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 <linux/of.h> 20 #include <asm/hardware/gic.h> 21 #include <asm/mach-types.h> 22 #include <mach/common.h> 23 #include <mach/emev2.h> 24 25 #ifdef CONFIG_ARCH_SH73A0 26 #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2() || \ 27 of_machine_is_compatible("renesas,sh73a0")) 28 #else 29 #define is_sh73a0() (0) 30 #endif 31 32 #define is_r8a7779() machine_is_marzen() 33 34 #ifdef CONFIG_ARCH_EMEV2 35 #define is_emev2() of_machine_is_compatible("renesas,emev2") 36 #else 37 #define is_emev2() (0) 38 #endif 39 40 static unsigned int __init shmobile_smp_get_core_count(void) 41 { 42 if (is_sh73a0()) 43 return sh73a0_get_core_count(); 44 45 if (is_r8a7779()) 46 return r8a7779_get_core_count(); 47 48 if (is_emev2()) 49 return emev2_get_core_count(); 50 51 return 1; 52 } 53 54 static void __init shmobile_smp_prepare_cpus(void) 55 { 56 if (is_sh73a0()) 57 sh73a0_smp_prepare_cpus(); 58 59 if (is_r8a7779()) 60 r8a7779_smp_prepare_cpus(); 61 62 if (is_emev2()) 63 emev2_smp_prepare_cpus(); 64 } 65 66 int shmobile_platform_cpu_kill(unsigned int cpu) 67 { 68 if (is_r8a7779()) 69 return r8a7779_platform_cpu_kill(cpu); 70 71 if (is_emev2()) 72 return emev2_platform_cpu_kill(cpu); 73 74 return 1; 75 } 76 77 void __cpuinit platform_secondary_init(unsigned int cpu) 78 { 79 trace_hardirqs_off(); 80 81 if (is_sh73a0()) 82 sh73a0_secondary_init(cpu); 83 84 if (is_r8a7779()) 85 r8a7779_secondary_init(cpu); 86 87 if (is_emev2()) 88 emev2_secondary_init(cpu); 89 } 90 91 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) 92 { 93 if (is_sh73a0()) 94 return sh73a0_boot_secondary(cpu); 95 96 if (is_r8a7779()) 97 return r8a7779_boot_secondary(cpu); 98 99 if (is_emev2()) 100 return emev2_boot_secondary(cpu); 101 102 return -ENOSYS; 103 } 104 105 void __init smp_init_cpus(void) 106 { 107 unsigned int ncores = shmobile_smp_get_core_count(); 108 unsigned int i; 109 110 if (ncores > nr_cpu_ids) { 111 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", 112 ncores, nr_cpu_ids); 113 ncores = nr_cpu_ids; 114 } 115 116 for (i = 0; i < ncores; i++) 117 set_cpu_possible(i, true); 118 119 set_smp_cross_call(gic_raise_softirq); 120 } 121 122 void __init platform_smp_prepare_cpus(unsigned int max_cpus) 123 { 124 shmobile_smp_prepare_cpus(); 125 } 126