| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 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/mach-types.h> |
| 21 | #include <mach/common.h> |
| 22 | |
| 23 | #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2()) |
| 24 | #define is_r8a7779() machine_is_marzen() |
| 25 | |
| 26 | static unsigned int __init shmobile_smp_get_core_count(void) |
| 27 | { |
| 28 | if (is_sh73a0()) |
| 29 | return sh73a0_get_core_count(); |
| 30 | |
| 31 | if (is_r8a7779()) |
| 32 | return r8a7779_get_core_count(); |
| 33 | |
| 34 | return 1; |
| 35 | } |
| 36 | |
| 37 | static void __init shmobile_smp_prepare_cpus(void) |
| 38 | { |
| 39 | if (is_sh73a0()) |
| 40 | sh73a0_smp_prepare_cpus(); |
| 41 | |
| 42 | if (is_r8a7779()) |
| 43 | r8a7779_smp_prepare_cpus(); |
| 44 | } |
| 45 | |
| 46 | int shmobile_platform_cpu_kill(unsigned int cpu) |
| 47 | { |
| 48 | if (is_r8a7779()) |
| 49 | return r8a7779_platform_cpu_kill(cpu); |
| 50 | |
| 51 | return 1; |
| 52 | } |
| 53 | |
| 54 | void __cpuinit platform_secondary_init(unsigned int cpu) |
| 55 | { |
| 56 | trace_hardirqs_off(); |
| 57 | |
| 58 | if (is_sh73a0()) |
| 59 | sh73a0_secondary_init(cpu); |
| 60 | |
| 61 | if (is_r8a7779()) |
| 62 | r8a7779_secondary_init(cpu); |
| 63 | } |
| 64 | |
| 65 | int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 66 | { |
| 67 | if (is_sh73a0()) |
| 68 | return sh73a0_boot_secondary(cpu); |
| 69 | |
| 70 | if (is_r8a7779()) |
| 71 | return r8a7779_boot_secondary(cpu); |
| 72 | |
| 73 | return -ENOSYS; |
| 74 | } |
| 75 | |
| 76 | void __init smp_init_cpus(void) |
| 77 | { |
| 78 | unsigned int ncores = shmobile_smp_get_core_count(); |
| 79 | unsigned int i; |
| 80 | |
| 81 | if (ncores > nr_cpu_ids) { |
| 82 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", |
| 83 | ncores, nr_cpu_ids); |
| 84 | ncores = nr_cpu_ids; |
| 85 | } |
| 86 | |
| 87 | for (i = 0; i < ncores; i++) |
| 88 | set_cpu_possible(i, true); |
| 89 | |
| 90 | set_smp_cross_call(gic_raise_softirq); |
| 91 | } |
| 92 | |
| 93 | void __init platform_smp_prepare_cpus(unsigned int max_cpus) |
| 94 | { |
| 95 | shmobile_smp_prepare_cpus(); |
| 96 | } |