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// SPDX-License-Identifier: GPL-2.0
//
// Renesas R-Car SRC support
//
// Copyright (C) 2013 Renesas Solutions Corp.
// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
/*
* You can use Synchronous Sampling Rate Convert (if no DVC)
*
* amixer set "SRC Out Rate" on
* aplay xxx.wav &
* amixer set "SRC Out Rate" 96000 // convert rate to 96000Hz
* amixer set "SRC Out Rate" 22050 // convert rate to 22050Hz
*/
/*
* you can enable below define if you don't need
* SSI interrupt status debug message when debugging
* see rsnd_print_irq_status()
*
* #define RSND_DEBUG_NO_IRQ_STATUS 1
*/
#include <linux/of_irq.h>
#include "rsnd.h"
#define SRC_NAME "src"
/* SCU_SYSTEM_STATUS0/1 */
#define OUF_SRC(id) ((1 << (id + 16)) | (1 << id))
struct rsnd_src {
struct rsnd_mod mod;
struct rsnd_mod *dma;
struct rsnd_kctrl_cfg_s sen; /* sync convert enable */
struct rsnd_kctrl_cfg_s sync; /* sync convert */
int irq;
};
#define RSND_SRC_NAME_SIZE 16
#define rsnd_src_get(priv, id) ((struct rsnd_src *)(priv->src) + id)
#define rsnd_src_nr(priv) ((priv)->src_nr)
#define rsnd_src_sync_is_enabled(mod) (rsnd_mod_to_src(mod)->sen.val)
#define rsnd_mod_to_src(_mod) \
container_of((_mod), struct rsnd_src, mod)
#define for_each_rsnd_src(pos, priv, i) \
for ((i) = 0; \
((i) < rsnd_src_nr(priv)) && \
((pos) = (struct rsnd_src *)(priv)->src + i); \
i++)
/*
* image of SRC (Sampling Rate Converter)
*
* 96kHz <-> +-----+ 48kHz +-----+ 48kHz +-------+
* 48kHz <-> | SRC | <------> | SSI | <-----> | codec |
* 44.1kHz <-> +-----+ +-----+ +-------+
* ...
*
*/
static void rsnd_src_activation(struct rsnd_mod *mod)
{
rsnd_mod_write(mod, SRC_SWRSR, 0);
rsnd_mod_write(mod, SRC_SWRSR, 1);
}
static void rsnd_src_halt(struct rsnd_mod *mod)
{
rsnd_mod_write(mod, SRC_SRCIR, 1);
rsnd_mod_write(mod, SRC_SWRSR, 0);
}
static struct dma_chan *rsnd_src_dma_req(struct rsnd_dai_stream *io,
struct rsnd_mod *mod)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
int is_play = rsnd_io_is_play(io);
return rsnd_dma_request_channel(rsnd_src_of_node(priv),
SRC_NAME, mod,
is_play ? "rx" : "tx");
}
static u32 rsnd_src_convert_rate(struct rsnd_dai_stream *io,
struct rsnd_mod *mod)
{
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
struct rsnd_src *src = rsnd_mod_to_src(mod);
u32 convert_rate;
if (!runtime)
return 0;
if (!rsnd_src_sync_is_enabled(mod))
return rsnd_io_converted_rate(io);
convert_rate = src->sync.val;
if (!convert_rate)
convert_rate = rsnd_io_converted_rate(io);
if (!convert_rate)
convert_rate = runtime->rate;
return convert_rate;
}
unsigned int rsnd_src_get_rate(struct rsnd_priv *priv,
struct rsnd_dai_stream *io,
int is_in)
{
struct rsnd_mod *src_mod = rsnd_io_to_mod_src(io);
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
unsigned int rate = 0;
int is_play = rsnd_io_is_play(io);
/*
* Playback
* runtime_rate -> [SRC] -> convert_rate
*
* Capture
* convert_rate -> [SRC] -> runtime_rate
*/
if (is_play == is_in)
return runtime->rate;
/*
* return convert rate if SRC is used,
* otherwise, return runtime->rate as usual
*/
if (src_mod)
rate = rsnd_src_convert_rate(io, src_mod);
if (!rate)
rate = runtime->rate;
return rate;
}
static const u32 bsdsr_table_pattern1[] = {
0x01800000, /* 6 - 1/6 */
0x01000000, /* 6 - 1/4 */
0x00c00000, /* 6 - 1/3 */
0x00800000, /* 6 - 1/2 */
0x00600000, /* 6 - 2/3 */
0x00400000, /* 6 - 1 */
};
static const u32 bsdsr_table_pattern2[] = {
0x02400000, /* 6 - 1/6 */
0x01800000, /* 6 - 1/4 */
0x01200000, /* 6 - 1/3 */
0x00c00000, /* 6 - 1/2 */
0x00900000, /* 6 - 2/3 */
0x00600000, /* 6 - 1 */
};
static const u32 bsisr_table[] = {
0x00100060, /* 6 - 1/6 */
0x00100040, /* 6 - 1/4 */
0x00100030, /* 6 - 1/3 */
0x00100020, /* 6 - 1/2 */
0x00100020, /* 6 - 2/3 */
0x00100020, /* 6 - 1 */
};
static const u32 chan288888[] = {
0x00000006, /* 1 to 2 */
0x000001fe, /* 1 to 8 */
0x000001fe, /* 1 to 8 */
0x000001fe, /* 1 to 8 */
0x000001fe, /* 1 to 8 */
0x000001fe, /* 1 to 8 */
};
static const u32 chan244888[] = {
0x00000006, /* 1 to 2 */
0x0000001e, /* 1 to 4 */
0x0000001e, /* 1 to 4 */
0x000001fe, /* 1 to 8 */
0x000001fe, /* 1 to 8 */
0x000001fe, /* 1 to 8 */
};
static const u32 chan222222[] = {
0x00000006, /* 1 to 2 */
0x00000006, /* 1 to 2 */
0x00000006, /* 1 to 2 */
0x00000006, /* 1 to 2 */
0x00000006, /* 1 to 2 */
0x00000006, /* 1 to 2 */
};
static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
struct rsnd_mod *mod)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct device *dev = rsnd_priv_to_dev(priv);
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
int is_play = rsnd_io_is_play(io);
int use_src = 0;
u32 fin, fout;
u32 ifscr, fsrate, adinr;
u32 cr, route;
u32 i_busif, o_busif, tmp;
const u32 *bsdsr_table;
const u32 *chptn;
uint ratio;
int chan;
int idx;
if (!runtime)
return;
fin = rsnd_src_get_in_rate(priv, io);
fout = rsnd_src_get_out_rate(priv, io);
chan = rsnd_runtime_channel_original(io);
/* 6 - 1/6 are very enough ratio for SRC_BSDSR */
if (fin == fout)
ratio = 0;
else if (fin > fout)
ratio = 100 * fin / fout;
else
ratio = 100 * fout / fin;
if (ratio > 600) {
dev_err(dev, "FSO/FSI ratio error\n");
return;
}
use_src = (fin != fout) | rsnd_src_sync_is_enabled(mod);
/*
* SRC_ADINR
*/
adinr = rsnd_get_adinr_bit(mod, io) | chan;
/*
* SRC_IFSCR / SRC_IFSVR
*/
ifscr = 0;
fsrate = 0;
if (use_src) {
u64 n;
ifscr = 1;
n = (u64)0x0400000 * fin;
do_div(n, fout);
fsrate = n;
}
/*
* SRC_SRCCR / SRC_ROUTE_MODE0
*/
cr = 0x00011110;
route = 0x0;
if (use_src) {
route = 0x1;
if (rsnd_src_sync_is_enabled(mod)) {
cr |= 0x1;
route |= rsnd_io_is_play(io) ?
