/*
 * Copyright 2011 Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors:
 *    Christian König <deathsimple@vodafone.de>
 */

#include <linux/firmware.h>
#include <linux/module.h>

#include <drm/drm.h>

#include "radeon.h"
#include "radeon_ucode.h"
#include "r600d.h"

/* 1 second timeout */
#define UVD_IDLE_TIMEOUT_MS     1000

/* Firmware Names */
#define FIRMWARE_R600           "radeon/R600_uvd.bin"
#define FIRMWARE_RS780          "radeon/RS780_uvd.bin"
#define FIRMWARE_RV770          "radeon/RV770_uvd.bin"
#define FIRMWARE_RV710          "radeon/RV710_uvd.bin"
#define FIRMWARE_CYPRESS        "radeon/CYPRESS_uvd.bin"
#define FIRMWARE_SUMO           "radeon/SUMO_uvd.bin"
#define FIRMWARE_TAHITI         "radeon/TAHITI_uvd.bin"
#define FIRMWARE_BONAIRE_LEGACY "radeon/BONAIRE_uvd.bin"
#define FIRMWARE_BONAIRE        "radeon/bonaire_uvd.bin"

MODULE_FIRMWARE(FIRMWARE_R600);
MODULE_FIRMWARE(FIRMWARE_RS780);
MODULE_FIRMWARE(FIRMWARE_RV770);
MODULE_FIRMWARE(FIRMWARE_RV710);
MODULE_FIRMWARE(FIRMWARE_CYPRESS);
MODULE_FIRMWARE(FIRMWARE_SUMO);
MODULE_FIRMWARE(FIRMWARE_TAHITI);
MODULE_FIRMWARE(FIRMWARE_BONAIRE_LEGACY);
MODULE_FIRMWARE(FIRMWARE_BONAIRE);

static void radeon_uvd_idle_work_handler(struct work_struct *work);

int radeon_uvd_init(struct radeon_device *rdev)
{
        unsigned long bo_size;
        const char *fw_name = NULL, *legacy_fw_name = NULL;
        int i, r;

        INIT_DELAYED_WORK(&rdev->uvd.idle_work, radeon_uvd_idle_work_handler);

        switch (rdev->family) {
        case CHIP_RV610:
        case CHIP_RV630:
        case CHIP_RV670:
        case CHIP_RV620:
        case CHIP_RV635:
                legacy_fw_name = FIRMWARE_R600;
                break;

        case CHIP_RS780:
        case CHIP_RS880:
                legacy_fw_name = FIRMWARE_RS780;
                break;

        case CHIP_RV770:
                legacy_fw_name = FIRMWARE_RV770;
                break;

        case CHIP_RV710:
        case CHIP_RV730:
        case CHIP_RV740:
                legacy_fw_name = FIRMWARE_RV710;
                break;

        case CHIP_CYPRESS:
        case CHIP_HEMLOCK:
        case CHIP_JUNIPER:
        case CHIP_REDWOOD:
        case CHIP_CEDAR:
                legacy_fw_name = FIRMWARE_CYPRESS;
                break;

        case CHIP_SUMO:
        case CHIP_SUMO2:
        case CHIP_PALM:
        case CHIP_CAYMAN:
        case CHIP_BARTS:
        case CHIP_TURKS:
        case CHIP_CAICOS:
                legacy_fw_name = FIRMWARE_SUMO;
                break;

        case CHIP_TAHITI:
        case CHIP_VERDE:
        case CHIP_PITCAIRN:
        case CHIP_ARUBA:
        case CHIP_OLAND:
                legacy_fw_name = FIRMWARE_TAHITI;
                break;

        case CHIP_BONAIRE:
        case CHIP_KABINI:
        case CHIP_KAVERI:
        case CHIP_HAWAII:
        case CHIP_MULLINS:
                legacy_fw_name = FIRMWARE_BONAIRE_LEGACY;
                fw_name = FIRMWARE_BONAIRE;
                break;

        default:
                return -EINVAL;
        }

        rdev->uvd.fw_header_present = false;
        rdev->uvd.max_handles = RADEON_DEFAULT_UVD_HANDLES;
        if (fw_name) {
                /* Let's try to load the newer firmware first */
                r = request_firmware(&rdev->uvd_fw, fw_name, rdev->dev);
                if (r) {
                        dev_err(rdev->dev, "radeon_uvd: Can't load firmware \"%s\"\n",
                                fw_name);
                } else {
                        struct common_firmware_header *hdr = (void *)rdev->uvd_fw->data;
                        unsigned version_major, version_minor, family_id;

