69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* SMP support for R-Mobile / SH-Mobile - sh73a0 portion
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2010 Takashi Yoshii
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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/io.h>
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#include <linux/delay.h>
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#include <asm/smp_plat.h>
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#include "common.h"
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#include "sh73a0.h"
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#define CPG_BASE2 0xe6151000
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#define WUPCR 0x10 /* System-CPU Wake Up Control Register */
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#define SRESCR 0x18 /* System-CPU Software Reset Control Register */
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#define PSTR 0x40 /* System-CPU Power Status Register */
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#define SYSC_BASE 0xe6180000
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#define SBAR 0x20 /* SYS Boot Address Register */
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#define AP_BASE 0xe6f10000
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#define APARMBAREA 0x20 /* Address Translation Area Register */
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#define SH73A0_SCU_BASE 0xf0000000
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static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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unsigned int lcpu = cpu_logical_map(cpu);
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void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE);
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if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3)
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writel(1 << lcpu, cpg2 + WUPCR); /* wake up */
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else
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writel(1 << lcpu, cpg2 + SRESCR); /* reset */
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iounmap(cpg2);
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return 0;
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}
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static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
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{
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void __iomem *ap = ioremap(AP_BASE, PAGE_SIZE);
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void __iomem *sysc = ioremap(SYSC_BASE, PAGE_SIZE);
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/* Map the reset vector (in headsmp.S) */
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writel(0, ap + APARMBAREA); /* 4k */
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writel(__pa(shmobile_boot_vector), sysc + SBAR);
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iounmap(sysc);
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iounmap(ap);
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/* setup sh73a0 specific SCU bits */
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shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
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}
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const struct smp_operations sh73a0_smp_ops __initconst = {
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.smp_prepare_cpus = sh73a0_smp_prepare_cpus,
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.smp_boot_secondary = sh73a0_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_can_disable = shmobile_smp_cpu_can_disable,
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.cpu_die = shmobile_smp_scu_cpu_die,
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.cpu_kill = shmobile_smp_scu_cpu_kill,
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#endif
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};
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