1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Renesas R-Car SSIU support
4 //
5 // Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6
7 #include "rsnd.h"
8
9 #define SSIU_NAME "ssiu"
10
11 struct rsnd_ssiu {
12 struct rsnd_mod mod;
13 u32 busif_status[8]; /* for BUSIF0 - BUSIF7 */
14 unsigned int usrcnt;
15 int id;
16 int id_sub;
17 };
18
19 /* SSI_MODE */
20 #define TDM_EXT (1 << 0)
21 #define TDM_SPLIT (1 << 8)
22
23 #define rsnd_ssiu_nr(priv) ((priv)->ssiu_nr)
24 #define rsnd_mod_to_ssiu(_mod) container_of((_mod), struct rsnd_ssiu, mod)
25 #define for_each_rsnd_ssiu(pos, priv, i) \
26 for (i = 0; \
27 (i < rsnd_ssiu_nr(priv)) && \
28 ((pos) = ((struct rsnd_ssiu *)(priv)->ssiu + i)); \
29 i++)
30
31 /*
32 * SSI Gen2 Gen3 Gen4
33 * 0 BUSIF0-3 BUSIF0-7 BUSIF0-7
34 * 1 BUSIF0-3 BUSIF0-7
35 * 2 BUSIF0-3 BUSIF0-7
36 * 3 BUSIF0 BUSIF0-7
37 * 4 BUSIF0 BUSIF0-7
38 * 5 BUSIF0 BUSIF0
39 * 6 BUSIF0 BUSIF0
40 * 7 BUSIF0 BUSIF0
41 * 8 BUSIF0 BUSIF0
42 * 9 BUSIF0-3 BUSIF0-7
43 * total 22 52 8
44 */
45 static const int gen2_id[] = { 0, 4, 8, 12, 13, 14, 15, 16, 17, 18 };
46 static const int gen3_id[] = { 0, 8, 16, 24, 32, 40, 41, 42, 43, 44 };
47 static const int gen4_id[] = { 0 };
48
49 /* enable busif buffer over/under run interrupt. */
50 #define rsnd_ssiu_busif_err_irq_enable(mod) rsnd_ssiu_busif_err_irq_ctrl(mod, 1)
51 #define rsnd_ssiu_busif_err_irq_disable(mod) rsnd_ssiu_busif_err_irq_ctrl(mod, 0)
rsnd_ssiu_busif_err_irq_ctrl(struct rsnd_mod * mod,int enable)52 static void rsnd_ssiu_busif_err_irq_ctrl(struct rsnd_mod *mod, int enable)
53 {
54 int id = rsnd_mod_id(mod);
55 int shift, offset;
56 int i;
57
58 switch (id) {
59 case 0:
60 case 1:
61 case 2:
62 case 3:
63 case 4:
64 shift = id;
65 offset = 0;
66 break;
67 case 9:
68 shift = 1;
69 offset = 1;
70 break;
71 default:
72 return;
73 }
74
75 for (i = 0; i < 4; i++) {
76 enum rsnd_reg reg = SSI_SYS_INT_ENABLE((i * 2) + offset);
77 u32 val = 0xf << (shift * 4);
78 u32 sys_int_enable = rsnd_mod_read(mod, reg);
79
80 if (enable)
81 sys_int_enable |= val;
82 else
83 sys_int_enable &= ~val;
84 rsnd_mod_write(mod, reg, sys_int_enable);
85 }
86 }
87
rsnd_ssiu_busif_err_status_clear(struct rsnd_mod * mod)88 bool rsnd_ssiu_busif_err_status_clear(struct rsnd_mod *mod)
89 {
90 bool error = false;
91 int id = rsnd_mod_id(mod);
92 int shift, offset;
93 int i;
94
95 switch (id) {
96 case 0:
97 case 1:
98 case 2:
99 case 3:
100 case 4:
101 shift = id;
102 offset = 0;
103 break;
104 case 9:
105 shift = 1;
106 offset = 1;
107 break;
108 default:
109 goto out;
110 }
111
112 for (i = 0; i < 4; i++) {
113 u32 reg = SSI_SYS_STATUS(i * 2) + offset;
114 u32 status = rsnd_mod_read(mod, reg);
115 u32 val = 0xf << (shift * 4);
116
