android_kernel_xiaomi_sm8350/arch/powerpc/kernel/cpu_setup_44x.S
Grant Likely 640d17d60e powerpc/virtex5: Fix Virtex5 machine check handling
The 440x5 core in the Virtex5 uses the 440A type machine check
(ie, they have MCSRR0/MCSRR1). They thus need to call the
appropriate fixup function to hook the right variant of the
exception.

Without this, all machine checks become fatal due to loss
of context when entering the exception handler.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2008-12-05 14:34:26 -05:00

73 lines
1.6 KiB
ArmAsm

/*
* This file contains low level CPU setup functions.
* Valentine Barshak <vbarshak@ru.mvista.com>
* MontaVista Software, Inc (c) 2007
*
* Based on cpu_setup_6xx code by
* Benjamin Herrenschmidt <benh@kernel.crashing.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/ppc_asm.h>
_GLOBAL(__setup_cpu_440ep)
b __init_fpu_44x
_GLOBAL(__setup_cpu_440epx)
mflr r4
bl __init_fpu_44x
bl __plb_disable_wrp
bl __fixup_440A_mcheck
mtlr r4
blr
_GLOBAL(__setup_cpu_440grx)
mflr r4
bl __plb_disable_wrp
bl __fixup_440A_mcheck
mtlr r4
blr
_GLOBAL(__setup_cpu_460ex)
_GLOBAL(__setup_cpu_460gt)
mflr r4
bl __init_fpu_44x
bl __fixup_440A_mcheck
mtlr r4
blr
_GLOBAL(__setup_cpu_440x5)
_GLOBAL(__setup_cpu_440gx)
_GLOBAL(__setup_cpu_440spe)
b __fixup_440A_mcheck
/* enable APU between CPU and FPU */
_GLOBAL(__init_fpu_44x)
mfspr r3,SPRN_CCR0
/* Clear DAPUIB flag in CCR0 */
rlwinm r3,r3,0,12,10
mtspr SPRN_CCR0,r3
isync
blr
/*
* Workaround for the incorrect write to DDR SDRAM errata.
* The write address can be corrupted during writes to
* DDR SDRAM when write pipelining is enabled on PLB0.
* Disable write pipelining here.
*/
#define DCRN_PLB4A0_ACR 0x81
_GLOBAL(__plb_disable_wrp)
mfdcr r3,DCRN_PLB4A0_ACR
/* clear WRP bit in PLB4A0_ACR */
rlwinm r3,r3,0,8,6
mtdcr DCRN_PLB4A0_ACR,r3
isync
blr