smp-r8a7779.c revision fd0865c3f7054d9068007fd280681cb4ea7929a1
1f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm/* 2f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * SMP support for R-Mobile / SH-Mobile - r8a7779 portion 3f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * 4f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * Copyright (C) 2011 Renesas Solutions Corp. 5f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * Copyright (C) 2011 Magnus Damm 6f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * 7f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * This program is free software; you can redistribute it and/or modify 8f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * it under the terms of the GNU General Public License as published by 9f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * the Free Software Foundation; version 2 of the License. 10f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * 11f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * This program is distributed in the hope that it will be useful, 12f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * but WITHOUT ANY WARRANTY; without even the implied warranty of 13f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * GNU General Public License for more details. 15f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * 16f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * You should have received a copy of the GNU General Public License 17f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * along with this program; if not, write to the Free Software 18f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm */ 20f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <linux/kernel.h> 21f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <linux/init.h> 22f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <linux/smp.h> 23f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <linux/spinlock.h> 24f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <linux/io.h> 25f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <linux/delay.h> 26520f7bd73354f003a9a59937b28e4903d985c420Rob Herring#include <linux/irqchip/arm-gic.h> 27f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <mach/common.h> 28f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <mach/r8a7779.h> 29bbf2627c77355ee07cb589904efaf814cfc223d1Magnus Damm#include <asm/cacheflush.h> 30eb50439b92b6298bf209a982f295ba9c0f7cb30bWill Deacon#include <asm/smp_plat.h> 31f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <asm/smp_scu.h> 32f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm#include <asm/smp_twd.h> 33f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 34a2a47ca36642e3995e982957bc42678cf11ca6acRob Herring#define AVECR IOMEM(0xfe700040) 35abf88136f73da52162d7e70bd1d8d4294c08bf1eMagnus Damm#define R8A7779_SCU_BASE 0xf0000000 363b94afa38350ad5b592df5b6539a20a253e04b53Magnus Damm 37f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Dammstatic struct r8a7779_pm_ch r8a7779_ch_cpu1 = { 38f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 39f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .chan_bit = 1, /* ARM1 */ 40f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .isr_bit = 1, /* ARM1 */ 41f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm}; 42f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 43f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Dammstatic struct r8a7779_pm_ch r8a7779_ch_cpu2 = { 44f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 45f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .chan_bit = 2, /* ARM2 */ 46f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .isr_bit = 2, /* ARM2 */ 47f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm}; 48f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 49f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Dammstatic struct r8a7779_pm_ch r8a7779_ch_cpu3 = { 50f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ 51f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .chan_bit = 3, /* ARM3 */ 52f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm .isr_bit = 3, /* ARM3 */ 53f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm}; 54f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 55f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Dammstatic struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = { 56f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm [1] = &r8a7779_ch_cpu1, 57f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm [2] = &r8a7779_ch_cpu2, 58f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm [3] = &r8a7779_ch_cpu3, 59f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm}; 60f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 61b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Damm#ifdef CONFIG_HAVE_ARM_TWD 62abf88136f73da52162d7e70bd1d8d4294c08bf1eMagnus Dammstatic DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29); 63b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Dammvoid __init r8a7779_register_twd(void) 64b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Damm{ 65b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Damm twd_local_timer_register(&twd_local_timer); 66b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Damm} 67b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Damm#endif 68b759bd114e27fbb940fb44fd16552e8f4acd831eMagnus Damm 69a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngierstatic int r8a7779_platform_cpu_kill(unsigned int cpu) 70f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm{ 71f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm struct r8a7779_pm_ch *ch = NULL; 72f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm int ret = -EIO; 73f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 74f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm cpu = cpu_logical_map(cpu); 75f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 76f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) 77f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm ch = r8a7779_ch_cpu[cpu]; 78f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 79f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm if (ch) 80f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm ret = r8a7779_sysc_power_down(ch); 81f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 82f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm return ret ? ret : 1; 83f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm} 84f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 85a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngierstatic void __cpuinit r8a7779_secondary_init(unsigned int cpu) 86f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm{ 87f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm gic_secondary_init(0); 88f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm} 89f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 90a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngierstatic int __cpuinit r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) 91f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm{ 92f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm struct r8a7779_pm_ch *ch = NULL; 93f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm int ret = -EIO; 94f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 95f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm cpu = cpu_logical_map(cpu); 96f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 