1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Renesas R-Car Audio DMAC support
4 //
5 // Copyright (C) 2015 Renesas Electronics Corp.
6 // Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 
8 #include <linux/delay.h>
9 #include <linux/of_dma.h>
10 #include "rsnd.h"
11 
12 /*
13  * Audio DMAC peri peri register
14  */
15 #define PDMASAR		0x00
16 #define PDMADAR		0x04
17 #define PDMACHCR	0x0c
18 
19 /* PDMACHCR */
20 #define PDMACHCR_DE		(1 << 0)
21 
22 
23 struct rsnd_dmaen {
24 	struct dma_chan		*chan;
25 	dma_cookie_t		cookie;
26 	unsigned int		dma_len;
27 };
28 
29 struct rsnd_dmapp {
30 	int			dmapp_id;
31 	u32			chcr;
32 };
33 
34 struct rsnd_dma {
35 	struct rsnd_mod		mod;
36 	struct rsnd_mod		*mod_from;
37 	struct rsnd_mod		*mod_to;
38 	dma_addr_t		src_addr;
39 	dma_addr_t		dst_addr;
40 	union {
41 		struct rsnd_dmaen en;
42 		struct rsnd_dmapp pp;
43 	} dma;
44 };
45 
46 struct rsnd_dma_ctrl {
47 	void __iomem *ppbase;
48 	phys_addr_t ppres;
49 	int dmaen_num;
50 	int dmapp_num;
51 };
52 
53 #define rsnd_priv_to_dmac(p)	((struct rsnd_dma_ctrl *)(p)->dma)
54 #define rsnd_mod_to_dma(_mod) container_of((_mod), struct rsnd_dma, mod)
55 #define rsnd_dma_to_dmaen(dma)	(&(dma)->dma.en)
56 #define rsnd_dma_to_dmapp(dma)	(&(dma)->dma.pp)
57 
58 /* for DEBUG */
59 static struct rsnd_mod_ops mem_ops = {
60 	.name = "mem",
61 };
62 
63 static struct rsnd_mod mem = {
64 };
65 
66 /*
67  *		Audio DMAC
68  */
__rsnd_dmaen_complete(struct rsnd_mod * mod,struct rsnd_dai_stream * io)69 static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
70 				  struct rsnd_dai_stream *io)
71 {
72 	if (rsnd_io_is_working(io))
73 		rsnd_dai_period_elapsed(io);
74 }
75 
rsnd_dmaen_complete(void * data)76 static void rsnd_dmaen_complete(void *data)
77 {
78 	struct rsnd_mod *mod = data;
79 
80 	rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
81 }
82 
rsnd_dmaen_request_channel(struct rsnd_dai_stream * io,struct rsnd_mod * mod_from,struct rsnd_mod * mod_to)83 static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
84 						   struct rsnd_mod *mod_from,
85 						   struct rsnd_mod *mod_to)
86 {
87 	if ((!mod_from && !mod_to) ||
88 	    (mod_from && mod_to))
89 		return NULL;
90 
91 	if (mod_from)
92 		return rsnd_mod_dma_req(io, mod_from);
93 	else
94 		return rsnd_mod_dma_req(io, mod_to);
95 }
96 
rsnd_dmaen_stop(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)97 static int rsnd_dmaen_stop(struct rsnd_mod *mod,
98 			   struct rsnd_dai_stream *io,
99 			   struct rsnd_priv *priv)
100 {
101 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
102 	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
103 
104 	if (dmaen->chan)
105 		dmaengine_terminate_async(dmaen->chan);
106 
107 	return 0;
108 }
109 
rsnd_dmaen_cleanup(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)110 static int rsnd_dmaen_cleanup(struct rsnd_mod *mod,
111 			      struct rsnd_dai_stream *io,
112 			      struct rsnd_priv *priv)
113 {
114 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
115 	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
116 
117 	/*
118 	 * DMAEngine release uses mutex lock.
119 	 * Thus, it shouldn't be called under spinlock.
