1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SMP operations for Alpine platform. 4 * 5 * Copyright (C) 2015 Annapurna Labs Ltd. 6 */ 7 8 #include <linux/init.h> 9 #include <linux/errno.h> 10 #include <linux/io.h> 11 #include <linux/of.h> 12 13 #include <asm/smp_plat.h> 14 15 #include "alpine_cpu_pm.h" 16 17 static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle) 18 { 19 phys_addr_t addr; 20 21 addr = __pa_symbol(secondary_startup); 22 23 if (addr > (phys_addr_t)(uint32_t)(-1)) { 24 pr_err("FAIL: resume address over 32bit (%pa)", &addr); 25 return -EINVAL; 26 } 27 28 return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr); 29 } 30 31 static void __init alpine_smp_prepare_cpus(unsigned int max_cpus) 32 { 33 alpine_cpu_pm_init(); 34 } 35 36 static const struct smp_operations alpine_smp_ops __initconst = { 37 .smp_prepare_cpus = alpine_smp_prepare_cpus, 38 .smp_boot_secondary = alpine_boot_secondary, 39 }; 40 CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops); 41