81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SMP support for R-Mobile / SH-Mobile - r8a7779 portion
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*
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* Copyright (C) 2011 Renesas Solutions Corp.
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* Copyright (C) 2011 Magnus Damm
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/soc/renesas/rcar-sysc.h>
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#include <asm/cacheflush.h>
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#include <asm/smp_plat.h>
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#include <asm/smp_scu.h>
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#include "common.h"
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#include "r8a7779.h"
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#define HPBREG_BASE 0xfe700000
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#define AVECR 0x0040 /* ARM Reset Vector Address Register */
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#define R8A7779_SCU_BASE 0xf0000000
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static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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int ret = -EIO;
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cpu = cpu_logical_map(cpu);
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if (cpu)
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ret = rcar_sysc_power_up_cpu(cpu);
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return ret;
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}
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static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
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{
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void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
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/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
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writel(__pa(shmobile_boot_vector), base + AVECR);
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/* setup r8a7779 specific SCU bits */
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shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
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iounmap(base);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static int r8a7779_platform_cpu_kill(unsigned int cpu)
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{
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int ret = -EIO;
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cpu = cpu_logical_map(cpu);
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if (cpu)
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ret = rcar_sysc_power_down_cpu(cpu);
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return ret ? ret : 1;
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}
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static int r8a7779_cpu_kill(unsigned int cpu)
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{
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if (shmobile_smp_scu_cpu_kill(cpu))
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return r8a7779_platform_cpu_kill(cpu);
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return 0;
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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const struct smp_operations r8a7779_smp_ops __initconst = {
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.smp_prepare_cpus = r8a7779_smp_prepare_cpus,
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.smp_boot_secondary = r8a7779_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = shmobile_smp_scu_cpu_die,
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.cpu_kill = r8a7779_cpu_kill,
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#endif
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};
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