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 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 #include <linux/kernel.h> 21 #include <linux/init.h> 22 #include <linux/smp.h> 23 #include <linux/io.h> 24 #include <linux/delay.h> 25 #include <mach/common.h> 26 #include <mach/sh73a0.h> 27 #include <asm/smp_plat.h> 28 #include <asm/smp_twd.h> 29 30 #define WUPCR IOMEM(0xe6151010) 31 #define SRESCR IOMEM(0xe6151018) 32 #define PSTR IOMEM(0xe6151040) 33 #define SBAR IOMEM(0xe6180020) 34 #define APARMBAREA IOMEM(0xe6f10020) 35 36 #define SH73A0_SCU_BASE 0xf0000000 37 38 #ifdef CONFIG_HAVE_ARM_TWD 39 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29); 40 void __init sh73a0_register_twd(void) 41 { 42 twd_local_timer_register(&twd_local_timer); 43 } 44 #endif 45 46 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 47 { 48 unsigned int lcpu = cpu_logical_map(cpu); 49 int ret; 50 51 ret = shmobile_smp_scu_boot_secondary(cpu, idle); 52 if (ret) 53 return ret; 54 55 if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) 56 __raw_writel(1 << lcpu, WUPCR); /* wake up */ 57 else 58 __raw_writel(1 << lcpu, SRESCR); /* reset */ 59 60 return 0; 61 } 62 63 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 64 { 65 /* Map the reset vector (in headsmp.S) */ 66 __raw_writel(0, APARMBAREA); /* 4k */ 67 __raw_writel(__pa(shmobile_boot_vector), SBAR); 68 69 /* setup sh73a0 specific SCU bits */ 70 shmobile_scu_base = IOMEM(SH73A0_SCU_BASE); 71 shmobile_smp_scu_prepare_cpus(max_cpus); 72 } 73 74 #ifdef CONFIG_HOTPLUG_CPU 75 static int sh73a0_cpu_disable(unsigned int cpu) 76 { 77 return 0; /* CPU0 and CPU1 supported */ 78 } 79 #endif /* CONFIG_HOTPLUG_CPU */ 80 81 struct smp_operations sh73a0_smp_ops __initdata = { 82 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 83 .smp_boot_secondary = sh73a0_boot_secondary, 84 #ifdef CONFIG_HOTPLUG_CPU 85 .cpu_disable = sh73a0_cpu_disable, 86 .cpu_die = shmobile_smp_scu_cpu_die, 87 .cpu_kill = shmobile_smp_scu_cpu_kill, 88 #endif 89 }; 90