1/*
2 * drivers/gpu/drm/omapdrm/omap_fb.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 "omap_drv.h"
21#include "omap_dmm_tiler.h"
22
23#include "drm_crtc.h"
24#include "drm_crtc_helper.h"
25
26/*
27 * framebuffer funcs
28 */
29
30/* per-format info: */
31struct format {
32	enum omap_color_mode dss_format;
33	uint32_t pixel_format;
34	struct {
35		int stride_bpp;           /* this times width is stride */
36		int sub_y;                /* sub-sample in y dimension */
37	} planes[4];
38	bool yuv;
39};
40
41static const struct format formats[] = {
42	/* 16bpp [A]RGB: */
43	{ OMAP_DSS_COLOR_RGB16,       DRM_FORMAT_RGB565,   {{2, 1}}, false }, /* RGB16-565 */
44	{ OMAP_DSS_COLOR_RGB12U,      DRM_FORMAT_RGBX4444, {{2, 1}}, false }, /* RGB12x-4444 */
45	{ OMAP_DSS_COLOR_RGBX16,      DRM_FORMAT_XRGB4444, {{2, 1}}, false }, /* xRGB12-4444 */
46	{ OMAP_DSS_COLOR_RGBA16,      DRM_FORMAT_RGBA4444, {{2, 1}}, false }, /* RGBA12-4444 */
47	{ OMAP_DSS_COLOR_ARGB16,      DRM_FORMAT_ARGB4444, {{2, 1}}, false }, /* ARGB16-4444 */
48	{ OMAP_DSS_COLOR_XRGB16_1555, DRM_FORMAT_XRGB1555, {{2, 1}}, false }, /* xRGB15-1555 */
49	{ OMAP_DSS_COLOR_ARGB16_1555, DRM_FORMAT_ARGB1555, {{2, 1}}, false }, /* ARGB16-1555 */
50	/* 24bpp RGB: */
51	{ OMAP_DSS_COLOR_RGB24P,      DRM_FORMAT_RGB888,   {{3, 1}}, false }, /* RGB24-888 */
52	/* 32bpp [A]RGB: */
53	{ OMAP_DSS_COLOR_RGBX32,      DRM_FORMAT_RGBX8888, {{4, 1}}, false }, /* RGBx24-8888 */
54	{ OMAP_DSS_COLOR_RGB24U,      DRM_FORMAT_XRGB8888, {{4, 1}}, false }, /* xRGB24-8888 */
55	{ OMAP_DSS_COLOR_RGBA32,      DRM_FORMAT_RGBA8888, {{4, 1}}, false }, /* RGBA32-8888 */
56	{ OMAP_DSS_COLOR_ARGB32,      DRM_FORMAT_ARGB8888, {{4, 1}}, false }, /* ARGB32-8888 */
57	/* YUV: */
58	{ OMAP_DSS_COLOR_NV12,        DRM_FORMAT_NV12,     {{1, 1}, {1, 2}}, true },
59	{ OMAP_DSS_COLOR_YUV2,        DRM_FORMAT_YUYV,     {{2, 1}}, true },
60	{ OMAP_DSS_COLOR_UYVY,        DRM_FORMAT_UYVY,     {{2, 1}}, true },
61};
62
63/* convert from overlay's pixel formats bitmask to an array of fourcc's */
64uint32_t omap_framebuffer_get_formats(uint32_t *pixel_formats,
65		uint32_t max_formats, enum omap_color_mode supported_modes)
66{
67	uint32_t nformats = 0;
68	int i = 0;
69
70	for (i = 0; i < ARRAY_SIZE(formats) && nformats < max_formats; i++)
71		if (formats[i].dss_format & supported_modes)
72			pixel_formats[nformats++] = formats[i].pixel_format;
73
74	return nformats;
75}
76
77/* per-plane info for the fb: */
78struct plane {
79	struct drm_gem_object *bo;
80	uint32_t pitch;
81	uint32_t offset;
82	dma_addr_t paddr;
83};
84
85#define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
86
87struct omap_framebuffer {
88	struct drm_framebuffer base;
89	int pin_count;
90	const struct format *format;
91	struct plane planes[4];
92};
93
94static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
95		struct drm_file *file_priv,
96		unsigned int *handle)
97{
98	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
