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 #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 #include <asm/smp_plat.h> 23 #include <asm/smp_scu.h> 24 #include "common.h" 25 26 #define EMEV2_SCU_BASE 0x1e000000 27 #define EMEV2_SMU_BASE 0xe0110000 28 #define SMU_GENERAL_REG0 0x7c0 29 30 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) 31 { 32 arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); 33 return 0; 34 } 35 36 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) 37 { 38 void __iomem *smu; 39 40 /* Tell ROM loader about our vector (in headsmp.S) */ 41 smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); 42 if (smu) { 43 iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); 44 iounmap(smu); 45 } 46 47 /* setup EMEV2 specific SCU bits */ 48 shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); 49 shmobile_smp_scu_prepare_cpus(max_cpus); 50 } 51 52 struct smp_operations emev2_smp_ops __initdata = { 53 .smp_prepare_cpus = emev2_smp_prepare_cpus, 54 .smp_boot_secondary = emev2_boot_secondary, 55 }; 56