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-rw-r--r--sound/soc/sh/rz-ssi.c1085
1 files changed, 1085 insertions, 0 deletions
diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c
new file mode 100644
index 000000000..5d6bae33a
--- /dev/null
+++ b/sound/soc/sh/rz-ssi.c
@@ -0,0 +1,1085 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Renesas RZ/G2L ASoC Serial Sound Interface (SSIF-2) Driver
+//
+// Copyright (C) 2021 Renesas Electronics Corp.
+// Copyright (C) 2019 Chris Brandt.
+//
+
+#include <linux/clk.h>
+#include <linux/dmaengine.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_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_TDE BIT(16)
+#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 dma_buffer_pos; /* The address for the next DMA descriptor */
+ 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;
+
+ struct dma_chan *dma_ch;
+
+ 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;
+
+ phys_addr_t phys;
+ 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) */
+ bool dma_rt;
+};
+
+static void rz_ssi_dma_complete(void *data);
+
+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 *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 snd_pcm_substream *substream)
+{
+ return 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 inline bool rz_ssi_is_dma_enabled(struct rz_ssi_priv *ssi)
+{
+ return (ssi->playback.dma_ch && (ssi->dma_rt || ssi->capture.dma_ch));
+}
+
+static void rz_ssi_set_substream(struct rz_ssi_stream *strm,
+ struct snd_pcm_substream *substream)
+{
+ struct rz_ssi_priv *ssi = strm->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ssi->lock, flags);
+ strm->substream = substream;
+ spin_unlock_irqrestore(&ssi->lock, flags);
+}
+
+static bool rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi,
+ struct rz_ssi_stream *strm)
+{
+ unsigned long flags;
+ bool ret;
+
+ spin_lock_irqsave(&ssi->lock, flags);
+ ret = strm->substream && strm->substream->runtime;
+ spin_unlock_irqrestore(&ssi->lock, flags);
+
+ return ret;
+}
+
+static void rz_ssi_stream_init(struct rz_ssi_stream *strm,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ rz_ssi_set_substream(strm, substream);
+ strm->sample_width = samples_to_bytes(runtime, 1);
+ strm->dma_buffer_pos = 0;
+ 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;
+}
+
+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);
+
+ rz_ssi_set_substream(strm, NULL);
+
+ 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);
+}
+
+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;
+ unsigned int i;
+ u32 ssicr = 0;
+ u32 clk_ckdv;
+
+ /* 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(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
+{
+ bool is_play = rz_ssi_stream_is_play(ssi, strm->substream);
+ u32 ssicr, ssifcr;
+
+ ssicr = rz_ssi_reg_readl(ssi, SSICR);
+ ssifcr = rz_ssi_reg_readl(ssi, SSIFCR) & ~0xF;
+
+ /* FIFO interrupt thresholds */
+ if (rz_ssi_is_dma_enabled(ssi))
+ rz_ssi_reg_writel(ssi, SSISCR, 0);
+ else
+ rz_ssi_reg_writel(ssi, SSISCR,
+ SSISCR_TDES(strm->fifo_sample_size / 2 - 1) |
+ SSISCR_RDFS(0));
+
+ /* enable IRQ */
+ if (is_play) {
+ 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 |= is_play ? SSICR_TEN : SSICR_REN;
+ rz_ssi_reg_writel(ssi, SSICR, ssicr);
+
+ return 0;
+}
+
+static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
