summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-hisi/hotplug.c
diff options
context:
space:
mode:
authorHaojian Zhuang <haojian.zhuang@linaro.org>2013-12-20 10:52:56 +0800
committerKevin Hilman <khilman@linaro.org>2013-12-20 08:23:01 -0800
commit389ee0c2ffedf5819dccc2c67dd15757c4550765 (patch)
tree6b59caa70e41a290b8957d5383fe2b22ebee31a6 /arch/arm/mach-hisi/hotplug.c
parent22e99a6d43f2ccd1d1a28c65a803bb71ea293098 (diff)
downloadop-kernel-dev-389ee0c2ffedf5819dccc2c67dd15757c4550765.zip
op-kernel-dev-389ee0c2ffedf5819dccc2c67dd15757c4550765.tar.gz
ARM: hisi: rename hi3xxx to hisi
Since some new Hisilicon SoCs are not named as hi3xxx, rename mach-hi3xxx to mach-hisi instead. And the pronounciation of "hisi" is similar to the chinese pronounciation of Hisilicon. So Hisilicon guys like this name. ARCH_HI3xxx will be renamed later since other drivers are using it and they are still in linux-next git tree. So rename ARCH_HI3xxx later. Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'arch/arm/mach-hisi/hotplug.c')
-rw-r--r--arch/arm/mach-hisi/hotplug.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/arch/arm/mach-hisi/hotplug.c b/arch/arm/mach-hisi/hotplug.c
new file mode 100644
index 0000000..b909854
--- /dev/null
+++ b/arch/arm/mach-hisi/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;
+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;
+}
OpenPOWER on IntegriCloud