summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/gma500/accel_2d.c
blob: 45ad5ffedc937748bcbcef4e1fc868d681dbe825 (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
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
// SPDX-License-Identifier: GPL-2.0-only
/**************************************************************************
 * Copyright (c) 2007-2011, Intel Corporation.
 * All Rights Reserved.
 *
 * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
 * develop this driver.
 *
 **************************************************************************/

#include <linux/console.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tty.h>

#include <drm/drm.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>

#include "framebuffer.h"
#include "psb_drv.h"
#include "psb_reg.h"

/**
 *	psb_spank		-	reset the 2D engine
 *	@dev_priv: our PSB DRM device
 *
 *	Soft reset the graphics engine and then reload the necessary registers.
 *	We use this at initialisation time but it will become relevant for
 *	accelerated X later
 */
void psb_spank(struct drm_psb_private *dev_priv)
{
	PSB_WSGX32(_PSB_CS_RESET_BIF_RESET | _PSB_CS_RESET_DPM_RESET |
		_PSB_CS_RESET_TA_RESET | _PSB_CS_RESET_USE_RESET |
		_PSB_CS_RESET_ISP_RESET | _PSB_CS_RESET_TSP_RESET |
		_PSB_CS_RESET_TWOD_RESET, PSB_CR_SOFT_RESET);
	PSB_RSGX32(PSB_CR_SOFT_RESET);

	msleep(1);

	PSB_WSGX32(0, PSB_CR_SOFT_RESET);
	wmb();
	PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) | _PSB_CB_CTRL_CLEAR_FAULT,
		   PSB_CR_BIF_CTRL);
	wmb();
	(void) PSB_RSGX32(PSB_CR_BIF_CTRL);

	msleep(1);
	PSB_WSGX32(PSB_RSGX32(PSB_CR_BIF_CTRL) & ~_PSB_CB_CTRL_CLEAR_FAULT,
		   PSB_CR_BIF_CTRL);
	(void) PSB_RSGX32(PSB_CR_BIF_CTRL);
	PSB_WSGX32(dev_priv->gtt.gatt_start, PSB_CR_BIF_TWOD_REQ_BASE);
}

/**
 *	psb2_2d_wait_available	-	wait for FIFO room
 *	@dev_priv: our DRM device
 *	@size: size (in dwords) of the command we want to issue
 *
 *	Wait until there is room to load the FIFO with our data. If the
 *	device is not responding then reset it
 */
static int psb_2d_wait_available(struct drm_psb_private *dev_priv,
			  unsigned size)
{
	uint32_t avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
	unsigned long t = jiffies + HZ;

	while (avail < size) {
		avail = PSB_RSGX32(PSB_CR_2D_SOCIF);
		if (time_after(jiffies, t)) {
			psb_spank(dev_priv);
			return -EIO;
		}
	}
	return 0;
}

/**
 *	psb_2d_submit		-	submit a 2D command
 *	@dev_priv: our DRM device
 *	@cmdbuf: command to issue
 *	@size: length (in dwords)
 *
 *	Issue one or more 2D commands to the accelerator. This needs to be
 *	serialized later when we add the GEM interfaces for acceleration
 */
static int psbfb_2d_submit(struct drm_psb_private *dev_priv, uint32_t *cmdbuf,
								unsigned size)
{
	int ret = 0;
	int i;
	unsigned submit_size;
	unsigned long flags;

	spin_lock_irqsave(&dev_priv->lock_2d, flags);
	while (size > 0) {
		submit_size = (size < 0x60) ? size : 0x60;
		size -= submit_size;
		ret = psb_2d_wait_available(dev_priv, submit_size);
		if (ret)
			break;

		submit_size <<= 2;

		for (i = 0; i < submit_size; i += 4)
			PSB_WSGX32(*cmdbuf++, PSB_SGX_2D_SLAVE_PORT + i);

		(void)PSB_RSGX32(PSB_SGX_2D_SLAVE_PORT + i - 4);
	}
	spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
	return ret;
}