120 	 * Let's call it under prepare
121 	 */
122 	if (dmaen->chan)
123 		dma_release_channel(dmaen->chan);
124 
125 	dmaen->chan = NULL;
126 
127 	return 0;
128 }
129 
rsnd_dmaen_prepare(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)130 static int rsnd_dmaen_prepare(struct rsnd_mod *mod,
131 			      struct rsnd_dai_stream *io,
132 			      struct rsnd_priv *priv)
133 {
134 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
135 	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
136 	struct device *dev = rsnd_priv_to_dev(priv);
137 
138 	/* maybe suspended */
139 	if (dmaen->chan)
140 		return 0;
141 
142 	/*
143 	 * DMAEngine request uses mutex lock.
144 	 * Thus, it shouldn't be called under spinlock.
145 	 * Let's call it under prepare
146 	 */
147 	dmaen->chan = rsnd_dmaen_request_channel(io,
148 						 dma->mod_from,
149 						 dma->mod_to);
150 	if (IS_ERR_OR_NULL(dmaen->chan)) {
151 		dmaen->chan = NULL;
152 		dev_err(dev, "can't get dma channel\n");
153 		return -EIO;
154 	}
155 
156 	return 0;
157 }
158 
rsnd_dmaen_start(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)159 static int rsnd_dmaen_start(struct rsnd_mod *mod,
160 			    struct rsnd_dai_stream *io,
161 			    struct rsnd_priv *priv)
162 {
163 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
164 	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
165 	struct snd_pcm_substream *substream = io->substream;
166 	struct device *dev = rsnd_priv_to_dev(priv);
167 	struct dma_async_tx_descriptor *desc;
168 	struct dma_slave_config cfg = {};
169 	enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
170 	int is_play = rsnd_io_is_play(io);
171 	int ret;
172 
173 	/*
174 	 * in case of monaural data writing or reading through Audio-DMAC
175 	 * data is always in Left Justified format, so both src and dst
176 	 * DMA Bus width need to be set equal to physical data width.
177 	 */
178 	if (rsnd_runtime_channel_original(io) == 1) {
179 		struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
180 		int bits = snd_pcm_format_physical_width(runtime->format);
181 
182 		switch (bits) {
183 		case 8:
184 			buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
185 			break;
186 		case 16:
187 			buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
188 			break;
189 		case 32:
190 			buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
191 			break;
192 		default:
193 			dev_err(dev, "invalid format width %d\n", bits);
194 			return -EINVAL;
195 		}
196 	}
197 
198 	cfg.direction	= is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
199 	cfg.src_addr	= dma->src_addr;
200 	cfg.dst_addr	= dma->dst_addr;
201 	cfg.src_addr_width = buswidth;
202 	cfg.dst_addr_width = buswidth;
203 
204 	dev_dbg(dev, "%s %pad -> %pad\n",
205 		rsnd_mod_name(mod),
206 		&cfg.src_addr, &cfg.dst_addr);
207 
208 	ret = dmaengine_slave_config(dmaen->chan, &cfg);
209 	if (ret < 0)
210 		return ret;
211 
212 	desc = dmaengine_prep_dma_cyclic(dmaen->chan,
213 					 substream->runtime->dma_addr,
214 					 snd_pcm_lib_buffer_bytes(substream),
215 					 snd_pcm_lib_period_bytes(substream),
216 					 is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
217 					 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
218 
219 	if (!desc) {
220 		dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
221 		return -EIO;
222 	}
223 
224 	desc->callback		= rsnd_dmaen_complete;
225 	desc->callback_param	= rsnd_mod_get(dma);
226 
227 	dmaen->dma_len		= snd_pcm_lib_buffer_bytes(substream);
228 
229 	dmaen->cookie = dmaengine_submit(desc);
230 	if (dmaen->cookie < 0) {
231 		dev_err(dev, "dmaengine_submit() fail\n");
232 		return -EIO;
233 	}
234 
235 	dma_async_issue_pending(dmaen->chan);
236 
237 	return 0;
238 }
239 
rsnd_dma_request_channel(struct device_node * of_node,char * name,struct rsnd_mod * mod,char * x)240 struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node, char *name,
241 					  struct rsnd_mod *mod, char *x)
242 {
243 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
244 	struct device *dev = rsnd_priv_to_dev(priv);
245 	struct dma_chan *chan = NULL;
246 	struct device_node *np;
247 	int i = 0;
248 
249 	for_each_child_of_node(of_node, np) {
250 		i = rsnd_node_fixed_index(dev, np, name, i);
251 		if (i < 0) {
252 			chan = NULL;
253 			of_node_put(np);
254 			break;
255 		}
256 
257 		if (i == rsnd_mod_id_raw(mod) && (!chan))
258 			chan = of_dma_request_slave_channel(np, x);
259 		i++;
260 	}
261 
262 	/* It should call of_node_put(), since, it is rsnd_xxx_of_node() */
263 	of_node_put(of_node);
264 
265 	return chan;
266 }
267 
rsnd_dmaen_attach(struct rsnd_dai_stream * io,struct rsnd_dma * dma,struct rsnd_mod * mod_from,struct rsnd_mod * mod_to)268 static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
269 			   struct rsnd_dma *dma,
270 			   struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
271 {
272 	struct rsnd_priv *priv = rsnd_io_to_priv(io);
273 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
274 	struct dma_chan *chan;
275 
276 	/* try to get DMAEngine channel */
277 	chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
278 	if (IS_ERR_OR_NULL(chan)) {
279 		/* Let's follow when -EPROBE_DEFER case */
280 		if (PTR_ERR(chan) == -EPROBE_DEFER)
281 			return PTR_ERR(chan);
282 
283 		/*
284 		 * DMA failed. try to PIO mode
285 		 * see
286 		 *	rsnd_ssi_fallback()
287 		 *	rsnd_rdai_continuance_probe()
288 		 */
289 		return -EAGAIN;
290 	}
291 
292 	/*
293 	 * use it for IPMMU if needed
294 	 * see
295 	 *	rsnd_preallocate_pages()
296 	 */
297 	io->dmac_dev = chan->device->dev;
298 
299 	dma_release_channel(chan);
300 
301 	dmac->dmaen_num++;
302 
303 	return 0;
304 }
305 
rsnd_dmaen_pointer(struct rsnd_mod * mod,struct rsnd_dai_stream * io,snd_pcm_uframes_t * pointer)306 static int rsnd_dmaen_pointer(struct rsnd_mod *mod,
307 			      struct rsnd_dai_stream *io,
308 			      snd_pcm_uframes_t *pointer)
309 {
310 	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
311 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
312 	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
313 	struct dma_tx_state state;
314 	enum dma_status status;
315 	unsigned int pos = 0;
316 
317 	status = dmaengine_tx_status(dmaen->chan, dmaen->cookie, &state);
318 	if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
319 		if (state.residue > 0 && state.residue <= dmaen->dma_len)
320 			pos = dmaen->dma_len - state.residue;
321 	}
322 	*pointer = bytes_to_frames(runtime, pos);
323 
324 	return 0;
325 }
326 
327 static struct rsnd_mod_ops rsnd_dmaen_ops = {
328 	.name		= "audmac",
329 	.prepare	= rsnd_dmaen_prepare,
330 	.cleanup	= rsnd_dmaen_cleanup,
331 	.start		= rsnd_dmaen_start,
332 	.stop		= rsnd_dmaen_stop,
333 	.pointer	= rsnd_dmaen_pointer,
334 	.get_status	= rsnd_mod_get_status,
335 };
336 
337 /*
338  *		Audio DMAC peri peri
339  */
340 static const u8 gen2_id_table_ssiu[] = {
341 	/* SSI00 ~ SSI07 */
342 	0x00, 0x01, 0x02, 0x03, 0x39, 0x3a, 0x3b, 0x3c,
343 	/* SSI10 ~ SSI17 */
344 	0x04, 0x05, 0x06, 0x07, 0x3d, 0x3e, 0x3f, 0x40,
345 	/* SSI20 ~ SSI27 */
346 	0x08, 0x09, 0x0a, 0x0b, 0x41, 0x42, 0x43, 0x44,
347 	/* SSI30 ~ SSI37 */
348 	0x0c, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b,
349 	/* SSI40 ~ SSI47 */
350 	0x0d, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52,
