101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2002 ARM Ltd.
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* Copyright (C) 2008 STMicroelctronics.
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* Copyright (C) 2009 ST-Ericsson.
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* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
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*
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* This file is based on arm realview platform
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/device.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_plat.h>
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#include <asm/smp_scu.h>
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/* Magic triggers in backup RAM */
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#define UX500_CPU1_JUMPADDR_OFFSET 0x1FF4
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#define UX500_CPU1_WAKEMAGIC_OFFSET 0x1FF0
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static void __iomem *backupram;
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static void __init ux500_smp_prepare_cpus(unsigned int max_cpus)
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{
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struct device_node *np;
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static void __iomem *scu_base;
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unsigned int ncores;
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int i;
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np = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram");
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if (!np) {
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pr_err("No backupram base address\n");
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return;
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}
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backupram = of_iomap(np, 0);
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of_node_put(np);
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if (!backupram) {
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pr_err("No backupram remap\n");
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return;
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}
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np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
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if (!np) {
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pr_err("No SCU base address\n");
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return;
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}
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scu_base = of_iomap(np, 0);
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of_node_put(np);
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if (!scu_base) {
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pr_err("No SCU remap\n");
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return;
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}
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scu_enable(scu_base);
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ncores = scu_get_core_count(scu_base);
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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iounmap(scu_base);
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}
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static int ux500_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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/*
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* write the address of secondary startup into the backup ram register
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* at offset 0x1FF4, then write the magic number 0xA1FEED01 to the
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* backup ram register at offset 0x1FF0, which is what boot rom code
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* is waiting for. This will wake up the secondary core from WFE.
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*/
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writel(__pa_symbol(secondary_startup),
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backupram + UX500_CPU1_JUMPADDR_OFFSET);
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writel(0xA1FEED01,
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backupram + UX500_CPU1_WAKEMAGIC_OFFSET);
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/* make sure write buffer is drained */
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mb();
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arch_send_wakeup_ipi_mask(cpumask_of(cpu));
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return 0;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void ux500_cpu_die(unsigned int cpu)
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{
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wfi();
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}
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#endif
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static const struct smp_operations ux500_smp_ops __initconst = {
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.smp_prepare_cpus = ux500_smp_prepare_cpus,
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.smp_boot_secondary = ux500_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = ux500_cpu_die,
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#endif
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};
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CPU_METHOD_OF_DECLARE(ux500_smp, "ste,dbx500-smp", &ux500_smp_ops);
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