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|
/*
* Helper routines for R-Car sound ADG.
*
* Copyright (C) 2013 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/clk-provider.h>
#include "rsnd.h"
#define CLKA 0
#define CLKB 1
#define CLKC 2
#define CLKI 3
#define CLKMAX 4
#define CLKOUT 0
#define CLKOUT1 1
#define CLKOUT2 2
#define CLKOUT3 3
#define CLKOUTMAX 4
#define BRRx_MASK(x) (0x3FF & x)
static struct rsnd_mod_ops adg_ops = {
.name = "adg",
};
struct rsnd_adg {
struct clk *clk[CLKMAX];
struct clk *clkout[CLKOUTMAX];
struct clk_onecell_data onecell;
struct rsnd_mod mod;
u32 flags;
u32 ckr;
u32 rbga;
u32 rbgb;
int rbga_rate_for_441khz; /* RBGA */
int rbgb_rate_for_48khz; /* RBGB */
};
#define LRCLK_ASYNC (1 << 0)
#define AUDIO_OUT_48 (1 << 1)
#define adg_mode_flags(adg) (adg->flags)
#define for_each_rsnd_clk(pos, adg, i) \
for (i = 0; \
(i < CLKMAX) && \
((pos) = adg->clk[i]); \
i++)
#define for_each_rsnd_clkout(pos, adg, i) \
for (i = 0; \
(i < CLKOUTMAX) && \
((pos) = adg->clkout[i]); \
i++)
#define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg)
static u32 rsnd_adg_calculate_rbgx(unsigned long div)
{
int i, ratio;
if (!div)
return 0;
for (i = 3; i >= 0; i--) {
ratio = 2 << (i * 2);
if (0 == (div % ratio))
return (u32)((i << 8) | ((div / ratio) - 1));
}
return ~0;
}
static u32 rsnd_adg_ssi_ws_timing_gen2(struct rsnd_dai_stream *io)
{
struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
int id = rsnd_mod_id(ssi_mod);
int ws = id;
if (rsnd_ssi_is_pin_sharing(io)) {
switch (id) {
case 1:
case 2:
ws = 0;
break;
case 4:
ws = 3;
break;
case 8:
ws = 7;
break;
}
}
return (0x6 + ws) << 8;
}
static void __rsnd_adg_get_timesel_ratio(struct rsnd_priv *priv,
struct rsnd_dai_stream *io,
unsigned int target_rate,
unsigned int *target_val,
unsigned int *target_en)
{
struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
struct device *dev = rsnd_priv_to_dev(priv);
int idx, sel, div, step;
unsigned int val, en;
unsigned int min, diff;
unsigned int sel_rate[] = {
clk_get_rate(adg->clk[CLKA]), /* 0000: CLKA */
clk_get_rate(adg->clk[CLKB]), /* 0001: CLKB */
clk_get_rate(adg->clk[CLKC]), /* 0010: CLKC */
adg->rbga_rate_for_441khz, /* 0011: RBGA */
adg->rbgb_rate_for_48khz, /* 0100: RBGB */
};
min = ~0;
val = 0;
en = 0;
for (sel = 0; sel < ARRAY_SIZE(sel_rate); sel++) {
idx = 0;
step = 2;
if (!sel_rate[sel])
continue;
for (div = 2; div <= 98304; div += step) {
diff = abs(target_rate - sel_rate[sel] / div);
if (min > diff) {
val = (sel << 8) | idx;
min = diff;
en = 1 << (sel + 1); /* fixme */
}
/*
* step of 0_0000 / 0_0001 / 0_1101
* are out of order
*/
if ((idx > 2) && (idx % 2))
step *= 2;
if (idx == 0x1c) {
div += step;
step *= 2;
}
idx++;
}
}
if (min == ~0) {
dev_err(dev, "no Input clock\n");
return;
}
*target_val = val;
if (target_en)
*target_en = en;
}
static void rsnd_adg_get_timesel_ratio(struct rsnd_priv *priv,
struct rsnd_dai_stream *io,
unsigned int in_rate,
unsigned int out_rate,
u32 *in, u32 *out, u32 *en)
{
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
unsigned int target_rate;
u32 *target_val;
u32 _in;
u32 _out;
u32 _en;
/* default = SSI WS */
_in =
_out = rsnd_adg_ssi_ws_timing_gen2(io);
target_rate = 0;
target_val = NULL;
_en = 0;
if (runtime->rate != in_rate) {
target_rate = out_rate;
target_val = &_out;
} else if (runtime->rate != out_rate) {
target_rate = in_rate;
target_val = &_in;
}
if (target_rate)
__rsnd_adg_get_timesel_ratio(priv, io,
target_rate,
target_val, &_en);
if (in)
*in = _in;
if (out)
*out = _out;
if (en)
*en = _en;
}
int rsnd_adg_set_cmd_timsel_gen2(struct rsnd_mod *cmd_mod,
struct rsnd_dai_stream *io)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(cmd_mod);
struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
struct rsnd_mod *adg_mod = rsnd_mod_get(adg);
int id = rsnd_mod_id(cmd_mod);
int shift = (id % 2) ? 16 : 0;
u32 mask, val;
rsnd_adg_get_timesel_ratio(priv, io,
rsnd_src_get_in_rate(priv, io),
rsnd_src_get_out_rate(priv, io),
NULL, &val, NULL);
val = val << shift;
mask = 0xffff << shift;
rsnd_mod_bset(adg_mod, CMDOUT_TIMSEL, mask, val);
return 0;
}
int rsnd_adg_set_src_timesel_gen2(struct rsnd_mod *src_mod,
struct rsnd_dai_stream *io,
unsigned int in_rate,
unsigned int out_rate)
{
struct rsnd_priv
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