                        r = radeon_ucode_validate(rdev->uvd_fw);
                        if (r)
                                return r;

                        rdev->uvd.fw_header_present = true;

                        family_id = (__force u32)(hdr->ucode_version) & 0xff;
                        version_major = (le32_to_cpu((__force __le32)(hdr->ucode_version))
                                                         >> 24) & 0xff;
                        version_minor = (le32_to_cpu((__force __le32)(hdr->ucode_version))
                                                         >> 8) & 0xff;
                        DRM_INFO("Found UVD firmware Version: %u.%u Family ID: %u\n",
                                 version_major, version_minor, family_id);

                        /*
                         * Limit the number of UVD handles depending on
                         * microcode major and minor versions.
                         */
                        if ((version_major >= 0x01) && (version_minor >= 0x37))
                                rdev->uvd.max_handles = RADEON_MAX_UVD_HANDLES;
                }
        }

        /*
         * In case there is only legacy firmware, or we encounter an error
         * while loading the new firmware, we fall back to loading the legacy
         * firmware now.
         */
        if (!fw_name || r) {
                r = request_firmware(&rdev->uvd_fw, legacy_fw_name, rdev->dev);
                if (r) {
                        dev_err(rdev->dev, "radeon_uvd: Can't load firmware \"%s\"\n",
                                legacy_fw_name);
                        return r;
                }
        }

        bo_size = RADEON_GPU_PAGE_ALIGN(rdev->uvd_fw->size + 8) +
                  RADEON_UVD_STACK_SIZE + RADEON_UVD_HEAP_SIZE +
                  RADEON_UVD_SESSION_SIZE * rdev->uvd.max_handles;
        r = radeon_bo_create(rdev, bo_size, PAGE_SIZE, true,
                             RADEON_GEM_DOMAIN_VRAM, 0, NULL,
                             NULL, &rdev->uvd.vcpu_bo);
        if (r) {
                dev_err(rdev->dev, "(%d) failed to allocate UVD bo\n", r);
                return r;
        }

        r = radeon_bo_reserve(rdev->uvd.vcpu_bo, false);
        if (r) {
                radeon_bo_unref(&rdev->uvd.vcpu_bo);
                dev_err(rdev->dev, "(%d) failed to reserve UVD bo\n", r);
                return r;
        }

        r = radeon_bo_pin(rdev->uvd.vcpu_bo, RADEON_GEM_DOMAIN_VRAM,
                          &rdev->uvd.gpu_addr);
        if (r) {
                radeon_bo_unreserve(rdev->uvd.vcpu_bo);
                radeon_bo_unref(&rdev->uvd.vcpu_bo);
                dev_err(rdev->dev, "(%d) UVD bo pin failed\n", r);
                return r;
        }

        r = radeon_bo_kmap(rdev->uvd.vcpu_bo, &rdev->uvd.cpu_addr);
        if (r) {
                dev_err(rdev->dev, "(%d) UVD map failed\n", r);
                return r;
        }

        radeon_bo_unreserve(rdev->uvd.vcpu_bo);

        for (i = 0; i < rdev->uvd.max_handles; ++i) {
                atomic_set(&rdev->uvd.handles[i], 0);
                rdev->uvd.filp[i] = NULL;
                rdev->uvd.img_size[i] = 0;
        }

        return 0;
}

void radeon_uvd_fini(struct radeon_device *rdev)
{
        int r;

        if (rdev->uvd.vcpu_bo == NULL)
                return;

        r = radeon_bo_reserve(rdev->uvd.vcpu_bo, false);
        if (!r) {
                radeon_bo_kunmap(rdev->uvd.vcpu_bo);
                radeon_bo_unpin(rdev->uvd.vcpu_bo);
                radeon_bo_unreserve(rdev->uvd.vcpu_bo);
        }

        radeon_bo_unref(&rdev->uvd.vcpu_bo);

        radeon_ring_fini(rdev, &rdev->ring[R600_RING_TYPE_UVD_INDEX]);

        release_firmware(rdev->uvd_fw);
}

int radeon_uvd_suspend(struct radeon_device *rdev)
{
        int i, r;

        if (rdev->uvd.vcpu_bo == NULL)
                return 0;

        for (i = 0; i < rdev->uvd.max_handles; ++i) {
                uint32_t handle = atomic_read(&rdev->uvd.handles[i]);
                if (handle != 0) {
                        struct radeon_fence *fence;

