[PATCH v12 06/08] ARM: hi3xxx: add hotplug support
Haojian Zhuang
haojian.zhuang at linaro.org
Wed Dec 11 02:54:55 EST 2013
From: Zhangfei Gao <zhangfei.gao at linaro.org>
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 at linaro.org>
Tested-by: Zhang Mingjun <zhang.mingjun at linaro.org>
Signed-off-by: Haojian Zhuang <haojian.zhuang at linaro.org>
---
arch/arm/mach-hi3xxx/Makefile | 1 +
arch/arm/mach-hi3xxx/core.h | 4 +
arch/arm/mach-hi3xxx/hotplug.c | 200 +++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-hi3xxx/platsmp.c | 5 ++
4 files changed, 210 insertions(+)
create mode 100644 arch/arm/mach-hi3xxx/hotplug.c
diff --git a/arch/arm/mach-hi3xxx/Makefile b/arch/arm/mach-hi3xxx/Makefile
index 7a869a7..c9919e8 100644
--- a/arch/arm/mach-hi3xxx/Makefile
+++ b/arch/arm/mach-hi3xxx/Makefile
@@ -4,3 +4,4 @@
obj-y += hi3xxx.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 226f020..af23ec2 100644
--- a/arch/arm/mach-hi3xxx/core.h
+++ b/arch/arm/mach-hi3xxx/core.h
@@ -8,4 +8,8 @@ extern int hi3xxx_get_cpu_jump(int cpu);
extern void secondary_startup(void);
extern struct smp_operations hi3xxx_smp_ops;
+extern void hi3xxx_cpu_die(unsigned int cpu);
+extern int hi3xxx_cpu_kill(unsigned int cpu);
+extern void hi3xxx_set_cpu(int cpu, bool enable);
+
#endif
diff --git a/arch/arm/mach-hi3xxx/hotplug.c b/arch/arm/mach-hi3xxx/hotplug.c
new file mode 100644
index 0000000..5dc949e
--- /dev/null
+++ b/arch/arm/mach-hi3xxx/hotplug.c
@@ -0,0 +1,200 @@
+/*
+ * 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/delay.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"
+
+/* Sysctrl registers in Hi3620 SoC */
+#define SCISOEN 0xc0
+#define SCISODIS 0xc4
+#define SCPERPWREN 0xd0
+#define SCPERPWRDIS 0xd4
+#define SCCPUCOREEN 0xf4
+#define SCCPUCOREDIS 0xf8
+#define SCPERCTRL0 0x200
+#define SCCPURSTEN 0x410
+#define SCCPURSTDIS 0x414
+
+/*
+ * bit definition in SCISOEN/SCPERPWREN/...
+ *
+ * CPU2_ISO_CTRL (1 << 5)
+ * CPU3_ISO_CTRL (1 << 6)
+ * ...
+ */
+#define CPU2_ISO_CTRL (1 << 5)
+
+/*
+ * bit definition in SCPERCTRL0
+ *
+ * CPU0_WFI_MASK_CFG (1 << 28)
+ * CPU1_WFI_MASK_CFG (1 << 29)
+ * ...
+ */
+#define CPU0_WFI_MASK_CFG (1 << 28)
+
+/*
+ * bit definition in SCCPURSTEN/...
+ *
+ * CPU0_SRST_REQ_EN (1 << 0)
+ * CPU1_SRST_REQ_EN (1 << 1)
+ * ...
