summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/ipu-v3/ipu-prg.c
blob: 97b99500153d3e1477e40e3c0c4d5958c37a9c71 (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
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
/*
 * Copyright (c) 2016-2017 Lucas Stach, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 */

#include <drm/drm_fourcc.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/iopoll.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <video/imx-ipu-v3.h>

#include "ipu-prv.h"

#define IPU_PRG_CTL				0x00
#define  IPU_PRG_CTL_BYPASS(i)			(1 << (0 + i))
#define  IPU_PRG_CTL_SOFT_ARID_MASK		0x3
#define  IPU_PRG_CTL_SOFT_ARID_SHIFT(i)		(8 + i * 2)
#define  IPU_PRG_CTL_SOFT_ARID(i, v)		((v & 0x3) << (8 + 2 * i))
#define  IPU_PRG_CTL_SO(i)			(1 << (16 + i))
#define  IPU_PRG_CTL_VFLIP(i)			(1 << (19 + i))
#define  IPU_PRG_CTL_BLOCK_MODE(i)		(1 << (22 + i))
#define  IPU_PRG_CTL_CNT_LOAD_EN(i)		(1 << (25 + i))
#define  IPU_PRG_CTL_SOFTRST			(1 << 30)
#define  IPU_PRG_CTL_SHADOW_EN			(1 << 31)

#define IPU_PRG_STATUS				0x04
#define  IPU_PRG_STATUS_BUFFER0_READY(i)	(1 << (0 + i * 2))
#define  IPU_PRG_STATUS_BUFFER1_READY(i)	(1 << (1 + i * 2))

#define IPU_PRG_QOS				0x08
#define  IPU_PRG_QOS_ARID_MASK			0xf
#define  IPU_PRG_QOS_ARID_SHIFT(i)		(0 + i * 4)

#define IPU_PRG_REG_UPDATE			0x0c
#define  IPU_PRG_REG_UPDATE_REG_UPDATE		(1 << 0)

#define IPU_PRG_STRIDE(i)			(0x10 + i * 0x4)
#define  IPU_PRG_STRIDE_STRIDE_MASK		0x3fff

#define IPU_PRG_CROP_LINE			0x1c

#define IPU_PRG_THD				0x20

#define IPU_PRG_BADDR(i)			(0x24 + i * 0x4)

#define IPU_PRG_OFFSET(i)			(0x30 + i * 0x4)

#define IPU_PRG_ILO(i)				(0x3c + i * 0x4)

#define IPU_PRG_HEIGHT(i)			(0x48 + i * 0x4)
#define  IPU_PRG_HEIGHT_PRE_HEIGHT_MASK		0xfff
#define  IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT	0
#define  IPU_PRG_HEIGHT_IPU_HEIGHT_MASK		0xfff
#define  IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT	16

struct ipu_prg_channel {
	bool			enabled;
	int			used_pre;
};

struct ipu_prg {
	struct list_head	list;
	struct device		*dev;
	int			id;

	void __iomem		*regs;
	struct clk		*clk_ipg, *clk_axi;
	struct regmap		*iomuxc_gpr;
	struct ipu_pre		*pres[3];

	struct ipu_prg_channel	chan[3];
};

static DEFINE_MUTEX(ipu_prg_list_mutex);
static LIST_HEAD(ipu_prg_list);

struct ipu_prg *
ipu_prg_lookup_by_phandle(struct device *dev, const char *name, int ipu_id)
{
	struct device_node *prg_node = of_parse_phandle(dev->of_node,
							name, 0);
	struct ipu_prg *prg;

	mutex_lock(&ipu_prg_list_mutex);
	list_for_each_entry(prg, &ipu_prg_list, list) {
		if (prg_node == prg->dev->of_node) {
			mutex_unlock(&ipu_prg_list_mutex);
			device_link_add(dev, prg->dev, DL_FLAG_AUTOREMOVE);
			prg->id = ipu_id;
			of_node_put(prg_node);
			return prg;
		}
	}
	mutex_unlock(&ipu_prg_list_mutex);

	of_node_put(prg_node);

	return NULL;
}

int ipu_prg_max_active_channels(void)
{
	return ipu_pre_get_available_count();
}
EXPORT_SYMBOL_GPL(ipu_prg_max_active_channels);

bool ipu_prg_present(struct ipu_soc *ipu)
{
	if (ipu->prg_priv)
		return true;

	return false;
}
EXPORT_SYMBOL_GPL(ipu_prg_present);

bool ipu_prg_format_supported(struct ipu_soc *ipu, uint32_t format,
			      uint64_t modifier)
{
	const struct drm_format_info *info = drm_format_info(format);

	if (info->num_planes != 1)
		return false;

	switch (modifier) {
	case DRM_FORMAT_MOD_LINEAR:
	case DRM_FORMAT_MOD_VIVANTE_TILED:
	case DRM_FORMAT_MOD_VIVANTE_SUPER_TILED:
		return true;
	default:
		return false;
	}
}
EXPORT_SYMBOL_GPL(ipu_prg_format_supported);

int ipu_prg_enable(struct ipu_soc *ipu)
{
	struct ipu_prg *prg = ipu->prg_priv;

	if (!prg)
		return 0;

	return pm_runtime_get_sync(prg->dev);
}
EXPORT_SYMBOL_GPL(ipu_prg_enable);

void ipu_prg_disable(struct ipu_soc *ipu)
{
	struct ipu_prg *prg = ipu->prg_priv;

	if (!prg)
		return;

	pm_runtime_put(prg->dev);
}
EXPORT_SYMBOL_GPL(ipu_prg_disable);