                        radeon_uvd_note_usage(rdev);

                        r = radeon_uvd_get_destroy_msg(rdev,
                                R600_RING_TYPE_UVD_INDEX, handle, &fence);
                        if (r) {
                                DRM_ERROR("Error destroying UVD (%d)!\n", r);
                                continue;
                        }

                        radeon_fence_wait(fence, false);
                        radeon_fence_unref(&fence);

                        rdev->uvd.filp[i] = NULL;
                        atomic_set(&rdev->uvd.handles[i], 0);
                }
        }

        return 0;
}

int radeon_uvd_resume(struct radeon_device *rdev)
{
        unsigned size;
        void *ptr;

        if (rdev->uvd.vcpu_bo == NULL)
                return -EINVAL;

        memcpy_toio((void __iomem *)rdev->uvd.cpu_addr, rdev->uvd_fw->data, rdev->uvd_fw->size);

        size = radeon_bo_size(rdev->uvd.vcpu_bo);
        size -= rdev->uvd_fw->size;

        ptr = rdev->uvd.cpu_addr;
        ptr += rdev->uvd_fw->size;

        memset_io((void __iomem *)ptr, 0, size);

        return 0;
}

void radeon_uvd_force_into_uvd_segment(struct radeon_bo *rbo,
                                       uint32_t allowed_domains)
{
        int i;

        for (i = 0; i < rbo->placement.num_placement; ++i) {
                rbo->placements[i].fpfn = 0 >> PAGE_SHIFT;
                rbo->placements[i].lpfn = (256 * 1024 * 1024) >> PAGE_SHIFT;
        }

        /* If it must be in VRAM it must be in the first segment as well */
        if (allowed_domains == RADEON_GEM_DOMAIN_VRAM)
                return;

        /* abort if we already have more than one placement */
        if (rbo->placement.num_placement > 1)
                return;

        /* add another 256MB segment */
        rbo->placements[1] = rbo->placements[0];
        rbo->placements[1].fpfn += (256 * 1024 * 1024) >> PAGE_SHIFT;
        rbo->placements[1].lpfn += (256 * 1024 * 1024) >> PAGE_SHIFT;
        rbo->placement.num_placement++;
}

void radeon_uvd_free_handles(struct radeon_device *rdev, struct drm_file *filp)
{
        int i, r;
        for (i = 0; i < rdev->uvd.max_handles; ++i) {
                uint32_t handle = atomic_read(&rdev->uvd.handles[i]);
                if (handle != 0 && rdev->uvd.filp[i] == filp) {
                        struct radeon_fence *fence;

                        radeon_uvd_note_usage(rdev);

                        r = radeon_uvd_get_destroy_msg(rdev,
                                R600_RING_TYPE_UVD_INDEX, handle, &fence);
                        if (r) {
                                DRM_ERROR("Error destroying UVD (%d)!\n", r);
                                continue;
                        }

                        radeon_fence_wait(fence, false);
                        radeon_fence_unref(&fence);

                        rdev->uvd.filp[i] = NULL;
                        atomic_set(&rdev->uvd.handles[i], 0);
                }
        }
}

static int radeon_uvd_cs_msg_decode(uint32_t *msg, unsigned buf_sizes[])
{
        unsigned stream_type = msg[4];
        unsigned width = msg[6];
        unsigned height = msg[7];
        unsigned dpb_size = msg[9];
        unsigned pitch = msg[28];

        unsigned width_in_mb = width / 16;
        unsigned height_in_mb = ALIGN(height / 16, 2);

        unsigned image_size, tmp, min_dpb_size;

        image_size = width * height;
        image_size += image_size / 2;
        image_size = ALIGN(image_size, 1024);

        switch (stream_type) {
        case 0: /* H264 */

                /* reference picture buffer */
                min_dpb_size = image_size * 17;

                /* macroblock context buffer */
                min_dpb_size += width_in_mb * height_in_mb * 17 * 192;

                /* IT surface buffer */
                min_dpb_size += width_in_mb * height_in_mb * 32;
                break;

        case 1: /* VC1 */

                /* reference picture buffer */
                min_dpb_size = image_size * 3;

                /* CONTEXT_BUFFER */
                min_dpb_size += width_in_mb * height_in_mb * 128;

                /* IT surface buffer */
                min_dpb_size += width_in_mb * 64;

                /* DB surface buffer */
                min_dpb_size += width_in_mb * 128;

                /* BP */
                tmp = max(width_in_mb, height_in_mb);
                min_dpb_size += ALIGN(tmp * 7 * 16, 64);
                break;

        case 3: /* MPEG2 */

                /* reference picture buffer */
                min_dpb_size = image_size * 3;
                break;

        case 4: /* MPEG4 */

                /* reference picture buffer */
                min_dpb_size = image_size * 3;

                /* CM */
                min_dpb_size += width_in_mb * height_in_mb * 64;

                /* IT surface buffer */
                min_dpb_size += ALIGN(width_in_mb * height_in_mb * 32, 64);
                break;

        default:
                DRM_ERROR("UVD codec not handled %d!\n", stream_type);
                return -EINVAL;
        }

        if (width > pitch) {
                DRM_ERROR("Invalid UVD decoding target pitch!\n");
                return -EINVAL;
        }

        if (dpb_size < min_dpb_size) {
                DRM_ERROR("Invalid dpb_size in UVD message (%d / %d)!\n",
                          dpb_size, min_dpb_size);
                return -EINVAL;
        }

        buf_sizes[0x1] = dpb_size;
        buf_sizes[0x2] = image_size;
        return 0;
}

static int radeon_uvd_validate_codec(struct radeon_cs_parser *p,
                                     unsigned stream_type)
{
        switch (stream_type) {
        case 0: /* H264 */
        case 1: /* VC1 */
                /* always supported */
                return 0;

        case 3: /* MPEG2 */
        case 4: /* MPEG4 */
                /* only since UVD 3 */
                if (p->rdev->family >= CHIP_PALM)
                        return 0;

                fallthrough;
        default:
                DRM_ERROR("UVD codec not supported by hardware %d!\n",
                          stream_type);
                return -EINVAL;
        }
}

static int radeon_uvd_cs_msg(struct radeon_cs_parser *p, struct radeon_bo *bo,
                             unsigned offset, unsigned buf_sizes[])
{
        int32_t *msg, msg_type, handle;
        unsigned img_size = 0;
        void *ptr;
        int i, r;

        if (offset & 0x3F) {
                DRM_ERROR("UVD messages must be 64 byte aligned!\n");
                return -EINVAL;
        }

        r = radeon_bo_kmap(bo, &ptr);
        if (r) {
                DRM_ERROR("Failed mapping the UVD message (%d)!\n", r);
                return r;
        }

        msg = ptr + offset;

        msg_type = msg[1];
        handle = msg[2];

        if (handle == 0) {
                radeon_bo_kunmap(bo);
                DRM_ERROR("Invalid UVD handle!\n");
                return -EINVAL;
        }

        switch (msg_type) {
        case 0:
                /* it's a create msg, calc image size (width * height) */
                img_size = msg[7] * msg[8];

                r = radeon_uvd_validate_codec(p, msg[4]);
                radeon_bo_kunmap(bo);
                if (r)
                        return r;

                /* try to alloc a new handle */
                for (i = 0; i < p->rdev->uvd.max_handles; ++i) {
                        if (atomic_read(&p->rdev->uvd.handles[i]) == handle) {
                                DRM_ERROR("Handle 0x%x already in use!\n", handle);
                                return -EINVAL;
                        }

                        if (!atomic_cmpxchg(&p->rdev->uvd.handles[i], 0, handle)) {
                                p->rdev->uvd.filp[i] = p->filp;
                                p->rdev->uvd.img_size[i] = img_size;
                                return 0;
                        }
                }

                DRM_ERROR("No more free UVD handles!\n");
                return -EINVAL;

        case 1:
                /* it's a decode msg, validate codec and calc buffer sizes */
                r = radeon_uvd_validate_codec(p, msg[4]);
                if (!r)
                        r = radeon_uvd_cs_msg_decode(msg, buf_sizes);
                radeon_bo_kunmap(bo);
                if (r)
                        return r;

                /* validate the handle */
                for (i = 0; i < p->rdev->uvd.max_handles; ++i) {
                        if (atomic_read(&p->rdev->uvd.handles[i]) == handle) {
                                if (p->rdev->uvd.filp[i] != p->filp) {
                                        DRM_ERROR("UVD handle collision detected!\n");
                                        return -EINVAL;
                                }
                                return 0;
                        }
                }

                DRM_ERROR("Invalid UVD handle 0x%x!\n", handle);
                return -ENOENT;

        case 2:
                /* it's a destroy msg, free the handle */
                for (i = 0; i < p->rdev->uvd.max_handles; ++i)
                        atomic_cmpxchg(&p->rdev->uvd.handles[i], handle, 0);
                radeon_bo_kunmap(bo);
                return 0;

        default:
                DRM_ERROR("Illegal UVD message type (%d)!\n", msg_type);
        }

        radeon_bo_kunmap(bo);
        return -EINVAL;
}

static int radeon_uvd_cs_reloc(struct radeon_cs_parser *p,
                               int data0, int data1,
                               unsigned buf_sizes[], bool *has_msg_cmd)
{
        struct radeon_cs_chunk *relocs_chunk;
        struct radeon_bo_list *reloc;
        unsigned idx, cmd, offset;
        uint64_t start, end;
        int r;

        relocs_chunk = p->chunk_relocs;
        offset = radeon_get_ib_value(p, data0);
        idx = radeon_get_ib_value(p, data1);
        if (idx >= relocs_chunk->length_dw) {
                DRM_ERROR("Relocs at %d after relocations chunk end %d !\n",
                          idx, relocs_chunk->length_dw);
                return -EINVAL;
        }

        reloc = &p->relocs[(idx / 4)];
        start = reloc->gpu_offset;
        end = start + radeon_bo_size(reloc->robj);
        start += offset;

        p->ib.ptr[data0] = start & 0xFFFFFFFF;
        p->ib.ptr[data1] = start >> 32;

        cmd = radeon_get_ib_value(p, p->idx) >> 1;

        if (cmd < 0x4) {
                if (end <= start) {
                        DRM_ERROR("invalid reloc offset %X!\n", offset);
                        return -EINVAL;
                }
                if ((end - start) < buf_sizes[cmd]) {
                        DRM_ERROR("buffer (%d) to small (%d / %d)!\n", cmd,
                                  (unsigned)(end - start), buf_sizes[cmd]);
                        return -EINVAL;
                }

        } else if (cmd != 0x100) {
                DRM_ERROR("invalid UVD command %X!\n", cmd);
                return -EINVAL;
        }

        if ((start >> 28) != ((end - 1) >> 28)) {
                DRM_ERROR("reloc %llX-%llX crossing 256MB boundary!\n",
                          start, end);
                return -EINVAL;
        }

        /* TODO: is this still necessary on NI+ ? */
        if ((cmd == 0 || cmd == 0x3) &&
            (start >> 28) != (p->rdev->uvd.gpu_addr >> 28)) {
                DRM_ERROR("msg/fb buffer %llX-%llX out of 256MB segment!\n",
                          start, end);
                return -EINVAL;
        }

        if (cmd == 0) {
                if (*has_msg_cmd) {
                        DRM_ERROR("More than one message in a UVD-IB!\n");
                        return -EINVAL;
                }
                *has_msg_cmd = true;
                r = radeon_uvd_cs_msg(p, reloc->robj, offset, buf_sizes);
                if (r)
                        return r;
        } else if (!*has_msg_cmd) {
                DRM_ERROR("Message needed before other commands are send!\n");
                return -EINVAL;
        }

        return 0;
}

static int radeon_uvd_cs_reg(struct radeon_cs_parser *p,
                             struct radeon_cs_packet *pkt,
                             int *data0, int *data1,
                             unsigned buf_sizes[],
                             bool *has_msg_cmd)
{
        int i, r;

        p->idx++;
        for (i = 0; i <= pkt->count; ++i) {
                switch (pkt->reg + i*4) {
                case UVD_GPCOM_VCPU_DATA0:
                        *data0 = p->idx;
                        break;
                case UVD_GPCOM_VCPU_DATA1:
                        *data1 = p->idx;
                        break;
                case UVD_GPCOM_VCPU_CMD:
                        r = radeon_uvd_cs_reloc(p, *data0, *data1,
                                                buf_sizes, has_msg_cmd);
                        if (r)
                                return r;
                        break;
                case UVD_ENGINE_CNTL:
                case UVD_NO_OP:
                        break;
                default:
                        DRM_ERROR("Invalid reg 0x%X!\n",
                                  pkt->reg + i*4);
                        return -EINVAL;
                }
                p->idx++;
        }
        return 0;
}

int radeon_uvd_cs_parse(struct radeon_cs_parser *p)
{
        struct radeon_cs_packet pkt;
        int r, data0 = 0, data1 = 0;

