ipuv3-crtc.c

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/*
 * i.MX IPUv3 Graphics driver
 *
 * Copyright (C) 2011 Sascha Hauer, Pengutronix
 *
 * 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.
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */
#include <linux/module.h>
#include <linux/export.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <drm/drmP.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <linux/fb.h>
#include <linux/clk.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>

#include "ipu-v3/imx-ipu-v3.h"
#include "imx-drm.h"

#define DRIVER_DESC     "i.MX IPUv3 Graphics"

struct ipu_framebuffer {
    struct drm_framebuffer  base;
    void            *virt;
    dma_addr_t      phys;
    size_t          len;
};

struct ipu_crtc {
    struct drm_fb_helper    fb_helper;
    struct ipu_framebuffer  ifb;
    int         num_crtcs;
    struct device       *dev;
    struct drm_crtc     base;
    struct imx_drm_crtc *imx_crtc;
    struct ipuv3_channel    *ipu_ch;
    struct ipu_dc       *dc;
    struct ipu_dp       *dp;
    struct dmfc_channel *dmfc;
    struct ipu_di       *di;
    int         enabled;
    struct ipu_priv     *ipu_priv;
    struct drm_pending_vblank_event *page_flip_event;
    struct drm_framebuffer  *newfb;
    int         irq;
    u32         interface_pix_fmt;
    unsigned long       di_clkflags;
};

#define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)

static int calc_vref(struct drm_display_mode *mode)
{
    unsigned long htotal, vtotal;

    htotal = mode->htotal;
    vtotal = mode->vtotal;

    if (!htotal || !vtotal)
        return 60;

    return mode->clock * 1000 / vtotal / htotal;
}

static int calc_bandwidth(struct drm_display_mode *mode, unsigned int vref)
{
    return mode->hdisplay * mode->vdisplay * vref;
}

static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
{
    if (ipu_crtc->enabled)
        return;

    ipu_di_enable(ipu_crtc->di);
    ipu_dmfc_enable_channel(ipu_crtc->dmfc);
    ipu_idmac_enable_channel(ipu_crtc->ipu_ch);
    ipu_dc_enable_channel(ipu_crtc->dc);
    if (ipu_crtc->dp)
        ipu_dp_enable_channel(ipu_crtc->dp);

    ipu_crtc->enabled = 1;
}

static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
{
    if (!ipu_crtc->enabled)
        return;

    if (ipu_crtc->dp)
        ipu_dp_disable_channel(ipu_crtc->dp);
    ipu_dc_disable_channel(ipu_crtc->dc);
    ipu_idmac_disable_channel(ipu_crtc->ipu_ch);
    ipu_dmfc_disable_channel(ipu_crtc->dmfc);
    ipu_di_disable(ipu_crtc->di);

    ipu_crtc->enabled = 0;
}

static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

    dev_info(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);

    switch (mode) {
    case DRM_MODE_DPMS_ON:
        ipu_fb_enable(ipu_crtc);
        break;
    case DRM_MODE_DPMS_STANDBY:
    case DRM_MODE_DPMS_SUSPEND:
    case DRM_MODE_DPMS_OFF:
        ipu_fb_disable(ipu_crtc);
        break;
    }
}

static int ipu_page_flip(struct drm_crtc *crtc,
        struct drm_framebuffer *fb,
        struct drm_pending_vblank_event *event)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
    int ret;

    if (ipu_crtc->newfb)
        return -EBUSY;

    ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
    if (ret) {
        dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
        list_del(&event->base.link);

        return ret;
    }

    ipu_crtc->newfb = fb;
    ipu_crtc->page_flip_event = event;

    return 0;
}

static const struct drm_crtc_funcs ipu_crtc_funcs = {
    .set_config = drm_crtc_helper_set_config,
    .destroy = drm_crtc_cleanup,
    .page_flip = ipu_page_flip,
};

static int ipu_drm_set_base(struct drm_crtc *crtc, int x, int y)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
    struct drm_gem_cma_object *cma_obj;
    struct drm_framebuffer *fb = crtc->fb;
    unsigned long phys;

    cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
    if (!cma_obj) {
        DRM_LOG_KMS("entry is null.\n");
        return -EFAULT;
    }

    phys = cma_obj->paddr;
    phys += x * (fb->bits_per_pixel >> 3);
    phys += y * fb->pitches[0];

    dev_dbg(ipu_crtc->dev, "%s: phys: 0x%lx\n", __func__, phys);
    dev_dbg(ipu_crtc->dev, "%s: xy: %dx%d\n", __func__, x, y);

    ipu_cpmem_set_stride(ipu_get_cpmem(ipu_crtc->ipu_ch), fb->pitches[0]);
    ipu_cpmem_set_buffer(ipu_get_cpmem(ipu_crtc->ipu_ch),
              0, phys);

    return 0;
}

static int ipu_crtc_mode_set(struct drm_crtc *crtc,
                   struct drm_display_mode *orig_mode,
                   struct drm_display_mode *mode,
                   int x, int y,
                   struct drm_framebuffer *old_fb)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
    struct drm_framebuffer *fb = ipu_crtc->base.fb;
    int ret;
    struct ipu_di_signal_cfg sig_cfg = {};
    u32 out_pixel_fmt;
    struct ipu_ch_param __iomem *cpmem = ipu_get_cpmem(ipu_crtc->ipu_ch);
    int bpp;
    u32 v4l2_fmt;

    dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
            mode->hdisplay);
    dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
            mode->vdisplay);

    ipu_ch_param_zero(cpmem);

    switch (fb->pixel_format) {
    case DRM_FORMAT_XRGB8888:
    case DRM_FORMAT_ARGB8888:
        v4l2_fmt = V4L2_PIX_FMT_RGB32;
        bpp = 32;
        break;
    case DRM_FORMAT_RGB565:
        v4l2_fmt = V4L2_PIX_FMT_RGB565;
        bpp = 16;
        break;
    case DRM_FORMAT_RGB888:
        v4l2_fmt = V4L2_PIX_FMT_RGB24;
        bpp = 24;
        break;
    default:
        dev_err(ipu_crtc->dev, "unsupported pixel format 0x%08x\n",
                fb->pixel_format);
        return -EINVAL;
    }

    out_pixel_fmt = ipu_crtc->interface_pix_fmt;

    if (mode->flags & DRM_MODE_FLAG_INTERLACE)
        sig_cfg.interlaced = 1;
    if (mode->flags & DRM_MODE_FLAG_PHSYNC)
        sig_cfg.Hsync_pol = 1;
    if (mode->flags & DRM_MODE_FLAG_PVSYNC)
        sig_cfg.Vsync_pol = 1;

    sig_cfg.enable_pol = 1;
    sig_cfg.clk_pol = 0;
    sig_cfg.width = mode->hdisplay;
    sig_cfg.height = mode->vdisplay;
    sig_cfg.pixel_fmt = out_pixel_fmt;
    sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
    sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
    sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;

    sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
    sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
    sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
    sig_cfg.pixelclock = mode->clock * 1000;
    sig_cfg.clkflags = ipu_crtc->di_clkflags;

    sig_cfg.v_to_h_sync = 0;

    if (ipu_crtc->dp) {
        ret = ipu_dp_setup_channel(ipu_crtc->dp, IPUV3_COLORSPACE_RGB,
                IPUV3_COLORSPACE_RGB);
        if (ret) {
            dev_err(ipu_crtc->dev,
                "initializing display processor failed with %d\n",
                ret);
            return ret;
        }
        ipu_dp_set_global_alpha(ipu_crtc->dp, 1, 0, 1);
    }

    ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
            out_pixel_fmt, mode->hdisplay);
    if (ret) {
        dev_err(ipu_crtc->dev,
                "initializing display controller failed with %d\n",
                ret);
        return ret;
    }

    ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
    if (ret) {
        dev_err(ipu_crtc->dev,
                "initializing panel failed with %d\n", ret);
        return ret;
    }

    ipu_cpmem_set_resolution(cpmem, mode->hdisplay, mode->vdisplay);
    ipu_cpmem_set_fmt(cpmem, v4l2_fmt);
    ipu_cpmem_set_high_priority(ipu_crtc->ipu_ch);

    ret = ipu_dmfc_init_channel(ipu_crtc->dmfc, mode->hdisplay);
    if (ret) {
        dev_err(ipu_crtc->dev,
                "initializing dmfc channel failed with %d\n",
                ret);
        return ret;
    }

    ret = ipu_dmfc_alloc_bandwidth(ipu_crtc->dmfc,
            calc_bandwidth(mode, calc_vref(mode)), 64);
    if (ret) {
        dev_err(ipu_crtc->dev,
                "allocating dmfc bandwidth failed with %d\n",
                ret);
        return ret;
    }

    ipu_drm_set_base(crtc, x, y);

    return 0;
}

static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
{
    struct drm_pending_vblank_event *e;
    struct timeval now;
    unsigned long flags;
    struct drm_device *drm = ipu_crtc->base.dev;

    spin_lock_irqsave(&drm->event_lock, flags);

    e = ipu_crtc->page_flip_event;
    if (!e) {
        spin_unlock_irqrestore(&drm->event_lock, flags);
        return;
    }

    do_gettimeofday(&now);
    e->event.sequence = 0;
    e->event.tv_sec = now.tv_sec;
    e->event.tv_usec = now.tv_usec;
    ipu_crtc->page_flip_event = NULL;

    imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);

    list_add_tail(&e->base.link, &e->base.file_priv->event_list);

    wake_up_interruptible(&e->base.file_priv->event_wait);

    spin_unlock_irqrestore(&drm->event_lock, flags);
}

static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
{
    struct ipu_crtc *ipu_crtc = dev_id;

    imx_drm_handle_vblank(ipu_crtc->imx_crtc);

    if (ipu_crtc->newfb) {
        ipu_crtc->base.fb = ipu_crtc->newfb;
        ipu_crtc->newfb = NULL;
        ipu_drm_set_base(&ipu_crtc->base, 0, 0);
        ipu_crtc_handle_pageflip(ipu_crtc);
    }

    return IRQ_HANDLED;
}

static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
                  const struct drm_display_mode *mode,
                  struct drm_display_mode *adjusted_mode)
{
    return true;
}

static void ipu_crtc_prepare(struct drm_crtc *crtc)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

    ipu_fb_disable(ipu_crtc);
}

static void ipu_crtc_commit(struct drm_crtc *crtc)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

    ipu_fb_enable(ipu_crtc);
}

static void ipu_crtc_load_lut(struct drm_crtc *crtc)
{
}

static struct drm_crtc_helper_funcs ipu_helper_funcs = {
    .dpms = ipu_crtc_dpms,
    .mode_fixup = ipu_crtc_mode_fixup,
    .mode_set = ipu_crtc_mode_set,
    .prepare = ipu_crtc_prepare,
    .commit = ipu_crtc_commit,
    .load_lut = ipu_crtc_load_lut,
};

static int ipu_enable_vblank(struct drm_crtc *crtc)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

    enable_irq(ipu_crtc->irq);

    return 0;
}

static void ipu_disable_vblank(struct drm_crtc *crtc)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

    disable_irq(ipu_crtc->irq);
}

static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
        u32 pixfmt)
{
    struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);

    ipu_crtc->interface_pix_fmt = pixfmt;

    switch (encoder_type) {
    case DRM_MODE_ENCODER_LVDS:
        ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
            IPU_DI_CLKMODE_EXT;
        break;
    case DRM_MODE_ENCODER_NONE:
        ipu_crtc->di_clkflags = 0;
        break;
    }

    return 0;
}

static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
    .enable_vblank = ipu_enable_vblank,
    .disable_vblank = ipu_disable_vblank,
    .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
    .crtc_funcs = &ipu_crtc_funcs,
    .crtc_helper_funcs = &ipu_helper_funcs,
};

