1/* exynos_drm_fbdev.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Authors:
5 *	Inki Dae <inki.dae@samsung.com>
6 *	Joonyoung Shim <jy0922.shim@samsung.com>
7 *	Seung-Woo Kim <sw0312.kim@samsung.com>
8 *
9 * This program is free software; you can redistribute  it and/or modify it
10 * under  the terms of  the GNU General  Public License as published by the
11 * Free Software Foundation;  either version 2 of the  License, or (at your
12 * option) any later version.
13 */
14
15#include <drm/drmP.h>
16#include <drm/drm_crtc.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_crtc_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#include "exynos_drm_gem.h"
25#include "exynos_drm_iommu.h"
26
27#define MAX_CONNECTOR		4
28#define PREFERRED_BPP		32
29
30#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
31				drm_fb_helper)
32
33struct exynos_drm_fbdev {
34	struct drm_fb_helper		drm_fb_helper;
35	struct exynos_drm_gem_obj	*exynos_gem_obj;
36};
37
38static int exynos_drm_fb_mmap(struct fb_info *info,
39			struct vm_area_struct *vma)
40{
41	struct drm_fb_helper *helper = info->par;
42	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
43	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
44	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
45	unsigned long vm_size;
46	int ret;
47
48	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
49
50	vm_size = vma->vm_end - vma->vm_start;
51
52	if (vm_size > buffer->size)
53		return -EINVAL;
54
55	ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
56		buffer->dma_addr, buffer->size, &buffer->dma_attrs);
57	if (ret < 0) {
58		DRM_ERROR("failed to mmap.\n");
59		return ret;
60	}
61
62	return 0;
63}
64
65static struct fb_ops exynos_drm_fb_ops = {
66	.owner		= THIS_MODULE,
67	.fb_mmap        = exynos_drm_fb_mmap,
68	.fb_fillrect	= cfb_fillrect,
69	.fb_copyarea	= cfb_copyarea,
70	.fb_imageblit	= cfb_imageblit,
71	.fb_check_var	= drm_fb_helper_check_var,
72	.fb_set_par	= drm_fb_helper_set_par,
73	.fb_blank	= drm_fb_helper_blank,
74	.fb_pan_display	= drm_fb_helper_pan_display,
75	.fb_setcmap	= drm_fb_helper_setcmap,
76};
77
78static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
79				     struct drm_fb_helper_surface_size *sizes,
80				     struct drm_framebuffer *fb)
81{
82	struct fb_info *fbi = helper->fbdev;
83	struct exynos_drm_gem_buf *buffer;
84	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
85	unsigned int nr_pages;
86	unsigned long offset;
87
88	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
89	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
90
91	/* RGB formats use only one buffer */
92	buffer = exynos_drm_fb_buffer(fb, 0);
93	if (!buffer) {
94		DRM_DEBUG_KMS("buffer is null.\n");
95		return -EFAULT;
96	}
97
98	nr_pages = buffer->size >> PAGE_SHIFT;
99
100	buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
101			nr_pages, VM_MAP,
102			pgprot_writecombine(PAGE_KERNEL));
103	if (!buffer->kvaddr) {
104		DRM_ERROR("failed to map pages to kernel space.\n");
105		return -EIO;
106	}
107
108	/* buffer count to framebuffer always is 1 at booting time. */
109	exynos_drm_fb_set_buf_cnt(fb, 1);
110
111	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
112	offset += fbi->var.yoffset * fb->pitches[0];
113
114	fbi->screen_base = buffer->kvaddr + offset;
115	fbi->screen_size = size;
116	fbi->fix.smem_len = size;
117
118	return 0;
119}
120
121static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
122				    struct drm_fb_helper_surface_size *sizes)
123{
124	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
125	struct exynos_drm_gem_obj *exynos_gem_obj;
126	struct drm_device *dev = helper->dev;
127	struct fb_info *fbi;
128	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
129	struct platform_device *pdev = dev->platformdev;
130	unsigned long size;
131	int ret;
132
133	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
134			sizes->surface_width, sizes->surface_height,
135			sizes->surface_bpp);
136
137	mode_cmd.width = sizes->surface_width;
138	mode_cmd.height = sizes->surface_height;
139	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
140	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
141							  sizes->surface_depth);
142
143	mutex_lock(&dev->struct_mutex);
144
145	fbi = framebuffer_alloc(0, &pdev->dev);
146	if (!fbi) {
147		DRM_ERROR("failed to allocate fb info.\n");
148		ret = -ENOMEM;
149		goto out;
150	}
151
152	size = mode_cmd.pitches[0] * mode_cmd.height;
153
154	exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
155	/*
156	 * If physically contiguous memory allocation fails and if IOMMU is
157	 * supported then try to get buffer from non physically contiguous
158	 * memory area.