        /* does the IB has a msg command */
        bool has_msg_cmd = false;

        /* minimum buffer sizes */
        unsigned buf_sizes[] = {
                [0x00000000]    =       2048,
                [0x00000001]    =       32 * 1024 * 1024,
                [0x00000002]    =       2048 * 1152 * 3,
                [0x00000003]    =       2048,
        };

        if (p->chunk_ib->length_dw % 16) {
                DRM_ERROR("UVD IB length (%d) not 16 dwords aligned!\n",
                          p->chunk_ib->length_dw);
                return -EINVAL;
        }

        if (p->chunk_relocs == NULL) {
                DRM_ERROR("No relocation chunk !\n");
                return -EINVAL;
        }


        do {
                r = radeon_cs_packet_parse(p, &pkt, p->idx);
                if (r)
                        return r;
                switch (pkt.type) {
                case RADEON_PACKET_TYPE0:
                        r = radeon_uvd_cs_reg(p, &pkt, &data0, &data1,
                                              buf_sizes, &has_msg_cmd);
                        if (r)
                                return r;
                        break;
                case RADEON_PACKET_TYPE2:
                        p->idx += pkt.count + 2;
                        break;
                default:
                        DRM_ERROR("Unknown packet type %d !\n", pkt.type);
                        return -EINVAL;
                }
        } while (p->idx < p->chunk_ib->length_dw);

        if (!has_msg_cmd) {
                DRM_ERROR("UVD-IBs need a msg command!\n");
                return -EINVAL;
        }

        return 0;
}

static int radeon_uvd_send_msg(struct radeon_device *rdev,
                               int ring, uint64_t addr,
                               struct radeon_fence **fence)
{
        struct radeon_ib ib;
        int i, r;

        r = radeon_ib_get(rdev, ring, &ib, NULL, 64);
        if (r)
                return r;

        ib.ptr[0] = PACKET0(UVD_GPCOM_VCPU_DATA0, 0);
        ib.ptr[1] = addr;
        ib.ptr[2] = PACKET0(UVD_GPCOM_VCPU_DATA1, 0);
        ib.ptr[3] = addr >> 32;
        ib.ptr[4] = PACKET0(UVD_GPCOM_VCPU_CMD, 0);
        ib.ptr[5] = 0;
        for (i = 6; i < 16; i += 2) {
                ib.ptr[i] = PACKET0(UVD_NO_OP, 0);
                ib.ptr[i+1] = 0;
        }
        ib.length_dw = 16;

        r = radeon_ib_schedule(rdev, &ib, NULL, false);

        if (fence)
                *fence = radeon_fence_ref(ib.fence);

        radeon_ib_free(rdev, &ib);
        return r;
}

/*
 * multiple fence commands without any stream commands in between can
 * crash the vcpu so just try to emmit a dummy create/destroy msg to
 * avoid this
 */
int radeon_uvd_get_create_msg(struct radeon_device *rdev, int ring,
                              uint32_t handle, struct radeon_fence **fence)
{
        /* we use the last page of the vcpu bo for the UVD message */
        uint64_t offs = radeon_bo_size(rdev->uvd.vcpu_bo) -
                RADEON_GPU_PAGE_SIZE;

        uint32_t __iomem *msg = (void __iomem *)(rdev->uvd.cpu_addr + offs);
        uint64_t addr = rdev->uvd.gpu_addr + offs;

        int r, i;

        r = radeon_bo_reserve(rdev->uvd.vcpu_bo, true);
        if (r)
                return r;

        /* stitch together an UVD create msg */
        writel((__force u32)cpu_to_le32(0x00000de4), &msg[0]);
        writel(0x0, (void __iomem *)&msg[1]);
        writel((__force u32)cpu_to_le32(handle), &msg[2]);
        writel(0x0, &msg[3]);
        writel(0x0, &msg[4]);
        writel(0x0, &msg[5]);
        writel(0x0, &msg[6]);
        writel((__force u32)cpu_to_le32(0x00000780), &msg[7]);
        writel((__force u32)cpu_to_le32(0x00000440), &msg[8]);
        writel(0x0, &msg[9]);
        writel((__force u32)cpu_to_le32(0x01b37000), &msg[10]);
        for (i = 11; i < 1024; ++i)
                writel(0x0, &msg[i]);

