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 #include <asm/smp_twd.h> 16 17 #include "common.h" 18 #include "sh73a0.h" 19 20 #define WUPCR IOMEM(0xe6151010) 21 #define SRESCR IOMEM(0xe6151018) 22 #define PSTR IOMEM(0xe6151040) 23 #define SBAR IOMEM(0xe6180020) 24 #define APARMBAREA IOMEM(0xe6f10020) 25 26 #define SH73A0_SCU_BASE 0xf0000000 27 28 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 29 { 30 unsigned int lcpu = cpu_logical_map(cpu); 31 32 if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) 33 __raw_writel(1 << lcpu, WUPCR); /* wake up */ 34 else 35 __raw_writel(1 << lcpu, SRESCR); /* reset */ 36 37 return 0; 38 } 39 40 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 41 { 42 /* Map the reset vector (in headsmp.S) */ 43 __raw_writel(0, APARMBAREA); /* 4k */ 44 __raw_writel(__pa(shmobile_boot_vector), SBAR); 45 46 /* setup sh73a0 specific SCU bits */ 47 shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); 48 } 49 50 const struct smp_operations sh73a0_smp_ops __initconst = { 51 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 52 .smp_boot_secondary = sh73a0_boot_secondary, 53 #ifdef CONFIG_HOTPLUG_CPU 54 .cpu_can_disable = shmobile_smp_cpu_can_disable, 55 .cpu_die = shmobile_smp_scu_cpu_die, 56 .cpu_kill = shmobile_smp_scu_cpu_kill, 57 #endif 58 }; 59