| /* SPDX-License-Identifier: GPL-2.0+ |
| * |
| * Shared SCU setup for mach-shmobile |
| * |
| * Copyright (C) 2012 Bastian Hecht |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/init.h> |
| #include <asm/memory.h> |
| |
| /* |
| * 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) |
