diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-shmobile/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mach-shmobile/include/mach/common.h | 5 | ||||
| -rw-r--r-- | arch/arm/mach-shmobile/platsmp.c | 14 | ||||
| -rw-r--r-- | arch/arm/mach-shmobile/smp-sh73a0.c | 97 |
4 files changed, 116 insertions, 1 deletions
diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile index d4346ddd9121..995f39bde909 100644 --- a/arch/arm/mach-shmobile/Makefile +++ b/arch/arm/mach-shmobile/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_ARCH_SH73A0) += setup-sh73a0.o clock-sh73a0.o smp-y := platsmp.o headsmp.o smp-$(CONFIG_HOTPLUG_CPU) += hotplug.o smp-$(CONFIG_LOCAL_TIMERS) += localtimer.o +smp-$(CONFIG_ARCH_SH73A0) += smp-sh73a0.o # Pinmux setup pfc-y := diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h index 32822f7556ea..b8f1f62bce97 100644 --- a/arch/arm/mach-shmobile/include/mach/common.h +++ b/arch/arm/mach-shmobile/include/mach/common.h @@ -38,4 +38,9 @@ extern void sh73a0_pinmux_init(void); extern struct clk sh73a0_extal1_clk; extern struct clk sh73a0_extal2_clk; +extern unsigned int sh73a0_get_core_count(void); +extern void sh73a0_secondary_init(unsigned int cpu); +extern int sh73a0_boot_secondary(unsigned int cpu); +extern void sh73a0_smp_prepare_cpus(void); + #endif /* __ARCH_MACH_COMMON_H */ diff --git a/arch/arm/mach-shmobile/platsmp.c b/arch/arm/mach-shmobile/platsmp.c index b41f5d0650e4..3c2c0f49073e 100644 --- a/arch/arm/mach-shmobile/platsmp.c +++ b/arch/arm/mach-shmobile/platsmp.c @@ -16,25 +16,37 @@ #include <linux/smp.h> #include <linux/io.h> #include <asm/localtimer.h> +#include <asm/mach-types.h> +#include <mach/common.h> static unsigned int __init shmobile_smp_get_core_count(void) { + if (machine_is_ag5evm()) + return sh73a0_get_core_count(); + return 1; } static void __init shmobile_smp_prepare_cpus(void) { - /* do nothing for now */ + if (machine_is_ag5evm()) + sh73a0_smp_prepare_cpus(); } void __cpuinit platform_secondary_init(unsigned int cpu) { trace_hardirqs_off(); + + if (machine_is_ag5evm()) + sh73a0_secondary_init(cpu); } int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) { + if (machine_is_ag5evm()) + return sh73a0_boot_secondary(cpu); + return -ENOSYS; } diff --git a/arch/arm/mach-shmobile/smp-sh73a0.c b/arch/arm/mach-shmobile/smp-sh73a0.c new file mode 100644 index 000000000000..4e71fd416cd5 --- /dev/null +++ b/arch/arm/mach-shmobile/smp-sh73a0.c @@ -0,0 +1,97 @@ +/* + * SMP support for R-Mobile / SH-Mobile - sh73a0 portion + * + * Copyright (C) 2010 Magnus Damm + * Copyright (C) 2010 Takashi Yoshii + * + * 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 <mach/common.h> +#include <asm/smp_scu.h> +#include <asm/smp_twd.h> +#include <asm/hardware/gic.h> + +#define WUPCR 0xe6151010 +#define SRESCR 0xe6151018 +#define PSTR 0xe6151040 +#define SBAR 0xe6180020 +#define APARMBAREA 0xe6f10020 + +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 sh73a0_get_core_count(void) +{ + void __iomem *scu_base = scu_base_addr(); + + return scu_get_core_count(scu_base); +} + +void __cpuinit sh73a0_secondary_init(unsigned int cpu) +{ + gic_cpu_init(0, __io(0xf0000100)); +} + +int __cpuinit sh73a0_boot_secondary(unsigned int cpu) +{ + /* enable cache coherency */ + modify_scu_cpu_psr(0, 3 << (cpu * 8)); + + if (((__raw_readw(__io(PSTR)) >> (4 * cpu)) & 3) == 3) + __raw_writel(1 << cpu, __io(WUPCR)); /* wake up */ + else + __raw_writel(1 << cpu, __io(SRESCR)); /* reset */ + + return 0; +} + +void __init sh73a0_smp_prepare_cpus(void) +{ +#ifdef CONFIG_HAVE_ARM_TWD + twd_base = (void __iomem *)0xf0000600; +#endif + + scu_enable(scu_base_addr()); + + /* Map the reset vector (in headsmp.S) */ + __raw_writel(0, __io(APARMBAREA)); /* 4k */ + __raw_writel(__pa(shmobile_secondary_vector), __io(SBAR)); + + /* enable cache coherency on CPU0 */ + modify_scu_cpu_psr(0, 3 << (0 * 8)); +} |