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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Author: Xianghua Xiao <x.xiao@freescale.com>
* Zhang Wei <wei.zhang@freescale.com>
*
* Copyright 2006 Freescale Semiconductor Inc.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/code-patching.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pci-bridge.h>
#include <asm/mpic.h>
#include <asm/cacheflush.h>
#include <asm/inst.h>
#include <sysdev/fsl_soc.h>
#include "mpc86xx.h"
extern void __secondary_start_mpc86xx(void);
#define MCM_PORT_CONFIG_OFFSET 0x10
/* Offset from CCSRBAR */
#define MPC86xx_MCM_OFFSET (0x1000)
#define MPC86xx_MCM_SIZE (0x1000)
static void __init
smp_86xx_release_core(int nr)
{
__be32 __iomem *mcm_vaddr;
unsigned long pcr;
if (nr < 0 || nr >= NR_CPUS)
return;
/*
* Startup Core #nr.
*/
mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
MPC86xx_MCM_SIZE);
pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
pcr |= 1 << (nr + 24);
out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
iounmap(mcm_vaddr);
}
static int __init
smp_86xx_kick_cpu(int nr)
{
unsigned int save_vector;
unsigned long target, flags;
int n = 0;
unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
if (nr < 0 || nr >= NR_CPUS)
return -ENOENT;
pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
local_irq_save(flags);
/* Save reset vector */
save_vector = *vector;
/* Setup fake reset vector to call __secondary_start_mpc86xx. */
target = (unsigned long) __secondary_start_mpc86xx;
patch_branch((struct ppc_inst *)vector, target, BRANCH_SET_LINK);
/* Kick that CPU */
smp_86xx_release_core(nr);
/* Wait a bit for the CPU to take the exception. */
while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
mdelay(1);
/* Restore the exception vector */
patch_instruction((struct ppc_inst *)vector, ppc_inst(save_vector));
local_irq_restore(flags);
pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
return 0;
}
static void __init
smp_86xx_setup_cpu(int cpu_nr)
{
mpic_setup_this_cpu();
}
struct smp_ops_t smp_86xx_ops = {
.cause_nmi_ipi = NULL,
.message_pass = smp_mpic_message_pass,
.probe = smp_mpic_probe,
.kick_cpu = smp_86xx_kick_cpu,
.setup_cpu = smp_86xx_setup_cpu,
.take_timebase = smp_generic_take_timebase,
.give_timebase = smp_generic_give_timebase,
};
void __init
mpc86xx_smp_init(void)
{
smp_ops = &smp_86xx_ops;
}
|
