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;
+}