forked from Minki/linux
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/*
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* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/sizes.h>
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <asm/smp.h>
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#include <asm/smp_scu.h>
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static struct regmap *sbcm_regmap;
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static void __init uniphier_smp_prepare_cpus(unsigned int max_cpus)
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{
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static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
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unsigned long scu_base_phys = 0;
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void __iomem *scu_base;
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sbcm_regmap = syscon_regmap_lookup_by_compatible(
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"socionext,uniphier-system-bus-controller-misc");
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if (IS_ERR(sbcm_regmap)) {
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pr_err("failed to regmap system-bus-controller-misc\n");
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goto err;
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}
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if (scu_a9_has_base())
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scu_base_phys = scu_a9_get_base();
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if (!scu_base_phys) {
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pr_err("failed to get scu base\n");
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goto err;
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}
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scu_base = ioremap(scu_base_phys, SZ_128);
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if (!scu_base) {
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pr_err("failed to remap scu base (0x%08lx)\n", scu_base_phys);
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goto err;
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}
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scu_enable(scu_base);
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iounmap(scu_base);
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return;
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err:
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pr_warn("disabling SMP\n");
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init_cpu_present(&only_cpu_0);
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sbcm_regmap = NULL;
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}
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static void __naked uniphier_secondary_startup(void)
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{
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asm("bl v7_invalidate_l1\n"
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"b secondary_startup\n");
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};
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static int uniphier_boot_secondary(unsigned int cpu,
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struct task_struct *idle)
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{
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int ret;
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if (!sbcm_regmap)
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return -ENODEV;
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ret = regmap_write(sbcm_regmap, 0x1208,
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virt_to_phys(uniphier_secondary_startup));
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if (!ret)
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asm("sev"); /* wake up secondary CPU */
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return ret;
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}
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struct smp_operations uniphier_smp_ops __initdata = {
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.smp_prepare_cpus = uniphier_smp_prepare_cpus,
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.smp_boot_secondary = uniphier_boot_secondary,
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};
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CPU_METHOD_OF_DECLARE(uniphier_smp, "socionext,uniphier-smp",
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&uniphier_smp_ops);
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