1 /* 2 * SMP support for R-Mobile / SH-Mobile - sh73a0 portion 3 * 4 * Copyright (C) 2010 Magnus Damm 5 * Copyright (C) 2010 Takashi Yoshii 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; version 2 of the License. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/smp.h> 19 #include <linux/io.h> 20 #include <linux/delay.h> 21 22 #include <asm/smp_plat.h> 23 #include <asm/smp_twd.h> 24 25 #include "common.h" 26 #include "sh73a0.h" 27 28 #define WUPCR IOMEM(0xe6151010) 29 #define SRESCR IOMEM(0xe6151018) 30 #define PSTR IOMEM(0xe6151040) 31 #define SBAR IOMEM(0xe6180020) 32 #define APARMBAREA IOMEM(0xe6f10020) 33 34 #define SH73A0_SCU_BASE 0xf0000000 35 36 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 37 { 38 unsigned int lcpu = cpu_logical_map(cpu); 39 40 if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) 41 __raw_writel(1 << lcpu, WUPCR); /* wake up */ 42 else 43 __raw_writel(1 << lcpu, SRESCR); /* reset */ 44 45 return 0; 46 } 47 48 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 49 { 50 /* Map the reset vector (in headsmp.S) */ 51 __raw_writel(0, APARMBAREA); /* 4k */ 52 __raw_writel(__pa(shmobile_boot_vector), SBAR); 53 54 /* setup sh73a0 specific SCU bits */ 55 shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); 56 } 57 58 const struct smp_operations sh73a0_smp_ops __initconst = { 59 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 60 .smp_boot_secondary = sh73a0_boot_secondary, 61 #ifdef CONFIG_HOTPLUG_CPU 62 .cpu_can_disable = shmobile_smp_cpu_can_disable, 63 .cpu_die = shmobile_smp_scu_cpu_die, 64 .cpu_kill = shmobile_smp_scu_cpu_kill, 65 #endif 66 }; 67