117 status &= val;
118 if (status) {
119 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
120 struct device *dev = rsnd_priv_to_dev(priv);
121
122 rsnd_print_irq_status(dev, "%s err status : 0x%08x\n",
123 rsnd_mod_name(mod), status);
124 error = true;
125 }
126 rsnd_mod_write(mod, reg, val);
127 }
128 out:
129 return error;
130 }
131
rsnd_ssiu_get_status(struct rsnd_mod * mod,struct rsnd_dai_stream * io,enum rsnd_mod_type type)132 static u32 *rsnd_ssiu_get_status(struct rsnd_mod *mod,
133 struct rsnd_dai_stream *io,
134 enum rsnd_mod_type type)
135 {
136 struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
137 int busif = rsnd_mod_id_sub(mod);
138
139 return &ssiu->busif_status[busif];
140 }
141
rsnd_ssiu_init(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)142 static int rsnd_ssiu_init(struct rsnd_mod *mod,
143 struct rsnd_dai_stream *io,
144 struct rsnd_priv *priv)
145 {
146 struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
147 u32 ssis = rsnd_ssi_multi_secondaries_runtime(io);
148 int use_busif = rsnd_ssi_use_busif(io);
149 int id = rsnd_mod_id(mod);
150 int is_clk_master = rsnd_rdai_is_clk_master(rdai);
151 u32 val1, val2;
152
153 /* clear status */
154 rsnd_ssiu_busif_err_status_clear(mod);
155
156 /* Gen4 doesn't have SSI_MODE */
157 if (rsnd_is_gen4(priv))
158 goto ssi_mode_setting_end;
159
160 /*
161 * SSI_MODE0
162 */
163 rsnd_mod_bset(mod, SSI_MODE0, (1 << id), !use_busif << id);
164
165 /*
166 * SSI_MODE1 / SSI_MODE2
167 *
168 * FIXME
169 * sharing/multi with SSI0 are mainly supported
170 */
171 val1 = rsnd_mod_read(mod, SSI_MODE1);
172 val2 = rsnd_mod_read(mod, SSI_MODE2);
173 if (rsnd_ssi_is_pin_sharing(io)) {
174
175 ssis |= (1 << id);
176
177 } else if (ssis) {
178 /*
179 * Multi SSI
180 *
181 * set synchronized bit here
182 */
183
184 /* SSI4 is synchronized with SSI3 */
185 if (ssis & (1 << 4))
186 val1 |= (1 << 20);
187 /* SSI012 are synchronized */
188 if (ssis == 0x0006)
189 val1 |= (1 << 4);
190 /* SSI0129 are synchronized */
191 if (ssis == 0x0206)
192 val2 |= (1 << 4);
193 }
194
195 /* SSI1 is sharing pin with SSI0 */
196 if (ssis & (1 << 1))
197 val1 |= is_clk_master ? 0x2 : 0x1;
198
199 /* SSI2 is sharing pin with SSI0 */
200 if (ssis & (1 << 2))
201 val1 |= is_clk_master ? 0x2 << 2 :
202 0x1 << 2;
203 /* SSI4 is sharing pin with SSI3 */
204 if (ssis & (1 << 4))
205 val1 |= is_clk_master ? 0x2 << 16 :
206 0x1 << 16;
207 /* SSI9 is sharing pin with SSI0 */
208 if (ssis & (1 << 9))
209 val2 |= is_clk_master ? 0x2 : 0x1;
210
211 rsnd_mod_bset(mod, SSI_MODE1, 0x0013001f, val1);
212 rsnd_mod_bset(mod, SSI_MODE2, 0x00000017, val2);
213
214 ssi_mode_setting_end:
215 /*
216 * Enable busif buffer over/under run interrupt.
217 * It will be handled from ssi.c
218 * see
219 * __rsnd_ssi_interrupt()
220 */
221 rsnd_ssiu_busif_err_irq_enable(mod);
222
223 return 0;
224 }
225
rsnd_ssiu_quit(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)226 static int rsnd_ssiu_quit(struct rsnd_mod *mod,
227 struct rsnd_dai_stream *io,
228 struct rsnd_priv *priv)
229 {
230 /* disable busif buffer over/under run interrupt. */
231 rsnd_ssiu_busif_err_irq_disable(mod);
232
233 return 0;
234 }
235
236 static struct rsnd_mod_ops rsnd_ssiu_ops_gen1 = {
237 .name = SSIU_NAME,
238 .init = rsnd_ssiu_init,
239 .quit = rsnd_ssiu_quit,
240 .get_status = rsnd_ssiu_get_status,
241 };
242
rsnd_ssiu_init_gen2(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)243 static int rsnd_ssiu_init_gen2(struct rsnd_mod *mod,
244 struct rsnd_dai_stream *io,
245 struct rsnd_priv *priv)
246 {
247 struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
248 u32 has_hdmi0 = rsnd_flags_has(io, RSND_STREAM_HDMI0);
249 u32 has_hdmi1 = rsnd_flags_has(io, RSND_STREAM_HDMI1);
250 int ret;
251 u32 mode = 0;
252
253 ret = rsnd_ssiu_init(mod, io, priv);
254 if (ret < 0)
255 return ret;
256
257 ssiu->usrcnt++;
258
259 /*
260 * TDM Extend/Split Mode
261 * see
262 * rsnd_ssi_config_init()
263 */
264 if (rsnd_runtime_is_tdm(io))
265 mode = TDM_EXT;
266 else if (rsnd_runtime_is_tdm_split(io))
267 mode = TDM_SPLIT;
268
269 rsnd_mod_write(mod, SSI_MODE, mode);
270
271 if (rsnd_ssi_use_busif(io)) {
272 int id = rsnd_mod_id(mod);
273 int busif = rsnd_mod_id_sub(mod);
274 enum rsnd_reg adinr_reg, mode_reg, dalign_reg;
275
276 if ((id == 9) && (busif >= 4)) {
277 adinr_reg = SSI9_BUSIF_ADINR(busif);
278 mode_reg = SSI9_BUSIF_MODE(busif);
279 dalign_reg = SSI9_BUSIF_DALIGN(busif);
280 } else {
281 adinr_reg = SSI_BUSIF_ADINR(busif);
282 mode_reg = SSI_BUSIF_MODE(busif);
283 dalign_reg = SSI_BUSIF_DALIGN(busif);
284 }
285
286 rsnd_mod_write(mod, adinr_reg,
287 rsnd_get_adinr_bit(mod, io) |
288 (rsnd_io_is_play(io) ?
289 rsnd_runtime_channel_after_ctu(io) :
290 rsnd_runtime_channel_original(io)));
291 rsnd_mod_write(mod, mode_reg,
292 rsnd_get_busif_shift(io, mod) | 1);
293 rsnd_mod_write(mod, dalign_reg,
294 rsnd_get_dalign(mod, io));
295 }
296
297 if (has_hdmi0 || has_hdmi1) {
298 enum rsnd_mod_type rsnd_ssi_array[] = {
299 RSND_MOD_SSIM1,
300 RSND_MOD_SSIM2,
301 RSND_MOD_SSIM3,
302 };
303 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
304 struct rsnd_mod *pos;
305 u32 val;
306 int i;
307
308 i = rsnd_mod_id(ssi_mod);
309
310 /* output all same SSI as default */
311 val = i << 16 |
312 i << 20 |
313 i << 24 |
314 i << 28 |
315 i;
316
317 for_each_rsnd_mod_array(i, pos, io, rsnd_ssi_array) {
318 int shift = (i * 4) + 20;
319
320 val = (val & ~(0xF << shift)) |
321 rsnd_mod_id(pos) << shift;
322 }
323
324 if (has_hdmi0)
325 rsnd_mod_write(mod, HDMI0_SEL, val);
326 if (has_hdmi1)
327 rsnd_mod_write(mod, HDMI1_SEL, val);
328 }
329
330 return 0;
331 }
332
rsnd_ssiu_start_gen2(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)333 static int rsnd_ssiu_start_gen2(struct rsnd_mod *mod,
334 struct rsnd_dai_stream *io,
335 struct rsnd_priv *priv)
336 {
337 int busif = rsnd_mod_id_sub(mod);
338
339 if (!rsnd_ssi_use_busif(io))
340 return 0;
341
342 rsnd_mod_bset(mod, SSI_CTRL, 1 << (busif * 4), 1 << (busif * 4));
343
344 if (rsnd_ssi_multi_secondaries_runtime(io))
345 rsnd_mod_write(mod, SSI_CONTROL, 0x1);
346
347 return 0;
348 }
349
rsnd_ssiu_stop_gen2(struct rsnd_mod * mod,struct rsnd_dai_stream * io,struct rsnd_priv * priv)350 static int rsnd_ssiu_stop_gen2(struct rsnd_mod *mod,
351 struct rsnd_dai_stream *io,
352 struct rsnd_priv *priv)
353 {
354 struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
355 int busif = rsnd_mod_id_sub(mod);
356
357 if (!rsnd_ssi_use_busif(io))
358 return 0;
359
360 rsnd_mod_bset(mod, SSI_CTRL, 1 << (busif * 4), 0);
361
362 if (--ssiu->usrcnt)
363 return 0;
364
365 if (rsnd_ssi_multi_secondaries_runtime(io))
366 rsnd_mod_write(mod, SSI_CONTROL, 0);
367
368 return 0;
369 }
370
rsnd_ssiu_id(struct rsnd_mod * mod)371 static int rsnd_ssiu_id(struct rsnd_mod *mod)
372 {
373 struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
374
375 /* see rsnd_ssiu_probe() */
376 return ssiu->id;
377 }
378
rsnd_ssiu_id_sub(struct rsnd_mod * mod)379 static int rsnd_ssiu_id_sub(struct rsnd_mod *mod)
380 {
381 struct rsnd_ssiu *ssiu = rsnd_mod_to_ssiu(mod);
382
383 /* see rsnd_ssiu_probe() */
384 return ssiu->id_sub;
385 }
386
rsnd_ssiu_dma_req(struct rsnd_dai_stream * io,struct rsnd_mod * mod)387 static struct dma_chan *rsnd_ssiu_dma_req(struct rsnd_dai_stream *io,
388 struct rsnd_mod *mod)
389 {
390 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
391 int is_play = rsnd_io_is_play(io);
392 char *name;
393
394 /*
395 * It should use "rcar_sound,ssiu" on DT.
