| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * SMP support for R-Mobile / SH-Mobile - r8a7779 portion |
| 4 | * |
| 5 | * Copyright (C) 2011 Renesas Solutions Corp. |
| 6 | * Copyright (C) 2011 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 <linux/soc/renesas/rcar-sysc.h> |
| 15 | |
| 16 | #include <asm/cacheflush.h> |
| 17 | #include <asm/smp_plat.h> |
| 18 | #include <asm/smp_scu.h> |
| 19 | |
| 20 | #include "common.h" |
| 21 | #include "r8a7779.h" |
| 22 | |
| 23 | #define AVECR IOMEM(0xfe700040) |
| 24 | #define R8A7779_SCU_BASE 0xf0000000 |
| 25 | |
| 26 | static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 27 | { |
| 28 | int ret = -EIO; |
| 29 | |
| 30 | cpu = cpu_logical_map(cpu); |
| 31 | if (cpu) |
| 32 | ret = rcar_sysc_power_up_cpu(cpu); |
| 33 | |
| 34 | return ret; |
| 35 | } |
| 36 | |
| 37 | static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) |
| 38 | { |
| 39 | /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ |
| 40 | __raw_writel(__pa(shmobile_boot_vector), AVECR); |
| 41 | |
| 42 | /* setup r8a7779 specific SCU bits */ |
| 43 | shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus); |
| 44 | } |
| 45 | |
| 46 | #ifdef CONFIG_HOTPLUG_CPU |
| 47 | static int r8a7779_platform_cpu_kill(unsigned int cpu) |
| 48 | { |
| 49 | int ret = -EIO; |
| 50 | |
| 51 | cpu = cpu_logical_map(cpu); |
| 52 | if (cpu) |
| 53 | ret = rcar_sysc_power_down_cpu(cpu); |
| 54 | |
| 55 | return ret ? ret : 1; |
| 56 | } |
| 57 | |
| 58 | static int r8a7779_cpu_kill(unsigned int cpu) |
| 59 | { |
| 60 | if (shmobile_smp_scu_cpu_kill(cpu)) |
| 61 | return r8a7779_platform_cpu_kill(cpu); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 66 | |
| 67 | const struct smp_operations r8a7779_smp_ops __initconst = { |
| 68 | .smp_prepare_cpus = r8a7779_smp_prepare_cpus, |
| 69 | .smp_boot_secondary = r8a7779_boot_secondary, |
| 70 | #ifdef CONFIG_HOTPLUG_CPU |
| 71 | .cpu_die = shmobile_smp_scu_cpu_die, |
| 72 | .cpu_kill = r8a7779_cpu_kill, |
| 73 | #endif |
| 74 | }; |