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
/*
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* linux/arch/arm/boot/compressed/head-vt8500.S
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*
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* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
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*
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* VIA VT8500 specific tweaks. This is merged into head.S by the linker.
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*
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*/
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#include <linux/linkage.h>
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#include <asm/mach-types.h>
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.section ".start", "ax"
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__VT8500_start:
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@ Compare the SCC ID register against a list of known values
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ldr r1, .SCCID
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ldr r3, [r1]
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@ VT8500 override
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ldr r4, .VT8500SCC
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cmp r3, r4
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ldreq r7, .ID_BV07
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beq .Lendvt8500
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@ WM8505 override
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ldr r4, .WM8505SCC
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cmp r3, r4
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ldreq r7, .ID_8505
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beq .Lendvt8500
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@ Otherwise, leave the bootloader's machine id untouched
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.SCCID:
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.word 0xd8120000
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.VT8500SCC:
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.word 0x34000102
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.WM8505SCC:
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.word 0x34260103
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.ID_BV07:
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.word MACH_TYPE_BV07
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.ID_8505:
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.word MACH_TYPE_WM8505_7IN_NETBOOK
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.Lendvt8500:
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