+{
+ int timeout;
+
+ strm->running = 0;
+
+ /* Disable TX/RX */
+ rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0);
+
+ /* Cancel all remaining DMA transactions */
+ if (rz_ssi_is_dma_enabled(ssi))
+ dmaengine_terminate_async(strm->dma_ch);
+
+ /* 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");
+
+ /* 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_substream *substream = strm->substream;
+ struct snd_pcm_runtime *runtime;
+ int current_period;
+
+ if (!strm->running || !substream || !substream->runtime)
+ return;
+
+ runtime = substream->runtime;
+ 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;
+ u16 *buf;
+ int fifo_samples;
+ int frames_left;
+ int samples;
+ int i;
+
+ if (!rz_ssi_stream_is_valid(ssi, strm))
+ return -EINVAL;
+
+ runtime = substream->runtime;
+
+ do {
+ /* frames left in this period */
+ frames_left = runtime->period_size -
+ (strm->buffer_pos % runtime->period_size);
+ if (!frames_left)
+ 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 */
+ samples = 0;
+ while (frames_left && (fifo_samples >= runtime->channels)) {
+ samples += runtime->channels;
+ fifo_samples -= runtime->channels;
+ frames_left--;
+ }
+
+ /* not enough samples yet */
+ if (!samples)
+ break;
+
+ /* calculate new buffer index */
+ buf = (u16 *)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);
+ } while (!frames_left && fifo_samples >= runtime->channels);
+
+ 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 *)(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_stop(ssi, strm);
+
+ /* 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(ssi, strm);
+ }
+ }
+
+ 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_dma_slave_config(struct rz_ssi_priv *ssi,
+ struct dma_chan *dma_ch, bool is_play)
+{
+ struct dma_slave_config cfg;
+
+ memset(&cfg, 0, sizeof(cfg));
+
+ cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+ cfg.dst_addr = ssi->phys + SSIFTDR;
+ cfg.src_addr = ssi->phys + SSIFRDR;
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+
+ return dmaengine_slave_config(dma_ch, &cfg);
+}
+
+static int rz_ssi_dma_transfer(struct rz_ssi_priv *ssi,
+ struct rz_ssi_stream *strm)
+{
+ struct snd_pcm_substream *substream = strm->substream;
+ struct dma_async_tx_descriptor *desc;
+ struct snd_pcm_runtime *runtime;
+ enum dma_transfer_direction dir;
+ u32 dma_paddr, dma_size;
+ int amount;
+
+ if (!rz_ssi_stream_is_valid(ssi, strm))
+ return -EINVAL;
+
+ runtime = substream->runtime;
+ if (runtime->state == SNDRV_PCM_STATE_DRAINING)
+ /*
+ * Stream is ending, so do not queue up any more DMA
+ * transfers otherwise we play partial sound clips
+ * because we can't shut off the DMA quick enough.
+ */
+ return 0;
+
+ dir = rz_ssi_stream_is_play(ssi, substream) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+
+ /* Always transfer 1 period */
+ amount = runtime->period_size;
+
+ /* DMA physical address and size */
+ dma_paddr = runtime->dma_addr + frames_to_bytes(runtime,
+ strm->dma_buffer_pos);
+ dma_size = frames_to_bytes(runtime, amount);
+ desc = dmaengine_prep_slave_single(strm->dma_ch, dma_paddr, dma_size,
+ dir,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc) {
+ dev_err(ssi->dev, "dmaengine_prep_slave_single() fail\n");
+ return -ENOMEM;
+ }
+
+ desc->callback = rz_ssi_dma_complete;
+ desc->callback_param = strm;
+
+ if (dmaengine_submit(desc) < 0) {
