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linux-zen-desktop/sound/soc/sh/rcar/dma.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0
//
// Renesas R-Car Audio DMAC support
//
// Copyright (C) 2015 Renesas Electronics Corp.
// Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
#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_dmaen {
struct dma_chan *chan;
dma_cookie_t cookie;
unsigned int dma_len;
};
struct rsnd_dmapp {
int dmapp_id;
u32 chcr;
};
struct rsnd_dma {
struct rsnd_mod mod;
struct rsnd_mod *mod_from;
struct rsnd_mod *mod_to;
dma_addr_t src_addr;
dma_addr_t dst_addr;
union {
struct rsnd_dmaen en;
struct rsnd_dmapp pp;
} dma;
};
struct rsnd_dma_ctrl {
void __iomem *ppbase;
phys_addr_t ppres;
int dmaen_num;
int dmapp_num;
};
#define rsnd_priv_to_dmac(p) ((struct rsnd_dma_ctrl *)(p)->dma)
#define rsnd_mod_to_dma(_mod) container_of((_mod), struct rsnd_dma, mod)
#define rsnd_dma_to_dmaen(dma) (&(dma)->dma.en)
#define rsnd_dma_to_dmapp(dma) (&(dma)->dma.pp)
/* for DEBUG */
static struct rsnd_mod_ops mem_ops = {
.name = "mem",
};
static struct rsnd_mod mem = {
};
/*
* Audio DMAC
*/
static void __rsnd_dmaen_complete(struct rsnd_mod *mod,
struct rsnd_dai_stream *io)
{
if (rsnd_io_is_working(io))
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 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_stop(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
if (dmaen->chan)
dmaengine_terminate_async(dmaen->chan);
return 0;
}
static int rsnd_dmaen_cleanup(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
/*
* DMAEngine release uses mutex lock.
* Thus, it shouldn't be called under spinlock.
* Let's call it under prepare
*/
if (dmaen->chan)
dma_release_channel(dmaen->chan);
dmaen->chan = NULL;
return 0;
}
static int rsnd_dmaen_prepare(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
struct device *dev = rsnd_priv_to_dev(priv);
/* maybe suspended */
if (dmaen->chan)
return 0;
/*
* DMAEngine request uses mutex lock.
* Thus, it shouldn't be called under spinlock.
* Let's call it under prepare
*/
dmaen->chan = rsnd_dmaen_request_channel(io,
dma->mod_from,
dma->mod_to);
if (IS_ERR_OR_NULL(dmaen->chan)) {
dmaen->chan = NULL;
dev_err(dev, "can't get dma channel\n");
return -EIO;
}
return 0;
}
static int rsnd_dmaen_start(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
struct snd_pcm_substream *substream = io->substream;
struct device *dev = rsnd_priv_to_dev(priv);
struct dma_async_tx_descriptor *desc;
struct dma_slave_config cfg = {};
enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
int is_play = rsnd_io_is_play(io);
int ret;
/*
* in case of monaural data writing or reading through Audio-DMAC
* data is always in Left Justified format, so both src and dst
* DMA Bus width need to be set equal to physical data width.
*/
if (rsnd_runtime_channel_original(io) == 1) {
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
int bits = snd_pcm_format_physical_width(runtime->format);
switch (bits) {
case 8:
buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
break;
case 16:
buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
break;
case 32:
buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
default:
dev_err(dev, "invalid format width %d\n", bits);
return -EINVAL;
}
}
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 = buswidth;
cfg.dst_addr_width = buswidth;
dev_dbg(dev, "%s %pad -> %pad\n",
rsnd_mod_name(mod),
&cfg.src_addr, &cfg.dst_addr);
ret = dmaengine_slave_config(dmaen->chan, &cfg);
if (ret < 0)
return ret;
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 -EIO;
}
desc->callback = rsnd_dmaen_complete;
desc->callback_param = rsnd_mod_get(dma);
dmaen->dma_len = snd_pcm_lib_buffer_bytes(substream);
dmaen->cookie = dmaengine_submit(desc);
if (dmaen->cookie < 0) {
dev_err(dev, "dmaengine_submit() fail\n");
return -EIO;
}
dma_async_issue_pending(dmaen->chan);
return 0;
}
struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node, char *name,
struct rsnd_mod *mod, char *x)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct device *dev = rsnd_priv_to_dev(priv);
