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 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/smp.h> 19 #include <linux/spinlock.h> 20 #include <linux/io.h> 21 #include <linux/delay.h> 22 23 #include <asm/cacheflush.h> 24 #include <asm/smp_plat.h> 25 #include <asm/smp_scu.h> 26 27 #include "common.h" 28 #include "pm-rcar.h" 29 #include "r8a7779.h" 30 31 #define AVECR IOMEM(0xfe700040) 32 #define R8A7779_SCU_BASE 0xf0000000 33 34 static const struct rcar_sysc_ch r8a7779_ch_cpu1 = { 35 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 36 .chan_bit = 1, /* ARM1 */ 37 .isr_bit = 1, /* ARM1 */ 38 }; 39 40 static const struct rcar_sysc_ch r8a7779_ch_cpu2 = { 41 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 42 .chan_bit = 2, /* ARM2 */ 43 .isr_bit = 2, /* ARM2 */ 44 }; 45 46 static const struct rcar_sysc_ch r8a7779_ch_cpu3 = { 47 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 48 .chan_bit = 3, /* ARM3 */ 49 .isr_bit = 3, /* ARM3 */ 50 }; 51 52 static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = { 53 [1] = &r8a7779_ch_cpu1, 54 [2] = &r8a7779_ch_cpu2, 55 [3] = &r8a7779_ch_cpu3, 56 }; 57 58 static int r8a7779_platform_cpu_kill(unsigned int cpu) 59 { 60 const struct rcar_sysc_ch *ch = NULL; 61 int ret = -EIO; 62 63 cpu = cpu_logical_map(cpu); 64 65 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) 66 ch = r8a7779_ch_cpu[cpu]; 67 68 if (ch) 69 ret = rcar_sysc_power_down(ch); 70 71 return ret ? ret : 1; 72 } 73 74 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) 75 { 76 const struct rcar_sysc_ch *ch = NULL; 77 unsigned int lcpu = cpu_logical_map(cpu); 78 int ret; 79 80 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu)) 81 ch = r8a7779_ch_cpu[lcpu]; 82 83 if (ch) 84 ret = rcar_sysc_power_up(ch); 85 else 86 ret = -EIO; 87 88 return ret; 89 } 90 91 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) 92 { 93 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ 94 __raw_writel(__pa(shmobile_boot_vector), AVECR); 95 shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); 96 shmobile_boot_arg = (unsigned long)shmobile_scu_base; 97 98 /* setup r8a7779 specific SCU bits */ 99 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); 100 shmobile_smp_scu_prepare_cpus(max_cpus); 101 102 r8a7779_pm_init(); 103 104 /* power off secondary CPUs */ 105 r8a7779_platform_cpu_kill(1); 106 r8a7779_platform_cpu_kill(2); 107 r8a7779_platform_cpu_kill(3); 108 } 109 110 #ifdef CONFIG_HOTPLUG_CPU 111 static int r8a7779_cpu_kill(unsigned int cpu) 112 { 113 if (shmobile_smp_scu_cpu_kill(cpu)) 114 return r8a7779_platform_cpu_kill(cpu); 115 116 return 0; 117 } 118 #endif /* CONFIG_HOTPLUG_CPU */ 119 120 const struct smp_operations r8a7779_smp_ops __initconst = { 121 .smp_prepare_cpus = r8a7779_smp_prepare_cpus, 122 .smp_boot_secondary = r8a7779_boot_secondary, 123 #ifdef CONFIG_HOTPLUG_CPU 124 .cpu_die = shmobile_smp_scu_cpu_die, 125 .cpu_kill = r8a7779_cpu_kill, 126 #endif 127 }; 128