Document RZ/G2L ASoC serial sound interface bindings.

Signed-off-by: Biju Das biju.das.jz@bp.renesas.com Reviewed-by: Lad Prabhakar prabhakar.mahadev-lad.rj@bp.renesas.com --- v1->v2: * Rebased to latest mainline rc branch. --- .../bindings/sound/renesas,rz-ssi.yaml | 85 +++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/renesas,rz-ssi.yaml

diff --git a/Documentation/devicetree/bindings/sound/renesas,rz-ssi.yaml b/Documentation/devicetree/bindings/sound/renesas,rz-ssi.yaml new file mode 100644 index 000000000000..891f381ee5b8 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/renesas,rz-ssi.yaml @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/sound/renesas,rz-ssi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Renesas RZ/G2L ASoC Sound Serial Interface (SSIF-2) + +maintainers: + - Biju Das biju.das.jz@bp.renesas.com + +properties: + compatible: + items: + - enum: + - renesas,r9a07g044-ssi # RZ/G2{L,LC} + - const: renesas,rz-ssi + + reg: + maxItems: 1 + + interrupts: + maxItems: 4 + + interrupt-names: + items: + - const: int_req + - const: dma_rx + - const: dma_tx + - const: dma_rt + + clocks: + maxItems: 4 + + clock-names: + items: + - const: ssi + - const: ssi_sfr + - const: audio_clk1 + - const: audio_clk2 + + power-domains: + maxItems: 1 + + resets: + maxItems: 1 + + '#sound-dai-cells': + const: 0 + +required: + - compatible + - reg + - interrupts + - interrupt-names + - clocks + - clock-names + - resets + - '#sound-dai-cells' + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/clock/r9a07g044-cpg.h> + + ssi0: ssi@10049c00 { + compatible = "renesas,r9a07g044-ssi", + "renesas,rz-ssi"; + reg = <0x10049c00 0x400>; + interrupts = <GIC_SPI 326 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 327 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 328 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 329 IRQ_TYPE_EDGE_RISING>; + interrupt-names = "int_req", "dma_rx", "dma_tx", "dma_rt"; + clocks = <&cpg CPG_MOD R9A07G044_SSI0_PCLK2>, + <&cpg CPG_MOD R9A07G044_SSI0_PCLK_SFR>, + <&audio_clk1>, + <&audio_clk2>; + clock-names = "ssi", "ssi_sfr", "audio_clk1", "audio_clk2"; + power-domains = <&cpg>; + resets = <&cpg R9A07G044_SSI0_RST_M2_REG>; + #sound-dai-cells = <0>; + };

Add serial sound interface(SSIF-2) driver support for RZ/G2L SoC.

Based on the work done by Chris Brandt for RZ/A SSI driver.

Signed-off-by: Biju Das biju.das.jz@bp.renesas.com Reviewed-by: Lad Prabhakar prabhakar.mahadev-lad.rj@bp.renesas.com --- v1->v2: * No change --- sound/soc/sh/Kconfig | 10 + sound/soc/sh/Makefile | 4 + sound/soc/sh/rz-ssi.c | 875 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 889 insertions(+) create mode 100644 sound/soc/sh/rz-ssi.c

diff --git a/sound/soc/sh/Kconfig b/sound/soc/sh/Kconfig index 346c806ba390..8aa17f2f7c03 100644 --- a/sound/soc/sh/Kconfig +++ b/sound/soc/sh/Kconfig @@ -45,6 +45,16 @@ config SND_SOC_RCAR help This option enables R-Car SRU/SCU/SSIU/SSI sound support

