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);
319 if ((!entry) || (size <= id)) {
320 struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
322 dev_err(dev, "unknown connection (%s[%d])\n",
323 rsnd_mod_name(mod), rsnd_mod_id(mod));
325 /* use non-prohibited SRS number as error */
326 return 0x00; /* SSI00 */
332 static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
333 struct rsnd_mod *mod_from,
334 struct rsnd_mod *mod_to)
336 return (rsnd_dmapp_get_id(io, mod_from) << 24) +
337 (rsnd_dmapp_get_id(io, mod_to) << 16);
340 #define rsnd_dmapp_addr(dmac, dma, reg) \
341 (dmac->base + 0x20 + reg + \
342 (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
343 static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
345 struct rsnd_mod *mod = rsnd_mod_get(dma);
346 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
347 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
348 struct device *dev = rsnd_priv_to_dev(priv);
350 dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
352 iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
355 static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
357 struct rsnd_mod *mod = rsnd_mod_get(dma);
358 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
359 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
361 return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
364 static int rsnd_dmapp_stop(struct rsnd_mod *mod,
365 struct rsnd_dai_stream *io,
366 struct rsnd_priv *priv)
368 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
371 rsnd_dmapp_write(dma, 0, PDMACHCR);
373 for (i = 0; i < 1024; i++) {
374 if (0 == rsnd_dmapp_read(dma, PDMACHCR))
382 static int rsnd_dmapp_start(struct rsnd_mod *mod,
383 struct rsnd_dai_stream *io,
384 struct rsnd_priv *priv)
386 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
387 struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
389 rsnd_dmapp_write(dma, dma->src_addr, PDMASAR);
390 rsnd_dmapp_write(dma, dma->dst_addr, PDMADAR);
391 rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);
396 static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
397 struct rsnd_dma *dma, int id,
398 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
400 struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
401 struct rsnd_priv *priv = rsnd_io_to_priv(io);
402 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
403 struct device *dev = rsnd_priv_to_dev(priv);
405 dmapp->dmapp_id = dmac->dmapp_num;
406 dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
410 dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
411 dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
416 static struct rsnd_mod_ops rsnd_dmapp_ops = {
418 .start = rsnd_dmapp_start,
419 .stop = rsnd_dmapp_stop,
420 .quit = rsnd_dmapp_stop,
424 * Common DMAC Interface
428 * DMA read/write register offset
430 * RSND_xxx_I_N for Audio DMAC input
431 * RSND_xxx_O_N for Audio DMAC output
432 * RSND_xxx_I_P for Audio DMAC peri peri input
433 * RSND_xxx_O_P for Audio DMAC peri peri output
436 * mod / DMAC in / DMAC out / DMAC PP in / DMAC pp out
437 * SSI : 0xec541000 / 0xec241008 / 0xec24100c
438 * SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
439 * SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
440 * CMD : 0xec500000 / / 0xec008000 0xec308000
442 #define RDMA_SSI_I_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
443 #define RDMA_SSI_O_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
445 #define RDMA_SSIU_I_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
446 #define RDMA_SSIU_O_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
448 #define RDMA_SSIU_I_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
449 #define RDMA_SSIU_O_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
451 #define RDMA_SRC_I_N(addr, i) (addr ##_reg - 0x00500000 + (0x400 * i))
452 #define RDMA_SRC_O_N(addr, i) (addr ##_reg - 0x004fc000 + (0x400 * i))
454 #define RDMA_SRC_I_P(addr, i) (addr ##_reg - 0x00200000 + (0x400 * i))
455 #define RDMA_SRC_O_P(addr, i) (addr ##_reg - 0x001fc000 + (0x400 * i))
457 #define RDMA_CMD_O_N(addr, i) (addr ##_reg - 0x004f8000 + (0x400 * i))
458 #define RDMA_CMD_O_P(addr, i) (addr ##_reg - 0x001f8000 + (0x400 * i))
461 rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
462 struct rsnd_mod *mod,
463 int is_play, int is_from)
465 struct rsnd_priv *priv = rsnd_io_to_priv(io);
466 struct device *dev = rsnd_priv_to_dev(priv);
467 phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
468 phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
469 int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
470 int use_src = !!rsnd_io_to_mod_src(io);
471 int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
472 !!rsnd_io_to_mod_mix(io) ||
473 !!rsnd_io_to_mod_ctu(io);
474 int id = rsnd_mod_id(mod);
478 } dma_addrs[3][2][3] = {
482 { RDMA_SRC_O_N(src, id), RDMA_SRC_I_P(src, id) },
483 { RDMA_CMD_O_N(src, id), RDMA_SRC_I_P(src, id) } },
