[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>

4 files changed, 49 insertions, 1 deletions

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 35f8db35f442..a71fd941ade7 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -77,7 +77,7 @@ config DEBUG_ICEDCC
           Say Y here if you want the debug print routines to direct their
           output to the EmbeddedICE macrocell's DCC channel using
           co-processor 14. This is known to work on the ARM9 style ICE
-          channel.
+          channel and on the XScale with the PEEDI.
 
           It does include a timeout to ensure that the system does not
           totally freeze when there is nothing connected to read.
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
 
diff --git a/arch/arm/kernel/debug.S b/arch/arm/kernel/debug.S
index f53c58290543..b121b6053cce 100644
--- a/arch/arm/kernel/debug.S
+++ b/arch/arm/kernel/debug.S
@@ -49,6 +49,33 @@
 1002:
                 .endm
 
+#elif defined(CONFIG_CPU_XSCALE)
+
+                .macro  addruart, rx
+                .endm
+
+                .macro  senduart, rd, rx
+                mcr     p14, 0, \rd, c8, c0, 0
+                .endm
+
+                .macro  busyuart, rd, rx
+1001:
+                mrc     p14, 0, \rx, c14, c0, 0
+                tst     \rx, #0x10000000
+                beq     1001b
+                .endm
+
+                .macro  waituart, rd, rx
+                mov     \rd, #0x10000000
+1001:
+                subs    \rd, \rd, #1
+                bmi     1002f
+                mrc     p14, 0, \rx, c14, c0, 0
+                tst     \rx, #0x10000000
+                bne     1001b
+1002:
+                .endm
+
 #else
 
                 .macro  addruart, rx