struct dma_chan *chan = NULL;
struct device_node *np;
int i = 0;
for_each_child_of_node(of_node, np) {
i = rsnd_node_fixed_index(dev, np, name, i);
if (i < 0) {
chan = NULL;
of_node_put(np);
break;
}
if (i == rsnd_mod_id_raw(mod) && (!chan))
chan = of_dma_request_slave_channel(np, x);
i++;
}
/* It should call of_node_put(), since, it is rsnd_xxx_of_node() */
of_node_put(of_node);
return chan;
}
static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
struct rsnd_dma *dma,
struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
{
struct rsnd_priv *priv = rsnd_io_to_priv(io);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
struct dma_chan *chan;
/* try to get DMAEngine channel */
chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
if (IS_ERR_OR_NULL(chan)) {
/* Let's follow when -EPROBE_DEFER case */
if (PTR_ERR(chan) == -EPROBE_DEFER)
return PTR_ERR(chan);
/*
* DMA failed. try to PIO mode
* see
* rsnd_ssi_fallback()
* rsnd_rdai_continuance_probe()
*/
return -EAGAIN;
}
/*
* use it for IPMMU if needed
* see
* rsnd_preallocate_pages()
*/
io->dmac_dev = chan->device->dev;
dma_release_channel(chan);
dmac->dmaen_num++;
return 0;
}
static int rsnd_dmaen_pointer(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
snd_pcm_uframes_t *pointer)
{
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
struct dma_tx_state state;
enum dma_status status;
unsigned int pos = 0;
status = dmaengine_tx_status(dmaen->chan, dmaen->cookie, &state);
if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
if (state.residue > 0 && state.residue <= dmaen->dma_len)
pos = dmaen->dma_len - state.residue;
}
*pointer = bytes_to_frames(runtime, pos);
return 0;
}
static struct rsnd_mod_ops rsnd_dmaen_ops = {
.name = "audmac",
.prepare = rsnd_dmaen_prepare,
.cleanup = rsnd_dmaen_cleanup,
.start = rsnd_dmaen_start,
.stop = rsnd_dmaen_stop,
.pointer = rsnd_dmaen_pointer,
.get_status = rsnd_mod_get_status,
};
/*
* Audio DMAC peri peri
*/
static const u8 gen2_id_table_ssiu[] = {
/* SSI00 ~ SSI07 */
0x00, 0x01, 0x02, 0x03, 0x39, 0x3a, 0x3b, 0x3c,
/* SSI10 ~ SSI17 */
0x04, 0x05, 0x06, 0x07, 0x3d, 0x3e, 0x3f, 0x40,
/* SSI20 ~ SSI27 */
0x08, 0x09, 0x0a, 0x0b, 0x41, 0x42, 0x43, 0x44,
/* SSI30 ~ SSI37 */
0x0c, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b,
/* SSI40 ~ SSI47 */
0x0d, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52,
/* SSI5 */
0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* SSI6 */
0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* SSI7 */
0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* SSI8 */
0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* SSI90 ~ SSI97 */
0x12, 0x13, 0x14, 0x15, 0x53, 0x54, 0x55, 0x56,
};
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 *ssiu = rsnd_io_to_mod_ssiu(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 = 255;
int size = 0;
if ((mod == ssi) ||
(mod == ssiu)) {
int busif = rsnd_mod_id_sub(ssiu);
entry = gen2_id_table_ssiu;
size = ARRAY_SIZE(gen2_id_table_ssiu);
id = (rsnd_mod_id(mod) * 8) + busif;
} else if (mod == src) {
entry = gen2_id_table_scu;
size = ARRAY_SIZE(gen2_id_table_scu);
id = rsnd_mod_id(mod);
} else if (mod == dvc) {
entry = gen2_id_table_cmd;
size = ARRAY_SIZE(gen2_id_table_cmd);
id = rsnd_mod_id(mod);
}
if ((!entry) || (size <= id)) {
struct device *dev = rsnd_priv_to_dev(rsnd_io_to_priv(io));
dev_err(dev, "unknown connection (%s)\n", rsnd_mod_name(mod));
/* use non-prohibited SRS number as error */
return 0x00; /* SSI00 */
}
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->ppbase + 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_mod_get(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 0x%px : %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_mod_get(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_bset(struct rsnd_dma *dma, u32 data, u32 mask, u32 reg)
{
struct rsnd_mod *mod = rsnd_mod_get(dma);
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
void __iomem *addr = rsnd_dmapp_addr(dmac, dma, reg);
