2 * Renesas R-Car Audio DMAC support
4 * Copyright (C) 2015 Renesas Electronics Corp.
5 * Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/delay.h>
12 #include <linux/of_dma.h>
16 * Audio DMAC peri peri register
23 #define PDMACHCR_DE (1 << 0)
27 struct dma_chan *chan;
45 struct rsnd_dma_ctrl {
51 #define rsnd_priv_to_dmac(p) ((struct rsnd_dma_ctrl *)(p)->dma)
52 #define rsnd_mod_to_dma(_mod) container_of((_mod), struct rsnd_dma, mod)
53 #define rsnd_dma_to_dmaen(dma) (&(dma)->dma.en)
54 #define rsnd_dma_to_dmapp(dma) (&(dma)->dma.pp)
59 static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
60 struct rsnd_dai_stream *io)
62 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
67 * Renesas sound Gen1 needs 1 DMAC,
69 * In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
70 * But, Audio-DMAC-peri-peri doesn't have interrupt,
71 * and this driver is assuming that here.
73 * If Audio-DMAC-peri-peri has interrpt,
74 * rsnd_dai_pointer_update() will be called twice,
75 * ant it will breaks io->byte_pos
77 spin_lock_irqsave(&priv->lock, flags);
79 if (rsnd_io_is_working(io))
80 elapsed = rsnd_dai_pointer_update(io, io->byte_per_period);
82 spin_unlock_irqrestore(&priv->lock, flags);
85 rsnd_dai_period_elapsed(io);
88 static void rsnd_dmaen_complete(void *data)
90 struct rsnd_mod *mod = data;
92 rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
95 static int rsnd_dmaen_stop(struct rsnd_mod *mod,
96 struct rsnd_dai_stream *io,
97 struct rsnd_priv *priv)
99 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
100 struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
102 dmaengine_terminate_all(dmaen->chan);
107 static int rsnd_dmaen_start(struct rsnd_mod *mod,
108 struct rsnd_dai_stream *io,
109 struct rsnd_priv *priv)
111 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
112 struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
113 struct snd_pcm_substream *substream = io->substream;
114 struct device *dev = rsnd_priv_to_dev(priv);
115 struct dma_async_tx_descriptor *desc;
116 int is_play = rsnd_io_is_play(io);
118 desc = dmaengine_prep_dma_cyclic(dmaen->chan,
119 substream->runtime->dma_addr,
120 snd_pcm_lib_buffer_bytes(substream),
121 snd_pcm_lib_period_bytes(substream),
122 is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
123 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
126 dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
130 desc->callback = rsnd_dmaen_complete;
131 desc->callback_param = rsnd_mod_get(dma);
133 if (dmaengine_submit(desc) < 0) {
134 dev_err(dev, "dmaengine_submit() fail\n");
138 dma_async_issue_pending(dmaen->chan);
143 struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
144 struct rsnd_mod *mod, char *name)
146 struct dma_chan *chan;
147 struct device_node *np;
150 for_each_child_of_node(of_node, np) {
151 if (i == rsnd_mod_id(mod))
156 chan = of_dma_request_slave_channel(np, name);
159 of_node_put(of_node);
164 static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
165 struct rsnd_mod *mod_from,
166 struct rsnd_mod *mod_to)
168 if ((!mod_from && !mod_to) ||
169 (mod_from && mod_to))
173 return rsnd_mod_dma_req(io, mod_from);
175 return rsnd_mod_dma_req(io, mod_to);
178 static int rsnd_dmaen_remove(struct rsnd_mod *mod,
179 struct rsnd_dai_stream *io,
180 struct rsnd_priv *priv)
182 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
183 struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
186 dma_release_channel(dmaen->chan);
193 static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
194 struct rsnd_dma *dma, int id,
195 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
197 struct rsnd_mod *mod = rsnd_mod_get(dma);
198 struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
199 struct rsnd_priv *priv = rsnd_io_to_priv(io);
200 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
201 struct device *dev = rsnd_priv_to_dev(priv);
202 struct dma_slave_config cfg = {};
