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