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/spinlock.h> 24 #include <linux/io.h> 25 #include <linux/delay.h> 26 #include <mach/common.h> 27 #include <asm/cacheflush.h> 28 #include <asm/smp_plat.h> 29 #include <mach/sh73a0.h> 30 #include <asm/smp_scu.h> 31 #include <asm/smp_twd.h> 32 33 #define WUPCR IOMEM(0xe6151010) 34 #define SRESCR IOMEM(0xe6151018) 35 #define PSTR IOMEM(0xe6151040) 36 #define SBAR IOMEM(0xe6180020) 37 #define APARMBAREA IOMEM(0xe6f10020) 38 39 #define PSTR_SHUTDOWN_MODE 3 40 41 #define SH73A0_SCU_BASE 0xf0000000 42 43 #ifdef CONFIG_HAVE_ARM_TWD 44 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29); 45 void __init sh73a0_register_twd(void) 46 { 47 twd_local_timer_register(&twd_local_timer); 48 } 49 #endif 50 51 static int __cpuinit sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) 52 { 53 cpu = cpu_logical_map(cpu); 54 55 if (((__raw_readl(PSTR) >> (4 * cpu)) & 3) == 3) 56 __raw_writel(1 << cpu, WUPCR); /* wake up */ 57 else 58 __raw_writel(1 << cpu, SRESCR); /* reset */ 59 60 return 0; 61 } 62 63 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) 64 { 65 scu_enable(shmobile_scu_base); 66 67 /* Map the reset vector (in headsmp-scu.S) */ 68 __raw_writel(0, APARMBAREA); /* 4k */ 69 __raw_writel(__pa(shmobile_secondary_vector_scu), SBAR); 70 71 /* enable cache coherency on booting CPU */ 72 scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); 73 } 74 75 static void __init sh73a0_smp_init_cpus(void) 76 { 77 /* setup sh73a0 specific SCU base */ 78 shmobile_scu_base = IOMEM(SH73A0_SCU_BASE); 79 80 shmobile_smp_init_cpus(scu_get_core_count(shmobile_scu_base)); 81 } 82 83 #ifdef CONFIG_HOTPLUG_CPU 84 static int sh73a0_cpu_kill(unsigned int cpu) 85 { 86 87 int k; 88 u32 pstr; 89 90 /* 91 * wait until the power status register confirms the shutdown of the 92 * offline target 93 */ 94 for (k = 0; k < 1000; k++) { 95 pstr = (__raw_readl(PSTR) >> (4 * cpu)) & 3; 96 if (pstr == PSTR_SHUTDOWN_MODE) 97 return 1; 98 99 mdelay(1); 100 } 101 102 return 0; 103 } 104 105 static void sh73a0_cpu_die(unsigned int cpu) 106 { 107 /* Set power off mode. This takes the CPU out of the MP cluster */ 108 scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF); 109 110 /* Enter shutdown mode */ 111 cpu_do_idle(); 112 } 113 114 static int sh73a0_cpu_disable(unsigned int cpu) 115 { 116 return 0; /* CPU0 and CPU1 supported */ 117 } 118 #endif /* CONFIG_HOTPLUG_CPU */ 119 120 struct smp_operations sh73a0_smp_ops __initdata = { 121 .smp_init_cpus = sh73a0_smp_init_cpus, 122 .smp_prepare_cpus = sh73a0_smp_prepare_cpus, 123 .smp_boot_secondary = sh73a0_boot_secondary, 124 #ifdef CONFIG_HOTPLUG_CPU 125 .cpu_kill = sh73a0_cpu_kill, 126 .cpu_die = sh73a0_cpu_die, 127 .cpu_disable = sh73a0_cpu_disable, 128 #endif 129 }; 130