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Diffstat (limited to 'kernel/drivers/gpu/drm/omapdrm/omap_fbdev.c')
-rw-r--r--kernel/drivers/gpu/drm/omapdrm/omap_fbdev.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/kernel/drivers/gpu/drm/omapdrm/omap_fbdev.c b/kernel/drivers/gpu/drm/omapdrm/omap_fbdev.c
new file mode 100644
index 000000000..950cd3389
--- /dev/null
+++ b/kernel/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -0,0 +1,343 @@
+/*
+ * drivers/gpu/drm/omapdrm/omap_fbdev.c
+ *
+ * Copyright (C) 2011 Texas Instruments
+ * Author: Rob Clark <rob@ti.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 "omap_drv.h"
+
+#include "drm_crtc.h"
+#include "drm_fb_helper.h"
+
+MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
+static bool ywrap_enabled = true;
+module_param_named(ywrap, ywrap_enabled, bool, 0644);
+
+/*
+ * fbdev funcs, to implement legacy fbdev interface on top of drm driver
+ */
+
+#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
+
+struct omap_fbdev {
+ struct drm_fb_helper base;
+ struct drm_framebuffer *fb;
+ struct drm_gem_object *bo;
+ bool ywrap_enabled;
+
+ /* for deferred dmm roll when getting called in atomic ctx */
+ struct work_struct work;
+};
+
+static struct drm_fb_helper *get_fb(struct fb_info *fbi);
+
+static void pan_worker(struct work_struct *work)
+{
+ struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
+ struct fb_info *fbi = fbdev->base.fbdev;
+ int npages;
+
+ /* DMM roll shifts in 4K pages: */
+ npages = fbi->fix.line_length >> PAGE_SHIFT;
+ omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
+}
+
+static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *fbi)
+{
+ struct drm_fb_helper *helper = get_fb(fbi);
+ struct omap_fbdev *fbdev = to_omap_fbdev(helper);
+
+ if (!helper)
+ goto fallback;
+
+ if (!fbdev->ywrap_enabled)
+ goto fallback;
+
+ if (drm_can_sleep()) {
+ pan_worker(&fbdev->work);
+ } else {
+ struct omap_drm_private *priv = helper->dev->dev_private;
+ queue_work(priv->wq, &fbdev->work);
+ }
+
+ return 0;
+
+fallback:
+ return drm_fb_helper_pan_display(var, fbi);
+}
+
+static struct fb_ops omap_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 = omap_fbdev_pan_display,
+ .fb_blank = drm_fb_helper_blank,
+ .fb_setcmap = drm_fb_helper_setcmap,
+};
+
+static int omap_fbdev_create(struct drm_fb_helper *helper,
+ struct drm_fb_helper_surface_size *sizes)
+{
+ struct omap_fbdev *fbdev = to_omap_fbdev(helper);
+ struct drm_device *dev = helper->dev;
+ struct omap_drm_private *priv = dev->dev_private;
+ struct drm_framebuffer *fb = NULL;
+ union omap_gem_size gsize;
+ struct fb_info *fbi = NULL;
+ struct drm_mode_fb_cmd2 mode_cmd = {0};
+ dma_addr_t paddr;
+ int ret;
+
+ /* 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 + 7) / 8),
+ mode_cmd.width, sizes->surface_bpp);
+
+ fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
+ if (fbdev->ywrap_enabled) {
+ /* need to align pitch to page size if using DMM scrolling */
+ mode_cmd.pitches[0] = ALIGN(mode_cmd.pitches[0], PAGE_SIZE);
+ }
+
+ /* allocate backing bo */
+ gsize = (union omap_gem_size){
+ .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
+ };
+ DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
+ fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
+ if (!fbdev->bo) {
+ dev_err(dev->dev, "failed to allocate buffer object\n");
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ fb = omap_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;
+ }
+
+ /* note: this keeps the bo pinned.. which is perhaps not ideal,
+ * but is needed as long as we use fb_mmap() to mmap to userspace
+ * (since this happens using fix.smem_start). Possibly we could
+ * implement our own mmap using GEM mmap support to avoid this
+ * (non-tiled buffer doesn't need to be pinned for fbcon to write
+ * to it). Then we just need to be sure that we are able to re-
+ * pin it in case of an opps.
+ */
+ ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
+ if (ret) {
+ dev_err(dev->dev,
+ "could not map (paddr)! Skipping framebuffer alloc\n");
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ mutex_lock(&dev->struct_mutex);
+
+ 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 = &omap_fb_ops;
+
+ strcpy(fbi->fix.id, MODULE_NAME);
+
+ 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 = omap_gem_vaddr(fbdev->bo);
+ fbi->screen_size = fbdev->bo->size;
+ fbi->fix.smem_start = paddr;
+ fbi->fix.smem_len = fbdev->bo->size;
+
+ /* if we have DMM, then we can use it for scrolling by just
+ * shuffling pages around in DMM rather than doing sw blit.
+ */
+ if (fbdev->ywrap_enabled) {
+ DRM_INFO("Enabling DMM ywrap scrolling\n");
+ fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
+ fbi->fix.ywrapstep = 1;
+ }
+
+
+ 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 const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
+ .fb_probe = omap_fbdev_create,
+};
+
+static struct drm_fb_helper *get_fb(struct fb_info *fbi)
+{
+ if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
+ /* these are not the fb's you're looking for */
+ return NULL;
+ }
+ return fbi->par;
+}
+
+/* initialize fbdev helper */
+struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
+{
+ struct omap_drm_private *priv = dev->dev_private;
+ struct omap_fbdev *fbdev = NULL;
+ struct drm_fb_helper *helper;
+ int ret = 0;
+
+ fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
+ if (!fbdev)
+ goto fail;
+
+ INIT_WORK(&fbdev->work, pan_worker);
+
+ helper = &fbdev->base;
+
+ drm_fb_helper_prepare(dev, helper, &omap_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;
+ }
+
+ ret = drm_fb_helper_single_add_all_connectors(helper);
+ if (ret)
+ goto fini;
+
+ /* disable all the possible outputs/crtcs before entering KMS mode */
+ drm_helper_disable_unused_functions(dev);
+
+ ret = drm_fb_helper_initial_config(helper, 32);
+ if (ret)
+ goto fini;
+
+ priv->fbdev = helper;
+
+ return helper;
+
+fini:
+ drm_fb_helper_fini(helper);
+fail:
+ kfree(fbdev);
+ return NULL;
+}
+
+void omap_fbdev_free(struct drm_device *dev)
+{
+ struct omap_drm_private *priv = dev->dev_private;
+ struct drm_fb_helper *helper = priv->fbdev;
+ struct omap_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_omap_fbdev(priv->fbdev);
+
+ /* release the ref taken in omap_fbdev_create() */
+ omap_gem_put_paddr(fbdev->bo);
+
+ /* 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;
+}