summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/85xx/smp.c
blob: 62c592ede641c4a374a7760fd67604cfc9b2f9de (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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
 * Author: Andy Fleming <afleming@freescale.com>
 * 	   Kumar Gala <galak@kernel.crashing.org>
 *
 * Copyright 2006-2008 Freescale Semiconductor Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/of.h>

#include <asm/machdep.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/mpic.h>
#include <asm/cacheflush.h>
#include <asm/dbell.h>

#include <sysdev/fsl_soc.h>

extern volatile unsigned long __secondary_hold_acknowledge;
extern void __early_start(void);

#define BOOT_ENTRY_ADDR_UPPER	0
#define BOOT_ENTRY_ADDR_LOWER	1
#define BOOT_ENTRY_R3_UPPER	2
#define BOOT_ENTRY_R3_LOWER	3
#define BOOT_ENTRY_RESV		4
#define BOOT_ENTRY_PIR		5
#define BOOT_ENTRY_R6_UPPER	6
#define BOOT_ENTRY_R6_LOWER	7
#define NUM_BOOT_ENTRY		8
#define SIZE_BOOT_ENTRY		(NUM_BOOT_ENTRY * sizeof(u32))

static void __init
smp_85xx_kick_cpu(int nr)
{
	unsigned long flags;
	const u64 *cpu_rel_addr;
	__iomem u32 *bptr_vaddr;
	struct device_node *np;
	int n = 0;

	WARN_ON (nr < 0 || nr >= NR_CPUS);

	pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);

	np = of_get_cpu_node(nr, NULL);
	cpu_rel_addr = of_get_property(np, "cpu-release-addr", NULL);

	if (cpu_rel_addr == NULL) {
		printk(KERN_ERR "No cpu-release-addr for cpu %d\n", nr);
		return;
	}

	/* Map the spin table */
	bptr_vaddr = ioremap(*cpu_rel_addr, SIZE_BOOT_ENTRY);

	local_irq_save(flags);

	out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
	out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));

	/* Wait a bit for the CPU to ack. */
	while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
		mdelay(1);

	local_irq_restore(flags);

	iounmap(bptr_vaddr);

	pr_debug("waited %d msecs for CPU #%d.\n", n, nr);
}

static void __init
smp_85xx_basic_setup(int cpu_nr)
{
	/* Clear any pending timer interrupts */
	mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);

	/* Enable decrementer interrupt */
	mtspr(SPRN_TCR, TCR_DIE);
}

static void __init
smp_85xx_setup_cpu(int cpu_nr)
{
	mpic_setup_this_cpu();

	smp_85xx_basic_setup(cpu_nr);
}

struct smp_ops_t smp_85xx_ops = {
	.kick_cpu = smp_85xx_kick_cpu,
};

static int __init smp_dummy_probe(void)
{
	return NR_CPUS;
}

void __init mpc85xx_smp_init(void)
{
	struct device_node *np;

	smp_85xx_ops.message_pass = NULL;

	np = of_find_node_by_type(NULL, "open-pic");
	if (np) {
		smp_85xx_ops.probe = smp_mpic_probe;
		smp_85xx_ops.setup_cpu = smp_85xx_setup_cpu;
		smp_85xx_ops.message_pass = smp_mpic_message_pass;
	} else {
		smp_85xx_ops.probe = smp_dummy_probe;
		smp_85xx_ops.setup_cpu = smp_85xx_basic_setup;
	}

	if (cpu_has_feature(CPU_FTR_DBELL))
		smp_85xx_ops.message_pass = smp_dbell_message_pass;

	BUG_ON(!smp_85xx_ops.message_pass);

	smp_ops = &smp_85xx_ops;
}
OpenPOWER on IntegriCloud