/*
 * The channel configuartion functions below are not thread safe, as they
 * must be only called from the atomic commit path in the DRM driver, which
 * is properly serialized.
 */
static int ipu_prg_ipu_to_prg_chan(int ipu_chan)
{
	/*
	 * This isn't clearly documented in the RM, but IPU to PRG channel
	 * assignment is fixed, as only with this mapping the control signals
	 * match up.
	 */
	switch (ipu_chan) {
	case IPUV3_CHANNEL_MEM_BG_SYNC:
		return 0;
	case IPUV3_CHANNEL_MEM_FG_SYNC:
		return 1;
	case IPUV3_CHANNEL_MEM_DC_SYNC:
		return 2;
	default:
		return -EINVAL;
	}
}

static int ipu_prg_get_pre(struct ipu_prg *prg, int prg_chan)
{
	int i, ret;

	/* channel 0 is special as it is hardwired to one of the PREs */
	if (prg_chan == 0) {
		ret = ipu_pre_get(prg->pres[0]);
		if (ret)
			goto fail;
		prg->chan[prg_chan].used_pre = 0;
		return 0;
	}

	for (i = 1; i < 3; i++) {
		ret = ipu_pre_get(prg->pres[i]);
		if (!ret) {
			u32 val, mux;
			int shift;

			prg->chan[prg_chan].used_pre = i;

			/* configure the PRE to PRG channel mux */
			shift = (i == 1) ? 12 : 14;
			mux = (prg->id << 1) | (prg_chan - 1);
			regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5,
					   0x3 << shift, mux << shift);

			/* check other mux, must not point to same channel */
			shift = (i == 1) ? 14 : 12;
			regmap_read(prg->iomuxc_gpr, IOMUXC_GPR5, &val);
			if (((val >> shift) & 0x3) == mux) {
				regmap_update_bits(prg->iomuxc_gpr, IOMUXC_GPR5,
						   0x3 << shift,
						   (mux ^ 0x1) << shift);
			}

			return 0;
		}
	}

fail:
	dev_err(prg->dev, "could not get PRE for PRG chan %d", prg_chan);
	return ret;
}

static void ipu_prg_put_pre(struct ipu_prg *prg, int prg_chan)
{
	struct ipu_prg_channel *chan = &prg->chan[prg_chan];

	ipu_pre_put(prg->pres[chan->used_pre]);
	chan->used_pre = -1;
}

void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan)
{
	int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
	struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
	struct ipu_prg_channel *chan = &prg->chan[prg_chan];
	u32 val;

	if (!chan->enabled || prg_chan < 0)
		return;

	pm_runtime_get_sync(prg->dev);

	val = readl(prg->regs + IPU_PRG_CTL);
	val |= IPU_PRG_CTL_BYPASS(prg_chan);
	writel(val, prg->regs + IPU_PRG_CTL);

	val = IPU_PRG_REG_UPDATE_REG_UPDATE;
	writel(val, prg->regs + IPU_PRG_REG_UPDATE);

	pm_runtime_put(prg->dev);

	ipu_prg_put_pre(prg, prg_chan);

	chan->enabled = false;
}
EXPORT_SYMBOL_GPL(ipu_prg_channel_disable);

int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
			      unsigned int axi_id, unsigned int width,
			      unsigned int height, unsigned int stride,
			      u32 format, uint64_t modifier, unsigned long *eba)
{
	int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num);
	struct ipu_prg *prg = ipu_chan->ipu->prg_priv;
	struct ipu_prg_channel *chan = &prg->chan[prg_chan];
	u32 val;
	int ret;

	if (prg_chan < 0)
		return prg_chan;

	if (chan->enabled) {
		ipu_pre_update(prg->pres[chan->used_pre], *eba);
		return 0;
	}

	ret = ipu_prg_get_pre(prg, prg_chan);
	if (ret)
		return ret;

	ipu_pre_configure(prg->pres[chan->used_pre],
			  width, height, stride, format, modifier, *eba);


	pm_runtime_get_sync(prg->dev);

	val = (stride - 1) & IPU_PRG_STRIDE_STRIDE_MASK;
	writel(val, prg->regs + IPU_PRG_STRIDE(prg_chan));

	val = ((height & IPU_PRG_HEIGHT_PRE_HEIGHT_MASK) <<
	       IPU_PRG_HEIGHT_PRE_HEIGHT_SHIFT) |
	      ((height & IPU_PRG_HEIGHT_IPU_HEIGHT_MASK) <<
	       IPU_PRG_HEIGHT_IPU_HEIGHT_SHIFT);
	writel(val, prg->regs + IPU_PRG_HEIGHT(prg_chan));

