| 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 | #ifdef CONFIG_HAVE_ARM_TWD |
| 37 | static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29); |
| 38 | void __init sh73a0_register_twd(void) |
| 39 | { |
| 40 | twd_local_timer_register(&twd_local_timer); |
| 41 | } |
| 42 | #endif |
| 43 | |
| 44 | static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 45 | { |
| 46 | unsigned int lcpu = cpu_logical_map(cpu); |
| 47 | |
| 48 | if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3) |
| 49 | __raw_writel(1 << lcpu, WUPCR); /* wake up */ |
| 50 | else |
| 51 | __raw_writel(1 << lcpu, SRESCR); /* reset */ |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) |
| 57 | { |
| 58 | /* Map the reset vector (in headsmp.S) */ |
| 59 | __raw_writel(0, APARMBAREA); /* 4k */ |
| 60 | __raw_writel(__pa(shmobile_boot_vector), SBAR); |
| 61 | |
| 62 | /* setup sh73a0 specific SCU bits */ |
| 63 | shmobile_scu_base = IOMEM(SH73A0_SCU_BASE); |
| 64 | shmobile_smp_scu_prepare_cpus(max_cpus); |
| 65 | } |
| 66 | |
| 67 | struct smp_operations sh73a0_smp_ops __initdata = { |
| 68 | .smp_prepare_cpus = sh73a0_smp_prepare_cpus, |
| 69 | .smp_boot_secondary = sh73a0_boot_secondary, |
| 70 | #ifdef CONFIG_HOTPLUG_CPU |
| 71 | .cpu_disable = shmobile_smp_cpu_disable, |
| 72 | .cpu_die = shmobile_smp_scu_cpu_die, |
| 73 | .cpu_kill = shmobile_smp_scu_cpu_kill, |
| 74 | #endif |
| 75 | }; |