From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
This patch adds SRC support to Renesas sound driver. SRC converts sampling rate between codec <-> cpu. It needs special codec chip, or very simple DA/AD converter to use it. This patch was tested via ak4554 codec, and supports Gen1 only at this point.
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- include/sound/rcar_snd.h | 1 + sound/soc/sh/rcar/adg.c | 73 ++++++++++++++++++++++ sound/soc/sh/rcar/gen.c | 10 +++ sound/soc/sh/rcar/rsnd.h | 18 ++++++ sound/soc/sh/rcar/scu.c | 152 +++++++++++++++++++++++++++++++++++++++++++--- sound/soc/sh/rcar/ssi.c | 2 +- 6 files changed, 248 insertions(+), 8 deletions(-)
diff --git a/include/sound/rcar_snd.h b/include/sound/rcar_snd.h index 8f639e0..6add6cc 100644 --- a/include/sound/rcar_snd.h +++ b/include/sound/rcar_snd.h @@ -57,6 +57,7 @@ struct rsnd_ssi_platform_info {
struct rsnd_scu_platform_info { u32 flags; + u32 convert_rate; /* sampling rate convert */ };
/* diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c index 2e71a7b..a53235c 100644 --- a/sound/soc/sh/rcar/adg.c +++ b/sound/soc/sh/rcar/adg.c @@ -30,6 +30,79 @@ struct rsnd_adg { i++, (pos) = adg->clk[i]) #define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg)
+static 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; +} + +int rsnd_adg_set_convert_clk(struct rsnd_priv *priv, + struct rsnd_mod *mod, + unsigned int src_rate, + unsigned int dst_rate) +{ + if (rsnd_is_gen1(priv)) + return rsnd_adg_set_convert_clk_gen1(priv, mod, + src_rate, dst_rate); + + return -EINVAL; +} + static void rsnd_adg_set_ssi_clk(struct rsnd_mod *mod, u32 val) { int id = rsnd_mod_id(mod); diff --git a/sound/soc/sh/rcar/gen.c b/sound/soc/sh/rcar/gen.c index 862758d..add088b 100644 --- a/sound/soc/sh/rcar/gen.c +++ b/sound/soc/sh/rcar/gen.c @@ -318,13 +318,23 @@ static int rsnd_gen1_regmap_init(struct rsnd_priv *priv, struct rsnd_gen *gen) RSND_GEN1_S_REG(gen, SRU, SSI_MODE0, 0xD0), RSND_GEN1_S_REG(gen, SRU, SSI_MODE1, 0xD4), RSND_GEN1_M_REG(gen, SRU, BUSIF_MODE, 0x20, 0x4), + RSND_GEN1_M_REG(gen, SRU, SRC_ROUTE_MODE0,0x50, 0x8), + RSND_GEN1_M_REG(gen, SRU, SRC_SWRSR, 0x200, 0x40), + RSND_GEN1_M_REG(gen, SRU, SRC_SRCIR, 0x204, 0x40), RSND_GEN1_M_REG(gen, SRU, SRC_ADINR, 0x214, 0x40), + RSND_GEN1_M_REG(gen, SRU, SRC_IFSCR, 0x21c, 0x40), + RSND_GEN1_M_REG(gen, SRU, SRC_IFSVR, 0x220, 0x40), + RSND_GEN1_M_REG(gen, SRU, SRC_SRCCR, 0x224, 0x40), + RSND_GEN1_M_REG(gen, SRU, SRC_MNFSR, 0x228, 0x40),
RSND_GEN1_S_REG(gen, ADG, BRRA, 0x00), RSND_GEN1_S_REG(gen, ADG, BRRB, 0x04), RSND_GEN1_S_REG(gen, ADG, SSICKR, 0x08), RSND_GEN1_S_REG(gen, ADG, AUDIO_CLK_SEL0, 0x0c), RSND_GEN1_S_REG(gen, ADG, AUDIO_CLK_SEL1, 0x10), + RSND_GEN1_S_REG(gen, ADG, AUDIO_CLK_SEL3, 0x18), + RSND_GEN1_S_REG(gen, ADG, AUDIO_CLK_SEL4, 0x1c), + RSND_GEN1_S_REG(gen, ADG, AUDIO_CLK_SEL5, 0x20),
RSND_GEN1_M_REG(gen, SSI, SSICR, 0x00, 0x40), RSND_GEN1_M_REG(gen, SSI, SSISR, 0x04, 0x40), diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h index 3774dfc..4ca66cd 100644 --- a/sound/soc/sh/rcar/rsnd.h +++ b/sound/soc/sh/rcar/rsnd.h @@ -41,7 +41,14 @@ enum rsnd_reg { RSND_REG_SSI_MODE1, RSND_REG_BUSIF_MODE, RSND_REG_INT_ENABLE, /* for Gen2 */ + RSND_REG_SRC_ROUTE_MODE0, + RSND_REG_SRC_SWRSR, + RSND_REG_SRC_SRCIR, RSND_REG_SRC_ADINR, + RSND_REG_SRC_IFSCR, + RSND_REG_SRC_IFSVR, + RSND_REG_SRC_SRCCR, + RSND_REG_SRC_MNFSR,
/* ADG */ RSND_REG_BRRA, @@ -50,6 +57,9 @@ enum rsnd_reg { RSND_REG_AUDIO_CLK_SEL0, RSND_REG_AUDIO_CLK_SEL1, RSND_REG_AUDIO_CLK_SEL2, + RSND_REG_AUDIO_CLK_SEL3, /* for Gen1 */ + RSND_REG_AUDIO_CLK_SEL4, /* for Gen1 */ + RSND_REG_AUDIO_CLK_SEL5, /* for Gen1 */
/* SSI */ RSND_REG_SSICR, @@ -227,6 +237,10 @@ int rsnd_adg_probe(struct platform_device *pdev, struct rsnd_priv *priv); void rsnd_adg_remove(struct platform_device *pdev, struct rsnd_priv *priv); +int rsnd_adg_set_convert_clk(struct rsnd_priv *priv, + struct rsnd_mod *mod, + unsigned int src_rate, + unsigned int dst_rate);
/* * R-Car sound priv @@ -280,6 +294,10 @@ void rsnd_scu_remove(struct platform_device *pdev, struct rsnd_priv *priv); struct rsnd_mod *rsnd_scu_mod_get(struct rsnd_priv *priv, int id); bool rsnd_scu_hpbif_is_enable(struct rsnd_mod *mod); +unsigned int rsnd_scu_get_ssi_rate(struct rsnd_priv *priv, + struct rsnd_mod *ssi_mod, + struct snd_pcm_runtime *runtime); + #define rsnd_scu_nr(priv) ((priv)->scu_nr)
/* diff --git a/sound/soc/sh/rcar/scu.c b/sound/soc/sh/rcar/scu.c index fcc0a66..9bb08bb 100644 --- a/sound/soc/sh/rcar/scu.c +++ b/sound/soc/sh/rcar/scu.c @@ -13,9 +13,13 @@ struct rsnd_scu { struct rsnd_scu_platform_info *info; /* rcar_snd.h */ struct rsnd_mod mod; + struct clk *clk; };
#define rsnd_scu_mode_flags(p) ((p)->info->flags) +#define rsnd_scu_convert_rate(p) ((p)->info->convert_rate) + +#define RSND_SCU_NAME_SIZE 16
/* * ADINR @@ -26,6 +30,15 @@ struct rsnd_scu { #define OTBL_18 (6 << 16) #define OTBL_16 (8 << 16)
+/* + * image of SRC (Sampling Rate Converter) + * + * 96kHz <-> +-----+ 48kHz +-----+ 48kHz +-------+ + * 48kHz <-> | SRC | <------> | SSI | <-----> | codec | + * 44.1kHz <-> +-----+ +-----+ +-------+ + * ... + * + */
#define rsnd_mod_to_scu(_mod) \ container_of((_mod), struct rsnd_scu, mod) @@ -56,7 +69,7 @@ static int rsnd_src_set_route_if_gen1(struct rsnd_priv *priv, { 0x3, 28, }, /* 7 */ { 0x3, 30, }, /* 8 */ }; - + struct rsnd_scu *scu = rsnd_mod_to_scu(mod); u32 mask; u32 val; int shift; @@ -86,9 +99,18 @@ static int rsnd_src_set_route_if_gen1(struct rsnd_priv *priv, */ shift = (id % 4) * 8; mask = 0x1F << shift; - if (8 == id) /* SRU8 is very special */ + + /* + * ADG is used as source clock if SRC was used, + * then, SSI WS is used as destination clock. + * SSI WS is used as source clock if SRC is not used + * (when playback, source/destination become reverse when capture) + */ + if (rsnd_scu_convert_rate(scu)) /* use ADG */ + val = 0; + else if (8 == id) /* use SSI WS, but SRU8 is special */ val = id << shift; - else + else /* use SSI WS */ val = (id + 1) << shift;
