summaryrefslogtreecommitdiff
path: root/drivers/dma/sh/rcar-audmapp.c
blob: d95bbdd721f40ca859a7b671f7fafccd42b18928 (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
/*
 * This is for Renesas R-Car Audio-DMAC-peri-peri.
 *
 * Copyright (C) 2014 Renesas Electronics Corporation
 * Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * based on the drivers/dma/sh/shdma.c
 *
 * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/of_dma.h>
#include <linux/platform_data/dma-rcar-audmapp.h>
#include <linux/platform_device.h>
#include <linux/shdma-base.h>

/*
 * DMA register
 */
#define PDMASAR		0x00
#define PDMADAR		0x04
#define PDMACHCR	0x0c

/* PDMACHCR */
#define PDMACHCR_DE		(1 << 0)

#define AUDMAPP_MAX_CHANNELS	29

/* Default MEMCPY transfer size = 2^2 = 4 bytes */
#define LOG2_DEFAULT_XFER_SIZE	2
#define AUDMAPP_SLAVE_NUMBER	256
#define AUDMAPP_LEN_MAX		(16 * 1024 * 1024)

struct audmapp_chan {
	struct shdma_chan shdma_chan;
	void __iomem *base;
	dma_addr_t slave_addr;
	u32 chcr;
};

struct audmapp_device {
	struct shdma_dev shdma_dev;
	struct audmapp_pdata *pdata;
	struct device *dev;
	void __iomem *chan_reg;
};

struct audmapp_desc {
	struct shdma_desc shdma_desc;
	dma_addr_t src;
	dma_addr_t dst;
};

#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)

#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
#define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device,	\
				  struct audmapp_device, shdma_dev.dma_dev)

static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
{
	struct audmapp_device *audev = to_dev(auchan);
	struct device *dev = audev->dev;

	dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);

	iowrite32(data, auchan->base + reg);
}

static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
{
	return ioread32(auchan->base + reg);
}

static void audmapp_halt(struct shdma_chan *schan)
{
	struct audmapp_chan *auchan = to_chan(schan);
	int i;

	audmapp_write(auchan, 0, PDMACHCR);

	for (i = 0; i < 1024; i++) {
		if (0 == audmapp_read(auchan, PDMACHCR))
			return;
		udelay(1);
	}
}

static void audmapp_start_xfer(struct shdma_chan *schan,
			       struct shdma_desc *sdesc)
{
	struct audmapp_chan *auchan = to_chan(schan);
	struct audmapp_device *audev = to_dev(auchan);
	struct audmapp_desc *desc = to_desc(sdesc);
	struct device *dev = audev->dev;
	u32 chcr = auchan->chcr | PDMACHCR_DE;

	dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
		&desc->src, &desc->dst, chcr);

	audmapp_write(auchan, desc->src,	PDMASAR);
	audmapp_write(auchan, desc->dst,	PDMADAR);
	audmapp_write(auchan, chcr,	PDMACHCR);
}

static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
			      u32 *chcr, dma_addr_t *dst)
{
	struct audmapp_device *audev = to_dev(auchan);
	struct audmapp_pdata *pdata = audev->pdata;
	struct audmapp_slave_config *cfg;
	int i;

	*chcr	= 0;
	*dst	= 0;

	if (!pdata) { /* DT */
		*chcr = ((u32)slave_id) << 16;
		auchan->shdma_chan.slave_id = (slave_id) >> 8;
		return 0;
	}

	/* non-DT */

	if (slave_id >= AUDMAPP_SLAVE_NUMBER)
		return -ENXIO;

	for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
		if (cfg->slave_id == slave_id) {
			*chcr	= cfg->chcr;
			*dst	= cfg->dst;
			return 0;
		}

	return -ENXIO;
}

static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
			     dma_addr_t slave_addr, bool try)
{
	struct audmapp_chan *auchan = to_chan(schan);
	u32 chcr;
	dma_addr_t dst;
	int ret;

	ret = audmapp_get_config(auchan, slave_id, &chcr, &dst);
	if (ret < 0)
		return ret;

	if (try)
		return 0;

	auchan->chcr		= chcr;
	auchan->slave_addr	= slave_addr ? : dst;

	return 0;
}

static int audmapp_desc_setup(struct shdma_chan *schan,
			      struct shdma_desc *sdesc,
			      dma_addr_t src, dma_addr_t dst, size_t *len)
{
	struct audmapp_desc *desc = to_desc(sdesc);

	if (*len > (size_t)AUDMAPP_LEN_MAX)
		*len = (size_t)AUDMAPP_LEN_MAX;

	desc->src = src;
	desc->dst = dst;

