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- /*
- * Copyright (C) 2013 Red Hat
- * Author: Rob Clark <robdclark@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #include "msm_drv.h"
- #include "drm_crtc.h"
- #include "drm_fb_helper.h"
- /*
- * fbdev funcs, to implement legacy fbdev interface on top of drm driver
- */
- #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
- struct msm_fbdev {
- struct drm_fb_helper base;
- struct drm_framebuffer *fb;
- struct drm_gem_object *bo;
- };
- static struct fb_ops msm_fb_ops = {
- .owner = THIS_MODULE,
- /* Note: to properly handle manual update displays, we wrap the
- * basic fbdev ops which write to the framebuffer
- */
- .fb_read = fb_sys_read,
- .fb_write = fb_sys_write,
- .fb_fillrect = sys_fillrect,
- .fb_copyarea = sys_copyarea,
- .fb_imageblit = sys_imageblit,
- .fb_check_var = drm_fb_helper_check_var,
- .fb_set_par = drm_fb_helper_set_par,
- .fb_pan_display = drm_fb_helper_pan_display,
- .fb_blank = drm_fb_helper_blank,
- .fb_setcmap = drm_fb_helper_setcmap,
- };
- static int msm_fbdev_create(struct drm_fb_helper *helper,
- struct drm_fb_helper_surface_size *sizes)
- {
- struct msm_fbdev *fbdev = to_msm_fbdev(helper);
- struct drm_device *dev = helper->dev;
- struct drm_framebuffer *fb = NULL;
- struct fb_info *fbi = NULL;
- struct drm_mode_fb_cmd2 mode_cmd = {0};
- dma_addr_t paddr;
- int ret, size;
- /* only doing ARGB32 since this is what is needed to alpha-blend
- * with video overlays:
- */
- sizes->surface_bpp = 32;
- sizes->surface_depth = 32;
- DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
- sizes->surface_height, sizes->surface_bpp,
- sizes->fb_width, sizes->fb_height);
- mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
- sizes->surface_depth);
- mode_cmd.width = sizes->surface_width;
- mode_cmd.height = sizes->surface_height;
- mode_cmd.pitches[0] = align_pitch(
- mode_cmd.width, sizes->surface_bpp);
- /* allocate backing bo */
- size = mode_cmd.pitches[0] * mode_cmd.height;
- DBG("allocating %d bytes for fb %d", size, dev->primary->index);
- mutex_lock(&dev->struct_mutex);
- fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
- mutex_unlock(&dev->struct_mutex);
- if (IS_ERR(fbdev->bo)) {
- ret = PTR_ERR(fbdev->bo);
- fbdev->bo = NULL;
- dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
- goto fail;
- }
- fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
- if (IS_ERR(fb)) {
- dev_err(dev->dev, "failed to allocate fb\n");
- /* note: if fb creation failed, we can't rely on fb destroy
- * to unref the bo:
- */
- drm_gem_object_unreference(fbdev->bo);
- ret = PTR_ERR(fb);
- goto fail;
- }
- mutex_lock(&dev->struct_mutex);
- /* TODO implement our own fb_mmap so we don't need this: */
- msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
- fbi = framebuffer_alloc(0, dev->dev);
- if (!fbi) {
- dev_err(dev->dev, "failed to allocate fb info\n");
- ret = -ENOMEM;
- goto fail_unlock;
- }
- DBG("fbi=%p, dev=%p", fbi, dev);
- fbdev->fb = fb;
- helper->fb = fb;
- helper->fbdev = fbi;
- fbi->par = helper;
- fbi->flags = FBINFO_DEFAULT;
- fbi->fbops = &msm_fb_ops;
- strcpy(fbi->fix.id, "msm");
- ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
- if (ret) {
- ret = -ENOMEM;
- goto fail_unlock;
- }
- drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
- drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
- dev->mode_config.fb_base = paddr;
- fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
- fbi->screen_size = fbdev->bo->size;
- fbi->fix.smem_start = paddr;
- fbi->fix.smem_len = fbdev->bo->size;
- DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
- DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
- mutex_unlock(&dev->struct_mutex);
- return 0;
- fail_unlock:
- mutex_unlock(&dev->struct_mutex);
- fail:
- if (ret) {
- if (fbi)
- framebuffer_release(fbi);
- if (fb) {
- drm_framebuffer_unregister_private(fb);
- drm_framebuffer_remove(fb);
- }
- }
- return ret;
- }
- static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
- u16 red, u16 green, u16 blue, int regno)
- {
- DBG("fbdev: set gamma");
- }
- static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
- u16 *red, u16 *green, u16 *blue, int regno)
- {
- DBG("fbdev: get gamma");
- }
- static struct drm_fb_helper_funcs msm_fb_helper_funcs = {
- .gamma_set = msm_crtc_fb_gamma_set,
- .gamma_get = msm_crtc_fb_gamma_get,
- .fb_probe = msm_fbdev_create,
- };
- /* initialize fbdev helper */
- struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
- {
- struct msm_drm_private *priv = dev->dev_private;
- struct msm_fbdev *fbdev = NULL;
- struct drm_fb_helper *helper;
- int ret = 0;
- fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
- if (!fbdev)
- goto fail;
- helper = &fbdev->base;
- helper->funcs = &msm_fb_helper_funcs;
- ret = drm_fb_helper_init(dev, helper,
- priv->num_crtcs, priv->num_connectors);
- if (ret) {
- dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
- goto fail;
- }
- drm_fb_helper_single_add_all_connectors(helper);
- /* disable all the possible outputs/crtcs before entering KMS mode */
- drm_helper_disable_unused_functions(dev);
- drm_fb_helper_initial_config(helper, 32);
- priv->fbdev = helper;
- return helper;
- fail:
- kfree(fbdev);
- return NULL;
- }
- void msm_fbdev_free(struct drm_device *dev)
- {
- struct msm_drm_private *priv = dev->dev_private;
- struct drm_fb_helper *helper = priv->fbdev;
- struct msm_fbdev *fbdev;
- struct fb_info *fbi;
- DBG();
- fbi = helper->fbdev;
- /* only cleanup framebuffer if it is present */
- if (fbi) {
- unregister_framebuffer(fbi);
- framebuffer_release(fbi);
- }
- drm_fb_helper_fini(helper);
- fbdev = to_msm_fbdev(priv->fbdev);
- /* this will free the backing object */
- if (fbdev->fb) {
- drm_framebuffer_unregister_private(fbdev->fb);
- drm_framebuffer_remove(fbdev->fb);
- }
- kfree(fbdev);
- priv->fbdev = NULL;
- }
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