97f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) 98f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm ch = r8a7779_ch_cpu[cpu]; 99f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 100f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm if (ch) 101f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm ret = r8a7779_sysc_power_up(ch); 102f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 103f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm return ret; 104f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm} 105f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 106a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngierstatic void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) 107f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm{ 1083b94afa38350ad5b592df5b6539a20a253e04b53Magnus Damm scu_enable(shmobile_scu_base); 109f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 1108bbcd729d219ca7cdc06ad3b0dea161c4c41b807Magnus Damm /* Map the reset vector (in headsmp-scu.S) */ 1118bbcd729d219ca7cdc06ad3b0dea161c4c41b807Magnus Damm __raw_writel(__pa(shmobile_secondary_vector_scu), AVECR); 112f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 1138bbcd729d219ca7cdc06ad3b0dea161c4c41b807Magnus Damm /* enable cache coherency on booting CPU */ 1148bbcd729d219ca7cdc06ad3b0dea161c4c41b807Magnus Damm scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); 115f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 116f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm r8a7779_pm_init(); 117f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm 118f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm /* power off secondary CPUs */ 119f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm r8a7779_platform_cpu_kill(1); 120f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm r8a7779_platform_cpu_kill(2); 121f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm r8a7779_platform_cpu_kill(3); 122f40aaf6da14a4043d6361e0c7d74ada18e866059Magnus Damm} 123a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier 124a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngierstatic void __init r8a7779_smp_init_cpus(void) 125a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier{ 1263b94afa38350ad5b592df5b6539a20a253e04b53Magnus Damm /* setup r8a7779 specific SCU base */ 127abf88136f73da52162d7e70bd1d8d4294c08bf1eMagnus Damm shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); 128a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier 1293b94afa38350ad5b592df5b6539a20a253e04b53Magnus Damm shmobile_smp_init_cpus(scu_get_core_count(shmobile_scu_base)); 130a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier} 131a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier 132fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm#ifdef CONFIG_HOTPLUG_CPU 133fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Dammstatic int r8a7779_scu_psr_core_disabled(int cpu) 134fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm{ 135fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm unsigned long mask = 3 << (cpu * 8); 136fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 137fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm if ((__raw_readl(shmobile_scu_base + 8) & mask) == mask) 138fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm return 1; 139fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 140fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm return 0; 141fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm} 142fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 143fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Dammstatic int r8a7779_cpu_kill(unsigned int cpu) 144fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm{ 145fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm int k; 146fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 147fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm /* this function is running on another CPU than the offline target, 148fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm * here we need wait for shutdown code in platform_cpu_die() to 149fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm * finish before asking SoC-specific code to power off the CPU core. 150fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm */ 151fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm for (k = 0; k < 1000; k++) { 152fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm if (r8a7779_scu_psr_core_disabled(cpu)) 153fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm return r8a7779_platform_cpu_kill(cpu); 154fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 155fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm mdelay(1); 156fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm } 157fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 158fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm return 0; 159fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm} 160fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 161fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Dammstatic void r8a7779_cpu_die(unsigned int cpu) 162fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm{ 163fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm dsb(); 164fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm flush_cache_all(); 165fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 166fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm /* disable cache coherency */ 167fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF); 168fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 169fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm /* Endless loop until power off from r8a7779_cpu_kill() */ 170fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm while (1) 171fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm cpu_do_idle(); 172fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm} 173fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 174fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Dammstatic int r8a7779_cpu_disable(unsigned int cpu) 175fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm{ 176fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */ 177fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm return cpu == 0 ? -EPERM : 0; 178fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm} 179fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm#endif /* CONFIG_HOTPLUG_CPU */ 180fd0865c3f7054d9068007fd280681cb4ea7929a1Magnus Damm 181a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngierstruct smp_operations r8a7779_smp_ops __initdata = { 182a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier .smp_init_cpus = r8a7779_smp_init_cpus, 183a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier .smp_prepare_cpus = r8a7779_smp_prepare_cpus, 184a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier .smp_secondary_init = r8a7779_secondary_init, 185a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier .smp_boot_secondary = r8a7779_boot_secondary, 186a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier#ifdef CONFIG_HOTPLUG_CPU 187a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier .cpu_kill = r8a7779_cpu_kill, 188bbf2627c77355ee07cb589904efaf814cfc223d1Magnus Damm .cpu_die = r8a7779_cpu_die, 189bbf2627c77355ee07cb589904efaf814cfc223d1Magnus Damm .cpu_disable = r8a7779_cpu_disable, 190a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier#endif 191a62580e58065dc00430b16ced6e7a00837b8323fMarc Zyngier}; 192