diff options
author | Zhangfei Gao <zhangfei.gao@linaro.org> | 2013-08-02 16:52:40 +0800 |
---|---|---|
committer | Haojian Zhuang <haojian.zhuang@linaro.org> | 2013-08-28 15:56:20 +0800 |
commit | 92d84ba11543638390a2c18cbb7966aaf02e3187 (patch) | |
tree | 5f6f9f5339cd4226edf0edd898cf974173194b16 | |
parent | 9631cb17db5d4e75ba4fd33f2e595b9469f99bed (diff) |
ARM: hi3xxx: add hotplug supporttesting/hi3xxx-v8
Enable hotplug support on hi3xxx platform
How to test:
cat proc/interrupts
echo 0 > /sys/devices/system/cpu/cpuX/online
cat proc/interrupts
echo 1 > /sys/devices/system/cpu/cpuX/online
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Zhang Mingjun <zhang.mingjun@linaro.org>
-rw-r--r-- | arch/arm/mach-hi3xxx/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/mach-hi3xxx/core.h | 5 | ||||
-rw-r--r-- | arch/arm/mach-hi3xxx/hi3xxx.c | 1 | ||||
-rw-r--r-- | arch/arm/mach-hi3xxx/hotplug.c | 154 | ||||
-rw-r--r-- | arch/arm/mach-hi3xxx/platsmp.c | 5 |
5 files changed, 166 insertions, 0 deletions
diff --git a/arch/arm/mach-hi3xxx/Makefile b/arch/arm/mach-hi3xxx/Makefile index 0917f1c250b9..c597cbf7e3c3 100644 --- a/arch/arm/mach-hi3xxx/Makefile +++ b/arch/arm/mach-hi3xxx/Makefile @@ -4,3 +4,4 @@ obj-y += hi3xxx.o system.o obj-$(CONFIG_SMP) += platsmp.o +obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o diff --git a/arch/arm/mach-hi3xxx/core.h b/arch/arm/mach-hi3xxx/core.h index 2cfd643449f4..c2ce35dcfbd2 100644 --- a/arch/arm/mach-hi3xxx/core.h +++ b/arch/arm/mach-hi3xxx/core.h @@ -11,4 +11,9 @@ extern void hs_map_io(void); extern void hs_restart(enum reboot_mode, const char *cmd); extern struct smp_operations hs_smp_ops; +extern void __init hs_hotplug_init(void); +extern void hs_cpu_die(unsigned int cpu); +extern int hs_cpu_kill(unsigned int cpu); +extern void hs_set_cpu(int cpu, bool enable); + #endif diff --git a/arch/arm/mach-hi3xxx/hi3xxx.c b/arch/arm/mach-hi3xxx/hi3xxx.c index 567a0d5b5564..01ac68b31269 100644 --- a/arch/arm/mach-hi3xxx/hi3xxx.c +++ b/arch/arm/mach-hi3xxx/hi3xxx.c @@ -24,6 +24,7 @@ static void __init hi3xxx_timer_init(void) { hs_map_io(); + hs_hotplug_init(); of_clk_init(NULL); clocksource_of_init(); } diff --git a/arch/arm/mach-hi3xxx/hotplug.c b/arch/arm/mach-hi3xxx/hotplug.c new file mode 100644 index 000000000000..c67f8a22a890 --- /dev/null +++ b/arch/arm/mach-hi3xxx/hotplug.c @@ -0,0 +1,154 @@ +/* + * Copyright (c) 2013 Linaro Ltd. + * Copyright (c) 2013 Hisilicon Limited. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ +#include <linux/cpu.h> +#include <linux/io.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <asm/cacheflush.h> +#include <asm/smp_plat.h> +#include "core.h" + +enum { + HI3620_CTRL, + HI3716_CTRL, +}; + +static void __iomem *ctrl_base; +static int id; + +void hs_set_cpu(int cpu, bool enable) +{ + u32 val = 0; + + if (!ctrl_base) + return; + + if (id == HI3620_CTRL) { + if (enable) { + /* MTCMOS */ + writel_relaxed((0x01 << (cpu + 3)), ctrl_base + 0xD0); + writel_relaxed((0x1011 << cpu), ctrl_base + 0x414); + writel_relaxed((0x401011 << cpu), ctrl_base + 0x410); + + /* ISO disable */ + writel((0x01 << (cpu + 3)), ctrl_base + 0x0C4); + + /* WFI Mask */ + val = readl(ctrl_base + 0x200); + val &= ~(0x1 << (cpu+28)); + writel(val, ctrl_base + 