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#include <drm/drm_framebuffer.h>
 12#include <drm/drm_prime.h>
 13
 14#include "msm_drv.h"
 15#include "msm_gem.h"
 16#include "msm_kms.h"
 17
 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
 52	return drm_gem_prime_mmap(bo, vma);
 53}
 54
 55static int msm_fbdev_create(struct drm_fb_helper *helper,
 56		struct drm_fb_helper_surface_size *sizes)
 57{
 58	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
 59	struct drm_device *dev = helper->dev;
 60	struct msm_drm_private *priv = dev->dev_private;
 61	struct drm_framebuffer *fb = NULL;
 62	struct drm_gem_object *bo;
 63	struct fb_info *fbi = NULL;
 64	uint64_t paddr;
 65	uint32_t format;
 66	int ret, pitch;
 67
 68	format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
 69
 70	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 71			sizes->surface_height, sizes->surface_bpp,
 72			sizes->fb_width, sizes->fb_height);
 73
 74	pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
 75	fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
 76			sizes->surface_height, pitch, format);
 77
 78	if (IS_ERR(fb)) {
 79		DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 80		return PTR_ERR(fb);
 81	}
 82
 83	bo = msm_framebuffer_bo(fb, 0);
 84
 85	/*
 86	 * NOTE: if we can be guaranteed to be able to map buffer
 87	 * in panic (ie. lock-safe, etc) we could avoid pinning the
 88	 * buffer now:
 89	 */
 90	ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
 91	if (ret) {
 92		DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 93		goto fail;
 94	}
 95
 96	fbi = drm_fb_helper_alloc_info(helper);
 97	if (IS_ERR(fbi)) {
 98		DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 99		ret = PTR_ERR(fbi);
100		goto fail;
101	}
102
103	DBG("fbi=%p, dev=%p", fbi, dev);
104
105	fbdev->fb = fb;
106	helper->fb = fb;
107
108	fbi->fbops = &msm_fb_ops;
109
110	drm_fb_helper_fill_info(fbi, helper, sizes);
111
112	fbi->screen_base = msm_gem_get_vaddr(bo);
113	if (IS_ERR(fbi->screen_base)) {
114		ret = PTR_ERR(fbi->screen_base);
115		goto fail;
116	}
117	fbi->screen_size = bo->size;
118	fbi->fix.smem_start = paddr;
119	fbi->fix.smem_len = bo->size;
120
121	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
122	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
123
124	return 0;
125
126fail:
127	drm_framebuffer_remove(fb);
128	return ret;
129}
130
131static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
132	.fb_probe = msm_fbdev_create,
133};
134
135/* initialize fbdev helper */
136struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
137{
138	struct msm_drm_private *priv = dev->dev_private;
139	struct msm_fbdev *fbdev = NULL;
140	struct drm_fb_helper *helper;
141	int ret;
142
143	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
144	if (!fbdev)
145		goto fail;
146
147	helper = &fbdev->base;
148
149	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
150
151	ret = drm_fb_helper_init(dev, helper);
152	if (ret) {
153		DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
154		goto fail;
155	}
156
157	/* the fw fb could be anywhere in memory */
158	ret = drm_aperture_remove_framebuffers(false, dev->driver);
159	if (ret)
160		goto fini;
161
162	ret = drm_fb_helper_initial_config(helper, 32);
163	if (ret)
164		goto fini;
165
166	priv->fbdev = helper;
167
168	return helper;
169
170fini:
171	drm_fb_helper_fini(helper);
172fail:
173	kfree(fbdev);
174	return NULL;
175}
176
177void msm_fbdev_free(struct drm_device *dev)
178{
179	struct msm_drm_private *priv = dev->dev_private;
180	struct drm_fb_helper *helper = priv->fbdev;
181	struct msm_fbdev *fbdev;
182
183	DBG();
184
185	drm_fb_helper_unregister_info(helper);
186
187	drm_fb_helper_fini(helper);
188
189	fbdev = to_msm_fbdev(priv->fbdev);
190
191	/* this will free the backing object */
192	if (fbdev->fb) {
193		struct drm_gem_object *bo =
194			msm_framebuffer_bo(fbdev->fb, 0);
195		msm_gem_put_vaddr(bo);
196		drm_framebuffer_remove(fbdev->fb);
197	}
198
199	kfree(fbdev);
200
201	priv->fbdev = NULL;
202}