--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Troy Mitchell <troy.mitchell@linux.spacemit.com> */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#define SSCR 0x00 /* SPI/I2S top control register */
+#define SSFCR 0x04 /* SPI/I2S FIFO control register */
+#define SSINTEN 0x08 /* SPI/I2S interrupt enable register */
+#define SSDATR 0x10 /* SPI/I2S data register */
+#define SSPSP 0x18 /* SPI/I2S programmable serial protocol control register */
+#define SSRWT 0x24 /* SPI/I2S root control register */
+
+/* SPI/I2S Work data size, register bits value 0~31 indicated data size 1~32 bits */
+#define SSCR_FIELD_DSS GENMASK(9, 5)
+#define SSCR_DW_8BYTE FIELD_PREP(SSCR_FIELD_DSS, 0x7)
+#define SSCR_DW_16BYTE FIELD_PREP(SSCR_FIELD_DSS, 0xf)
+#define SSCR_DW_18BYTE FIELD_PREP(SSCR_FIELD_DSS, 0x11)
+#define SSCR_DW_32BYTE FIELD_PREP(SSCR_FIELD_DSS, 0x1f)
+
+#define SSCR_SSE BIT(0) /* SPI/I2S Enable */
+#define SSCR_FRF_PSP GENMASK(2, 1) /* Frame Format*/
+#define SSCR_TRAIL BIT(13) /* Trailing Byte */
+
+#define SSFCR_FIELD_TFT GENMASK(3, 0) /* TXFIFO Trigger Threshold */
+#define SSFCR_FIELD_RFT GENMASK(8, 5) /* RXFIFO Trigger Threshold */
+#define SSFCR_TSRE BIT(10) /* Transmit Service Request Enable */
+#define SSFCR_RSRE BIT(11) /* Receive Service Request Enable */
+
+#define SSPSP_FSRT BIT(3) /* Frame Sync Relative Timing Bit */
+#define SSPSP_SFRMP BIT(4) /* Serial Frame Polarity */
+#define SSPSP_FIELD_SFRMWDTH GENMASK(17, 12) /* Serial Frame Width field */
+
+#define SSRWT_RWOT BIT(0) /* Receive Without Transmit */
+
+#define SPACEMIT_PCM_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | \
+ SNDRV_PCM_RATE_48000)
+#define SPACEMIT_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+#define SPACEMIT_I2S_PERIOD_SIZE 1024
+
+struct spacemit_i2s_dev {
+ struct device *dev;
+
+ void __iomem *base;
+
+ struct reset_control *reset;
+
+ struct clk *sysclk;
+ struct clk *bclk;
+ struct clk *sspa_clk;
+
+ struct snd_dmaengine_dai_dma_data capture_dma_data;
+ struct snd_dmaengine_dai_dma_data playback_dma_data;
+
+ bool has_capture;
+ bool has_playback;
+
+ int dai_fmt;
+
+ int started_count;
+};
+
+static const struct snd_pcm_hardware spacemit_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BATCH,
+ .formats = SPACEMIT_PCM_FORMATS,
+ .rates = SPACEMIT_PCM_RATES,
+ .rate_min = SNDRV_PCM_RATE_8000,
+ .rate_max = SNDRV_PCM_RATE_192000,
+ .channels_min = 1,
+ .channels_max = 2,
+ .buffer_bytes_max = SPACEMIT_I2S_PERIOD_SIZE * 4 * 4,
+ .period_bytes_min = SPACEMIT_I2S_PERIOD_SIZE * 2,
+ .period_bytes_max = SPACEMIT_I2S_PERIOD_SIZE * 4,
+ .periods_min = 2,
+ .periods_max = 4,
+};
+
+static const struct snd_dmaengine_pcm_config spacemit_dmaengine_pcm_config = {
+ .pcm_hardware = &spacemit_pcm_hardware,
+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+ .chan_names = {"tx", "rx"},
+ .prealloc_buffer_size = 32 * 1024,
+};
+
+static void spacemit_i2s_init(struct spacemit_i2s_dev *i2s)
+{
+ u32 sscr_val, sspsp_val, ssfcr_val, ssrwt_val;
+
+ sscr_val = SSCR_TRAIL | SSCR_FRF_PSP;
+ ssfcr_val = FIELD_PREP(SSFCR_FIELD_TFT, 5) |
