diff options
Diffstat (limited to 'arch/arm/mach-shmobile/smp-r8a7779.c')
| -rw-r--r-- | arch/arm/mach-shmobile/smp-r8a7779.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c new file mode 100644 index 00000000..a853bf18 --- /dev/null +++ b/arch/arm/mach-shmobile/smp-r8a7779.c @@ -0,0 +1,184 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#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 <mach/common.h> +#include <mach/r8a7779.h> +#include <asm/cacheflush.h> +#include <asm/smp_plat.h> +#include <asm/smp_scu.h> +#include <asm/smp_twd.h> + +#define AVECR IOMEM(0xfe700040) +#define R8A7779_SCU_BASE 0xf0000000 + +static struct r8a7779_pm_ch r8a7779_ch_cpu1 = { + .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ + .chan_bit = 1, /* ARM1 */ + .isr_bit = 1, /* ARM1 */ +}; + +static struct r8a7779_pm_ch r8a7779_ch_cpu2 = { + .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ + .chan_bit = 2, /* ARM2 */ + .isr_bit = 2, /* ARM2 */ +}; + +static struct r8a7779_pm_ch r8a7779_ch_cpu3 = { + .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ + .chan_bit = 3, /* ARM3 */ + .isr_bit = 3, /* ARM3 */ +}; + +static struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = { + [1] = &r8a7779_ch_cpu1, + [2] = &r8a7779_ch_cpu2, + [3] = &r8a7779_ch_cpu3, +}; + +#ifdef CONFIG_HAVE_ARM_TWD +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 r8a7779_pm_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 = r8a7779_sysc_power_down(ch); + + return ret ? ret : 1; +} + +static int __cpuinit r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + struct r8a7779_pm_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 = r8a7779_sysc_power_up(ch); + + return ret; +} + +static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) +{ + scu_enable(shmobile_scu_base); + + /* Map the reset vector (in headsmp-scu.S) */ + __raw_writel(__pa(shmobile_secondary_vector_scu), AVECR); + + /* enable cache coherency on booting CPU */ + scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); + + r8a7779_pm_init(); + + /* power off secondary CPUs */ + r8a7779_platform_cpu_kill(1); + r8a7779_platform_cpu_kill(2); + r8a7779_platform_cpu_kill(3); +} + +static void __init r8a7779_smp_init_cpus(void) +{ + /* setup r8a7779 specific SCU base */ + shmobile_scu_base = IOMEM(R8A7779_SCU_BASE); + + shmobile_smp_init_cpus(scu_get_core_count(shmobile_scu_base)); +} + +#ifdef CONFIG_HOTPLUG_CPU +static int r8a7779_scu_psr_core_disabled(int cpu) +{ + unsigned long mask = 3 << (cpu * 8); + + if ((__raw_readl(shmobile_scu_base + 8) & mask) == mask) + return 1; + + return 0; +} + +static int r8a7779_cpu_kill(unsigned int cpu) +{ + int k; + + /* this function is running on another CPU than the offline target, + * here we need wait for shutdown code in platform_cpu_die() to + * finish before asking SoC-specific code to power off the CPU core. + */ + for (k = 0; k < 1000; k++) { + if (r8a7779_scu_psr_core_disabled(cpu)) + return r8a7779_platform_cpu_kill(cpu); + + mdelay(1); + } + + return 0; +} + +static void r8a7779_cpu_die(unsigned int cpu) +{ + dsb(); + flush_cache_all(); + + /* disable cache coherency */ + scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF); + + /* Endless loop until power off from r8a7779_cpu_kill() */ + while (1) + cpu_do_idle(); +} + +static int r8a7779_cpu_disable(unsigned int cpu) +{ + /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */ + return cpu == 0 ? -EPERM : 0; +} +#endif /* CONFIG_HOTPLUG_CPU */ + +struct smp_operations r8a7779_smp_ops __initdata = { + .smp_init_cpus = r8a7779_smp_init_cpus, + .smp_prepare_cpus = r8a7779_smp_prepare_cpus, + .smp_boot_secondary = r8a7779_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_kill = r8a7779_cpu_kill, + .cpu_die = r8a7779_cpu_die, + .cpu_disable = r8a7779_cpu_disable, +#endif +}; |