203 int is_play = rsnd_io_is_play(io);
207 dev_err(dev, "it already has dma channel\n");
212 dmaen->chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
217 dma_cap_set(DMA_SLAVE, mask);
219 dmaen->chan = dma_request_channel(mask, shdma_chan_filter,
220 (void *)(uintptr_t)id);
222 if (IS_ERR_OR_NULL(dmaen->chan)) {
224 dev_err(dev, "can't get dma channel\n");
225 goto rsnd_dma_channel_err;
228 cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
229 cfg.src_addr = dma->src_addr;
230 cfg.dst_addr = dma->dst_addr;
231 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
232 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
234 dev_dbg(dev, "%s[%d] %pad -> %pad\n",
235 rsnd_mod_name(mod), rsnd_mod_id(mod),
236 &cfg.src_addr, &cfg.dst_addr);
238 ret = dmaengine_slave_config(dmaen->chan, &cfg);
240 goto rsnd_dma_attach_err;
247 rsnd_dmaen_remove(mod, io, priv);
248 rsnd_dma_channel_err:
251 * DMA failed. try to PIO mode
253 * rsnd_ssi_fallback()
254 * rsnd_rdai_continuance_probe()
259 static struct rsnd_mod_ops rsnd_dmaen_ops = {
261 .start = rsnd_dmaen_start,
262 .stop = rsnd_dmaen_stop,
263 .remove = rsnd_dmaen_remove,
267 * Audio DMAC peri peri
269 static const u8 gen2_id_table_ssiu[] = {
281 static const u8 gen2_id_table_scu[] = {
282 0x2d, /* SCU_SRCI0 */
283 0x2e, /* SCU_SRCI1 */
284 0x2f, /* SCU_SRCI2 */
285 0x30, /* SCU_SRCI3 */
286 0x31, /* SCU_SRCI4 */
287 0x32, /* SCU_SRCI5 */
288 0x33, /* SCU_SRCI6 */
289 0x34, /* SCU_SRCI7 */
290 0x35, /* SCU_SRCI8 */
291 0x36, /* SCU_SRCI9 */
293 static const u8 gen2_id_table_cmd[] = {
298 static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
299 struct rsnd_mod *mod)
301 struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
302 struct rsnd_mod *src = rsnd_io_to_mod_src(io);
303 struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
304 const u8 *entry = NULL;
305 int id = rsnd_mod_id(mod);
309 entry = gen2_id_table_ssiu;
310 size = ARRAY_SIZE(gen2_id_table_ssiu);
311 } else if (mod == src) {
312 entry = gen2_id_table_scu;
313 size = ARRAY_SIZE(gen2_id_table_scu);
314 } else if (mod == dvc) {
315 entry = gen2_id_table_cmd;
316 size = ARRAY_SIZE(gen2_id_table_cmd);
328 static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
329 struct rsnd_mod *mod_from,
330 struct rsnd_mod *mod_to)
332 return (rsnd_dmapp_get_id(io, mod_from) << 24) +
333 (rsnd_dmapp_get_id(io, mod_to) << 16);
336 #define rsnd_dmapp_addr(dmac, dma, reg) \
337 (dmac->base + 0x20 + reg + \
338 (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
339 static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
341 struct rsnd_mod *mod = rsnd_mod_get(dma);
342 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
343 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
344 struct device *dev = rsnd_priv_to_dev(priv);
346 dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
348 iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
351 static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
353 struct rsnd_mod *mod = rsnd_mod_get(dma);
354 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
355 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
357 return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
360 static int rsnd_dmapp_stop(struct rsnd_mod *mod,
361 struct rsnd_dai_stream *io,
362 struct rsnd_priv *priv)
364 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
367 rsnd_dmapp_write(dma, 0, PDMACHCR);
369 for (i = 0; i < 1024; i++) {
370 if (0 == rsnd_dmapp_read(dma, PDMACHCR))
378 static int rsnd_dmapp_start(struct rsnd_mod *mod,
379 struct rsnd_dai_stream *io,
380 struct rsnd_priv *priv)
382 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
383 struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
385 rsnd_dmapp_write(dma, dma->src_addr, PDMASAR);
386 rsnd_dmapp_write(dma, dma->dst_addr, PDMADAR);
387 rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);
392 static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
