Merge branch 'upstream/wm8974' into for-2.6.33
[pandora-kernel.git] / arch / powerpc / platforms / 86xx / mpc86xx_smp.c
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 extern unsigned long __secondary_hold_acknowledge;
31
32 #define MCM_PORT_CONFIG_OFFSET  0x10
33
34 /* Offset from CCSRBAR */
35 #define MPC86xx_MCM_OFFSET      (0x1000)
36 #define MPC86xx_MCM_SIZE        (0x1000)
37
38 static void __init
39 smp_86xx_release_core(int nr)
40 {
41         __be32 __iomem *mcm_vaddr;
42         unsigned long pcr;
43
44         if (nr < 0 || nr >= NR_CPUS)
45                 return;
46
47         /*
48          * Startup Core #nr.
49          */
50         mcm_vaddr = ioremap(get_immrbase() + MPC86xx_MCM_OFFSET,
51                             MPC86xx_MCM_SIZE);
52         pcr = in_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2));
53         pcr |= 1 << (nr + 24);
54         out_be32(mcm_vaddr + (MCM_PORT_CONFIG_OFFSET >> 2), pcr);
55
56         iounmap(mcm_vaddr);
57 }
58
59
60 static void __init
61 smp_86xx_kick_cpu(int nr)
62 {
63         unsigned int save_vector;
64         unsigned long target, flags;
65         int n = 0;
66         unsigned int *vector = (unsigned int *)(KERNELBASE + 0x100);
67
68         if (nr < 0 || nr >= NR_CPUS)
69                 return;
70
71         pr_debug("smp_86xx_kick_cpu: kick CPU #%d\n", nr);
72
73         local_irq_save(flags);
74
75         /* Save reset vector */
76         save_vector = *vector;
77
78         /* Setup fake reset vector to call __secondary_start_mpc86xx. */
79         target = (unsigned long) __secondary_start_mpc86xx;
80         patch_branch(vector, target, BRANCH_SET_LINK);
81
82         /* Kick that CPU */
83         smp_86xx_release_core(nr);
84
85         /* Wait a bit for the CPU to take the exception. */
86         while ((__secondary_hold_acknowledge != nr) && (n++, n < 1000))
87                 mdelay(1);
88
89         /* Restore the exception vector */
90         *vector = save_vector;
91         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
92
93         local_irq_restore(flags);
94
95         pr_debug("wait CPU #%d for %d msecs.\n", nr, n);
96 }
97
98
99 static void __init
100 smp_86xx_setup_cpu(int cpu_nr)
101 {
102         mpic_setup_this_cpu();
103 }
104
105
106 struct smp_ops_t smp_86xx_ops = {
107         .message_pass = smp_mpic_message_pass,
108         .probe = smp_mpic_probe,
109         .kick_cpu = smp_86xx_kick_cpu,
110         .setup_cpu = smp_86xx_setup_cpu,
111         .take_timebase = smp_generic_take_timebase,
112         .give_timebase = smp_generic_give_timebase,
113 };
114
115
116 void __init
117 mpc86xx_smp_init(void)
118 {
119         smp_ops = &smp_86xx_ops;
120 }