u32 val = ioread32(addr);
val &= ~mask;
val |= (data & mask);
iowrite32(val, addr);
}
static int rsnd_dmapp_stop(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
int i;
rsnd_dmapp_bset(dma, 0, PDMACHCR_DE, PDMACHCR);
for (i = 0; i < 1024; i++) {
if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
return 0;
udelay(1);
}
return -EIO;
}
static int rsnd_dmapp_start(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
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);
return 0;
}
static int rsnd_dmapp_attach(struct rsnd_dai_stream *io,
struct rsnd_dma *dma,
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++;
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;
}
#ifdef CONFIG_DEBUG_FS
static void rsnd_dmapp_debug_info(struct seq_file *m,
struct rsnd_dai_stream *io,
struct rsnd_mod *mod)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
rsnd_debugfs_reg_show(m, dmac->ppres, dmac->ppbase,
0x20 + 0x10 * dmapp->dmapp_id, 0x10);
}
#define DEBUG_INFO .debug_info = rsnd_dmapp_debug_info
#else
#define DEBUG_INFO
#endif
static struct rsnd_mod_ops rsnd_dmapp_ops = {
.name = "audmac-pp",
.start = rsnd_dmapp_start,
.stop = rsnd_dmapp_stop,
.quit = rsnd_dmapp_stop,
.get_status = rsnd_mod_get_status,
DEBUG_INFO
};
/*
* 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, j) (addr ##_reg - 0x00441000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
#define RDMA_SSIU_O_N(addr, i, j) RDMA_SSIU_I_N(addr, i, j)
#define RDMA_SSIU_I_P(addr, i, j) (addr ##_reg - 0x00141000 + (0x1000 * (i)) + (((j) / 4) * 0xA000) + (((j) % 4) * 0x400) - (0x4000 * ((i) / 9) * ((j) / 4)))
#define RDMA_SSIU_O_P(addr, i, j) RDMA_SSIU_I_P(addr, i, j)
#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) ||
!!(rsnd_io_to_mod_ssiu(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);
int busif = rsnd_mod_id_sub(rsnd_io_to_mod_ssiu(io));
struct dma_addr {
dma_addr_t out_addr;
dma_addr_t in_addr;
} dma_addrs[3][2][3] = {
/* SRC */
/* Capture */
{{{ 0, 0 },
{ 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, busif), 0 },
{ RDMA_SSIU_O_P(ssi, id, busif), 0 } },
/* Playback */
{{ 0, RDMA_SSI_I_N(ssi, id) },
{ 0, RDMA_SSIU_I_P(ssi, id, busif) },
{ 0, RDMA_SSIU_I_P(ssi, id, busif) } }
},
/* SSIU */
/* Capture */
{{{ RDMA_SSIU_O_N(ssi, id, busif), 0 },
{ RDMA_SSIU_O_P(ssi, id, busif), 0 },
{ RDMA_SSIU_O_P(ssi, id, busif), 0 } },
/* Playback */
{{ 0, RDMA_SSIU_I_N(ssi, id, busif) },
{ 0, RDMA_SSIU_I_P(ssi, id, busif) },
{ 0, RDMA_SSIU_I_P(ssi, id, busif) } } },
};
/*
* FIXME
*
* We can't support SSI9-4/5/6/7, because its address is
* out of calculation rule
*/
if ((id == 9) && (busif >= 4))
dev_err(dev, "This driver doesn't support SSI%d-%d, so far",
id, busif);
/* 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;
}
/*
* Gen4 DMA read/write register offset
*
* ex) R-Car V4H case
* mod / SYS-DMAC in / SYS-DMAC out
* SSI_SDMC: 0xec400000 / 0xec400000 / 0xec400000
*/
#define RDMA_SSI_SDMC(addr, i) (addr + (0x8000 * i))
static dma_addr_t
rsnd_gen4_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);
phys_addr_t addr = rsnd_gen_get_phy_addr(priv, RSND_GEN4_SDMC);
int id = rsnd_mod_id(mod);
int busif = rsnd_mod_id_sub(mod);
/*
* SSI0 only is supported
*/
if (id != 0) {
struct device *dev = rsnd_priv_to_dev(priv);
dev_err(dev, "This driver doesn't support non SSI0");
return -EINVAL;
}
return RDMA_SSI_SDMC(addr, busif);
}
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);
if (!mod)
return 0;
/*
* gen1 uses default DMA addr
*/
if (rsnd_is_gen1(priv))
return 0;
else if (rsnd_is_gen4(priv))
return rsnd_gen4_dma_addr(io, mod, is_play, is_from);
else
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_mod *this,
struct rsnd_dai_stream *io,
int is_play,
struct rsnd_mod **mod_from,
struct rsnd_mod **mod_to)
{
struct rsnd_mod *ssi;
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, idx;
/*
* It should use "rcar_sound,ssiu" on DT.
* But, we need to keep compatibility for old version.
*
* If it has "rcar_sound.ssiu", it will be used.
* If not, "rcar_sound.ssi" will be used.
