arm: return both physical and virtual addresses from addruart

Rather than checking the MMU status in every instance of addruart, do it
once in kernel/debug.S, and change the existing addruart macros to
return both physical and virtual addresses. The main debug code can then
select the appropriate address to use.

This will also allow us to retreive the address of a uart for the MMU
state that we're not current in.

Updated with fixes for OMAP from Jason Wang <jason77.wang@gmail.com>
and Tony Lindgren <tony@atomide.com>, and fix for versatile express from
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jason Wang <jason77.wang@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Tested-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/arch/arm/mach-vexpress/include/mach/debug-macro.S b/arch/arm/mach-vexpress/include/mach/debug-macro.S
index 5167e2aceeb..050d65e02a4 100644
--- a/arch/arm/mach-vexpress/include/mach/debug-macro.S
+++ b/arch/arm/mach-vexpress/include/mach/debug-macro.S
@@ -12,12 +12,10 @@
 
 #define DEBUG_LL_UART_OFFSET    0x00009000
 
-                .macro  addruart,rx,tmp
-                mrc     p15, 0, \rx, c1, c0
-                tst     \rx, #1                 @ MMU enabled?
-                moveq   \rx,      #0x10000000
-                movne   \rx,      #0xf8000000   @ virtual base
-                orr     \rx, \rx, #DEBUG_LL_UART_OFFSET
+                .macro  addruart,rp,rv
+                mov     \rp, #DEBUG_LL_UART_OFFSET
+                orr     \rv, \rp, #0xf8000000   @ virtual base
+                orr     \rp, \rp, #0x10000000   @ physical base
                 .endm
 
 #include <asm/hardware/debug-pl01x.S>