(0x1 << 24) : (0x1 << 25);
}
}
/*
* SRC_BSDSR / SRC_BSISR
*
* see
* Combination of Register Setting Related to
* FSO/FSI Ratio and Channel, Latency
*/
switch (rsnd_mod_id(mod)) {
case 0:
chptn = chan288888;
bsdsr_table = bsdsr_table_pattern1;
break;
case 1:
case 3:
case 4:
chptn = chan244888;
bsdsr_table = bsdsr_table_pattern1;
break;
case 2:
case 9:
chptn = chan222222;
bsdsr_table = bsdsr_table_pattern1;
break;
case 5:
case 6:
case 7:
case 8:
chptn = chan222222;
bsdsr_table = bsdsr_table_pattern2;
break;
default:
goto convert_rate_err;
}
/*
* E3 need to overwrite
*/
if (rsnd_is_e3(priv))
switch (rsnd_mod_id(mod)) {
case 0:
case 4:
chptn = chan222222;
}
for (idx = 0; idx < ARRAY_SIZE(chan222222); idx++)
if (chptn[idx] & (1 << chan))
break;
if (chan > 8 ||
idx >= ARRAY_SIZE(chan222222))
goto convert_rate_err;
/* BUSIF_MODE */
tmp = rsnd_get_busif_shift(io, mod);
i_busif = ( is_play ? tmp : 0) | 1;
o_busif = (!is_play ? tmp : 0) | 1;
rsnd_mod_write(mod, SRC_ROUTE_MODE0, route);
rsnd_mod_write(mod, SRC_SRCIR, 1); /* initialize */
rsnd_mod_write(mod, SRC_ADINR, adinr);
rsnd_mod_write(mod, SRC_IFSCR, ifscr);
rsnd_mod_write(mod, SRC_IFSVR, fsrate);
rsnd_mod_write(mod, SRC_SRCCR, cr);
rsnd_mod_write(mod, SRC_BSDSR, bsdsr_table[idx]);
rsnd_mod_write(mod, SRC_BSISR, bsisr_table[idx]);
rsnd_mod_write(mod, SRC_SRCIR, 0); /* cancel initialize */
rsnd_mod_write(mod, SRC_I_BUSIF_MODE, i_busif);
rsnd_mod_write(mod, SRC_O_BUSIF_MODE, o_busif);
rsnd_mod_write(mod, SRC_BUSIF_DALIGN, rsnd_get_dalign(mod, io));
rsnd_adg_set_src_timesel_gen2(mod, io, fin, fout);
return;
convert_rate_err:
dev_err(dev, "unknown BSDSR/BSDIR settings\n");
}
static int rsnd_src_irq(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv,
int enable)
{
struct rsnd_src *src = rsnd_mod_to_src(mod);
u32 sys_int_val, int_val, sys_int_mask;
int irq = src->irq;
int id = rsnd_mod_id(mod);
sys_int_val =
sys_int_mask = OUF_SRC(id);
int_val = 0x3300;
/*
* IRQ is not supported on non-DT
* see
* rsnd_src_probe_()
*/
if ((irq <= 0) || !enable) {
sys_int_val = 0;
int_val = 0;
}
/*
* WORKAROUND
*
* ignore over flow error when rsnd_src_sync_is_enabled()
*/
if (rsnd_src_sync_is_enabled(mod))
sys_int_val = sys_int_val & 0xffff;
rsnd_mod_write(mod, SRC_INT_ENABLE0, int_val);
rsnd_mod_bset(mod, SCU_SYS_INT_EN0, sys_int_mask, sys_int_val);
rsnd_mod_bset(mod, SCU_SYS_INT_EN1, sys_int_mask, sys_int_val);
return 0;
}
static void rsnd_src_status_clear(struct rsnd_mod *mod)
{
u32 val = OUF_SRC(rsnd_mod_id(mod));
rsnd_mod_write(mod, SCU_SYS_STATUS0, val);
rsnd_mod_write(mod, SCU_SYS_STATUS1, val);
}
static bool rsnd_src_error_occurred(struct rsnd_mod *mod)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct device *dev = rsnd_priv_to_dev(priv);
u32 val0, val1;
u32 status0, status1;
bool ret = false;
val0 = val1 = OUF_SRC(rsnd_mod_id(mod));
/*
* WORKAROUND
*
* ignore over flow error when rsnd_src_sync_is_enabled()
*/
if (rsnd_src_sync_is_enabled(mod))
val0 = val0 & 0xffff;
status0 = rsnd_mod_read(mod, SCU_SYS_STATUS0);
status1 = rsnd_mod_read(mod, SCU_SYS_STATUS1);
if ((status0 & val0) || (status1 & val1)) {
rsnd_print_irq_status(dev, "%s err status : 0x%08x, 0x%08x\n",
rsnd_mod_name(mod), status0, status1);
ret = true;
}
return ret;
}
static int rsnd_src_start(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
u32 val;
/*
* WORKAROUND
*
* Enable SRC output if you want to use sync convert together with DVC
*/
val = (rsnd_io_to_mod_dvc(io) && !rsnd_src_sync_is_enabled(mod)) ?
