diff options
Diffstat (limited to 'drivers/gpu/drm/msm/msm_fbdev.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_fbdev.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c new file mode 100644 index 000000000000..6c6d7d4c9b4e --- /dev/null +++ b/drivers/gpu/drm/msm/msm_fbdev.c @@ -0,0 +1,258 @@ +/* + * 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; +} |