smp-sh73a0.c (1911B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * SMP support for R-Mobile / SH-Mobile - sh73a0 portion 4 * 5 * Copyright (C) 2010 Magnus Damm 6 * Copyright (C) 2010 Takashi Yoshii 7 */ 8#include <linux/kernel.h> 9#include <linux/init.h> 10#include <linux/smp.h> 11#include <linux/io.h> 12#include <linux/delay.h> 13 14#include <asm/smp_plat.h> 15 16#include "common.h" 17#include "sh73a0.h" 18 19#define CPG_BASE2 0xe6151000 20#define WUPCR 0x10 /* System-CPU Wake Up Control Register */ 21#define SRESCR 0x18 /* System-CPU Software Reset Control Register */ 22#define PSTR 0x40 /* System-CPU Power Status Register */ 23 24#define SYSC_BASE 0xe6180000 25#define SBAR 0x20 /* SYS Boot Address Register */ 26 27#define AP_BASE 0xe6f10000 28#define APARMBAREA 0x20 /* Address Translation Area Register */ 29 30#define SH73A0_SCU_BASE 0xf0000000 31 32static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 33{ 34 unsigned int lcpu = cpu_logical_map(cpu); 35 void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE); 36 37 if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3) 38 writel(1 << lcpu, cpg2 + WUPCR); /* wake up */ 39 else 40 writel(1 << lcpu, cpg2 + SRESCR); /* reset */ 41 iounmap(cpg2); 42 return 0; 43} 44 45static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 46{ 47 void __iomem *ap = ioremap(AP_BASE, PAGE_SIZE); 48 void __iomem *sysc = ioremap(SYSC_BASE, PAGE_SIZE); 49 50 /* Map the reset vector (in headsmp.S) */ 51 writel(0, ap + APARMBAREA); /* 4k */ 52 writel(__pa(shmobile_boot_vector), sysc + SBAR); 53 iounmap(sysc); 54 iounmap(ap); 55 56 /* setup sh73a0 specific SCU bits */ 57 shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); 58} 59 60const struct smp_operations sh73a0_smp_ops __initconst = { 61 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 62 .smp_boot_secondary = sh73a0_boot_secondary, 63#ifdef CONFIG_HOTPLUG_CPU 64 .cpu_can_disable = shmobile_smp_cpu_can_disable, 65 .cpu_die = shmobile_smp_scu_cpu_die, 66 .cpu_kill = shmobile_smp_scu_cpu_kill, 67#endif 68};