shmob_drm_drv.c

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/*
 * shmob_drm_drv.c  --  SH Mobile DRM driver
 *
 * Copyright (C) 2012 Renesas Corporation
 *
 * Laurent Pinchart ([email protected])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/slab.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>

#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"

/* -----------------------------------------------------------------------------
 * Hardware initialization
 */

static int __devinit shmob_drm_init_interface(struct shmob_drm_device *sdev)
{
    static const u32 ldmt1r[] = {
        [SHMOB_DRM_IFACE_RGB8] = LDMT1R_MIFTYP_RGB8,
        [SHMOB_DRM_IFACE_RGB9] = LDMT1R_MIFTYP_RGB9,
        [SHMOB_DRM_IFACE_RGB12A] = LDMT1R_MIFTYP_RGB12A,
        [SHMOB_DRM_IFACE_RGB12B] = LDMT1R_MIFTYP_RGB12B,
        [SHMOB_DRM_IFACE_RGB16] = LDMT1R_MIFTYP_RGB16,
        [SHMOB_DRM_IFACE_RGB18] = LDMT1R_MIFTYP_RGB18,
        [SHMOB_DRM_IFACE_RGB24] = LDMT1R_MIFTYP_RGB24,
        [SHMOB_DRM_IFACE_YUV422] = LDMT1R_MIFTYP_YCBCR,
        [SHMOB_DRM_IFACE_SYS8A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8A,
        [SHMOB_DRM_IFACE_SYS8B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8B,
        [SHMOB_DRM_IFACE_SYS8C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8C,
        [SHMOB_DRM_IFACE_SYS8D] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS8D,
        [SHMOB_DRM_IFACE_SYS9] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS9,
        [SHMOB_DRM_IFACE_SYS12] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS12,
        [SHMOB_DRM_IFACE_SYS16A] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16A,
        [SHMOB_DRM_IFACE_SYS16B] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16B,
        [SHMOB_DRM_IFACE_SYS16C] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS16C,
        [SHMOB_DRM_IFACE_SYS18] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS18,
        [SHMOB_DRM_IFACE_SYS24] = LDMT1R_IFM | LDMT1R_MIFTYP_SYS24,
    };

    if (sdev->pdata->iface.interface >= ARRAY_SIZE(ldmt1r)) {
        dev_err(sdev->dev, "invalid interface type %u\n",
            sdev->pdata->iface.interface);
        return -EINVAL;
    }

    sdev->ldmt1r = ldmt1r[sdev->pdata->iface.interface];
    return 0;
}

static int __devinit shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
                        enum shmob_drm_clk_source clksrc)
{
    struct clk *clk;
    char *clkname;

    switch (clksrc) {
    case SHMOB_DRM_CLK_BUS:
        clkname = "bus_clk";
        sdev->lddckr = LDDCKR_ICKSEL_BUS;
        break;
    case SHMOB_DRM_CLK_PERIPHERAL:
        clkname = "peripheral_clk";
        sdev->lddckr = LDDCKR_ICKSEL_MIPI;
        break;
    case SHMOB_DRM_CLK_EXTERNAL:
        clkname = NULL;
        sdev->lddckr = LDDCKR_ICKSEL_HDMI;
        break;
    default:
        return -EINVAL;
    }

    clk = clk_get(sdev->dev, clkname);
    if (IS_ERR(clk)) {
        dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
        return PTR_ERR(clk);
    }

    sdev->clock = clk;
    return 0;
}

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

static int shmob_drm_unload(struct drm_device *dev)
{
    struct shmob_drm_device *sdev = dev->dev_private;

    drm_kms_helper_poll_fini(dev);
    drm_mode_config_cleanup(dev);
    drm_vblank_cleanup(dev);
    drm_irq_uninstall(dev);

    if (sdev->clock)
        clk_put(sdev->clock);

    if (sdev->mmio)
        iounmap(sdev->mmio);

    dev->dev_private = NULL;
    kfree(sdev);

    return 0;
}

static int shmob_drm_load(struct drm_device *dev, unsigned long flags)
{
    struct shmob_drm_platform_data *pdata = dev->dev->platform_data;
    struct platform_device *pdev = dev->platformdev;
    struct shmob_drm_device *sdev;
    struct resource *res;
    unsigned int i;
    int ret;

    if (pdata == NULL) {
        dev_err(dev->dev, "no platform data\n");
        return -EINVAL;
    }

    sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
    if (sdev == NULL) {
        dev_err(dev->dev, "failed to allocate private data\n");
        return -ENOMEM;
    }

    sdev->dev = &pdev->dev;
    sdev->pdata = pdata;
    spin_lock_init(&sdev->irq_lock);

    sdev->ddev = dev;
    dev->dev_private = sdev;

    /* I/O resources and clocks */
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "failed to get memory resource\n");
        ret = -EINVAL;
        goto done;
    }

    sdev->mmio = ioremap_nocache(res->start, resource_size(res));
    if (sdev->mmio == NULL) {
        dev_err(&pdev->dev, "failed to remap memory resource\n");
        ret = -ENOMEM;
        goto done;
    }

    ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
    if (ret < 0)
        goto done;

    ret = shmob_drm_init_interface(sdev);
    if (ret < 0)
        goto done;

    ret = shmob_drm_modeset_init(sdev);
    if (ret < 0) {
        dev_err(&pdev->dev, "failed to initialize mode setting\n");
        goto done;
    }

    for (i = 0; i < 4; ++i) {
        ret = shmob_drm_plane_create(sdev, i);
        if (ret < 0) {
            dev_err(&pdev->dev, "failed to create plane %u\n", i);
            goto done;
        }
    }

    ret = drm_vblank_init(dev, 1);
    if (ret < 0) {
        dev_err(&pdev->dev, "failed to initialize vblank\n");
        goto done;
    }

    ret = drm_irq_install(dev);
    if (ret < 0) {
        dev_err(&pdev->dev, "failed to install IRQ handler\n");
        goto done;
    }

    platform_set_drvdata(pdev, sdev);

done:
    if (ret)
        shmob_drm_unload(dev);

    return ret;
}

static void shmob_drm_preclose(struct drm_device *dev, struct drm_file *file)
{
    struct shmob_drm_device *sdev = dev->dev_private;

    shmob_drm_crtc_cancel_page_flip(&sdev->crtc, file);
}

static irqreturn_t shmob_drm_irq(int irq, void *arg)
{
    struct drm_device *dev = arg;
    struct shmob_drm_device *sdev = dev->dev_private;
    unsigned long flags;
    u32 status;

    /* Acknowledge interrupts. Putting interrupt enable and interrupt flag
     * bits in the same register is really brain-dead design and requires
     * taking a spinlock.
     */
    spin_lock_irqsave(&sdev->irq_lock, flags);
    status = lcdc_read(sdev, LDINTR);
    lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
    spin_unlock_irqrestore(&sdev->irq_lock, flags);

    if (status & LDINTR_VES) {
        drm_handle_vblank(dev, 0);
        shmob_drm_crtc_finish_page_flip(&sdev->crtc);
    }

    return IRQ_HANDLED;
}

static int shmob_drm_enable_vblank(struct drm_device *dev, int crtc)
{
    struct shmob_drm_device *sdev = dev->dev_private;

    shmob_drm_crtc_enable_vblank(sdev, true);

    return 0;
}

static void shmob_drm_disable_vblank(struct drm_device *dev, int crtc)
{
    struct shmob_drm_device *sdev = dev->dev_private;

    shmob_drm_crtc_enable_vblank(sdev, false);
}

static const struct file_operations shmob_drm_fops = {
    .owner      = THIS_MODULE,
    .open       = drm_open,
    .release    = drm_release,
    .unlocked_ioctl = drm_ioctl,
#ifdef CONFIG_COMPAT
    .compat_ioctl   = drm_compat_ioctl,
#endif
    .poll       = drm_poll,
    .read       = drm_read,
    .fasync     = drm_fasync,
    .llseek     = no_llseek,
    .mmap       = drm_gem_cma_mmap,
};

static struct drm_driver shmob_drm_driver = {
    .driver_features    = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
    .load           = shmob_drm_load,
    .unload         = shmob_drm_unload,
    .preclose       = shmob_drm_preclose,
    .irq_handler        = shmob_drm_irq,
    .get_vblank_counter = drm_vblank_count,
    .enable_vblank      = shmob_drm_enable_vblank,
    .disable_vblank     = shmob_drm_disable_vblank,
    .gem_free_object    = drm_gem_cma_free_object,
    .gem_vm_ops     = &drm_gem_cma_vm_ops,
    .dumb_create        = drm_gem_cma_dumb_create,
    .dumb_map_offset    = drm_gem_cma_dumb_map_offset,
    .dumb_destroy       = drm_gem_cma_dumb_destroy,
    .fops           = &shmob_drm_fops,
    .name           = "shmob-drm",
    .desc           = "Renesas SH Mobile DRM",
    .date           = "20120424",
    .major          = 1,
    .minor          = 0,
};

/* -----------------------------------------------------------------------------
 * Power management
 */

#if CONFIG_PM_SLEEP
static int shmob_drm_pm_suspend(struct device *dev)
{
    struct shmob_drm_device *sdev = dev_get_drvdata(dev);

    drm_kms_helper_poll_disable(sdev->ddev);
    shmob_drm_crtc_suspend(&sdev->crtc);

    return 0;
}

static int shmob_drm_pm_resume(struct device *dev)
{
    struct shmob_drm_device *sdev = dev_get_drvdata(dev);

    mutex_lock(&sdev->ddev->mode_config.mutex);
    shmob_drm_crtc_resume(&sdev->crtc);
    mutex_unlock(&sdev->ddev->mode_config.mutex);

    drm_kms_helper_poll_enable(sdev->ddev);
    return 0;
}
#endif

static const struct dev_pm_ops shmob_drm_pm_ops = {
    SET_SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
};

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

static int __devinit shmob_drm_probe(struct platform_device *pdev)
{
    return drm_platform_init(&shmob_drm_driver, pdev);
}

static int __devexit shmob_drm_remove(struct platform_device *pdev)
{
    drm_platform_exit(&shmob_drm_driver, pdev);

    return 0;
}

static struct platform_driver shmob_drm_platform_driver = {
    .probe      = shmob_drm_probe,
    .remove     = __devexit_p(shmob_drm_remove),
    .driver     = {
        .owner  = THIS_MODULE,
        .name   = "shmob-drm",
        .pm = &shmob_drm_pm_ops,
    },
};

module_platform_driver(shmob_drm_platform_driver);

MODULE_AUTHOR("Laurent Pinchart <[email protected]>");
MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
MODULE_LICENSE("GPL");