+ FIELD_PREP(SSFCR_FIELD_RFT, 5) |
+ SSFCR_RSRE | SSFCR_TSRE;
+ ssrwt_val = SSRWT_RWOT;
+ sspsp_val = SSPSP_SFRMP;
+
+ writel(sscr_val, i2s->base + SSCR);
+ writel(ssfcr_val, i2s->base + SSFCR);
+ writel(sspsp_val, i2s->base + SSPSP);
+ writel(ssrwt_val, i2s->base + SSRWT);
+ writel(0, i2s->base + SSINTEN);
+}
+
+static int spacemit_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct spacemit_i2s_dev *i2s = snd_soc_dai_get_drvdata(dai);
+ struct snd_dmaengine_dai_dma_data *dma_data;
+ u32 data_width, data_bits;
+ unsigned long bclk_rate;
+ u32 val;
+ int ret;
+
+ val = readl(i2s->base + SSCR);
+ if (val & SSCR_SSE)
+ return 0;
+
+ dma_data = &i2s->playback_dma_data;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ dma_data = &i2s->capture_dma_data;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ data_bits = 8;
+ data_width = SSCR_DW_8BYTE;
+ dma_data->maxburst = 8;
+ dma_data->addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ break;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ data_bits = 16;
+ data_width = SSCR_DW_16BYTE;
+ dma_data->maxburst = 16;
+ dma_data->addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ data_bits = 32;
+ data_width = SSCR_DW_32BYTE;
+ dma_data->maxburst = 32;
+ dma_data->addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ default:
+ dev_dbg(i2s->dev, "unexpected data width type");
+ return -EINVAL;
+ }
+
+ switch (i2s->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ if (data_bits == 16) {
+ data_width = SSCR_DW_32BYTE;
+ dma_data->maxburst = 32;
+ dma_data->addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ }
+
+ snd_pcm_hw_constraint_minmax(substream->runtime,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ 1, 2);
+ snd_pcm_hw_constraint_mask64(substream->runtime,
+ SNDRV_PCM_HW_PARAM_FORMAT,
+ SNDRV_PCM_FMTBIT_S16_LE);
+ break;
+ case SND_SOC_DAIFMT_DSP_A:
+ case SND_SOC_DAIFMT_DSP_B:
+ snd_pcm_hw_constraint_minmax(substream->runtime,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ 1, 1);
+ snd_pcm_hw_constraint_mask64(substream->runtime,
+ SNDRV_PCM_HW_PARAM_FORMAT,
+ SNDRV_PCM_FMTBIT_S32_LE);
+ break;
+ default:
+ dev_dbg(i2s->dev, "unexpected format type");
+ return -EINVAL;
+
+ }
+
+ val = readl(i2s->base + SSCR);
+ val &= ~SSCR_DW_32BYTE;
+ val |= data_width;
+ writel(val, i2s->base + SSCR);
+
+ bclk_rate = params_channels(params) *
+ params_rate(params) *
+ data_bits;
+
+ ret = clk_set_rate(i2s->bclk, bclk_rate);
+ if (ret)
+ return ret;
+
+ return clk_set_rate(i2s->sspa_clk, bclk_rate);
+}
+
+static int spacemit_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
+ unsigned int freq, int dir)
+{
+ struct spacemit_i2s_dev *i2s = dev_get_drvdata(cpu_dai->dev);
+
+ if (freq == 0)
+ return 0;
+
+ return clk_set_rate(i2s->sysclk, freq);
+}
+
+static int spacemit_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ struct spacemit_i2s_dev *i2s = dev_get_drvdata(cpu_dai->dev);
+ u32 sspsp_val;
+
+ sspsp_val = readl(i2s->base + SSPSP);
+ sspsp_val &= ~SSPSP_FIELD_SFRMWDTH;
+ sspsp_val |= SSPSP_FSRT;
+
+ i2s->dai_fmt = fmt;