+config SND_SOC_RZ + tristate "RZ/G2L series SSIF-2 support" + depends on OF || COMPILE_TEST + depends on ARCH_R9A07G044 + select SND_SIMPLE_CARD + help + This option enables ASoC sound support for the RZ/G2L MPUs. + The simple-audio-card driver and the RZ/G2L built-in serial + sound interface (SSIF-2) driver are used. + ## ## Boards ## diff --git a/sound/soc/sh/Makefile b/sound/soc/sh/Makefile index 51bd7c81671c..f6fd79948f6a 100644 --- a/sound/soc/sh/Makefile +++ b/sound/soc/sh/Makefile @@ -22,3 +22,7 @@ snd-soc-migor-objs := migor.o

obj-$(CONFIG_SND_SH7760_AC97) += snd-soc-sh7760-ac97.o obj-$(CONFIG_SND_SIU_MIGOR) += snd-soc-migor.o + +# RZ/G2L +snd-soc-rz-ssi-objs := rz-ssi.o +obj-$(CONFIG_SND_SOC_RZ) += snd-soc-rz-ssi.o diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c new file mode 100644 index 000000000000..51adddc406e7 --- /dev/null +++ b/sound/soc/sh/rz-ssi.c @@ -0,0 +1,875 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Renesas RZ/G2L Serial Sound Interface (SSIF-2) Driver + * + * Copyright (C) 2021 Renesas Electronics Corp. + * Copyright (C) 2019 Chris Brandt. + */ + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <sound/soc.h> + +/* REGISTER OFFSET */ +#define SSICR 0x000 +#define SSISR 0x004 +#define SSIFCR 0x010 +#define SSIFSR 0x014 +#define SSIFTDR 0x018 +#define SSIFRDR 0x01c +#define SSIOFR 0x020 +#define SSISCR 0x024 + +/* SSI REGISTER BITS */ +#define SSICR_DWL(x) (((x) & 0x7) << 19) +#define SSICR_SWL(x) (((x) & 0x7) << 16) +#define SSICR_MST BIT(14) +#define SSICR_CKDV(x) (((x) & 0xf) << 4) + +#define SSICR_CKS BIT(30) +#define SSICR_TUIEN BIT(29) +#define SSICR_TOIEN BIT(28) +#define SSICR_RUIEN BIT(27) +#define SSICR_ROIEN BIT(26) +#define SSICR_MST BIT(14) +#define SSICR_BCKP BIT(13) +#define SSICR_LRCKP BIT(12) +#define SSICR_CKDV(x) (((x) & 0xf) << 4) +#define SSICR_TEN BIT(1) +#define SSICR_REN BIT(0) + +#define SSISR_TUIRQ BIT(29) +#define SSISR_TOIRQ BIT(28) +#define SSISR_RUIRQ BIT(27) +#define SSISR_ROIRQ BIT(26) +#define SSISR_IIRQ BIT(25) + +#define SSIFCR_AUCKE BIT(31) +#define SSIFCR_SSIRST BIT(16) +#define SSIFCR_TIE BIT(3) +#define SSIFCR_RIE BIT(2) +#define SSIFCR_TFRST BIT(1) +#define SSIFCR_RFRST BIT(0) + +#define SSIFSR_TDC_MASK 0x3f +#define SSIFSR_TDC_SHIFT 24 +#define SSIFSR_RDC_MASK 0x3f +#define SSIFSR_RDC_SHIFT 8 + +#define SSIFSR_TDC(x) (((x) & 0x1f) << 24) +#define SSIFSR_TDE BIT(16) +#define SSIFSR_RDC(x) (((x) & 0x1f) << 8) +#define SSIFSR_RDF BIT(0) + +#define SSIOFR_LRCONT BIT(8) + +#define SSISCR_TDES(x) (((x) & 0x1f) << 8) +#define SSISCR_RDFS(x) (((x) & 0x1f) << 0) + +/* Pre allocated buffers sizes */ +#define PREALLOC_BUFFER (SZ_32K) +#define PREALLOC_BUFFER_MAX (SZ_32K) + +#define SSI_RATES SNDRV_PCM_RATE_8000_48000 /* 8k-44.1kHz */ +#define SSI_FMTS SNDRV_PCM_FMTBIT_S16_LE +#define SSI_CHAN_MIN 2 +#define SSI_CHAN_MAX 2 +#define SSI_FIFO_DEPTH 32 + +struct rz_ssi_priv; + +struct rz_ssi_stream { + struct rz_ssi_priv *priv; + struct snd_pcm_substream *substream; + int fifo_sample_size; /* sample capacity of SSI FIFO */ + int period_counter; /* for keeping track of periods transferred */ + int sample_width; + int buffer_pos; /* current frame position in the buffer */ + int running; /* 0=stopped, 1=running */ + + int uerr_num; + int oerr_num; + + int (*transfer)(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm); +}; + +struct rz_ssi_priv { + void __iomem *base; + struct platform_device *pdev; + struct reset_control *rstc; + struct device *dev; + struct clk *sfr_clk; + struct clk *clk; + + int irq_int; + int irq_tx; + int irq_rx; + + spinlock_t lock; + + /* + * The SSI supports full-duplex transmission and reception. + * However, if an error occurs, channel reset (both transmission + * and reception reset) is required. + * So it is better to use as half-duplex (playing and recording + * should be done on separate channels). + */ + struct rz_ssi_stream playback; + struct rz_ssi_stream capture; + + /* clock */ + unsigned long audio_mck; + unsigned long audio_clk_1; + unsigned long audio_clk_2; + + bool lrckp_fsync_fall; /* LR clock polarity (SSICR.LRCKP) */ + bool bckp_rise; /* Bit clock polarity (SSICR.BCKP) */ +}; + +static void rz_ssi_reg_writel(struct rz_ssi_priv *priv, uint reg, u32 data) +{ + writel(data, (priv->base + reg)); +} + +static u32 rz_ssi_reg_readl(struct rz_ssi_priv *priv, uint reg) +{ + return readl(priv->base + reg); +} + +static void rz_ssi_reg_mask_setl(struct rz_ssi_priv __iomem *priv, uint reg, + u32 bclr, u32 bset) +{ + u32 val; + + val = readl(priv->base + reg); + val = (val & ~bclr) | bset; + writel(val, (priv->base + reg)); +} + +static inline struct snd_soc_dai * +rz_ssi_get_dai(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + + return asoc_rtd_to_cpu(rtd, 0); +} + +static inline bool rz_ssi_stream_is_play(struct rz_ssi_priv *ssi, + struct rz_ssi_stream *strm) +{ + return strm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK; +} + +static inline struct rz_ssi_stream * +rz_ssi_stream_get(struct rz_ssi_priv *ssi, struct snd_pcm_substream *substream) +{ + struct rz_ssi_stream *stream = &ssi->playback; + + if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) + stream = &ssi->capture; + + return stream; +} + +static int rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi, + struct rz_ssi_stream *strm) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&ssi->lock, flags); + ret = !!(strm->substream && strm->substream->runtime); + spin_unlock_irqrestore(&ssi->lock, flags); + + return ret; +} + +static int rz_ssi_stream_init(struct rz_ssi_priv *ssi, + struct rz_ssi_stream *strm, + struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + strm->substream = substream; + + strm->sample_width = samples_to_bytes(runtime, 1); + strm->period_counter = 0; + strm->buffer_pos = 0; + + strm->oerr_num = 0; + strm->uerr_num = 0; + strm->running = 0; + + /* fifo init */ + strm->fifo_sample_size = SSI_FIFO_DEPTH; + + if (runtime->sample_bits != 16) { + dev_err(ssi->dev, "Unsupported sample width: %d\n", + runtime->sample_bits); + strm->substream = NULL; + return -EINVAL; + } + + if (runtime->frame_bits != 32) { + dev_err(ssi->dev, "Unsupported frame width: %d\n", + runtime->sample_bits); + strm->substream = NULL; + return -EINVAL; + } + + if (runtime->channels != 2) { + dev_err(ssi->dev, "Number of channels not matched\n"); + strm->substream = NULL; + return -EINVAL; + } + + return 0; +} + +static void rz_ssi_stream_quit(struct rz_ssi_priv *ssi, + struct rz_ssi_stream *strm) +{ + struct snd_soc_dai *dai = rz_ssi_get_dai(strm->substream); + unsigned long flags; + + if (strm->oerr_num > 0) + dev_info(dai->dev, "overrun = %d\n", strm->oerr_num); + + if (strm->uerr_num > 0) + dev_info(dai->dev, "underrun = %d\n", strm->uerr_num); + + spin_lock_irqsave(&ssi->lock, flags); + strm->substream = NULL; + spin_unlock_irqrestore(&ssi->lock, flags); +} + +static int rz_ssi_clk_setup(struct rz_ssi_priv *ssi, unsigned int rate, + unsigned int channels) +{ + static s8 ckdv[16] = { 1, 2, 4, 8, 16, 32, 64, 128, + 6, 12, 24, 48, 96, -1, -1, -1 }; + unsigned int channel_bits = 32; /* System Word Length */ + unsigned long bclk_rate = rate * channels * channel_bits; + unsigned int div; + u32 ssicr = 0; + u32 clk_ckdv; + int i; + + /* Clear AUCKE so we can set MST */ + rz_ssi_reg_writel(ssi, SSIFCR, 0); + + /* Continue to output LRCK pin even when idle */ + rz_ssi_reg_writel(ssi, SSIOFR, SSIOFR_LRCONT); + if (ssi->audio_clk_1 && ssi->audio_clk_2) { + if (ssi->audio_clk_1 % bclk_rate) + ssi->audio_mck = ssi->audio_clk_2; + else + ssi->audio_mck = ssi->audio_clk_1; + } + + /* Clock setting */ + ssicr |= SSICR_MST; + if (ssi->audio_mck == ssi->audio_clk_1) + ssicr |= SSICR_CKS; + if (ssi->bckp_rise) + ssicr |= SSICR_BCKP; + if (ssi->lrckp_fsync_fall) + ssicr |= SSICR_LRCKP; + + /* Determine the clock divider */ + clk_ckdv = 0; + div = ssi->audio_mck / bclk_rate; + /* try to find an match */ + for (i = 0; i < ARRAY_SIZE(ckdv); i++) { + if (ckdv[i] == div) { + clk_ckdv = i; + break; + } + } + + if (i == ARRAY_SIZE(ckdv)) { + dev_err(ssi->dev, "Rate not divisible by audio clock source\n"); + return -EINVAL; + } + + /* + * DWL: Data Word Length = 16 bits + * SWL: System Word Length = 32 bits + */ + ssicr |= SSICR_CKDV(clk_ckdv); + ssicr |= SSICR_DWL(1) | SSICR_SWL(3); + rz_ssi_reg_writel(ssi, SSICR, ssicr); + rz_ssi_reg_writel(ssi, SSIFCR, + (SSIFCR_AUCKE | SSIFCR_TFRST | SSIFCR_RFRST)); + + return 0; +} + +static int rz_ssi_start_stop(struct rz_ssi_priv *ssi, + struct rz_ssi_stream *strm, + int start) +{ + u32 ssicr, ssifcr; + int timeout; + + if (start) { + ssicr = rz_ssi_reg_readl(ssi, SSICR); + ssifcr = rz_ssi_reg_readl(ssi, SSIFCR) & ~0xF; + + /* FIFO interrupt thresholds */ + rz_ssi_reg_writel(ssi, SSISCR, + SSISCR_TDES(strm->fifo_sample_size / 2 - 1) | + SSISCR_RDFS(0)); + + /* enable IRQ */ + if (rz_ssi_stream_is_play(ssi, strm)) { + ssicr |= SSICR_TUIEN | SSICR_TOIEN; + ssifcr |= SSIFCR_TIE | SSIFCR_RFRST; + } else { + ssicr |= SSICR_RUIEN | SSICR_ROIEN; + ssifcr |= SSIFCR_RIE | SSIFCR_TFRST; + } + + rz_ssi_reg_writel(ssi, SSICR, ssicr); + rz_ssi_reg_writel(ssi, SSIFCR, ssifcr); + + /* Clear all error flags */ + rz_ssi_reg_mask_setl(ssi, SSISR, + (SSISR_TOIRQ | SSISR_TUIRQ | SSISR_ROIRQ | + SSISR_RUIRQ), 0); + + strm->running = 1; + ssicr |= rz_ssi_stream_is_play(ssi, strm) ? SSICR_TEN : SSICR_REN; + rz_ssi_reg_writel(ssi, SSICR, ssicr); + + } else { + strm->running = 0; + + /* Disable irqs */ + rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TUIEN | SSICR_TOIEN | + SSICR_RUIEN | SSICR_ROIEN, 0); + rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_TIE | SSIFCR_RIE, 0); + + /* Clear all error flags */ + rz_ssi_reg_mask_setl(ssi, SSISR, + (SSISR_TOIRQ | SSISR_TUIRQ | SSISR_ROIRQ | + SSISR_RUIRQ), 0); + + /* Wait for idle */ + timeout = 100; + while (--timeout) { + if (rz_ssi_reg_readl(ssi, SSISR) | SSISR_IIRQ) + break; + udelay(1); + } + + if (!timeout) + dev_info(ssi->dev, "timeout waiting for SSI idle\n"); + + /* Disable TX/RX */ + rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0); + + /* Hold FIFOs in reset */ + rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, + SSIFCR_TFRST | SSIFCR_RFRST); + } + + return 0; +} + +static void rz_ssi_pointer_update(struct rz_ssi_stream *strm, int frames) +{ + struct snd_pcm_runtime *runtime = strm->substream->runtime; + int current_period; + + strm->buffer_pos += frames; + WARN_ON(strm->buffer_pos > runtime->buffer_size); + + /* ring buffer */ + if (strm->buffer_pos == runtime->buffer_size) + strm->buffer_pos = 0; + + current_period = strm->buffer_pos / runtime->period_size; + if (strm->period_counter != current_period) { + snd_pcm_period_elapsed(strm->substream); + strm->period_counter = current_period; + } +} + +static int rz_ssi_pio_recv(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) +{ + struct snd_pcm_substream *substream = strm->substream; + struct snd_pcm_runtime *runtime = substream->runtime; + u16 *buf; + int fifo_samples; + int frames_left; + int samples = 0; + int i; + + if (!rz_ssi_stream_is_valid(ssi, strm)) + return -EINVAL; + + /* frames left in this period */ + frames_left = runtime->period_size - (strm->buffer_pos % + runtime->period_size); + if (frames_left == 0) + frames_left = runtime->period_size; + + /* Samples in RX FIFO */ + fifo_samples = (rz_ssi_reg_readl(ssi, SSIFSR) >> + SSIFSR_RDC_SHIFT) & SSIFSR_RDC_MASK; + + /* Only read full frames at a time */ + while (frames_left && (fifo_samples >= runtime->channels)) { + samples += runtime->channels; + fifo_samples -= runtime->channels; + frames_left--; + } + + /* not enough samples yet */ + if (samples == 0) + return 0; + + /* calculate new buffer index */ + buf = (u16 *)(strm->substream->runtime->dma_area); + buf += strm->buffer_pos * runtime->channels; + + /* Note, only supports 16-bit samples */ + for (i = 0; i < samples; i++) + *buf++ = (u16)(rz_ssi_reg_readl(ssi, SSIFRDR) >> 16); + + rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0); + rz_ssi_pointer_update(strm, samples / runtime->channels); + + /* + * If we finished this period, but there are more samples in + * the RX FIFO, call this function again + */ + if (frames_left == 0 && fifo_samples >= runtime->channels) + rz_ssi_pio_recv(ssi, strm); + + return 0; +} + +static int rz_ssi_pio_send(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) +{ + struct snd_pcm_substream *substream = strm->substream; + struct snd_pcm_runtime *runtime = substream->runtime; + int sample_space; + int samples = 0; + int frames_left; + int i; + u32 ssifsr; + u16 *buf; + + if (!rz_ssi_stream_is_valid(ssi, strm)) + return -EINVAL; + + /* frames left in this period */ + frames_left = runtime->period_size - (strm->buffer_pos % + runtime->period_size); + if (frames_left == 0) + frames_left = runtime->period_size; + + sample_space = strm->fifo_sample_size; + ssifsr = rz_ssi_reg_readl(ssi, SSIFSR); + sample_space -= (ssifsr >> SSIFSR_TDC_SHIFT) & SSIFSR_TDC_MASK; + + /* Only add full frames at a time */ + while (frames_left && (sample_space >= runtime->channels)) { + samples += runtime->channels; + sample_space -= runtime->channels; + frames_left--; + } + + /* no space to send anything right now */ + if (samples == 0) + return 0; + + /* calculate new buffer index */ + buf = (u16 *)(strm->substream->runtime->dma_area); + buf += strm->buffer_pos * runtime->channels; + + /* Note, only supports 16-bit samples */ + for (i = 0; i < samples; i++) + rz_ssi_reg_writel(ssi, SSIFTDR, ((u32)(*buf++) << 16)); + + rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_TDE, 0); + rz_ssi_pointer_update(strm, samples / runtime->channels); + + return 0; +} + +static irqreturn_t rz_ssi_interrupt(int irq, void *data) +{ + struct rz_ssi_stream *strm = NULL; + struct rz_ssi_priv *ssi = data; + u32 ssisr = rz_ssi_reg_readl(ssi, SSISR); + + if (ssi->playback.substream) + strm = &ssi->playback; + else if (ssi->capture.substream) + strm = &ssi->capture; + else + return IRQ_HANDLED; /* Left over TX/RX interrupt */ + + if (irq == ssi->irq_int) { /* error or idle */ + if (ssisr & SSISR_TUIRQ) + strm->uerr_num++; + if (ssisr & SSISR_TOIRQ) + strm->oerr_num++; + if (ssisr & SSISR_RUIRQ) + strm->uerr_num++; + if (ssisr & SSISR_ROIRQ) + strm->oerr_num++; + + if (ssisr & (SSISR_TUIRQ | SSISR_TOIRQ | SSISR_RUIRQ | + SSISR_ROIRQ)) { + /* Error handling */ + /* You must reset (stop/restart) after each interrupt */ + rz_ssi_start_stop(ssi, strm, 0); + + /* Clear all flags */ + rz_ssi_reg_mask_setl(ssi, SSISR, SSISR_TOIRQ | + SSISR_TUIRQ | SSISR_ROIRQ | + SSISR_RUIRQ, 0); + + /* Add/remove more data */ + strm->transfer(ssi, strm); + + /* Resume */ + rz_ssi_start_stop(ssi, strm, 1); + } + } + + if (!strm->running) + return IRQ_HANDLED; + + /* tx data empty */ + if (irq == ssi->irq_tx) + strm->transfer(ssi, &ssi->playback); + + /* rx data full */ + if (irq == ssi->irq_rx) { + strm->transfer(ssi, &ssi->capture); + rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0); + } + + return IRQ_HANDLED; +} + +static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai); + struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream); + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + /* Soft Reset */ + rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, SSIFCR_SSIRST); + rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0); + udelay(5); + + ret = rz_ssi_stream_init(ssi, strm, substream); + if (ret) + goto done; + + ret = strm->transfer(ssi, strm); + if (ret) + goto done; + + ret = rz_ssi_start_stop(ssi, strm, 1); + break; + case SNDRV_PCM_TRIGGER_STOP: + rz_ssi_start_stop(ssi, strm, 0); + rz_ssi_stream_quit(ssi, strm); + break; + } + +done: + return ret; +} + +static int rz_ssi_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai); + + /* set master/slave audio interface */ + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBS_CFS: + asm("nop"); /* codec is slave */ + break; + default: + dev_err(ssi->dev, "Only master mode is supported.