	return 0;
}

static void audmapp_setup_xfer(struct shdma_chan *schan,
			       int slave_id)
{
}

static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
{
	struct audmapp_chan *auchan = to_chan(schan);

	return auchan->slave_addr;
}

static bool audmapp_channel_busy(struct shdma_chan *schan)
{
	struct audmapp_chan *auchan = to_chan(schan);
	u32 chcr = audmapp_read(auchan, PDMACHCR);

	return chcr & ~PDMACHCR_DE;
}

static bool audmapp_desc_completed(struct shdma_chan *schan,
				   struct shdma_desc *sdesc)
{
	return true;
}

static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
{
	return &((struct audmapp_desc *)buf)[i].shdma_desc;
}

static const struct shdma_ops audmapp_shdma_ops = {
	.halt_channel	= audmapp_halt,
	.desc_setup	= audmapp_desc_setup,
	.set_slave	= audmapp_set_slave,
	.start_xfer	= audmapp_start_xfer,
	.embedded_desc	= audmapp_embedded_desc,
	.setup_xfer	= audmapp_setup_xfer,
	.slave_addr	= audmapp_slave_addr,
	.channel_busy	= audmapp_channel_busy,
	.desc_completed	= audmapp_desc_completed,
};

static int audmapp_chan_probe(struct platform_device *pdev,
			      struct audmapp_device *audev, int id)
{
	struct shdma_dev *sdev = &audev->shdma_dev;
	struct audmapp_chan *auchan;
	struct shdma_chan *schan;
	struct device *dev = audev->dev;

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

	schan = &auchan->shdma_chan;
	schan->max_xfer_len = AUDMAPP_LEN_MAX;

	shdma_chan_probe(sdev, schan, id);

	auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
	dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);

	return 0;
}

static void audmapp_chan_remove(struct audmapp_device *audev)
{
	struct shdma_chan *schan;
	int i;

	shdma_for_each_chan(schan, &audev->shdma_dev, i) {
		BUG_ON(!schan);
		shdma_chan_remove(schan);
	}
}

static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
					 struct of_dma *ofdma)
{
	dma_cap_mask_t mask;
	struct dma_chan *chan;
	u32 chcr = dma_spec->args[0];

	if (dma_spec->args_count != 1)
		return NULL;

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	chan = dma_request_channel(mask, shdma_chan_filter, NULL);
	if (chan)
		to_shdma_chan(chan)->hw_req = chcr;

	return chan;
}

static int audmapp_probe(struct platform_device *pdev)
{
	struct audmapp_pdata *pdata = pdev->dev.platform_data;
	struct device_node *np = pdev->dev.of_node;
	struct audmapp_device *audev;
	struct shdma_dev *sdev;
	struct dma_device *dma_dev;
	struct resource *res;
	int err, i;

	if (np)
		of_dma_controller_register(np, audmapp_of_xlate, pdev);
	else if (!pdata)
		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
	if (!audev)
		return -ENOMEM;

	audev->dev	= &pdev->dev;
	audev->pdata	= pdata;
	audev->chan_reg	= devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(audev->chan_reg))
		return PTR_ERR(audev->chan_reg);

	sdev		= &audev->shdma_dev;
	sdev->ops	= &audmapp_shdma_ops;
	sdev->desc_size	= sizeof(struct audmapp_desc);

	dma_dev			= &sdev->dma_dev;
	dma_dev->copy_align	= LOG2_DEFAULT_XFER_SIZE;
	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);

	err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
	if (err < 0)
		return err;

	platform_set_drvdata(pdev, audev);

	/* Create DMA Channel */
	for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
		err = audmapp_chan_probe(pdev, audev, i);
		if (err)
			goto chan_probe_err;
	}

	err = dma_async_device_register(dma_dev);
	if (err < 0)
		goto chan_probe_err;

	return err;

chan_probe_err:
	audmapp_chan_remove(audev);
	shdma_cleanup(sdev);

	return err;
}

static int audmapp_remove(struct platform_device *pdev)
{
	struct audmapp_device *audev = platform_get_drvdata(pdev);
	struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;

	dma_async_device_unregister(dma_dev);

	audmapp_chan_remove(audev);
	shdma_cleanup(&audev->shdma_dev);

	return 0;
}

static const struct of_device_id audmapp_of_match[] = {
	{ .compatible = "renesas,rcar-audmapp", },
	{},
};

static struct platform_driver audmapp_driver = {
	.probe		= audmapp_probe,
	.remove		= audmapp_remove,
	.driver		= {
		.name	= "rcar-audmapp-engine",
		.of_match_table = audmapp_of_match,
	},
};
module_platform_driver(audmapp_driver);

MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
MODULE_LICENSE("GPL");