forked from Minki/linux
21f47fbc5b
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>
47 lines
810 B
ArmAsm
47 lines
810 B
ArmAsm
/*
|
|
* 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:
|