1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015 Linus Walleij
8 #include <linux/of_address.h>
9 #include <linux/regmap.h>
10 #include <linux/mfd/syscon.h>
12 #include <asm/cacheflush.h>
13 #include <asm/smp_plat.h>
14 #include <asm/smp_scu.h>
16 #include <plat/platsmp.h>
18 #define REALVIEW_SYS_FLAGSSET_OFFSET 0x30
20 static 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", },
27 static 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", },
35 static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
37 struct device_node *np;
38 void __iomem *scu_base;
43 np = of_find_matching_node(NULL, realview_scu_match);
45 pr_err("PLATSMP: No SCU base address\n");
48 scu_base = of_iomap(np, 0);
51 pr_err("PLATSMP: No SCU remap\n");
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);
62 /* The syscon contains the magic SMP start address registers */
63 np = of_find_matching_node(NULL, realview_syscon_match);
65 pr_err("PLATSMP: No syscon match\n");
68 map = syscon_node_to_regmap(np);
70 pr_err("PLATSMP: No syscon regmap\n");
73 /* Put the boot address in this magic register */
74 regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET,
75 __pa_symbol(versatile_secondary_startup));
78 #ifdef CONFIG_HOTPLUG_CPU
79 static void realview_cpu_die(unsigned int cpu)
81 return versatile_immitation_cpu_die(cpu, 0x20);
85 static 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,
93 CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops);