410 lines
10 KiB
C
410 lines
10 KiB
C
/*
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* drivers/staging/omapdrm/omap_fbdev.c
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*
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* Copyright (C) 2011 Texas Instruments
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* Author: Rob Clark <rob@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "omap_drv.h"
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#include "drm_crtc.h"
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#include "drm_fb_helper.h"
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MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
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static bool ywrap_enabled = true;
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module_param_named(ywrap, ywrap_enabled, bool, 0644);
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/*
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* fbdev funcs, to implement legacy fbdev interface on top of drm driver
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*/
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#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
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struct omap_fbdev {
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struct drm_fb_helper base;
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struct drm_framebuffer *fb;
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struct drm_gem_object *bo;
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bool ywrap_enabled;
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/* for deferred dmm roll when getting called in atomic ctx */
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struct work_struct work;
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};
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static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
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static struct drm_fb_helper *get_fb(struct fb_info *fbi);
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static ssize_t omap_fbdev_write(struct fb_info *fbi, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t res;
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res = fb_sys_write(fbi, buf, count, ppos);
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omap_fbdev_flush(fbi, 0, 0, fbi->var.xres, fbi->var.yres);
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return res;
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}
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static void omap_fbdev_fillrect(struct fb_info *fbi,
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const struct fb_fillrect *rect)
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{
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sys_fillrect(fbi, rect);
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omap_fbdev_flush(fbi, rect->dx, rect->dy, rect->width, rect->height);
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}
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static void omap_fbdev_copyarea(struct fb_info *fbi,
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const struct fb_copyarea *area)
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{
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sys_copyarea(fbi, area);
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omap_fbdev_flush(fbi, area->dx, area->dy, area->width, area->height);
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}
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static void omap_fbdev_imageblit(struct fb_info *fbi,
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const struct fb_image *image)
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{
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sys_imageblit(fbi, image);
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omap_fbdev_flush(fbi, image->dx, image->dy,
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image->width, image->height);
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}
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static void pan_worker(struct work_struct *work)
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{
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struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
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struct fb_info *fbi = fbdev->base.fbdev;
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int npages;
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/* DMM roll shifts in 4K pages: */
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npages = fbi->fix.line_length >> PAGE_SHIFT;
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omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
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}
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static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *fbi)
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{
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struct drm_fb_helper *helper = get_fb(fbi);
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struct omap_fbdev *fbdev = to_omap_fbdev(helper);
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if (!helper)
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goto fallback;
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if (!fbdev->ywrap_enabled)
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goto fallback;
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if (drm_can_sleep()) {
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pan_worker(&fbdev->work);
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} else {
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struct omap_drm_private *priv = helper->dev->dev_private;
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queue_work(priv->wq, &fbdev->work);
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}
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return 0;
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fallback:
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return drm_fb_helper_pan_display(var, fbi);
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}
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static struct fb_ops omap_fb_ops = {
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.owner = THIS_MODULE,
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/* Note: to properly handle manual update displays, we wrap the
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* basic fbdev ops which write to the framebuffer
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*/
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.fb_read = fb_sys_read,
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.fb_write = omap_fbdev_write,
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.fb_fillrect = omap_fbdev_fillrect,
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.fb_copyarea = omap_fbdev_copyarea,
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.fb_imageblit = omap_fbdev_imageblit,
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.fb_check_var = drm_fb_helper_check_var,
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.fb_set_par = drm_fb_helper_set_par,
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.fb_pan_display = omap_fbdev_pan_display,
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.fb_blank = drm_fb_helper_blank,
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.fb_setcmap = drm_fb_helper_setcmap,
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.fb_debug_enter = drm_fb_helper_debug_enter,
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.fb_debug_leave = drm_fb_helper_debug_leave,
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};
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static int omap_fbdev_create(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct omap_fbdev *fbdev = to_omap_fbdev(helper);
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struct drm_device *dev = helper->dev;
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struct omap_drm_private *priv = dev->dev_private;
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struct drm_framebuffer *fb = NULL;
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union omap_gem_size gsize;
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struct fb_info *fbi = NULL;
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struct drm_mode_fb_cmd2 mode_cmd = {0};
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dma_addr_t paddr;
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int ret;
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/* only doing ARGB32 since this is what is needed to alpha-blend
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* with video overlays:
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*/
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sizes->surface_bpp = 32;
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sizes->surface_depth = 32;
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DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
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sizes->surface_height, sizes->surface_bpp,
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sizes->fb_width, sizes->fb_height);
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mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
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sizes->surface_depth);
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mode_cmd.width = sizes->surface_width;
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mode_cmd.height = sizes->surface_height;
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mode_cmd.pitches[0] = align_pitch(
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mode_cmd.width * ((sizes->surface_bpp + 7) / 8),
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mode_cmd.width, sizes->surface_bpp);
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fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
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if (fbdev->ywrap_enabled) {
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/* need to align pitch to page size if using DMM scrolling */
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mode_cmd.pitches[0] = ALIGN(mode_cmd.pitches[0], PAGE_SIZE);
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}
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/* allocate backing bo */
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gsize = (union omap_gem_size){
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.bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
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};
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DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
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fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
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if (!fbdev->bo) {
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dev_err(dev->dev, "failed to allocate buffer object\n");
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ret = -ENOMEM;
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goto fail;
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}
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fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
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if (IS_ERR(fb)) {
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dev_err(dev->dev, "failed to allocate fb\n");
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/* note: if fb creation failed, we can't rely on fb destroy
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* to unref the bo:
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*/
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drm_gem_object_unreference(fbdev->bo);
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ret = PTR_ERR(fb);
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goto fail;
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}
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/* note: this keeps the bo pinned.. which is perhaps not ideal,
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* but is needed as long as we use fb_mmap() to mmap to userspace
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* (since this happens using fix.smem_start). Possibly we could
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* implement our own mmap using GEM mmap support to avoid this
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* (non-tiled buffer doesn't need to be pinned for fbcon to write
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* to it). Then we just need to be sure that we are able to re-
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* pin it in case of an opps.
