Ishizaki Kou | c347b79 | 2007-02-02 16:47:17 +0900 | [diff] [blame] | 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 | |
Ishizaki Kou | ad2c698 | 2008-04-24 19:31:40 +1000 | [diff] [blame] | 40 | #include "beat_interrupt.h" |
Ishizaki Kou | c347b79 | 2007-02-02 16:47:17 +0900 | [diff] [blame] | 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 | } |