1/*
2 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/linkage.h>
16#include <asm/assembler.h>
17#include <asm/cp15.h>
18
19ENTRY(uniphier_smp_trampoline)
20ARM_BE8(setend	be)			@ ensure we are in BE8 mode
21	mrc	p15, 0, r0, c0, c0, 5	@ MPIDR (Multiprocessor Affinity Reg)
22	and  	r2, r0, #0x3		@ CPU ID
23	ldr	r1, uniphier_smp_trampoline_jump
24	ldr	r3, uniphier_smp_trampoline_poll_addr
25	mrc	p15, 0, r0, c1, c0, 0	@ SCTLR (System Control Register)
26	orr	r0, r0, #CR_I		@ Enable ICache
27	bic	r0, r0, #(CR_C | CR_M)	@ Disable MMU and Dcache
28	mcr	p15, 0, r0, c1, c0, 0
29	b	1f			@ cache the following 5 instructions
300:	wfe
311:	ldr	r0, [r3]
32	cmp	r0, r2
33	bxeq	r1			@ branch to secondary_startup
34	b	0b
35	.globl	uniphier_smp_trampoline_jump
36uniphier_smp_trampoline_jump:
37	.word	0			@ set virt_to_phys(secondary_startup)
38	.globl	uniphier_smp_trampoline_poll_addr
39uniphier_smp_trampoline_poll_addr:
40	.word	0			@ set CPU ID to be kicked to this reg
41	.globl	uniphier_smp_trampoline_end
42uniphier_smp_trampoline_end:
43ENDPROC(uniphier_smp_trampoline)
44