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 WUPCR IOMEM(0xe6151010) 20 #define SRESCR IOMEM(0xe6151018) 21 #define PSTR IOMEM(0xe6151040) 22 #define SBAR IOMEM(0xe6180020) 23 #define APARMBAREA IOMEM(0xe6f10020) 24 25 #define SH73A0_SCU_BASE 0xf0000000 26 27 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 28 { 29 unsigned int lcpu = cpu_logical_map(cpu); 30 31 if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) 32 __raw_writel(1 << lcpu, WUPCR); /* wake up */ 33 else 34 __raw_writel(1 << lcpu, SRESCR); /* reset */ 35 36 return 0; 37 } 38 39 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 40 { 41 /* Map the reset vector (in headsmp.S) */ 42 __raw_writel(0, APARMBAREA); /* 4k */ 43 __raw_writel(__pa(shmobile_boot_vector), SBAR); 44 45 /* setup sh73a0 specific SCU bits */ 46 shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); 47 } 48 49 const struct smp_operations sh73a0_smp_ops __initconst = { 50 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 51 .smp_boot_secondary = sh73a0_boot_secondary, 52 #ifdef CONFIG_HOTPLUG_CPU 53 .cpu_can_disable = shmobile_smp_cpu_can_disable, 54 .cpu_die = shmobile_smp_scu_cpu_die, 55 .cpu_kill = shmobile_smp_scu_cpu_kill, 56 #endif 57 }; 58