From 1c51ed4fb9f11fa1e0873aa2d5b28f42a85ac299 Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Tue, 14 Dec 2010 16:56:55 +0900 Subject: ARM: mach-shmobile: SMP base support Add SMP base support for R-Mobile / SH-Mobile processors. This patch contains all base code to support CONFIG_SMP regardless of ARCH_SHMOBILE processor type. Both local timer and CPU hotplug are supported, but no processor specific code is included. At this point only the default behavior is in place, so a single core will always be used even though CONFIG_SMP is enabled on multicore systems. The SMP Kconfig entry for arch/arm/Kconfig is excluded from this patch to simplify merging. Signed-off-by: Magnus Damm Signed-off-by: Paul Mundt --- arch/arm/mach-shmobile/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/arm/mach-shmobile/Makefile') diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile index f5ad0892984d..d4346ddd9121 100644 --- a/arch/arm/mach-shmobile/Makefile +++ b/arch/arm/mach-shmobile/Makefile @@ -11,6 +11,11 @@ obj-$(CONFIG_ARCH_SH7377) += setup-sh7377.o clock-sh7377.o intc-sh7377.o obj-$(CONFIG_ARCH_SH7372) += setup-sh7372.o clock-sh7372.o intc-sh7372.o obj-$(CONFIG_ARCH_SH73A0) += setup-sh73a0.o clock-sh73a0.o +# SMP objects +smp-y := platsmp.o headsmp.o +smp-$(CONFIG_HOTPLUG_CPU) += hotplug.o +smp-$(CONFIG_LOCAL_TIMERS) += localtimer.o + # Pinmux setup pfc-y := pfc-$(CONFIG_ARCH_SH7367) += pfc-sh7367.o @@ -26,4 +31,5 @@ obj-$(CONFIG_MACH_AG5EVM) += board-ag5evm.o obj-$(CONFIG_MACH_MACKEREL) += board-mackerel.o # Framework support +obj-$(CONFIG_SMP) += $(smp-y) obj-$(CONFIG_GENERIC_GPIO) += $(pfc-y) -- cgit v1.2.3-55-g7522 From 72f4d57923d2aa651db060a71a6f6211654c119e Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Tue, 14 Dec 2010 16:57:11 +0900 Subject: ARM: mach-shmobile: sh73a0 SMP support Add SMP support for ag5evm and the sh73a0 processor. Onlining and offlining works well, but at this point offlined processor cores are not put into sleep mode. There is no spinlock for syncing the secondary core with the first one in this implementation. The code instead relies on the cpu_online() check in __cpu_up(). Signed-off-by: Magnus Damm Signed-off-by: Paul Mundt --- arch/arm/mach-shmobile/Makefile | 1 + arch/arm/mach-shmobile/include/mach/common.h | 5 ++ arch/arm/mach-shmobile/platsmp.c | 14 +++- arch/arm/mach-shmobile/smp-sh73a0.c | 97 ++++++++++++++++++++++++++++ 4 files changed, 116 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-shmobile/smp-sh73a0.c (limited to 'arch/arm/mach-shmobile/Makefile') diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile index d4346ddd9121..995f39bde909 100644 --- a/arch/arm/mach-shmobile/Makefile +++ b/arch/arm/mach-shmobile/Makefile @@ -15,6 +15,7 @@ obj-$(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 #include #include +#include +#include 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#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)); +} -- cgit v1.2.3-55-g7522