switch (id / 4) { @@ -106,14 +128,45 @@ static int rsnd_src_set_route_if_gen1(struct rsnd_priv *priv, return 0; }
-static int rsnd_scu_rate_ctrl(struct rsnd_priv *priv, +unsigned int rsnd_scu_get_ssi_rate(struct rsnd_priv *priv, + struct rsnd_mod *ssi_mod, + struct snd_pcm_runtime *runtime) +{ + struct rsnd_scu *scu; + unsigned int rate; + + /* this function is assuming SSI id = SCU id here */ + scu = rsnd_mod_to_scu(rsnd_scu_mod_get(priv, rsnd_mod_id(ssi_mod))); + + /* + * return convert rate if SRC is used, + * otherwise, return runtime->rate as usual + */ + rate = rsnd_scu_convert_rate(scu); + if (!rate) + rate = runtime->rate; + + return rate; +} + +static int rsnd_scu_convert_rate_ctrl(struct rsnd_priv *priv, struct rsnd_mod *mod, struct rsnd_dai *rdai, struct rsnd_dai_stream *io) { struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); + struct rsnd_scu *scu = rsnd_mod_to_scu(mod); + u32 convert_rate = rsnd_scu_convert_rate(scu); u32 adinr = runtime->channels;
+ /* set/clear soft reset */ + rsnd_mod_write(mod, SRC_SWRSR, 0); + rsnd_mod_write(mod, SRC_SWRSR, 1); + + /* Initialize the operation of the SRC internal circuits */ + rsnd_mod_write(mod, SRC_SRCIR, 1); + + /* Set channel number and output bit length */ switch (runtime->sample_bits) { case 16: adinr |= OTBL_16; @@ -124,9 +177,42 @@ static int rsnd_scu_rate_ctrl(struct rsnd_priv *priv, default: return -EIO; } - rsnd_mod_write(mod, SRC_ADINR, adinr);
+ if (convert_rate) { + u32 fsrate = 0x0400000 / convert_rate * runtime->rate; + int ret; + + /* Enable the initial value of IFS */ + rsnd_mod_write(mod, SRC_IFSCR, 1); + + /* Set initial value of IFS */ + rsnd_mod_write(mod, SRC_IFSVR, fsrate); + + /* Select SRC mode (fixed value) */ + rsnd_mod_write(mod, SRC_SRCCR, 0x00010110); + + /* Set the restriction value of the FS ratio (98%) */ + rsnd_mod_write(mod, SRC_MNFSR, fsrate / 100 * 98); + + if (rsnd_is_gen1(priv)) { + /* no SRC_BFSSR settings, since SRC_SRCCR::BUFMD is 0 */ + } + + /* set convert clock */ + ret = rsnd_adg_set_convert_clk(priv, mod, + runtime->rate, + convert_rate); + if (ret < 0) + return ret; + } + + /* Cancel the initialization and operate the SRC function */ + rsnd_mod_write(mod, SRC_SRCIR, 0); + + /* use DMA transfer */ + rsnd_mod_write(mod, BUSIF_MODE, 1); + return 0; }
@@ -135,6 +221,7 @@ static int rsnd_scu_transfer_start(struct rsnd_priv *priv, struct rsnd_dai *rdai, struct rsnd_dai_stream *io) { + struct rsnd_scu *scu = rsnd_mod_to_scu(mod); int id = rsnd_mod_id(mod); u32 val;