159	 */
160	if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
161		dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
162		exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
163							size);
164	}
165
166	if (IS_ERR(exynos_gem_obj)) {
167		ret = PTR_ERR(exynos_gem_obj);
168		goto err_release_framebuffer;
169	}
170
171	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
172
173	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
174			&exynos_gem_obj->base);
175	if (IS_ERR(helper->fb)) {
176		DRM_ERROR("failed to create drm framebuffer.\n");
177		ret = PTR_ERR(helper->fb);
178		goto err_destroy_gem;
179	}
180
181	helper->fbdev = fbi;
182
183	fbi->par = helper;
184	fbi->flags = FBINFO_FLAG_DEFAULT;
185	fbi->fbops = &exynos_drm_fb_ops;
186
187	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
188	if (ret) {
189		DRM_ERROR("failed to allocate cmap.\n");
190		goto err_destroy_framebuffer;
191	}
192
193	ret = exynos_drm_fbdev_update(helper, sizes, helper->fb);
194	if (ret < 0)
195		goto err_dealloc_cmap;
196
197	mutex_unlock(&dev->struct_mutex);
198	return ret;
199
200err_dealloc_cmap:
201	fb_dealloc_cmap(&fbi->cmap);
202err_destroy_framebuffer:
203	drm_framebuffer_cleanup(helper->fb);
204err_destroy_gem:
205	exynos_drm_gem_destroy(exynos_gem_obj);
206err_release_framebuffer:
207	framebuffer_release(fbi);
208
209/*
210 * if failed, all resources allocated above would be released by
211 * drm_mode_config_cleanup() when drm_load() had been called prior
212 * to any specific driver such as fimd or hdmi driver.
213 */
214out:
215	mutex_unlock(&dev->struct_mutex);
216	return ret;
217}
218
219static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
220	.fb_probe =	exynos_drm_fbdev_create,
221};
222
223static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
224{
225	struct drm_connector *connector;
226	bool ret = false;
227
228	mutex_lock(&dev->mode_config.mutex);
229	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
230		if (connector->status != connector_status_connected)
231			continue;
232
233		ret = true;
234		break;
235	}
236	mutex_unlock(&dev->mode_config.mutex);
237
238	return ret;
239}
240
241int exynos_drm_fbdev_init(struct drm_device *dev)
242{
243	struct exynos_drm_fbdev *fbdev;
244	struct exynos_drm_private *private = dev->dev_private;
245	struct drm_fb_helper *helper;
246	unsigned int num_crtc;
247	int ret;
248
249	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
250		return 0;
251
252	if (!exynos_drm_fbdev_is_anything_connected(dev))
253		return 0;
254
255	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
256	if (!fbdev)
257		return -ENOMEM;
258
259	private->fb_helper = helper = &fbdev->drm_fb_helper;
260
261	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
262
263	num_crtc = dev->mode_config.num_crtc;
264
265	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
266	if (ret < 0) {
267		DRM_ERROR("failed to initialize drm fb helper.\n");
268		goto err_init;
269	}
270
271	ret = drm_fb_helper_single_add_all_connectors(helper);
272	if (ret < 0) {
273		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
274		goto err_setup;
275
276	}
277
278	/* disable all the possible outputs/crtcs before entering KMS mode */
279	drm_helper_disable_unused_functions(dev);
280
281	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
282	if (ret < 0) {
283		DRM_ERROR("failed to set up hw configuration.\n");
284		goto err_setup;
285	}
286
287	return 0;
288
289err_setup:
290	drm_fb_helper_fini(helper);
291
292err_init:
293	private->fb_helper = NULL;
294	kfree(fbdev);
295
296	return ret;
297}
298
299static void exynos_drm_fbdev_destroy(struct drm_device *dev,
300				      struct drm_fb_helper *fb_helper)
301{
302	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
303	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
304	struct drm_framebuffer *fb;
305
306	if (exynos_gem_obj->buffer->kvaddr)
307		vunmap(exynos_gem_obj->buffer->kvaddr);
308
309	/* release drm framebuffer and real buffer */
310	if (fb_helper->fb && fb_helper->fb->funcs) {
311		fb = fb_helper->fb;
312		if (fb) {
313			drm_framebuffer_unregister_private(fb);
314			drm_framebuffer_remove(fb);
315		}
316	}
317
318	/* release linux framebuffer */
319	if (fb_helper->fbdev) {
320		struct fb_info *info;
321		int ret;
322
323		info = fb_helper->fbdev;
324		ret = unregister_framebuffer(info);
325		if (ret < 0)
326			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
327
328		if (info->cmap.len)
329			fb_dealloc_cmap(&info->cmap);
330
331		framebuffer_release(info);
332	}
333
334	drm_fb_helper_fini(fb_helper);
335}
336
337void exynos_drm_fbdev_fini(struct drm_device *dev)
338{
339	struct exynos_drm_private *private = dev->dev_private;
340	struct exynos_drm_fbdev *fbdev;
341
342	if (!private || !private->fb_helper)
343		return;
344
345	fbdev = to_exynos_fbdev(private->fb_helper);
346
347	exynos_drm_fbdev_destroy(dev, private->fb_helper);
348	kfree(fbdev);
349	private->fb_helper = NULL;
350}
351
352void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
353{
354	struct exynos_drm_private *private = dev->dev_private;
355
356	if (!private || !private->fb_helper)
357		return;
358
359	drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
360}
361