135 lines
3.6 KiB
ArmAsm
135 lines
3.6 KiB
ArmAsm
/*
|
|
* Secondary CPU startup routine source file.
|
|
*
|
|
* Copyright (C) 2009-2014 Texas Instruments, Inc.
|
|
*
|
|
* Author:
|
|
* Santosh Shilimkar <santosh.shilimkar@ti.com>
|
|
*
|
|
* Interface functions needed for the SMP. This file is based on arm
|
|
* realview smp platform.
|
|
* Copyright (c) 2003 ARM Limited.
|
|
*
|
|
* This program is free software,you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
#include <asm/assembler.h>
|
|
|
|
#include "omap44xx.h"
|
|
|
|
/* Physical address needed since MMU not enabled yet on secondary core */
|
|
#define AUX_CORE_BOOT0_PA 0x48281800
|
|
#define API_HYP_ENTRY 0x102
|
|
|
|
ENTRY(omap_secondary_startup)
|
|
#ifdef CONFIG_SMP
|
|
b secondary_startup
|
|
#else
|
|
/* Should never get here */
|
|
again: wfi
|
|
b again
|
|
#endif
|
|
#ENDPROC(omap_secondary_startup)
|
|
|
|
/*
|
|
* OMAP5 specific entry point for secondary CPU to jump from ROM
|
|
* code. This routine also provides a holding flag into which
|
|
* secondary core is held until we're ready for it to initialise.
|
|
* The primary core will update this flag using a hardware
|
|
* register AuxCoreBoot0.
|
|
*/
|
|
ENTRY(omap5_secondary_startup)
|
|
wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0
|
|
ldr r0, [r2]
|
|
mov r0, r0, lsr #5
|
|
mrc p15, 0, r4, c0, c0, 5
|
|
and r4, r4, #0x0f
|
|
cmp r0, r4
|
|
bne wait
|
|
b omap_secondary_startup
|
|
ENDPROC(omap5_secondary_startup)
|
|
/*
|
|
* Same as omap5_secondary_startup except we call into the ROM to
|
|
* enable HYP mode first. This is called instead of
|
|
* omap5_secondary_startup if the primary CPU was put into HYP mode by
|
|
* the boot loader.
|
|
*/
|
|
ENTRY(omap5_secondary_hyp_startup)
|
|
wait_2: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0
|
|
ldr r0, [r2]
|
|
mov r0, r0, lsr #5
|
|
mrc p15, 0, r4, c0, c0, 5
|
|
and r4, r4, #0x0f
|
|
cmp r0, r4
|
|
bne wait_2
|
|
ldr r12, =API_HYP_ENTRY
|
|
badr r0, hyp_boot
|
|
smc #0
|
|
hyp_boot:
|
|
b omap_secondary_startup
|
|
ENDPROC(omap5_secondary_hyp_startup)
|
|
/*
|
|
* OMAP4 specific entry point for secondary CPU to jump from ROM
|
|
* code. This routine also provides a holding flag into which
|
|
* secondary core is held until we're ready for it to initialise.
|
|
* The primary core will update this flag using a hardware
|
|
* register AuxCoreBoot0.
|
|
*/
|
|
ENTRY(omap4_secondary_startup)
|
|
hold: ldr r12,=0x103
|
|
dsb
|
|
smc #0 @ read from AuxCoreBoot0
|
|
mov r0, r0, lsr #9
|
|
mrc p15, 0, r4, c0, c0, 5
|
|
and r4, r4, #0x0f
|
|
cmp r0, r4
|
|
bne hold
|
|
|
|
/*
|
|
* we've been released from the wait loop,secondary_stack
|
|
* should now contain the SVC stack for this core
|
|
*/
|
|
b omap_secondary_startup
|
|
ENDPROC(omap4_secondary_startup)
|
|
|
|
ENTRY(omap4460_secondary_startup)
|
|
hold_2: ldr r12,=0x103
|
|
dsb
|
|
smc #0 @ read from AuxCoreBoot0
|
|
mov r0, r0, lsr #9
|
|
mrc p15, 0, r4, c0, c0, 5
|
|
and r4, r4, #0x0f
|
|
cmp r0, r4
|
|
bne hold_2
|
|
|
|
/*
|
|
* GIC distributor control register has changed between
|
|
* CortexA9 r1pX and r2pX. The Control Register secure
|
|
* banked version is now composed of 2 bits:
|
|
* bit 0 == Secure Enable
|
|
* bit 1 == Non-Secure Enable
|
|
* The Non-Secure banked register has not changed
|
|
* Because the ROM Code is based on the r1pX GIC, the CPU1
|
|
* GIC restoration will cause a problem to CPU0 Non-Secure SW.
|
|
* The workaround must be:
|
|
* 1) Before doing the CPU1 wakeup, CPU0 must disable
|
|
* the GIC distributor
|
|
* 2) CPU1 must re-enable the GIC distributor on
|
|
* it's wakeup path.
|
|
*/
|
|
ldr r1, =OMAP44XX_GIC_DIST_BASE
|
|
ldr r0, [r1]
|
|
orr r0, #1
|
|
str r0, [r1]
|
|
|
|
/*
|
|
* we've been released from the wait loop,secondary_stack
|
|
* should now contain the SVC stack for this core
|
|
*/
|
|
b omap_secondary_startup
|
|
ENDPROC(omap4460_secondary_startup)
|