// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <linux/console.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/aperture.h>

#include <drm/clients/drm_client_setup.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_module.h>
#include <drm/drm_probe_helper.h>

#include "tidss_dispc.h"
#include "tidss_drv.h"
#include "tidss_kms.h"
#include "tidss_irq.h"
#include "tidss_oldi.h"

/* Power management */

int tidss_runtime_get(struct tidss_device *tidss)
{
        int r;

        r = pm_runtime_resume_and_get(tidss->dev);
        WARN_ON(r < 0);
        return r;
}

void tidss_runtime_put(struct tidss_device *tidss)
{
        int r;

        pm_runtime_mark_last_busy(tidss->dev);

        r = pm_runtime_put_autosuspend(tidss->dev);
        WARN_ON(r < 0);
}

static int __maybe_unused tidss_pm_runtime_suspend(struct device *dev)
{
        struct tidss_device *tidss = dev_get_drvdata(dev);

        return dispc_runtime_suspend(tidss->dispc);
}

static int __maybe_unused tidss_pm_runtime_resume(struct device *dev)
{
        struct tidss_device *tidss = dev_get_drvdata(dev);
        int r;

        r = dispc_runtime_resume(tidss->dispc);
        if (r)
                return r;

        return 0;
}

static int __maybe_unused tidss_suspend(struct device *dev)
{
        struct tidss_device *tidss = dev_get_drvdata(dev);

        return drm_mode_config_helper_suspend(&tidss->ddev);
}

static int __maybe_unused tidss_resume(struct device *dev)
{
        struct tidss_device *tidss = dev_get_drvdata(dev);

        return drm_mode_config_helper_resume(&tidss->ddev);
}

static __maybe_unused const struct dev_pm_ops tidss_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(tidss_suspend, tidss_resume)
        SET_RUNTIME_PM_OPS(tidss_pm_runtime_suspend, tidss_pm_runtime_resume, NULL)
};

/* DRM device Information */

static void tidss_release(struct drm_device *ddev)
{
        drm_kms_helper_poll_fini(ddev);
}

DEFINE_DRM_GEM_DMA_FOPS(tidss_fops);

static const struct drm_driver tidss_driver = {
        .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
        .fops                   = &tidss_fops,
        .release                = tidss_release,
        DRM_GEM_DMA_DRIVER_OPS_VMAP,
        DRM_FBDEV_DMA_DRIVER_OPS,
        .name                   = "tidss",
        .desc                   = "TI Keystone DSS",
        .major                  = 1,
        .minor                  = 0,
};

static int tidss_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct tidss_device *tidss;
        struct drm_device *ddev;
        int ret;
        int irq;

        tidss = devm_drm_dev_alloc(&pdev->dev, &tidss_driver,
                                   struct tidss_device, ddev);
        if (IS_ERR(tidss))
                return PTR_ERR(tidss);

        ddev = &tidss->ddev;

        tidss->dev = dev;
        tidss->feat = of_device_get_match_data(dev);

        platform_set_drvdata(pdev, tidss);

        spin_lock_init(&tidss->irq_lock);

        ret = dispc_init(tidss);
        if (ret) {
                dev_err(dev, "failed to initialize dispc: %d\n", ret);
                return ret;
        }

        ret = tidss_oldi_init(tidss);
        if (ret)
                return dev_err_probe(dev, ret, "failed to init OLDI\n");

        pm_runtime_enable(dev);

        pm_runtime_set_autosuspend_delay(dev, 1000);
        pm_runtime_use_autosuspend(dev);

#ifndef CONFIG_PM
        /* If we don't have PM, we need to call resume manually */
        dispc_runtime_resume(tidss->dispc);
#endif

        ret = tidss_modeset_init(tidss);
        if (ret < 0) {
                if (ret != -EPROBE_DEFER)
                        dev_err(dev, "failed to init DRM/KMS (%d)\n", ret);
                goto err_runtime_suspend;
        }

        irq = platform_get_irq(pdev, 0);
        if (irq < 0) {
                ret = irq;
                goto err_runtime_suspend;
        }
        tidss->irq = irq;

        ret = tidss_irq_install(ddev, irq);
        if (ret) {
                dev_err(dev, "tidss_irq_install failed: %d\n", ret);
                goto err_runtime_suspend;
        }

        drm_kms_helper_poll_init(ddev);

        drm_mode_config_reset(ddev);

        ret = drm_dev_register(ddev, 0);
        if (ret) {
                dev_err(dev, "failed to register DRM device\n");
                goto err_irq_uninstall;
        }

        /* Remove possible early fb before setting up the fbdev */
        ret = aperture_remove_all_conflicting_devices(tidss_driver.name);
        if (ret)
                goto err_drm_dev_unreg;

        drm_client_setup(ddev, NULL);

        dev_dbg(dev, "%s done\n", __func__);

        return 0;

err_drm_dev_unreg:
        drm_dev_unregister(ddev);

err_irq_uninstall:
        tidss_irq_uninstall(ddev);

err_runtime_suspend:
#ifndef CONFIG_PM
        dispc_runtime_suspend(tidss->dispc);
#endif
        pm_runtime_dont_use_autosuspend(dev);
        pm_runtime_disable(dev);

        tidss_oldi_deinit(tidss);

        return ret;
}

static void tidss_remove(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct tidss_device *tidss = platform_get_drvdata(pdev);
        struct drm_device *ddev = &tidss->ddev;

        drm_dev_unregister(ddev);

        drm_atomic_helper_shutdown(ddev);

        tidss_irq_uninstall(ddev);

#ifndef CONFIG_PM
        /* If we don't have PM, we need to call suspend manually */
        dispc_runtime_suspend(tidss->dispc);
#endif
        pm_runtime_dont_use_autosuspend(dev);
        pm_runtime_disable(dev);

        tidss_oldi_deinit(tidss);

        /* devm allocated dispc goes away with the dev so mark it NULL */
        dispc_remove(tidss);

        dev_dbg(dev, "%s done\n", __func__);
}

static void tidss_shutdown(struct platform_device *pdev)
{
        drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
}

static const struct of_device_id tidss_of_table[] = {
        { .compatible = "ti,k2g-dss", .data = &dispc_k2g_feats, },
        { .compatible = "ti,am625-dss", .data = &dispc_am625_feats, },
        { .compatible = "ti,am62a7-dss", .data = &dispc_am62a7_feats, },
        { .compatible = "ti,am62l-dss", .data = &dispc_am62l_feats, },
        { .compatible = "ti,am65x-dss", .data = &dispc_am65x_feats, },
        { .compatible = "ti,j721e-dss", .data = &dispc_j721e_feats, },
        { }
};

MODULE_DEVICE_TABLE(of, tidss_of_table);

static struct platform_driver tidss_platform_driver = {
        .probe          = tidss_probe,
        .remove         = tidss_remove,
        .shutdown       = tidss_shutdown,
        .driver         = {
                .name   = "tidss",
                .pm     = pm_ptr(&tidss_pm_ops),
                .of_match_table = tidss_of_table,
                .suppress_bind_attrs = true,
        },
};

drm_module_platform_driver(tidss_platform_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TI Keystone DSS Driver");
MODULE_LICENSE("GPL v2");