1/*
2 * Author: Xianghua Xiao <x.xiao@freescale.com>
3 *         Zhang Wei <wei.zhang@freescale.com>
4 *
5 * Copyright 2006 Freescale Semiconductor Inc.
6 *
7 * This program is free software; you can redistribute  it and/or modify it
8 * under  the terms of  the GNU General  Public License as published by the
9 * Free Software Foundation;  either version 2 of the  License, or (at your
10 * option) any later version.
11 */
12
13#include <linux/stddef.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17
18#include <asm/code-patching.h>
19#include <asm/page.h>
20#include <asm/pgtable.h>
21#include <asm/pci-bridge.h>
22#include <asm/mpic.h>
23#include <asm/cacheflush.h>
24
25#include <sysdev/fsl_soc.h>
26
27#include "mpc86xx.h"
28
29extern void __secondary_start_mpc86xx(void);
30
31#define MCM_PORT_CONFIG_OFFSET	0x10
32
33/* Offset from CCSRBAR */
34#define MPC86xx_MCM_OFFSET      (0x1000)
35#define MPC86xx_MCM_SIZE        (0x1000)
36
37static void __init
38smp_86xx_release_core(int nr)
39{
40	__be32 __iomem *mcm_vaddr;
41	unsigned long pcr;
42
43	if (nr < 0 || nr >= NR_CPUS)
44		return;
45
46	/*
47	 * Startup Core #nr.
48	 */
49	mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
50			    MPC86xx_MCM_SIZE);
51	pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
52	pcr |= 1 << (nr + 24);
53	out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
54
55	iounmap(mcm_vaddr);
56}
57
58
59static int __init
60smp_86xx_kick_cpu(int nr)
61{
62	unsigned int save_vector;
63	unsigned long target, flags;
64	int n = 0;
65	unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
66
67	if (nr < 0 || nr >= NR_CPUS)
68		return -ENOENT;
69
70	pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
71
72	local_irq_save(flags);
73
74	/* Save reset vector */
75	save_vector = *vector;
76
77	/* Setup fake reset vector to call __secondary_start_mpc86xx. */
78	target = (unsigned long) __secondary_start_mpc86xx;
79	patch_branch(vector, target, BRANCH_SET_LINK);
80
81	/* Kick that CPU */
82	smp_86xx_release_core(nr);
83
84	/* Wait a bit for the CPU to take the exception. */
85	while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
86		mdelay(1);
87
88	/* Restore the exception vector */
89	*vector = save_vector;
90	flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
91
92	local_irq_restore(flags);
93
94	pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
95
96	return 0;
97}
98
99
100static void __init
101smp_86xx_setup_cpu(int cpu_nr)
102{
103	mpic_setup_this_cpu();
104}
105
106
107struct smp_ops_t smp_86xx_ops = {
108	.message_pass = smp_mpic_message_pass,
109	.probe = smp_mpic_probe,
110	.kick_cpu = smp_86xx_kick_cpu,
111	.setup_cpu = smp_86xx_setup_cpu,
112	.take_timebase = smp_generic_take_timebase,
113	.give_timebase = smp_generic_give_timebase,
114};
115
116
117void __init
118mpc86xx_smp_init(void)
119{
120	smp_ops = &smp_86xx_ops;
121}
122