ARM: 6597/1: Add basic architecture support for VIA/WonderMedia 85xx SoC's

This adds support for the family of Systems-on-Chip produced initially
by VIA and now its subsidiary WonderMedia that have recently become
widespread in lower-end Chinese ARM-based tablets and netbooks.

Support is included for both VT8500 and WM8505, selectable by a
configuration switch at kernel build time.

Included are basic machine initialization files, register and
interrupt definitions, support for the on-chip interrupt controller,
high-precision OS timer, GPIO lines, necessary macros for early debug,
pulse-width-modulated outputs control, as well as platform device
configurations for the specific drivers implemented elsewhere.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 50 insertions, 0 deletions

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 0a8f748e506a..78fe31a4f503 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -29,6 +29,10 @@ ifeq ($(CONFIG_ARCH_SA1100),y)
 OBJS            += head-sa1100.o
 endif
 
+ifeq ($(CONFIG_ARCH_VT8500),y)
+OBJS            += head-vt8500.o
+endif
+
 ifeq ($(CONFIG_CPU_XSCALE),y)
 OBJS            += head-xscale.o
 endif
diff --git a/arch/arm/boot/compressed/head-vt8500.S b/arch/arm/boot/compressed/head-vt8500.S
new file mode 100644
index 000000000000..1dc1e21a3be3
--- /dev/null
+++ b/arch/arm/boot/compressed/head-vt8500.S
@@ -0,0 +1,46 @@
+/*
+ * linux/arch/arm/boot/compressed/head-vt8500.S
+ *
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * VIA VT8500 specific tweaks. This is merged into head.S by the linker.
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/mach-types.h>
+
+                .section        ".start", "ax"
+
+__VT8500_start:
+        @ Compare the SCC ID register against a list of known values
+        ldr     r1, .SCCID
+        ldr     r3, [r1]
+
+        @ VT8500 override
+        ldr     r4, .VT8500SCC
+        cmp     r3, r4
+        ldreq   r7, .ID_BV07
+        beq     .Lendvt8500
+
+        @ WM8505 override
+        ldr     r4, .WM8505SCC
+        cmp     r3, r4
+        ldreq   r7, .ID_8505
+        beq     .Lendvt8500
+
+        @ Otherwise, leave the bootloader's machine id untouched
+
+.SCCID:
+        .word   0xd8120000
+.VT8500SCC:
+        .word   0x34000102
+.WM8505SCC:
+        .word   0x34260103
+
+.ID_BV07:
+        .word   MACH_TYPE_BV07
+.ID_8505:
+        .word   MACH_TYPE_WM8505_7IN_NETBOOK
+
+.Lendvt8500: