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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
4 * Author: Rob Clark <rob@ti.com>
5 */
6
7#include <linux/fb.h>
8
9#include <drm/drm_client_setup.h>
10#include <drm/drm_drv.h>
11#include <drm/drm_crtc_helper.h>
12#include <drm/drm_fb_helper.h>
13#include <drm/drm_file.h>
14#include <drm/drm_fourcc.h>
15#include <drm/drm_framebuffer.h>
16#include <drm/drm_gem_framebuffer_helper.h>
17#include <drm/drm_managed.h>
18#include <drm/drm_util.h>
19
20#include "omap_drv.h"
21#include "omap_fbdev.h"
22
23MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
24static bool ywrap_enabled = true;
25module_param_named(ywrap, ywrap_enabled, bool, 0644);
26
27/*
28 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
29 */
30
31struct omap_fbdev {
32 struct drm_device *dev;
33 bool ywrap_enabled;
34
35 /* for deferred dmm roll when getting called in atomic ctx */
36 struct work_struct work;
37};
38
39static struct drm_fb_helper *get_fb(struct fb_info *fbi);
40
41static void pan_worker(struct work_struct *work)
42{
43 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
44 struct drm_fb_helper *helper = fbdev->dev->fb_helper;
45 struct fb_info *fbi = helper->info;
46 struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0);
47 int npages;
48
49 /* DMM roll shifts in 4K pages: */
50 npages = fbi->fix.line_length >> PAGE_SHIFT;
51 omap_gem_roll(bo, fbi->var.yoffset * npages);
52}
53
54FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev,
55 drm_fb_helper_damage_range,
56 drm_fb_helper_damage_area)
57
58static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
59{
60 struct drm_fb_helper *helper = get_fb(fbi);
61 struct omap_drm_private *priv;
62 struct omap_fbdev *fbdev;
63
64 if (!helper)
65 goto fallback;
66
67 priv = helper->dev->dev_private;
68 fbdev = priv->fbdev;
69
70 if (!fbdev->ywrap_enabled)
71 goto fallback;
72
73 if (drm_can_sleep())
74 pan_worker(&fbdev->work);
75 else
76 queue_work(priv->wq, &fbdev->work);
77
78 return 0;
79
80fallback:
81 return drm_fb_helper_pan_display(var, fbi);
82}
83
84static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
85{
86 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
87
88 return fb_deferred_io_mmap(info, vma);
89}
90
91static void omap_fbdev_fb_destroy(struct fb_info *info)
92{
93 struct drm_fb_helper *helper = info->par;
94 struct drm_framebuffer *fb = helper->fb;
95 struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0);
96
97 DBG();
98
99 fb_deferred_io_cleanup(info);
100 drm_fb_helper_fini(helper);
101
102 omap_gem_unpin(bo);
103 drm_framebuffer_remove(fb);
104
105 drm_client_release(&helper->client);
106 drm_fb_helper_unprepare(helper);
107 kfree(helper);
108}
109
110/*
111 * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap()
112 * because we use write-combine.
113 */
114static const struct fb_ops omap_fb_ops = {
115 .owner = THIS_MODULE,
116 __FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev),
117 .fb_check_var = drm_fb_helper_check_var,
118 .fb_set_par = drm_fb_helper_set_par,
119 .fb_setcmap = drm_fb_helper_setcmap,
120 .fb_blank = drm_fb_helper_blank,
121 .fb_pan_display = omap_fbdev_pan_display,
122 __FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev),
123 .fb_ioctl = drm_fb_helper_ioctl,
124 .fb_mmap = omap_fbdev_fb_mmap,
125 .fb_destroy = omap_fbdev_fb_destroy,
126};
127
128static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
129{
130 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
131 return 0;
132
133 if (helper->fb->funcs->dirty)
134 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
135
136 return 0;
137}
138
139static const struct drm_fb_helper_funcs omap_fbdev_helper_funcs = {
140 .fb_dirty = omap_fbdev_dirty,
141};
142
143static struct drm_fb_helper *get_fb(struct fb_info *fbi)
144{
145 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
146 /* these are not the fb's you're looking for */
147 return NULL;
148 }
149 return fbi->par;
150}
151
152int omap_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
153 struct drm_fb_helper_surface_size *sizes)
154{
155 struct drm_device *dev = helper->dev;
156 struct omap_drm_private *priv = dev->dev_private;
157 struct omap_fbdev *fbdev = priv->fbdev;
158 struct drm_framebuffer *fb = NULL;
159 union omap_gem_size gsize;
160 struct fb_info *fbi = NULL;
161 struct drm_mode_fb_cmd2 mode_cmd = {0};
162 struct drm_gem_object *bo;
163 dma_addr_t dma_addr;
164 int ret;
165
166 sizes->surface_bpp = 32;
167 sizes->surface_depth = 24;
168
169 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
170 sizes->surface_height, sizes->surface_bpp,
171 sizes->fb_width, sizes->fb_height);
172
173 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
174 sizes->surface_depth);
175
176 mode_cmd.width = sizes->surface_width;
177 mode_cmd.height = sizes->surface_height;
178
179 mode_cmd.pitches[0] =
180 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
181
182 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
183 if (fbdev->ywrap_enabled) {
184 /* need to align pitch to page size if using DMM scrolling */
185 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
186 }
187
188 /* allocate backing bo */
189 gsize = (union omap_gem_size){
190 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
191 };
192 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
193 bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
194 if (!bo) {
195 dev_err(dev->dev, "failed to allocate buffer object\n");
196 ret = -ENOMEM;
197 goto fail;
198 }
199
200 fb = omap_framebuffer_init(dev, &mode_cmd, &bo);
201 if (IS_ERR(fb)) {
202 dev_err(dev->dev, "failed to allocate fb\n");
203 /* note: if fb creation failed, we can't rely on fb destroy
204 * to unref the bo:
205 */
206 drm_gem_object_put(bo);
207 ret = PTR_ERR(fb);
208 goto fail;
209 }
210
211 /* note: this keeps the bo pinned.. which is perhaps not ideal,
212 * but is needed as long as we use fb_mmap() to mmap to userspace
213 * (since this happens using fix.smem_start). Possibly we could
214 * implement our own mmap using GEM mmap support to avoid this
215 * (non-tiled buffer doesn't need to be pinned for fbcon to write
216 * to it). Then we just need to be sure that we are able to re-
217 * pin it in case of an opps.
218 */
219 ret = omap_gem_pin(bo, &dma_addr);
220 if (ret) {
221 dev_err(dev->dev, "could not pin framebuffer\n");
222 ret = -ENOMEM;
223 goto fail;
224 }
225
226 fbi = drm_fb_helper_alloc_info(helper);
227 if (IS_ERR(fbi)) {
228 dev_err(dev->dev, "failed to allocate fb info\n");
229 ret = PTR_ERR(fbi);
230 goto fail;
231 }
232
233 DBG("fbi=%p, dev=%p", fbi, dev);
234
235 helper->funcs = &omap_fbdev_helper_funcs;
236 helper->fb = fb;
237
238 fbi->fbops = &omap_fb_ops;
239
240 drm_fb_helper_fill_info(fbi, helper, sizes);
241
242 fbi->flags |= FBINFO_VIRTFB;
243 fbi->screen_buffer = omap_gem_vaddr(bo);
244 fbi->screen_size = bo->size;
245 fbi->fix.smem_start = dma_addr;
246 fbi->fix.smem_len = bo->size;
247
248 /* deferred I/O */
249 helper->fbdefio.delay = HZ / 20;
250 helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
251
252 fbi->fbdefio = &helper->fbdefio;
253 ret = fb_deferred_io_init(fbi);
254 if (ret)
255 goto fail;
256
257 /* if we have DMM, then we can use it for scrolling by just
258 * shuffling pages around in DMM rather than doing sw blit.
