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 #ifdef CONFIG_HAVE_ARM_TWD 37 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29); 38 void __init sh73a0_register_twd(void) 39 { 40 twd_local_timer_register(&twd_local_timer); 41 } 42 #endif 43 44 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 45 { 46 unsigned int lcpu = cpu_logical_map(cpu); 47 48 if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) 49 __raw_writel(1 << lcpu, WUPCR); /* wake up */ 50 else 51 __raw_writel(1 << lcpu, SRESCR); /* reset */ 52 53 return 0; 54 } 55 56 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 57 { 58 /* Map the reset vector (in headsmp.S) */ 59 __raw_writel(0, APARMBAREA); /* 4k */ 60 __raw_writel(__pa(shmobile_boot_vector), SBAR); 61 62 /* setup sh73a0 specific SCU bits */ 63 shmobile_scu_base = IOMEM(SH73A0_SCU_BASE); 64 shmobile_smp_scu_prepare_cpus(max_cpus); 65 } 66 67 struct smp_operations sh73a0_smp_ops __initdata = { 68 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 69 .smp_boot_secondary = sh73a0_boot_secondary, 70 #ifdef CONFIG_HOTPLUG_CPU 71 .cpu_disable = shmobile_smp_cpu_disable, 72 .cpu_die = shmobile_smp_scu_cpu_die, 73 .cpu_kill = shmobile_smp_scu_cpu_kill, 74 #endif 75 }; 76