| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * SMP support for R-Mobile / SH-Mobile - sh73a0 portion |
| 4 | * |
| 5 | * Copyright (C) 2010 Magnus Damm |
| 6 | * Copyright (C) 2010 Takashi Yoshii |
| 7 | */ |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/smp.h> |
| 11 | #include <linux/io.h> |
| 12 | #include <linux/delay.h> |
| 13 | |
| 14 | #include <asm/smp_plat.h> |
| 15 | |
| 16 | #include "common.h" |
| 17 | #include "sh73a0.h" |
| 18 | |
| 19 | #define WUPCR IOMEM(0xe6151010) |
| 20 | #define SRESCR IOMEM(0xe6151018) |
| 21 | #define PSTR IOMEM(0xe6151040) |
| 22 | #define SBAR IOMEM(0xe6180020) |
| 23 | #define APARMBAREA IOMEM(0xe6f10020) |
| 24 | |
| 25 | #define SH73A0_SCU_BASE 0xf0000000 |
| 26 | |
| 27 | static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 28 | { |
| 29 | unsigned int lcpu = cpu_logical_map(cpu); |
| 30 | |
| 31 | if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) |
| 32 | __raw_writel(1 << lcpu, WUPCR); /* wake up */ |
| 33 | else |
| 34 | __raw_writel(1 << lcpu, SRESCR); /* reset */ |
| 35 | |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) |
| 40 | { |
| 41 | /* Map the reset vector (in headsmp.S) */ |
| 42 | __raw_writel(0, APARMBAREA); /* 4k */ |
| 43 | __raw_writel(__pa(shmobile_boot_vector), SBAR); |
| 44 | |
| 45 | /* setup sh73a0 specific SCU bits */ |
| 46 | shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); |
| 47 | } |
| 48 | |
| 49 | const struct smp_operations sh73a0_smp_ops __initconst = { |
| 50 | .smp_prepare_cpus = sh73a0_smp_prepare_cpus, |
| 51 | .smp_boot_secondary = sh73a0_boot_secondary, |
| 52 | #ifdef CONFIG_HOTPLUG_CPU |
| 53 | .cpu_can_disable = shmobile_smp_cpu_can_disable, |
| 54 | .cpu_die = shmobile_smp_scu_cpu_die, |
| 55 | .cpu_kill = shmobile_smp_scu_cpu_kill, |
| 56 | #endif |
| 57 | }; |