486 { RDMA_SRC_O_P(src, id), RDMA_SRC_I_N(src, id) },
487 { RDMA_CMD_O_P(src, id), RDMA_SRC_I_N(src, id) } }
491 {{{ RDMA_SSI_O_N(ssi, id), 0 },
492 { RDMA_SSIU_O_P(ssi, id), 0 },
493 { RDMA_SSIU_O_P(ssi, id), 0 } },
495 {{ 0, RDMA_SSI_I_N(ssi, id) },
496 { 0, RDMA_SSIU_I_P(ssi, id) },
497 { 0, RDMA_SSIU_I_P(ssi, id) } }
501 {{{ RDMA_SSIU_O_N(ssi, id), 0 },
502 { RDMA_SSIU_O_P(ssi, id), 0 },
503 { RDMA_SSIU_O_P(ssi, id), 0 } },
505 {{ 0, RDMA_SSIU_I_N(ssi, id) },
506 { 0, RDMA_SSIU_I_P(ssi, id) },
507 { 0, RDMA_SSIU_I_P(ssi, id) } } },
510 /* it shouldn't happen */
511 if (use_cmd && !use_src)
512 dev_err(dev, "DVC is selected without SRC\n");
514 /* use SSIU or SSI ? */
515 if (is_ssi && rsnd_ssi_use_busif(io))
519 dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
520 dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
523 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
524 struct rsnd_mod *mod,
525 int is_play, int is_from)
527 struct rsnd_priv *priv = rsnd_io_to_priv(io);
530 * gen1 uses default DMA addr
532 if (rsnd_is_gen1(priv))
538 return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
541 #define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
542 static void rsnd_dma_of_path(struct rsnd_mod *this,
543 struct rsnd_dai_stream *io,
545 struct rsnd_mod **mod_from,
546 struct rsnd_mod **mod_to)
548 struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
549 struct rsnd_mod *src = rsnd_io_to_mod_src(io);
550 struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
551 struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
552 struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
553 struct rsnd_mod *mod[MOD_MAX];
554 struct rsnd_mod *mod_start, *mod_end;
555 struct rsnd_priv *priv = rsnd_mod_to_priv(this);
556 struct device *dev = rsnd_priv_to_dev(priv);
563 for (i = 0; i < MOD_MAX; i++) {
565 nr += !!rsnd_io_to_mod(io, i);
570 * [S] -*-> SRC -o-> [E]
571 * [S] -*-> SRC -> DVC -o-> [E]
572 * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
581 * -o-> Audio DMAC peri peri
583 mod_start = (is_play) ? NULL : ssi;
584 mod_end = (is_play) ? ssi : NULL;
587 mod[idx++] = mod_start;
588 for (i = 1; i < nr; i++) {
607 * -------------+-----+-----+
611 if ((this == ssi) == (is_play)) {
612 *mod_from = mod[idx - 1];
619 dev_dbg(dev, "module connection (this is %s[%d])\n",
620 rsnd_mod_name(this), rsnd_mod_id(this));
621 for (i = 0; i <= idx; i++) {
622 dev_dbg(dev, " %s[%d]%s\n",
623 rsnd_mod_name(mod[i]), rsnd_mod_id(mod[i]),
624 (mod[i] == *mod_from) ? " from" :
625 (mod[i] == *mod_to) ? " to" : "");
629 int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
630 struct rsnd_mod **dma_mod, int id)
632 struct rsnd_mod *mod_from = NULL;
633 struct rsnd_mod *mod_to = NULL;
634 struct rsnd_priv *priv = rsnd_io_to_priv(io);
635 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
636 struct device *dev = rsnd_priv_to_dev(priv);
637 struct rsnd_mod_ops *ops;
638 enum rsnd_mod_type type;
639 int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma, int id,
640 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
641 int is_play = rsnd_io_is_play(io);
645 * DMA failed. try to PIO mode
647 * rsnd_ssi_fallback()
648 * rsnd_rdai_continuance_probe()
653 rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
656 if (mod_from && mod_to) {
657 ops = &rsnd_dmapp_ops;
658 attach = rsnd_dmapp_attach;
659 dma_id = dmac->dmapp_num;
660 type = RSND_MOD_AUDMAPP;
662 ops = &rsnd_dmaen_ops;
663 attach = rsnd_dmaen_attach;
664 dma_id = dmac->dmaen_num;
665 type = RSND_MOD_AUDMA;
668 /* for Gen1, overwrite */
669 if (rsnd_is_gen1(priv)) {
670 ops = &rsnd_dmaen_ops;
671 attach = rsnd_dmaen_attach;
672 dma_id = dmac->dmaen_num;
673 type = RSND_MOD_AUDMA;
677 struct rsnd_dma *dma;
679 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
683 *dma_mod = rsnd_mod_get(dma);
685 dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
686 dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0);
688 ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
689 rsnd_mod_get_status, type, dma_id);
693 dev_dbg(dev, "%s[%d] %s[%d] -> %s[%d]\n",
694 rsnd_mod_name(*dma_mod), rsnd_mod_id(*dma_mod),
695 rsnd_mod_name(mod_from), rsnd_mod_id(mod_from),
696 rsnd_mod_name(mod_to), rsnd_mod_id(mod_to));
698 ret = attach(io, dma, id, mod_from, mod_to);
703 ret = rsnd_dai_connect(*dma_mod, io, type);
710 int rsnd_dma_probe(struct rsnd_priv *priv)
712 struct platform_device *pdev = rsnd_priv_to_pdev(priv);
713 struct device *dev = rsnd_priv_to_dev(priv);
714 struct rsnd_dma_ctrl *dmac;
715 struct resource *res;
720 if (rsnd_is_gen1(priv))
726 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
727 dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
729 dev_err(dev, "dma allocate failed\n");
730 return 0; /* it will be PIO mode */
734 dmac->base = devm_ioremap_resource(dev, res);
735 if (IS_ERR(dmac->base))
736 return PTR_ERR(dmac->base);