* see
* rsnd_ssiu_dma_req()
* rsnd_ssi_dma_req()
*/
if (rsnd_ssiu_of_node(priv)) {
struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
/* use SSIU */
ssi = ssiu;
if (this == rsnd_io_to_mod_ssi(io))
this = ssiu;
} else {
/* keep compatible, use SSI */
ssi = rsnd_io_to_mod_ssi(io);
}
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;
idx = 0;
mod[idx++] = mod_start;
for (i = 1; i < nr; i++) {
if (src) {
mod[idx++] = src;
src = NULL;
} else if (ctu) {
mod[idx++] = ctu;
ctu = NULL;
} else if (mix) {
mod[idx++] = mix;
mix = NULL;
} else if (dvc) {
mod[idx++] = dvc;
dvc = NULL;
}
}
mod[idx] = mod_end;
/*
* | SSI | SRC |
* -------------+-----+-----+
* is_play | o | * |
* !is_play | * | o |
*/
if ((this == ssi) == (is_play)) {
*mod_from = mod[idx - 1];
*mod_to = mod[idx];
} else {
*mod_from = mod[0];
*mod_to = mod[1];
}
dev_dbg(dev, "module connection (this is %s)\n", rsnd_mod_name(this));
for (i = 0; i <= idx; i++) {
dev_dbg(dev, " %s%s\n",
rsnd_mod_name(mod[i] ? mod[i] : &mem),
(mod[i] == *mod_from) ? " from" :
(mod[i] == *mod_to) ? " to" : "");
}
}
static int rsnd_dma_alloc(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
struct rsnd_mod **dma_mod)
{
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);
struct rsnd_dma *dma;
struct rsnd_mod_ops *ops;
enum rsnd_mod_type type;
int (*attach)(struct rsnd_dai_stream *io, struct rsnd_dma *dma,
struct rsnd_mod *mod_from, struct rsnd_mod *mod_to);
int is_play = rsnd_io_is_play(io);
int ret, dma_id;
/*
* DMA failed. try to PIO mode
* see
* rsnd_ssi_fallback()
* rsnd_rdai_continuance_probe()
*/
if (!dmac)
return -EAGAIN;
rsnd_dma_of_path(mod, io, is_play, &mod_from, &mod_to);
/* for Gen2 or later */
if (mod_from && mod_to) {
ops = &rsnd_dmapp_ops;
attach = rsnd_dmapp_attach;
dma_id = dmac->dmapp_num;
type = RSND_MOD_AUDMAPP;
} else {
ops = &rsnd_dmaen_ops;
attach = rsnd_dmaen_attach;
dma_id = dmac->dmaen_num;
type = RSND_MOD_AUDMA;
}
/* for Gen1, overwrite */
if (rsnd_is_gen1(priv)) {
ops = &rsnd_dmaen_ops;
attach = rsnd_dmaen_attach;
dma_id = dmac->dmaen_num;
type = RSND_MOD_AUDMA;
}
dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
if (!dma)
return -ENOMEM;
*dma_mod = rsnd_mod_get(dma);
ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
type, dma_id);
if (ret < 0)
return ret;
dev_dbg(dev, "%s %s -> %s\n",
rsnd_mod_name(*dma_mod),
rsnd_mod_name(mod_from ? mod_from : &mem),
rsnd_mod_name(mod_to ? mod_to : &mem));
ret = attach(io, dma, mod_from, mod_to);
if (ret < 0)
return ret;
dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
dma->dst_addr = rsnd_dma_addr(io, mod_to, is_play, 0);
dma->mod_from = mod_from;
dma->mod_to = mod_to;
return 0;
}
int rsnd_dma_attach(struct rsnd_dai_stream *io, struct rsnd_mod *mod,
struct rsnd_mod **dma_mod)
{
if (!(*dma_mod)) {
int ret = rsnd_dma_alloc(io, mod, dma_mod);
if (ret < 0)
return ret;
}
return rsnd_dai_connect(*dma_mod, io, (*dma_mod)->type);
}
int rsnd_dma_probe(struct rsnd_priv *priv)
{
struct platform_device *pdev = rsnd_priv_to_pdev(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 or later
*/
dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
if (!dmac) {
dev_err(dev, "dma allocate failed\n");
return 0; /* it will be PIO mode */
}
/* for Gen4 doesn't have DMA-pp */
if (rsnd_is_gen4(priv))
goto audmapp_end;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
if (!res) {
dev_err(dev, "lack of audmapp in DT\n");
return 0; /* it will be PIO mode */
}
dmac->dmapp_num = 0;
dmac->ppres = res->start;
dmac->ppbase = devm_ioremap_resource(dev, res);
if (IS_ERR(dmac->ppbase))
return PTR_ERR(dmac->ppbase);
audmapp_end:
priv->dma = dmac;
/* dummy mem mod for debug */
return rsnd_mod_init(NULL, &mem, &mem_ops, NULL, 0, 0);
}