/*
 * Copyright 2009 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Author: Ben Skeggs
 */

#include <drm/drm_crtc_helper.h>

#include "nouveau_drv.h"
#include "nouveau_reg.h"
#include "hw.h"
#include "nouveau_encoder.h"
#include "nouveau_connector.h"
#include "nouveau_bo.h"
#include "nouveau_gem.h"
#include "nouveau_chan.h"

#include <nvif/if0004.h>

struct nouveau_connector *
nv04_encoder_get_connector(struct nouveau_encoder *encoder)
{
        struct drm_device *dev = to_drm_encoder(encoder)->dev;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        struct nouveau_connector *nv_connector = NULL;

        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                if (connector->encoder == to_drm_encoder(encoder))
                        nv_connector = nouveau_connector(connector);
        }
        drm_connector_list_iter_end(&conn_iter);

        return nv_connector;
}

static void
nv04_display_fini(struct drm_device *dev, bool runtime, bool suspend)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nv04_display *disp = nv04_display(dev);
        struct drm_crtc *crtc;

        /* Disable flip completion events. */
        nvif_event_block(&disp->flip);

        /* Disable vblank interrupts. */
        NVWriteCRTC(dev, 0, NV_PCRTC_INTR_EN_0, 0);
        if (nv_two_heads(dev))
                NVWriteCRTC(dev, 1, NV_PCRTC_INTR_EN_0, 0);

        if (!runtime && !drm->headless)
                cancel_work_sync(&drm->hpd_work);

        if (!suspend)
                return;

        /* Un-pin FB and cursors so they'll be evicted to system memory. */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct drm_framebuffer *fb = crtc->primary->fb;
                struct nouveau_bo *nvbo;

                if (!fb || !fb->obj[0])
                        continue;
                nvbo = nouveau_gem_object(fb->obj[0]);
                nouveau_bo_unpin(nvbo);
        }

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
                if (nv_crtc->cursor.nvbo) {
                        if (nv_crtc->cursor.set_offset)
                                nouveau_bo_unmap(nv_crtc->cursor.nvbo);
                        nouveau_bo_unpin(nv_crtc->cursor.nvbo);
                }
        }
}

static int
nv04_display_init(struct drm_device *dev, bool resume, bool runtime)
{
        struct nv04_display *disp = nv04_display(dev);
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_encoder *encoder;
        struct drm_crtc *crtc;
        int ret;

        /* meh.. modeset apparently doesn't setup all the regs and depends
         * on pre-existing state, for now load the state of the card *before*
         * nouveau was loaded, and then do a modeset.
         *
         * best thing to do probably is to make save/restore routines not
         * save/restore "pre-load" state, but more general so we can save
         * on suspend too.
         */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
                nv_crtc->save(&nv_crtc->base);
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.base.head)
                encoder->enc_save(&encoder->base.base);

        /* Enable flip completion events. */
        nvif_event_allow(&disp->flip);

        if (!resume)
                return 0;

        /* Re-pin FB/cursors. */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct drm_framebuffer *fb = crtc->primary->fb;
                struct nouveau_bo *nvbo;

                if (!fb || !fb->obj[0])
                        continue;
                nvbo = nouveau_gem_object(fb->obj[0]);
                ret = nouveau_bo_pin(nvbo, NOUVEAU_GEM_DOMAIN_VRAM, true);
                if (ret)
                        NV_ERROR(drm, "Could not pin framebuffer\n");
        }

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
                if (!nv_crtc->cursor.nvbo)
                        continue;

                ret = nouveau_bo_pin(nv_crtc->cursor.nvbo,
                                     NOUVEAU_GEM_DOMAIN_VRAM, true);
                if (!ret && nv_crtc->cursor.set_offset)
                        ret = nouveau_bo_map(nv_crtc->cursor.nvbo);
                if (ret)
                        NV_ERROR(drm, "Could not pin/map cursor.\n");
        }

        /* Force CLUT to get re-loaded during modeset. */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

                nv_crtc->lut.depth = 0;
        }

        /* This should ensure we don't hit a locking problem when someone
         * wakes us up via a connector.  We should never go into suspend
         * while the display is on anyways.
         */
        if (runtime)
                return 0;

        /* Restore mode. */
        drm_helper_resume_force_mode(dev);

