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// SPDX-License-Identifier: GPL-2.0-or-later
/* exynos_drm_fbdev.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Authors:
* Inki Dae <inki.dae@samsung.com>
* Joonyoung Shim <jy0922.shim@samsung.com>
* Seung-Woo Kim <sw0312.kim@samsung.com>
*/
#include <linux/fb.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_prime.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_fbdev.h"
#define MAX_CONNECTOR 4
#define PREFERRED_BPP 32
static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = info->par;
struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0);
return drm_gem_prime_mmap(obj, vma);
}
static void exynos_drm_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_framebuffer *fb = fb_helper->fb;
drm_fb_helper_fini(fb_helper);
drm_framebuffer_remove(fb);
drm_client_release(&fb_helper->client);
drm_fb_helper_unprepare(fb_helper);
kfree(fb_helper);
}
static const struct fb_ops exynos_drm_fb_ops = {
.owner = THIS_MODULE,
__FB_DEFAULT_DMA_OPS_RDWR,
DRM_FB_HELPER_DEFAULT_OPS,
__FB_DEFAULT_DMA_OPS_DRAW,
.fb_mmap = exynos_drm_fb_mmap,
.fb_destroy = exynos_drm_fb_destroy,
};
static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes,
struct exynos_drm_gem *exynos_gem)
{
struct fb_info *fbi;
struct drm_framebuffer *fb = helper->fb;
unsigned int size = fb->width * fb->height * fb->format->cpp[0];
unsigned long offset;
fbi = drm_fb_helper_alloc_info(helper);
if (IS_ERR(fbi)) {
DRM_DEV_ERROR(to_dma_dev(helper->dev),
"failed to allocate fb info.\n");
return PTR_ERR(fbi);
}
fbi->fbops = &exynos_drm_fb_ops;
drm_fb_helper_fill_info(fbi, helper, sizes);
offset = fbi->var.xoffset * fb->format->cpp[0];
offset += fbi->var.yoffset * fb->pitches[0];
fbi->flags |= FBINFO_VIRTFB;
fbi->screen_buffer = exynos_gem->kvaddr + offset;
fbi->screen_size = size;
fbi->fix.smem_len = size;
return 0;
}
static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
{
struct exynos_drm_gem *exynos_gem;
struct drm_device *dev = helper->dev;
struct drm_mode_fb_cmd2 mode_cmd = { 0 };
unsigned long size;
int ret;
DRM_DEV_DEBUG_KMS(dev->dev,
"surface width(%d), height(%d) and bpp(%d\n",
sizes->surface_width, sizes->surface_height,
sizes->surface_bpp);
mode_cmd.width = sizes->surface_width;
mode_cmd.height = sizes->surface_height;
mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
sizes->surface_depth);
size = mode_cmd.pitches[0] * mode_cmd.height;
exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
if (IS_ERR(exynos_gem))
return PTR_ERR(exynos_gem);
helper->fb =
exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
if (IS_ERR(helper->fb)) {
DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
ret = PTR_ERR(helper->fb);
goto err_destroy_gem;
}
ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
if (ret < 0)
goto err_destroy_framebuffer;
return 0;
err_destroy_framebuffer:
drm_framebuffer_cleanup(helper->fb);
helper->fb = NULL;
err_destroy_gem:
exynos_drm_gem_destroy(exynos_gem);
return ret;
}
static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
.fb_probe = exynos_drm_fbdev_create,
};
/*
* struct drm_client
*/
static void exynos_drm_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 exynos_drm_fbdev_client_restore(struct drm_client_dev *client)
{
drm_fb_helper_lastclose(client->dev);
return 0;
}
static int exynos_drm_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;
if (!drm_drv_uses_atomic_modeset(dev))
drm_helper_disable_unused_functions(dev);
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 exynos_drm_fbdev_client_funcs = {
.owner = THIS_MODULE,
.unregister = exynos_drm_fbdev_client_unregister,
.restore = exynos_drm_fbdev_client_restore,
.hotplug = exynos_drm_fbdev_client_hotplug,
};
void exynos_drm_fbdev_setup(struct drm_device *dev)
{
struct drm_fb_helper *fb_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");
fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
if (!fb_helper)
return;
drm_fb_helper_prepare(dev, fb_helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
ret = drm_client_init(dev, &fb_helper->client, "fbdev", &exynos_drm_fbdev_client_funcs);
if (ret)
goto err_drm_client_init;
drm_client_register(&fb_helper->client);
return;
err_drm_client_init:
drm_fb_helper_unprepare(fb_helper);
kfree(fb_helper);
}
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