0x01 : 0x11;
rsnd_mod_write(mod, SRC_CTRL, val);
return 0;
}
static int rsnd_src_stop(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
rsnd_mod_write(mod, SRC_CTRL, 0);
return 0;
}
static int rsnd_src_init(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_src *src = rsnd_mod_to_src(mod);
int ret;
/* reset sync convert_rate */
src->sync.val = 0;
ret = rsnd_mod_power_on(mod);
if (ret < 0)
return ret;
rsnd_src_activation(mod);
rsnd_src_set_convert_rate(io, mod);
rsnd_src_status_clear(mod);
return 0;
}
static int rsnd_src_quit(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_src *src = rsnd_mod_to_src(mod);
rsnd_src_halt(mod);
rsnd_mod_power_off(mod);
/* reset sync convert_rate */
src->sync.val = 0;
return 0;
}
static void __rsnd_src_interrupt(struct rsnd_mod *mod,
struct rsnd_dai_stream *io)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
bool stop = false;
spin_lock(&priv->lock);
/* ignore all cases if not working */
if (!rsnd_io_is_working(io))
goto rsnd_src_interrupt_out;
if (rsnd_src_error_occurred(mod))
stop = true;
rsnd_src_status_clear(mod);
rsnd_src_interrupt_out:
spin_unlock(&priv->lock);
if (stop)
snd_pcm_stop_xrun(io->substream);
}
static irqreturn_t rsnd_src_interrupt(int irq, void *data)
{
struct rsnd_mod *mod = data;
rsnd_mod_interrupt(mod, __rsnd_src_interrupt);
return IRQ_HANDLED;
}
static int rsnd_src_probe_(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct rsnd_priv *priv)
{
struct rsnd_src *src = rsnd_mod_to_src(mod);
struct device *dev = rsnd_priv_to_dev(priv);
int irq = src->irq;
int ret;
if (irq > 0) {
/*
* IRQ is not supported on non-DT
* see
* rsnd_src_irq()
*/
ret = devm_request_irq(dev, irq,
rsnd_src_interrupt,
IRQF_SHARED,
dev_name(dev), mod);
if (ret)
return ret;
}
ret = rsnd_dma_attach(io, mod, &src->dma);
return ret;
}
static int rsnd_src_pcm_new(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
struct snd_soc_pcm_runtime *rtd)
{
struct rsnd_src *src = rsnd_mod_to_src(mod);
int ret;
/*
* enable SRC sync convert if possible
*/
/*
* It can't use SRC Synchronous convert
* when Capture if it uses CMD
*/
if (rsnd_io_to_mod_cmd(io) && !rsnd_io_is_play(io))
return 0;
/*
* enable sync convert
*/
ret = rsnd_kctrl_new_s(mod, io, rtd,
rsnd_io_is_play(io) ?