        r = radeon_uvd_send_msg(rdev, ring, addr, fence);
        radeon_bo_unreserve(rdev->uvd.vcpu_bo);
        return r;
}

int radeon_uvd_get_destroy_msg(struct radeon_device *rdev, int ring,
                               uint32_t handle, struct radeon_fence **fence)
{
        /* we use the last page of the vcpu bo for the UVD message */
        uint64_t offs = radeon_bo_size(rdev->uvd.vcpu_bo) -
                RADEON_GPU_PAGE_SIZE;

        uint32_t __iomem *msg = (void __iomem *)(rdev->uvd.cpu_addr + offs);
        uint64_t addr = rdev->uvd.gpu_addr + offs;

        int r, i;

        r = radeon_bo_reserve(rdev->uvd.vcpu_bo, true);
        if (r)
                return r;

        /* stitch together an UVD destroy msg */
        writel((__force u32)cpu_to_le32(0x00000de4), &msg[0]);
        writel((__force u32)cpu_to_le32(0x00000002), &msg[1]);
        writel((__force u32)cpu_to_le32(handle), &msg[2]);
        writel(0x0, &msg[3]);
        for (i = 4; i < 1024; ++i)
                writel(0x0, &msg[i]);

        r = radeon_uvd_send_msg(rdev, ring, addr, fence);
        radeon_bo_unreserve(rdev->uvd.vcpu_bo);
        return r;
}

/**
 * radeon_uvd_count_handles - count number of open streams
 *
 * @rdev: radeon_device pointer
 * @sd: number of SD streams
 * @hd: number of HD streams
 *
 * Count the number of open SD/HD streams as a hint for power mangement
 */
static void radeon_uvd_count_handles(struct radeon_device *rdev,
                                     unsigned *sd, unsigned *hd)
{
        unsigned i;

        *sd = 0;
        *hd = 0;

        for (i = 0; i < rdev->uvd.max_handles; ++i) {
                if (!atomic_read(&rdev->uvd.handles[i]))
                        continue;

                if (rdev->uvd.img_size[i] >= 720*576)
                        ++(*hd);
                else
                        ++(*sd);
        }
}

static void radeon_uvd_idle_work_handler(struct work_struct *work)
{
        struct radeon_device *rdev =
                container_of(work, struct radeon_device, uvd.idle_work.work);

        if (radeon_fence_count_emitted(rdev, R600_RING_TYPE_UVD_INDEX) == 0) {
                if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled) {
                        radeon_uvd_count_handles(rdev, &rdev->pm.dpm.sd,
                                                 &rdev->pm.dpm.hd);
                        radeon_dpm_enable_uvd(rdev, false);
                } else {
                        radeon_set_uvd_clocks(rdev, 0, 0);
                }
        } else {
                schedule_delayed_work(&rdev->uvd.idle_work,
                                      msecs_to_jiffies(UVD_IDLE_TIMEOUT_MS));
        }
}

void radeon_uvd_note_usage(struct radeon_device *rdev)
{
        bool streams_changed = false;
        bool set_clocks = !cancel_delayed_work_sync(&rdev->uvd.idle_work);
        set_clocks &= schedule_delayed_work(&rdev->uvd.idle_work,
                                            msecs_to_jiffies(UVD_IDLE_TIMEOUT_MS));

        if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled) {
                unsigned hd = 0, sd = 0;
                radeon_uvd_count_handles(rdev, &sd, &hd);
                if ((rdev->pm.dpm.sd != sd) ||
                    (rdev->pm.dpm.hd != hd)) {
                        rdev->pm.dpm.sd = sd;
                        rdev->pm.dpm.hd = hd;
                        /* disable this for now */
                        /*streams_changed = true;*/
                }
        }

        if (set_clocks || streams_changed) {
                if ((rdev->pm.pm_method == PM_METHOD_DPM) && rdev->pm.dpm_enabled) {
                        radeon_dpm_enable_uvd(rdev, true);
                } else {
                        radeon_set_uvd_clocks(rdev, 53300, 40000);
                }
        }
}

static unsigned radeon_uvd_calc_upll_post_div(unsigned vco_freq,
                                              unsigned target_freq,
                                              unsigned pd_min,
                                              unsigned pd_even)
{
        unsigned post_div = vco_freq / target_freq;

        /* adjust to post divider minimum value */
        if (post_div < pd_min)
                post_div = pd_min;

        /* we alway need a frequency less than or equal the target */
        if ((vco_freq / post_div) > target_freq)
                post_div += 1;

