// SPDX-License-Identifier: GPL-2.0+
/*
 * RZ/G2L Display Unit DRM driver
 *
 * Copyright (C) 2023 Renesas Electronics Corporation
 *
 * Based on rcar_du_drv.c
 */

#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#include <drm/clients/drm_client_setup.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#include "rzg2l_du_drv.h"
#include "rzg2l_du_kms.h"

/* -----------------------------------------------------------------------------
 * Device Information
 */

static const struct rzg2l_du_device_info rzg2l_du_r9a07g043u_info = {
        .channels_mask = BIT(0),
        .routes = {
                [RZG2L_DU_OUTPUT_DPAD0] = {
                        .possible_outputs = BIT(0),
                        .port = 0,
                },
        },
        .mode_clock_min = 20875,
        .mode_clock_max = 83500,
};

static const struct rzg2l_du_device_info rzg2l_du_r9a07g044_info = {
        .channels_mask = BIT(0),
        .routes = {
                [RZG2L_DU_OUTPUT_DSI0] = {
                        .possible_outputs = BIT(0),
                        .port = 0,
                },
                [RZG2L_DU_OUTPUT_DPAD0] = {
                        .possible_outputs = BIT(0),
                        .port = 1,
                }
        },
        .mode_clock_min = 20875,
        .mode_clock_max = 83500,
};

static const struct rzg2l_du_device_info rzg2l_du_r9a09g057_info = {
        .channels_mask = BIT(0),
        .routes = {
                [RZG2L_DU_OUTPUT_DSI0] = {
                        .possible_outputs = BIT(0),
                        .port = 0,
                },
        },
};

static const struct rzg2l_du_device_info rzg2l_du_r9a09g077_info = {
        .channels_mask = BIT(0),
        .routes = {
                [RZG2L_DU_OUTPUT_DPAD0] = {
                        .possible_outputs = BIT(0),
                        .port = 0,
                },
        },
        .features = RZG2L_DU_FEATURE_DPIO_OE,
        .mode_clock_min = 5000,
        .mode_clock_max = 100000,
};

static const struct of_device_id rzg2l_du_of_table[] = {
        { .compatible = "renesas,r9a07g043u-du", .data = &rzg2l_du_r9a07g043u_info },
        { .compatible = "renesas,r9a07g044-du", .data = &rzg2l_du_r9a07g044_info },
        { .compatible = "renesas,r9a09g057-du", .data = &rzg2l_du_r9a09g057_info },
        { .compatible = "renesas,r9a09g077-du", .data = &rzg2l_du_r9a09g077_info },
        { /* sentinel */ }
};

MODULE_DEVICE_TABLE(of, rzg2l_du_of_table);

const char *rzg2l_du_output_name(enum rzg2l_du_output output)
{
        static const char * const names[] = {
                [RZG2L_DU_OUTPUT_DSI0] = "DSI0",
                [RZG2L_DU_OUTPUT_DPAD0] = "DPAD0"
        };

        if (output >= ARRAY_SIZE(names))
                return "UNKNOWN";

        return names[output];
}

/* -----------------------------------------------------------------------------
 * DRM operations
 */

DEFINE_DRM_GEM_DMA_FOPS(rzg2l_du_fops);

static const struct drm_driver rzg2l_du_driver = {
        .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
        DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(rzg2l_du_dumb_create),
        DRM_FBDEV_DMA_DRIVER_OPS,
        .fops                   = &rzg2l_du_fops,
        .name                   = "rzg2l-du",
        .desc                   = "Renesas RZ/G2L Display Unit",
        .major                  = 1,
        .minor                  = 0,
};

/* -----------------------------------------------------------------------------
 * Platform driver
 */

static void rzg2l_du_remove(struct platform_device *pdev)
{
        struct rzg2l_du_device *rcdu = platform_get_drvdata(pdev);
        struct drm_device *ddev = &rcdu->ddev;

        drm_dev_unregister(ddev);
        drm_atomic_helper_shutdown(ddev);

        drm_kms_helper_poll_fini(ddev);
}

static void rzg2l_du_shutdown(struct platform_device *pdev)
{
        struct rzg2l_du_device *rcdu = platform_get_drvdata(pdev);

        drm_atomic_helper_shutdown(&rcdu->ddev);
}

static int rzg2l_du_probe(struct platform_device *pdev)
{
        struct rzg2l_du_device *rcdu;
        int ret;

        if (drm_firmware_drivers_only())
                return -ENODEV;

        /* Allocate and initialize the RZ/G2L device structure. */
        rcdu = devm_drm_dev_alloc(&pdev->dev, &rzg2l_du_driver,
                                  struct rzg2l_du_device, ddev);
        if (IS_ERR(rcdu))
                return PTR_ERR(rcdu);

        rcdu->dev = &pdev->dev;
        rcdu->info = of_device_get_match_data(rcdu->dev);

        platform_set_drvdata(pdev, rcdu);

        /* I/O resources */
        rcdu->mmio = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(rcdu->mmio))
                return PTR_ERR(rcdu->mmio);

        ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
        if (ret)
                return ret;

        /* DRM/KMS objects */
        ret = rzg2l_du_modeset_init(rcdu);
        if (ret < 0) {
                /*
                 * Don't use dev_err_probe(), as it would overwrite the probe
                 * deferral reason recorded in rzg2l_du_modeset_init().
                 */
                if (ret != -EPROBE_DEFER)
                        dev_err(&pdev->dev,
                                "failed to initialize DRM/KMS (%d)\n", ret);
                goto error;
        }

        /*
         * Register the DRM device with the core and the connectors with
         * sysfs.
         */
        ret = drm_dev_register(&rcdu->ddev, 0);
        if (ret)
                goto error;

        drm_info(&rcdu->ddev, "Device %s probed\n", dev_name(&pdev->dev));

        drm_client_setup(&rcdu->ddev, NULL);

        return 0;

error:
        drm_kms_helper_poll_fini(&rcdu->ddev);
        return ret;
}

static struct platform_driver rzg2l_du_platform_driver = {
        .probe          = rzg2l_du_probe,
        .remove         = rzg2l_du_remove,
        .shutdown       = rzg2l_du_shutdown,
        .driver         = {
                .name   = "rzg2l-du",
                .of_match_table = rzg2l_du_of_table,
        },
};

module_platform_driver(rzg2l_du_platform_driver);

MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
MODULE_DESCRIPTION("Renesas RZ/G2L Display Unit DRM Driver");
MODULE_LICENSE("GPL");