"SRC Out Rate Switch" :
"SRC In Rate Switch",
rsnd_kctrl_accept_anytime,
rsnd_src_set_convert_rate,
&src->sen, 1);
if (ret < 0)
return ret;
ret = rsnd_kctrl_new_s(mod, io, rtd,
rsnd_io_is_play(io) ?
"SRC Out Rate" :
"SRC In Rate",
rsnd_kctrl_accept_runtime,
rsnd_src_set_convert_rate,
&src->sync, 192000);
return ret;
}
#ifdef CONFIG_DEBUG_FS
static void rsnd_src_debug_info(struct seq_file *m,
struct rsnd_dai_stream *io,
struct rsnd_mod *mod)
{
rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SCU,
rsnd_mod_id(mod) * 0x20, 0x20);
seq_puts(m, "\n");
rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SCU,
0x1c0, 0x20);
seq_puts(m, "\n");
rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SCU,
0x200 + rsnd_mod_id(mod) * 0x40, 0x40);
}
#define DEBUG_INFO .debug_info = rsnd_src_debug_info
#else
#define DEBUG_INFO
#endif
static struct rsnd_mod_ops rsnd_src_ops = {
.name = SRC_NAME,
.dma_req = rsnd_src_dma_req,
.probe = rsnd_src_probe_,
.init = rsnd_src_init,
.quit = rsnd_src_quit,
.start = rsnd_src_start,
.stop = rsnd_src_stop,
.irq = rsnd_src_irq,
.pcm_new = rsnd_src_pcm_new,
.get_status = rsnd_mod_get_status,
DEBUG_INFO
};
struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id)
{
if (WARN_ON(id < 0 || id >= rsnd_src_nr(priv)))
id = 0;
return rsnd_mod_get(rsnd_src_get(priv, id));
}
int rsnd_src_probe(struct rsnd_priv *priv)
{
struct device_node *node;
struct device_node *np;
struct device *dev = rsnd_priv_to_dev(priv);
struct rsnd_src *src;
struct clk *clk;
char name[RSND_SRC_NAME_SIZE];
int i, nr, ret;
/* This driver doesn't support Gen1 at this point */
if (rsnd_is_gen1(priv))
return 0;
node = rsnd_src_of_node(priv);
if (!node)
return 0; /* not used is not error */
nr = rsnd_node_count(priv, node, SRC_NAME);
if (!nr) {
ret = -EINVAL;
goto rsnd_src_probe_done;
}
src = devm_kcalloc(dev, nr, sizeof(*src), GFP_KERNEL);
if (!src) {
ret = -ENOMEM;
goto rsnd_src_probe_done;
}
priv->src_nr = nr;
priv->src = src;
i = 0;
for_each_child_of_node(node, np) {
if (!of_device_is_available(np))
goto skip;
i = rsnd_node_fixed_index(dev, np, SRC_NAME, i);
if (i < 0) {
ret = -EINVAL;
of_node_put(np);
goto rsnd_src_probe_done;
}
src = rsnd_src_get(priv, i);
snprintf(name, RSND_SRC_NAME_SIZE, "%s.%d",
SRC_NAME, i);
src->irq = irq_of_parse_and_map(np, 0);
if (!src->irq) {
ret = -EINVAL;
of_node_put(np);
goto rsnd_src_probe_done;
}
clk = devm_clk_get(dev, name);
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
of_node_put(np);
goto rsnd_src_probe_done;
}
ret = rsnd_mod_init(priv, rsnd_mod_get(src),
&rsnd_src_ops, clk, RSND_MOD_SRC, i);
if (ret) {
of_node_put(np);
goto rsnd_src_probe_done;
}
skip:
i++;
}
ret = 0;
rsnd_src_probe_done:
of_node_put(node);
return ret;
}
void rsnd_src_remove(struct rsnd_priv *priv)
{
struct rsnd_src *src;
int i;
for_each_rsnd_src(src, priv, i) {
rsnd_mod_quit(rsnd_mod_get(src));
}
}