/*
 * Qualcomm ADSP/SLPI Peripheral Image Loader for MSM8974 and MSM8996
 *
 * Copyright (C) 2016 Linaro Ltd
 * Copyright (C) 2014 Sony Mobile Communications AB
 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
 *
 * 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/clk.h>
#include <linux/firmware.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/qcom_scm.h>
#include <linux/regulator/consumer.h>
#include <linux/remoteproc.h>
#include <linux/soc/qcom/mdt_loader.h>
#include <linux/soc/qcom/smem.h>
#include <linux/soc/qcom/smem_state.h>

#include "qcom_common.h"
#include "qcom_q6v5.h"
#include "remoteproc_internal.h"

struct adsp_data {
	int crash_reason_smem;
	const char *firmware_name;
	int pas_id;
	bool has_aggre2_clk;

	const char *ssr_name;
	const char *sysmon_name;
	int ssctl_id;
};

struct qcom_adsp {
	struct device *dev;
	struct rproc *rproc;

	struct qcom_q6v5 q6v5;

	struct clk *xo;
	struct clk *aggre2_clk;

	struct regulator *cx_supply;
	struct regulator *px_supply;

	int pas_id;
	int crash_reason_smem;
	bool has_aggre2_clk;

	struct completion start_done;
	struct completion stop_done;

	phys_addr_t mem_phys;
	phys_addr_t mem_reloc;
	void *mem_region;
	size_t mem_size;

	struct qcom_rproc_glink glink_subdev;
	struct qcom_rproc_subdev smd_subdev;
	struct qcom_rproc_ssr ssr_subdev;
	struct qcom_sysmon *sysmon;
};

static int adsp_load(struct rproc *rproc, const struct firmware *fw)
{
	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;

	return qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
			     adsp->mem_region, adsp->mem_phys, adsp->mem_size,
			     &adsp->mem_reloc);

}

static int adsp_start(struct rproc *rproc)
{
	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
	int ret;

	qcom_q6v5_prepare(&adsp->q6v5);

	ret = clk_prepare_enable(adsp->xo);
	if (ret)
		return ret;

	ret = clk_prepare_enable(adsp->aggre2_clk);
	if (ret)
		goto disable_xo_clk;

	ret = regulator_enable(adsp->cx_supply);
	if (ret)
		goto disable_aggre2_clk;

	ret = regulator_enable(adsp->px_supply);
	if (ret)
		goto disable_cx_supply;

	ret = qcom_scm_pas_auth_and_reset(adsp->pas_id);
	if (ret) {
		dev_err(adsp->dev,
			"failed to authenticate image and release reset\n");
		goto disable_px_supply;
	}

	ret = qcom_q6v5_wait_for_start(&adsp->q6v5, msecs_to_jiffies(5000));
	if (ret == -ETIMEDOUT) {
		dev_err(adsp->dev, "start timed out\n");
		qcom_scm_pas_shutdown(adsp->pas_id);
		goto disable_px_supply;
	}

	return 0;

disable_px_supply:
	regulator_disable(adsp->px_supply);
disable_cx_supply:
	regulator_disable(adsp->cx_supply);
disable_aggre2_clk:
	clk_disable_unprepare(adsp->aggre2_clk);
disable_xo_clk:
	clk_disable_unprepare(adsp->xo);

	return ret;
}

static void qcom_pas_handover(struct qcom_q6v5 *q6v5)
{
	struct qcom_adsp *adsp = container_of(q6v5, struct qcom_adsp, q6v5);

	regulator_disable(adsp->px_supply);
	regulator_disable(adsp->cx_supply);
	clk_disable_unprepare(adsp->aggre2_clk);
	clk_disable_unprepare(adsp->xo);
}

static int adsp_stop(struct rproc *rproc)
{
	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
	int handover;
	int ret;

	ret = qcom_q6v5_request_stop(&adsp->q6v5);
	if (ret == -ETIMEDOUT)
		dev_err(adsp->dev, "timed out on wait\n");

	ret = qcom_scm_pas_shutdown(adsp->pas_id);
	if (ret)
		dev_err(adsp->dev, "failed to shutdown: %d\n", ret);

	handover = qcom_q6v5_unprepare(&adsp->q6v5);
	if (handover)
		qcom_pas_handover(&adsp->q6v5);

	return ret;
}

static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
{
	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
	int offset;

	offset = da - adsp->mem_reloc;
	if (offset < 0 || offset + len > adsp->mem_size)
		return NULL;

	return adsp->mem_region + offset;
}

static const struct rproc_ops adsp_ops = {
	.start = adsp_start,
	.stop = adsp_stop,
	.da_to_va = adsp_da_to_va,
	.parse_fw = qcom_register_dump_segments,
	.load = adsp_load,
};

static int adsp_init_clock(struct qcom_adsp *adsp)
{
	int ret;

	adsp->xo = devm_clk_get(adsp->dev, "xo");
	if (IS_ERR(adsp->xo)) {
		ret = PTR_ERR(adsp->xo);
		if (ret != -EPROBE_DEFER)
			dev_err(adsp->dev, "failed to get xo clock");
		return ret;
	}

	if (adsp->has_aggre2_clk) {
		adsp->aggre2_clk = devm_clk_get(adsp->dev, "aggre2");
		if (IS_ERR(adsp->aggre2_clk)) {
			ret = PTR_ERR(adsp->aggre2_clk);
			if (ret != -EPROBE_DEFER)
				dev_err(adsp->dev,
					"failed to get aggre2 clock");
			return ret;
		}
	}