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*/
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ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
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if (ret) {
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dev_err(dev->dev,
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"could not map (paddr)! Skipping framebuffer alloc\n");
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ret = -ENOMEM;
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goto fail;
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}
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mutex_lock(&dev->struct_mutex);
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fbi = framebuffer_alloc(0, dev->dev);
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if (!fbi) {
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dev_err(dev->dev, "failed to allocate fb info\n");
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ret = -ENOMEM;
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goto fail_unlock;
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}
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DBG("fbi=%p, dev=%p", fbi, dev);
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fbdev->fb = fb;
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helper->fb = fb;
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helper->fbdev = fbi;
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fbi->par = helper;
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fbi->flags = FBINFO_DEFAULT;
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fbi->fbops = &omap_fb_ops;
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strcpy(fbi->fix.id, MODULE_NAME);
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ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
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if (ret) {
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ret = -ENOMEM;
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goto fail_unlock;
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}
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drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
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drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
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dev->mode_config.fb_base = paddr;
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fbi->screen_base = omap_gem_vaddr(fbdev->bo);
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fbi->screen_size = fbdev->bo->size;
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fbi->fix.smem_start = paddr;
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fbi->fix.smem_len = fbdev->bo->size;
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/* if we have DMM, then we can use it for scrolling by just
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* shuffling pages around in DMM rather than doing sw blit.
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*/
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if (fbdev->ywrap_enabled) {
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DRM_INFO("Enabling DMM ywrap scrolling\n");
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fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
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fbi->fix.ywrapstep = 1;
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}
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DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
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DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
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mutex_unlock(&dev->struct_mutex);
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return 0;
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fail_unlock:
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mutex_unlock(&dev->struct_mutex);
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fail:
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if (ret) {
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if (fbi)
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framebuffer_release(fbi);
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if (fb)
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drm_framebuffer_remove(fb);
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}
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return ret;
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}
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static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
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u16 red, u16 green, u16 blue, int regno)
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{
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DBG("fbdev: set gamma");
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}
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static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
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u16 *red, u16 *green, u16 *blue, int regno)
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{
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DBG("fbdev: get gamma");
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}
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static int omap_fbdev_probe(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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int new_fb = 0;
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int ret;
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if (!helper->fb) {
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ret = omap_fbdev_create(helper, sizes);
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if (ret)
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return ret;
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new_fb = 1;
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}
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return new_fb;
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}
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static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
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.gamma_set = omap_crtc_fb_gamma_set,
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.gamma_get = omap_crtc_fb_gamma_get,
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.fb_probe = omap_fbdev_probe,
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};
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static struct drm_fb_helper *get_fb(struct fb_info *fbi)
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{
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if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
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/* these are not the fb's you're looking for */
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return NULL;
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}
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return fbi->par;
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}
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/* flush an area of the framebuffer (in case of manual update display that
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* is not automatically flushed)
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*/
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static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
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{
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struct drm_fb_helper *helper = get_fb(fbi);
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if (!helper)
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return;
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VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
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omap_framebuffer_flush(helper->fb, x, y, w, h);
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}
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/* initialize fbdev helper */
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struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
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{
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struct omap_drm_private *priv = dev->dev_private;
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struct omap_fbdev *fbdev = NULL;
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struct drm_fb_helper *helper;
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int ret = 0;
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fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
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if (!fbdev) {
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dev_err(dev->dev, "could not allocate fbdev\n");
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goto fail;
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}
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INIT_WORK(&fbdev->work, pan_worker);
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helper = &fbdev->base;
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helper->funcs = &omap_fb_helper_funcs;
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ret = drm_fb_helper_init(dev, helper,
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priv->num_crtcs, priv->num_connectors);
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if (ret) {
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dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
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goto fail;
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}
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drm_fb_helper_single_add_all_connectors(helper);
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drm_fb_helper_initial_config(helper, 32);
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priv->fbdev = helper;
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return helper;
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fail:
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kfree(fbdev);
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return NULL;
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}
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void omap_fbdev_free(struct drm_device *dev)
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{
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struct omap_drm_private *priv = dev->dev_private;
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struct drm_fb_helper *helper = priv->fbdev;
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struct omap_fbdev *fbdev;
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struct fb_info *fbi;
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DBG();
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fbi = helper->fbdev;
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/* only cleanup framebuffer if it is present */
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if (fbi) {
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unregister_framebuffer(fbi);
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framebuffer_release(fbi);
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}
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drm_fb_helper_fini(helper);
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fbdev = to_omap_fbdev(priv->fbdev);
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/* this will free the backing object */
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if (fbdev->fb)
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drm_framebuffer_remove(fbdev->fb);
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kfree(fbdev);
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priv->fbdev = NULL;
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}
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