exynos_drm_fbdev.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* exynos_drm_fbdev.c
  3 *
  4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  5 * Authors:
  6 *	Inki Dae <inki.dae@samsung.com>
  7 *	Joonyoung Shim <jy0922.shim@samsung.com>
  8 *	Seung-Woo Kim <sw0312.kim@samsung.com>
  9 */
 10
 11#include <linux/fb.h>
 12
 13#include <drm/drm_crtc_helper.h>
 14#include <drm/drm_drv.h>
 15#include <drm/drm_fb_helper.h>
 16#include <drm/drm_framebuffer.h>
 17#include <drm/drm_gem_framebuffer_helper.h>
 18#include <drm/drm_prime.h>
 19#include <drm/drm_print.h>
 20#include <drm/exynos_drm.h>
 21
 22#include "exynos_drm_drv.h"
 23#include "exynos_drm_fb.h"
 24#include "exynos_drm_fbdev.h"
 25
 26#define MAX_CONNECTOR		4
 27
 28static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 29{
 30	struct drm_fb_helper *helper = info->par;
 31	struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0);
 32
 33	return drm_gem_prime_mmap(obj, vma);
 34}
 35
 36static void exynos_drm_fb_destroy(struct fb_info *info)
 37{
 38	struct drm_fb_helper *fb_helper = info->par;
 39	struct drm_framebuffer *fb = fb_helper->fb;
 40
 41	drm_fb_helper_fini(fb_helper);
 42
 43	drm_framebuffer_remove(fb);
 44
 45	drm_client_release(&fb_helper->client);
 46}
 47
 48static const struct fb_ops exynos_drm_fb_ops = {
 49	.owner		= THIS_MODULE,
 50	__FB_DEFAULT_DMAMEM_OPS_RDWR,
 51	DRM_FB_HELPER_DEFAULT_OPS,
 52	__FB_DEFAULT_DMAMEM_OPS_DRAW,
 53	.fb_mmap        = exynos_drm_fb_mmap,
 54	.fb_destroy	= exynos_drm_fb_destroy,
 55};
 56
 57static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 58				   struct drm_fb_helper_surface_size *sizes,
 59				   struct exynos_drm_gem *exynos_gem)
 60{
 61	struct fb_info *fbi = helper->info;
 62	struct drm_framebuffer *fb = helper->fb;
 63	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
 64	unsigned long offset;
 65
 66	fbi->fbops = &exynos_drm_fb_ops;
 67
 68	drm_fb_helper_fill_info(fbi, helper, sizes);
 69
 70	offset = fbi->var.xoffset * fb->format->cpp[0];
 71	offset += fbi->var.yoffset * fb->pitches[0];
 72
 73	fbi->flags |= FBINFO_VIRTFB;
 74	fbi->screen_buffer = exynos_gem->kvaddr + offset;
 75	fbi->screen_size = size;
 76	fbi->fix.smem_len = size;
 77
 78	return 0;
 79}
 80
 81static const struct drm_fb_helper_funcs exynos_drm_fbdev_helper_funcs = {
 82};
 83
 84int exynos_drm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
 85					struct drm_fb_helper_surface_size *sizes)
 86{
 87	struct exynos_drm_gem *exynos_gem;
 88	struct drm_device *dev = helper->dev;
 89	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 90	unsigned long size;
 91	int ret;
 92
 93	DRM_DEV_DEBUG_KMS(dev->dev,
 94			  "surface width(%d), height(%d) and bpp(%d\n",
 95			  sizes->surface_width, sizes->surface_height,
 96			  sizes->surface_bpp);
 97
 98	mode_cmd.width = sizes->surface_width;
 99	mode_cmd.height = sizes->surface_height;
100	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
101	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
102							  sizes->surface_depth);
103
104	size = mode_cmd.pitches[0] * mode_cmd.height;
105
106	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
107	if (IS_ERR(exynos_gem))
108		return PTR_ERR(exynos_gem);
109
110	helper->fb =
111		exynos_drm_framebuffer_init(dev,
112					    drm_get_format_info(dev, mode_cmd.pixel_format,
113								mode_cmd.modifier[0]),
114					    &mode_cmd, &exynos_gem, 1);
115	if (IS_ERR(helper->fb)) {
116		DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
117		ret = PTR_ERR(helper->fb);
118		goto err_destroy_gem;
119	}
120	helper->funcs = &exynos_drm_fbdev_helper_funcs;
121
122	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
123	if (ret < 0)
124		goto err_destroy_framebuffer;
125
126	return 0;
127
128err_destroy_framebuffer:
129	drm_framebuffer_cleanup(helper->fb);
130	helper->fb = NULL;
131err_destroy_gem:
132	exynos_drm_gem_destroy(exynos_gem);
133	return ret;
134}