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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
86 /* Note: to properly handle manual update displays, we wrap the
87 * basic fbdev ops which write to the framebuffer
88 */
89 .fb_read = drm_fb_helper_sys_read,
90 .fb_write = drm_fb_helper_sys_write,
91 .fb_fillrect = drm_fb_helper_sys_fillrect,
92 .fb_copyarea = drm_fb_helper_sys_copyarea,
93 .fb_imageblit = drm_fb_helper_sys_imageblit,
94
95 .fb_check_var = drm_fb_helper_check_var,
96 .fb_set_par = drm_fb_helper_set_par,
97 .fb_pan_display = omap_fbdev_pan_display,
98 .fb_blank = drm_fb_helper_blank,
99 .fb_setcmap = drm_fb_helper_setcmap,
100};
101
102static int omap_fbdev_create(struct drm_fb_helper *helper,
103 struct drm_fb_helper_surface_size *sizes)
104{
105 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
106 struct drm_device *dev = helper->dev;
107 struct omap_drm_private *priv = dev->dev_private;
108 struct drm_framebuffer *fb = NULL;
109 union omap_gem_size gsize;
110 struct fb_info *fbi = NULL;
111 struct drm_mode_fb_cmd2 mode_cmd = {0};
112 dma_addr_t paddr;
113 int ret;
114
115 sizes->surface_bpp = 32;
116 sizes->surface_depth = 24;
117
118 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
119 sizes->surface_height, sizes->surface_bpp,
120 sizes->fb_width, sizes->fb_height);
121
122 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
123 sizes->surface_depth);
124
125 mode_cmd.width = sizes->surface_width;
126 mode_cmd.height = sizes->surface_height;
127
128 mode_cmd.pitches[0] = align_pitch(
129 mode_cmd.width * ((sizes->surface_bpp + 7) / 8),
130 mode_cmd.width, sizes->surface_bpp);
131
132 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
133 if (fbdev->ywrap_enabled) {
134 /* need to align pitch to page size if using DMM scrolling */
135 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
136 }
137
138 /* allocate backing bo */
139 gsize = (union omap_gem_size){
140 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
141 };
142 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
143 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
144 if (!fbdev->bo) {
145 dev_err(dev->dev, "failed to allocate buffer object\n");
146 ret = -ENOMEM;
147 goto fail;
148 }
149
150 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
151 if (IS_ERR(fb)) {
152 dev_err(dev->dev, "failed to allocate fb\n");
153 /* note: if fb creation failed, we can't rely on fb destroy
154 * to unref the bo:
155 */
156 drm_gem_object_unreference(fbdev->bo);
157 ret = PTR_ERR(fb);
158 goto fail;
159 }
160
161 /* note: this keeps the bo pinned.. which is perhaps not ideal,
162 * but is needed as long as we use fb_mmap() to mmap to userspace
163 * (since this happens using fix.smem_start). Possibly we could
164 * implement our own mmap using GEM mmap support to avoid this
165 * (non-tiled buffer doesn't need to be pinned for fbcon to write
166 * to it). Then we just need to be sure that we are able to re-
167 * pin it in case of an opps.
168 */
169 ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
170 if (ret) {
171 dev_err(dev->dev,
172 "could not map (paddr)! Skipping framebuffer alloc\n");
173 ret = -ENOMEM;
174 goto fail;
175 }
176
177 mutex_lock(&dev->struct_mutex);
178
179 fbi = drm_fb_helper_alloc_fbi(helper);
180 if (IS_ERR(fbi)) {
181 dev_err(dev->dev, "failed to allocate fb info\n");
182 ret = PTR_ERR(fbi);
183 goto fail_unlock;
184 }
185
186 DBG("fbi=%p, dev=%p", fbi, dev);
187
188 fbdev->fb = fb;
189 helper->fb = fb;
190
191 fbi->par = helper;
192 fbi->flags = FBINFO_DEFAULT;
193 fbi->fbops = &omap_fb_ops;
194
195 strcpy(fbi->fix.id, MODULE_NAME);
196
197 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
198 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
199
200 dev->mode_config.fb_base = paddr;
201
202 fbi->screen_base = omap_gem_vaddr(fbdev->bo);
203 fbi->screen_size = fbdev->bo->size;
204 fbi->fix.smem_start = paddr;
205 fbi->fix.smem_len = fbdev->bo->size;
206
207 /* if we have DMM, then we can use it for scrolling by just
208 * shuffling pages around in DMM rather than doing sw blit.
209 */
210 if (fbdev->ywrap_enabled) {
211 DRM_INFO("Enabling DMM ywrap scrolling\n");
212 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
213 fbi->fix.ywrapstep = 1;
214 }
215
216
217 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
218 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
219
220 mutex_unlock(&dev->struct_mutex);
221
222 return 0;
223
224fail_unlock:
225 mutex_unlock(&dev->struct_mutex);
226fail:
227
228 if (ret) {
229
230 drm_fb_helper_release_fbi(helper);
231
232 if (fb) {
233 drm_framebuffer_unregister_private(fb);
234 drm_framebuffer_remove(fb);
235 }
236 }
237
238 return ret;
239}
240
241static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
242 .fb_probe = omap_fbdev_create,
243};
244
245static struct drm_fb_helper *get_fb(struct fb_info *fbi)
246{
247 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
248 /* these are not the fb's you're looking for */
249 return NULL;
250 }
251 return fbi->par;
252}
253
254/* initialize fbdev helper */
255struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
256{
257 struct omap_drm_private *priv = dev->dev_private;
258 struct omap_fbdev *fbdev = NULL;
259 struct drm_fb_helper *helper;
260 int ret = 0;
261
262 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
263 if (!fbdev)
264 goto fail;
265
266 INIT_WORK(&fbdev->work, pan_worker);
267
268 helper = &fbdev->base;
269
270 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
271
272 ret = drm_fb_helper_init(dev, helper,
273 priv->num_crtcs, priv->num_connectors);
274 if (ret) {
275 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
276 goto fail;
277 }
278
279 ret = drm_fb_helper_single_add_all_connectors(helper);
280 if (ret)
281 goto fini;
282
283 /* disable all the possible outputs/crtcs before entering KMS mode */
284 drm_helper_disable_unused_functions(dev);
285
286 ret = drm_fb_helper_initial_config(helper, 32);
287 if (ret)
288 goto fini;
289
290 priv->fbdev = helper;
291
292 return helper;
293
294fini:
295 drm_fb_helper_fini(helper);
296fail:
297 kfree(fbdev);
298
299 dev_warn(dev->dev, "omap_fbdev_init failed\n");
300 /* well, limp along without an fbdev.. maybe X11 will work? */
301
302 return NULL;
303}
304
305void omap_fbdev_free(struct drm_device *dev)
306{
307 struct omap_drm_private *priv = dev->dev_private;
308 struct drm_fb_helper *helper = priv->fbdev;
309 struct omap_fbdev *fbdev;
310
311 DBG();
312
313 drm_fb_helper_unregister_fbi(helper);
314 drm_fb_helper_release_fbi(helper);
315
316 drm_fb_helper_fini(helper);
317
318 fbdev = to_omap_fbdev(priv->fbdev);
319
320 /* release the ref taken in omap_fbdev_create() */
321 omap_gem_put_paddr(fbdev->bo);
322
323 /* this will free the backing object */
324 if (fbdev->fb) {
325 drm_framebuffer_unregister_private(fbdev->fb);
326 drm_framebuffer_remove(fbdev->fb);
327 }
328
329 kfree(fbdev);
330
331 priv->fbdev = NULL;
332}
1/*
2 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
3 * Author: Rob Clark <rob@ti.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 <drm/drm_crtc.h>
19#include <drm/drm_fb_helper.h>
20
21#include "omap_drv.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
31#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
32
33struct omap_fbdev {
34 struct drm_fb_helper base;
35 struct drm_framebuffer *fb;
36 struct drm_gem_object *bo;
37 bool ywrap_enabled;
38
39 /* for deferred dmm roll when getting called in atomic ctx */
40 struct work_struct work;
41};
42
43static struct drm_fb_helper *get_fb(struct fb_info *fbi);
44
45static void pan_worker(struct work_struct *work)
46{
47 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
48 struct fb_info *fbi = fbdev->base.fbdev;
49 int npages;
50
51 /* DMM roll shifts in 4K pages: */
52 npages = fbi->fix.line_length >> PAGE_SHIFT;
53 omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
54}
55
56static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
57 struct fb_info *fbi)
58{
59 struct drm_fb_helper *helper = get_fb(fbi);
60 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
61
62 if (!helper)
63 goto fallback;
64
65 if (!fbdev->ywrap_enabled)
66 goto fallback;
67
68 if (drm_can_sleep()) {
69 pan_worker(&fbdev->work);
70 } else {
71 struct omap_drm_private *priv = helper->dev->dev_private;
72 queue_work(priv->wq, &fbdev->work);
73 }
74
75 return 0;
76
77fallback:
78 return drm_fb_helper_pan_display(var, fbi);
79}
80
81static struct fb_ops omap_fb_ops = {
82 .owner = THIS_MODULE,
83
84 .fb_check_var = drm_fb_helper_check_var,
85 .fb_set_par = drm_fb_helper_set_par,
86 .fb_setcmap = drm_fb_helper_setcmap,
87 .fb_blank = drm_fb_helper_blank,
88 .fb_pan_display = omap_fbdev_pan_display,
89 .fb_debug_enter = drm_fb_helper_debug_enter,
90 .fb_debug_leave = drm_fb_helper_debug_leave,
91 .fb_ioctl = drm_fb_helper_ioctl,
92
93 .fb_read = drm_fb_helper_sys_read,
94 .fb_write = drm_fb_helper_sys_write,
95 .fb_fillrect = drm_fb_helper_sys_fillrect,
96 .fb_copyarea = drm_fb_helper_sys_copyarea,
97 .fb_imageblit = drm_fb_helper_sys_imageblit,
98};
99
100static int omap_fbdev_create(struct drm_fb_helper *helper,
101 struct drm_fb_helper_surface_size *sizes)
102{
103 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
104 struct drm_device *dev = helper->dev;
105 struct omap_drm_private *priv = dev->dev_private;
106 struct drm_framebuffer *fb = NULL;
107 union omap_gem_size gsize;
108 struct fb_info *fbi = NULL;
109 struct drm_mode_fb_cmd2 mode_cmd = {0};
110 dma_addr_t dma_addr;
111 int ret;
112
113 sizes->surface_bpp = 32;
114 sizes->surface_depth = 24;
115
116 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
117 sizes->surface_height, sizes->surface_bpp,
118 sizes->fb_width, sizes->fb_height);
119
120 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
121 sizes->surface_depth);
122
123 mode_cmd.width = sizes->surface_width;
124 mode_cmd.height = sizes->surface_height;
125
126 mode_cmd.pitches[0] =
127 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
128
129 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
130 if (fbdev->ywrap_enabled) {
131 /* need to align pitch to page size if using DMM scrolling */
132 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
133 }
134
135 /* allocate backing bo */
136 gsize = (union omap_gem_size){
137 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
138 };
139 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
140 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
141 if (!fbdev->bo) {
142 dev_err(dev->dev, "failed to allocate buffer object\n");
143 ret = -ENOMEM;
144 goto fail;
145 }
146
147 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
148 if (IS_ERR(fb)) {
149 dev_err(dev->dev, "failed to allocate fb\n");
150 /* note: if fb creation failed, we can't rely on fb destroy
151 * to unref the bo:
152 */
153 drm_gem_object_unreference_unlocked(fbdev->bo);
154 ret = PTR_ERR(fb);
155 goto fail;
156 }
157
158 /* note: this keeps the bo pinned.. which is perhaps not ideal,
159 * but is needed as long as we use fb_mmap() to mmap to userspace
160 * (since this happens using fix.smem_start). Possibly we could
161 * implement our own mmap using GEM mmap support to avoid this
162 * (non-tiled buffer doesn't need to be pinned for fbcon to write
163 * to it). Then we just need to be sure that we are able to re-
164 * pin it in case of an opps.
165 */
166 ret = omap_gem_pin(fbdev->bo, &dma_addr);
167 if (ret) {
168 dev_err(dev->dev, "could not pin framebuffer\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->fbops = &omap_fb_ops;
189
190 strcpy(fbi->fix.id, MODULE_NAME);
191
192 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
193 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
194
195 dev->mode_config.fb_base = dma_addr;
196
197 fbi->screen_buffer = omap_gem_vaddr(fbdev->bo);
198 fbi->screen_size = fbdev->bo->size;
199 fbi->fix.smem_start = dma_addr;
200 fbi->fix.smem_len = fbdev->bo->size;
201
202 /* if we have DMM, then we can use it for scrolling by just
203 * shuffling pages around in DMM rather than doing sw blit.
204 */
205 if (fbdev->ywrap_enabled) {
206 DRM_INFO("Enabling DMM ywrap scrolling\n");
207 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
208 fbi->fix.ywrapstep = 1;
209 }
210
211
212 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
213 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
214
215 mutex_unlock(&dev->struct_mutex);
216
217 return 0;
218
219fail_unlock:
220 mutex_unlock(&dev->struct_mutex);
221fail:
222
223 if (ret) {
224 if (fb)
225 drm_framebuffer_remove(fb);
226 }
227
228 return ret;
229}
230
231static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
232 .fb_probe = omap_fbdev_create,
233};
234
235static struct drm_fb_helper *get_fb(struct fb_info *fbi)
236{
237 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
238 /* these are not the fb's you're looking for */
239 return NULL;
240 }
241 return fbi->par;
242}
243
244/* initialize fbdev helper */
245void omap_fbdev_init(struct drm_device *dev)
246{
247 struct omap_drm_private *priv = dev->dev_private;
248 struct omap_fbdev *fbdev = NULL;
249 struct drm_fb_helper *helper;
250 int ret = 0;
251
252 if (!priv->num_crtcs || !priv->num_connectors)
253 return;
254
255 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
256 if (!fbdev)
257 goto fail;
258
259 INIT_WORK(&fbdev->work, pan_worker);
260
261 helper = &fbdev->base;
262
263 drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
264
265 ret = drm_fb_helper_init(dev, helper, priv->num_connectors);
266 if (ret)
267 goto fail;
268
269 ret = drm_fb_helper_single_add_all_connectors(helper);
270 if (ret)
271 goto fini;
272
273 ret = drm_fb_helper_initial_config(helper, 32);
274 if (ret)
275 goto fini;
276
277 priv->fbdev = helper;
278
279 return;
280
281fini:
282 drm_fb_helper_fini(helper);
283fail:
284 kfree(fbdev);
285
286 dev_warn(dev->dev, "omap_fbdev_init failed\n");
287}
288
289void omap_fbdev_fini(struct drm_device *dev)
290{
291 struct omap_drm_private *priv = dev->dev_private;
292 struct drm_fb_helper *helper = priv->fbdev;
293 struct omap_fbdev *fbdev;
294
295 DBG();
296
297 if (!helper)
298 return;
299
300 drm_fb_helper_unregister_fbi(helper);
301
302 drm_fb_helper_fini(helper);
303
304 fbdev = to_omap_fbdev(helper);
305
306 /* unpin the GEM object pinned in omap_fbdev_create() */
307 if (fbdev->bo)
308 omap_gem_unpin(fbdev->bo);
309
310 /* this will free the backing object */
311 if (fbdev->fb)
312 drm_framebuffer_remove(fbdev->fb);
313
314 kfree(fbdev);
315
316 priv->fbdev = NULL;
317}