0x200); + + /* Enable core */ + writel_relaxed((0x01 << cpu), ctrl_base + 0xf4); + /* Unreset */ + writel_relaxed((0x401011 << cpu), ctrl_base + 0x414); + } else { + /* iso enable */ + writel_relaxed((0x01 << (cpu + 3)), ctrl_base + 0xC0); + + /* MTCMOS */ + writel_relaxed((0x01 << (cpu + 3)), ctrl_base + 0xD4); + + /* wfi mask */ + val = readl_relaxed(ctrl_base + 0x200); + val |= (0x1 << (cpu+28)); + writel_relaxed(val, ctrl_base + 0x200); + + /* disable core*/ + writel_relaxed((0x01 << cpu), ctrl_base + 0xf8); + /* Reset */ + writel_relaxed((0x401011 << cpu), ctrl_base + 0x410); + } + } else if (id == HI3716_CTRL) { + if (enable) { + /* power on cpu1 */ + val = readl_relaxed(ctrl_base + 0x1000); + val &= ~(0x1 << 8); + val |= (0x1 << 7); + val &= ~(0x1 << 3); + writel_relaxed(val, ctrl_base + 0x1000); + + /* unreset */ + val = readl_relaxed(ctrl_base + 0x50); + val &= ~(0x1 << 17); + writel_relaxed(val, ctrl_base + 0x50); + } else { + /* power down cpu1 */ + val = readl_relaxed(ctrl_base + 0x1000); + val &= ~(0x1 << 8); + val |= (0x1 << 7); + val |= (0x1 << 3); + writel_relaxed(val, ctrl_base + 0x1000); + + /* reset */ + val = readl_relaxed(ctrl_base + 0x50); + val |= (0x1 << 17); + writel_relaxed(val, ctrl_base + 0x50); + } + } +} + +void __init hs_hotplug_init(void) +{ + struct device_node *node; + + node = of_find_compatible_node(NULL, NULL, "hisilicon,cpuctrl"); + if (node) { + ctrl_base = of_iomap(node, 0); + id = HI3716_CTRL; + return; + } + node = of_find_compatible_node(NULL, NULL, "hisilicon,sctrl"); + if (node) { + ctrl_base = of_iomap(node, 0); + id = HI3620_CTRL; + return; + } +} + +static inline void cpu_enter_lowpower(void) +{ + unsigned int v; + + flush_cache_all(); + asm volatile( + /* + * Turn off coherency and L1 D-cache + */ + " mrc p15, 0, %0, c1, c0, 1\n" + " bic %0, %0, #0x40\n" + " mcr p15, 0, %0, c1, c0, 1\n" + " mrc p15, 0, %0, c1, c0, 0\n" + " bic %0, %0, #0x04\n" + " mcr p15, 0, %0, c1, c0, 0\n" + : "=&r" (v) + : "r" (0) + : "cc"); +} + +void hs_cpu_die(unsigned int cpu) +{ + cpu_enter_lowpower(); + hs_set_cpu_jump(cpu, phys_to_virt(0)); + cpu_do_idle(); + + /* We should have never returned from idle */ + panic("cpu %d unexpectedly exit from shutdown\n", cpu); +} + +int hs_cpu_kill(unsigned int cpu) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(50); + + while (hs_get_cpu_jump(cpu)) + if (time_after(jiffies, timeout)) + return 0; + hs_set_cpu(cpu, false); + return 1; +} diff --git a/arch/arm/mach-hi3xxx/platsmp.c b/arch/arm/mach-hi3xxx/platsmp.c index a76a3cca22e7..6a086307abbf 100644 --- a/arch/arm/mach-hi3xxx/platsmp.c +++ b/arch/arm/mach-hi3xxx/platsmp.c @@ -32,6 +32,7 @@ static void __init hs_smp_prepare_cpus(unsigned int max_cpus) static int hs_boot_secondary(unsigned int cpu, struct task_struct *idle) { + hs_set_cpu(cpu, true); hs_set_cpu_jump(cpu, secondary_startup); arch_send_wakeup_ipi_mask(cpumask_of(cpu)); return 0; @@ -40,4 +41,8 @@ static int hs_boot_secondary(unsigned int cpu, struct task_struct *idle) struct smp_operations hs_smp_ops __initdata = { .smp_prepare_cpus = hs_smp_prepare_cpus, .smp_boot_secondary = hs_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = hs_cpu_die, + .cpu_kill = hs_cpu_kill, +#endif }; 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