	return 0;
}

static int adsp_init_regulator(struct qcom_adsp *adsp)
{
	adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
	if (IS_ERR(adsp->cx_supply))
		return PTR_ERR(adsp->cx_supply);

	regulator_set_load(adsp->cx_supply, 100000);

	adsp->px_supply = devm_regulator_get(adsp->dev, "px");
	return PTR_ERR_OR_ZERO(adsp->px_supply);
}

static int adsp_alloc_memory_region(struct qcom_adsp *adsp)
{
	struct device_node *node;
	struct resource r;
	int ret;

	node = of_parse_phandle(adsp->dev->of_node, "memory-region", 0);
	if (!node) {
		dev_err(adsp->dev, "no memory-region specified\n");
		return -EINVAL;
	}

	ret = of_address_to_resource(node, 0, &r);
	if (ret)
		return ret;

	adsp->mem_phys = adsp->mem_reloc = r.start;
	adsp->mem_size = resource_size(&r);
	adsp->mem_region = devm_ioremap_wc(adsp->dev, adsp->mem_phys, adsp->mem_size);
	if (!adsp->mem_region) {
		dev_err(adsp->dev, "unable to map memory region: %pa+%zx\n",
			&r.start, adsp->mem_size);
		return -EBUSY;
	}

	return 0;
}

static int adsp_probe(struct platform_device *pdev)
{
	const struct adsp_data *desc;
	struct qcom_adsp *adsp;
	struct rproc *rproc;
	int ret;

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

	if (!qcom_scm_is_available())
		return -EPROBE_DEFER;

	rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_ops,
			    desc->firmware_name, sizeof(*adsp));
	if (!rproc) {
		dev_err(&pdev->dev, "unable to allocate remoteproc\n");
		return -ENOMEM;
	}

	adsp = (struct qcom_adsp *)rproc->priv;
	adsp->dev = &pdev->dev;
	adsp->rproc = rproc;
	adsp->pas_id = desc->pas_id;
	adsp->has_aggre2_clk = desc->has_aggre2_clk;
	platform_set_drvdata(pdev, adsp);

	ret = adsp_alloc_memory_region(adsp);
	if (ret)
		goto free_rproc;

	ret = adsp_init_clock(adsp);
	if (ret)
		goto free_rproc;

	ret = adsp_init_regulator(adsp);
	if (ret)
		goto free_rproc;

	ret = qcom_q6v5_init(&adsp->q6v5, pdev, rproc, desc->crash_reason_smem,
			     qcom_pas_handover);
	if (ret)
		goto free_rproc;

	qcom_add_glink_subdev(rproc, &adsp->glink_subdev);
	qcom_add_smd_subdev(rproc, &adsp->smd_subdev);
	qcom_add_ssr_subdev(rproc, &adsp->ssr_subdev, desc->ssr_name);
	adsp->sysmon = qcom_add_sysmon_subdev(rproc,
					      desc->sysmon_name,
					      desc->ssctl_id);

	ret = rproc_add(rproc);
	if (ret)
		goto free_rproc;

	return 0;

free_rproc:
	rproc_free(rproc);

	return ret;
}

static int adsp_remove(struct platform_device *pdev)
{
	struct qcom_adsp *adsp = platform_get_drvdata(pdev);

	rproc_del(adsp->rproc);

	qcom_remove_glink_subdev(adsp->rproc, &adsp->glink_subdev);
	qcom_remove_sysmon_subdev(adsp->sysmon);
	qcom_remove_smd_subdev(adsp->rproc, &adsp->smd_subdev);
	qcom_remove_ssr_subdev(adsp->rproc, &adsp->ssr_subdev);
	rproc_free(adsp->rproc);

	return 0;
}

static const struct adsp_data adsp_resource_init = {
		.crash_reason_smem = 423,
		.firmware_name = "adsp.mdt",
		.pas_id = 1,
		.has_aggre2_clk = false,
		.ssr_name = "lpass",
		.sysmon_name = "adsp",
		.ssctl_id = 0x14,
};

static const struct adsp_data slpi_resource_init = {
		.crash_reason_smem = 424,
		.firmware_name = "slpi.mdt",
		.pas_id = 12,
		.has_aggre2_clk = true,
		.ssr_name = "dsps",
		.sysmon_name = "slpi",
		.ssctl_id = 0x16,
};

static const struct of_device_id adsp_of_match[] = {
	{ .compatible = "qcom,msm8974-adsp-pil", .data = &adsp_resource_init},
	{ .compatible = "qcom,msm8996-adsp-pil", .data = &adsp_resource_init},
	{ .compatible = "qcom,msm8996-slpi-pil", .data = &slpi_resource_init},
	{ },
};
MODULE_DEVICE_TABLE(of, adsp_of_match);

static struct platform_driver adsp_driver = {
	.probe = adsp_probe,
	.remove = adsp_remove,
	.driver = {
		.name = "qcom_adsp_pil",
		.of_match_table = adsp_of_match,
	},
};

module_platform_driver(adsp_driver);
MODULE_DESCRIPTION("Qualcomm MSM8974/MSM8996 ADSP Peripherial Image Loader");
MODULE_LICENSE("GPL v2");