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);

                if (!nv_crtc->cursor.nvbo)
                        continue;

                if (nv_crtc->cursor.set_offset)
                        nv_crtc->cursor.set_offset(nv_crtc,
                                                   nv_crtc->cursor.nvbo->offset);
                nv_crtc->cursor.set_pos(nv_crtc, nv_crtc->cursor_saved_x,
                                                 nv_crtc->cursor_saved_y);
        }

        return 0;
}

static void
nv04_display_destroy(struct drm_device *dev)
{
        struct nv04_display *disp = nv04_display(dev);
        struct nouveau_encoder *encoder;
        struct nouveau_crtc *nv_crtc;

        /* Restore state */
        list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.base.head)
                encoder->enc_restore(&encoder->base.base);

        list_for_each_entry(nv_crtc, &dev->mode_config.crtc_list, base.head)
                nv_crtc->restore(&nv_crtc->base);

        nouveau_hw_save_vga_fonts(dev, 0);

        nvif_event_dtor(&disp->flip);

        nouveau_display(dev)->priv = NULL;
        vfree(disp);
}

int
nv04_display_create(struct drm_device *dev)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nvkm_i2c *i2c = nvxx_i2c(drm);
        struct dcb_table *dcb = &drm->vbios.dcb;
        struct drm_connector *connector, *ct;
        struct drm_encoder *encoder;
        struct nouveau_encoder *nv_encoder;
        struct nouveau_crtc *crtc;
        struct nv04_display *disp;
        int i, ret;

        disp = vzalloc(sizeof(*disp));
        if (!disp)
                return -ENOMEM;

        disp->drm = drm;

        nouveau_display(dev)->priv = disp;
        nouveau_display(dev)->dtor = nv04_display_destroy;
        nouveau_display(dev)->init = nv04_display_init;
        nouveau_display(dev)->fini = nv04_display_fini;

        /* Pre-nv50 doesn't support atomic, so don't expose the ioctls */
        dev->driver_features &= ~DRIVER_ATOMIC;

        /* Request page flip completion event. */
        if (drm->channel) {
                ret = nvif_event_ctor(&drm->channel->nvsw, "kmsFlip", 0, nv04_flip_complete,
                                      true, NULL, 0, &disp->flip);
                if (ret)
                        return ret;
        }

        nouveau_hw_save_vga_fonts(dev, 1);

        nv04_crtc_create(dev, 0);
        if (nv_two_heads(dev))
                nv04_crtc_create(dev, 1);

        for (i = 0; i < dcb->entries; i++) {
                struct dcb_output *dcbent = &dcb->entry[i];

                connector = nouveau_connector_create(dev, dcbent->connector);
                if (IS_ERR(connector))
                        continue;

                switch (dcbent->type) {
                case DCB_OUTPUT_ANALOG:
                        ret = nv04_dac_create(connector, dcbent);
                        break;
                case DCB_OUTPUT_LVDS:
                case DCB_OUTPUT_TMDS:
                        ret = nv04_dfp_create(connector, dcbent);
                        break;
                case DCB_OUTPUT_TV:
                        if (dcbent->location == DCB_LOC_ON_CHIP)
                                ret = nv17_tv_create(connector, dcbent);
                        else
                                ret = nv04_tv_create(connector, dcbent);
                        break;
                default:
                        NV_WARN(drm, "DCB type %d not known\n", dcbent->type);
                        continue;
                }

                if (ret)
                        continue;
        }

        list_for_each_entry_safe(connector, ct,
                                 &dev->mode_config.connector_list, head) {
                if (!connector->possible_encoders) {
                        NV_WARN(drm, "%s has no encoders, removing\n",
                                connector->name);
                        connector->funcs->destroy(connector);
                }
        }

        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
                struct nvkm_i2c_bus *bus =
                        nvkm_i2c_bus_find(i2c, nv_encoder->dcb->i2c_index);
                nv_encoder->i2c = bus ? &bus->i2c : NULL;
        }

        /* Save previous state */
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head)
                crtc->save(&crtc->base);

        list_for_each_entry(nv_encoder, &dev->mode_config.encoder_list, base.base.head)
                nv_encoder->enc_save(&nv_encoder->base.base);

        nouveau_overlay_init(dev);

        return 0;
}