most other platforms. I'm changing
this to use a 'select' and change the dependency to the debug symbol
rather than the platform symbol for consistency.

The DC21285 UART has a separate top-level option, and relies on
the traditional include/mach/debug-macro.S method. With the s3c64xx
multiplatform series queued up for 4.5, it is now the last one that does
this, so by moving this file to include/debug/dc21285.S, we can get
all platforms to do things the same way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/include/debug/dc21285.S b/arch/arm/include/debug/dc21285.S
new file mode 100644
index 000000000000..02247f313e94
--- /dev/null
+++ b/arch/arm/include/debug/dc21285.S
@@ -0,0 +1,42 @@
+/* arch/arm/mach-footbridge/include/mach/debug-macro.S
+ *
+ * Debugging macro include header
+ *
+ *  Copyright (C) 1994-1999 Russell King
+ *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+ *
+ * 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 <asm/hardware/dec21285.h>
+
+#include <mach/hardware.h>
+        /* For EBSA285 debugging */
+                .equ    dc21285_high, ARMCSR_BASE & 0xff000000
+                .equ    dc21285_low,  ARMCSR_BASE & 0x00ffffff
+
+                .macro  addruart, rp, rv, tmp
+                .if     dc21285_low
+                mov     \rp, #dc21285_low
+                .else
+                mov     \rp, #0
+                .endif
+                orr     \rv, \rp, #dc21285_high
+                orr     \rp, \rp, #0x42000000
+                .endm
+
+                .macro  senduart,rd,rx
+                str     \rd, [\rx, #0x160]      @ UARTDR
+                .endm
+
+                .macro  busyuart,rd,rx
+1001:           ldr     \rd, [\rx, #0x178]      @ UARTFLG
+                tst     \rd, #1 << 3
+                bne     1001b
+                .endm
+
+                .macro  waituart,rd,rx
+                .endm