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 void rsnd_dmapp_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
366 struct rsnd_mod *mod = rsnd_mod_get(dma);
367 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
368 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
369 volatile void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
370 u32 val = ioread32(addr);
373 val |= (data & mask);
375 iowrite32(val, addr);
378 static int rsnd_dmapp_stop(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);
385 rsnd_dmapp_bset(dma, 0, PDMACHCR_DE, PDMACHCR);
387 for (i = 0; i < 1024; i++) {
388 if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
396 static int rsnd_dmapp_start(struct rsnd_mod *mod,
397 struct rsnd_dai_stream *io,
398 struct rsnd_priv *priv)
400 struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
401 struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
403 rsnd_dmapp_write(dma, dma->src_addr, PDMASAR);
404 rsnd_dmapp_write(dma, dma->dst_addr, PDMADAR);
405 rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);
410 static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
411 struct rsnd_dma *dma, int id,
412 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
414 struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
415 struct rsnd_priv *priv = rsnd_io_to_priv(io);
416 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
417 struct device *dev = rsnd_priv_to_dev(priv);
419 dmapp->dmapp_id = dmac->dmapp_num;
420 dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
424 dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
425 dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
430 static struct rsnd_mod_ops rsnd_dmapp_ops = {
432 .start = rsnd_dmapp_start,
433 .stop = rsnd_dmapp_stop,
434 .quit = rsnd_dmapp_stop,
438 * Common DMAC Interface
442 * DMA read/write register offset
444 * RSND_xxx_I_N for Audio DMAC input
445 * RSND_xxx_O_N for Audio DMAC output
446 * RSND_xxx_I_P for Audio DMAC peri peri input
447 * RSND_xxx_O_P for Audio DMAC peri peri output
450 * mod / DMAC in / DMAC out / DMAC PP in / DMAC pp out
451 * SSI : 0xec541000 / 0xec241008 / 0xec24100c
452 * SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
453 * SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
454 * CMD : 0xec500000 / / 0xec008000 0xec308000
456 #define RDMA_SSI_I_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
457 #define RDMA_SSI_O_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
459 #define RDMA_SSIU_I_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
460 #define RDMA_SSIU_O_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
462 #define RDMA_SSIU_I_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
463 #define RDMA_SSIU_O_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
465 #define RDMA_SRC_I_N(addr, i) (addr ##_reg - 0x00500000 + (0x400 * i))
466 #define RDMA_SRC_O_N(addr, i) (addr ##_reg - 0x004fc000 + (0x400 * i))
468 #define RDMA_SRC_I_P(addr, i) (addr ##_reg - 0x00200000 + (0x400 * i))
469 #define RDMA_SRC_O_P(addr, i) (addr ##_reg - 0x001fc000 + (0x400 * i))
471 #define RDMA_CMD_O_N(addr, i) (addr ##_reg - 0x004f8000 + (0x400 * i))
472 #define RDMA_CMD_O_P(addr, i) (addr ##_reg - 0x001f8000 + (0x400 * i))
475 rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
476 struct rsnd_mod *mod,
477 int is_play, int is_from)
479 struct rsnd_priv *priv = rsnd_io_to_priv(io);
480 struct device *dev = rsnd_priv_to_dev(priv);
481 phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
482 phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
483 int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
484 int use_src = !!rsnd_io_to_mod_src(io);
485 int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
486 !!rsnd_io_to_mod_mix(io) ||
487 !!rsnd_io_to_mod_ctu(io);
488 int id = rsnd_mod_id(mod);
492 } dma_addrs[3][2][3] = {
496 { RDMA_SRC_O_N(src, id), RDMA_SRC_I_P(src, id) },
497 { RDMA_CMD_O_N(src, id), RDMA_SRC_I_P(src, id) } },
500 { RDMA_SRC_O_P(src, id), RDMA_SRC_I_N(src, id) },
501 { RDMA_CMD_O_P(src, id), RDMA_SRC_I_N(src, id) } }
505 {{{ RDMA_SSI_O_N(ssi, id), 0 },
506 { RDMA_SSIU_O_P(ssi, id), 0 },
507 { RDMA_SSIU_O_P(ssi, id), 0 } },
509 {{ 0, RDMA_SSI_I_N(ssi, id) },
510 { 0, RDMA_SSIU_I_P(ssi, id) },
511 { 0, RDMA_SSIU_I_P(ssi, id) } }
515 {{{ RDMA_SSIU_O_N(ssi, id), 0 },
516 { RDMA_SSIU_O_P(ssi, id), 0 },
517 { RDMA_SSIU_O_P(ssi, id), 0 } },
519 {{ 0, RDMA_SSIU_I_N(ssi, id) },