static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
{
    if (!IS_ERR_OR_NULL(ipu_crtc->ipu_ch))
        ipu_idmac_put(ipu_crtc->ipu_ch);
    if (!IS_ERR_OR_NULL(ipu_crtc->dmfc))
        ipu_dmfc_put(ipu_crtc->dmfc);
    if (!IS_ERR_OR_NULL(ipu_crtc->dp))
        ipu_dp_put(ipu_crtc->dp);
    if (!IS_ERR_OR_NULL(ipu_crtc->di))
        ipu_di_put(ipu_crtc->di);
}

static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
        struct ipu_client_platformdata *pdata)
{
    struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
    int ret;

    ipu_crtc->ipu_ch = ipu_idmac_get(ipu, pdata->dma[0]);
    if (IS_ERR_OR_NULL(ipu_crtc->ipu_ch)) {
        ret = PTR_ERR(ipu_crtc->ipu_ch);
        goto err_out;
    }

    ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
    if (IS_ERR(ipu_crtc->dc)) {
        ret = PTR_ERR(ipu_crtc->dc);
        goto err_out;
    }

    ipu_crtc->dmfc = ipu_dmfc_get(ipu, pdata->dma[0]);
    if (IS_ERR(ipu_crtc->dmfc)) {
        ret = PTR_ERR(ipu_crtc->dmfc);
        goto err_out;
    }

    if (pdata->dp >= 0) {
        ipu_crtc->dp = ipu_dp_get(ipu, pdata->dp);
        if (IS_ERR(ipu_crtc->dp)) {
            ret = PTR_ERR(ipu_crtc->ipu_ch);
            goto err_out;
        }
    }

    ipu_crtc->di = ipu_di_get(ipu, pdata->di);
    if (IS_ERR(ipu_crtc->di)) {
        ret = PTR_ERR(ipu_crtc->di);
        goto err_out;
    }

    ipu_crtc->irq = ipu_idmac_channel_irq(ipu, ipu_crtc->ipu_ch,
            IPU_IRQ_EOF);
    ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
            "imx_drm", ipu_crtc);
    if (ret < 0) {
        dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
        goto err_out;
    }

    disable_irq(ipu_crtc->irq);

    return 0;
err_out:
    ipu_put_resources(ipu_crtc);

    return ret;
}

static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
        struct ipu_client_platformdata *pdata)
{
    int ret;

    ret = ipu_get_resources(ipu_crtc, pdata);
    if (ret) {
        dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
                ret);
        return ret;
    }

    ret = imx_drm_add_crtc(&ipu_crtc->base,
            &ipu_crtc->imx_crtc,
            &ipu_crtc_helper_funcs, THIS_MODULE,
            ipu_crtc->dev->parent->of_node, pdata->di);
    if (ret) {
        dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
        goto err_put_resources;
    }

    return 0;

err_put_resources:
    ipu_put_resources(ipu_crtc);

    return ret;
}

static int __devinit ipu_drm_probe(struct platform_device *pdev)
{
    struct ipu_client_platformdata *pdata = pdev->dev.platform_data;
    struct ipu_crtc *ipu_crtc;
    int ret;

    if (!pdata)
        return -EINVAL;

    pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

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

    ipu_crtc->dev = &pdev->dev;

    ret = ipu_crtc_init(ipu_crtc, pdata);

    platform_set_drvdata(pdev, ipu_crtc);

    return 0;
}

static int __devexit ipu_drm_remove(struct platform_device *pdev)
{
    struct ipu_crtc *ipu_crtc = platform_get_drvdata(pdev);

    imx_drm_remove_crtc(ipu_crtc->imx_crtc);

    ipu_put_resources(ipu_crtc);

    return 0;
}

static struct platform_driver ipu_drm_driver = {
    .driver = {
        .name = "imx-ipuv3-crtc",
    },
    .probe = ipu_drm_probe,
    .remove = __devexit_p(ipu_drm_remove),
};
module_platform_driver(ipu_drm_driver);

MODULE_AUTHOR("Sascha Hauer <[email protected]>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");