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/*
* Copyright 2014 Linaro Ltd.
* Copyright (C) 2014 ZTE Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/fncpy.h>
#include <asm/proc-fns.h>
#include <asm/smp_scu.h>
#include <asm/smp_plat.h>
#include "core.h"
#define AON_SYS_CTRL_RESERVED1 0xa8
#define BUS_MATRIX_REMAP_CONFIG 0x00
#define PCU_CPU0_CTRL 0x00
#define PCU_CPU1_CTRL 0x04
#define PCU_CPU1_ST 0x0c
#define PCU_GLOBAL_CTRL 0x14
#define PCU_EXPEND_CONTROL 0x34
#define ZX_IRAM_BASE 0x00200000
static void __iomem *pcu_base;
static void __iomem *matrix_base;
static void __iomem *scu_base;
void __init zx_smp_prepare_cpus(unsigned int max_cpus)
{
struct device_node *np;
unsigned long base = 0;
void __iomem *aonsysctrl_base;
void __iomem *sys_iram;
base = scu_a9_get_base();
scu_base = ioremap(base, SZ_256);
if (!scu_base) {
pr_err("%s: failed to map scu\n", __func__);
return;
}
scu_enable(scu_base);
np = of_find_compatible_node(NULL, NULL, "zte,sysctrl");
if (!np) {
pr_err("%s: failed to find sysctrl node\n", __func__);
return;
}
aonsysctrl_base = of_iomap(np, 0);
if (!aonsysctrl_base) {
pr_err("%s: failed to map aonsysctrl\n", __func__);
of_node_put(np);
return;
}
/*
* Write the address of secondary startup into the
* system-wide flags register. The BootMonitor waits
* until it receives a soft interrupt, and then the
* secondary CPU branches to this address.
*/
__raw_writel(__pa_symbol(zx_secondary_startup),
aonsysctrl_base + AON_SYS_CTRL_RESERVED1);
iounmap(aonsysctrl_base);
of_node_put(np);
np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu");
pcu_base = of_iomap(np, 0);
of_node_put(np);
WARN_ON(!pcu_base);
np = of_find_compatible_node(NULL, NULL, "zte,zx-bus-matrix");
matrix_base = of_iomap(np, 0);
of_node_put(np);
WARN_ON(!matrix_base);
/* Map the first 4 KB IRAM for suspend usage */
sys_iram = __arm_ioremap_exec(ZX_IRAM_BASE, PAGE_SIZE, false);
zx_secondary_startup_pa = __pa_symbol(zx_secondary_startup);
fncpy(sys_iram, &zx_resume_jump, zx_suspend_iram_sz);
}
static int zx_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
static bool first_boot = true;
if (first_boot) {
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
first_boot = false;
return 0;
}
/* Swap the base address mapping between IRAM and IROM */
writel_relaxed(0x1, matrix_base + BUS_MATRIX_REMAP_CONFIG);
/* Power on CPU1 */
writel_relaxed(0x0, pcu_base + PCU_CPU1_CTRL);
/* Wait for power on ack */
while (readl_relaxed(pcu_base + PCU_CPU1_ST) & 0x4)
cpu_relax();
/* Swap back the mapping of IRAM and IROM */
writel_relaxed(0x0, matrix_base + BUS_MATRIX_REMAP_CONFIG);
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
static inline void cpu_enter_lowpower(void)
{
unsigned int v;
asm volatile(
"mcr p15, 0, %1, c7, c5, 0\n"
" mcr p15, 0, %1, c7, c10, 4\n"
/*
* Turn off coherency
*/
" mrc p15, 0, %0, c1, c0, 1\n"
" bic %0, %0, %3\n"
" mcr p15, 0, %0, c1, c0, 1\n"
" mrc p15, 0, %0, c1, c0, 0\n"
" bic %0, %0, %2\n"
" mcr p15, 0, %0, c1, c0, 0\n"
: "=&r" (v)
: "r" (0), "Ir" (CR_C), "Ir" (0x40)
: "cc");
}
static int zx_cpu_kill(unsigned int cpu)
{
unsigned long timeout = jiffies + msecs_to_jiffies(2000);
writel_relaxed(0x2, pcu_base + PCU_CPU1_CTRL);
while ((readl_relaxed(pcu_base + PCU_CPU1_ST) & 0x3) != 0x0) {
if (time_after(jiffies, timeout)) {
pr_err("*** cpu1 poweroff timeout\n");
break;
}
}
return 1;
}
static void zx_cpu_die(unsigned int cpu)
{
scu_power_mode(scu_base, SCU_PM_POWEROFF);
cpu_enter_lowpower();
while (1)
cpu_do_idle();
}
#endif
static void zx_secondary_init(unsigned int cpu)
{
scu_power_mode(scu_base, SCU_PM_NORMAL);
}
static const struct smp_operations zx_smp_ops __initconst = {
.smp_prepare_cpus = zx_smp_prepare_cpus,
.smp_secondary_init = zx_secondary_init,
.smp_boot_secondary = zx_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_kill = zx_cpu_kill,
.cpu_die = zx_cpu_die,
#endif
};
CPU_METHOD_OF_DECLARE(zx_smp, "zte,zx296702-smp", &zx_smp_ops);
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