diff options
Diffstat (limited to 'kernel/arch/arm/mach-shmobile/smp-r8a7779.c')
| -rw-r--r-- | kernel/arch/arm/mach-shmobile/smp-r8a7779.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-shmobile/smp-r8a7779.c b/kernel/arch/arm/mach-shmobile/smp-r8a7779.c new file mode 100644 index 000000000..01f792fcb --- /dev/null +++ b/kernel/arch/arm/mach-shmobile/smp-r8a7779.c @@ -0,0 +1,136 @@ +/* + * SMP support for R-Mobile / SH-Mobile - r8a7779 portion + * + * Copyright (C) 2011 Renesas Solutions Corp. + * Copyright (C) 2011 Magnus Damm + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/spinlock.h> +#include <linux/io.h> +#include <linux/delay.h> + +#include <asm/cacheflush.h> +#include <asm/smp_plat.h> +#include <asm/smp_scu.h> +#include <asm/smp_twd.h> + +#include "common.h" +#include "pm-rcar.h" +#include "r8a7779.h" + +#define AVECR IOMEM(0xfe700040) +#define R8A7779_SCU_BASE 0xf0000000 + +static struct rcar_sysc_ch r8a7779_ch_cpu1 = { + .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ + .chan_bit = 1, /* ARM1 */ + .isr_bit = 1, /* ARM1 */ +}; + +static struct rcar_sysc_ch r8a7779_ch_cpu2 = { + .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ + .chan_bit = 2, /* ARM2 */ + .isr_bit = 2, /* ARM2 */ +}; + +static struct rcar_sysc_ch r8a7779_ch_cpu3 = { + .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ + .chan_bit = 3, /* ARM3 */ + .isr_bit = 3, /* ARM3 */ +}; + +static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = { + [1] = &r8a7779_ch_cpu1, + [2] = &r8a7779_ch_cpu2, + [3] = &r8a7779_ch_cpu3, +}; + +#if defined(CONFIG_HAVE_ARM_TWD) && !defined(CONFIG_ARCH_MULTIPLATFORM) +static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29); +void __init r8a7779_register_twd(void) +{ + twd_local_timer_register(&twd_local_timer); +} +#endif + +static int r8a7779_platform_cpu_kill(unsigned int cpu) +{ + struct rcar_sysc_ch *ch = NULL; + int ret = -EIO; + + cpu = cpu_logical_map(cpu); + + if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) + ch = r8a7779_ch_cpu[cpu]; + + if (ch) + ret = rcar_sysc_power_down(ch); + + return ret ? ret : 1; +} + +static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + struct rcar_sysc_ch *ch = NULL; + unsigned int lcpu = cpu_logical_map(cpu); + int ret; + + if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu)) + ch = r8a7779_ch_cpu[lcpu]; + + if (ch) + ret = rcar_sysc_power_up(ch); + else + ret = -EIO; + + return ret; +} + +static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) +{ + /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ + __raw_writel(__pa(shmobile_boot_vector), AVECR); + shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); + shmobile_boot_arg = (unsigned long)shmobile_scu_base; + + /* setup r8a7779 specific SCU bits */ + shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); + shmobile_smp_scu_prepare_cpus(max_cpus); + + r8a7779_pm_init(); + + /* power off secondary CPUs */ + r8a7779_platform_cpu_kill(1); + r8a7779_platform_cpu_kill(2); + r8a7779_platform_cpu_kill(3); +} + +#ifdef CONFIG_HOTPLUG_CPU +static int r8a7779_cpu_kill(unsigned int cpu) +{ + if (shmobile_smp_scu_cpu_kill(cpu)) + return r8a7779_platform_cpu_kill(cpu); + + return 0; +} +#endif /* CONFIG_HOTPLUG_CPU */ + +struct smp_operations r8a7779_smp_ops __initdata = { + .smp_prepare_cpus = r8a7779_smp_prepare_cpus, + .smp_boot_secondary = r8a7779_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = shmobile_smp_scu_cpu_die, + .cpu_kill = r8a7779_cpu_kill, +#endif +}; |