1 /* 2 * SMP support for Emma Mobile EV2 3 * 4 * Copyright (C) 2012 Renesas Solutions Corp. 5 * Copyright (C) 2012 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/emev2.h> 28 #include <asm/smp_plat.h> 29 #include <asm/smp_scu.h> 30 31 #define EMEV2_SCU_BASE 0x1e000000 32 33 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) 34 { 35 arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); 36 return 0; 37 } 38 39 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) 40 { 41 scu_enable(shmobile_scu_base); 42 43 /* Tell ROM loader about our vector (in headsmp-scu.S, headsmp.S) */ 44 emev2_set_boot_vector(__pa(shmobile_boot_vector)); 45 shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); 46 shmobile_boot_arg = (unsigned long)shmobile_scu_base; 47 48 /* enable cache coherency on booting CPU */ 49 scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); 50 } 51 52 static void __init emev2_smp_init_cpus(void) 53 { 54 unsigned int ncores; 55 56 /* setup EMEV2 specific SCU base */ 57 shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); 58 emev2_clock_init(); /* need ioremapped SMU */ 59 60 ncores = shmobile_scu_base ? scu_get_core_count(shmobile_scu_base) : 1; 61 62 shmobile_smp_init_cpus(ncores); 63 } 64 65 struct smp_operations emev2_smp_ops __initdata = { 66 .smp_init_cpus = emev2_smp_init_cpus, 67 .smp_prepare_cpus = emev2_smp_prepare_cpus, 68 .smp_boot_secondary = emev2_boot_secondary, 69 }; 70