+ */
+#define CPU0_HPM_SRST_REQ_EN (1 << 22)
+#define CPU0_DBG_SRST_REQ_EN (1 << 12)
+#define CPU0_NEON_SRST_REQ_EN (1 << 4)
+#define CPU0_SRST_REQ_EN (1 << 0)
+
+enum {
+ HI3620_CTRL,
+ ERROR_CTRL,
+};
+
+static void __iomem *ctrl_base = NULL;
+static int id;
+
+static void set_cpu_hi3620(int cpu, bool enable)
+{
+ u32 val = 0;
+
+ if (enable) {
+ /* MTCMOS set */
+ if ((cpu == 2) || (cpu == 3))
+ writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
+ ctrl_base + SCPERPWREN);
+ udelay(100);
+
+ /* Enable core */
+ writel_relaxed(0x01 << cpu, ctrl_base + SCCPUCOREEN);
+
+ /* unreset */
+ val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
+ | CPU0_SRST_REQ_EN;
+ writel_relaxed(val << cpu, ctrl_base + SCCPURSTDIS);
+ /* reset */
+ val |= CPU0_HPM_SRST_REQ_EN;
+ writel_relaxed(val << cpu, ctrl_base + SCCPURSTEN);
+
+ /* ISO disable */
+ if ((cpu == 2) || (cpu == 3))
+ writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
+ ctrl_base + SCISODIS);
+ udelay(1);
+
+ /* WFI Mask */
+ val = readl_relaxed(ctrl_base + SCPERCTRL0);
+ val &= ~(CPU0_WFI_MASK_CFG << cpu);
+ writel_relaxed(val, ctrl_base + SCPERCTRL0);
+
+ /* Unreset */
+ val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
+ | CPU0_SRST_REQ_EN | CPU0_HPM_SRST_REQ_EN;
+ writel_relaxed(val << cpu, ctrl_base + SCCPURSTDIS);
+ } else {
+ /* wfi mask */
+ val = readl_relaxed(ctrl_base + SCPERCTRL0);
+ val |= (CPU0_WFI_MASK_CFG << cpu);
+ writel_relaxed(val, ctrl_base + SCPERCTRL0);
+
+ /* disable core*/
+ writel_relaxed(0x01 << cpu, ctrl_base + SCCPUCOREDIS);
+
+ if ((cpu == 2) || (cpu == 3)) {
+ /* iso enable */
+ writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
+ ctrl_base + SCISOEN);
+ udelay(1);
+ }
+
+ /* reset */
+ val = CPU0_DBG_SRST_REQ_EN | CPU0_NEON_SRST_REQ_EN
+ | CPU0_SRST_REQ_EN | CPU0_HPM_SRST_REQ_EN;
+ writel_relaxed(val << cpu, ctrl_base + SCCPURSTEN);
+
+ if ((cpu == 2) || (cpu == 3)) {
+ /* MTCMOS unset */
+ writel_relaxed(CPU2_ISO_CTRL << (cpu - 2),
+ ctrl_base + SCPERPWRDIS);
+ udelay(100);
+ }
+ }
+}
+
+static int hi3xxx_hotplug_init(void)
+{
+ struct device_node *node;
+
+ node = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
+ if (node) {
+ ctrl_base = of_iomap(node, 0);
+ id = HI3620_CTRL;
+ return 0;
+ }
+ id = ERROR_CTRL;
+ return -ENOENT;
+}
+
+void hi3xxx_set_cpu(int cpu, bool enable)
+{
+ if (!ctrl_base) {
+ if (hi3xxx_hotplug_init() < 0)
+ return;
+ }
+
+ if (id == HI3620_CTRL)
+ set_cpu_hi3620(cpu, enable);
+}
+
+static inline void cpu_enter_lowpower(void)
+{
+ unsigned int v;
+
+ flush_cache_all();
+
+ /*
+ * Turn off coherency and L1 D-cache
+ */
+ asm volatile(
+ " 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 hi3xxx_cpu_die(unsigned int cpu)
+{
+ cpu_enter_lowpower();
+ hi3xxx_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 hi3xxx_cpu_kill(unsigned int cpu)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(50);
+
+ while (hi3xxx_get_cpu_jump(cpu))
+ if (time_after(jiffies, timeout))
+ return 0;
+ hi3xxx_set_cpu(cpu, false);
+ return 1;
+}
diff --git a/arch/arm/mach-hi3xxx/platsmp.c b/arch/arm/mach-hi3xxx/platsmp.c
index e532c69..a3d1b3f 100644
--- a/arch/arm/mach-hi3xxx/platsmp.c
+++ b/arch/arm/mach-hi3xxx/platsmp.c
@@ -73,6 +73,7 @@ static void __init hi3xxx_smp_prepare_cpus(unsigned int max_cpus)
static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
+ hi3xxx_set_cpu(cpu, true);
hi3xxx_set_cpu_jump(cpu, secondary_startup);
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
return 0;
@@ -81,4 +82,8 @@ static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
struct smp_operations hi3xxx_smp_ops __initdata = {
.smp_prepare_cpus = hi3xxx_smp_prepare_cpus,
.smp_boot_secondary = hi3xxx_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = hi3xxx_cpu_die,
+ .cpu_kill = hi3xxx_cpu_kill,
+#endif
};
--
1.8.3.2
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