/* * SMP support for Emma Mobile EV2 * * Copyright (C) 2012 Renesas Solutions Corp. * Copyright (C) 2012 Magnus Damm * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/smp.h> #include <linux/spinlock.h> #include <linux/io.h> #include <linux/delay.h> #include <mach/common.h> #include <mach/emev2.h> #include <asm/smp_plat.h> #include <asm/smp_scu.h> #define EMEV2_SCU_BASE 0x1e000000 static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) { arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); return 0; } static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) { scu_enable(shmobile_scu_base); /* Tell ROM loader about our vector (in headsmp-scu.S) */ emev2_set_boot_vector(__pa(shmobile_secondary_vector_scu)); /* enable cache coherency on booting CPU */ scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); } static void __init emev2_smp_init_cpus(void) { unsigned int ncores; /* setup EMEV2 specific SCU base */ shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); emev2_clock_init(); /* need ioremapped SMU */ ncores = shmobile_scu_base ? scu_get_core_count(shmobile_scu_base) : 1; shmobile_smp_init_cpus(ncores); } struct smp_operations emev2_smp_ops __initdata = { .smp_init_cpus = emev2_smp_init_cpus, .smp_prepare_cpus = emev2_smp_prepare_cpus, .smp_boot_secondary = emev2_boot_secondary, };