1 files changed, 397 insertions, 0 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
new file mode 100644
index 000000000000..b11ce609fcc2
--- /dev/null
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -0,0 +1,397 @@
+/*
+ * 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 void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
+static struct drm_fb_helper *get_fb(struct fb_info *fbi);
+
+static ssize_t omap_fbdev_write(struct fb_info *fbi, const char __user *buf,
+                size_t count, loff_t *ppos)
+{
+        ssize_t res;
+
+        res = fb_sys_write(fbi, buf, count, ppos);
+        omap_fbdev_flush(fbi, 0, 0, fbi->var.xres, fbi->var.yres);
+
+        return res;
+}
+
+static void omap_fbdev_fillrect(struct fb_info *fbi,
+                const struct fb_fillrect *rect)
+{
+        sys_fillrect(fbi, rect);
+        omap_fbdev_flush(fbi, rect->dx, rect->dy, rect->width, rect->height);
+}
+
+static void omap_fbdev_copyarea(struct fb_info *fbi,
+                const struct fb_copyarea *area)
+{
+        sys_copyarea(fbi, area);
+        omap_fbdev_flush(fbi, area->dx, area->dy, area->width, area->height);
+}
+
+static void omap_fbdev_imageblit(struct fb_info *fbi,
+                const struct fb_image *image)
+{
+        sys_imageblit(fbi, image);
+        omap_fbdev_flush(fbi, image->dx, image->dy,
+                                image->width, image->height);
+}
+
+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 = omap_fbdev_write,
+        .fb_fillrect = omap_fbdev_fillrect,
+        .fb_copyarea = omap_fbdev_copyarea,
+        .fb_imageblit = omap_fbdev_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 void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
+                u16 red, u16 green, u16 blue, int regno)
+{
+        DBG("fbdev: set gamma");
+}
+
+static void omap_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 omap_fb_helper_funcs = {
+        .gamma_set = omap_crtc_fb_gamma_set,
+        .gamma_get = omap_crtc_fb_gamma_get,
+        .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;
+}
+
+/* flush an area of the framebuffer (in case of manual update display that
+ * is not automatically flushed)
+ */
+static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
+{
+        struct drm_fb_helper *helper = get_fb(fbi);
+
+        if (!helper)
+                return;
+
+        VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
+
+        omap_framebuffer_flush(helper->fb, x, y, w, h);
+}
+
+/* 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;
+
+        helper->funcs = &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;
+        }
+
+        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 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);
+
+        /* 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;
+}