| | 1 | /* |
| | 2 | * SMP support for R-Mobile / SH-Mobile - sh73a0 portion |
| | 3 | * |
| | 4 | * Copyright (C) 2010 Magnus Damm |
| | 5 | * Copyright (C) 2010 Takashi Yoshii |
| | 6 | * |
| | 7 | * This program is free software; you can redistribute it and/or modify |
| | 8 | * it under the terms of the GNU General Public License as published by |
| | 9 | * the Free Software Foundation; version 2 of the License. |
| | 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 | #include <linux/kernel.h> |
| | 17 | #include <linux/init.h> |
| | 18 | #include <linux/smp.h> |
| | 19 | #include <linux/io.h> |
| | 20 | #include <linux/delay.h> |
| | 21 | |
| | 22 | #include <asm/smp_plat.h> |
| | 23 | #include <asm/smp_twd.h> |
| | 24 | |
| | 25 | #include "common.h" |
| | 26 | #include "sh73a0.h" |
| | 27 | |
| | 28 | #define WUPCR IOMEM(0xe6151010) |
| | 29 | #define SRESCR IOMEM(0xe6151018) |
| | 30 | #define PSTR IOMEM(0xe6151040) |
| | 31 | #define SBAR IOMEM(0xe6180020) |
| | 32 | #define APARMBAREA IOMEM(0xe6f10020) |
| | 33 | |
| | 34 | #define SH73A0_SCU_BASE 0xf0000000 |
| | 35 | |
| | 36 | static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| | 37 | { |
| | 38 | unsigned int lcpu = cpu_logical_map(cpu); |
| | 39 | |
| | 40 | if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) |
| | 41 | __raw_writel(1 << lcpu, WUPCR); /* wake up */ |
| | 42 | else |
| | 43 | __raw_writel(1 << lcpu, SRESCR); /* reset */ |
| | 44 | |
| | 45 | return 0; |
| | 46 | } |
| | 47 | |
| | 48 | static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) |
| | 49 | { |
| | 50 | /* Map the reset vector (in headsmp.S) */ |
| | 51 | __raw_writel(0, APARMBAREA); /* 4k */ |
| | 52 | __raw_writel(__pa(shmobile_boot_vector), SBAR); |
| | 53 | |
| | 54 | /* setup sh73a0 specific SCU bits */ |
| | 55 | shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus); |
| | 56 | } |
| | 57 | |
| | 58 | const struct smp_operations sh73a0_smp_ops __initconst = { |
| | 59 | .smp_prepare_cpus = sh73a0_smp_prepare_cpus, |
| | 60 | .smp_boot_secondary = sh73a0_boot_secondary, |
| | 61 | #ifdef CONFIG_HOTPLUG_CPU |
| | 62 | .cpu_can_disable = shmobile_smp_cpu_can_disable, |
| | 63 | .cpu_die = shmobile_smp_scu_cpu_die, |
| | 64 | .cpu_kill = shmobile_smp_scu_cpu_kill, |
| | 65 | #endif |
| | 66 | }; |
projects / mirror_ubuntu-artful-kernel.git / blame_incremental