// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
* Author: Rob Clark <[email protected]>
*/
#include <linux/fb.h>
#include <drm/drm_drv.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_file.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_util.h>
#include "omap_drv.h"
#include "omap_fbdev.h"
MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
static bool ywrap_enabled = true;
module_param_named(ywrap, ywrap_enabled, bool, 0644);
/*
* 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;
bool ywrap_enabled;
/* for deferred dmm roll when getting called in atomic ctx */
struct work_struct work;
};
static struct drm_fb_helper *get_fb(struct fb_info *fbi);
static void pan_worker(struct work_struct *work)
{
struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
struct drm_fb_helper *helper = &fbdev->base;
struct fb_info *fbi = helper->info;
struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0);
int npages;
/* DMM roll shifts in 4K pages: */
npages = fbi->fix.line_length >> PAGE_SHIFT;
omap_gem_roll(bo, fbi->var.yoffset * npages);
}
FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev,
drm_fb_helper_damage_range,
drm_fb_helper_damage_area)
static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
struct fb_info *fbi)
{
struct drm_fb_helper *helper = get_fb(fbi);
struct omap_fbdev *fbdev = to_omap_fbdev(helper);
if (!helper)
goto fallback;
if (!fbdev->ywrap_enabled)
goto fallback;
if (drm_can_sleep()) {
pan_worker(&fbdev->work);
} else {
struct omap_drm_private *priv = helper->dev->dev_private;
queue_work(priv->wq, &fbdev->work);
}
return 0;
fallback:
return drm_fb_helper_pan_display(var, fbi);
}
static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
return fb_deferred_io_mmap(info, vma);
}
static void omap_fbdev_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_framebuffer *fb = helper->fb;
struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0);
struct omap_fbdev *fbdev = to_omap_fbdev(helper);
DBG();
fb_deferred_io_cleanup(info);
drm_fb_helper_fini(helper);
omap_gem_unpin(bo);
drm_framebuffer_remove(fb);
drm_client_release(&helper->client);
drm_fb_helper_unprepare(helper);
kfree(fbdev);
}
/*
* For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap()
* because we use write-combine.
*/
static const struct fb_ops omap_fb_ops = {
.owner = THIS_MODULE,
__FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev),
.fb_check_var = drm_fb_helper_check_var,
.fb_set_par = drm_fb_helper_set_par,
.fb_setcmap = drm_fb_helper_setcmap,
.fb_blank = drm_fb_helper_blank,
.fb_pan_display = omap_fbdev_pan_display,
__FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev),
.fb_ioctl = drm_fb_helper_ioctl,
.fb_mmap = omap_fbdev_fb_mmap,
.fb_destroy = omap_fbdev_fb_destroy,
};
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 omap_drm_private *priv = dev->dev_private;
struct drm_framebuffer *fb = NULL;
union omap_gem_size gsize;
struct fb_info *fbi = NULL;
struct drm_mode_fb_cmd2 mode_cmd = {0};
struct drm_gem_object *bo;
dma_addr_t dma_addr;
int ret;
sizes->surface_bpp = 32;
sizes->surface_depth = 24;
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] =
DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
if (fbdev->ywrap_enabled) {
/* need to align pitch to page size if using DMM scrolling */
mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
}
/* allocate backing bo */
gsize = (union omap_gem_size){
.bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
};
DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
if (!bo) {
dev_err(dev->dev, "failed to allocate buffer object\n");
ret = -ENOMEM;
goto fail;
}
fb = omap_framebuffer_init(dev, &mode_cmd, &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_put(bo);
ret = PTR_ERR(fb);
goto fail;
}
/* note: this keeps the bo pinned.. which is perhaps not ideal,
* but is needed as long as we use fb_mmap() to mmap to userspace
* (since this happens using fix.smem_start). Possibly we could
* implement our own mmap using GEM mmap support to avoid this
* (non-tiled buffer doesn't need to be pinned for fbcon to write
* to it). Then we just need to be sure that we are able to re-
* pin it in case of an opps.