99	return drm_gem_handle_create(file_priv,
100			omap_fb->planes[0].bo, handle);
101}
102
103static void omap_framebuffer_destroy(struct drm_framebuffer *fb)
104{
105	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
106	int i, n = drm_format_num_planes(fb->pixel_format);
107
108	DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
109
110	drm_framebuffer_cleanup(fb);
111
112	for (i = 0; i < n; i++) {
113		struct plane *plane = &omap_fb->planes[i];
114		if (plane->bo)
115			drm_gem_object_unreference_unlocked(plane->bo);
116	}
117
118	kfree(omap_fb);
119}
120
121static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
122		struct drm_file *file_priv, unsigned flags, unsigned color,
123		struct drm_clip_rect *clips, unsigned num_clips)
124{
125	return 0;
126}
127
128static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
129	.create_handle = omap_framebuffer_create_handle,
130	.destroy = omap_framebuffer_destroy,
131	.dirty = omap_framebuffer_dirty,
132};
133
134static uint32_t get_linear_addr(struct plane *plane,
135		const struct format *format, int n, int x, int y)
136{
137	uint32_t offset;
138
139	offset = plane->offset +
140			(x * format->planes[n].stride_bpp) +
141			(y * plane->pitch / format->planes[n].sub_y);
142
143	return plane->paddr + offset;
144}
145
146/* update ovl info for scanout, handles cases of multi-planar fb's, etc.
147 */
148void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
149		struct omap_drm_window *win, struct omap_overlay_info *info)
150{
151	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
152	const struct format *format = omap_fb->format;
153	struct plane *plane = &omap_fb->planes[0];
154	uint32_t x, y, orient = 0;
155
156	info->color_mode = format->dss_format;
157
158	info->pos_x      = win->crtc_x;
159	info->pos_y      = win->crtc_y;
160	info->out_width  = win->crtc_w;
161	info->out_height = win->crtc_h;
162	info->width      = win->src_w;
163	info->height     = win->src_h;
164
165	x = win->src_x;
166	y = win->src_y;
167
168	if (omap_gem_flags(plane->bo) & OMAP_BO_TILED) {
169		uint32_t w = win->src_w;
170		uint32_t h = win->src_h;
171
172		switch (win->rotation & 0xf) {
173		default:
174			dev_err(fb->dev->dev, "invalid rotation: %02x",
175					(uint32_t)win->rotation);
176			/* fallthru to default to no rotation */
177		case 0:
178		case BIT(DRM_ROTATE_0):
179			orient = 0;
180			break;
181		case BIT(DRM_ROTATE_90):
182			orient = MASK_XY_FLIP | MASK_X_INVERT;
183			break;
184		case BIT(DRM_ROTATE_180):
185			orient = MASK_X_INVERT | MASK_Y_INVERT;
186			break;
187		case BIT(DRM_ROTATE_270):
188			orient = MASK_XY_FLIP | MASK_Y_INVERT;
189			break;
190		}
191
192		if (win->rotation & BIT(DRM_REFLECT_X))
193			orient ^= MASK_X_INVERT;
194
195		if (win->rotation & BIT(DRM_REFLECT_Y))
196			orient ^= MASK_Y_INVERT;
197
198		/* adjust x,y offset for flip/invert: */
199		if (orient & MASK_XY_FLIP)
200			swap(w, h);
201		if (orient & MASK_Y_INVERT)
202			y += h - 1;
203		if (orient & MASK_X_INVERT)
204			x += w - 1;
205
206		omap_gem_rotated_paddr(plane->bo, orient, x, y, &info->paddr);
207		info->rotation_type = OMAP_DSS_ROT_TILER;
208		info->screen_width  = omap_gem_tiled_stride(plane->bo, orient);
209	} else {
210		switch (win->rotation & 0xf) {
211		case 0:
212		case BIT(DRM_ROTATE_0):
213			/* OK */
214			break;
215
216		default:
217			dev_warn(fb->dev->dev,
218				"rotation '%d' ignored for non-tiled fb\n",
219				win->rotation);
220			win->rotation = 0;
221			break;
222		}
223
224		info->paddr         = get_linear_addr(plane, format, 0, x, y);
225		info->rotation_type = OMAP_DSS_ROT_DMA;
226		info->screen_width  = plane->pitch;
227	}
228
229	/* convert to pixels: */
230	info->screen_width /= format->planes[0].stride_bpp;
231
232	if (format->dss_format == OMAP_DSS_COLOR_NV12) {
233		plane = &omap_fb->planes[1];
234
235		if (info->rotation_type == OMAP_DSS_ROT_TILER) {
236			WARN_ON(!(omap_gem_flags(plane->bo) & OMAP_BO_TILED));
237			omap_gem_rotated_paddr(plane->bo, orient,
238					x/2, y/2, &info->p_uv_addr);
239		} else {
240			info->p_uv_addr = get_linear_addr(plane, format, 1, x, y);
241		}
242	} else {
243		info->p_uv_addr = 0;
244	}
245}
246
247/* pin, prepare for scanout: */
248int omap_framebuffer_pin(struct drm_framebuffer *fb)
249{
250	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
251	int ret, i, n = drm_format_num_planes(fb->pixel_format);
252
253	if (omap_fb->pin_count > 0) {
254		omap_fb->pin_count++;
255		return 0;
256	}
257
258	for (i = 0; i < n; i++) {
259		struct plane *plane = &omap_fb->planes[i];
260		ret = omap_gem_get_paddr(plane->bo, &plane->paddr, true);
261		if (ret)
262			goto fail;
263		omap_gem_dma_sync(plane->bo, DMA_TO_DEVICE);
264	}
265
266	omap_fb->pin_count++;
267
268	return 0;
269
270fail:
271	for (i--; i >= 0; i--) {
272		struct plane *plane = &omap_fb->planes[i];
273		omap_gem_put_paddr(plane->bo);
274		plane->paddr = 0;
275	}
276
277	return ret;
278}
279
280/* unpin, no longer being scanned out: */
281int omap_framebuffer_unpin(struct drm_framebuffer *fb)
282{
283	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
284	int ret, i, n = drm_format_num_planes(fb->pixel_format);
285
286	omap_fb->pin_count--;
287
288	if (omap_fb->pin_count > 0)
289		return 0;
290
291	for (i = 0; i < n; i++) {
292		struct plane *plane = &omap_fb->planes[i];
293		ret = omap_gem_put_paddr(plane->bo);
294		if (ret)
295			goto fail;
296		plane->paddr = 0;
297	}
298
299	return 0;
300
301fail:
302	return ret;
303}
304
305struct drm_gem_object *omap_framebuffer_bo(struct drm_framebuffer *fb, int p)
306{
307	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
308	if (p >= drm_format_num_planes(fb->pixel_format))
309		return NULL;
310	return omap_fb->planes[p].bo;
311}
312
313/* iterate thru all the connectors, returning ones that are attached
314 * to the same fb..
315 */
316struct drm_connector *omap_framebuffer_get_next_connector(
317		struct drm_framebuffer *fb, struct drm_connector *from)
318{
319	struct drm_device *dev = fb->dev;
320	struct list_head *connector_list = &dev->mode_config.connector_list;
321	struct drm_connector *connector = from;
322
323	if (!from)
324		return list_first_entry_or_null(connector_list, typeof(*from),
325						head);
326
327	list_for_each_entry_from(connector, connector_list, head) {
328		if (connector != from) {
329			struct drm_encoder *encoder = connector->encoder;
330			struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
331			if (crtc && crtc->primary->fb == fb)
332				return connector;
333
334		}
335	}
336
337	return NULL;
338}
339
340#ifdef CONFIG_DEBUG_FS
341void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
342{
343	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
344	int i, n = drm_format_num_planes(fb->pixel_format);
345
346	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
347			(char *)&fb->pixel_format);
348
349	for (i = 0; i < n; i++) {
350		struct plane *plane = &omap_fb->planes[i];
351		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
352				i, plane->offset, plane->pitch);
353		omap_gem_describe(plane->bo, m);
354	}
355}
356#endif
357
358struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
359		struct drm_file *file, struct drm_mode_fb_cmd2 *mode_cmd)
360{
361	struct drm_gem_object *bos[4];
362	struct drm_framebuffer *fb;
363	int ret;
364
365	ret = objects_lookup(dev, file, mode_cmd->pixel_format,
366			bos, mode_cmd->handles);
367	if (ret)
368		return ERR_PTR(ret);
369
370	fb = omap_framebuffer_init(dev, mode_cmd, bos);
371	if (IS_ERR(fb)) {
372		int i, n = drm_format_num_planes(mode_cmd->pixel_format);
373		for (i = 0; i < n; i++)
374			drm_gem_object_unreference_unlocked(bos[i]);
375		return fb;
376	}
377	return fb;
378}
379
380struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
381		struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
382{
383	struct omap_framebuffer *omap_fb = NULL;
384	struct drm_framebuffer *fb = NULL;
385	const struct format *format = NULL;
386	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
387
388	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
389			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
390			(char *)&mode_cmd->pixel_format);
391
392	for (i = 0; i < ARRAY_SIZE(formats); i++) {
393		if (formats[i].pixel_format == mode_cmd->pixel_format) {
394			format = &formats[i];
395			break;
396		}
397	}
398
399	if (!format) {
400		dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
401				(char *)&mode_cmd->pixel_format);
402		ret = -EINVAL;
403		goto fail;
404	}
405
406	omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
407	if (!omap_fb) {
408		ret = -ENOMEM;
409		goto fail;
410	}
411
412	fb = &omap_fb->base;
413	omap_fb->format = format;
414
415	for (i = 0; i < n; i++) {
416		struct plane *plane = &omap_fb->planes[i];
417		int size, pitch = mode_cmd->pitches[i];
418
419		if (pitch < (mode_cmd->width * format->planes[i].stride_bpp)) {
420			dev_err(dev->dev, "provided buffer pitch is too small! %d < %d\n",
421					pitch, mode_cmd->width * format->planes[i].stride_bpp);
422			ret = -EINVAL;
423			goto fail;
424		}
425
426		if (pitch % format->planes[i].stride_bpp != 0) {
427			dev_err(dev->dev,
428				"buffer pitch (%d bytes) is not a multiple of pixel size (%d bytes)\n",
429				pitch, format->planes[i].stride_bpp);
430			ret = -EINVAL;
431			goto fail;
432		}
433
434		size = pitch * mode_cmd->height / format->planes[i].sub_y;
435
436		if (size > (omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i])) {
437			dev_err(dev->dev, "provided buffer object is too small! %d < %d\n",
438					bos[i]->size - mode_cmd->offsets[i], size);
439			ret = -EINVAL;
440			goto fail;
441		}
442
443		plane->bo     = bos[i];
444		plane->offset = mode_cmd->offsets[i];
445		plane->pitch  = pitch;
446		plane->paddr  = 0;
447	}
448
449	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
450
451	ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
452	if (ret) {
453		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
454		goto fail;
455	}
456
457	DBG("create: FB ID: %d (%p)", fb->base.id, fb);
458
459	return fb;
460
461fail:
462	kfree(omap_fb);
463
464	return ERR_PTR(ret);
465}
466