+ dev_err(ssi->dev, "dmaengine_submit() fail\n");
+ return -EIO;
+ }
+
+ /* Update DMA pointer */
+ strm->dma_buffer_pos += amount;
+ if (strm->dma_buffer_pos >= runtime->buffer_size)
+ strm->dma_buffer_pos = 0;
+
+ /* Start DMA */
+ dma_async_issue_pending(strm->dma_ch);
+
+ return 0;
+}
+
+static void rz_ssi_dma_complete(void *data)
+{
+ struct rz_ssi_stream *strm = (struct rz_ssi_stream *)data;
+
+ if (!strm->running || !strm->substream || !strm->substream->runtime)
+ return;
+
+ /* Note that next DMA transaction has probably already started */
+ rz_ssi_pointer_update(strm, strm->substream->runtime->period_size);
+
+ /* Queue up another DMA transaction */
+ rz_ssi_dma_transfer(strm->priv, strm);
+}
+
+static void rz_ssi_release_dma_channels(struct rz_ssi_priv *ssi)
+{
+ if (ssi->playback.dma_ch) {
+ dma_release_channel(ssi->playback.dma_ch);
+ ssi->playback.dma_ch = NULL;
+ if (ssi->dma_rt)
+ ssi->dma_rt = false;
+ }
+
+ if (ssi->capture.dma_ch) {
+ dma_release_channel(ssi->capture.dma_ch);
+ ssi->capture.dma_ch = NULL;
+ }
+}
+
+static int rz_ssi_dma_request(struct rz_ssi_priv *ssi, struct device *dev)
+{
+ ssi->playback.dma_ch = dma_request_chan(dev, "tx");
+ if (IS_ERR(ssi->playback.dma_ch))
+ ssi->playback.dma_ch = NULL;
+
+ ssi->capture.dma_ch = dma_request_chan(dev, "rx");
+ if (IS_ERR(ssi->capture.dma_ch))
+ ssi->capture.dma_ch = NULL;
+
+ if (!ssi->playback.dma_ch && !ssi->capture.dma_ch) {
+ ssi->playback.dma_ch = dma_request_chan(dev, "rt");
+ if (IS_ERR(ssi->playback.dma_ch)) {
+ ssi->playback.dma_ch = NULL;
+ goto no_dma;
+ }
+
+ ssi->dma_rt = true;
+ }
+
+ if (!rz_ssi_is_dma_enabled(ssi))
+ goto no_dma;
+
+ if (ssi->playback.dma_ch &&
+ (rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch, true) < 0))
+ goto no_dma;
+
+ if (ssi->capture.dma_ch &&
+ (rz_ssi_dma_slave_config(ssi, ssi->capture.dma_ch, false) < 0))
+ goto no_dma;
+
+ return 0;
+
+no_dma:
+ rz_ssi_release_dma_channels(ssi);
+
+ return -ENODEV;
+}
+
+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, i, num_transfer = 1;
+
+ 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);
+
+ rz_ssi_stream_init(strm, substream);
+
+ if (ssi->dma_rt) {
+ bool is_playback;
+
+ is_playback = rz_ssi_stream_is_play(ssi, substream);
+ ret = rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch,
+ is_playback);
+ /* Fallback to pio */
+ if (ret < 0) {
+ ssi->playback.transfer = rz_ssi_pio_send;
+ ssi->capture.transfer = rz_ssi_pio_recv;
+ rz_ssi_release_dma_channels(ssi);
+ }
+ }
+
+ /* For DMA, queue up multiple DMA descriptors */
+ if (rz_ssi_is_dma_enabled(ssi))
+ num_transfer = 4;
+
+ for (i = 0; i < num_transfer; i++) {
+ ret = strm->transfer(ssi, strm);
+ if (ret)
+ goto done;
+ }
+
+ ret = rz_ssi_start(ssi, strm);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ rz_ssi_stop(ssi, strm);
+ 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);
+
+ switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
+ case SND_SOC_DAIFMT_BP_FP:
+ break;
+ default:
+ dev_err(ssi->dev, "Codec should be clk and frame consumer\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);
+ unsigned int sample_bits = hw_param_interval(params,
+ SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
+ unsigned int channels = params_channels(params);
+
+ if (sample_bits != 16) {
+ dev_err(ssi->dev, "Unsupported sample width: %d\n",
