powerpc: Fix a couple of compile warnings for 32-bit compiles
[linux-2.6.git] / arch / powerpc / platforms / chrp / smp.c
1 /*
2  * Smp support for CHRP machines.
3  *
4  * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
5  * deal of code from the sparc and intel versions.
6  *
7  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
8  *
9  */
10
11 #include <linux/config.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/delay.h>
19 #include <linux/init.h>
20 #include <linux/spinlock.h>
21
22 #include <asm/ptrace.h>
23 #include <asm/atomic.h>
24 #include <asm/irq.h>
25 #include <asm/page.h>
26 #include <asm/pgtable.h>
27 #include <asm/sections.h>
28 #include <asm/io.h>
29 #include <asm/prom.h>
30 #include <asm/smp.h>
31 #include <asm/residual.h>
32 #include <asm/time.h>
33 #include <asm/open_pic.h>
34 #include <asm/machdep.h>
35 #include <asm/smp.h>
36 #include <asm/mpic.h>
37 #include <asm/rtas.h>
38
39 static void __devinit smp_chrp_kick_cpu(int nr)
40 {
41         *(unsigned long *)KERNELBASE = nr;
42         asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory");
43 }
44
45 static void __devinit smp_chrp_setup_cpu(int cpu_nr)
46 {
47         mpic_setup_this_cpu();
48 }
49
50 static DEFINE_SPINLOCK(timebase_lock);
51 static unsigned int timebase_upper = 0, timebase_lower = 0;
52
53 void __devinit smp_chrp_give_timebase(void)
54 {
55         spin_lock(&timebase_lock);
56         rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
57         timebase_upper = get_tbu();
58         timebase_lower = get_tbl();
59         spin_unlock(&timebase_lock);
60
61         while (timebase_upper || timebase_lower)
62                 barrier();
63         rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
64 }
65
66 void __devinit smp_chrp_take_timebase(void)
67 {
68         while (!(timebase_upper || timebase_lower))
69                 barrier();
70         spin_lock(&timebase_lock);
71         set_tb(timebase_upper, timebase_lower);
72         timebase_upper = 0;
73         timebase_lower = 0;
74         spin_unlock(&timebase_lock);
75         printk("CPU %i taken timebase\n", smp_processor_id());
76 }
77
78 /* CHRP with openpic */
79 struct smp_ops_t chrp_smp_ops = {
80         .message_pass = smp_mpic_message_pass,
81         .probe = smp_mpic_probe,
82         .kick_cpu = smp_chrp_kick_cpu,
83         .setup_cpu = smp_chrp_setup_cpu,
84         .give_timebase = smp_chrp_give_timebase,
85         .take_timebase = smp_chrp_take_timebase,
86 };