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/mpc86xx.h>
24 #include <asm/cacheflush.h>
25 
26 #include <sysdev/fsl_soc.h>
27 
28 #include "mpc86xx.h"
29 
30 extern void __secondary_start_mpc86xx(void);
31 extern unsigned long __secondary_hold_acknowledge;
32 
33 
34 static void __init
35 smp_86xx_release_core(int nr)
36 {
37 	__be32 __iomem *mcm_vaddr;
38 	unsigned long pcr;
39 
40 	if (nr < 0 || nr >= NR_CPUS)
41 		return;
42 
43 	/*
44 	 * Startup Core #nr.
45 	 */
46 	mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
47 			    MPC86xx_MCM_SIZE);
48 	pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
49 	pcr |= 1 << (nr + 24);
50 	out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
51 }
52 
53 
54 static void __init
55 smp_86xx_kick_cpu(int nr)
56 {
57 	unsigned int save_vector;
58 	unsigned long target, flags;
59 	int n = 0;
60 	unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
61 
62 	if (nr < 0 || nr >= NR_CPUS)
63 		return;
64 
65 	pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
66 
67 	local_irq_save(flags);
68 
69 	/* Save reset vector */
70 	save_vector = *vector;
71 
72 	/* Setup fake reset vector to call __secondary_start_mpc86xx. */
73 	target = (unsigned long) __secondary_start_mpc86xx;
74 	patch_branch(vector, target, BRANCH_SET_LINK);
75 
76 	/* Kick that CPU */
77 	smp_86xx_release_core(nr);
78 
79 	/* Wait a bit for the CPU to take the exception. */
80 	while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
81 		mdelay(1);
82 
83 	/* Restore the exception vector */
84 	*vector = save_vector;
85 	flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
86 
87 	local_irq_restore(flags);
88 
89 	pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
90 }
91 
92 
93 static void __init
94 smp_86xx_setup_cpu(int cpu_nr)
95 {
96 	mpic_setup_this_cpu();
97 }
98 
99 
100 struct smp_ops_t smp_86xx_ops = {
101 	.message_pass = smp_mpic_message_pass,
102 	.probe = smp_mpic_probe,
103 	.kick_cpu = smp_86xx_kick_cpu,
104 	.setup_cpu = smp_86xx_setup_cpu,
105 	.take_timebase = smp_generic_take_timebase,
106 	.give_timebase = smp_generic_give_timebase,
107 };
108 
109 
110 void __init
111 mpc86xx_smp_init(void)
112 {
113 	smp_ops = &smp_86xx_ops;
114 }
115