        /* post dividers above a certain value must be even */
        if (post_div > pd_even && post_div % 2)
                post_div += 1;

        return post_div;
}

/**
 * radeon_uvd_calc_upll_dividers - calc UPLL clock dividers
 *
 * @rdev: radeon_device pointer
 * @vclk: wanted VCLK
 * @dclk: wanted DCLK
 * @vco_min: minimum VCO frequency
 * @vco_max: maximum VCO frequency
 * @fb_factor: factor to multiply vco freq with
 * @fb_mask: limit and bitmask for feedback divider
 * @pd_min: post divider minimum
 * @pd_max: post divider maximum
 * @pd_even: post divider must be even above this value
 * @optimal_fb_div: resulting feedback divider
 * @optimal_vclk_div: resulting vclk post divider
 * @optimal_dclk_div: resulting dclk post divider
 *
 * Calculate dividers for UVDs UPLL (R6xx-SI, except APUs).
 * Returns zero on success -EINVAL on error.
 */
int radeon_uvd_calc_upll_dividers(struct radeon_device *rdev,
                                  unsigned vclk, unsigned dclk,
                                  unsigned vco_min, unsigned vco_max,
                                  unsigned fb_factor, unsigned fb_mask,
                                  unsigned pd_min, unsigned pd_max,
                                  unsigned pd_even,
                                  unsigned *optimal_fb_div,
                                  unsigned *optimal_vclk_div,
                                  unsigned *optimal_dclk_div)
{
        unsigned vco_freq, ref_freq = rdev->clock.spll.reference_freq;

        /* start off with something large */
        unsigned optimal_score = ~0;

        /* loop through vco from low to high */
        vco_min = max3(vco_min, vclk, dclk);
        for (vco_freq = vco_min; vco_freq <= vco_max; vco_freq += 100) {

                uint64_t fb_div = (uint64_t)vco_freq * fb_factor;
                unsigned vclk_div, dclk_div, score;

                do_div(fb_div, ref_freq);

                /* fb div out of range ? */
                if (fb_div > fb_mask)
                        break; /* it can oly get worse */

                fb_div &= fb_mask;

                /* calc vclk divider with current vco freq */
                vclk_div = radeon_uvd_calc_upll_post_div(vco_freq, vclk,
                                                         pd_min, pd_even);
                if (vclk_div > pd_max)
                        break; /* vco is too big, it has to stop */

                /* calc dclk divider with current vco freq */
                dclk_div = radeon_uvd_calc_upll_post_div(vco_freq, dclk,
                                                         pd_min, pd_even);
                if (dclk_div > pd_max)
                        break; /* vco is too big, it has to stop */

                /* calc score with current vco freq */
                score = vclk - (vco_freq / vclk_div) + dclk - (vco_freq / dclk_div);

                /* determine if this vco setting is better than current optimal settings */
                if (score < optimal_score) {
                        *optimal_fb_div = fb_div;
                        *optimal_vclk_div = vclk_div;
                        *optimal_dclk_div = dclk_div;
                        optimal_score = score;
                        if (optimal_score == 0)
                                break; /* it can't get better than this */
                }
        }

        /* did we found a valid setup ? */
        if (optimal_score == ~0)
                return -EINVAL;

        return 0;
}

int radeon_uvd_send_upll_ctlreq(struct radeon_device *rdev,
                                unsigned cg_upll_func_cntl)
{
        unsigned i;

        /* make sure UPLL_CTLREQ is deasserted */
        WREG32_P(cg_upll_func_cntl, 0, ~UPLL_CTLREQ_MASK);

        mdelay(10);

        /* assert UPLL_CTLREQ */
        WREG32_P(cg_upll_func_cntl, UPLL_CTLREQ_MASK, ~UPLL_CTLREQ_MASK);

        /* wait for CTLACK and CTLACK2 to get asserted */
        for (i = 0; i < 100; ++i) {
                uint32_t mask = UPLL_CTLACK_MASK | UPLL_CTLACK2_MASK;
                if ((RREG32(cg_upll_func_cntl) & mask) == mask)
                        break;
                mdelay(10);
        }

        /* deassert UPLL_CTLREQ */
        WREG32_P(cg_upll_func_cntl, 0, ~UPLL_CTLREQ_MASK);

        if (i == 100) {
                DRM_ERROR("Timeout setting UVD clocks!\n");
                return -ETIMEDOUT;
        }

        return 0;
}