396 * But, we need to keep compatibility for old version.
397 *
398 * If it has "rcar_sound.ssiu", it will be used.
399 * If not, "rcar_sound.ssi" will be used.
400 * see
401 * rsnd_ssi_dma_req()
402 * rsnd_dma_of_path()
403 */
404
405 name = is_play ? "rx" : "tx";
406
407 return rsnd_dma_request_channel(rsnd_ssiu_of_node(priv),
408 SSIU_NAME, mod, name);
409 }
410
411 #ifdef CONFIG_DEBUG_FS
rsnd_ssiu_debug_info(struct seq_file * m,struct rsnd_dai_stream * io,struct rsnd_mod * mod)412 static void rsnd_ssiu_debug_info(struct seq_file *m,
413 struct rsnd_dai_stream *io,
414 struct rsnd_mod *mod)
415 {
416 rsnd_debugfs_mod_reg_show(m, mod, RSND_BASE_SSIU,
417 rsnd_mod_id(mod) * 0x80, 0x80);
418 }
419 #define DEBUG_INFO .debug_info = rsnd_ssiu_debug_info
420 #else
421 #define DEBUG_INFO
422 #endif
423
424 static struct rsnd_mod_ops rsnd_ssiu_ops_gen2 = {
425 .name = SSIU_NAME,
426 .dma_req = rsnd_ssiu_dma_req,
427 .init = rsnd_ssiu_init_gen2,
428 .quit = rsnd_ssiu_quit,
429 .start = rsnd_ssiu_start_gen2,
430 .stop = rsnd_ssiu_stop_gen2,
431 .get_status = rsnd_ssiu_get_status,
432 DEBUG_INFO
433 };
434
rsnd_ssiu_mod_get(struct rsnd_priv * priv,int id)435 static struct rsnd_mod *rsnd_ssiu_mod_get(struct rsnd_priv *priv, int id)
436 {
437 if (WARN_ON(id < 0 || id >= rsnd_ssiu_nr(priv)))
438 id = 0;
439
440 return rsnd_mod_get((struct rsnd_ssiu *)(priv->ssiu) + id);
441 }
442
rsnd_parse_connect_ssiu_compatible(struct rsnd_priv * priv,struct rsnd_dai_stream * io)443 static void rsnd_parse_connect_ssiu_compatible(struct rsnd_priv *priv,
444 struct rsnd_dai_stream *io)
445 {
446 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
447 struct rsnd_ssiu *ssiu;
448 int is_dma_mode;
449 int i;
450
451 if (!ssi_mod)
452 return;
453
454 is_dma_mode = rsnd_ssi_is_dma_mode(ssi_mod);
455
456 /* select BUSIF0 */
457 for_each_rsnd_ssiu(ssiu, priv, i) {
458 struct rsnd_mod *mod = rsnd_mod_get(ssiu);
459
460 if (is_dma_mode &&
461 (rsnd_mod_id(ssi_mod) == rsnd_mod_id(mod)) &&
462 (rsnd_mod_id_sub(mod) == 0)) {
463 rsnd_dai_connect(mod, io, mod->type);
464 return;
465 }
466 }
467 }
468
rsnd_parse_connect_ssiu(struct rsnd_dai * rdai,struct device_node * playback,struct device_node * capture)469 void rsnd_parse_connect_ssiu(struct rsnd_dai *rdai,
470 struct device_node *playback,
471 struct device_node *capture)
472 {
473 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
474 struct device *dev = rsnd_priv_to_dev(priv);
475 struct device_node *node = rsnd_ssiu_of_node(priv);
476 struct rsnd_dai_stream *io_p = &rdai->playback;
477 struct rsnd_dai_stream *io_c = &rdai->capture;
478
479 /* use rcar_sound,ssiu if exist */
480 if (node) {
481 struct device_node *np;
482 int i = 0;
483
