/*
 * arch/arm/mach-mediatek/platsmp.c
 *
 * Copyright (c) 2014 Mediatek Inc.
 * Author: Shunli Wang <shunli.wang@mediatek.com>
 *         Yingjoe Chen <yingjoe.chen@mediatek.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/string.h>
#include <linux/threads.h>

#define MTK_MAX_CPU		8
#define MTK_SMP_REG_SIZE	0x1000

struct mtk_smp_boot_info {
	unsigned long smp_base;
	unsigned int jump_reg;
	unsigned int core_keys[MTK_MAX_CPU - 1];
	unsigned int core_regs[MTK_MAX_CPU - 1];
};

static const struct mtk_smp_boot_info mtk_mt8135_tz_boot = {
	0x80002000, 0x3fc,
	{ 0x534c4131, 0x4c415332, 0x41534c33 },
	{ 0x3f8, 0x3f8, 0x3f8 },
};

static const struct mtk_smp_boot_info mtk_mt6589_boot = {
	0x10002000, 0x34,
	{ 0x534c4131, 0x4c415332, 0x41534c33 },
	{ 0x38, 0x3c, 0x40 },
};

static const struct of_device_id mtk_tz_smp_boot_infos[] __initconst = {
	{ .compatible   = "mediatek,mt8135", .data = &mtk_mt8135_tz_boot },
	{ .compatible   = "mediatek,mt8127", .data = &mtk_mt8135_tz_boot },
};

static const struct of_device_id mtk_smp_boot_infos[] __initconst = {
	{ .compatible   = "mediatek,mt6589", .data = &mtk_mt6589_boot },
};

static void __iomem *mtk_smp_base;
static const struct mtk_smp_boot_info *mtk_smp_info;

static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	if (!mtk_smp_base)
		return -EINVAL;

	if (!mtk_smp_info->core_keys[cpu-1])
		return -EINVAL;

	writel_relaxed(mtk_smp_info->core_keys[cpu-1],
		mtk_smp_base + mtk_smp_info->core_regs[cpu-1]);

	arch_send_wakeup_ipi_mask(cpumask_of(cpu));

	return 0;
}

static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone)
{
	int i, num;
	const struct of_device_id *infos;

	if (trustzone) {
		num = ARRAY_SIZE(mtk_tz_smp_boot_infos);
		infos = mtk_tz_smp_boot_infos;
	} else {
		num = ARRAY_SIZE(mtk_smp_boot_infos);
		infos = mtk_smp_boot_infos;
	}

	/* Find smp boot info for this SoC */
	for (i = 0; i < num; i++) {
		if (of_machine_is_compatible(infos[i].compatible)) {
			mtk_smp_info = infos[i].data;
			break;
		}
	}

	if (!mtk_smp_info) {
		pr_err("%s: Device is not supported\n", __func__);
		return;
	}

	if (trustzone) {
		/* smp_base(trustzone-bootinfo) is reserved by device tree */
		mtk_smp_base = phys_to_virt(mtk_smp_info->smp_base);
	} else {
		mtk_smp_base = ioremap(mtk_smp_info->smp_base, MTK_SMP_REG_SIZE);
		if (!mtk_smp_base) {
			pr_err("%s: Can't remap %lx\n", __func__,
				mtk_smp_info->smp_base);
			return;
		}
	}

	/*
	 * write the address of slave startup address into the system-wide
	 * jump register
	 */
	writel_relaxed(virt_to_phys(secondary_startup_arm),
			mtk_smp_base + mtk_smp_info->jump_reg);
}

static void __init mtk_tz_smp_prepare_cpus(unsigned int max_cpus)
{
	__mtk_smp_prepare_cpus(max_cpus, 1);
}

static void __init mtk_smp_prepare_cpus(unsigned int max_cpus)
{
	__mtk_smp_prepare_cpus(max_cpus, 0);
}

static struct smp_operations mt81xx_tz_smp_ops __initdata = {
	.smp_prepare_cpus = mtk_tz_smp_prepare_cpus,
	.smp_boot_secondary = mtk_boot_secondary,
};
CPU_METHOD_OF_DECLARE(mt81xx_tz_smp, "mediatek,mt81xx-tz-smp", &mt81xx_tz_smp_ops);

static struct smp_operations mt6589_smp_ops __initdata = {
	.smp_prepare_cpus = mtk_smp_prepare_cpus,
	.smp_boot_secondary = mtk_boot_secondary,
};
CPU_METHOD_OF_DECLARE(mt6589_smp, "mediatek,mt6589-smp", &mt6589_smp_ops);