/**
 *	psb_accel_2d_copy_direction	-	compute blit order
 *	@xdir: X direction of move
 *	@ydir: Y direction of move
 *
 *	Compute the correct order setings to ensure that an overlapping blit
 *	correctly copies all the pixels.
 */
static u32 psb_accel_2d_copy_direction(int xdir, int ydir)
{
	if (xdir < 0)
		return (ydir < 0) ? PSB_2D_COPYORDER_BR2TL :
						PSB_2D_COPYORDER_TR2BL;
	else
		return (ydir < 0) ? PSB_2D_COPYORDER_BL2TR :
						PSB_2D_COPYORDER_TL2BR;
}

/**
 *	psb_accel_2d_copy		-	accelerated 2D copy
 *	@dev_priv: our DRM device
 *	@src_offset in bytes
 *	@src_stride in bytes
 *	@src_format psb 2D format defines
 *	@dst_offset in bytes
 *	@dst_stride in bytes
 *	@dst_format psb 2D format defines
 *	@src_x offset in pixels
 *	@src_y offset in pixels
 *	@dst_x offset in pixels
 *	@dst_y offset in pixels
 *	@size_x of the copied area
 *	@size_y of the copied area
 *
 *	Format and issue a 2D accelerated copy command.
 */
static int psb_accel_2d_copy(struct drm_psb_private *dev_priv,
			     uint32_t src_offset, uint32_t src_stride,
			     uint32_t src_format, uint32_t dst_offset,
			     uint32_t dst_stride, uint32_t dst_format,
			     uint16_t src_x, uint16_t src_y,
			     uint16_t dst_x, uint16_t dst_y,
			     uint16_t size_x, uint16_t size_y)
{
	uint32_t blit_cmd;
	uint32_t buffer[10];
	uint32_t *buf;
	uint32_t direction;

	buf = buffer;

	direction =
	    psb_accel_2d_copy_direction(src_x - dst_x, src_y - dst_y);

	if (direction == PSB_2D_COPYORDER_BR2TL ||
	    direction == PSB_2D_COPYORDER_TR2BL) {
		src_x += size_x - 1;
		dst_x += size_x - 1;
	}
	if (direction == PSB_2D_COPYORDER_BR2TL ||
	    direction == PSB_2D_COPYORDER_BL2TR) {
		src_y += size_y - 1;
		dst_y += size_y - 1;
	}

	blit_cmd =
	    PSB_2D_BLIT_BH |
	    PSB_2D_ROT_NONE |
	    PSB_2D_DSTCK_DISABLE |
	    PSB_2D_SRCCK_DISABLE |
	    PSB_2D_USE_PAT | PSB_2D_ROP3_SRCCOPY | direction;

	*buf++ = PSB_2D_FENCE_BH;
	*buf++ =
	    PSB_2D_DST_SURF_BH | dst_format | (dst_stride <<
					       PSB_2D_DST_STRIDE_SHIFT);
	*buf++ = dst_offset;
	*buf++ =
	    PSB_2D_SRC_SURF_BH | src_format | (src_stride <<
					       PSB_2D_SRC_STRIDE_SHIFT);
	*buf++ = src_offset;
	*buf++ =
	    PSB_2D_SRC_OFF_BH | (src_x << PSB_2D_SRCOFF_XSTART_SHIFT) |
	    (src_y << PSB_2D_SRCOFF_YSTART_SHIFT);
	*buf++ = blit_cmd;
	*buf++ =
	    (dst_x << PSB_2D_DST_XSTART_SHIFT) | (dst_y <<
						  PSB_2D_DST_YSTART_SHIFT);
	*buf++ =
	    (size_x << PSB_2D_DST_XSIZE_SHIFT) | (size_y <<
						  PSB_2D_DST_YSIZE_SHIFT);
	*buf++ = PSB_2D_FLUSH_BH;

