From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/arm/mach-shmobile/headsmp-scu.S | 40 ++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 arch/arm/mach-shmobile/headsmp-scu.S (limited to 'arch/arm/mach-shmobile/headsmp-scu.S') diff --git a/arch/arm/mach-shmobile/headsmp-scu.S b/arch/arm/mach-shmobile/headsmp-scu.S new file mode 100644 index 000000000..936d7011c --- /dev/null +++ b/arch/arm/mach-shmobile/headsmp-scu.S @@ -0,0 +1,40 @@ +/* + * Shared SCU setup for mach-shmobile + * + * Copyright (C) 2012 Bastian Hecht + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include + +/* + * Boot code for secondary CPUs. + * + * First we turn on L1 cache coherency for our CPU. Then we jump to + * secondary_startup that invalidates the cache and hands over control + * to the common ARM startup code. + */ +ENTRY(shmobile_boot_scu) + @ r0 = SCU base address + mrc p15, 0, r1, c0, c0, 5 @ read MPIDR + and r1, r1, #3 @ mask out cpu ID + lsl r1, r1, #3 @ we will shift by cpu_id * 8 bits + ldr r2, [r0, #8] @ SCU Power Status Register + mov r3, #3 + lsl r3, r3, r1 + bic r2, r2, r3 @ Clear bits of our CPU (Run Mode) + str r2, [r0, #8] @ write back + + b secondary_startup +ENDPROC(shmobile_boot_scu) -- cgit v1.2.3