aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/mips-boards/malta/malta_smp.c
blob: cf967170fe295ebaa4e191b47c16f925a0c7ab3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
/*
 * Malta Platform-specific hooks for SMP operation
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>

#include <asm/atomic.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
#ifdef CONFIG_MIPS_MT_SMTC
#include <asm/smtc_ipi.h>
#endif /* CONFIG_MIPS_MT_SMTC */

/* VPE/SMP Prototype implements platform interfaces directly */
#if !defined(CONFIG_MIPS_MT_SMP)

/*
 * Cause the specified action to be performed on a targeted "CPU"
 */

void core_send_ipi(int cpu, unsigned int action)
{
/* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
#ifdef CONFIG_MIPS_MT_SMTC
	smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Platform "CPU" startup hook
 */

void prom_boot_secondary(int cpu, struct task_struct *idle)
{
#ifdef CONFIG_MIPS_MT_SMTC
	smtc_boot_secondary(cpu, idle);
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Post-config but pre-boot cleanup entry point
 */

void prom_init_secondary(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
        void smtc_init_secondary(void);
	int myvpe;

	/* Don't enable Malta I/O interrupts (IP2) for secondary VPEs */
	myvpe = read_c0_tcbind() & TCBIND_CURVPE;
	if (myvpe != 0) {
		/* Ideally, this should be done only once per VPE, but... */
		clear_c0_status(STATUSF_IP2);
		set_c0_status(STATUSF_IP0 | STATUSF_IP1 | STATUSF_IP3
				| STATUSF_IP4 | STATUSF_IP5 | STATUSF_IP6
				| STATUSF_IP7);
	}

        smtc_init_secondary();
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Platform SMP pre-initialization
 *
 * As noted above, we can assume a single CPU for now
 * but it may be multithreaded.
 */

void plat_smp_setup(void)
{
	if (read_c0_config3() & (1<<2))
		mipsmt_build_cpu_map(0);
}

void __init plat_prepare_cpus(unsigned int max_cpus)
{
	if (read_c0_config3() & (1<<2))
		mipsmt_prepare_cpus();
}

/*
 * SMP initialization finalization entry point
 */

void prom_smp_finish(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	smtc_smp_finish();
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Hook for after all CPUs are online
 */

void prom_cpus_done(void)
{
}

#endif /* CONFIG_MIPS32R2_MT_SMP */