| Tsahee Zidenberg | e9e06f2 | 2015-03-12 13:53:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * SMP operations for Alpine platform. |
| 3 | * |
| 4 | * Copyright (C) 2015 Annapurna Labs Ltd. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 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 | |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/of.h> |
| 21 | |
| 22 | #include <asm/smp_plat.h> |
| 23 | |
| 24 | #include "alpine_cpu_pm.h" |
| 25 | |
| 26 | static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 27 | { |
| 28 | phys_addr_t addr; |
| 29 | |
| 30 | addr = virt_to_phys(secondary_startup); |
| 31 | |
| 32 | if (addr > (phys_addr_t)(uint32_t)(-1)) { |
| 33 | pr_err("FAIL: resume address over 32bit (%pa)", &addr); |
| 34 | return -EINVAL; |
| 35 | } |
| 36 | |
| 37 | return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr); |
| 38 | } |
| 39 | |
| 40 | static void __init alpine_smp_prepare_cpus(unsigned int max_cpus) |
| 41 | { |
| 42 | alpine_cpu_pm_init(); |
| 43 | } |
| 44 | |
| 45 | static struct smp_operations alpine_smp_ops __initdata = { |
| 46 | .smp_prepare_cpus = alpine_smp_prepare_cpus, |
| 47 | .smp_boot_secondary = alpine_boot_secondary, |
| 48 | }; |
| 49 | CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops); |