// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2017, Linaro Ltd
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mailbox_controller.h>

#define QCOM_APCS_IPC_BITS      32

struct qcom_apcs_ipc {
        struct mbox_controller mbox;
        struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS];

        struct regmap *regmap;
        unsigned long offset;
        struct platform_device *clk;
};

struct qcom_apcs_ipc_data {
        int offset;
        char *clk_name;
};

static const struct qcom_apcs_ipc_data ipq6018_apcs_data = {
        .offset = 8, .clk_name = "qcom,apss-ipq6018-clk"
};

static const struct qcom_apcs_ipc_data msm8916_apcs_data = {
        .offset = 8, .clk_name = "qcom-apcs-msm8916-clk"
};

static const struct qcom_apcs_ipc_data msm8994_apcs_data = {
        .offset = 8, .clk_name = NULL
};

static const struct qcom_apcs_ipc_data msm8996_apcs_data = {
        .offset = 16, .clk_name = "qcom-apcs-msm8996-clk"
};

static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
        .offset = 12, .clk_name = NULL
};

static const struct qcom_apcs_ipc_data sdx55_apcs_data = {
        .offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk"
};

static const struct regmap_config apcs_regmap_config = {
        .reg_bits = 32,
        .reg_stride = 4,
        .val_bits = 32,
        .max_register = 0x1008,
};

static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
{
        struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
                                                  struct qcom_apcs_ipc, mbox);
        unsigned long idx = (unsigned long)chan->con_priv;

        return regmap_write(apcs->regmap, apcs->offset, BIT(idx));
}

static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
        .send_data = qcom_apcs_ipc_send_data,
};

static int qcom_apcs_ipc_probe(struct platform_device *pdev)
{
        struct qcom_apcs_ipc *apcs;
        const struct qcom_apcs_ipc_data *apcs_data;
        struct regmap *regmap;
        void __iomem *base;
        unsigned long i;
        int ret;

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

        base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(base))
                return PTR_ERR(base);

        regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config);
        if (IS_ERR(regmap))
                return PTR_ERR(regmap);

        apcs_data = of_device_get_match_data(&pdev->dev);

        apcs->regmap = regmap;
        apcs->offset = apcs_data->offset;

        /* Initialize channel identifiers */
        for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
                apcs->mbox_chans[i].con_priv = (void *)i;

        apcs->mbox.dev = &pdev->dev;
        apcs->mbox.ops = &qcom_apcs_ipc_ops;
        apcs->mbox.chans = apcs->mbox_chans;
        apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);

        ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox);
        if (ret) {
                dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
                return ret;
        }

        if (apcs_data->clk_name) {
                struct device_node *np = of_get_child_by_name(pdev->dev.of_node,
                                                              "clock-controller");
                struct platform_device_info pdevinfo = {
                        .parent = &pdev->dev,
                        .name = apcs_data->clk_name,
                        .id = PLATFORM_DEVID_AUTO,
                        .fwnode = of_fwnode_handle(np) ?: pdev->dev.fwnode,
                        .of_node_reused = !np,
                };

                apcs->clk = platform_device_register_full(&pdevinfo);
                of_node_put(np);
                if (IS_ERR(apcs->clk))
                        dev_err(&pdev->dev, "failed to register APCS clk\n");
        }

        platform_set_drvdata(pdev, apcs);

        return 0;
}

static void qcom_apcs_ipc_remove(struct platform_device *pdev)
{
        struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
        struct platform_device *clk = apcs->clk;

        platform_device_unregister(clk);
}

/* .data is the offset of the ipc register within the global block */
static const struct of_device_id qcom_apcs_ipc_of_match[] = {
        { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data },
        { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data },
        { .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data },
        { .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data },
        { .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
        { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
        /* Do not add any more entries using existing driver data */
        { .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
        { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,sm4250-apcs-hmss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,ipq5332-apcs-apps-global", .data = &ipq6018_apcs_data },
        { .compatible = "qcom,ipq5424-apcs-apps-global", .data = &msm8994_apcs_data },
        { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq6018_apcs_data },
        { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
        { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
        { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
        {}
};
MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);

static struct platform_driver qcom_apcs_ipc_driver = {
        .probe = qcom_apcs_ipc_probe,
        .remove = qcom_apcs_ipc_remove,
        .driver = {
                .name = "qcom_apcs_ipc",
                .of_match_table = qcom_apcs_ipc_of_match,
        },
};

static int __init qcom_apcs_ipc_init(void)
{
        return platform_driver_register(&qcom_apcs_ipc_driver);
}
postcore_initcall(qcom_apcs_ipc_init);

static void __exit qcom_apcs_ipc_exit(void)
{
        platform_driver_unregister(&qcom_apcs_ipc_driver);
}
module_exit(qcom_apcs_ipc_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm APCS IPC driver");