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1/*
2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include "msm_drv.h"
19
20#include "drm_crtc.h"
21#include "drm_fb_helper.h"
22#include "msm_gem.h"
23
24extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
25 struct vm_area_struct *vma);
26static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
27
28/*
29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
30 */
31
32#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
33
34struct msm_fbdev {
35 struct drm_fb_helper base;
36 struct drm_framebuffer *fb;
37 struct drm_gem_object *bo;
38};
39
40static struct fb_ops msm_fb_ops = {
41 .owner = THIS_MODULE,
42
43 /* Note: to properly handle manual update displays, we wrap the
44 * basic fbdev ops which write to the framebuffer
45 */
46 .fb_read = drm_fb_helper_sys_read,
47 .fb_write = drm_fb_helper_sys_write,
48 .fb_fillrect = drm_fb_helper_sys_fillrect,
49 .fb_copyarea = drm_fb_helper_sys_copyarea,
50 .fb_imageblit = drm_fb_helper_sys_imageblit,
51 .fb_mmap = msm_fbdev_mmap,
52
53 .fb_check_var = drm_fb_helper_check_var,
54 .fb_set_par = drm_fb_helper_set_par,
55 .fb_pan_display = drm_fb_helper_pan_display,
56 .fb_blank = drm_fb_helper_blank,
57 .fb_setcmap = drm_fb_helper_setcmap,
58};
59
60static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
61{
62 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
63 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
64 struct drm_gem_object *drm_obj = fbdev->bo;
65 int ret = 0;
66
67 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
68 if (ret) {
69 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
70 return ret;
71 }
72
73 return msm_gem_mmap_obj(drm_obj, vma);
74}
75
76static int msm_fbdev_create(struct drm_fb_helper *helper,
77 struct drm_fb_helper_surface_size *sizes)
78{
79 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
80 struct drm_device *dev = helper->dev;
81 struct drm_framebuffer *fb = NULL;
82 struct fb_info *fbi = NULL;
83 struct drm_mode_fb_cmd2 mode_cmd = {0};
84 uint32_t paddr;
85 int ret, size;
86
87 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
88 sizes->surface_height, sizes->surface_bpp,
89 sizes->fb_width, sizes->fb_height);
90
91 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
92 sizes->surface_depth);
93
94 mode_cmd.width = sizes->surface_width;
95 mode_cmd.height = sizes->surface_height;
96
97 mode_cmd.pitches[0] = align_pitch(
98 mode_cmd.width, sizes->surface_bpp);
99
100 /* allocate backing bo */
101 size = mode_cmd.pitches[0] * mode_cmd.height;
102 DBG("allocating %d bytes for fb %d", size, dev->primary->index);
103 mutex_lock(&dev->struct_mutex);
104 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
105 MSM_BO_WC | MSM_BO_STOLEN);
106 mutex_unlock(&dev->struct_mutex);
107 if (IS_ERR(fbdev->bo)) {
108 ret = PTR_ERR(fbdev->bo);
109 fbdev->bo = NULL;
110 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
111 goto fail;
112 }
113
114 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
115 if (IS_ERR(fb)) {
116 dev_err(dev->dev, "failed to allocate fb\n");
117 /* note: if fb creation failed, we can't rely on fb destroy
118 * to unref the bo:
119 */
120 drm_gem_object_unreference_unlocked(fbdev->bo);
121 ret = PTR_ERR(fb);
122 goto fail;
123 }
124
125 mutex_lock(&dev->struct_mutex);
126
127 /*
128 * NOTE: if we can be guaranteed to be able to map buffer
129 * in panic (ie. lock-safe, etc) we could avoid pinning the
130 * buffer now:
131 */
132 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
133 if (ret) {
134 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
135 goto fail_unlock;
136 }
137
138 fbi = drm_fb_helper_alloc_fbi(helper);
139 if (IS_ERR(fbi)) {
140 dev_err(dev->dev, "failed to allocate fb info\n");
141 ret = PTR_ERR(fbi);
142 goto fail_unlock;
143 }
144
145 DBG("fbi=%p, dev=%p", fbi, dev);
146
147 fbdev->fb = fb;
148 helper->fb = fb;
149
150 fbi->par = helper;
151 fbi->flags = FBINFO_DEFAULT;
152 fbi->fbops = &msm_fb_ops;
153
154 strcpy(fbi->fix.id, "msm");
155
156 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
157 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
158
159 dev->mode_config.fb_base = paddr;
160
161 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
162 fbi->screen_size = fbdev->bo->size;
163 fbi->fix.smem_start = paddr;
164 fbi->fix.smem_len = fbdev->bo->size;
165
166 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
167 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
168
169 mutex_unlock(&dev->struct_mutex);
170
171 return 0;
172
173fail_unlock:
174 mutex_unlock(&dev->struct_mutex);
175fail:
176
177 if (ret) {
178 if (fb) {
179 drm_framebuffer_unregister_private(fb);
180 drm_framebuffer_remove(fb);
181 }
182 }
183
184 return ret;
185}
186
187static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
188 u16 red, u16 green, u16 blue, int regno)
189{
190 DBG("fbdev: set gamma");
191}
192
193static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
194 u16 *red, u16 *green, u16 *blue, int regno)
195{
196 DBG("fbdev: get gamma");
197}
198
199static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
200 .gamma_set = msm_crtc_fb_gamma_set,
201 .gamma_get = msm_crtc_fb_gamma_get,
202 .fb_probe = msm_fbdev_create,
203};
204
205/* initialize fbdev helper */
206struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
207{
208 struct msm_drm_private *priv = dev->dev_private;
209 struct msm_fbdev *fbdev = NULL;
210 struct drm_fb_helper *helper;
211 int ret;
212
213 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
214 if (!fbdev)
215 goto fail;
216
217 helper = &fbdev->base;
218
219 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
220
221 ret = drm_fb_helper_init(dev, helper,
222 priv->num_crtcs, priv->num_connectors);
223 if (ret) {
224 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
225 goto fail;
226 }
227
228 ret = drm_fb_helper_single_add_all_connectors(helper);
229 if (ret)
230 goto fini;
231
232 ret = drm_fb_helper_initial_config(helper, 32);
233 if (ret)
234 goto fini;
235
236 priv->fbdev = helper;
237
238 return helper;
239
240fini:
241 drm_fb_helper_fini(helper);
242fail:
243 kfree(fbdev);
244 return NULL;
245}
246
247void msm_fbdev_free(struct drm_device *dev)
248{
249 struct msm_drm_private *priv = dev->dev_private;
250 struct drm_fb_helper *helper = priv->fbdev;
251 struct msm_fbdev *fbdev;
252
253 DBG();
254
255 drm_fb_helper_unregister_fbi(helper);
256 drm_fb_helper_release_fbi(helper);
257
258 drm_fb_helper_fini(helper);
259
260 fbdev = to_msm_fbdev(priv->fbdev);
261
262 /* this will free the backing object */
263 if (fbdev->fb) {
264 drm_framebuffer_unregister_private(fbdev->fb);
265 drm_framebuffer_remove(fbdev->fb);
266 }
267
268 kfree(fbdev);
269
270 priv->fbdev = NULL;
271}
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}