351 	/* SSI5 */
352 	0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
353 	/* SSI6 */
354 	0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
355 	/* SSI7 */
356 	0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
357 	/* SSI8 */
358 	0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
359 	/* SSI90 ~ SSI97 */
360 	0x12, 0x13, 0x14, 0x15, 0x53, 0x54, 0x55, 0x56,
361 };
362 static const u8 gen2_id_table_scu[] = {
363 	0x2d, /* SCU_SRCI0 */
364 	0x2e, /* SCU_SRCI1 */
365 	0x2f, /* SCU_SRCI2 */
366 	0x30, /* SCU_SRCI3 */
367 	0x31, /* SCU_SRCI4 */
368 	0x32, /* SCU_SRCI5 */
369 	0x33, /* SCU_SRCI6 */
370 	0x34, /* SCU_SRCI7 */
371 	0x35, /* SCU_SRCI8 */
372 	0x36, /* SCU_SRCI9 */
373 };
374 static const u8 gen2_id_table_cmd[] = {
375 	0x37, /* SCU_CMD0 */
376 	0x38, /* SCU_CMD1 */
377 };
378 
rsnd_dmapp_get_id(struct rsnd_dai_stream * io,struct rsnd_mod * mod)379 static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
380 			     struct rsnd_mod *mod)
381 {
382 	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
383 	struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
384 	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
385 	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
386 	const u8 *entry = NULL;
387 	int id = 255;
388 	int size = 0;
389 
390 	if ((mod == ssi) ||
391 	    (mod == ssiu)) {
392 		int busif = rsnd_mod_id_sub(ssiu);
393 
394 		entry = gen2_id_table_ssiu;
395 		size = ARRAY_SIZE(gen2_id_table_ssiu);
396 		id = (rsnd_mod_id(mod) * 8) + busif;
397 	} else if (mod == src) {
398 		entry = gen2_id_table_scu;
399 		size = ARRAY_SIZE(gen2_id_table_scu);
400 		id = rsnd_mod_id(mod);
401 	} else if (mod == dvc) {
402 		entry = gen2_id_table_cmd;
403 		size = ARRAY_SIZE(gen2_id_table_cmd);
404 		id = rsnd_mod_id(mod);
405 	}
406 
407 	if ((!entry) || (size <= id)) {
408 		struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
409 
410 		dev_err(dev, "unknown connection (%s)\n", rsnd_mod_name(mod));
411 
412 		/* use non-prohibited SRS number as error */
413 		return 0x00; /* SSI00 */
414 	}
415 
416 	return entry[id];
417 }
418 
rsnd_dmapp_get_chcr(struct rsnd_dai_stream * io,struct rsnd_mod * mod_from,struct rsnd_mod * mod_to)419 static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
420 			       struct rsnd_mod *mod_from,
421 			       struct rsnd_mod *mod_to)
422 {
423 	return	(rsnd_dmapp_get_id(io, mod_from) << 24) +
424 		(rsnd_dmapp_get_id(io, mod_to) << 16);
425 }
426 
427 #define rsnd_dmapp_addr(dmac, dma, reg) \
428 	(dmac->ppbase + 0x20 + reg + \
429 	 (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
rsnd_dmapp_write(struct rsnd_dma * dma,u32 data,u32 reg)430 static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
431 {
432 	struct rsnd_mod *mod = rsnd_mod_get(dma);
433 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
434 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
435 	struct device *dev = rsnd_priv_to_dev(priv);
436 
437 	dev_dbg(dev, "w 0x%px : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
438 
439 	iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
440 }
441 
rsnd_dmapp_read(struct rsnd_dma * dma,u32 reg)442 static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
443 {
444 	struct rsnd_mod *mod = rsnd_mod_get(dma);
445 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
446 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
447 
448 	return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
449 }
450 
rsnd_dmapp_bset(struct rsnd_dma * dma,u32 data,u32 mask,u32 reg)451 static void rsnd_dmapp_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
452 {
453 	struct rsnd_mod *mod = rsnd_mod_get(dma);
454 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
455 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
456 	void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
457 	u32 val = ioread32(addr);
458 
459 	val &= ~mask;
460 	val |= (data & mask);
461 
462 	iowrite32(val, addr);
463 }
464 
rsnd_dmapp_stop(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)465 static int rsnd_dmapp_stop(struct rsnd_mod *mod,
466 			   struct rsnd_dai_stream *io,
467 			   struct rsnd_priv *priv)
468 {
469 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
470 	int i;
471 
472 	rsnd_dmapp_bset(dma, 0,  PDMACHCR_DE, PDMACHCR);
473 
474 	for (i = 0; i < 1024; i++) {
475 		if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
476 			return 0;
477 		udelay(1);
478 	}
479 
480 	return -EIO;
481 }
482 
rsnd_dmapp_start(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)483 static int rsnd_dmapp_start(struct rsnd_mod *mod,
484 			    struct rsnd_dai_stream *io,
485 			    struct rsnd_priv *priv)
486 {
487 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
488 	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
489 
490 	rsnd_dmapp_write(dma, dma->src_addr,	PDMASAR);
491 	rsnd_dmapp_write(dma, dma->dst_addr,	PDMADAR);
492 	rsnd_dmapp_write(dma, dmapp->chcr,	PDMACHCR);
493 
494 	return 0;
495 }
496 
rsnd_dmapp_attach(struct rsnd_dai_stream * io,struct rsnd_dma * dma,struct rsnd_mod * mod_from,struct rsnd_mod * mod_to)497 static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
498 			     struct rsnd_dma *dma,
499 			     struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
500 {
501 	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
502 	struct rsnd_priv *priv = rsnd_io_to_priv(io);
503 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
504 	struct device *dev = rsnd_priv_to_dev(priv);
505 
506 	dmapp->dmapp_id = dmac->dmapp_num;
507 	dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
508 
509 	dmac->dmapp_num++;
510 
511 	dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
512 		dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
513 
514 	return 0;
515 }
516 
517 #ifdef CONFIG_DEBUG_FS
rsnd_dmapp_debug_info(struct seq_file * m,struct rsnd_dai_stream * io,struct rsnd_mod * mod)518 static void rsnd_dmapp_debug_info(struct seq_file *m,
519 				  struct rsnd_dai_stream *io,
520 				  struct rsnd_mod *mod)
521 {
522 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
523 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
524 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
525 	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
526 
527 	rsnd_debugfs_reg_show(m, dmac->ppres, dmac->ppbase,
528 			      0x20 + 0x10 * dmapp->dmapp_id, 0x10);
529 }
530 #define DEBUG_INFO .debug_info = rsnd_dmapp_debug_info
531 #else
532 #define DEBUG_INFO
533 #endif
534 
535 static struct rsnd_mod_ops rsnd_dmapp_ops = {
536 	.name		= "audmac-pp",
537 	.start		= rsnd_dmapp_start,
538 	.stop		= rsnd_dmapp_stop,
539 	.quit		= rsnd_dmapp_stop,
540 	.get_status	= rsnd_mod_get_status,
541 	DEBUG_INFO
542 };
543 
544 /*
545  *		Common DMAC Interface
546  */
547 
548 /*
549  *	DMA read/write register offset
550  *
551  *	RSND_xxx_I_N	for Audio DMAC input
552  *	RSND_xxx_O_N	for Audio DMAC output
553  *	RSND_xxx_I_P	for Audio DMAC peri peri input
554  *	RSND_xxx_O_P	for Audio DMAC peri peri output
555  *
556  *	ex) R-Car H2 case
557  *	      mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
558  *	SSI : 0xec541000 / 0xec241008 / 0xec24100c
559  *	SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
560  *	SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
561  *	CMD : 0xec500000 /            / 0xec008000                0xec308000
562  */
563 #define RDMA_SSI_I_N(addr, i)	(addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
564 #define RDMA_SSI_O_N(addr, i)	(addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
565 
566 #define RDMA_SSIU_I_N(addr, i, j) (addr ##_reg - 0x00441000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
567 #define RDMA_SSIU_O_N(addr, i, j) RDMA_SSIU_I_N(addr, i, j)
568 
569 #define RDMA_SSIU_I_P(addr, i, j) (addr ##_reg - 0x00141000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
570 #define RDMA_SSIU_O_P(addr, i, j) RDMA_SSIU_I_P(addr, i, j)
571 
572 #define RDMA_SRC_I_N(addr, i)	(addr ##_reg - 0x00500000 + (0x400 * i))
573 #define RDMA_SRC_O_N(addr, i)	(addr ##_reg - 0x004fc000 + (0x400 * i))
574 
575 #define RDMA_SRC_I_P(addr, i)	(addr ##_reg - 0x00200000 + (0x400 * i))
576 #define RDMA_SRC_O_P(addr, i)	(addr ##_reg - 0x001fc000 + (0x400 * i))
577 
578 #define RDMA_CMD_O_N(addr, i)	(addr ##_reg - 0x004f8000 + (0x400 * i))
579 #define RDMA_CMD_O_P(addr, i)	(addr ##_reg - 0x001f8000 + (0x400 * i))
580 
581 static dma_addr_t
rsnd_gen2_dma_addr(struct rsnd_dai_stream * io,struct rsnd_mod * mod,int is_play,int is_from)582 rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
583 		   struct rsnd_mod *mod,
584 		   int is_play, int is_from)
585 {
586 	struct rsnd_priv *priv = rsnd_io_to_priv(io);
587 	struct device *dev = rsnd_priv_to_dev(priv);
588 	phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
589 	phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
590 	int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod) ||
591 		     !!(rsnd_io_to_mod_ssiu(io) == mod);
592 	int use_src = !!rsnd_io_to_mod_src(io);
593 	int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
594 		      !!rsnd_io_to_mod_mix(io) ||
595 		      !!rsnd_io_to_mod_ctu(io);
596 	int id = rsnd_mod_id(mod);
597 	int busif = rsnd_mod_id_sub(rsnd_io_to_mod_ssiu(io));
598 	struct dma_addr {
599 		dma_addr_t out_addr;
600 		dma_addr_t in_addr;
601 	} dma_addrs[3][2][3] = {
602 		/* SRC */
603 		/* Capture */
604 		{{{ 0,				0 },
605 		  { RDMA_SRC_O_N(src, id),	RDMA_SRC_I_P(src, id) },
606 		  { RDMA_CMD_O_N(src, id),	RDMA_SRC_I_P(src, id) } },
607 		 /* Playback */
608 		 {{ 0,				0, },
609 		  { RDMA_SRC_O_P(src, id),	RDMA_SRC_I_N(src, id) },
610 		  { RDMA_CMD_O_P(src, id),	RDMA_SRC_I_N(src, id) } }
611 		},
612 		/* SSI */
613 		/* Capture */
614 		{{{ RDMA_SSI_O_N(ssi, id),		0 },
615 		  { RDMA_SSIU_O_P(ssi, id, busif),	0 },
616 		  { RDMA_SSIU_O_P(ssi, id, busif),	0 } },
617 		 /* Playback */
618 		 {{ 0,			RDMA_SSI_I_N(ssi, id) },
619 		  { 0,			RDMA_SSIU_I_P(ssi, id, busif) },
620 		  { 0,			RDMA_SSIU_I_P(ssi, id, busif) } }
621 		},
622 		/* SSIU */
623 		/* Capture */
624 		{{{ RDMA_SSIU_O_N(ssi, id, busif),	0 },
625 		  { RDMA_SSIU_O_P(ssi, id, busif),	0 },
626 		  { RDMA_SSIU_O_P(ssi, id, busif),	0 } },
627 		 /* Playback */
628 		 {{ 0,			RDMA_SSIU_I_N(ssi, id, busif) },
629 		  { 0,			RDMA_SSIU_I_P(ssi, id, busif) },
630 		  { 0,			RDMA_SSIU_I_P(ssi, id, busif) } } },
631 	};
632 
633 	/*
634 	 * FIXME
635 	 *
636 	 * We can't support SSI9-4/5/6/7, because its address is
637 	 * out of calculation rule
638 	 */
639 	if ((id == 9) && (busif >= 4))
640 		dev_err(dev, "This driver doesn't support SSI%d-%d, so far",
641 			id, busif);
642 
643 	/* it shouldn't happen */
644 	if (use_cmd && !use_src)
645 		dev_err(dev, "DVC is selected without SRC\n");
646 
647 	/* use SSIU or SSI ? */
648 	if (is_ssi && rsnd_ssi_use_busif(io))
649 		is_ssi++;
650 
651 	return (is_from) ?
652 		dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
653 		dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
654 }
655 
rsnd_dma_addr(struct rsnd_dai_stream * io,struct rsnd_mod * mod,int is_play,int is_from)656 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
657 				struct rsnd_mod *mod,
658 				int is_play, int is_from)
659 {
660 	struct rsnd_priv *priv = rsnd_io_to_priv(io);
661 
662 	/*
663 	 * gen1 uses default DMA addr
664 	 */
665 	if (rsnd_is_gen1(priv))
666 		return 0;
667 
668 	if (!mod)
669 		return 0;
670 
671 	return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
672 }
673 
674 #define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
rsnd_dma_of_path(struct rsnd_mod * this,struct rsnd_dai_stream * io,int is_play,struct rsnd_mod ** mod_from,struct rsnd_mod ** mod_to)675 static void rsnd_dma_of_path(struct rsnd_mod *this,
676 			     struct rsnd_dai_stream *io,
677 			     int is_play,
678 			     struct rsnd_mod **mod_from,
679 			     struct rsnd_mod **mod_to)
680 {
681 	struct rsnd_mod *ssi;
682 	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
683 	struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
684 	struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
685 	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
686 	struct rsnd_mod *mod[MOD_MAX];
687 	struct rsnd_mod *mod_start, *mod_end;
688 	struct rsnd_priv *priv = rsnd_mod_to_priv(this);
689 	struct device *dev = rsnd_priv_to_dev(priv);
690 	int nr, i, idx;
691 
692 	/*
693 	 * It should use "rcar_sound,ssiu" on DT.
694 	 * But, we need to keep compatibility for old version.
695 	 *
696 	 * If it has "rcar_sound.ssiu", it will be used.
697 	 * If not, "rcar_sound.ssi" will be used.
698 	 * see
699 	 *	rsnd_ssiu_dma_req()
700 	 *	rsnd_ssi_dma_req()
701 	 */
702 	if (rsnd_ssiu_of_node(priv)) {
703 		struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
704 
705 		/* use SSIU */
706 		ssi = ssiu;
707 		if (this == rsnd_io_to_mod_ssi(io))
708 			this = ssiu;
709 	} else {
710 		/* keep compatible, use SSI */
711 		ssi = rsnd_io_to_mod_ssi(io);
712 	}
713 
714 	if (!ssi)
715 		return;
716 
717 	nr = 0;
718 	for (i = 0; i < MOD_MAX; i++) {
719 		mod[i] = NULL;
720 		nr += !!rsnd_io_to_mod(io, i);
721 	}
722 
723 	/*
724 	 * [S] -*-> [E]
725 	 * [S] -*-> SRC -o-> [E]
726 	 * [S] -*-> SRC -> DVC -o-> [E]
727 	 * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
728 	 *
729 	 * playback	[S] = mem
730 	 *		[E] = SSI
731 	 *
732 	 * capture	[S] = SSI
733 	 *		[E] = mem
734 	 *
735 	 * -*->		Audio DMAC
736 	 * -o->		Audio DMAC peri peri
737 	 */
738 	mod_start	= (is_play) ? NULL : ssi;
739 	mod_end		= (is_play) ? ssi  : NULL;
740 
741 	idx = 0;
742 	mod[idx++] = mod_start;
743 	for (i = 1; i < nr; i++) {
744 		if (src) {
745 			mod[idx++] = src;
746 			src = NULL;
747 		} else if (ctu) {
748 			mod[idx++] = ctu;
749 			ctu = NULL;
750 		} else if (mix) {
751 			mod[idx++] = mix;
752 			mix = NULL;
753 		} else if (dvc) {
754 			mod[idx++] = dvc;
755 			dvc = NULL;
756 		}
757 	}
758 	mod[idx] = mod_end;
759 
760 	/*
761 	 *		| SSI | SRC |
762 	 * -------------+-----+-----+
763 	 *  is_play	|  o  |  *  |
764 	 * !is_play	|  *  |  o  |
765 	 */
766 	if ((this == ssi) == (is_play)) {
767 		*mod_from	= mod[idx - 1];
768 		*mod_to		= mod[idx];
769 	} else {
770 		*mod_from	= mod[0];
771 		*mod_to		= mod[1];
772 	}
773 
774 	dev_dbg(dev, "module connection (this is %s)\n", rsnd_mod_name(this));
775 	for (i = 0; i <= idx; i++) {
776 		dev_dbg(dev, "  %s%s\n",
777 			rsnd_mod_name(mod[i] ? mod[i] : &mem),
778 			(mod[i] == *mod_from) ? " from" :
779 			(mod[i] == *mod_to)   ? " to" : "");