	return psbfb_2d_submit(dev_priv, buffer, buf - buffer);
}

/**
 *	psbfb_copyarea_accel	-	copyarea acceleration for /dev/fb
 *	@info: our framebuffer
 *	@a: copyarea parameters from the framebuffer core
 *
 *	Perform a 2D copy via the accelerator
 */
static void psbfb_copyarea_accel(struct fb_info *info,
				 const struct fb_copyarea *a)
{
	struct psb_fbdev *fbdev = info->par;
	struct psb_framebuffer *psbfb = &fbdev->pfb;
	struct drm_device *dev = psbfb->base.dev;
	struct drm_framebuffer *fb = fbdev->psb_fb_helper.fb;
	struct drm_psb_private *dev_priv = dev->dev_private;
	uint32_t offset;
	uint32_t stride;
	uint32_t src_format;
	uint32_t dst_format;

	if (!fb)
		return;

	offset = to_gtt_range(fb->obj[0])->offset;
	stride = fb->pitches[0];

	switch (fb->format->depth) {
	case 8:
		src_format = PSB_2D_SRC_332RGB;
		dst_format = PSB_2D_DST_332RGB;
		break;
	case 15:
		src_format = PSB_2D_SRC_555RGB;
		dst_format = PSB_2D_DST_555RGB;
		break;
	case 16:
		src_format = PSB_2D_SRC_565RGB;
		dst_format = PSB_2D_DST_565RGB;
		break;
	case 24:
	case 32:
		/* this is wrong but since we don't do blending its okay */
		src_format = PSB_2D_SRC_8888ARGB;
		dst_format = PSB_2D_DST_8888ARGB;
		break;
	default:
		/* software fallback */
		drm_fb_helper_cfb_copyarea(info, a);
		return;
	}

	if (!gma_power_begin(dev, false)) {
		drm_fb_helper_cfb_copyarea(info, a);
		return;
	}
	psb_accel_2d_copy(dev_priv,
			  offset, stride, src_format,
			  offset, stride, dst_format,
			  a->sx, a->sy, a->dx, a->dy, a->width, a->height);
	gma_power_end(dev);
}

/**
 *	psbfb_copyarea	-	2D copy interface
 *	@info: our framebuffer
 *	@region: region to copy
 *
 *	Copy an area of the framebuffer console either by the accelerator
 *	or directly using the cfb helpers according to the request
 */
void psbfb_copyarea(struct fb_info *info,
			   const struct fb_copyarea *region)
{
	if (unlikely(info->state != FBINFO_STATE_RUNNING))
		return;

	/* Avoid the 8 pixel erratum */
	if (region->width == 8 || region->height == 8 ||
		(info->flags & FBINFO_HWACCEL_DISABLED))
		return drm_fb_helper_cfb_copyarea(info, region);

	psbfb_copyarea_accel(info, region);
}

/**
 *	psbfb_sync	-	synchronize 2D
 *	@info: our framebuffer
 *
 *	Wait for the 2D engine to quiesce so that we can do CPU
 *	access to the framebuffer again
 */
int psbfb_sync(struct fb_info *info)
{
	struct psb_fbdev *fbdev = info->par;
	struct psb_framebuffer *psbfb = &fbdev->pfb;
	struct drm_device *dev = psbfb->base.dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	unsigned long _end = jiffies + HZ;
	int busy = 0;
	unsigned long flags;

	spin_lock_irqsave(&dev_priv->lock_2d, flags);
	/*
	 * First idle the 2D engine.
	 */

	if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
	    ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
		goto out;

	do {
		busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
		cpu_relax();
	} while (busy && !time_after_eq(jiffies, _end));

	if (busy)
		busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
	if (busy)
		goto out;

	do {
		busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
						_PSB_C2B_STATUS_BUSY) != 0);
		cpu_relax();
	} while (busy && !time_after_eq(jiffies, _end));
	if (busy)
		busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
					_PSB_C2B_STATUS_BUSY) != 0);

out:
	spin_unlock_irqrestore(&dev_priv->lock_2d, flags);
	return (busy) ? -EBUSY : 0;
}