manager.c

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/*
 * linux/drivers/video/omap2/dss/manager.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <[email protected]>
 *
 * Some code and ideas taken from drivers/video/omap/ driver
 * by Imre Deak.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#define DSS_SUBSYS_NAME "MANAGER"

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>

#include <video/omapdss.h>

#include "dss.h"
#include "dss_features.h"

static int num_managers;
static struct omap_overlay_manager *managers;

static inline struct omap_dss_device *dss_mgr_get_device(struct omap_overlay_manager *mgr)
{
    return mgr->output ? mgr->output->device : NULL;
}

static int dss_mgr_wait_for_vsync(struct omap_overlay_manager *mgr)
{
    unsigned long timeout = msecs_to_jiffies(500);
    struct omap_dss_device *dssdev = mgr->get_device(mgr);
    u32 irq;
    int r;

    r = dispc_runtime_get();
    if (r)
        return r;

    if (dssdev->type == OMAP_DISPLAY_TYPE_VENC)
        irq = DISPC_IRQ_EVSYNC_ODD;
    else if (dssdev->type == OMAP_DISPLAY_TYPE_HDMI)
        irq = DISPC_IRQ_EVSYNC_EVEN;
    else
        irq = dispc_mgr_get_vsync_irq(mgr->id);

    r = omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout);

    dispc_runtime_put();

    return r;
}

int dss_init_overlay_managers(struct platform_device *pdev)
{
    int i, r;

    num_managers = dss_feat_get_num_mgrs();

    managers = kzalloc(sizeof(struct omap_overlay_manager) * num_managers,
            GFP_KERNEL);

    BUG_ON(managers == NULL);

    for (i = 0; i < num_managers; ++i) {
        struct omap_overlay_manager *mgr = &managers[i];

        switch (i) {
        case 0:
            mgr->name = "lcd";
            mgr->id = OMAP_DSS_CHANNEL_LCD;
            break;
        case 1:
            mgr->name = "tv";
            mgr->id = OMAP_DSS_CHANNEL_DIGIT;
            break;
        case 2:
            mgr->name = "lcd2";
            mgr->id = OMAP_DSS_CHANNEL_LCD2;
            break;
        case 3:
            mgr->name = "lcd3";
            mgr->id = OMAP_DSS_CHANNEL_LCD3;
            break;
        }

        mgr->set_output = &dss_mgr_set_output;
        mgr->unset_output = &dss_mgr_unset_output;
        mgr->apply = &omap_dss_mgr_apply;
        mgr->set_manager_info = &dss_mgr_set_info;
        mgr->get_manager_info = &dss_mgr_get_info;
        mgr->wait_for_go = &dss_mgr_wait_for_go;
        mgr->wait_for_vsync = &dss_mgr_wait_for_vsync;
        mgr->get_device = &dss_mgr_get_device;

        mgr->caps = 0;
        mgr->supported_displays =
            dss_feat_get_supported_displays(mgr->id);
        mgr->supported_outputs =
            dss_feat_get_supported_outputs(mgr->id);

        INIT_LIST_HEAD(&mgr->overlays);

        r = dss_manager_kobj_init(mgr, pdev);
        if (r)
            DSSERR("failed to create sysfs file\n");
    }

    return 0;
}

void dss_uninit_overlay_managers(struct platform_device *pdev)
{
    int i;

    for (i = 0; i < num_managers; ++i) {
        struct omap_overlay_manager *mgr = &managers[i];
        dss_manager_kobj_uninit(mgr);
    }

    kfree(managers);
    managers = NULL;
    num_managers = 0;
}

int omap_dss_get_num_overlay_managers(void)
{
    return num_managers;
}
EXPORT_SYMBOL(omap_dss_get_num_overlay_managers);

struct omap_overlay_manager *omap_dss_get_overlay_manager(int num)
{
    if (num >= num_managers)
        return NULL;

    return &managers[num];
}
EXPORT_SYMBOL(omap_dss_get_overlay_manager);