780 	}
781 }
782 
rsnd_dma_alloc(struct rsnd_dai_stream * io,struct rsnd_mod * mod,struct rsnd_mod ** dma_mod)783 static int rsnd_dma_alloc(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
784 			  struct rsnd_mod **dma_mod)
785 {
786 	struct rsnd_mod *mod_from = NULL;
787 	struct rsnd_mod *mod_to = NULL;
788 	struct rsnd_priv *priv = rsnd_io_to_priv(io);
789 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
790 	struct device *dev = rsnd_priv_to_dev(priv);
791 	struct rsnd_dma *dma;
792 	struct rsnd_mod_ops *ops;
793 	enum rsnd_mod_type type;
794 	int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma,
795 		      struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
796 	int is_play = rsnd_io_is_play(io);
797 	int ret, dma_id;
798 
799 	/*
800 	 * DMA failed. try to PIO mode
801 	 * see
802 	 *	rsnd_ssi_fallback()
803 	 *	rsnd_rdai_continuance_probe()
804 	 */
805 	if (!dmac)
806 		return -EAGAIN;
807 
808 	rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
809 
810 	/* for Gen2 or later */
811 	if (mod_from && mod_to) {
812 		ops	= &rsnd_dmapp_ops;
813 		attach	= rsnd_dmapp_attach;
814 		dma_id	= dmac->dmapp_num;
815 		type	= RSND_MOD_AUDMAPP;
816 	} else {
817 		ops	= &rsnd_dmaen_ops;
818 		attach	= rsnd_dmaen_attach;
819 		dma_id	= dmac->dmaen_num;
820 		type	= RSND_MOD_AUDMA;
821 	}
822 
823 	/* for Gen1, overwrite */
824 	if (rsnd_is_gen1(priv)) {
825 		ops	= &rsnd_dmaen_ops;
826 		attach	= rsnd_dmaen_attach;
827 		dma_id	= dmac->dmaen_num;
828 		type	= RSND_MOD_AUDMA;
829 	}
830 
831 	dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
832 	if (!dma)
833 		return -ENOMEM;
834 
835 	*dma_mod = rsnd_mod_get(dma);
836 
837 	ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
838 			    type, dma_id);
839 	if (ret < 0)
840 		return ret;
841 
842 	dev_dbg(dev, "%s %s -> %s\n",
843 		rsnd_mod_name(*dma_mod),
844 		rsnd_mod_name(mod_from ? mod_from : &mem),
845 		rsnd_mod_name(mod_to   ? mod_to   : &mem));
846 
847 	ret = attach(io, dma, mod_from, mod_to);
848 	if (ret < 0)
849 		return ret;
850 
851 	dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
852 	dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
853 	dma->mod_from = mod_from;
854 	dma->mod_to   = mod_to;
855 
856 	return 0;
857 }
858 
rsnd_dma_attach(struct rsnd_dai_stream * io,struct rsnd_mod * mod,struct rsnd_mod ** dma_mod)859 int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
860 		    struct rsnd_mod **dma_mod)
861 {
862 	if (!(*dma_mod)) {
863 		int ret = rsnd_dma_alloc(io, mod, dma_mod);
864 
865 		if (ret < 0)
866 			return ret;
867 	}
868 
869 	return rsnd_dai_connect(*dma_mod, io, (*dma_mod)->type);
870 }
871 
rsnd_dma_probe(struct rsnd_priv * priv)872 int rsnd_dma_probe(struct rsnd_priv *priv)
873 {
874 	struct platform_device *pdev = rsnd_priv_to_pdev(priv);
875 	struct device *dev = rsnd_priv_to_dev(priv);
876 	struct rsnd_dma_ctrl *dmac;
877 	struct resource *res;
878 
879 	/*
880 	 * for Gen1
881 	 */
882 	if (rsnd_is_gen1(priv))
883 		return 0;
884 
885 	/*
886 	 * for Gen2 or later
887 	 */
888 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
889 	dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
890 	if (!dmac || !res) {
891 		dev_err(dev, "dma allocate failed\n");
892 		return 0; /* it will be PIO mode */
893 	}
894 
895 	dmac->dmapp_num = 0;
896 	dmac->ppres  = res->start;
897 	dmac->ppbase = devm_ioremap_resource(dev, res);
898 	if (IS_ERR(dmac->ppbase))
899 		return PTR_ERR(dmac->ppbase);
900 
901 	priv->dma = dmac;
902 
903 	/* dummy mem mod for debug */
904 	return rsnd_mod_init(NULL, &mem, &mem_ops, NULL, 0, 0);
905 }
906