259 */
260 if (fbdev->ywrap_enabled) {
261 DRM_INFO("Enabling DMM ywrap scrolling\n");
262 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
263 fbi->fix.ywrapstep = 1;
264 }
265
266
267 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
268 DBG("allocated %dx%d fb", fb->width, fb->height);
269
270 return 0;
271
272fail:
273
274 if (ret) {
275 if (fb)
276 drm_framebuffer_remove(fb);
277 }
278
279 return ret;
280}
281
282void omap_fbdev_setup(struct drm_device *dev)
283{
284 struct omap_drm_private *priv = dev->dev_private;
285 struct omap_fbdev *fbdev;
286
287 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
288 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
289
290 fbdev = drmm_kzalloc(dev, sizeof(*fbdev), GFP_KERNEL);
291 if (!fbdev)
292 return;
293 fbdev->dev = dev;
294 INIT_WORK(&fbdev->work, pan_worker);
295
296 priv->fbdev = fbdev;
297
298 drm_client_setup(dev, NULL);
299}
1/*
2 * drivers/gpu/drm/omapdrm/omap_fbdev.c
3 *
4 * Copyright (C) 2011 Texas Instruments
5 * Author: Rob Clark <rob@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <drm/drm_crtc.h>
21#include <drm/drm_fb_helper.h>
22
23#include "omap_drv.h"
24
25MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
26static bool ywrap_enabled = true;
27module_param_named(ywrap, ywrap_enabled, bool, 0644);
28
29/*
30 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
31 */
32
33#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
34
35struct omap_fbdev {
36 struct drm_fb_helper base;
37 struct drm_framebuffer *fb;
38 struct drm_gem_object *bo;
39 bool ywrap_enabled;
40
41 /* for deferred dmm roll when getting called in atomic ctx */
42 struct work_struct work;
43};
44
45static struct drm_fb_helper *get_fb(struct fb_info *fbi);
46
47static void pan_worker(struct work_struct *work)
48{
49 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
50 struct fb_info *fbi = fbdev->base.fbdev;
51 int npages;
52
53 /* DMM roll shifts in 4K pages: */
54 npages = fbi->fix.line_length >> PAGE_SHIFT;
55 omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
56}
57
58static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
59 struct fb_info *fbi)
60{
61 struct drm_fb_helper *helper = get_fb(fbi);
62 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
63
64 if (!helper)
65 goto fallback;
66
67 if (!fbdev->ywrap_enabled)
68 goto fallback;
69
70 if (drm_can_sleep()) {
71 pan_worker(&fbdev->work);
72 } else {
73 struct omap_drm_private *priv = helper->dev->dev_private;
74 queue_work(priv->wq, &fbdev->work);
75 }
76
77 return 0;
78
79fallback:
80 return drm_fb_helper_pan_display(var, fbi);
81}
82
83static struct fb_ops omap_fb_ops = {
84 .owner = THIS_MODULE,
85 DRM_FB_HELPER_DEFAULT_OPS,
86
87 /* Note: to properly handle manual update displays, we wrap the
88 * basic fbdev ops which write to the framebuffer
89 */
90 .fb_read = drm_fb_helper_sys_read,
91 .fb_write = drm_fb_helper_sys_write,
92 .fb_fillrect = drm_fb_helper_sys_fillrect,
93 .fb_copyarea = drm_fb_helper_sys_copyarea,
94 .fb_imageblit = drm_fb_helper_sys_imageblit,
95
96 .fb_pan_display = omap_fbdev_pan_display,
97};
98
99static int omap_fbdev_create(struct drm_fb_helper *helper,
100 struct drm_fb_helper_surface_size *sizes)
101{
102 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
103 struct drm_device *dev = helper->dev;
104 struct omap_drm_private *priv = dev->dev_private;
105 struct drm_framebuffer *fb = NULL;
106 union omap_gem_size gsize;
107 struct fb_info *fbi = NULL;
108 struct drm_mode_fb_cmd2 mode_cmd = {0};
109 dma_addr_t paddr;
110 int ret;
111
112 sizes->surface_bpp = 32;
113 sizes->surface_depth = 24;
114
115 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
116 sizes->surface_height, sizes->surface_bpp,
117 sizes->fb_width, sizes->fb_height);
118
119 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
120 sizes->surface_depth);
121
122 mode_cmd.width = sizes->surface_width;
123 mode_cmd.height = sizes->surface_height;
124
125 mode_cmd.pitches[0] =
126 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
127
128 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
129 if (fbdev->ywrap_enabled) {
130 /* need to align pitch to page size if using DMM scrolling */
131 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
132 }
133
134 /* allocate backing bo */
135 gsize = (union omap_gem_size){
136 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
137 };
138 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
139 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
140 if (!fbdev->bo) {
141 dev_err(dev->dev, "failed to allocate buffer object\n");
142 ret = -ENOMEM;
143 goto fail;
144 }
145
146 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
147 if (IS_ERR(fb)) {
148 dev_err(dev->dev, "failed to allocate fb\n");
149 /* note: if fb creation failed, we can't rely on fb destroy
150 * to unref the bo:
151 */
152 drm_gem_object_unreference_unlocked(fbdev->bo);
153 ret = PTR_ERR(fb);
154 goto fail;
155 }
156
157 /* note: this keeps the bo pinned.. which is perhaps not ideal,
158 * but is needed as long as we use fb_mmap() to mmap to userspace
159 * (since this happens using fix.smem_start). Possibly we could
160 * implement our own mmap using GEM mmap support to avoid this
161 * (non-tiled buffer doesn't need to be pinned for fbcon to write
162 * to it). Then we just need to be sure that we are able to re-
163 * pin it in case of an opps.
