ast_fb.c

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/*
 * Copyright 2012 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, 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: Dave Airlie <[email protected]>
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>


#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include "ast_drv.h"

static void ast_dirty_update(struct ast_fbdev *afbdev,
                 int x, int y, int width, int height)
{
    int i;
    struct drm_gem_object *obj;
    struct ast_bo *bo;
    int src_offset, dst_offset;
    int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
    int ret;
    bool unmap = false;

    obj = afbdev->afb.obj;
    bo = gem_to_ast_bo(obj);

    ret = ast_bo_reserve(bo, true);
    if (ret) {
        DRM_ERROR("failed to reserve fb bo\n");
        return;
    }

    if (!bo->kmap.virtual) {
        ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
        if (ret) {
            DRM_ERROR("failed to kmap fb updates\n");
            ast_bo_unreserve(bo);
            return;
        }
        unmap = true;
    }
    for (i = y; i < y + height; i++) {
        /* assume equal stride for now */
        src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
        memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);

    }
    if (unmap)
        ttm_bo_kunmap(&bo->kmap);

    ast_bo_unreserve(bo);
}

static void ast_fillrect(struct fb_info *info,
             const struct fb_fillrect *rect)
{
    struct ast_fbdev *afbdev = info->par;
    sys_fillrect(info, rect);
    ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
             rect->height);
}

static void ast_copyarea(struct fb_info *info,
             const struct fb_copyarea *area)
{
    struct ast_fbdev *afbdev = info->par;
    sys_copyarea(info, area);
    ast_dirty_update(afbdev, area->dx, area->dy, area->width,
             area->height);
}

static void ast_imageblit(struct fb_info *info,
              const struct fb_image *image)
{
    struct ast_fbdev *afbdev = info->par;
    sys_imageblit(info, image);
    ast_dirty_update(afbdev, image->dx, image->dy, image->width,
             image->height);
}

static struct fb_ops astfb_ops = {
    .owner = THIS_MODULE,
    .fb_check_var = drm_fb_helper_check_var,
    .fb_set_par = drm_fb_helper_set_par,
    .fb_fillrect = ast_fillrect,
    .fb_copyarea = ast_copyarea,
    .fb_imageblit = ast_imageblit,
    .fb_pan_display = drm_fb_helper_pan_display,
    .fb_blank = drm_fb_helper_blank,
    .fb_setcmap = drm_fb_helper_setcmap,
    .fb_debug_enter = drm_fb_helper_debug_enter,
    .fb_debug_leave = drm_fb_helper_debug_leave,
};

static int astfb_create_object(struct ast_fbdev *afbdev,
                   struct drm_mode_fb_cmd2 *mode_cmd,
                   struct drm_gem_object **gobj_p)
{
    struct drm_device *dev = afbdev->helper.dev;
    u32 bpp, depth;
    u32 size;
    struct drm_gem_object *gobj;

    int ret = 0;
    drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);

    size = mode_cmd->pitches[0] * mode_cmd->height;
    ret = ast_gem_create(dev, size, true, &gobj);
    if (ret)
        return ret;

    *gobj_p = gobj;
    return ret;
}

static int astfb_create(struct ast_fbdev *afbdev,
            struct drm_fb_helper_surface_size *sizes)
{
    struct drm_device *dev = afbdev->helper.dev;
    struct drm_mode_fb_cmd2 mode_cmd;
    struct drm_framebuffer *fb;
    struct fb_info *info;
    int size, ret;
    struct device *device = &dev->pdev->dev;
    void *sysram;
    struct drm_gem_object *gobj = NULL;
    struct ast_bo *bo = NULL;
    mode_cmd.width = sizes->surface_width;
    mode_cmd.height = sizes->surface_height;
    mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);

    mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
                              sizes->surface_depth);

    size = mode_cmd.pitches[0] * mode_cmd.height;

    ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
    if (ret) {
        DRM_ERROR("failed to create fbcon backing object %d\n", ret);
        return ret;
    }
    bo = gem_to_ast_bo(gobj);

    sysram = vmalloc(size);
    if (!sysram)
        return -ENOMEM;

    info = framebuffer_alloc(0, device);
    if (!info) {
        ret = -ENOMEM;
        goto out;
    }
    info->par = afbdev;

    ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
    if (ret)
        goto out;

    afbdev->sysram = sysram;
    afbdev->size = size;

    fb = &afbdev->afb.base;
    afbdev->helper.fb = fb;
    afbdev->helper.fbdev = info;

    strcpy(info->fix.id, "astdrmfb");

    info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
    info->fbops = &astfb_ops;

    ret = fb_alloc_cmap(&info->cmap, 256, 0);
    if (ret) {
        ret = -ENOMEM;
        goto out;
    }

    info->apertures = alloc_apertures(1);
    if (!info->apertures) {
        ret = -ENOMEM;
        goto out;
    }
    info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
    info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);

    drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
    drm_fb_helper_fill_var(info, &afbdev->helper, sizes->fb_width, sizes->fb_height);

    info->screen_base = sysram;
    info->screen_size = size;

    info->pixmap.flags = FB_PIXMAP_SYSTEM;

    DRM_DEBUG_KMS("allocated %dx%d\n",
              fb->width, fb->height);

    return 0;
out:
    return ret;
}

static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
                   u16 blue, int regno)
{
    struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
    ast_crtc->lut_r[regno] = red >> 8;
    ast_crtc->lut_g[regno] = green >> 8;
    ast_crtc->lut_b[regno] = blue >> 8;
}

static void ast_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
                   u16 *blue, int regno)
{
    struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
    *red = ast_crtc->lut_r[regno] << 8;
    *green = ast_crtc->lut_g[regno] << 8;
    *blue = ast_crtc->lut_b[regno] << 8;
}

static int ast_find_or_create_single(struct drm_fb_helper *helper,
                      struct drm_fb_helper_surface_size *sizes)
{
    struct ast_fbdev *afbdev = (struct ast_fbdev *)helper;
    int new_fb = 0;
    int ret;

    if (!helper->fb) {
        ret = astfb_create(afbdev, sizes);
        if (ret)
            return ret;
        new_fb = 1;
    }
    return new_fb;
}

static struct drm_fb_helper_funcs ast_fb_helper_funcs = {
    .gamma_set = ast_fb_gamma_set,
    .gamma_get = ast_fb_gamma_get,
    .fb_probe = ast_find_or_create_single,
};

static void ast_fbdev_destroy(struct drm_device *dev,
                  struct ast_fbdev *afbdev)
{
    struct fb_info *info;
    struct ast_framebuffer *afb = &afbdev->afb;
    if (afbdev->helper.fbdev) {
        info = afbdev->helper.fbdev;
        unregister_framebuffer(info);
        if (info->cmap.len)
            fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
    }

    if (afb->obj) {
        drm_gem_object_unreference_unlocked(afb->obj);
        afb->obj = NULL;
    }
    drm_fb_helper_fini(&afbdev->helper);

    vfree(afbdev->sysram);
    drm_framebuffer_cleanup(&afb->base);
}

int ast_fbdev_init(struct drm_device *dev)
{
    struct ast_private *ast = dev->dev_private;
    struct ast_fbdev *afbdev;
    int ret;

    afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
    if (!afbdev)
        return -ENOMEM;

    ast->fbdev = afbdev;
    afbdev->helper.funcs = &ast_fb_helper_funcs;
    ret = drm_fb_helper_init(dev, &afbdev->helper,
                 1, 1);
    if (ret) {
        kfree(afbdev);
        return ret;
    }

    drm_fb_helper_single_add_all_connectors(&afbdev->helper);
    drm_fb_helper_initial_config(&afbdev->helper, 32);
    return 0;
}

void ast_fbdev_fini(struct drm_device *dev)
{
    struct ast_private *ast = dev->dev_private;

    if (!ast->fbdev)
        return;

    ast_fbdev_destroy(dev, ast->fbdev);
    kfree(ast->fbdev);
    ast->fbdev = NULL;
}

void ast_fbdev_set_suspend(struct drm_device *dev, int state)
{
    struct ast_private *ast = dev->dev_private;

    if (!ast->fbdev)
        return;

    fb_set_suspend(ast->fbdev->helper.fbdev, state);
}