hotplug.c
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/*
* 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;
}