// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 MediaTek Inc.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/kthread.h>

#include <sspm_ipi.h>
#include <sspm_ipi_pin.h>

#include "mtk_qos_ipi.h"
#include "mtk_qos_sram.h"
#include "mtk_qos_bound.h"
#include "mtk_qos_sysfs.h"
#include "mtk_qos_common.h"

struct mtk_qos *m_qos;
static void __iomem *qos_sram_base;
static unsigned int qos_sram_bound;

int qos_ipi_to_sspm_command(void *buffer, int slot)
{
#if defined(CONFIG_MTK_TINYSYS_SSPM_SUPPORT)
	int ack_data = 0;
	struct qos_ipi_data *qos_ipi = buffer;

	if (!m_qos)
		return -EACCES;
	if (m_qos->soc->ipi_pin[qos_ipi->cmd].valid == false)
		return -EPERM;

	qos_ipi->cmd = m_qos->soc->ipi_pin[qos_ipi->cmd].id;
	sspm_ipi_send_sync(IPI_ID_QOS, IPI_OPT_POLLING,
			buffer, slot, &ack_data, 1);

	return ack_data;
#else
	return 0;
#endif
}


void qos_ipi_init(struct mtk_qos *qos)
{
	if (qos->soc->qos_ipi_recv_handler)
		kthread_run(qos->soc->qos_ipi_recv_handler,
			qos, "qos_ipi_recv");
}



u32 qos_sram_read(u32 id)
{
	u32 offset;

	if (!m_qos)
		return 0;
	if (m_qos->soc->sram_pin[id].valid == false)
		return 0;
	if (id >= QOS_SRAM_ID_MAX)
		return 0;

	offset = m_qos->soc->sram_pin[id].offset;
	if (!qos_sram_base || offset >= qos_sram_bound)
		return 0;

	return readl(qos_sram_base + offset);
}

void qos_sram_write(u32 id, u32 val)
{
	u32 offset;

	if (!m_qos)
		return;
	if (m_qos->soc->sram_pin[id].valid == false)
		return;
	if (id >= QOS_SRAM_ID_MAX)
		return;

	offset = m_qos->soc->sram_pin[id].offset;
	if (!qos_sram_base || offset >= qos_sram_bound)
		return;

	writel(val, qos_sram_base + offset);
}

void qos_sram_init(void __iomem *regs, unsigned int bound)
{
	int i;

	qos_sram_base = regs;
	qos_sram_bound = bound;
	pr_info("qos_sram addr:0x%x len:%d\n",
		qos_sram_base, qos_sram_bound);

	for (i = 0; i < bound; i += 4)
		writel(0x0, qos_sram_base+i);
}


int mtk_qos_probe(struct platform_device *pdev,
			const struct mtk_qos_soc *soc)
{
	struct resource *res;
	struct mtk_qos *qos;

	qos = devm_kzalloc(&pdev->dev, sizeof(*qos), GFP_KERNEL);
	if (!qos)
		return -ENOMEM;

	qos->soc = of_device_get_match_data(&pdev->dev);
	if (!qos->soc)
		return -EINVAL;


	qos->soc = soc;
	qos->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	qos->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(qos->regs))
		return PTR_ERR(qos->regs);
	qos->regsize = (unsigned int) resource_size(res);
	m_qos = qos;
	qos_sram_init(qos->regs, qos->regsize);
	qos_add_interface(&pdev->dev);
	qos_ipi_init(qos);

	if (qos->soc->ipi_pin[QOS_IPI_QOS_BOUND].valid == true)
		qos_bound_init();

	platform_set_drvdata(pdev, qos);

	pr_info("mtkqos:%s done\n", __func__);

	return 0;
}

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek QoS driver");