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 #define EMEV2_SMU_BASE 0xe0110000 33 #define SMU_GENERAL_REG0 0x7c0 34 35 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) 36 { 37 int ret; 38 39 ret = shmobile_smp_scu_boot_secondary(cpu, idle); 40 if (ret) 41 return ret; 42 43 arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); 44 return 0; 45 } 46 47 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) 48 { 49 void __iomem *smu; 50 51 /* Tell ROM loader about our vector (in headsmp.S) */ 52 smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); 53 if (smu) { 54 iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); 55 iounmap(smu); 56 } 57 58 /* setup EMEV2 specific SCU bits */ 59 shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); 60 shmobile_smp_scu_prepare_cpus(max_cpus); 61 } 62 63 struct smp_operations emev2_smp_ops __initdata = { 64 .smp_prepare_cpus = emev2_smp_prepare_cpus, 65 .smp_boot_secondary = emev2_boot_secondary, 66 }; 67