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 25 #include "common.h" 26 #include "emev2.h" 27 28 #define EMEV2_SCU_BASE 0x1e000000 29 #define EMEV2_SMU_BASE 0xe0110000 30 #define SMU_GENERAL_REG0 0x7c0 31 32 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) 33 { 34 arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); 35 return 0; 36 } 37 38 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) 39 { 40 void __iomem *smu; 41 42 /* Tell ROM loader about our vector (in headsmp.S) */ 43 smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); 44 if (smu) { 45 iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); 46 iounmap(smu); 47 } 48 49 /* setup EMEV2 specific SCU bits */ 50 shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus); 51 } 52 53 const struct smp_operations emev2_smp_ops __initconst = { 54 .smp_prepare_cpus = emev2_smp_prepare_cpus, 55 .smp_boot_secondary = emev2_boot_secondary, 56 }; 57