summaryrefslogtreecommitdiffstats
path: root/drivers/video/omap2/vrfb.c
blob: 4e5b960c32c88bbcab1ec7e31c1f1eb7772898d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
/*
 * VRFB Rotation Engine
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/*#define DEBUG*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/mutex.h>

#include <plat/vrfb.h>
#include <plat/sdrc.h>

#ifdef DEBUG
#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
#else
#define DBG(format, ...)
#endif

#define SMS_ROT_VIRT_BASE(context, rot) \
	(((context >= 4) ? 0xD0000000 : 0x70000000) \
	 + (0x4000000 * (context)) \
	 + (0x1000000 * (rot)))

#define OMAP_VRFB_SIZE			(2048 * 2048 * 4)

#define VRFB_PAGE_WIDTH_EXP	5 /* Assuming SDRAM pagesize= 1024 */
#define VRFB_PAGE_HEIGHT_EXP	5 /* 1024 = 2^5 * 2^5 */
#define VRFB_PAGE_WIDTH		(1 << VRFB_PAGE_WIDTH_EXP)
#define VRFB_PAGE_HEIGHT	(1 << VRFB_PAGE_HEIGHT_EXP)
#define SMS_IMAGEHEIGHT_OFFSET	16
#define SMS_IMAGEWIDTH_OFFSET	0
#define SMS_PH_OFFSET		8
#define SMS_PW_OFFSET		4
#define SMS_PS_OFFSET		0

#define VRFB_NUM_CTXS 12
/* bitmap of reserved contexts */
static unsigned long ctx_map;

static DEFINE_MUTEX(ctx_lock);

/*
 * Access to this happens from client drivers or the PM core after wake-up.
 * For the first case we require locking at the driver level, for the second
 * we don't need locking, since no drivers will run until after the wake-up
 * has finished.
 */
static struct {
	u32 physical_ba;
	u32 control;
	u32 size;
} vrfb_hw_context[VRFB_NUM_CTXS];

static inline void restore_hw_context(int ctx)
{
	omap2_sms_write_rot_control(vrfb_hw_context[ctx].control, ctx);
	omap2_sms_write_rot_size(vrfb_hw_context[ctx].size, ctx);
	omap2_sms_write_rot_physical_ba(vrfb_hw_context[ctx].physical_ba, ctx);
}

static u32 get_image_width_roundup(u16 width, u8 bytespp)
{
	unsigned long stride = width * bytespp;
	unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) +
		(stride % VRFB_PAGE_WIDTH != 0);

	return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp;
}

/*
 * This the extra space needed in the VRFB physical area for VRFB to safely wrap
 * any memory accesses to the invisible part of the virtual view to the physical
 * area.
 */
static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp)
{
	return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT *
		bytespp;
}

void omap_vrfb_restore_context(void)
{
	int i;
	unsigned long map = ctx_map;

	for (i = ffs(map); i; i = ffs(map)) {
		/* i=1..32 */
		i--;
		map &= ~(1 << i);
		restore_hw_context(i);
	}
}

void omap_vrfb_adjust_size(u16 *width, u16 *height,
		u8 bytespp)
{
	*width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
	*height = ALIGN(*height, VRFB_PAGE_HEIGHT);
}
EXPORT_SYMBOL(omap_vrfb_adjust_size);

u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp)
{
	unsigned long image_width_roundup = get_image_width_roundup(width,
		bytespp);

	if (image_width_roundup > OMAP_VRFB_LINE_LEN)
		return 0;

	return (width * height * bytespp) + get_extra_physical_size(
		image_width_roundup, bytespp);
}
EXPORT_SYMBOL(omap_vrfb_min_phys_size);

u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp)
{
	unsigned long image_width_roundup = get_image_width_roundup(width,
		bytespp);
	unsigned long height;
	unsigned long extra;

	if (image_width_roundup > OMAP_VRFB_LINE_LEN)
		return 0;

	extra = get_extra_physical_size(image_width_roundup, bytespp);

	if (phys_size < extra)
		return 0;

	height = (phys_size - extra) / (width * bytespp);

