1 /* 2 * SMP support for R-Mobile / SH-Mobile 3 * 4 * Copyright (C) 2010 Magnus Damm 5 * Copyright (C) 2011 Paul Mundt 6 * 7 * Based on vexpress, Copyright (C) 2002 ARM Ltd, All Rights Reserved 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 #include <linux/init.h> 14 #include <linux/errno.h> 15 #include <linux/delay.h> 16 #include <linux/device.h> 17 #include <linux/smp.h> 18 #include <linux/io.h> 19 #include <asm/hardware/gic.h> 20 #include <asm/localtimer.h> 21 #include <asm/mach-types.h> 22 #include <mach/common.h> 23 24 #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2()) 25 #define is_r8a7779() machine_is_marzen() 26 27 static unsigned int __init shmobile_smp_get_core_count(void) 28 { 29 if (is_sh73a0()) 30 return sh73a0_get_core_count(); 31 32 if (is_r8a7779()) 33 return r8a7779_get_core_count(); 34 35 return 1; 36 } 37 38 static void __init shmobile_smp_prepare_cpus(void) 39 { 40 if (is_sh73a0()) 41 sh73a0_smp_prepare_cpus(); 42 43 if (is_r8a7779()) 44 r8a7779_smp_prepare_cpus(); 45 } 46 47 int shmobile_platform_cpu_kill(unsigned int cpu) 48 { 49 if (is_r8a7779()) 50 return r8a7779_platform_cpu_kill(cpu); 51 52 return 1; 53 } 54 55 void __cpuinit platform_secondary_init(unsigned int cpu) 56 { 57 trace_hardirqs_off(); 58 59 if (is_sh73a0()) 60 sh73a0_secondary_init(cpu); 61 62 if (is_r8a7779()) 63 r8a7779_secondary_init(cpu); 64 } 65 66 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) 67 { 68 if (is_sh73a0()) 69 return sh73a0_boot_secondary(cpu); 70 71 if (is_r8a7779()) 72 return r8a7779_boot_secondary(cpu); 73 74 return -ENOSYS; 75 } 76 77 void __init smp_init_cpus(void) 78 { 79 unsigned int ncores = shmobile_smp_get_core_count(); 80 unsigned int i; 81 82 if (ncores > nr_cpu_ids) { 83 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", 84 ncores, nr_cpu_ids); 85 ncores = nr_cpu_ids; 86 } 87 88 for (i = 0; i < ncores; i++) 89 set_cpu_possible(i, true); 90 91 set_smp_cross_call(gic_raise_softirq); 92 } 93 94 void __init platform_smp_prepare_cpus(unsigned int max_cpus) 95 { 96 shmobile_smp_prepare_cpus(); 97 } 98