/* * 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 <asm/cacheflush.h> #include <asm/smp_plat.h> #include <asm/smp_scu.h> #include "common.h" #include "pm-rcar.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); shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); shmobile_boot_arg = (unsigned long)shmobile_scu_base; /* setup r8a7779 specific SCU bits */ shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); shmobile_smp_scu_prepare_cpus(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 */ struct smp_operations r8a7779_smp_ops __initdata = { .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 };