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 
29 extern 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 
37 static void __init
38 smp_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 
59 static int __init
60 smp_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 
100 static void __init
101 smp_86xx_setup_cpu(int cpu_nr)
102 {
103 	mpic_setup_this_cpu();
104 }
105 
106 
107 struct smp_ops_t smp_86xx_ops = {
108 	.cause_nmi_ipi = NULL,
109 	.message_pass = smp_mpic_message_pass,
110 	.probe = smp_mpic_probe,
111 	.kick_cpu = smp_86xx_kick_cpu,
112 	.setup_cpu = smp_86xx_setup_cpu,
113 	.take_timebase = smp_generic_take_timebase,
114 	.give_timebase = smp_generic_give_timebase,
115 };
116 
117 
118 void __init
119 mpc86xx_smp_init(void)
120 {
121 	smp_ops = &smp_86xx_ops;
122 }
123