xref: /openbmc/linux/arch/arm/mach-sunxi/headsmp.S (revision 55fd7e02)
1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * Copyright (c) 2018 Chen-Yu Tsai
4 * Copyright (c) 2018 Bootlin
5 *
6 * Chen-Yu Tsai <wens@csie.org>
7 * Mylène Josserand <mylene.josserand@bootlin.com>
8 *
9 * SMP support for sunxi based systems with Cortex A7/A15
10 *
11 */
12
13#include <linux/linkage.h>
14#include <asm/assembler.h>
15#include <asm/cputype.h>
16
17ENTRY(sunxi_mc_smp_cluster_cache_enable)
18	.arch	armv7-a
19	/*
20	 * Enable cluster-level coherency, in preparation for turning on the MMU.
21	 *
22	 * Also enable regional clock gating and L2 data latency settings for
23	 * Cortex-A15. These settings are from the vendor kernel.
24	 */
25	mrc	p15, 0, r1, c0, c0, 0
26	movw	r2, #(ARM_CPU_PART_MASK & 0xffff)
27	movt	r2, #(ARM_CPU_PART_MASK >> 16)
28	and	r1, r1, r2
29	movw	r2, #(ARM_CPU_PART_CORTEX_A15 & 0xffff)
30	movt	r2, #(ARM_CPU_PART_CORTEX_A15 >> 16)
31	cmp	r1, r2
32	bne	not_a15
33
34	/* The following is Cortex-A15 specific */
35
36	/* ACTLR2: Enable CPU regional clock gates */
37	mrc p15, 1, r1, c15, c0, 4
38	orr r1, r1, #(0x1 << 31)
39	mcr p15, 1, r1, c15, c0, 4
40
41	/* L2ACTLR */
42	mrc p15, 1, r1, c15, c0, 0
43	/* Enable L2, GIC, and Timer regional clock gates */
44	orr r1, r1, #(0x1 << 26)
45	/* Disable clean/evict from being pushed to external */
46	orr r1, r1, #(0x1<<3)
47	mcr p15, 1, r1, c15, c0, 0
48
49	/* L2CTRL: L2 data RAM latency */
50	mrc p15, 1, r1, c9, c0, 2
51	bic r1, r1, #(0x7 << 0)
52	orr r1, r1, #(0x3 << 0)
53	mcr p15, 1, r1, c9, c0, 2
54
55	/* End of Cortex-A15 specific setup */
56	not_a15:
57
58	/* Get value of sunxi_mc_smp_first_comer */
59	adr	r1, first
60	ldr	r0, [r1]
61	ldr	r0, [r1, r0]
62
63	/* Skip cci_enable_port_for_self if not first comer */
64	cmp	r0, #0
65	bxeq	lr
66	b	cci_enable_port_for_self
67
68	.align 2
69	first: .word sunxi_mc_smp_first_comer - .
70ENDPROC(sunxi_mc_smp_cluster_cache_enable)
71
72ENTRY(sunxi_mc_smp_secondary_startup)
73	bl	sunxi_mc_smp_cluster_cache_enable
74	bl	secure_cntvoff_init
75	b	secondary_startup
76ENDPROC(sunxi_mc_smp_secondary_startup)
77
78ENTRY(sunxi_mc_smp_resume)
79	bl	sunxi_mc_smp_cluster_cache_enable
80	b	cpu_resume
81ENDPROC(sunxi_mc_smp_resume)
82