1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * SMP support for Emma Mobile EV2 4 * 5 * Copyright (C) 2012 Renesas Solutions Corp. 6 * Copyright (C) 2012 Magnus Damm 7 */ 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/smp.h> 11 #include <linux/spinlock.h> 12 #include <linux/io.h> 13 #include <linux/delay.h> 14 #include <asm/smp_plat.h> 15 #include <asm/smp_scu.h> 16 17 #include "common.h" 18 #include "emev2.h" 19 20 #define EMEV2_SCU_BASE 0x1e000000 21 #define EMEV2_SMU_BASE 0xe0110000 22 #define SMU_GENERAL_REG0 0x7c0 23 24 static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) 25 { 26 arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); 27 return 0; 28 } 29 30 static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) 31 { 32 void __iomem *smu; 33 34 /* Tell ROM loader about our vector (in headsmp.S) */ 35 smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); 36 if (smu) { 37 iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); 38 iounmap(smu); 39 } 40 41 /* setup EMEV2 specific SCU bits */ 42 shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus); 43 } 44 45 const struct smp_operations emev2_smp_ops __initconst = { 46 .smp_prepare_cpus = emev2_smp_prepare_cpus, 47 .smp_boot_secondary = emev2_boot_secondary, 48 }; 49