mgag200_main.c

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/*
 * Copyright 2010 Matt Turner.
 * Copyright 2012 Red Hat
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License version 2. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Authors: Matthew Garrett
 *          Matt Turner
 *          Dave Airlie
 */
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include "mgag200_drv.h"

static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
    struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
    if (mga_fb->obj)
        drm_gem_object_unreference_unlocked(mga_fb->obj);
    drm_framebuffer_cleanup(fb);
    kfree(fb);
}

static int mga_user_framebuffer_create_handle(struct drm_framebuffer *fb,
                         struct drm_file *file_priv,
                         unsigned int *handle)
{
    return 0;
}

static const struct drm_framebuffer_funcs mga_fb_funcs = {
    .destroy = mga_user_framebuffer_destroy,
    .create_handle = mga_user_framebuffer_create_handle,
};

int mgag200_framebuffer_init(struct drm_device *dev,
                 struct mga_framebuffer *gfb,
                 struct drm_mode_fb_cmd2 *mode_cmd,
                 struct drm_gem_object *obj)
{
    int ret = drm_framebuffer_init(dev, &gfb->base, &mga_fb_funcs);
    if (ret) {
        DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
        return ret;
    }
    drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
    gfb->obj = obj;
    return 0;
}

static struct drm_framebuffer *
mgag200_user_framebuffer_create(struct drm_device *dev,
                struct drm_file *filp,
                struct drm_mode_fb_cmd2 *mode_cmd)
{
    struct drm_gem_object *obj;
    struct mga_framebuffer *mga_fb;
    int ret;

    obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
    if (obj == NULL)
        return ERR_PTR(-ENOENT);

    mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
    if (!mga_fb) {
        drm_gem_object_unreference_unlocked(obj);
        return ERR_PTR(-ENOMEM);
    }

    ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
    if (ret) {
        drm_gem_object_unreference_unlocked(obj);
        kfree(mga_fb);
        return ERR_PTR(ret);
    }
    return &mga_fb->base;
}

static const struct drm_mode_config_funcs mga_mode_funcs = {
    .fb_create = mgag200_user_framebuffer_create,
};

/* Unmap the framebuffer from the core and release the memory */
static void mga_vram_fini(struct mga_device *mdev)
{
    pci_iounmap(mdev->dev->pdev, mdev->rmmio);
    mdev->rmmio = NULL;
    if (mdev->mc.vram_base)
        release_mem_region(mdev->mc.vram_base, mdev->mc.vram_window);
}

static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
{
    int offset;
    int orig;
    int test1, test2;
    int orig1, orig2;

    /* Probe */
    orig = ioread16(mem);
    iowrite16(0, mem);

    for (offset = 0x100000; offset < mdev->mc.vram_window; offset += 0x4000) {
        orig1 = ioread8(mem + offset);
        orig2 = ioread8(mem + offset + 0x100);

        iowrite16(0xaa55, mem + offset);
        iowrite16(0xaa55, mem + offset + 0x100);

        test1 = ioread16(mem + offset);
        test2 = ioread16(mem);

        iowrite16(orig1, mem + offset);
        iowrite16(orig2, mem + offset + 0x100);

        if (test1 != 0xaa55) {
            break;
        }

        if (test2) {
            break;
        }
    }

    iowrite16(orig, mem);
    return offset - 65536;
}

/* Map the framebuffer from the card and configure the core */
static int mga_vram_init(struct mga_device *mdev)
{
    void __iomem *mem;
    struct apertures_struct *aper = alloc_apertures(1);

    /* BAR 0 is VRAM */
    mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
    mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);

    aper->ranges[0].base = mdev->mc.vram_base;
    aper->ranges[0].size = mdev->mc.vram_window;
    aper->count = 1;

    remove_conflicting_framebuffers(aper, "mgafb", true);

    if (!request_mem_region(mdev->mc.vram_base, mdev->mc.vram_window,
                "mgadrmfb_vram")) {
        DRM_ERROR("can't reserve VRAM\n");
        return -ENXIO;
    }

    mem = pci_iomap(mdev->dev->pdev, 0, 0);

    mdev->mc.vram_size = mga_probe_vram(mdev, mem);

    pci_iounmap(mdev->dev->pdev, mem);

    return 0;
}

static int mgag200_device_init(struct drm_device *dev,
                   uint32_t flags)
{
    struct mga_device *mdev = dev->dev_private;
    int ret, option;

    mdev->type = flags;

    /* Hardcode the number of CRTCs to 1 */
    mdev->num_crtc = 1;

    pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
    mdev->has_sdram = !(option & (1 << 14));

    /* BAR 0 is the framebuffer, BAR 1 contains registers */
    mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
    mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);

    if (!request_mem_region(mdev->rmmio_base, mdev->rmmio_size,
                "mgadrmfb_mmio")) {
        DRM_ERROR("can't reserve mmio registers\n");
        return -ENOMEM;
    }

    mdev->rmmio = pci_iomap(dev->pdev, 1, 0);
    if (mdev->rmmio == NULL)
        return -ENOMEM;

