1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2013 Red Hat
  4 * Author: Rob Clark <robdclark@gmail.com>
  5 */
  6
  7#include <drm/drm_aperture.h>
  8#include <drm/drm_crtc.h>
  9#include <drm/drm_fb_helper.h>
 10#include <drm/drm_fourcc.h>
 11
 12#include "msm_drv.h"
 13#include "msm_gem.h"
 14#include "msm_kms.h"
 15
 16extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
 17					struct vm_area_struct *vma);
 18static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
 19
 20/*
 21 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
 22 */
 23
 24#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
 25
 26struct msm_fbdev {
 27	struct drm_fb_helper base;
 28	struct drm_framebuffer *fb;
 29};
 30
 31static const struct fb_ops msm_fb_ops = {
 32	.owner = THIS_MODULE,
 33	DRM_FB_HELPER_DEFAULT_OPS,
 34
 35	/* Note: to properly handle manual update displays, we wrap the
 36	 * basic fbdev ops which write to the framebuffer
 37	 */
 38	.fb_read = drm_fb_helper_sys_read,
 39	.fb_write = drm_fb_helper_sys_write,
 40	.fb_fillrect = drm_fb_helper_sys_fillrect,
 41	.fb_copyarea = drm_fb_helper_sys_copyarea,
 42	.fb_imageblit = drm_fb_helper_sys_imageblit,
 43	.fb_mmap = msm_fbdev_mmap,
 44};
 45
 46static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 47{
 48	struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
 49	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
 50	struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
 51	int ret = 0;
 52
 53	ret = drm_gem_mmap_obj(bo, bo->size, vma);
 54	if (ret) {
 55		pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
 56		return ret;
 57	}
 58
 59	return msm_gem_mmap_obj(bo, vma);
 60}
 61
 62static int msm_fbdev_create(struct drm_fb_helper *helper,
 63		struct drm_fb_helper_surface_size *sizes)
 64{
 65	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
 66	struct drm_device *dev = helper->dev;
 67	struct msm_drm_private *priv = dev->dev_private;
 68	struct drm_framebuffer *fb = NULL;
 69	struct drm_gem_object *bo;
 70	struct fb_info *fbi = NULL;
 71	uint64_t paddr;
 72	uint32_t format;
 73	int ret, pitch;
 74
 75	format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
 76
 77	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 78			sizes->surface_height, sizes->surface_bpp,
 79			sizes->fb_width, sizes->fb_height);
 80
 81	pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
 82	fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
 83			sizes->surface_height, pitch, format);
 84
 85	if (IS_ERR(fb)) {
 86		DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 87		return PTR_ERR(fb);
 88	}
 89
 90	bo = msm_framebuffer_bo(fb, 0);
 91
 92	mutex_lock(&dev->struct_mutex);
 93
 94	/*
 95	 * NOTE: if we can be guaranteed to be able to map buffer
 96	 * in panic (ie. lock-safe, etc) we could avoid pinning the
 97	 * buffer now:
 98	 */
 99	ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
100	if (ret) {
101		DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
102		goto fail_unlock;
103	}
104
105	fbi = drm_fb_helper_alloc_fbi(helper);
106	if (IS_ERR(fbi)) {
107		DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
108		ret = PTR_ERR(fbi);
109		goto fail_unlock;
110	}
111
112	DBG("fbi=%p, dev=%p", fbi, dev);
113
114	fbdev->fb = fb;
115	helper->fb = fb;
116
117	fbi->fbops = &msm_fb_ops;
118
119	drm_fb_helper_fill_info(fbi, helper, sizes);
120
121	dev->mode_config.fb_base = paddr;
122
123	fbi->screen_base = msm_gem_get_vaddr(bo);
124	if (IS_ERR(fbi->screen_base)) {
125		ret = PTR_ERR(fbi->screen_base);
126		goto fail_unlock;
127	}
128	fbi->screen_size = bo->size;
129	fbi->fix.smem_start = paddr;
130	fbi->fix.smem_len = bo->size;
131
132	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
133	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
134
135	mutex_unlock(&dev->struct_mutex);
136
137	return 0;
138
139fail_unlock:
140	mutex_unlock(&dev->struct_mutex);
141	drm_framebuffer_remove(fb);
142	return ret;
143}
144
145static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
146	.fb_probe = msm_fbdev_create,
147};
148
149/* initialize fbdev helper */
150struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
151{
152	struct msm_drm_private *priv = dev->dev_private;
153	struct msm_fbdev *fbdev = NULL;
154	struct drm_fb_helper *helper;
155	int ret;
156
157	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
158	if (!fbdev)
159		goto fail;
160
161	helper = &fbdev->base;
162
163	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
164
165	ret = drm_fb_helper_init(dev, helper);
166	if (ret) {
167		DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
168		goto fail;
169	}
170
171	/* the fw fb could be anywhere in memory */
172	ret = drm_aperture_remove_framebuffers(false, "msm");
173	if (ret)
174		goto fini;
175
176	ret = drm_fb_helper_initial_config(helper, 32);
177	if (ret)
178		goto fini;
179
180	priv->fbdev = helper;
181
182	return helper;
183
184fini:
185	drm_fb_helper_fini(helper);
186fail:
187	kfree(fbdev);
188	return NULL;
189}
190
191void msm_fbdev_free(struct drm_device *dev)
192{
193	struct msm_drm_private *priv = dev->dev_private;
194	struct drm_fb_helper *helper = priv->fbdev;
195	struct msm_fbdev *fbdev;
196
197	DBG();
198
199	drm_fb_helper_unregister_fbi(helper);
200
201	drm_fb_helper_fini(helper);
202
203	fbdev = to_msm_fbdev(priv->fbdev);
204
205	/* this will free the backing object */
206	if (fbdev->fb) {
207		struct drm_gem_object *bo =
208			msm_framebuffer_bo(fbdev->fb, 0);
209		msm_gem_put_vaddr(bo);
210		drm_framebuffer_remove(fbdev->fb);
211	}
212
213	kfree(fbdev);
214
215	priv->fbdev = NULL;
216}