393 struct rsnd_dma *dma, int id,
394 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
396 struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
397 struct rsnd_priv *priv = rsnd_io_to_priv(io);
398 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
399 struct device *dev = rsnd_priv_to_dev(priv);
401 dmapp->dmapp_id = dmac->dmapp_num;
402 dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
406 dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
407 dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
412 static struct rsnd_mod_ops rsnd_dmapp_ops = {
414 .start = rsnd_dmapp_start,
415 .stop = rsnd_dmapp_stop,
416 .quit = rsnd_dmapp_stop,
420 * Common DMAC Interface
424 * DMA read/write register offset
426 * RSND_xxx_I_N for Audio DMAC input
427 * RSND_xxx_O_N for Audio DMAC output
428 * RSND_xxx_I_P for Audio DMAC peri peri input
429 * RSND_xxx_O_P for Audio DMAC peri peri output
432 * mod / DMAC in / DMAC out / DMAC PP in / DMAC pp out
433 * SSI : 0xec541000 / 0xec241008 / 0xec24100c
434 * SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
435 * SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
436 * CMD : 0xec500000 / / 0xec008000 0xec308000
438 #define RDMA_SSI_I_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
439 #define RDMA_SSI_O_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
441 #define RDMA_SSIU_I_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
442 #define RDMA_SSIU_O_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
444 #define RDMA_SSIU_I_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
445 #define RDMA_SSIU_O_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
447 #define RDMA_SRC_I_N(addr, i) (addr ##_reg - 0x00500000 + (0x400 * i))
448 #define RDMA_SRC_O_N(addr, i) (addr ##_reg - 0x004fc000 + (0x400 * i))
450 #define RDMA_SRC_I_P(addr, i) (addr ##_reg - 0x00200000 + (0x400 * i))
451 #define RDMA_SRC_O_P(addr, i) (addr ##_reg - 0x001fc000 + (0x400 * i))
453 #define RDMA_CMD_O_N(addr, i) (addr ##_reg - 0x004f8000 + (0x400 * i))
454 #define RDMA_CMD_O_P(addr, i) (addr ##_reg - 0x001f8000 + (0x400 * i))
457 rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
458 struct rsnd_mod *mod,
459 int is_play, int is_from)
461 struct rsnd_priv *priv = rsnd_io_to_priv(io);
462 struct device *dev = rsnd_priv_to_dev(priv);
463 phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
464 phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
465 int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
466 int use_src = !!rsnd_io_to_mod_src(io);
467 int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
468 !!rsnd_io_to_mod_mix(io) ||
469 !!rsnd_io_to_mod_ctu(io);
470 int id = rsnd_mod_id(mod);
474 } dma_addrs[3][2][3] = {
478 { RDMA_SRC_O_N(src, id), RDMA_SRC_I_P(src, id) },
479 { RDMA_CMD_O_N(src, id), RDMA_SRC_I_P(src, id) } },
482 { RDMA_SRC_O_P(src, id), RDMA_SRC_I_N(src, id) },
483 { RDMA_CMD_O_P(src, id), RDMA_SRC_I_N(src, id) } }
487 {{{ RDMA_SSI_O_N(ssi, id), 0 },
488 { RDMA_SSIU_O_P(ssi, id), 0 },
489 { RDMA_SSIU_O_P(ssi, id), 0 } },
491 {{ 0, RDMA_SSI_I_N(ssi, id) },
492 { 0, RDMA_SSIU_I_P(ssi, id) },
493 { 0, RDMA_SSIU_I_P(ssi, id) } }
497 {{{ RDMA_SSIU_O_N(ssi, id), 0 },
498 { RDMA_SSIU_O_P(ssi, id), 0 },
499 { RDMA_SSIU_O_P(ssi, id), 0 } },
501 {{ 0, RDMA_SSIU_I_N(ssi, id) },
502 { 0, RDMA_SSIU_I_P(ssi, id) },
503 { 0, RDMA_SSIU_I_P(ssi, id) } } },
506 /* it shouldn't happen */
507 if (use_cmd && !use_src)
508 dev_err(dev, "DVC is selected without SRC\n");
510 /* use SSIU or SSI ? */
511 if (is_ssi && rsnd_ssi_use_busif(io))
515 dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
516 dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
519 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
520 struct rsnd_mod *mod,
521 int is_play, int is_from)
523 struct rsnd_priv *priv = rsnd_io_to_priv(io);
526 * gen1 uses default DMA addr
528 if (rsnd_is_gen1(priv))