    /* stash G200 SE model number for later use */
    if (IS_G200_SE(mdev))
        mdev->reg_1e24 = RREG32(0x1e24);

    ret = mga_vram_init(mdev);
    if (ret) {
        release_mem_region(mdev->rmmio_base, mdev->rmmio_size);
        return ret;
    }

    mdev->bpp_shifts[0] = 0;
    mdev->bpp_shifts[1] = 1;
    mdev->bpp_shifts[2] = 0;
    mdev->bpp_shifts[3] = 2;
    return 0;
}

void mgag200_device_fini(struct mga_device *mdev)
{
    release_mem_region(mdev->rmmio_base, mdev->rmmio_size);
    mga_vram_fini(mdev);
}

/*
 * Functions here will be called by the core once it's bound the driver to
 * a PCI device
 */


int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
{
    struct mga_device *mdev;
    int r;

    mdev = kzalloc(sizeof(struct mga_device), GFP_KERNEL);
    if (mdev == NULL)
        return -ENOMEM;
    dev->dev_private = (void *)mdev;
    mdev->dev = dev;

    r = mgag200_device_init(dev, flags);
    if (r) {
        dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
        goto out;
    }
    r = mgag200_mm_init(mdev);
    if (r)
        goto out;

    drm_mode_config_init(dev);
    dev->mode_config.funcs = (void *)&mga_mode_funcs;
    dev->mode_config.min_width = 0;
    dev->mode_config.min_height = 0;
    dev->mode_config.preferred_depth = 24;
    dev->mode_config.prefer_shadow = 1;

    r = mgag200_modeset_init(mdev);
    if (r)
        dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
out:
    if (r)
        mgag200_driver_unload(dev);
    return r;
}

int mgag200_driver_unload(struct drm_device *dev)
{
    struct mga_device *mdev = dev->dev_private;

    if (mdev == NULL)
        return 0;
    mgag200_modeset_fini(mdev);
    mgag200_fbdev_fini(mdev);
    drm_mode_config_cleanup(dev);
    mgag200_mm_fini(mdev);
    mgag200_device_fini(mdev);
    kfree(mdev);
    dev->dev_private = NULL;
    return 0;
}

int mgag200_gem_create(struct drm_device *dev,
           u32 size, bool iskernel,
           struct drm_gem_object **obj)
{
    struct mgag200_bo *astbo;
    int ret;

    *obj = NULL;

    size = roundup(size, PAGE_SIZE);
    if (size == 0)
        return -EINVAL;

    ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
    if (ret) {
        if (ret != -ERESTARTSYS)
            DRM_ERROR("failed to allocate GEM object\n");
        return ret;
    }
    *obj = &astbo->gem;
    return 0;
}

int mgag200_dumb_create(struct drm_file *file,
            struct drm_device *dev,
            struct drm_mode_create_dumb *args)
{
    int ret;
    struct drm_gem_object *gobj;
    u32 handle;

    args->pitch = args->width * ((args->bpp + 7) / 8);
    args->size = args->pitch * args->height;

    ret = mgag200_gem_create(dev, args->size, false,
                 &gobj);
    if (ret)
        return ret;

    ret = drm_gem_handle_create(file, gobj, &handle);
    drm_gem_object_unreference_unlocked(gobj);
    if (ret)
        return ret;

    args->handle = handle;
    return 0;
}

int mgag200_dumb_destroy(struct drm_file *file,
             struct drm_device *dev,
             uint32_t handle)
{
    return drm_gem_handle_delete(file, handle);
}

int mgag200_gem_init_object(struct drm_gem_object *obj)
{
    BUG();
    return 0;
}

void mgag200_bo_unref(struct mgag200_bo **bo)
{
    struct ttm_buffer_object *tbo;

    if ((*bo) == NULL)
        return;

    tbo = &((*bo)->bo);
    ttm_bo_unref(&tbo);
    if (tbo == NULL)
        *bo = NULL;

}

void mgag200_gem_free_object(struct drm_gem_object *obj)
{
    struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);

    if (!mgag200_bo)
        return;
    mgag200_bo_unref(&mgag200_bo);
}


static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
{
    return bo->bo.addr_space_offset;
}

int
mgag200_dumb_mmap_offset(struct drm_file *file,
             struct drm_device *dev,
             uint32_t handle,
             uint64_t *offset)
{
    struct drm_gem_object *obj;
    int ret;
    struct mgag200_bo *bo;

    mutex_lock(&dev->struct_mutex);
    obj = drm_gem_object_lookup(dev, file, handle);
    if (obj == NULL) {
        ret = -ENOENT;
        goto out_unlock;
    }

    bo = gem_to_mga_bo(obj);
    *offset = mgag200_bo_mmap_offset(bo);

    drm_gem_object_unreference(obj);
    ret = 0;
out_unlock:
    mutex_unlock(&dev->struct_mutex);
    return ret;

}