- 根目录:
- sound
- soc
- sh
- rcar
- dma.c
/*
* Renesas R-Car Audio DMAC support
*
* Copyright (C) 2015 Renesas Electronics Corp.
* Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/of_dma.h>
#include "rsnd.h"
/*
* Audio DMAC peri peri register
*/
#define PDMASAR 0x00
#define PDMADAR 0x04
#define PDMACHCR 0x0c
/* PDMACHCR */
#define PDMACHCR_DE (1 << 0)
struct rsnd_dma_ctrl {
void __iomem *base;
int dmapp_num;
};
struct rsnd_dma_ops {
char *name;
void (*start)(struct rsnd_dai_stream *io, struct rsnd_dma *dma);
void (*stop)(struct rsnd_dai_stream *io, struct rsnd_dma *dma);
int (*init)(struct rsnd_dai_stream *io, struct rsnd_dma *dma, int id,
struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
void (*quit)(struct rsnd_dai_stream *io, struct rsnd_dma *dma);
};
#define rsnd_priv_to_dmac(p) ((struct rsnd_dma_ctrl *)(p)->dma)
/*
* Audio DMAC
*/
static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
struct rsnd_dai_stream *io)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
bool elapsed = false;
unsigned long flags;
/*
* Renesas sound Gen1 needs 1 DMAC,
* Gen2 needs 2 DMAC.
* In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
* But, Audio-DMAC-peri-peri doesn't have interrupt,
* and this driver is assuming that here.
*
* If Audio-DMAC-peri-peri has interrpt,
* rsnd_dai_pointer_update() will be called twice,
* ant it will breaks io->byte_pos
*/
spin_lock_irqsave(&priv->lock, flags);
if (rsnd_io_is_working(io))
elapsed = rsnd_dai_pointer_update(io, io->byte_per_period);
spin_unlock_irqrestore(&priv->lock, flags);
if (elapsed)
rsnd_dai_period_elapsed(io);
}
static void rsnd_dmaen_complete(void *data)
{
struct rsnd_mod *mod = data;
rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
}
static void rsnd_dmaen_stop(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
dmaengine_terminate_all(dmaen->chan);
}
static void rsnd_dmaen_start(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct snd_pcm_substream *substream = io->substream;
struct device *dev = rsnd_priv_to_dev(priv);
struct dma_async_tx_descriptor *desc;
int is_play = rsnd_io_is_play(io);
desc = dmaengine_prep_dma_cyclic(dmaen->chan,
substream->runtime->dma_addr,
snd_pcm_lib_buffer_bytes(substream),
snd_pcm_lib_period_bytes(substream),
is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
return;
}
desc->callback = rsnd_dmaen_complete;
desc->callback_param = mod;
if (dmaengine_submit(desc) < 0) {
dev_err(dev, "dmaengine_submit() fail\n");
return;
}
dma_async_issue_pending(dmaen->chan);
}
struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
struct rsnd_mod *mod, char *name)
{
struct dma_chan *chan;
struct device_node *np;
int i = 0;
for_each_child_of_node(of_node, np) {
if (i == rsnd_mod_id(mod))
break;
i++;
}
chan = of_dma_request_slave_channel(np, name);
of_node_put(np);
of_node_put(of_node);
return chan;
}
static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
struct rsnd_mod *mod_from,
struct rsnd_mod *mod_to)
{
if ((!mod_from && !mod_to) ||
(mod_from && mod_to))
return NULL;
if (mod_from)
return rsnd_mod_dma_req(io, mod_from);
else
return rsnd_mod_dma_req(io, mod_to);
}
static int rsnd_dmaen_init(struct rsnd_dai_stream *io,
struct rsnd_dma *dma, int id,
struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
{
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
struct rsnd_priv *priv = rsnd_io_to_priv(io);
struct device *dev = rsnd_priv_to_dev(priv);
struct dma_slave_config cfg = {};
int is_play = rsnd_io_is_play(io);
int ret;
if (dmaen->chan) {
dev_err(dev, "it already has dma channel\n");
return -EIO;
