281 lines
6.8 KiB
C
281 lines
6.8 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.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 "msm_drv.h"
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#include "drm_crtc.h"
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#include "drm_fb_helper.h"
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#include "msm_gem.h"
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extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
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struct vm_area_struct *vma);
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static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
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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_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
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struct msm_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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};
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static struct fb_ops msm_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 = drm_fb_helper_sys_read,
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.fb_write = drm_fb_helper_sys_write,
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.fb_fillrect = drm_fb_helper_sys_fillrect,
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.fb_copyarea = drm_fb_helper_sys_copyarea,
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.fb_imageblit = drm_fb_helper_sys_imageblit,
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.fb_mmap = msm_fbdev_mmap,
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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 = drm_fb_helper_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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};
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static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
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struct msm_fbdev *fbdev = to_msm_fbdev(helper);
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struct drm_gem_object *drm_obj = fbdev->bo;
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struct drm_device *dev = helper->dev;
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int ret = 0;
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if (drm_device_is_unplugged(dev))
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return -ENODEV;
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mutex_lock(&dev->struct_mutex);
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ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
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mutex_unlock(&dev->struct_mutex);
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if (ret) {
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pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
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return ret;
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}
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return msm_gem_mmap_obj(drm_obj, vma);
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}
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static int msm_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 msm_fbdev *fbdev = to_msm_fbdev(helper);
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struct drm_device *dev = helper->dev;
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struct drm_framebuffer *fb = NULL;
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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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uint32_t paddr;
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int ret, size;
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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);
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/* allocate backing bo */
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size = mode_cmd.pitches[0] * mode_cmd.height;
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DBG("allocating %d bytes for fb %d", size, dev->primary->index);
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mutex_lock(&dev->struct_mutex);
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fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
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MSM_BO_WC | MSM_BO_STOLEN);
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mutex_unlock(&dev->struct_mutex);
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if (IS_ERR(fbdev->bo)) {
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ret = PTR_ERR(fbdev->bo);
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fbdev->bo = NULL;
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dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
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goto fail;
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}
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fb = msm_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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mutex_lock(&dev->struct_mutex);
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/*
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* NOTE: if we can be guaranteed to be able to map buffer
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* in panic (ie. lock-safe, etc) we could avoid pinning the
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* buffer now:
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*/
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ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
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if (ret) {
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dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
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goto fail_unlock;
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}
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fbi = drm_fb_helper_alloc_fbi(helper);
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if (IS_ERR(fbi)) {
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dev_err(dev->dev, "failed to allocate fb info\n");
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ret = PTR_ERR(fbi);
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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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fbi->par = helper;
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fbi->flags = FBINFO_DEFAULT;
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fbi->fbops = &msm_fb_ops;
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strcpy(fbi->fix.id, "msm");
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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 = msm_gem_vaddr_locked(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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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 (fb) {
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drm_framebuffer_unregister_private(fb);
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drm_framebuffer_remove(fb);
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}
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}
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return ret;
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}
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static void msm_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 msm_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 const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
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.gamma_set = msm_crtc_fb_gamma_set,
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.gamma_get = msm_crtc_fb_gamma_get,
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.fb_probe = msm_fbdev_create,
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};
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/* initialize fbdev helper */
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struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
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{
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struct msm_drm_private *priv = dev->dev_private;
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struct msm_fbdev *fbdev = NULL;
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struct drm_fb_helper *helper;
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int ret;
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fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
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if (!fbdev)
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goto fail;
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helper = &fbdev->base;
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drm_fb_helper_prepare(dev, helper, &msm_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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ret = drm_fb_helper_single_add_all_connectors(helper);
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if (ret)
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goto fini;
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ret = drm_fb_helper_initial_config(helper, 32);
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if (ret)
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goto fini;
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priv->fbdev = helper;
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return helper;
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fini:
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drm_fb_helper_fini(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 msm_fbdev_free(struct drm_device *dev)
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{
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struct msm_drm_private *priv = dev->dev_private;
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struct drm_fb_helper *helper = priv->fbdev;
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struct msm_fbdev *fbdev;
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DBG();
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drm_fb_helper_unregister_fbi(helper);
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drm_fb_helper_release_fbi(helper);
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drm_fb_helper_fini(helper);
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fbdev = to_msm_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_unregister_private(fbdev->fb);
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drm_framebuffer_remove(fbdev->fb);
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}
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kfree(fbdev);
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priv->fbdev = NULL;
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}
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