*/
ret = omap_gem_pin(bo, &dma_addr);
if (ret) {
dev_err(dev->dev, "could not pin framebuffer\n");
ret = -ENOMEM;
goto fail;
}
fbi = drm_fb_helper_alloc_info(helper);
if (IS_ERR(fbi)) {
dev_err(dev->dev, "failed to allocate fb info\n");
ret = PTR_ERR(fbi);
goto fail;
}
DBG("fbi=%p, dev=%p", fbi, dev);
helper->fb = fb;
fbi->fbops = &omap_fb_ops;
drm_fb_helper_fill_info(fbi, helper, sizes);
fbi->flags |= FBINFO_VIRTFB;
fbi->screen_buffer = omap_gem_vaddr(bo);
fbi->screen_size = bo->size;
fbi->fix.smem_start = dma_addr;
fbi->fix.smem_len = bo->size;
/* deferred I/O */
helper->fbdefio.delay = HZ / 20;
helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
fbi->fbdefio = &helper->fbdefio;
ret = fb_deferred_io_init(fbi);
if (ret)
goto fail;
/* if we have DMM, then we can use it for scrolling by just
* shuffling pages around in DMM rather than doing sw blit.
*/
if (fbdev->ywrap_enabled) {
DRM_INFO("Enabling DMM ywrap scrolling\n");
fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
fbi->fix.ywrapstep = 1;
}
DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
DBG("allocated %dx%d fb", fb->width, fb->height);
return 0;
fail:
if (ret) {
if (fb)
drm_framebuffer_remove(fb);
}
return ret;
}
static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
{
if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
return 0;
if (helper->fb->funcs->dirty)
return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
return 0;
}
static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
.fb_probe = omap_fbdev_create,
.fb_dirty = omap_fbdev_dirty,
};
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;
}
/*
* struct drm_client
*/
static void omap_fbdev_client_unregister(struct drm_client_dev *client)
{
struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
if (fb_helper->info) {
drm_fb_helper_unregister_info(fb_helper);
} else {
drm_client_release(&fb_helper->client);
drm_fb_helper_unprepare(fb_helper);
kfree(fb_helper);
}
}
static int omap_fbdev_client_restore(struct drm_client_dev *client)
{
drm_fb_helper_lastclose(client->dev);
return 0;
}
static int omap_fbdev_client_hotplug(struct drm_client_dev *client)
{
struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
struct drm_device *dev = client->dev;
int ret;
if (dev->fb_helper)
return drm_fb_helper_hotplug_event(dev->fb_helper);
ret = drm_fb_helper_init(dev, fb_helper);
if (ret)
goto err_drm_err;
ret = drm_fb_helper_initial_config(fb_helper);
if (ret)
goto err_drm_fb_helper_fini;
return 0;
err_drm_fb_helper_fini:
drm_fb_helper_fini(fb_helper);
err_drm_err:
drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
return ret;
}
static const struct drm_client_funcs omap_fbdev_client_funcs = {
.owner = THIS_MODULE,
.unregister = omap_fbdev_client_unregister,
.restore = omap_fbdev_client_restore,
.hotplug = omap_fbdev_client_hotplug,
};
void omap_fbdev_setup(struct drm_device *dev)
{
struct omap_fbdev *fbdev;
struct drm_fb_helper *helper;
int ret;
drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
if (!fbdev)
return;
helper = &fbdev->base;
drm_fb_helper_prepare(dev, helper, 32, &omap_fb_helper_funcs);
ret = drm_client_init(dev, &helper->client, "fbdev", &omap_fbdev_client_funcs);
if (ret)
goto err_drm_client_init;
INIT_WORK(&fbdev->work, pan_worker);
drm_client_register(&helper->client);
return;
err_drm_client_init:
drm_fb_helper_unprepare(helper);
kfree(fbdev);
}
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