}
if (dev->of_node) {
dmaen->chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
} else {
dma_cap_mask_t mask;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dmaen->chan = dma_request_channel(mask, shdma_chan_filter,
(void *)(uintptr_t)id);
}
if (IS_ERR_OR_NULL(dmaen->chan)) {
dmaen->chan = NULL;
dev_err(dev, "can't get dma channel\n");
goto rsnd_dma_channel_err;
}
cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
cfg.src_addr = dma->src_addr;
cfg.dst_addr = dma->dst_addr;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
dev_dbg(dev, "%s %pad -> %pad\n",
dma->ops->name,
&cfg.src_addr, &cfg.dst_addr);
ret = dmaengine_slave_config(dmaen->chan, &cfg);
if (ret < 0)
goto rsnd_dma_init_err;
return 0;
rsnd_dma_init_err:
rsnd_dma_quit(io, dma);
rsnd_dma_channel_err:
/*
* DMA failed. try to PIO mode
* see
* rsnd_ssi_fallback()
* rsnd_rdai_continuance_probe()
*/
return -EAGAIN;
}
static void rsnd_dmaen_quit(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
if (dmaen->chan)
dma_release_channel(dmaen->chan);
dmaen->chan = NULL;
}
static struct rsnd_dma_ops rsnd_dmaen_ops = {
.name = "audmac",
.start = rsnd_dmaen_start,
.stop = rsnd_dmaen_stop,
.init = rsnd_dmaen_init,
.quit = rsnd_dmaen_quit,
};
/*
* Audio DMAC peri peri
*/
static const u8 gen2_id_table_ssiu[] = {
0x00, /* SSI00 */
0x04, /* SSI10 */
0x08, /* SSI20 */
0x0c, /* SSI3 */
0x0d, /* SSI4 */
0x0e, /* SSI5 */
0x0f, /* SSI6 */
0x10, /* SSI7 */
0x11, /* SSI8 */
0x12, /* SSI90 */
};
static const u8 gen2_id_table_scu[] = {
0x2d, /* SCU_SRCI0 */
0x2e, /* SCU_SRCI1 */
0x2f, /* SCU_SRCI2 */
0x30, /* SCU_SRCI3 */
0x31, /* SCU_SRCI4 */
0x32, /* SCU_SRCI5 */
0x33, /* SCU_SRCI6 */
0x34, /* SCU_SRCI7 */
0x35, /* SCU_SRCI8 */
0x36, /* SCU_SRCI9 */
};
static const u8 gen2_id_table_cmd[] = {
0x37, /* SCU_CMD0 */
0x38, /* SCU_CMD1 */
};
static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
struct rsnd_mod *mod)
{
struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
struct rsnd_mod *src = rsnd_io_to_mod_src(io);
struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
const u8 *entry = NULL;
int id = rsnd_mod_id(mod);
int size = 0;
if (mod == ssi) {
entry = gen2_id_table_ssiu;
size = ARRAY_SIZE(gen2_id_table_ssiu);
} else if (mod == src) {
entry = gen2_id_table_scu;
size = ARRAY_SIZE(gen2_id_table_scu);
} else if (mod == dvc) {
entry = gen2_id_table_cmd;
size = ARRAY_SIZE(gen2_id_table_cmd);
}
if (!entry)
return 0xFF;
if (size <= id)
return 0xFF;
return entry[id];
}
static u32 rsnd_dmapp_get_chcr(struct rsnd_dai_stream *io,
struct rsnd_mod *mod_from,
struct rsnd_mod *mod_to)
{
return (rsnd_dmapp_get_id(io, mod_from) << 24) +
(rsnd_dmapp_get_id(io, mod_to) << 16);
}
#define rsnd_dmapp_addr(dmac, dma, reg) \
(dmac->base + 0x20 + reg + \
(0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
{
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
struct device *dev = rsnd_priv_to_dev(priv);
dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
}
static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
{
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
}
static void rsnd_dmapp_stop(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
int i;
rsnd_dmapp_write(dma, 0, PDMACHCR);
for (i = 0; i < 1024; i++) {
if (0 == rsnd_dmapp_read(dma, PDMACHCR))
return;
udelay(1);
}
}
static void rsnd_dmapp_start(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
rsnd_dmapp_write(dma, dma->src_addr, PDMASAR);
rsnd_dmapp_write(dma, dma->dst_addr, PDMADAR);
rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);
}
