[ARM] 5412/1: XSCALE: add ice dcc support

SCALE: add ice dcc support

Tested on the ixp425 with the ice PEEDI

Ack-by: Eric Miao <eric.miao@marvell.com>

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 21 insertions, 0 deletions

diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 77d614232d81..d1b678dc120b 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -27,6 +27,12 @@
                 .macro  writeb, ch, rb
                 mcr     p14, 0, \ch, c0, c5, 0
                 .endm
+#elif defined(CONFIG_CPU_XSCALE)
+                .macro  loadsp, rb
+                .endm
+                .macro  writeb, ch, rb
+                mcr     p14, 0, \ch, c8, c0, 0
+                .endm
 #else
                 .macro  loadsp, rb
                 .endm
diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
index 3fc08413fff0..393c81641314 100644
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -46,6 +46,21 @@ static void icedcc_putc(int ch)
 
         asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
 }
+#elif defined(CONFIG_CPU_XSCALE)
+
+static void icedcc_putc(int ch)
+{
+        int status, i = 0x4000000;
+
+        do {
+                if (--i < 0)
+                        return;
+
+                asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
+        } while (status & (1 << 28));
+
+        asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
+}
 
 #else