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