	val = ipu_pre_get_baddr(prg->pres[chan->used_pre]);
	*eba = val;
	writel(val, prg->regs + IPU_PRG_BADDR(prg_chan));

	val = readl(prg->regs + IPU_PRG_CTL);
	/* config AXI ID */
	val &= ~(IPU_PRG_CTL_SOFT_ARID_MASK <<
		 IPU_PRG_CTL_SOFT_ARID_SHIFT(prg_chan));
	val |= IPU_PRG_CTL_SOFT_ARID(prg_chan, axi_id);
	/* enable channel */
	val &= ~IPU_PRG_CTL_BYPASS(prg_chan);
	writel(val, prg->regs + IPU_PRG_CTL);

	val = IPU_PRG_REG_UPDATE_REG_UPDATE;
	writel(val, prg->regs + IPU_PRG_REG_UPDATE);

	/* wait for both double buffers to be filled */
	readl_poll_timeout(prg->regs + IPU_PRG_STATUS, val,
			   (val & IPU_PRG_STATUS_BUFFER0_READY(prg_chan)) &&
			   (val & IPU_PRG_STATUS_BUFFER1_READY(prg_chan)),
			   5, 1000);

	pm_runtime_put(prg->dev);

	chan->enabled = true;
	return 0;
}
EXPORT_SYMBOL_GPL(ipu_prg_channel_configure);

static int ipu_prg_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct ipu_prg *prg;
	u32 val;
	int i, ret;

	prg = devm_kzalloc(dev, sizeof(*prg), GFP_KERNEL);
	if (!prg)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	prg->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(prg->regs))
		return PTR_ERR(prg->regs);


	prg->clk_ipg = devm_clk_get(dev, "ipg");
	if (IS_ERR(prg->clk_ipg))
		return PTR_ERR(prg->clk_ipg);

	prg->clk_axi = devm_clk_get(dev, "axi");
	if (IS_ERR(prg->clk_axi))
		return PTR_ERR(prg->clk_axi);

	prg->iomuxc_gpr =
		syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
	if (IS_ERR(prg->iomuxc_gpr))
		return PTR_ERR(prg->iomuxc_gpr);

	for (i = 0; i < 3; i++) {
		prg->pres[i] = ipu_pre_lookup_by_phandle(dev, "fsl,pres", i);
		if (!prg->pres[i])
			return -EPROBE_DEFER;
	}

	ret = clk_prepare_enable(prg->clk_ipg);
	if (ret)
		return ret;

	ret = clk_prepare_enable(prg->clk_axi);
	if (ret) {
		clk_disable_unprepare(prg->clk_ipg);
		return ret;
	}

	/* init to free running mode */
	val = readl(prg->regs + IPU_PRG_CTL);
	val |= IPU_PRG_CTL_SHADOW_EN;
	writel(val, prg->regs + IPU_PRG_CTL);

	/* disable address threshold */
	writel(0xffffffff, prg->regs + IPU_PRG_THD);

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	prg->dev = dev;
	platform_set_drvdata(pdev, prg);
	mutex_lock(&ipu_prg_list_mutex);
	list_add(&prg->list, &ipu_prg_list);
	mutex_unlock(&ipu_prg_list_mutex);

	return 0;
}

static int ipu_prg_remove(struct platform_device *pdev)
{
	struct ipu_prg *prg = platform_get_drvdata(pdev);

	mutex_lock(&ipu_prg_list_mutex);
	list_del(&prg->list);
	mutex_unlock(&ipu_prg_list_mutex);

	return 0;
}

#ifdef CONFIG_PM
static int prg_suspend(struct device *dev)
{
	struct ipu_prg *prg = dev_get_drvdata(dev);

	clk_disable_unprepare(prg->clk_axi);
	clk_disable_unprepare(prg->clk_ipg);

	return 0;
}

static int prg_resume(struct device *dev)
{
	struct ipu_prg *prg = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(prg->clk_ipg);
	if (ret)
		return ret;

	ret = clk_prepare_enable(prg->clk_axi);
	if (ret) {
		clk_disable_unprepare(prg->clk_ipg);
		return ret;
	}

	return 0;
}
#endif

static const struct dev_pm_ops prg_pm_ops = {
	SET_RUNTIME_PM_OPS(prg_suspend, prg_resume, NULL)
};

static const struct of_device_id ipu_prg_dt_ids[] = {
	{ .compatible = "fsl,imx6qp-prg", },
	{ /* sentinel */ },
};

struct platform_driver ipu_prg_drv = {
	.probe		= ipu_prg_probe,
	.remove		= ipu_prg_remove,
	.driver		= {
		.name	= "imx-ipu-prg",
		.pm	= &prg_pm_ops,
		.of_match_table = ipu_prg_dt_ids,
	},
};
OpenPOWER on IntegriCloud