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/r8a7779.h> 28 #include <asm/cacheflush.h> 29 #include <asm/smp_plat.h> 30 #include <asm/smp_scu.h> 31 #include <asm/smp_twd.h> 32 33 #define AVECR IOMEM(0xfe700040) 34 #define R8A7779_SCU_BASE 0xf0000000 35 36 static struct r8a7779_pm_ch r8a7779_ch_cpu1 = { 37 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 38 .chan_bit = 1, /* ARM1 */ 39 .isr_bit = 1, /* ARM1 */ 40 }; 41 42 static struct r8a7779_pm_ch r8a7779_ch_cpu2 = { 43 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 44 .chan_bit = 2, /* ARM2 */ 45 .isr_bit = 2, /* ARM2 */ 46 }; 47 48 static struct r8a7779_pm_ch r8a7779_ch_cpu3 = { 49 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 50 .chan_bit = 3, /* ARM3 */ 51 .isr_bit = 3, /* ARM3 */ 52 }; 53 54 static struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = { 55 [1] = &r8a7779_ch_cpu1, 56 [2] = &r8a7779_ch_cpu2, 57 [3] = &r8a7779_ch_cpu3, 58 }; 59 60 #ifdef CONFIG_HAVE_ARM_TWD 61 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29); 62 void __init r8a7779_register_twd(void) 63 { 64 twd_local_timer_register(&twd_local_timer); 65 } 66 #endif 67 68 static int r8a7779_platform_cpu_kill(unsigned int cpu) 69 { 70 struct r8a7779_pm_ch *ch = NULL; 71 int ret = -EIO; 72 73 cpu = cpu_logical_map(cpu); 74 75 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) 76 ch = r8a7779_ch_cpu[cpu]; 77 78 if (ch) 79 ret = r8a7779_sysc_power_down(ch); 80 81 return ret ? ret : 1; 82 } 83 84 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) 85 { 86 struct r8a7779_pm_ch *ch = NULL; 87 unsigned int lcpu = cpu_logical_map(cpu); 88 int ret; 89 90 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu)) 91 ch = r8a7779_ch_cpu[lcpu]; 92 93 if (ch) 94 ret = r8a7779_sysc_power_up(ch); 95 else 96 ret = -EIO; 97 98 return ret; 99 } 100 101 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) 102 { 103 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ 104 __raw_writel(__pa(shmobile_boot_vector), AVECR); 105 shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); 106 shmobile_boot_arg = (unsigned long)shmobile_scu_base; 107 108 /* setup r8a7779 specific SCU bits */ 109 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); 110 shmobile_smp_scu_prepare_cpus(max_cpus); 111 112 r8a7779_pm_init(); 113 114 /* power off secondary CPUs */ 115 r8a7779_platform_cpu_kill(1); 116 r8a7779_platform_cpu_kill(2); 117 r8a7779_platform_cpu_kill(3); 118 } 119 120 #ifdef CONFIG_HOTPLUG_CPU 121 static int r8a7779_cpu_kill(unsigned int cpu) 122 { 123 if (shmobile_smp_scu_cpu_kill(cpu)) 124 return r8a7779_platform_cpu_kill(cpu); 125 126 return 0; 127 } 128 129 static int r8a7779_cpu_disable(unsigned int cpu) 130 { 131 /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */ 132 return cpu == 0 ? -EPERM : 0; 133 } 134 #endif /* CONFIG_HOTPLUG_CPU */ 135 136 struct smp_operations r8a7779_smp_ops __initdata = { 137 .smp_prepare_cpus = r8a7779_smp_prepare_cpus, 138 .smp_boot_secondary = r8a7779_boot_secondary, 139 #ifdef CONFIG_HOTPLUG_CPU 140 .cpu_disable = r8a7779_cpu_disable, 141 .cpu_die = shmobile_smp_scu_cpu_die, 142 .cpu_kill = r8a7779_cpu_kill, 143 #endif 144 }; 145