@@ -143,7 +230,28 @@ static int rsnd_scu_transfer_start(struct rsnd_priv *priv, rsnd_mod_bset(mod, SRC_ROUTE_CTRL, val, val); }
- rsnd_mod_write(mod, BUSIF_MODE, 1); + if (rsnd_scu_convert_rate(scu)) + rsnd_mod_write(mod, SRC_ROUTE_MODE0, 1); + + return 0; +} + +static int rsnd_scu_transfer_stop(struct rsnd_priv *priv, + struct rsnd_mod *mod, + struct rsnd_dai *rdai, + struct rsnd_dai_stream *io) +{ + struct rsnd_scu *scu = rsnd_mod_to_scu(mod); + int id = rsnd_mod_id(mod); + u32 mask; + + if (rsnd_is_gen1(priv)) { + mask = (1 << id); + rsnd_mod_bset(mod, SRC_ROUTE_CTRL, mask, 0); + } + + if (rsnd_scu_convert_rate(scu)) + rsnd_mod_write(mod, SRC_ROUTE_MODE0, 0);
return 0; } @@ -161,6 +269,7 @@ static int rsnd_scu_start(struct rsnd_mod *mod, struct rsnd_dai_stream *io) { struct rsnd_priv *priv = rsnd_mod_to_priv(mod); + struct rsnd_scu *scu = rsnd_mod_to_scu(mod); struct device *dev = rsnd_priv_to_dev(priv); int ret;
@@ -175,13 +284,15 @@ static int rsnd_scu_start(struct rsnd_mod *mod, return 0; }
+ clk_enable(scu->clk); + /* it use DMA transter */
ret = rsnd_src_set_route_if_gen1(priv, mod, rdai, io); if (ret < 0) return ret;
- ret = rsnd_scu_rate_ctrl(priv, mod, rdai, io); + ret = rsnd_scu_convert_rate_ctrl(priv, mod, rdai, io); if (ret < 0) return ret;
@@ -194,9 +305,27 @@ static int rsnd_scu_start(struct rsnd_mod *mod, return 0; }
+static int rsnd_scu_stop(struct rsnd_mod *mod, + struct rsnd_dai *rdai, + struct rsnd_dai_stream *io) +{ + struct rsnd_priv *priv = rsnd_mod_to_priv(mod); + struct rsnd_scu *scu = rsnd_mod_to_scu(mod); + + if (!rsnd_scu_hpbif_is_enable(mod)) + return 0; + + rsnd_scu_transfer_stop(priv, mod, rdai, io); + + clk_disable(scu->clk); + + return 0; +} + static struct rsnd_mod_ops rsnd_scu_ops = { .name = "scu", .start = rsnd_scu_start, + .stop = rsnd_scu_stop, };
struct rsnd_mod *rsnd_scu_mod_get(struct rsnd_priv *priv, int id) @@ -213,6 +342,8 @@ int rsnd_scu_probe(struct platform_device *pdev, { struct device *dev = rsnd_priv_to_dev(priv); struct rsnd_scu *scu; + struct clk *clk; + char name[RSND_SCU_NAME_SIZE]; int i, nr;
/* @@ -229,9 +360,16 @@ int rsnd_scu_probe(struct platform_device *pdev, priv->scu = scu;
for_each_rsnd_scu(scu, priv, i) { + snprintf(name, RSND_SCU_NAME_SIZE, "scu.%d", i); + + clk = devm_clk_get(dev, name); + if (IS_ERR(clk)) + return PTR_ERR(clk); + rsnd_mod_init(priv, &scu->mod, &rsnd_scu_ops, i); scu->info = &info->scu_info[i]; + scu->clk = clk;
dev_dbg(dev, "SCU%d probed\n", i); } diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c index 846bb5e..4b8cf7c 100644 --- a/sound/soc/sh/rcar/ssi.c +++ b/sound/soc/sh/rcar/ssi.c @@ -200,7 +200,7 @@ static int rsnd_ssi_master_clk_start(struct rsnd_ssi *ssi, 1, 2, 4, 8, 16, 6, 12, }; unsigned int main_rate; - unsigned int rate = runtime->rate; + unsigned int rate = rsnd_scu_get_ssi_rate(priv, &ssi->mod, runtime);
/* * Find best clock, and try to start ADG