diff options
Diffstat (limited to 'arch/arm/mach-shmobile/smp-r8a7779.c')
| -rw-r--r-- | arch/arm/mach-shmobile/smp-r8a7779.c | 153 |
1 files changed, 153 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 00000000000..cc97ef892d1 --- /dev/null +++ b/arch/arm/mach-shmobile/smp-r8a7779.c @@ -0,0 +1,153 @@ +/* + * 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/smp_scu.h> +#include <asm/smp_twd.h> +#include <asm/hardware/gic.h> + +#define AVECR 0xfe700040 + +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, +}; + +static void __iomem *scu_base_addr(void) +{ + return (void __iomem *)0xf0000000; +} + +static DEFINE_SPINLOCK(scu_lock); +static unsigned long tmp; + +static void modify_scu_cpu_psr(unsigned long set, unsigned long clr) +{ + void __iomem *scu_base = scu_base_addr(); + + spin_lock(&scu_lock); + tmp = __raw_readl(scu_base + 8); + tmp &= ~clr; + tmp |= set; + spin_unlock(&scu_lock); + + /* disable cache coherency after releasing the lock */ + __raw_writel(tmp, scu_base + 8); +} + +unsigned int __init r8a7779_get_core_count(void) +{ + void __iomem *scu_base = scu_base_addr(); + +#ifdef CONFIG_HAVE_ARM_TWD + /* twd_base needs to be initialized before percpu_timer_setup() */ + twd_base = (void __iomem *)0xf0000600; +#endif + + return scu_get_core_count(scu_base); +} + +int r8a7779_platform_cpu_kill(unsigned int cpu) +{ + struct r8a7779_pm_ch *ch = NULL; + int ret = -EIO; + + cpu = cpu_logical_map(cpu); + + /* disable cache coherency */ + modify_scu_cpu_psr(3 << (cpu * 8), 0); + + if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) + ch = r8a7779_ch_cpu[cpu]; + + if (ch) + ret = r8a7779_sysc_power_down(ch); + + return ret ? ret : 1; +} + +void __cpuinit r8a7779_secondary_init(unsigned int cpu) +{ + gic_secondary_init(0); +} + +int __cpuinit r8a7779_boot_secondary(unsigned int cpu) +{ + struct r8a7779_pm_ch *ch = NULL; + int ret = -EIO; + + cpu = cpu_logical_map(cpu); + + /* enable cache coherency */ + modify_scu_cpu_psr(0, 3 << (cpu * 8)); + + if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) + ch = r8a7779_ch_cpu[cpu]; + + if (ch) + ret = r8a7779_sysc_power_up(ch); + + return ret; +} + +void __init r8a7779_smp_prepare_cpus(void) +{ + int cpu = cpu_logical_map(0); + + scu_enable(scu_base_addr()); + + /* Map the reset vector (in headsmp.S) */ + __raw_writel(__pa(shmobile_secondary_vector), __io(AVECR)); + + /* enable cache coherency on CPU0 */ + modify_scu_cpu_psr(0, 3 << (cpu * 8)); + + r8a7779_pm_init(); + + /* power off secondary CPUs */ + r8a7779_platform_cpu_kill(1); + r8a7779_platform_cpu_kill(2); + r8a7779_platform_cpu_kill(3); +} |