1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2002 ARM Ltd.
6 #include <linux/init.h>
7 #include <linux/errno.h>
10 #include <linux/of_address.h>
11 #include <linux/vexpress.h>
14 #include <asm/smp_scu.h>
15 #include <asm/mach/map.h>
20 bool __init
vexpress_smp_init_ops(void)
24 struct device_node
*cpu_node
, *cci_node
;
27 * The best way to detect a multi-cluster configuration
28 * is to detect if the kernel can take over CCI ports
29 * control. Loop over possible CPUs and check if CCI
30 * port control is available.
31 * Override the default vexpress_smp_ops if so.
33 for_each_possible_cpu(cpu
) {
36 cpu_node
= of_get_cpu_node(cpu
, NULL
);
37 if (WARN(!cpu_node
, "Missing cpu device node!"))
40 cci_node
= of_parse_phandle(cpu_node
, "cci-control-port", 0);
41 available
= cci_node
&& of_device_is_available(cci_node
);
42 of_node_put(cci_node
);
43 of_node_put(cpu_node
);
56 static const struct of_device_id vexpress_smp_dt_scu_match
[] __initconst
= {
57 { .compatible
= "arm,cortex-a5-scu", },
58 { .compatible
= "arm,cortex-a9-scu", },
62 static void __init
vexpress_smp_dt_prepare_cpus(unsigned int max_cpus
)
64 struct device_node
*scu
= of_find_matching_node(NULL
,
65 vexpress_smp_dt_scu_match
);
68 scu_enable(of_iomap(scu
, 0));
71 * Write the address of secondary startup into the
72 * system-wide flags register. The boot monitor waits
73 * until it receives a soft interrupt, and then the
74 * secondary CPU branches to this address.
76 vexpress_flags_set(__pa_symbol(versatile_secondary_startup
));
79 #ifdef CONFIG_HOTPLUG_CPU
80 static void vexpress_cpu_die(unsigned int cpu
)
82 versatile_immitation_cpu_die(cpu
, 0x40);
86 const struct smp_operations vexpress_smp_dt_ops __initconst
= {
87 .smp_prepare_cpus
= vexpress_smp_dt_prepare_cpus
,
88 .smp_secondary_init
= versatile_secondary_init
,
89 .smp_boot_secondary
= versatile_boot_secondary
,
90 #ifdef CONFIG_HOTPLUG_CPU
91 .cpu_die
= vexpress_cpu_die
,