/*
 * Copyright 2013 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.
 *
 * Authors: Dave Airlie
 *          Alon Levy
 */

#include "qxl_drv.h"
#include "qxl_object.h"

#include <linux/io-mapping.h>

int qxl_log_level;

static void qxl_dump_mode(struct qxl_device *qdev, void *p)
{
        struct qxl_mode *m = p;
        DRM_DEBUG_KMS("%d: %dx%d %d bits, stride %d, %dmm x %dmm, orientation %d\n",
                      m->id, m->x_res, m->y_res, m->bits, m->stride, m->x_mili,
                      m->y_mili, m->orientation);
}

static bool qxl_check_device(struct qxl_device *qdev)
{
        struct qxl_rom *rom = qdev->rom;
        int mode_offset;
        int i;

        if (rom->magic != 0x4f525851) {
                DRM_ERROR("bad rom signature %x\n", rom->magic);
                return false;
        }

        DRM_INFO("Device Version %d.%d\n", rom->id, rom->update_id);
        DRM_INFO("Compression level %d log level %d\n", rom->compression_level,
                 rom->log_level);
        DRM_INFO("Currently using mode #%d, list at 0x%x\n",
                 rom->mode, rom->modes_offset);
        DRM_INFO("%d io pages at offset 0x%x\n",
                 rom->num_io_pages, rom->pages_offset);
        DRM_INFO("%d byte draw area at offset 0x%x\n",
                 rom->surface0_area_size, rom->draw_area_offset);

        qdev->vram_size = rom->surface0_area_size;
        DRM_INFO("RAM header offset: 0x%x\n", rom->ram_header_offset);

        mode_offset = rom->modes_offset / 4;
        qdev->mode_info.num_modes = ((u32 *)rom)[mode_offset];
        DRM_INFO("rom modes offset 0x%x for %d modes\n", rom->modes_offset,
                 qdev->mode_info.num_modes);
        qdev->mode_info.modes = (void *)((uint32_t *)rom + mode_offset + 1);
        for (i = 0; i < qdev->mode_info.num_modes; i++)
                qxl_dump_mode(qdev, qdev->mode_info.modes + i);
        return true;
}

static uint8_t setup_slot(struct qxl_device *qdev, uint8_t slot_index_offset,
        unsigned long start_phys_addr, unsigned long end_phys_addr)
{
        uint64_t high_bits;
        struct qxl_memslot *slot;
        uint8_t slot_index;
        struct qxl_ram_header *ram_header = qdev->ram_header;

        slot_index = qdev->rom->slots_start + slot_index_offset;
        slot = &qdev->mem_slots[slot_index];
        slot->start_phys_addr = start_phys_addr;
        slot->end_phys_addr = end_phys_addr;
        ram_header->mem_slot.mem_start = slot->start_phys_addr;
        ram_header->mem_slot.mem_end = slot->end_phys_addr;
        qxl_io_memslot_add(qdev, slot_index);
        slot->generation = qdev->rom->slot_generation;
        high_bits = slot_index << qdev->slot_gen_bits;
        high_bits |= slot->generation;
        high_bits <<= (64 - (qdev->slot_gen_bits + qdev->slot_id_bits));
        slot->high_bits = high_bits;
        return slot_index;
}

static void qxl_gc_work(struct work_struct *work)
{
        struct qxl_device *qdev = container_of(work, struct qxl_device, gc_work);
        qxl_garbage_collect(qdev);
}

int qxl_device_init(struct qxl_device *qdev,
                    struct drm_device *ddev,
                    struct pci_dev *pdev,
                    unsigned long flags)
{
        int r;

        qdev->dev = &pdev->dev;
        qdev->ddev = ddev;
        qdev->pdev = pdev;
        qdev->flags = flags;

        mutex_init(&qdev->gem.mutex);
        mutex_init(&qdev->update_area_mutex);
        mutex_init(&qdev->release_mutex);
        mutex_init(&qdev->surf_evict_mutex);
        INIT_LIST_HEAD(&qdev->gem.objects);

        qdev->rom_base = pci_resource_start(pdev, 2);
        qdev->rom_size = pci_resource_len(pdev, 2);
        qdev->vram_base = pci_resource_start(pdev, 0);
        qdev->surfaceram_base = pci_resource_start(pdev, 1);
        qdev->surfaceram_size = pci_resource_len(pdev, 1);
        qdev->io_base = pci_resource_start(pdev, 3);

        qdev->vram_mapping = io_mapping_create_wc(qdev->vram_base, pci_resource_len(pdev, 0));
        qdev->surface_mapping = io_mapping_create_wc(qdev->surfaceram_base, qdev->surfaceram_size);
        DRM_DEBUG_KMS("qxl: vram %llx-%llx(%dM %dk), surface %llx-%llx(%dM %dk)\n",
                 (unsigned long long)qdev->vram_base,
                 (unsigned long long)pci_resource_end(pdev, 0),
                 (int)pci_resource_len(pdev, 0) / 1024 / 1024,
                 (int)pci_resource_len(pdev, 0) / 1024,
                 (unsigned long long)qdev->surfaceram_base,
                 (unsigned long long)pci_resource_end(pdev, 1),
                 (int)qdev->surfaceram_size / 1024 / 1024,
                 (int)qdev->surfaceram_size / 1024);

