1 /* 2 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion 3 * 4 * Copyright (C) 2011 Renesas Solutions Corp. 5 * Copyright (C) 2011 Magnus Damm 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 27 #include <asm/cacheflush.h> 28 #include <asm/smp_plat.h> 29 #include <asm/smp_scu.h> 30 #include <asm/smp_twd.h> 31 32 #include "common.h" 33 #include "pm-rcar.h" 34 #include "r8a7779.h" 35 36 #define AVECR IOMEM(0xfe700040) 37 #define R8A7779_SCU_BASE 0xf0000000 38 39 static struct rcar_sysc_ch r8a7779_ch_cpu1 = { 40 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 41 .chan_bit = 1, /* ARM1 */ 42 .isr_bit = 1, /* ARM1 */ 43 }; 44 45 static struct rcar_sysc_ch r8a7779_ch_cpu2 = { 46 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 47 .chan_bit = 2, /* ARM2 */ 48 .isr_bit = 2, /* ARM2 */ 49 }; 50 51 static struct rcar_sysc_ch r8a7779_ch_cpu3 = { 52 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 53 .chan_bit = 3, /* ARM3 */ 54 .isr_bit = 3, /* ARM3 */ 55 }; 56 57 static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = { 58 [1] = &r8a7779_ch_cpu1, 59 [2] = &r8a7779_ch_cpu2, 60 [3] = &r8a7779_ch_cpu3, 61 }; 62 63 #ifdef CONFIG_HAVE_ARM_TWD 64 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29); 65 void __init r8a7779_register_twd(void) 66 { 67 twd_local_timer_register(&twd_local_timer); 68 } 69 #endif 70 71 static int r8a7779_platform_cpu_kill(unsigned int cpu) 72 { 73 struct rcar_sysc_ch *ch = NULL; 74 int ret = -EIO; 75 76 cpu = cpu_logical_map(cpu); 77 78 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) 79 ch = r8a7779_ch_cpu[cpu]; 80 81 if (ch) 82 ret = rcar_sysc_power_down(ch); 83 84 return ret ? ret : 1; 85 } 86 87 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) 88 { 89 struct rcar_sysc_ch *ch = NULL; 90 unsigned int lcpu = cpu_logical_map(cpu); 91 int ret; 92 93 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu)) 94 ch = r8a7779_ch_cpu[lcpu]; 95 96 if (ch) 97 ret = rcar_sysc_power_up(ch); 98 else 99 ret = -EIO; 100 101 return ret; 102 } 103 104 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) 105 { 106 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ 107 __raw_writel(__pa(shmobile_boot_vector), AVECR); 108 shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); 109 shmobile_boot_arg = (unsigned long)shmobile_scu_base; 110 111 /* setup r8a7779 specific SCU bits */ 112 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); 113 shmobile_smp_scu_prepare_cpus(max_cpus); 114 115 r8a7779_pm_init(); 116 117 /* power off secondary CPUs */ 118 r8a7779_platform_cpu_kill(1); 119 r8a7779_platform_cpu_kill(2); 120 r8a7779_platform_cpu_kill(3); 121 } 122 123 #ifdef CONFIG_HOTPLUG_CPU 124 static int r8a7779_cpu_kill(unsigned int cpu) 125 { 126 if (shmobile_smp_scu_cpu_kill(cpu)) 127 return r8a7779_platform_cpu_kill(cpu); 128 129 return 0; 130 } 131 132 static int r8a7779_cpu_disable(unsigned int cpu) 133 { 134 /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */ 135 return cpu == 0 ? -EPERM : 0; 136 } 137 #endif /* CONFIG_HOTPLUG_CPU */ 138 139 struct smp_operations r8a7779_smp_ops __initdata = { 140 .smp_prepare_cpus = r8a7779_smp_prepare_cpus, 141 .smp_boot_secondary = r8a7779_boot_secondary, 142 #ifdef CONFIG_HOTPLUG_CPU 143 .cpu_disable = r8a7779_cpu_disable, 144 .cpu_die = shmobile_smp_scu_cpu_die, 145 .cpu_kill = r8a7779_cpu_kill, 146 #endif 147 }; 148