int dss_mgr_simple_check(struct omap_overlay_manager *mgr,
        const struct omap_overlay_manager_info *info)
{
    if (dss_has_feature(FEAT_ALPHA_FIXED_ZORDER)) {
        /*
         * OMAP3 supports only graphics source transparency color key
         * and alpha blending simultaneously. See TRM 15.4.2.4.2.2
         * Alpha Mode.
         */
        if (info->partial_alpha_enabled && info->trans_enabled
            && info->trans_key_type != OMAP_DSS_COLOR_KEY_GFX_DST) {
            DSSERR("check_manager: illegal transparency key\n");
            return -EINVAL;
        }
    }

    return 0;
}

static int dss_mgr_check_zorder(struct omap_overlay_manager *mgr,
        struct omap_overlay_info **overlay_infos)
{
    struct omap_overlay *ovl1, *ovl2;
    struct omap_overlay_info *info1, *info2;

    list_for_each_entry(ovl1, &mgr->overlays, list) {
        info1 = overlay_infos[ovl1->id];

        if (info1 == NULL)
            continue;

        list_for_each_entry(ovl2, &mgr->overlays, list) {
            if (ovl1 == ovl2)
                continue;

            info2 = overlay_infos[ovl2->id];

            if (info2 == NULL)
                continue;

            if (info1->zorder == info2->zorder) {
                DSSERR("overlays %d and %d have the same "
                        "zorder %d\n",
                    ovl1->id, ovl2->id, info1->zorder);
                return -EINVAL;
            }
        }
    }

    return 0;
}

int dss_mgr_check_timings(struct omap_overlay_manager *mgr,
        const struct omap_video_timings *timings)
{
    if (!dispc_mgr_timings_ok(mgr->id, timings)) {
        DSSERR("check_manager: invalid timings\n");
        return -EINVAL;
    }

    return 0;
}

static int dss_mgr_check_lcd_config(struct omap_overlay_manager *mgr,
        const struct dss_lcd_mgr_config *config)
{
    struct dispc_clock_info cinfo = config->clock_info;
    int dl = config->video_port_width;
    bool stallmode = config->stallmode;
    bool fifohandcheck = config->fifohandcheck;

    if (cinfo.lck_div < 1 || cinfo.lck_div > 255)
        return -EINVAL;

    if (cinfo.pck_div < 1 || cinfo.pck_div > 255)
        return -EINVAL;

    if (dl != 12 && dl != 16 && dl != 18 && dl != 24)
        return -EINVAL;

    /* fifohandcheck should be used only with stallmode */
    if (stallmode == false && fifohandcheck == true)
        return -EINVAL;

    /*
     * io pad mode can be only checked by using dssdev connected to the
     * manager. Ignore checking these for now, add checks when manager
     * is capable of holding information related to the connected interface
     */

    return 0;
}

int dss_mgr_check(struct omap_overlay_manager *mgr,
        struct omap_overlay_manager_info *info,
        const struct omap_video_timings *mgr_timings,
        const struct dss_lcd_mgr_config *lcd_config,
        struct omap_overlay_info **overlay_infos)
{
    struct omap_overlay *ovl;
    int r;

    if (dss_has_feature(FEAT_ALPHA_FREE_ZORDER)) {
        r = dss_mgr_check_zorder(mgr, overlay_infos);
        if (r)
            return r;
    }

    r = dss_mgr_check_timings(mgr, mgr_timings);
    if (r)
        return r;

    r = dss_mgr_check_lcd_config(mgr, lcd_config);
    if (r)
        return r;

    list_for_each_entry(ovl, &mgr->overlays, list) {
        struct omap_overlay_info *oi;
        int r;

        oi = overlay_infos[ovl->id];

        if (oi == NULL)
            continue;

        r = dss_ovl_check(ovl, oi, mgr_timings);
        if (r)
            return r;
    }

    return 0;
}