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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Nuvoton Technology corporation.
// Copyright 2018 Google, Inc.
#define pr_fmt(fmt) "nuvoton,npcm7xx-smp: " fmt
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h>
#include <asm/smp.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#define NPCM7XX_SCRPAD_REG 0x13c
extern void npcm7xx_secondary_startup(void);
static int npcm7xx_smp_boot_secondary(unsigned int cpu,
struct task_struct *idle)
{
struct device_node *gcr_np;
void __iomem *gcr_base;
int ret = 0;
gcr_np = of_find_compatible_node(NULL, NULL, "nuvoton,npcm750-gcr");
if (!gcr_np) {
pr_err("no gcr device node\n");
ret = -ENODEV;
goto out;
}
gcr_base = of_iomap(gcr_np, 0);
if (!gcr_base) {
pr_err("could not iomap gcr");
ret = -ENOMEM;
goto out;
}
/* give boot ROM kernel start address. */
iowrite32(__pa_symbol(npcm7xx_secondary_startup), gcr_base +
NPCM7XX_SCRPAD_REG);
/* make sure the previous write is seen by all observers. */
dsb_sev();
iounmap(gcr_base);
out:
return ret;
}
static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus)
{
struct device_node *scu_np;
void __iomem *scu_base;
scu_np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
if (!scu_np) {
pr_err("no scu device node\n");
return;
}
scu_base = of_iomap(scu_np, 0);
if (!scu_base) {
pr_err("could not iomap scu");
return;
}
scu_enable(scu_base);
iounmap(scu_base);
}
static struct smp_operations npcm7xx_smp_ops __initdata = {
.smp_prepare_cpus = npcm7xx_smp_prepare_cpus,
.smp_boot_secondary = npcm7xx_smp_boot_secondary,
};
CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm750-smp", &npcm7xx_smp_ops);
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