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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 "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 | */ | |
65 | static inline int __devinit smp_startup_cpu(unsigned int lcpu) | |
66 | { | |
67 | return 0; | |
68 | } | |
69 | ||
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 | ||
86 | static int __init smp_beatic_probe(void) | |
87 | { | |
88 | return cpus_weight(cpu_possible_map); | |
89 | } | |
90 | ||
91 | static void __devinit smp_beatic_setup_cpu(int cpu) | |
92 | { | |
93 | beatic_setup_cpu(cpu); | |
94 | } | |
95 | ||
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 | ||
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 */ | |
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 | } |