1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2015 Linus Walleij
4 */
5#include <linux/smp.h>
6#include <linux/io.h>
7#include <linux/of.h>
8#include <linux/of_address.h>
9#include <linux/regmap.h>
10#include <linux/mfd/syscon.h>
11
12#include <asm/cacheflush.h>
13#include <asm/smp_plat.h>
14#include <asm/smp_scu.h>
15
16#include <plat/platsmp.h>
17
18#define REALVIEW_SYS_FLAGSSET_OFFSET	0x30
19
20static const struct of_device_id realview_scu_match[] = {
21	{ .compatible = "arm,arm11mp-scu", },
22	{ .compatible = "arm,cortex-a9-scu", },
23	{ .compatible = "arm,cortex-a5-scu", },
24	{ }
25};
26
27static const struct of_device_id realview_syscon_match[] = {
28        { .compatible = "arm,core-module-integrator", },
29        { .compatible = "arm,realview-eb-syscon", },
30        { .compatible = "arm,realview-pb11mp-syscon", },
31        { .compatible = "arm,realview-pbx-syscon", },
32        { },
33};
34
35static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
36{
37	struct device_node *np;
38	void __iomem *scu_base;
39	struct regmap *map;
40	unsigned int ncores;
41	int i;
42
43	np = of_find_matching_node(NULL, realview_scu_match);
44	if (!np) {
45		pr_err("PLATSMP: No SCU base address\n");
46		return;
47	}
48	scu_base = of_iomap(np, 0);
49	of_node_put(np);
50	if (!scu_base) {
51		pr_err("PLATSMP: No SCU remap\n");
52		return;
53	}
54
55	scu_enable(scu_base);
56	ncores = scu_get_core_count(scu_base);
57	pr_info("SCU: %d cores detected\n", ncores);
58	for (i = 0; i < ncores; i++)
59		set_cpu_possible(i, true);
60	iounmap(scu_base);
61
62	/* The syscon contains the magic SMP start address registers */
63	np = of_find_matching_node(NULL, realview_syscon_match);
64	if (!np) {
65		pr_err("PLATSMP: No syscon match\n");
66		return;
67	}
68	map = syscon_node_to_regmap(np);
69	if (IS_ERR(map)) {
70		pr_err("PLATSMP: No syscon regmap\n");
71		return;
72	}
73	/* Put the boot address in this magic register */
74	regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET,
75		     __pa_symbol(versatile_secondary_startup));
76}
77
78#ifdef CONFIG_HOTPLUG_CPU
79static void realview_cpu_die(unsigned int cpu)
80{
81	return versatile_immitation_cpu_die(cpu, 0x20);
82}
83#endif
84
85static const struct smp_operations realview_dt_smp_ops __initconst = {
86	.smp_prepare_cpus	= realview_smp_prepare_cpus,
87	.smp_secondary_init	= versatile_secondary_init,
88	.smp_boot_secondary	= versatile_boot_secondary,
89#ifdef CONFIG_HOTPLUG_CPU
90	.cpu_die		= realview_cpu_die,
91#endif
92};
93CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops);
94