| 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 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/smp.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <mach/common.h> |
| 27 | #include <asm/cacheflush.h> |
| 28 | #include <asm/smp_plat.h> |
| 29 | #include <mach/sh73a0.h> |
| 30 | #include <asm/smp_scu.h> |
| 31 | #include <asm/smp_twd.h> |
| 32 | |
| 33 | #define WUPCR IOMEM(0xe6151010) |
| 34 | #define SRESCR IOMEM(0xe6151018) |
| 35 | #define PSTR IOMEM(0xe6151040) |
| 36 | #define SBAR IOMEM(0xe6180020) |
| 37 | #define APARMBAREA IOMEM(0xe6f10020) |
| 38 | |
| 39 | #define PSTR_SHUTDOWN_MODE 3 |
| 40 | |
| 41 | #define SH73A0_SCU_BASE 0xf0000000 |
| 42 | |
| 43 | #ifdef CONFIG_HAVE_ARM_TWD |
| 44 | static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29); |
| 45 | void __init sh73a0_register_twd(void) |
| 46 | { |
| 47 | twd_local_timer_register(&twd_local_timer); |
| 48 | } |
| 49 | #endif |
| 50 | |
| 51 | static int __cpuinit sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 52 | { |
| 53 | cpu = cpu_logical_map(cpu); |
| 54 | |
| 55 | if (((__raw_readl(PSTR) >> (4 * cpu)) & 3) == 3) |
| 56 | __raw_writel(1 << cpu, WUPCR); /* wake up */ |
| 57 | else |
| 58 | __raw_writel(1 << cpu, SRESCR); /* reset */ |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) |
| 64 | { |
| 65 | scu_enable(shmobile_scu_base); |
| 66 | |
| 67 | /* Map the reset vector (in headsmp-scu.S) */ |
| 68 | __raw_writel(0, APARMBAREA); /* 4k */ |
| 69 | __raw_writel(__pa(shmobile_secondary_vector_scu), SBAR); |
| 70 | |
| 71 | /* enable cache coherency on booting CPU */ |
| 72 | scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); |
| 73 | } |
| 74 | |
| 75 | static void __init sh73a0_smp_init_cpus(void) |
| 76 | { |
| 77 | /* setup sh73a0 specific SCU base */ |
| 78 | shmobile_scu_base = IOMEM(SH73A0_SCU_BASE); |
| 79 | |
| 80 | shmobile_smp_init_cpus(scu_get_core_count(shmobile_scu_base)); |
| 81 | } |
| 82 | |
| 83 | #ifdef CONFIG_HOTPLUG_CPU |
| 84 | static int sh73a0_cpu_kill(unsigned int cpu) |
| 85 | { |
| 86 | |
| 87 | int k; |
| 88 | u32 pstr; |
| 89 | |
| 90 | /* |
| 91 | * wait until the power status register confirms the shutdown of the |
| 92 | * offline target |
| 93 | */ |
| 94 | for (k = 0; k < 1000; k++) { |
| 95 | pstr = (__raw_readl(PSTR) >> (4 * cpu)) & 3; |
| 96 | if (pstr == PSTR_SHUTDOWN_MODE) |
| 97 | return 1; |
| 98 | |
| 99 | mdelay(1); |
| 100 | } |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static void sh73a0_cpu_die(unsigned int cpu) |
| 106 | { |
| 107 | /* Set power off mode. This takes the CPU out of the MP cluster */ |
| 108 | scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF); |
| 109 | |
| 110 | /* Enter shutdown mode */ |
| 111 | cpu_do_idle(); |
| 112 | } |
| 113 | |
| 114 | static int sh73a0_cpu_disable(unsigned int cpu) |
| 115 | { |
| 116 | return 0; /* CPU0 and CPU1 supported */ |
| 117 | } |
| 118 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 119 | |
| 120 | struct smp_operations sh73a0_smp_ops __initdata = { |
| 121 | .smp_init_cpus = sh73a0_smp_init_cpus, |
| 122 | .smp_prepare_cpus = sh73a0_smp_prepare_cpus, |
| 123 | .smp_boot_secondary = sh73a0_boot_secondary, |
| 124 | #ifdef CONFIG_HOTPLUG_CPU |
| 125 | .cpu_kill = sh73a0_cpu_kill, |
| 126 | .cpu_die = sh73a0_cpu_die, |
| 127 | .cpu_disable = sh73a0_cpu_disable, |
| 128 | #endif |
| 129 | }; |