\n"); + return -EINVAL; + } + + /* + * set clock polarity + * + * "normal" BCLK = Signal is available at rising edge of BCLK + * "normal" FSYNC = (I2S) Left ch starts with falling FSYNC edge + */ + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + ssi->bckp_rise = false; + ssi->lrckp_fsync_fall = false; + break; + case SND_SOC_DAIFMT_NB_IF: + ssi->bckp_rise = false; + ssi->lrckp_fsync_fall = true; + break; + case SND_SOC_DAIFMT_IB_NF: + ssi->bckp_rise = true; + ssi->lrckp_fsync_fall = false; + break; + case SND_SOC_DAIFMT_IB_IF: + ssi->bckp_rise = true; + ssi->lrckp_fsync_fall = true; + break; + default: + return -EINVAL; + } + + /* only i2s support */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + break; + default: + dev_err(ssi->dev, "Only I2S mode is supported.\n"); + return -EINVAL; + } + + return 0; +} + +static int rz_ssi_dai_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai); + + return rz_ssi_clk_setup(ssi, params_rate(params), + params_channels(params)); +} + +static const struct snd_soc_dai_ops rz_ssi_dai_ops = { + .trigger = rz_ssi_dai_trigger, + .set_fmt = rz_ssi_dai_set_fmt, + .hw_params = rz_ssi_dai_hw_params, +}; + +static const struct snd_pcm_hardware rz_ssi_pcm_hardware = { + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID, + .buffer_bytes_max = PREALLOC_BUFFER, + .period_bytes_min = 32, + .period_bytes_max = 8192, + .channels_min = SSI_CHAN_MIN, + .channels_max = SSI_CHAN_MAX, + .periods_min = 1, + .periods_max = 32, + .fifo_size = 32 * 2, +}; + +static int rz_ssi_pcm_open(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + snd_soc_set_runtime_hwparams(substream, &rz_ssi_pcm_hardware); + + return snd_pcm_hw_constraint_integer(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIODS); +} + +static snd_pcm_uframes_t rz_ssi_pcm_pointer(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_dai *dai = rz_ssi_get_dai(substream); + struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai); + struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream); + + return strm->buffer_pos; +} + +static int rz_ssi_pcm_new(struct snd_soc_component *component, + struct snd_soc_pcm_runtime *rtd) +{ + snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, + rtd->card->snd_card->dev, + PREALLOC_BUFFER, PREALLOC_BUFFER_MAX); + return 0; +} + +static struct snd_soc_dai_driver rz_ssi_soc_dai[] = { + { + .name = "rz-ssi-dai", + .playback = { + .rates = SSI_RATES, + .formats = SSI_FMTS, + .channels_min = SSI_CHAN_MIN, + .channels_max = SSI_CHAN_MAX, + }, + .capture = { + .rates = SSI_RATES, + .formats = SSI_FMTS, + .channels_min = SSI_CHAN_MIN, + .channels_max = SSI_CHAN_MAX, + }, + .ops = &rz_ssi_dai_ops, + }, +}; + +static const struct snd_soc_component_driver rz_ssi_soc_component = { + .name = "rz-ssi", + .open = rz_ssi_pcm_open, + .pointer = rz_ssi_pcm_pointer, + .pcm_construct = rz_ssi_pcm_new, +}; + +static int rz_ssi_probe(struct platform_device *pdev) +{ + struct rz_ssi_priv *ssi; + struct clk *audio_clk; + int ret = 0; + + ssi = devm_kzalloc(&pdev->dev, sizeof(*ssi), GFP_KERNEL); + if (!ssi) + return -ENOMEM; + + ssi->pdev = pdev; + ssi->dev = &pdev->dev; + ssi->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(ssi->base)) + return PTR_ERR(ssi->base); + + ssi->clk = devm_clk_get(&pdev->dev, "ssi"); + if (IS_ERR(ssi->clk)) + return PTR_ERR(ssi->clk); + + ssi->sfr_clk = devm_clk_get(&pdev->dev, "ssi_sfr"); + if (IS_ERR(ssi->sfr_clk)) + return PTR_ERR(ssi->sfr_clk); + + audio_clk = devm_clk_get(&pdev->dev, "audio_clk1"); + if (IS_ERR(audio_clk)) { + ret |= PTR_ERR(audio_clk); + ssi->audio_clk_1 = 0; + } else { + ssi->audio_clk_1 = clk_get_rate(audio_clk); + } + + audio_clk = devm_clk_get(&pdev->dev, "audio_clk2"); + if (IS_ERR(audio_clk)) { + ret |= PTR_ERR(audio_clk); + ssi->audio_clk_2 = 0; + } else { + ssi->audio_clk_2 = clk_get_rate(audio_clk); + } + + if (!