+ sample_bits);
+ return -EINVAL;
+ }
+
+ if (channels != 2) {
+ dev_err(ssi->dev, "Number of channels not matched: %d\n",
+ channels);
+ return -EINVAL;
+ }
+
+ 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,
+ .legacy_dai_naming = 1,
+};
+
+static int rz_ssi_probe(struct platform_device *pdev)
+{
+ struct rz_ssi_priv *ssi;
+ struct clk *audio_clk;
+ struct resource *res;
+ int ret;
+
+ ssi = devm_kzalloc(&pdev->dev, sizeof(*ssi), GFP_KERNEL);
+ if (!ssi)
+ return -ENOMEM;
+
+ ssi->pdev = pdev;
+ ssi->dev = &pdev->dev;
+ ssi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(ssi->base))
+ return PTR_ERR(ssi->base);
+
+ ssi->phys = res->start;
+ 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))
+ return dev_err_probe(&pdev->dev, PTR_ERR(audio_clk),
+ "no audio clk1");
+
+ ssi->audio_clk_1 = clk_get_rate(audio_clk);
+ audio_clk = devm_clk_get(&pdev->dev, "audio_clk2");
+ if (IS_ERR(audio_clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(audio_clk),
+ "no audio clk2");
+
+ ssi->audio_clk_2 = clk_get_rate(audio_clk);
+ if (!(ssi->audio_clk_1 || ssi->audio_clk_2))
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "no audio clk1 or audio clk2");
+
+ ssi->audio_mck = ssi->audio_clk_1 ? ssi->audio_clk_1 : ssi->audio_clk_2;
+
+ /* Detect DMA support */
+ ret = rz_ssi_dma_request(ssi, &pdev->dev);
+ if (ret < 0) {
+ dev_warn(&pdev->dev, "DMA not available, using PIO\n");
+ ssi->playback.transfer = rz_ssi_pio_send;
+ ssi->capture.transfer = rz_ssi_pio_recv;
+ } else {
+ dev_info(&pdev->dev, "DMA enabled");
+ ssi->playback.transfer = rz_ssi_dma_transfer;
+ ssi->capture.transfer = rz_ssi_dma_transfer;
+ }
+
+ ssi->playback.priv = ssi;
+ ssi->capture.priv = ssi;
+
+ spin_lock_init(&ssi->lock);
+ dev_set_drvdata(&pdev->dev, ssi);
+
+ /* Error Interrupt */
+ ssi->irq_int = platform_get_irq_byname(pdev, "int_req");
+ if (ssi->irq_int < 0) {
+ rz_ssi_release_dma_channels(ssi);
+ return ssi->irq_int;
+ }
+
+ ret = devm_request_irq(&pdev->dev, ssi->irq_int, &rz_ssi_interrupt,
+ 0, dev_name(&pdev->dev), ssi);
+ if (ret < 0) {
+ rz_ssi_release_dma_channels(ssi);
+ return dev_err_probe(&pdev->dev, ret,
+ "irq request error (int_req)\n");
+ }
+
+ if (!rz_ssi_is_dma_enabled(ssi)) {
+ /* Tx and Rx interrupts (pio only) */
+ ssi->irq_tx = platform_get_irq_byname(pdev, "dma_tx");
+ if (ssi->irq_tx < 0)
+ return ssi->irq_tx;
+
+ 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 ssi->irq_rx;
+
+ 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)) {
+ ret = PTR_ERR(ssi->rstc);
+ goto err_reset;
+ }
+
+ reset_control_deassert(ssi->rstc);
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pm_runtime_resume_and_get failed\n");
+ goto err_pm;
+ }
+
+ 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) {
+ dev_err(&pdev->dev, "failed to register snd component\n");
+ goto err_snd_soc;
+ }
+
+ return 0;
+
+err_snd_soc:
+ pm_runtime_put(ssi->dev);
+err_pm:
+ pm_runtime_disable(ssi->dev);
+ reset_control_assert(ssi->rstc);
+err_reset:
+ rz_ssi_release_dma_channels(ssi);
+
+ return ret;
+}
+
+static int rz_ssi_remove(struct platform_device *pdev)
+{
+ struct rz_ssi_priv *ssi = dev_get_drvdata(&pdev->dev);
+
+ rz_ssi_release_dma_channels(ssi);
+
+ 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>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 18:27:19 +0000