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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-03-23 00:07:31 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-03-24 00:15:55 +0900 |
| commit | 62118b7b0183d29755a101a6a5b88dee11c5f94b (patch) | |
| tree | 5d7c5d8ab6e240b95793dc11706a376844e6f25d /arch/arm/mach-uniphier/smp.S | |
| parent | 4d13b1b708b8c31c0e22d7f31f05dde4b3961621 (diff) | |
| download | u-boot-imx-62118b7b0183d29755a101a6a5b88dee11c5f94b.zip u-boot-imx-62118b7b0183d29755a101a6a5b88dee11c5f94b.tar.gz u-boot-imx-62118b7b0183d29755a101a6a5b88dee11c5f94b.tar.bz2 | |
ARM: UniPhier: optimize kicking secondary CPUs code
Currently, the secondary CPU(s) are kicked three times:
Boot ROM ---(kick)--> SPL ---(kick)--> U-boot ---(kick)--> Linux.
It makes the boot sequence very complicated.
This commit merges the first and the second kicks, so the secondary
CPU(s) can directly jump from SPL to Linux.
arch/arm/mach-uniphier/smp.S is no longer necessary.
Linux boot test passed.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/arm/mach-uniphier/smp.S')
| -rw-r--r-- | arch/arm/mach-uniphier/smp.S | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/arch/arm/mach-uniphier/smp.S b/arch/arm/mach-uniphier/smp.S deleted file mode 100644 index 18e3a9d..0000000 --- a/arch/arm/mach-uniphier/smp.S +++ /dev/null @@ -1,54 +0,0 @@ -/* - * Copyright (C) 2013 Panasonic Corporation - * Author: Masahiro Yamada <yamada.m@jp.panasonic.com> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <config.h> -#include <linux/linkage.h> -#include <asm/system.h> -#include <mach/led.h> -#include <mach/sbc-regs.h> - -/* Entry point of U-Boot main program for the secondary CPU */ -LENTRY(secondary_entry) - mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register) - bic r0, r0, #(CR_C | CR_M) @ MMU and Dcache disable - mcr p15, 0, r0, c1, c0, 0 - mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs - mcr p15, 0, r0, c7, c5, 0 @ invalidate icache - dsb - led_write(C,0,,) - ldr r1, =ROM_BOOT_ROMRSV2 - mov r0, #0 - str r0, [r1] -0: wfe - ldr r4, [r1] @ r4: entry point for secondary CPUs - cmp r4, #0 - beq 0b - led_write(C, P, U, 1) - bx r4 @ secondary CPUs jump to linux -ENDPROC(secondary_entry) - -ENTRY(wakeup_secondary) - ldr r1, =ROM_BOOT_ROMRSV2 -0: ldr r0, [r1] - cmp r0, #0 - bne 0b - - /* set entry address and send event to the secondary CPU */ - ldr r0, =secondary_entry - str r0, [r1] - ldr r0, [r1] @ make sure store is complete - mov r0, #0x100 -0: subs r0, r0, #1 @ I don't know the reason, but without this wait - bne 0b @ fails to wake up the secondary CPU - sev - - /* wait until the secondary CPU reach to secondary_entry */ -0: ldr r0, [r1] - cmp r0, #0 - bne 0b - bx lr -ENDPROC(wakeup_secondary) |