1 /*
2 * SMP support for Celleb platform. (Incomplete)
3 *
4 * (C) Copyright 2006 TOSHIBA CORPORATION
5 *
6 * This code is based on arch/powerpc/platforms/cell/smp.c:
7 * Dave Engebretsen, Peter Bergner, and
8 * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
9 * Plus various changes from other IBM teams...
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 */
25
26 #undef DEBUG
27
28 #include <linux/kernel.h>
29 #include <linux/smp.h>
30 #include <linux/interrupt.h>
31 #include <linux/init.h>
32 #include <linux/threads.h>
33 #include <linux/cpu.h>
34
35 #include <asm/irq.h>
36 #include <asm/smp.h>
37 #include <asm/machdep.h>
38 #include <asm/udbg.h>
39
40 #include "beat_interrupt.h"
41
42 #ifdef DEBUG
43 #define DBG(fmt...) udbg_printf(fmt)
44 #else
45 #define DBG(fmt...)
46 #endif
47
48 /*
49 * The primary thread of each non-boot processor is recorded here before
50 * smp init.
51 */
52 /* static cpumask_t of_spin_map; */
53
54 /**
55 * smp_startup_cpu() - start the given cpu
56 *
57 * At boot time, there is nothing to do for primary threads which were
58 * started from Open Firmware. For anything else, call RTAS with the
59 * appropriate start location.
60 *
61 * Returns:
62 * 0 - failure
63 * 1 - success
64 */
smp_startup_cpu(unsigned int lcpu)65 static inline int __devinit smp_startup_cpu(unsigned int lcpu)
66 {
67 return 0;
68 }
69
smp_beatic_message_pass(int target,int msg)70 static void smp_beatic_message_pass(int target, int msg)
71 {
72 unsigned int i;
73
74 if (target < NR_CPUS) {
75 beatic_cause_IPI(target, msg);
76 } else {
77 for_each_online_cpu(i) {
78 if (target == MSG_ALL_BUT_SELF
79 && i == smp_processor_id())
80 continue;
81 beatic_cause_IPI(i, msg);
82 }
83 }
84 }
85
smp_beatic_probe(void)86 static int __init smp_beatic_probe(void)
87 {
88 return cpus_weight(cpu_possible_map);
89 }
90
smp_beatic_setup_cpu(int cpu)91 static void __devinit smp_beatic_setup_cpu(int cpu)
92 {
93 beatic_setup_cpu(cpu);
94 }
95
smp_celleb_kick_cpu(int nr)96 static void __devinit smp_celleb_kick_cpu(int nr)
97 {
98 BUG_ON(nr < 0 || nr >= NR_CPUS);
99
100 if (!smp_startup_cpu(nr))
101 return;
102 }
103
smp_celleb_cpu_bootable(unsigned int nr)104 static int smp_celleb_cpu_bootable(unsigned int nr)
105 {
106 return 1;
107 }
108 static struct smp_ops_t bpa_beatic_smp_ops = {
109 .message_pass = smp_beatic_message_pass,
110 .probe = smp_beatic_probe,
111 .kick_cpu = smp_celleb_kick_cpu,
112 .setup_cpu = smp_beatic_setup_cpu,
113 .cpu_bootable = smp_celleb_cpu_bootable,
114 };
115
116 /* This is called very early */
smp_init_celleb(void)117 void __init smp_init_celleb(void)
118 {
119 DBG(" -> smp_init_celleb()\n");
120
121 smp_ops = &bpa_beatic_smp_ops;
122
123 DBG(" <- smp_init_celleb()\n");
124 }
125