static int rsnd_dmapp_init(struct rsnd_dai_stream *io,
struct rsnd_dma *dma, int id,
struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
{
struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
struct rsnd_priv *priv = rsnd_io_to_priv(io);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
struct device *dev = rsnd_priv_to_dev(priv);
dmapp->dmapp_id = dmac->dmapp_num;
dmapp->chcr = rsnd_dmapp_get_chcr(io, mod_from, mod_to) | PDMACHCR_DE;
dmac->dmapp_num++;
rsnd_dmapp_stop(io, dma);
dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
return 0;
}
static struct rsnd_dma_ops rsnd_dmapp_ops = {
.name = "audmac-pp",
.start = rsnd_dmapp_start,
.stop = rsnd_dmapp_stop,
.init = rsnd_dmapp_init,
.quit = rsnd_dmapp_stop,
};
/*
* Common DMAC Interface
*/
/*
* DMA read/write register offset
*
* RSND_xxx_I_N for Audio DMAC input
* RSND_xxx_O_N for Audio DMAC output
* RSND_xxx_I_P for Audio DMAC peri peri input
* RSND_xxx_O_P for Audio DMAC peri peri output
*
* ex) R-Car H2 case
* mod / DMAC in / DMAC out / DMAC PP in / DMAC pp out
* SSI : 0xec541000 / 0xec241008 / 0xec24100c
* SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
* SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
* CMD : 0xec500000 / / 0xec008000 0xec308000
*/
#define RDMA_SSI_I_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
#define RDMA_SSI_O_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
#define RDMA_SSIU_I_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
#define RDMA_SSIU_O_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
#define RDMA_SSIU_I_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
#define RDMA_SSIU_O_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
#define RDMA_SRC_I_N(addr, i) (addr ##_reg - 0x00500000 + (0x400 * i))
#define RDMA_SRC_O_N(addr, i) (addr ##_reg - 0x004fc000 + (0x400 * i))
#define RDMA_SRC_I_P(addr, i) (addr ##_reg - 0x00200000 + (0x400 * i))
#define RDMA_SRC_O_P(addr, i) (addr ##_reg - 0x001fc000 + (0x400 * i))
#define RDMA_CMD_O_N(addr, i) (addr ##_reg - 0x004f8000 + (0x400 * i))
#define RDMA_CMD_O_P(addr, i) (addr ##_reg - 0x001f8000 + (0x400 * i))
static dma_addr_t
rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
struct rsnd_mod *mod,
int is_play, int is_from)
{
struct rsnd_priv *priv = rsnd_io_to_priv(io);
struct device *dev = rsnd_priv_to_dev(priv);
phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
int use_src = !!rsnd_io_to_mod_src(io);
int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
!!rsnd_io_to_mod_mix(io) ||
!!rsnd_io_to_mod_ctu(io);
int id = rsnd_mod_id(mod);
struct dma_addr {
dma_addr_t out_addr;
dma_addr_t in_addr;
} dma_addrs[3][2][3] = {
/* SRC */
{{{ 0, 0 },
/* Capture */
{ RDMA_SRC_O_N(src, id), RDMA_SRC_I_P(src, id) },
{ RDMA_CMD_O_N(src, id), RDMA_SRC_I_P(src, id) } },
/* Playback */
{{ 0, 0, },
{ RDMA_SRC_O_P(src, id), RDMA_SRC_I_N(src, id) },
{ RDMA_CMD_O_P(src, id), RDMA_SRC_I_N(src, id) } }
},
/* SSI */
/* Capture */
{{{ RDMA_SSI_O_N(ssi, id), 0 },
{ RDMA_SSIU_O_P(ssi, id), 0 },
{ RDMA_SSIU_O_P(ssi, id), 0 } },
/* Playback */
{{ 0, RDMA_SSI_I_N(ssi, id) },
{ 0, RDMA_SSIU_I_P(ssi, id) },
{ 0, RDMA_SSIU_I_P(ssi, id) } }
},
/* SSIU */
/* Capture */
{{{ RDMA_SSIU_O_N(ssi, id), 0 },
{ RDMA_SSIU_O_P(ssi, id), 0 },
{ RDMA_SSIU_O_P(ssi, id), 0 } },
/* Playback */
{{ 0, RDMA_SSIU_I_N(ssi, id) },
{ 0, RDMA_SSIU_I_P(ssi, id) },
{ 0, RDMA_SSIU_I_P(ssi, id) } } },
};
/* it shouldn't happen */
if (use_cmd && !use_src)
dev_err(dev, "DVC is selected without SRC\n");
/* use SSIU or SSI ? */
if (is_ssi && rsnd_ssi_use_busif(io))
is_ssi++;
return (is_from) ?
dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
}
static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
struct rsnd_mod *mod,
int is_play, int is_from)
{
struct rsnd_priv *priv = rsnd_io_to_priv(io);
/*
* gen1 uses default DMA addr
*/
if (rsnd_is_gen1(priv))
return 0;
if (!mod)
return 0;
return rsnd_gen2_dma_addr(io, mod, is_play, is_from);
}
#define MOD_MAX (RSND_MOD_MAX + 1) /* +Memory */
static void rsnd_dma_of_path(struct rsnd_dma *dma,
struct rsnd_dai_stream *io,
int is_play,
struct rsnd_mod **mod_from,
struct rsnd_mod **mod_to)
{
struct rsnd_mod *this = rsnd_dma_to_mod(dma);
struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
struct rsnd_mod *src = rsnd_io_to_mod_src(io);
struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
struct rsnd_mod *mod[MOD_MAX];
struct rsnd_mod *mod_start, *mod_end;
struct rsnd_priv *priv = rsnd_mod_to_priv(this);
struct device *dev = rsnd_priv_to_dev(priv);
int nr, i;
if (!ssi)
return;
nr = 0;
for (i = 0; i < MOD_MAX; i++) {
mod[i] = NULL;
nr += !!rsnd_io_to_mod(io, i);
}
/*
* [S] -*-> [E]
* [S] -*-> SRC -o-> [E]
* [S] -*-> SRC -> DVC -o-> [E]
* [S] -*-> SRC -> CTU -> MIX -> DVC -o-> [E]
*
* playback [S] = mem
* [E] = SSI
*
* capture [S] = SSI
* [E] = mem
*
* -*-> Audio DMAC
* -o-> Audio DMAC peri peri
*/
mod_start = (is_play) ? NULL : ssi;
mod_end = (is_play) ? ssi : NULL;
mod[0] = mod_start;
for (i = 1; i < nr; i++) {
if (src) {
mod[i] = src;
src = NULL;
} else if (ctu) {
mod[i] = ctu;
ctu = NULL;
} else if (mix) {
mod[i] = mix;
mix = NULL;
} else if (dvc) {
mod[i] = dvc;
dvc = NULL;
}
}
mod[i] = mod_end;
/*
* | SSI | SRC |
* -------------+-----+-----+
* is_play | o | * |
* !is_play | * | o |
*/
if ((this == ssi) == (is_play)) {
*mod_from = mod[nr - 1];
*mod_to = mod[nr];
} else {
*mod_from = mod[0];
*mod_to = mod[1];
}
dev_dbg(dev, "module connection (this is %s[%d])\n",
rsnd_mod_name(this), rsnd_mod_id(this));
for (i = 0; i <= nr; i++) {
dev_dbg(dev, " %s[%d]%s\n",
rsnd_mod_name(mod[i]), rsnd_mod_id(mod[i]),
(mod[i] == *mod_from) ? " from" :
(mod[i] == *mod_to) ? " to" : "");
}
}
void rsnd_dma_stop(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
dma->ops->stop(io, dma);
}
void rsnd_dma_start(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
dma->ops->start(io, dma);
}
void rsnd_dma_quit(struct rsnd_dai_stream *io, struct rsnd_dma *dma)
{
struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
if (!dmac)
return;
dma->ops->quit(io, dma);
}
int rsnd_dma_init(struct rsnd_dai_stream *io, struct rsnd_dma *dma, int id)
{
struct rsnd_mod *mod_from = NULL;
struct rsnd_mod *mod_to = NULL;
struct rsnd_priv *priv = rsnd_io_to_priv(io);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
struct device *dev = rsnd_priv_to_dev(priv);
int is_play = rsnd_io_is_play(io);
/*
* DMA failed. try to PIO mode
* see
* rsnd_ssi_fallback()
* rsnd_rdai_continuance_probe()
*/
if (!dmac)
return -EAGAIN;
rsnd_dma_of_path(dma, io, is_play, &mod_from, &mod_to);
dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0);
/* for Gen2 */
if (mod_from && mod_to)
dma->ops = &rsnd_dmapp_ops;
else
dma->ops = &rsnd_dmaen_ops;
/* for Gen1, overwrite */
if (rsnd_is_gen1(priv))
dma->ops = &rsnd_dmaen_ops;
dev_dbg(dev, "%s %s[%d] -> %s[%d]\n",
dma->ops->name,
rsnd_mod_name(mod_from), rsnd_mod_id(mod_from),
rsnd_mod_name(mod_to), rsnd_mod_id(mod_to));
return dma->ops->init(io, dma, id, mod_from, mod_to);
}
int rsnd_dma_probe(struct platform_device *pdev,
const struct rsnd_of_data *of_data,
struct rsnd_priv *priv)
{
struct device *dev = rsnd_priv_to_dev(priv);
struct rsnd_dma_ctrl *dmac;
struct resource *res;
/*
* for Gen1
*/
if (rsnd_is_gen1(priv))
return 0;
/*
* for Gen2
*/
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
if (!dmac || !res) {
dev_err(dev, "dma allocate failed\n");
return 0; /* it will be PIO mode */
}
dmac->dmapp_num = 0;
dmac->base = devm_ioremap_resource(dev, res);
if (IS_ERR(dmac->base))
return PTR_ERR(dmac->base);
priv->dma = dmac;
return 0;
}