	/* Virtual views provided by VRFB are limited to 2048x2048. */
	return min_t(unsigned long, height, 2048);
}
EXPORT_SYMBOL(omap_vrfb_max_height);

void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
		u16 width, u16 height,
		unsigned bytespp, bool yuv_mode)
{
	unsigned pixel_size_exp;
	u16 vrfb_width;
	u16 vrfb_height;
	u8 ctx = vrfb->context;
	u32 size;
	u32 control;

	DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr,
			width, height, bytespp, yuv_mode);

	/* For YUV2 and UYVY modes VRFB needs to handle pixels a bit
	 * differently. See TRM. */
	if (yuv_mode) {
		bytespp *= 2;
		width /= 2;
	}

	if (bytespp == 4)
		pixel_size_exp = 2;
	else if (bytespp == 2)
		pixel_size_exp = 1;
	else
		BUG();

	vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
	vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT);

	DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp);

	size  = vrfb_width << SMS_IMAGEWIDTH_OFFSET;
	size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET;

	control  = pixel_size_exp << SMS_PS_OFFSET;
	control |= VRFB_PAGE_WIDTH_EXP  << SMS_PW_OFFSET;
	control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET;

	vrfb_hw_context[ctx].physical_ba = paddr;
	vrfb_hw_context[ctx].size = size;
	vrfb_hw_context[ctx].control = control;

	omap2_sms_write_rot_physical_ba(paddr, ctx);
	omap2_sms_write_rot_size(size, ctx);
	omap2_sms_write_rot_control(control, ctx);

	DBG("vrfb offset pixels %d, %d\n",
			vrfb_width - width, vrfb_height - height);

	vrfb->xres = width;
	vrfb->yres = height;
	vrfb->xoffset = vrfb_width - width;
	vrfb->yoffset = vrfb_height - height;
	vrfb->bytespp = bytespp;
	vrfb->yuv_mode = yuv_mode;
}
EXPORT_SYMBOL(omap_vrfb_setup);

int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot)
{
	unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp;

	vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size);

	if (!vrfb->vaddr[rot]) {
		printk(KERN_ERR "vrfb: ioremap failed\n");
		return -ENOMEM;
	}

	DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size,
		vrfb->vaddr[rot]);

	return 0;
}
EXPORT_SYMBOL(omap_vrfb_map_angle);

void omap_vrfb_release_ctx(struct vrfb *vrfb)
{
	int rot;
	int ctx = vrfb->context;

	if (ctx == 0xff)
		return;

	DBG("release ctx %d\n", ctx);

	mutex_lock(&ctx_lock);

	BUG_ON(!(ctx_map & (1 << ctx)));

	clear_bit(ctx, &ctx_map);

	for (rot = 0; rot < 4; ++rot) {
		if (vrfb->paddr[rot]) {
			release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE);
			vrfb->paddr[rot] = 0;
		}
	}

	vrfb->context = 0xff;

	mutex_unlock(&ctx_lock);
}
EXPORT_SYMBOL(omap_vrfb_release_ctx);

int omap_vrfb_request_ctx(struct vrfb *vrfb)
{
	int rot;
	u32 paddr;
	u8 ctx;
	int r;

	DBG("request ctx\n");

	mutex_lock(&ctx_lock);

	for (ctx = 0; ctx < VRFB_NUM_CTXS; ++ctx)
		if ((ctx_map & (1 << ctx)) == 0)
			break;

	if (ctx == VRFB_NUM_CTXS) {
		pr_err("vrfb: no free contexts\n");
		r = -EBUSY;
		goto out;
	}

	DBG("found free ctx %d\n", ctx);

	set_bit(ctx, &ctx_map);

	memset(vrfb, 0, sizeof(*vrfb));

	vrfb->context = ctx;

	for (rot = 0; rot < 4; ++rot) {
		paddr = SMS_ROT_VIRT_BASE(ctx, rot);
		if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) {
			pr_err("vrfb: failed to reserve VRFB "
					"area for ctx %d, rotation %d\n",
					ctx, rot * 90);
			omap_vrfb_release_ctx(vrfb);
			r = -ENOMEM;
			goto out;
		}

		vrfb->paddr[rot] = paddr;

		DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]);
	}

	r = 0;
out:
	mutex_unlock(&ctx_lock);
	return r;
}
EXPORT_SYMBOL(omap_vrfb_request_ctx);