164 */
165 ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
166 if (ret) {
167 dev_err(dev->dev,
168 "could not map (paddr)! Skipping framebuffer alloc\n");
169 ret = -ENOMEM;
170 goto fail;
171 }
172
173 mutex_lock(&dev->struct_mutex);
174
175 fbi = drm_fb_helper_alloc_fbi(helper);
176 if (IS_ERR(fbi)) {
177 dev_err(dev->dev, "failed to allocate fb info\n");
178 ret = PTR_ERR(fbi);
179 goto fail_unlock;
180 }
181
182 DBG("fbi=%p, dev=%p", fbi, dev);
183
184 fbdev->fb = fb;
185 helper->fb = fb;
186
187 fbi->par = helper;
188 fbi->flags = FBINFO_DEFAULT;
189 fbi->fbops = &omap_fb_ops;
190
191 strcpy(fbi->fix.id, MODULE_NAME);
192
193 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
194 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
195
196 dev->mode_config.fb_base = paddr;
197
198 fbi->screen_base = omap_gem_vaddr(fbdev->bo);
199 fbi->screen_size = fbdev->bo->size;
200 fbi->fix.smem_start = paddr;
201 fbi->fix.smem_len = fbdev->bo->size;
202
203 /* if we have DMM, then we can use it for scrolling by just
204 * shuffling pages around in DMM rather than doing sw blit.
205 */
206 if (fbdev->ywrap_enabled) {
207 DRM_INFO("Enabling DMM ywrap scrolling\n");
208 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
209 fbi->fix.ywrapstep = 1;
210 }
211
212
213 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
214 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
215
216 mutex_unlock(&dev->struct_mutex);
217
218 return 0;
219
220fail_unlock:
221 mutex_unlock(&dev->struct_mutex);
222fail:
223
224 if (ret) {
225
226 drm_fb_helper_release_fbi(helper);
227
228 if (fb) {
229 drm_framebuffer_unregister_private(fb);
230 drm_framebuffer_remove(fb);
231 }
232 }
233
234 return ret;
235}
236
237static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
238 .fb_probe = omap_fbdev_create,
239};
240
241static struct drm_fb_helper *get_fb(struct fb_info *fbi)
242{
243 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
244 /* these are not the fb's you're looking for */
245 return NULL;
246 }
247 return fbi->par;
248}
249
250/* initialize fbdev helper */
251struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
252{
253 struct omap_drm_private *priv = dev->dev_private;
254 struct omap_fbdev *fbdev = NULL;
255 struct drm_fb_helper *helper;
256 int ret = 0;
257
258 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
259 if (!fbdev)
260 goto fail;
261
262 INIT_WORK(&fbdev->work, pan_worker);
263
264 helper = &fbdev->base;
265
266 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
267
268 ret = drm_fb_helper_init(dev, helper,
269 priv->num_crtcs, priv->num_connectors);
270 if (ret) {
271 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
272 goto fail;
273 }
274
275 ret = drm_fb_helper_single_add_all_connectors(helper);
276 if (ret)
277 goto fini;
278
279 ret = drm_fb_helper_initial_config(helper, 32);
280 if (ret)
281 goto fini;
282
283 priv->fbdev = helper;
284
285 return helper;
286
287fini:
288 drm_fb_helper_fini(helper);
289fail:
290 kfree(fbdev);
291
292 dev_warn(dev->dev, "omap_fbdev_init failed\n");
293 /* well, limp along without an fbdev.. maybe X11 will work? */
294
295 return NULL;
296}
297
298void omap_fbdev_free(struct drm_device *dev)
299{
300 struct omap_drm_private *priv = dev->dev_private;
301 struct drm_fb_helper *helper = priv->fbdev;
302 struct omap_fbdev *fbdev;
303
304 DBG();
305
306 drm_fb_helper_unregister_fbi(helper);
307 drm_fb_helper_release_fbi(helper);
308
309 drm_fb_helper_fini(helper);
310
311 fbdev = to_omap_fbdev(priv->fbdev);
312
313 /* release the ref taken in omap_fbdev_create() */
314 omap_gem_put_paddr(fbdev->bo);
315
316 /* this will free the backing object */
317 if (fbdev->fb) {
318 drm_framebuffer_unregister_private(fbdev->fb);
319 drm_framebuffer_remove(fbdev->fb);
320 }
321
322 kfree(fbdev);
323
324 priv->fbdev = NULL;
325}