534 return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
537 #define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
538 static void rsnd_dma_of_path(struct rsnd_mod *this,
539 struct rsnd_dai_stream *io,
541 struct rsnd_mod **mod_from,
542 struct rsnd_mod **mod_to)
544 struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
545 struct rsnd_mod *src = rsnd_io_to_mod_src(io);
546 struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
547 struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
548 struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
549 struct rsnd_mod *mod[MOD_MAX];
550 struct rsnd_mod *mod_start, *mod_end;
551 struct rsnd_priv *priv = rsnd_mod_to_priv(this);
552 struct device *dev = rsnd_priv_to_dev(priv);
559 for (i = 0; i < MOD_MAX; i++) {
561 nr += !!rsnd_io_to_mod(io, i);
566 * [S] -*-> SRC -o-> [E]
567 * [S] -*-> SRC -> DVC -o-> [E]
568 * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
577 * -o-> Audio DMAC peri peri
579 mod_start = (is_play) ? NULL : ssi;
580 mod_end = (is_play) ? ssi : NULL;
583 mod[idx++] = mod_start;
584 for (i = 1; i < nr; i++) {
603 * -------------+-----+-----+
607 if ((this == ssi) == (is_play)) {
608 *mod_from = mod[idx - 1];
615 dev_dbg(dev, "module connection (this is %s[%d])\n",
616 rsnd_mod_name(this), rsnd_mod_id(this));
617 for (i = 0; i <= idx; i++) {
618 dev_dbg(dev, " %s[%d]%s\n",
619 rsnd_mod_name(mod[i]), rsnd_mod_id(mod[i]),
620 (mod[i] == *mod_from) ? " from" :
621 (mod[i] == *mod_to) ? " to" : "");
625 struct rsnd_mod *rsnd_dma_attach(struct rsnd_dai_stream *io,
626 struct rsnd_mod *mod, int id)
628 struct rsnd_mod *dma_mod;
629 struct rsnd_mod *mod_from = NULL;
630 struct rsnd_mod *mod_to = NULL;
631 struct rsnd_priv *priv = rsnd_io_to_priv(io);
632 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
633 struct rsnd_dma *dma;
634 struct device *dev = rsnd_priv_to_dev(priv);
635 struct rsnd_mod_ops *ops;
636 enum rsnd_mod_type type;
637 int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma, int id,
638 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
639 int is_play = rsnd_io_is_play(io);
643 * DMA failed. try to PIO mode
645 * rsnd_ssi_fallback()
646 * rsnd_rdai_continuance_probe()
649 return ERR_PTR(-EAGAIN);
651 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
653 return ERR_PTR(-ENOMEM);
655 rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
657 dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
658 dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0);
661 if (mod_from && mod_to) {
662 ops = &rsnd_dmapp_ops;
663 attach = rsnd_dmapp_attach;
664 dma_id = dmac->dmapp_num;
665 type = RSND_MOD_AUDMAPP;
667 ops = &rsnd_dmaen_ops;
668 attach = rsnd_dmaen_attach;
669 dma_id = dmac->dmaen_num;
670 type = RSND_MOD_AUDMA;
673 /* for Gen1, overwrite */
674 if (rsnd_is_gen1(priv)) {
675 ops = &rsnd_dmaen_ops;
676 attach = rsnd_dmaen_attach;
677 dma_id = dmac->dmaen_num;
678 type = RSND_MOD_AUDMA;
681 dma_mod = rsnd_mod_get(dma);
683 ret = rsnd_mod_init(priv, dma_mod,
684 ops, NULL, type, dma_id);
688 dev_dbg(dev, "%s[%d] %s[%d] -> %s[%d]\n",
689 rsnd_mod_name(dma_mod), rsnd_mod_id(dma_mod),
690 rsnd_mod_name(mod_from), rsnd_mod_id(mod_from),
691 rsnd_mod_name(mod_to), rsnd_mod_id(mod_to));
693 ret = attach(io, dma, id, mod_from, mod_to);
697 ret = rsnd_dai_connect(dma_mod, io, type);
701 return rsnd_mod_get(dma);
704 int rsnd_dma_probe(struct rsnd_priv *priv)
706 struct platform_device *pdev = rsnd_priv_to_pdev(priv);
707 struct device *dev = rsnd_priv_to_dev(priv);
708 struct rsnd_dma_ctrl *dmac;
709 struct resource *res;
714 if (rsnd_is_gen1(priv))
720 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
721 dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
723 dev_err(dev, "dma allocate failed\n");
724 return 0; /* it will be PIO mode */
728 dmac->base = devm_ioremap_resource(dev, res);
729 if (IS_ERR(dmac->base))
730 return PTR_ERR(dmac->base);