484 for_each_child_of_node(node, np) {
485 struct rsnd_mod *mod;
486
487 i = rsnd_node_fixed_index(dev, np, SSIU_NAME, i);
488 if (i < 0) {
489 of_node_put(np);
490 break;
491 }
492
493 mod = rsnd_ssiu_mod_get(priv, i);
494
495 if (np == playback)
496 rsnd_dai_connect(mod, io_p, mod->type);
497 if (np == capture)
498 rsnd_dai_connect(mod, io_c, mod->type);
499 i++;
500 }
501
502 of_node_put(node);
503 }
504
505 /* Keep DT compatibility */
506 if (!rsnd_io_to_mod_ssiu(io_p))
507 rsnd_parse_connect_ssiu_compatible(priv, io_p);
508 if (!rsnd_io_to_mod_ssiu(io_c))
509 rsnd_parse_connect_ssiu_compatible(priv, io_c);
510 }
511
rsnd_ssiu_probe(struct rsnd_priv * priv)512 int rsnd_ssiu_probe(struct rsnd_priv *priv)
513 {
514 struct device *dev = rsnd_priv_to_dev(priv);
515 struct device_node *node;
516 struct rsnd_ssiu *ssiu;
517 struct rsnd_mod_ops *ops;
518 const int *list = NULL;
519 int i, nr;
520
521 /*
522 * Keep DT compatibility.
523 * if it has "rcar_sound,ssiu", use it.
524 * if not, use "rcar_sound,ssi"
525 * see
526 * rsnd_ssiu_bufsif_to_id()
527 */
528 node = rsnd_ssiu_of_node(priv);
529 if (node)
530 nr = rsnd_node_count(priv, node, SSIU_NAME);
531 else
532 nr = priv->ssi_nr;
533
534 if (!nr)
535 return -EINVAL;
536
537 ssiu = devm_kcalloc(dev, nr, sizeof(*ssiu), GFP_KERNEL);
538 if (!ssiu)
539 return -ENOMEM;
540
541 priv->ssiu = ssiu;
542 priv->ssiu_nr = nr;
543
544 if (rsnd_is_gen1(priv))
545 ops = &rsnd_ssiu_ops_gen1;
546 else
547 ops = &rsnd_ssiu_ops_gen2;
548
549 /* Keep compatibility */
550 nr = 0;
551 if ((node) &&
552 (ops == &rsnd_ssiu_ops_gen2)) {
553 ops->id = rsnd_ssiu_id;
554 ops->id_sub = rsnd_ssiu_id_sub;
555
556 if (rsnd_is_gen2(priv)) {
557 list = gen2_id;
558 nr = ARRAY_SIZE(gen2_id);
559 } else if (rsnd_is_gen3(priv)) {
560 list = gen3_id;
561 nr = ARRAY_SIZE(gen3_id);
562 } else if (rsnd_is_gen4(priv)) {
563 list = gen4_id;
564 nr = ARRAY_SIZE(gen4_id);
565 } else {
566 dev_err(dev, "unknown SSIU\n");
567 return -ENODEV;
568 }
569 }
570
571 for_each_rsnd_ssiu(ssiu, priv, i) {
572 int ret;
573
574 if (node) {
575 int j;
576
577 /*
578 * see
579 * rsnd_ssiu_get_id()
580 * rsnd_ssiu_get_id_sub()
581 */
582 for (j = 0; j < nr; j++) {
583 if (list[j] > i)
584 break;
585 ssiu->id = j;
586 ssiu->id_sub = i - list[ssiu->id];
587 }
588 } else {
589 ssiu->id = i;
590 }
591
592 ret = rsnd_mod_init(priv, rsnd_mod_get(ssiu),
593 ops, NULL, RSND_MOD_SSIU, i);
594 if (ret)
595 return ret;
596 }
597
598 return 0;
599 }
600
rsnd_ssiu_remove(struct rsnd_priv * priv)601 void rsnd_ssiu_remove(struct rsnd_priv *priv)
602 {
603 struct rsnd_ssiu *ssiu;
604 int i;
605
606 for_each_rsnd_ssiu(ssiu, priv, i) {
607 rsnd_mod_quit(rsnd_mod_get(ssiu));
608 }
609 }
610