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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | /* * SMP support for R-Mobile / SH-Mobile - r8a7779 portion * * Copyright (C) 2011 Renesas Solutions Corp. * Copyright (C) 2011 Magnus Damm * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/smp.h> #include <linux/spinlock.h> #include <linux/io.h> #include <linux/delay.h> #include <linux/soc/renesas/rcar-sysc.h> #include <asm/cacheflush.h> #include <asm/smp_plat.h> #include <asm/smp_scu.h> #include "common.h" #include "r8a7779.h" #define AVECR IOMEM(0xfe700040) #define R8A7779_SCU_BASE 0xf0000000 static const struct rcar_sysc_ch r8a7779_ch_cpu1 = { .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ .chan_bit = 1, /* ARM1 */ .isr_bit = 1, /* ARM1 */ }; static const struct rcar_sysc_ch r8a7779_ch_cpu2 = { .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ .chan_bit = 2, /* ARM2 */ .isr_bit = 2, /* ARM2 */ }; static const struct rcar_sysc_ch r8a7779_ch_cpu3 = { .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ .chan_bit = 3, /* ARM3 */ .isr_bit = 3, /* ARM3 */ }; static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = { [1] = &r8a7779_ch_cpu1, [2] = &r8a7779_ch_cpu2, [3] = &r8a7779_ch_cpu3, }; static int r8a7779_platform_cpu_kill(unsigned int cpu) { const struct rcar_sysc_ch *ch = NULL; int ret = -EIO; cpu = cpu_logical_map(cpu); if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) ch = r8a7779_ch_cpu[cpu]; if (ch) ret = rcar_sysc_power_down(ch); return ret ? ret : 1; } static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) { const struct rcar_sysc_ch *ch = NULL; unsigned int lcpu = cpu_logical_map(cpu); int ret; if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu)) ch = r8a7779_ch_cpu[lcpu]; if (ch) ret = rcar_sysc_power_up(ch); else ret = -EIO; return ret; } static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) { /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ __raw_writel(__pa(shmobile_boot_vector), AVECR); /* setup r8a7779 specific SCU bits */ shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus); r8a7779_pm_init(); /* power off secondary CPUs */ r8a7779_platform_cpu_kill(1); r8a7779_platform_cpu_kill(2); r8a7779_platform_cpu_kill(3); } #ifdef CONFIG_HOTPLUG_CPU static int r8a7779_cpu_kill(unsigned int cpu) { if (shmobile_smp_scu_cpu_kill(cpu)) return r8a7779_platform_cpu_kill(cpu); return 0; } #endif /* CONFIG_HOTPLUG_CPU */ const struct smp_operations r8a7779_smp_ops __initconst = { .smp_prepare_cpus = r8a7779_smp_prepare_cpus, .smp_boot_secondary = r8a7779_boot_secondary, #ifdef CONFIG_HOTPLUG_CPU .cpu_die = shmobile_smp_scu_cpu_die, .cpu_kill = r8a7779_cpu_kill, #endif }; |