/*
* 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"
#include "msm_gem.h"
extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma);
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
/*
* 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_mmap = msm_fbdev_mmap,
.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_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
struct msm_fbdev *fbdev = to_msm_fbdev(helper);
struct drm_gem_object *drm_obj = fbdev->bo;
struct drm_device *dev = helper->dev;
int ret = 0;
if (drm_device_is_unplugged(dev))
return -ENODEV;
mutex_lock(&dev->struct_mutex);
ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
mutex_unlock(&dev->struct_mutex);
if (ret) {
pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
return ret;
}
return msm_gem_mmap_obj(drm_obj, vma);
}
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};
uint32_t paddr;
int ret, size;
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);
/*
* NOTE: if we can be guaranteed to be able to map buffer
* in panic (ie. lock-safe, etc) we could avoid pinning the
* buffer now:
*/
ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
if (ret) {
dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
goto fail_unlock;
}
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 const 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;
fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
if (!fbdev)
goto fail;
helper = &fbdev->base;
drm_fb_helper_prepare(dev, helper, &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;
}
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