(ssi->audio_clk_1 || ssi->audio_clk_2)) + return dev_err_probe(&pdev->dev, ret, + "no audio clk1 or audio clk2"); + + ssi->audio_mck = ssi->audio_clk_1 ? ssi->audio_clk_1 : ssi->audio_clk_2; + + /* Error Interrupt */ + ssi->irq_int = platform_get_irq_byname(pdev, "int_req"); + if (ssi->irq_int < 0) + return dev_err_probe(&pdev->dev, -ENODEV, + "Unable to get SSI int_req IRQ\n"); + + ret = devm_request_irq(&pdev->dev, ssi->irq_int, &rz_ssi_interrupt, + 0, dev_name(&pdev->dev), ssi); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, + "irq request error (int_req)\n"); + + /* Tx and Rx interrupts (pio only) */ + ssi->irq_tx = platform_get_irq_byname(pdev, "dma_tx"); + if (ssi->irq_tx < 0) + return dev_err_probe(&pdev->dev, -ENODEV, + "Unable to get SSI dma_tx IRQ\n"); + + ret = devm_request_irq(&pdev->dev, ssi->irq_tx, &rz_ssi_interrupt, 0, + dev_name(&pdev->dev), ssi); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, + "irq request error (dma_tx)\n"); + + ssi->irq_rx = platform_get_irq_byname(pdev, "dma_rx"); + if (ssi->irq_rx < 0) + return dev_err_probe(&pdev->dev, -ENODEV, + "Unable to get SSI dma_rx IRQ\n"); + + ret = devm_request_irq(&pdev->dev, ssi->irq_rx, &rz_ssi_interrupt, 0, + dev_name(&pdev->dev), ssi); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, + "irq request error (dma_rx)\n"); + + ssi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(ssi->rstc)) + return PTR_ERR(ssi->rstc); + + reset_control_deassert(ssi->rstc); + pm_runtime_enable(&pdev->dev); + pm_runtime_resume_and_get(&pdev->dev); + + ssi->playback.transfer = rz_ssi_pio_send; + ssi->capture.transfer = rz_ssi_pio_recv; + ssi->playback.priv = ssi; + ssi->capture.priv = ssi; + + spin_lock_init(&ssi->lock); + dev_set_drvdata(&pdev->dev, ssi); + ret = devm_snd_soc_register_component(&pdev->dev, &rz_ssi_soc_component, + rz_ssi_soc_dai, + ARRAY_SIZE(rz_ssi_soc_dai)); + if (ret < 0) { + pm_runtime_put(ssi->dev); + pm_runtime_disable(ssi->dev); + reset_control_assert(ssi->rstc); + dev_err(&pdev->dev, "failed to register snd component\n"); + } + + return ret; +} + +static int rz_ssi_remove(struct platform_device *pdev) +{ + struct rz_ssi_priv *ssi = dev_get_drvdata(&pdev->dev); + + pm_runtime_put(ssi->dev); + pm_runtime_disable(ssi->dev); + reset_control_assert(ssi->rstc); + + return 0; +} + +static const struct of_device_id rz_ssi_of_match[] = { + { .compatible = "renesas,rz-ssi", }, + {/* Sentinel */}, +}; +MODULE_DEVICE_TABLE(of, rz_ssi_of_match); + +static struct platform_driver rz_ssi_driver = { + .driver = { + .name = "rz-ssi-pcm-audio", + .of_match_table = rz_ssi_of_match, + }, + .probe = rz_ssi_probe, + .remove = rz_ssi_remove, +}; + +module_platform_driver(rz_ssi_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Renesas RZ/G2L ASoC serial sound interface driver"); +MODULE_AUTHOR("Biju Das biju.das.jz@bp.renesas.com");