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 */ 65static inline int __devinit smp_startup_cpu(unsigned int lcpu) 66{ 67 return 0; 68} 69 70static 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 86static int __init smp_beatic_probe(void) 87{ 88 return cpus_weight(cpu_possible_map); 89} 90 91static void __devinit smp_beatic_setup_cpu(int cpu) 92{ 93 beatic_setup_cpu(cpu); 94} 95 96static 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 104static int smp_celleb_cpu_bootable(unsigned int nr) 105{ 106 return 1; 107} 108static 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 */ 117void __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