1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2010-2011 Calxeda, Inc.
4 * Copyright 2012 Pavel Machek <pavel@denx.de>
5 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
6 * Copyright (C) 2012 Altera Corporation
7 */
8#include <linux/delay.h>
9#include <linux/init.h>
10#include <linux/smp.h>
11#include <linux/io.h>
12#include <linux/of.h>
13#include <linux/of_address.h>
14
15#include <asm/cacheflush.h>
16#include <asm/smp_scu.h>
17#include <asm/smp_plat.h>
18
19#include "core.h"
20
21static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
22{
23	int trampoline_size = secondary_trampoline_end - secondary_trampoline;
24
25	if (socfpga_cpu1start_addr) {
26		/* This will put CPU #1 into reset. */
27		writel(RSTMGR_MPUMODRST_CPU1,
28		       rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
29
30		memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size);
31
32		writel(__pa_symbol(secondary_startup),
33		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff));
34
35		flush_cache_all();
36		smp_wmb();
37		outer_clean_range(0, trampoline_size);
38
39		/* This will release CPU #1 out of reset. */
40		writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
41	}
42
43	return 0;
44}
45
46static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
47{
48	int trampoline_size = secondary_trampoline_end - secondary_trampoline;
49
50	if (socfpga_cpu1start_addr) {
51		writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
52		       SOCFPGA_A10_RSTMGR_MODMPURST);
53		memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size);
54
55		writel(__pa_symbol(secondary_startup),
56		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
57
58		flush_cache_all();
59		smp_wmb();
60		outer_clean_range(0, trampoline_size);
61
62		/* This will release CPU #1 out of reset. */
63		writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
64	}
65
66	return 0;
67}
68
69static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
70{
71	struct device_node *np;
72	void __iomem *socfpga_scu_base_addr;
73
74	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
75	if (!np) {
76		pr_err("%s: missing scu\n", __func__);
77		return;
78	}
79
80	socfpga_scu_base_addr = of_iomap(np, 0);
81	if (!socfpga_scu_base_addr)
82		return;
83	scu_enable(socfpga_scu_base_addr);
84}
85
86#ifdef CONFIG_HOTPLUG_CPU
87/*
88 * platform-specific code to shutdown a CPU
89 *
90 * Called with IRQs disabled
91 */
92static void socfpga_cpu_die(unsigned int cpu)
93{
94	/* Do WFI. If we wake up early, go back into WFI */
95	while (1)
96		cpu_do_idle();
97}
98
99/*
100 * We need a dummy function so that platform_can_cpu_hotplug() knows
101 * we support CPU hotplug. However, the function does not need to do
102 * anything, because CPUs going offline just do WFI. We could reset
103 * the CPUs but it would increase power consumption.
104 */
105static int socfpga_cpu_kill(unsigned int cpu)
106{
107	return 1;
108}
109#endif
110
111static const struct smp_operations socfpga_smp_ops __initconst = {
112	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
113	.smp_boot_secondary	= socfpga_boot_secondary,
114#ifdef CONFIG_HOTPLUG_CPU
115	.cpu_die		= socfpga_cpu_die,
116	.cpu_kill		= socfpga_cpu_kill,
117#endif
118};
119
120static const struct smp_operations socfpga_a10_smp_ops __initconst = {
121	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
122	.smp_boot_secondary	= socfpga_a10_boot_secondary,
123#ifdef CONFIG_HOTPLUG_CPU
124	.cpu_die		= socfpga_cpu_die,
125	.cpu_kill		= socfpga_cpu_kill,
126#endif
127};
128
129CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
130CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);
131