1 files changed, 298 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omap/omap_fbdev.c b/drivers/gpu/drm/omap/omap_fbdev.c
new file mode 100644
index 00000000000..84b94dbfea4
--- /dev/null
+++ b/drivers/gpu/drm/omap/omap_fbdev.c
@@ -0,0 +1,298 @@
+/*
+ * linux/drivers/gpu/drm/omap/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 <linux/omap_gpu.h>
+#include "omap_gpu_priv.h"
+
+#include "drm_crtc.h"
+#include "drm_fb_helper.h"
+
+/*
+ * 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;
+};
+
+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 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 = drm_fb_helper_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 fb_info *fbi;
+	struct drm_mode_fb_cmd mode_cmd = {0};
+	struct device *device = &dev->platformdev->dev;
+	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", sizes->surface_width,
+			sizes->surface_height, sizes->surface_bpp);
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+
+	mode_cmd.bpp = sizes->surface_bpp;
+	mode_cmd.depth = sizes->surface_depth;
+
+	mutex_lock(&dev->struct_mutex);
+
+	fbi = framebuffer_alloc(0, device);
+	if (!fbi) {
+		dev_err(dev->dev, "failed to allocate fb info\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	DBG("fbi=%p, dev=%p", fbi, dev);
+
+	fbdev->fb = omap_framebuffer_init(dev, &mode_cmd);
+	if (!fbdev->fb) {
+		dev_err(dev->dev, "failed to allocate fb\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	helper->fb = fbdev->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;
+	}
+
+	omap_fbdev_update(helper, fbdev->fb);
+
+	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:
+	mutex_unlock(&dev->struct_mutex);
+	// TODO cleanup?
+	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");
+	// XXX ignore?
+}
+
+static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
+		u16 *red, u16 *green, u16 *blue, int regno)
+{
+	DBG("fbdev: get gamma");
+	// XXX ignore?
+}
+
+static int omap_fbdev_probe(struct drm_fb_helper *helper,
+		struct drm_fb_helper_surface_size *sizes)
+{
+	int new_fb = 0;
+	int ret;
+
+	if (!helper->fb) {
+		ret = omap_fbdev_create(helper, sizes);
+		if (ret)
+			return ret;
+		new_fb = 1;
+	}
+	return new_fb;
+}
+
+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_probe,
+};
+
+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;
+}
+
+void omap_fbdev_update(struct drm_fb_helper *helper,
+		struct drm_framebuffer *fb)
+{
+	struct fb_info *fbi = helper->fbdev;
+	struct drm_device *dev = helper->dev;
+	struct omap_fbdev *fbdev = to_omap_fbdev(helper);
+	unsigned long paddr;
+	void __iomem *vaddr;
+	int size, screen_width;
+
+	DBG("update fbdev: %dx%d, fbi=%p", fb->width, fb->height, fbi);
+
+	fbdev->fb = fb;
+
+	drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
+	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
+
+	size = omap_framebuffer_get_buffer(fbdev->fb, 0, 0,
+			&vaddr, &paddr, &screen_width);
+
+	dev->mode_config.fb_base = paddr;
+
+	fbi->screen_base = vaddr;
+	fbi->screen_size = size;
+	fbi->fix.smem_start = paddr;
+	fbi->fix.smem_len = size;
+}
+
+struct drm_connector * omap_fbdev_get_next_connector(struct fb_info *fbi,
+		struct drm_connector *from)
+{
+	struct drm_fb_helper *helper = get_fb(fbi);
+
+	if (!helper)
+		return NULL;
+
+	return omap_framebuffer_get_next_connector(helper->fb, from);
+}
+EXPORT_SYMBOL(omap_fbdev_get_next_connector);
+
+/* flush an area of the framebuffer (in case of manual update display that
+ * is not automatically flushed)
+ */
+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);
+}
+EXPORT_SYMBOL(omap_fbdev_flush);
+
+/* initialize fbdev helper */
+struct drm_fb_helper * omap_fbdev_init(struct drm_device *dev)
+{
+	struct omap_gpu_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) {
+		dev_err(dev->dev, "could not allocate fbdev\n");
+		goto fail;
+	}
+
+	helper = &fbdev->base;
+
+	helper->funcs = &omap_fb_helper_funcs;
+
+	ret = drm_fb_helper_init(dev, helper, priv->num_crtcs, 4);
+	if (ret) {
+		dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
+		goto fail;
+	}
+
+	drm_fb_helper_single_add_all_connectors(helper);
+	drm_fb_helper_initial_config(helper, 32);
+
+	priv->fbdev = helper;
+
+	return helper;
+
+fail:
+	if (fbdev) {
+		kfree(fbdev);
+	}
+	return NULL;
+}