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68 lines
1.9 KiB
68 lines
1.9 KiB
// 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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