520 { 0, RDMA_SSIU_I_P(ssi, id) },
521 { 0, RDMA_SSIU_I_P(ssi, id) } } },
524 /* it shouldn't happen */
525 if (use_cmd && !use_src)
526 dev_err(dev, "DVC is selected without SRC\n");
528 /* use SSIU or SSI ? */
529 if (is_ssi && rsnd_ssi_use_busif(io))
533 dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
534 dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
537 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
538 struct rsnd_mod *mod,
539 int is_play, int is_from)
541 struct rsnd_priv *priv = rsnd_io_to_priv(io);
544 * gen1 uses default DMA addr
546 if (rsnd_is_gen1(priv))
552 return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
555 #define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
556 static void rsnd_dma_of_path(struct rsnd_mod *this,
557 struct rsnd_dai_stream *io,
559 struct rsnd_mod **mod_from,
560 struct rsnd_mod **mod_to)
562 struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
563 struct rsnd_mod *src = rsnd_io_to_mod_src(io);
564 struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
565 struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
566 struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
567 struct rsnd_mod *mod[MOD_MAX];
568 struct rsnd_mod *mod_start, *mod_end;
569 struct rsnd_priv *priv = rsnd_mod_to_priv(this);
570 struct device *dev = rsnd_priv_to_dev(priv);
577 for (i = 0; i < MOD_MAX; i++) {
579 nr += !!rsnd_io_to_mod(io, i);
584 * [S] -*-> SRC -o-> [E]
585 * [S] -*-> SRC -> DVC -o-> [E]
586 * [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
595 * -o-> Audio DMAC peri peri
597 mod_start = (is_play) ? NULL : ssi;
598 mod_end = (is_play) ? ssi : NULL;
601 mod[idx++] = mod_start;
602 for (i = 1; i < nr; i++) {
621 * -------------+-----+-----+
625 if ((this == ssi) == (is_play)) {
626 *mod_from = mod[idx - 1];
633 dev_dbg(dev, "module connection (this is %s[%d])\n",
634 rsnd_mod_name(this), rsnd_mod_id(this));
635 for (i = 0; i <= idx; i++) {
636 dev_dbg(dev, " %s[%d]%s\n",
637 rsnd_mod_name(mod[i]), rsnd_mod_id(mod[i]),
638 (mod[i] == *mod_from) ? " from" :
639 (mod[i] == *mod_to) ? " to" : "");
643 int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
644 struct rsnd_mod **dma_mod, int id)
646 struct rsnd_mod *mod_from = NULL;
647 struct rsnd_mod *mod_to = NULL;
648 struct rsnd_priv *priv = rsnd_io_to_priv(io);
649 struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
650 struct device *dev = rsnd_priv_to_dev(priv);
651 struct rsnd_mod_ops *ops;
652 enum rsnd_mod_type type;
653 int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma, int id,
654 struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
655 int is_play = rsnd_io_is_play(io);
659 * DMA failed. try to PIO mode
661 * rsnd_ssi_fallback()
662 * rsnd_rdai_continuance_probe()
667 rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
670 if (mod_from && mod_to) {
671 ops = &rsnd_dmapp_ops;
672 attach = rsnd_dmapp_attach;
673 dma_id = dmac->dmapp_num;
674 type = RSND_MOD_AUDMAPP;
676 ops = &rsnd_dmaen_ops;
677 attach = rsnd_dmaen_attach;
678 dma_id = dmac->dmaen_num;
679 type = RSND_MOD_AUDMA;
682 /* for Gen1, overwrite */
683 if (rsnd_is_gen1(priv)) {
684 ops = &rsnd_dmaen_ops;
685 attach = rsnd_dmaen_attach;
686 dma_id = dmac->dmaen_num;
687 type = RSND_MOD_AUDMA;
691 struct rsnd_dma *dma;
693 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
697 *dma_mod = rsnd_mod_get(dma);
699 dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
700 dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0);
702 ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
703 rsnd_mod_get_status, type, dma_id);
707 dev_dbg(dev, "%s[%d] %s[%d] -> %s[%d]\n",
708 rsnd_mod_name(*dma_mod), rsnd_mod_id(*dma_mod),
709 rsnd_mod_name(mod_from), rsnd_mod_id(mod_from),
710 rsnd_mod_name(mod_to), rsnd_mod_id(mod_to));
712 ret = attach(io, dma, id, mod_from, mod_to);
717 ret = rsnd_dai_connect(*dma_mod, io, type);
724 int rsnd_dma_probe(struct rsnd_priv *priv)
726 struct platform_device *pdev = rsnd_priv_to_pdev(priv);
727 struct device *dev = rsnd_priv_to_dev(priv);
728 struct rsnd_dma_ctrl *dmac;
729 struct resource *res;
734 if (rsnd_is_gen1(priv))
740 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
741 dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
743 dev_err(dev, "dma allocate failed\n");
744 return 0; /* it will be PIO mode */
748 dmac->base = devm_ioremap_resource(dev, res);
749 if (IS_ERR(dmac->base))
750 return PTR_ERR(dmac->base);