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7#include <linux/cpu.h>
8#include <linux/delay.h>
9#include <linux/init.h>
10#include <linux/io.h>
11#include <linux/smp.h>
12#include <asm/cacheflush.h>
13#include <asm/smp_plat.h>
14#include <asm/smp_scu.h>
15#include "common.h"
16
17
18static phys_addr_t shmobile_scu_base_phys;
19static void __iomem *shmobile_scu_base;
20
21static int shmobile_scu_cpu_prepare(unsigned int cpu)
22{
23
24 shmobile_smp_hook(cpu, __pa_symbol(shmobile_boot_scu),
25 shmobile_scu_base_phys);
26 return 0;
27}
28
29void __init shmobile_smp_scu_prepare_cpus(phys_addr_t scu_base_phys,
30 unsigned int max_cpus)
31{
32
33 shmobile_boot_fn = __pa_symbol(shmobile_smp_boot);
34
35
36 shmobile_scu_base_phys = scu_base_phys;
37 shmobile_scu_base = ioremap(scu_base_phys, PAGE_SIZE);
38 scu_enable(shmobile_scu_base);
39 scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
40
41
42 cpuhp_setup_state_nocalls(CPUHP_ARM_SHMOBILE_SCU_PREPARE,
43 "arm/shmobile-scu:prepare",
44 shmobile_scu_cpu_prepare, NULL);
45}
46
47#ifdef CONFIG_HOTPLUG_CPU
48void shmobile_smp_scu_cpu_die(unsigned int cpu)
49{
50
51 shmobile_smp_hook(cpu, 0, 0);
52
53 dsb();
54 flush_cache_all();
55
56
57 scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF);
58
59
60 shmobile_smp_sleep();
61}
62
63static int shmobile_smp_scu_psr_core_disabled(int cpu)
64{
65 unsigned long mask = SCU_PM_POWEROFF << (cpu * 8);
66
67 if ((__raw_readl(shmobile_scu_base + 8) & mask) == mask)
68 return 1;
69
70 return 0;
71}
72
73int shmobile_smp_scu_cpu_kill(unsigned int cpu)
74{
75 int k;
76
77
78
79
80
81 for (k = 0; k < 1000; k++) {
82 if (shmobile_smp_scu_psr_core_disabled(cpu))
83 return 1;
84
85 mdelay(1);
86 }
87
88 return 0;
89}
90#endif
91