adg.c
/*
* 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/sh_clk.h>
#include "rsnd.h"
#define CLKA 0
#define CLKB 1
#define CLKC 2
#define CLKI 3
#define CLKMAX 4
struct rsnd_adg {
struct clk *clk[CLKMAX];
int rbga_rate_for_441khz_div_6; /* RBGA */
int rbgb_rate_for_48khz_div_6; /* RBGB */
u32 ckr;
};
#define for_each_rsnd_clk(pos, adg, i) \
for (i = 0; \
(i < CLKMAX) && \
((pos) = adg->clk[i]); \
i++)
#define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg)
static u32 rsnd_adg_ssi_ws_timing_gen2(struct rsnd_dai_stream *io)
{
struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
int id = rsnd_mod_id(mod);
int ws = id;
if (rsnd_ssi_is_pin_sharing(rsnd_ssi_mod_get(priv, id))) {
switch (id) {
case 1:
case 2:
ws = 0;
break;
case 4:
ws = 3;
break;
case 8:
ws = 7;
break;
}
}
return (0x6 + ws) << 8;
}
int rsnd_adg_set_cmd_timsel_gen2(struct rsnd_dai *rdai,
struct rsnd_mod *mod,
struct rsnd_dai_stream *io)
{
int id = rsnd_mod_id(mod);
int shift = (id % 2) ? 16 : 0;
u32 mask, val;
val = rsnd_adg_ssi_ws_timing_gen2(io);
val = val << shift;
mask = 0xffff << shift;
rsnd_mod_bset(mod, CMDOUT_TIMSEL, mask, val);
return 0;
}
static int rsnd_adg_set_src_timsel_gen2(struct rsnd_dai *rdai,
struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
u32 timsel)
{
int is_play = rsnd_dai_is_play(rdai, io);
int id = rsnd_mod_id(mod);
int shift = (id % 2) ? 16 : 0;
u32 mask, ws;
u32 in, out;
ws = rsnd_adg_ssi_ws_timing_gen2(io);
in = (is_play) ? timsel : ws;
out = (is_play) ? ws : timsel;
in = in << shift;
out = out << shift;
mask = 0xffff << shift;
switch (id / 2) {
case 0:
rsnd_mod_bset(mod, SRCIN_TIMSEL0, mask, in);
rsnd_mod_bset(mod, SRCOUT_TIMSEL0, mask, out);
break;
case 1:
rsnd_mod_bset(mod, SRCIN_TIMSEL1, mask, in);
rsnd_mod_bset(mod, SRCOUT_TIMSEL1, mask, out);
break;
case 2:
rsnd_mod_bset(mod, SRCIN_TIMSEL2, mask, in);
rsnd_mod_bset(mod, SRCOUT_TIMSEL2, mask, out);
break;
case 3:
rsnd_mod_bset(mod, SRCIN_TIMSEL3, mask, in);
rsnd_mod_bset(mod, SRCOUT_TIMSEL3, mask, out);
break;
case 4:
rsnd_mod_bset(mod, SRCIN_TIMSEL4, mask, in);
rsnd_mod_bset(mod, SRCOUT_TIMSEL4, mask, out);
break;
}
return 0;
}
int rsnd_adg_set_convert_clk_gen2(struct rsnd_mod *mod,
struct rsnd_dai *rdai,
struct rsnd_dai_stream *io,
unsigned int src_rate,
unsigned int dst_rate)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
struct device *dev = rsnd_priv_to_dev(priv);
int idx, sel, div, step, ret;
u32 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_div_6,/* 0011: RBGA */
adg->rbgb_rate_for_48khz_div_6, /* 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(src_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 -EIO;
}
ret = rsnd_adg_set_src_timsel_gen2(rdai, mod, io, val);
if (ret < 0) {
dev_err(dev, "timsel error\n");
return ret;
}
rsnd_mod_bset(mod, DIV_EN, en, en);
return 0;
}
int rsnd_adg_set_convert_timing_gen2(struct rsnd_mod *mod,
struct rsnd_dai *rdai,
struct rsnd_dai_stream *io)
{
u32 val = rsnd_adg_ssi_ws_timing_gen2(io);
return rsnd_adg_set_src_timsel_gen2(rdai, mod, io, val);
}
int rsnd_adg_set_convert_clk_gen1(struct rsnd_priv *priv,
struct rsnd_mod *mod,
unsigned int src_rate,
unsigned int dst_rate)
{
struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
struct device *dev = rsnd_priv_to_dev(priv);
int idx, sel, div, shift;
u32 mask, val;
int id = rsnd_mod_id(mod);
unsigned int sel_rate [] = {
clk_get_rate(adg->clk[CLKA]), /* 000: CLKA */
clk_get_rate(adg->clk[CLKB]), /* 001: CLKB */
clk_get_rate(adg->clk[CLKC]), /* 010: CLKC */
0, /* 011: MLBCLK (not used) */
adg->rbga_rate_for_441khz_div_6,/* 100: RBGA */
adg->rbgb_rate_for_48khz_div_6, /* 101: RBGB */
};
/* find div (= 1/128, 1/256, 1/512, 1/1024, 1/2048 */
for (sel = 0; sel < ARRAY_SIZE(sel_rate); sel++) {
for (div = 128, idx = 0;
div <= 2048;
div *= 2, idx++) {
if (src_rate == sel_rate[sel] / div) {
val = (idx << 4) | sel;
goto find_rate;
}
}
}
dev_err(dev, "can't find convert src clk\n");
return -EINVAL;
find_rate:
shift = (id % 4) * 8;
mask = 0xFF << shift;
val = val << shift;
dev_dbg(dev, "adg convert src clk = %02x\n", val);
switch (id / 4) {
case 0:
rsnd_mod_bset(mod, AUDIO_CLK_SEL3, mask, val);
break;
case 1:
rsnd_mod_bset(mod, AUDIO_CLK_SEL4, mask, val);
break;
case 2:
rsnd_mod_bset(mod, AUDIO_CLK_SEL5, mask, val);
break;
}
/*
* Gen1 doesn't need dst_rate settings,
* since it uses SSI WS pin.
* see also rsnd_src_set_route_if_gen1()
*/
return 0;
}
static void rsnd_adg_set_ssi_clk(struct rsnd_mod *mod, u32 val)
{
int id = rsnd_mod_id(mod);
int shift = (id % 4) * 8;
u32 mask = 0xFF << shift;
val = val << shift;
/*
* SSI 8 is not connected to ADG.
* it works with SSI 7
*/
if (id == 8)
return;
switch (id / 4) {
case 0:
rsnd_mod_bset(mod, AUDIO_CLK_SEL0, mask, val);
break;
case 1:
rsnd_mod_bset(mod, AUDIO_CLK_SEL1, mask, val);
break;
case 2:
rsnd_mod_bset(mod, AUDIO_CLK_SEL2, mask, val);
break;
}
}
int rsnd_adg_ssi_clk_stop(struct rsnd_mod *mod)
{
/*
* "mod" = "ssi" here.
* we can get "ssi id" from mod
*/
rsnd_adg_set_ssi_clk(mod, 0);
return 0;
}
int rsnd_adg_ssi_clk_try_start(struct rsnd_mod *mod, unsigned int rate)
{
struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
struct device *dev = rsnd_priv_to_dev(priv);
struct clk *clk;
int i;
u32 data;
int sel_table[] = {
[CLKA] = 0x1,
[CLKB] = 0x2,
[CLKC] = 0x3,
[CLKI] = 0x0,
};
dev_dbg(dev, "request clock = %d\n", rate);
/*
* find suitable clock from
* AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC/AUDIO_CLKI.
*/
data = 0;
for_each_rsnd_clk(clk, adg, i) {
if (rate == clk_get_rate(clk)) {
data = sel_table[i];
goto found_clock;
}
}
/*
* find 1/6 clock from BRGA/BRGB
*/
if (rate == adg->rbga_rate_for_441khz_div_6) {
data = 0x10;
goto found_clock;
}
if (rate == adg->rbgb_rate_for_48khz_div_6) {
data = 0x20;
goto found_clock;
}
return -EIO;
found_clock:
/* see rsnd_adg_ssi_clk_init() */
rsnd_mod_bset(mod, SSICKR, 0x00FF0000, adg->ckr);
rsnd_mod_write(mod, BRRA, 0x00000002); /* 1/6 */
rsnd_mod_write(mod, BRRB, 0x00000002); /* 1/6 */
/*
* This "mod" = "ssi" here.
* we can get "ssi id" from mod
*/
rsnd_adg_set_ssi_clk(mod, data);
dev_dbg(dev, "ADG: ssi%d selects clk%d = %d",
rsnd_mod_id(mod), i, rate);
return 0;
}
static void rsnd_adg_ssi_clk_init(struct rsnd_priv *priv, struct rsnd_adg *adg)
{
struct clk *clk;
unsigned long rate;
u32 ckr;
int i;
int brg_table[] = {
[CLKA] = 0x0,
[CLKB] = 0x1,
[CLKC] = 0x4,
[CLKI] = 0x2,
};
/*
* This driver is assuming that AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC
* have 44.1kHz or 48kHz base clocks for now.
*
* SSI itself can divide parent clock by 1/1 - 1/16
* So, BRGA outputs 44.1kHz base parent clock 1/32,
* and, BRGB outputs 48.0kHz base parent clock 1/32 here.
* see
* rsnd_adg_ssi_clk_try_start()
*/
ckr = 0;
adg->rbga_rate_for_441khz_div_6 = 0;
adg->rbgb_rate_for_48khz_div_6 = 0;
for_each_rsnd_clk(clk, adg, i) {
rate = clk_get_rate(clk);
if (0 == rate) /* not used */
continue;
/* RBGA */
if (!adg->rbga_rate_for_441khz_div_6 && (0 == rate % 44100)) {
adg->rbga_rate_for_441khz_div_6 = rate / 6;
ckr |= brg_table[i] << 20;
}
/* RBGB */
if (!adg->rbgb_rate_for_48khz_div_6 && (0 == rate % 48000)) {
adg->rbgb_rate_for_48khz_div_6 = rate / 6;
ckr |= brg_table[i] << 16;
}
}
adg->ckr = ckr;
}
int rsnd_adg_probe(struct platform_device *pdev,
const struct rsnd_of_data *of_data,
struct rsnd_priv *priv)
{
struct rsnd_adg *adg;
struct device *dev = rsnd_priv_to_dev(priv);
struct clk *clk;
int i;
adg = devm_kzalloc(dev, sizeof(*adg), GFP_KERNEL);
if (!adg) {
dev_err(dev, "ADG allocate failed\n");
return -ENOMEM;
}
adg->clk[CLKA] = devm_clk_get(dev, "clk_a");
adg->clk[CLKB] = devm_clk_get(dev, "clk_b");
adg->clk[CLKC] = devm_clk_get(dev, "clk_c");
adg->clk[CLKI] = devm_clk_get(dev, "clk_i");
for_each_rsnd_clk(clk, adg, i)
dev_dbg(dev, "clk %d : %p : %ld\n", i, clk, clk_get_rate(clk));
rsnd_adg_ssi_clk_init(priv, adg);
priv->adg = adg;
dev_dbg(dev, "adg probed\n");
return 0;
}
