1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/arch/arm/mach-vexpress/mcpm_platsmp.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Created by: Nicolas Pitre, November 2012
6*4882a593Smuzhiyun * Copyright: (C) 2012-2013 Linaro Limited
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Code to handle secondary CPU bringup and hotplug for the cluster power API.
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/smp.h>
13*4882a593Smuzhiyun #include <linux/spinlock.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include <asm/mcpm.h>
16*4882a593Smuzhiyun #include <asm/smp.h>
17*4882a593Smuzhiyun #include <asm/smp_plat.h>
18*4882a593Smuzhiyun
cpu_to_pcpu(unsigned int cpu,unsigned int * pcpu,unsigned int * pcluster)19*4882a593Smuzhiyun static void cpu_to_pcpu(unsigned int cpu,
20*4882a593Smuzhiyun unsigned int *pcpu, unsigned int *pcluster)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun unsigned int mpidr;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun mpidr = cpu_logical_map(cpu);
25*4882a593Smuzhiyun *pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
26*4882a593Smuzhiyun *pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
mcpm_boot_secondary(unsigned int cpu,struct task_struct * idle)29*4882a593Smuzhiyun static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun unsigned int pcpu, pcluster, ret;
32*4882a593Smuzhiyun extern void secondary_startup(void);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun cpu_to_pcpu(cpu, &pcpu, &pcluster);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n",
37*4882a593Smuzhiyun __func__, cpu, pcpu, pcluster);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun mcpm_set_entry_vector(pcpu, pcluster, NULL);
40*4882a593Smuzhiyun ret = mcpm_cpu_power_up(pcpu, pcluster);
41*4882a593Smuzhiyun if (ret)
42*4882a593Smuzhiyun return ret;
43*4882a593Smuzhiyun mcpm_set_entry_vector(pcpu, pcluster, secondary_startup);
44*4882a593Smuzhiyun arch_send_wakeup_ipi_mask(cpumask_of(cpu));
45*4882a593Smuzhiyun dsb_sev();
46*4882a593Smuzhiyun return 0;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
mcpm_secondary_init(unsigned int cpu)49*4882a593Smuzhiyun static void mcpm_secondary_init(unsigned int cpu)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun mcpm_cpu_powered_up();
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun #ifdef CONFIG_HOTPLUG_CPU
55*4882a593Smuzhiyun
mcpm_cpu_kill(unsigned int cpu)56*4882a593Smuzhiyun static int mcpm_cpu_kill(unsigned int cpu)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun unsigned int pcpu, pcluster;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun cpu_to_pcpu(cpu, &pcpu, &pcluster);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return !mcpm_wait_for_cpu_powerdown(pcpu, pcluster);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
mcpm_cpu_can_disable(unsigned int cpu)65*4882a593Smuzhiyun static bool mcpm_cpu_can_disable(unsigned int cpu)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun /* We assume all CPUs may be shut down. */
68*4882a593Smuzhiyun return true;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
mcpm_cpu_die(unsigned int cpu)71*4882a593Smuzhiyun static void mcpm_cpu_die(unsigned int cpu)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun unsigned int mpidr, pcpu, pcluster;
74*4882a593Smuzhiyun mpidr = read_cpuid_mpidr();
75*4882a593Smuzhiyun pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
76*4882a593Smuzhiyun pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
77*4882a593Smuzhiyun mcpm_set_entry_vector(pcpu, pcluster, NULL);
78*4882a593Smuzhiyun mcpm_cpu_power_down();
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun #endif
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun static const struct smp_operations mcpm_smp_ops __initconst = {
84*4882a593Smuzhiyun .smp_boot_secondary = mcpm_boot_secondary,
85*4882a593Smuzhiyun .smp_secondary_init = mcpm_secondary_init,
86*4882a593Smuzhiyun #ifdef CONFIG_HOTPLUG_CPU
87*4882a593Smuzhiyun .cpu_kill = mcpm_cpu_kill,
88*4882a593Smuzhiyun .cpu_can_disable = mcpm_cpu_can_disable,
89*4882a593Smuzhiyun .cpu_die = mcpm_cpu_die,
90*4882a593Smuzhiyun #endif
91*4882a593Smuzhiyun };
92*4882a593Smuzhiyun
mcpm_smp_set_ops(void)93*4882a593Smuzhiyun void __init mcpm_smp_set_ops(void)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun smp_set_ops(&mcpm_smp_ops);
96*4882a593Smuzhiyun }
97