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 32 static 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 45 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 46 { 47 void __iomem *ap, *sysc; 48 49 if (!request_mem_region(0, SZ_4K, "Boot Area")) { 50 pr_err("Failed to request boot area\n"); 51 return; 52 } 53 54 /* Map the reset vector (in headsmp.S) */ 55 ap = ioremap(AP_BASE, PAGE_SIZE); 56 sysc = ioremap(SYSC_BASE, PAGE_SIZE); 57 writel(0, ap + APARMBAREA); /* 4k */ 58 writel(__pa(shmobile_boot_vector), sysc + SBAR); 59 iounmap(sysc); 60 iounmap(ap); 61 62 /* setup sh73a0 specific SCU bits */ 63 shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); 64 } 65 66 const struct smp_operations sh73a0_smp_ops __initconst = { 67 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 68 .smp_boot_secondary = sh73a0_boot_secondary, 69 #ifdef CONFIG_HOTPLUG_CPU 70 .cpu_can_disable = shmobile_smp_cpu_can_disable, 71 .cpu_die = shmobile_smp_scu_cpu_die, 72 .cpu_kill = shmobile_smp_scu_cpu_kill, 73 #endif 74 }; 75