        qdev->rom = ioremap(qdev->rom_base, qdev->rom_size);
        if (!qdev->rom) {
                pr_err("Unable to ioremap ROM\n");
                return -ENOMEM;
        }

        qxl_check_device(qdev);

        r = qxl_bo_init(qdev);
        if (r) {
                DRM_ERROR("bo init failed %d\n", r);
                return r;
        }

        qdev->ram_header = ioremap(qdev->vram_base +
                                   qdev->rom->ram_header_offset,
                                   sizeof(*qdev->ram_header));

        qdev->command_ring = qxl_ring_create(&(qdev->ram_header->cmd_ring_hdr),
                                             sizeof(struct qxl_command),
                                             QXL_COMMAND_RING_SIZE,
                                             qdev->io_base + QXL_IO_NOTIFY_CMD,
                                             false,
                                             &qdev->display_event);

        qdev->cursor_ring = qxl_ring_create(
                                &(qdev->ram_header->cursor_ring_hdr),
                                sizeof(struct qxl_command),
                                QXL_CURSOR_RING_SIZE,
                                qdev->io_base + QXL_IO_NOTIFY_CMD,
                                false,
                                &qdev->cursor_event);

        qdev->release_ring = qxl_ring_create(
                                &(qdev->ram_header->release_ring_hdr),
                                sizeof(uint64_t),
                                QXL_RELEASE_RING_SIZE, 0, true,
                                NULL);

        /* TODO - slot initialization should happen on reset. where is our
         * reset handler? */
        qdev->n_mem_slots = qdev->rom->slots_end;
        qdev->slot_gen_bits = qdev->rom->slot_gen_bits;
        qdev->slot_id_bits = qdev->rom->slot_id_bits;
        qdev->va_slot_mask =
                (~(uint64_t)0) >> (qdev->slot_id_bits + qdev->slot_gen_bits);

        qdev->mem_slots =
                kmalloc(qdev->n_mem_slots * sizeof(struct qxl_memslot),
                        GFP_KERNEL);

        idr_init(&qdev->release_idr);
        spin_lock_init(&qdev->release_idr_lock);

        idr_init(&qdev->surf_id_idr);
        spin_lock_init(&qdev->surf_id_idr_lock);

        mutex_init(&qdev->async_io_mutex);

        /* reset the device into a known state - no memslots, no primary
         * created, no surfaces. */
        qxl_io_reset(qdev);

        /* must initialize irq before first async io - slot creation */
        r = qxl_irq_init(qdev);
        if (r)
                return r;

        /*
         * Note that virtual is surface0. We rely on the single ioremap done
         * before.
         */
        qdev->main_mem_slot = setup_slot(qdev, 0,
                (unsigned long)qdev->vram_base,
                (unsigned long)qdev->vram_base + qdev->rom->ram_header_offset);
        qdev->surfaces_mem_slot = setup_slot(qdev, 1,
                (unsigned long)qdev->surfaceram_base,
                (unsigned long)qdev->surfaceram_base + qdev->surfaceram_size);
        DRM_INFO("main mem slot %d [%lx,%x)\n",
                qdev->main_mem_slot,
                (unsigned long)qdev->vram_base, qdev->rom->ram_header_offset);


        qdev->gc_queue = create_singlethread_workqueue("qxl_gc");
        INIT_WORK(&qdev->gc_work, qxl_gc_work);

        r = qxl_fb_init(qdev);
        if (r)
                return r;

        return 0;
}

static void qxl_device_fini(struct qxl_device *qdev)
{
        if (qdev->current_release_bo[0])
                qxl_bo_unref(&qdev->current_release_bo[0]);
        if (qdev->current_release_bo[1])
                qxl_bo_unref(&qdev->current_release_bo[1]);
        flush_workqueue(qdev->gc_queue);
        destroy_workqueue(qdev->gc_queue);
        qdev->gc_queue = NULL;

        qxl_ring_free(qdev->command_ring);
        qxl_ring_free(qdev->cursor_ring);
        qxl_ring_free(qdev->release_ring);
        qxl_bo_fini(qdev);
        io_mapping_free(qdev->surface_mapping);
        io_mapping_free(qdev->vram_mapping);
        iounmap(qdev->ram_header);
        iounmap(qdev->rom);
        qdev->rom = NULL;
        qdev->mode_info.modes = NULL;
        qdev->mode_info.num_modes = 0;
        qxl_debugfs_remove_files(qdev);
}

int qxl_driver_unload(struct drm_device *dev)
{
        struct qxl_device *qdev = dev->dev_private;

        if (qdev == NULL)
                return 0;
        qxl_modeset_fini(qdev);
        qxl_device_fini(qdev);

        kfree(qdev);
        dev->dev_private = NULL;
        return 0;
}

int qxl_driver_load(struct drm_device *dev, unsigned long flags)
{
        struct qxl_device *qdev;
        int r;

        /* require kms */
        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -ENODEV;

        qdev = kzalloc(sizeof(struct qxl_device), GFP_KERNEL);
        if (qdev == NULL)
                return -ENOMEM;

        dev->dev_private = qdev;

        r = qxl_device_init(qdev, dev, dev->pdev, flags);
        if (r)
                goto out;

        r = qxl_modeset_init(qdev);
        if (r) {
                qxl_driver_unload(dev);
                goto out;
        }

        return 0;
out:
        kfree(qdev);
        return r;
}