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/console.h>
 12#include <linux/dma-mapping.h>
 13#include <linux/vmalloc.h>
 14
 15#include <drm/drm_crtc.h>
 16#include <drm/drm_fb_helper.h>
 17#include <drm/drm_fourcc.h>
 18#include <drm/drm_probe_helper.h>
 19#include <drm/exynos_drm.h>
 20
 21#include "exynos_drm_drv.h"
 22#include "exynos_drm_fb.h"
 23#include "exynos_drm_fbdev.h"
 24
 25#define MAX_CONNECTOR		4
 26#define PREFERRED_BPP		32
 27
 28#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
 29				drm_fb_helper)
 30
 31struct exynos_drm_fbdev {
 32	struct drm_fb_helper	drm_fb_helper;
 33	struct exynos_drm_gem	*exynos_gem;
 34};
 35
 36static int exynos_drm_fb_mmap(struct fb_info *info,
 37			struct vm_area_struct *vma)
 38{
 39	struct drm_fb_helper *helper = info->par;
 40	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
 41	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 42	unsigned long vm_size;
 43	int ret;
 44
 45	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 46
 47	vm_size = vma->vm_end - vma->vm_start;
 48
 49	if (vm_size > exynos_gem->size)
 50		return -EINVAL;
 51
 52	ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
 53			     exynos_gem->dma_addr, exynos_gem->size,
 54			     exynos_gem->dma_attrs);
 55	if (ret < 0) {
 56		DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
 57		return ret;
 58	}
 59
 60	return 0;
 61}
 62
 63static struct fb_ops exynos_drm_fb_ops = {
 64	.owner		= THIS_MODULE,
 65	DRM_FB_HELPER_DEFAULT_OPS,
 66	.fb_mmap        = exynos_drm_fb_mmap,
 67	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
 68	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
 69	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
 70};
 71
 72static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 73				   struct drm_fb_helper_surface_size *sizes,
 74				   struct exynos_drm_gem *exynos_gem)
 75{
 76	struct fb_info *fbi;
 77	struct drm_framebuffer *fb = helper->fb;
 78	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
 79	unsigned int nr_pages;
 80	unsigned long offset;
 81
 82	fbi = drm_fb_helper_alloc_fbi(helper);
 83	if (IS_ERR(fbi)) {
 84		DRM_DEV_ERROR(to_dma_dev(helper->dev),
 85			      "failed to allocate fb info.\n");
 86		return PTR_ERR(fbi);
 87	}
 88
 89	fbi->fbops = &exynos_drm_fb_ops;
 90
 91	drm_fb_helper_fill_info(fbi, helper, sizes);
 92
 93	nr_pages = exynos_gem->size >> PAGE_SHIFT;
 94
 95	exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
 96				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 97	if (!exynos_gem->kvaddr) {
 98		DRM_DEV_ERROR(to_dma_dev(helper->dev),
 99			      "failed to map pages to kernel space.\n");
100		return -EIO;
101	}
102
103	offset = fbi->var.xoffset * fb->format->cpp[0];
104	offset += fbi->var.yoffset * fb->pitches[0];
105
106	fbi->screen_base = exynos_gem->kvaddr + offset;
107	fbi->screen_size = size;
108	fbi->fix.smem_len = size;
109
110	return 0;
111}
112
113static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
114				    struct drm_fb_helper_surface_size *sizes)
115{
116	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
117	struct exynos_drm_gem *exynos_gem;
118	struct drm_device *dev = helper->dev;
119	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
120	unsigned long size;
121	int ret;
122
123	DRM_DEV_DEBUG_KMS(dev->dev,
124			  "surface width(%d), height(%d) and bpp(%d\n",
125			  sizes->surface_width, sizes->surface_height,
126			  sizes->surface_bpp);
127
128	mode_cmd.width = sizes->surface_width;
129	mode_cmd.height = sizes->surface_height;
130	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
131	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
132							  sizes->surface_depth);
133
134	size = mode_cmd.pitches[0] * mode_cmd.height;
135
136	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
137	/*
138	 * If physically contiguous memory allocation fails and if IOMMU is
139	 * supported then try to get buffer from non physically contiguous
140	 * memory area.
141	 */
142	if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
143		dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
144		exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
145						   size);
146	}
147
148	if (IS_ERR(exynos_gem))
149		return PTR_ERR(exynos_gem);
150
151	exynos_fbdev->exynos_gem = exynos_gem;
152
153	helper->fb =
154		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
155	if (IS_ERR(helper->fb)) {
156		DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
157		ret = PTR_ERR(helper->fb);
158		goto err_destroy_gem;
159	}
160
161	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
162	if (ret < 0)
163		goto err_destroy_framebuffer;
164
165	return ret;
166
167err_destroy_framebuffer:
168	drm_framebuffer_cleanup(helper->fb);
169err_destroy_gem:
170	exynos_drm_gem_destroy(exynos_gem);
171
172	/*
173	 * if failed, all resources allocated above would be released by
174	 * drm_mode_config_cleanup() when drm_load() had been called prior
175	 * to any specific driver such as fimd or hdmi driver.
176	 */
177
178	return ret;
179}
180
181static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
182	.fb_probe =	exynos_drm_fbdev_create,
183};
184
185int exynos_drm_fbdev_init(struct drm_device *dev)
186{
187	struct exynos_drm_fbdev *fbdev;
188	struct exynos_drm_private *private = dev->dev_private;
189	struct drm_fb_helper *helper;
190	int ret;
191
192	if (!dev->mode_config.num_crtc)
193		return 0;
194
195	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
196	if (!fbdev)
197		return -ENOMEM;
198
199	private->fb_helper = helper = &fbdev->drm_fb_helper;
200
201	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
202
203	ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
204	if (ret < 0) {
205		DRM_DEV_ERROR(dev->dev,
206			      "failed to initialize drm fb helper.\n");
207		goto err_init;
208	}
209
210	ret = drm_fb_helper_single_add_all_connectors(helper);
211	if (ret < 0) {
212		DRM_DEV_ERROR(dev->dev,
213			      "failed to register drm_fb_helper_connector.\n");
214		goto err_setup;
215
216	}
217
218	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
219	if (ret < 0) {
220		DRM_DEV_ERROR(dev->dev,
221			      "failed to set up hw configuration.\n");
222		goto err_setup;
223	}
224
225	return 0;
226
227err_setup:
228	drm_fb_helper_fini(helper);
229
230err_init:
231	private->fb_helper = NULL;
232	kfree(fbdev);
233
234	return ret;
235}
236
237static void exynos_drm_fbdev_destroy(struct drm_device *dev,
238				      struct drm_fb_helper *fb_helper)
239{
240	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
241	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
242	struct drm_framebuffer *fb;
243
244	vunmap(exynos_gem->kvaddr);
245
246	/* release drm framebuffer and real buffer */
247	if (fb_helper->fb && fb_helper->fb->funcs) {
248		fb = fb_helper->fb;
249		if (fb)
250			drm_framebuffer_remove(fb);
251	}
252
253	drm_fb_helper_unregister_fbi(fb_helper);
254
255	drm_fb_helper_fini(fb_helper);
256}
257
258void exynos_drm_fbdev_fini(struct drm_device *dev)
259{
260	struct exynos_drm_private *private = dev->dev_private;
261	struct exynos_drm_fbdev *fbdev;
262
263	if (!private || !private->fb_helper)
264		return;
265
266	fbdev = to_exynos_fbdev(private->fb_helper);
267
268	exynos_drm_fbdev_destroy(dev, private->fb_helper);
269	kfree(fbdev);
270	private->fb_helper = NULL;
271}
272