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ sspsp_val |= FIELD_PREP(SSPSP_FIELD_SFRMWDTH, 0x10);
+ break;
+ case SND_SOC_DAIFMT_DSP_B:
+ /* DSP_B: next frame asserted after previous frame end, so clear FSRT */
+ sspsp_val &= ~SSPSP_FSRT;
+ fallthrough;
+ case SND_SOC_DAIFMT_DSP_A:
+ sspsp_val |= FIELD_PREP(SSPSP_FIELD_SFRMWDTH, 0x1);
+ break;
+ default:
+ dev_dbg(i2s->dev, "unexpected format type");
+ return -EINVAL;
+ }
+
+ writel(sspsp_val, i2s->base + SSPSP);
+
+ return 0;
+}
+
+static int spacemit_i2s_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ struct spacemit_i2s_dev *i2s = snd_soc_dai_get_drvdata(dai);
+ u32 val;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (!i2s->started_count) {
+ val = readl(i2s->base + SSCR);
+ val |= SSCR_SSE;
+ writel(val, i2s->base + SSCR);
+ }
+ i2s->started_count++;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (i2s->started_count)
+ i2s->started_count--;
+
+ if (!i2s->started_count) {
+ val = readl(i2s->base + SSCR);
+ val &= ~SSCR_SSE;
+ writel(val, i2s->base + SSCR);
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int spacemit_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+ struct spacemit_i2s_dev *i2s = snd_soc_dai_get_drvdata(dai);
+
+ snd_soc_dai_init_dma_data(dai,
+ i2s->has_playback ? &i2s->playback_dma_data : NULL,
+ i2s->has_capture ? &i2s->capture_dma_data : NULL);
+
+ reset_control_deassert(i2s->reset);
+
+ spacemit_i2s_init(i2s);
+
+ return 0;
+}
+
+static int spacemit_i2s_dai_remove(struct snd_soc_dai *dai)
+{
+ struct spacemit_i2s_dev *i2s = snd_soc_dai_get_drvdata(dai);
+
+ reset_control_assert(i2s->reset);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops spacemit_i2s_dai_ops = {
+ .probe = spacemit_i2s_dai_probe,
+ .remove = spacemit_i2s_dai_remove,
+ .hw_params = spacemit_i2s_hw_params,
+ .set_sysclk = spacemit_i2s_set_sysclk,
+ .set_fmt = spacemit_i2s_set_fmt,
+ .trigger = spacemit_i2s_trigger,
+};
+
+static struct snd_soc_dai_driver spacemit_i2s_dai = {
+ .ops = &spacemit_i2s_dai_ops,
+ .playback = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SPACEMIT_PCM_RATES,
+ .rate_min = SNDRV_PCM_RATE_8000,
+ .rate_max = SNDRV_PCM_RATE_48000,
+ .formats = SPACEMIT_PCM_FORMATS,
+ },
+ .capture = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SPACEMIT_PCM_RATES,
+ .rate_min = SNDRV_PCM_RATE_8000,
+ .rate_max = SNDRV_PCM_RATE_48000,
+ .formats = SPACEMIT_PCM_FORMATS,
+ },
+ .symmetric_rate = 1,
+};
+
+static int spacemit_i2s_init_dai(struct spacemit_i2s_dev *i2s,
+ struct snd_soc_dai_driver **dp,
+ dma_addr_t addr)
+{
+ struct device_node *node = i2s->dev->of_node;
+ struct snd_soc_dai_driver *dai;
+ struct property *dma_names;
+ const char *dma_name;
+
+ of_property_for_each_string(node, "dma-names", dma_names, dma_name) {
+ if (!strcmp(dma_name, "tx"))
+ i2s->has_playback = true;
+ if (!strcmp(dma_name, "rx"))
+ i2s->has_capture = true;
+ }
+
+ dai = devm_kmemdup(i2s->dev, &spacemit_i2s_dai,
+ sizeof(*dai), GFP_KERNEL);
+ if (!dai)
+ return -ENOMEM;
+
+ if (i2s->has_playback) {
+ dai->playback.stream_name = "Playback";
+ dai->playback.channels_min = 1;
+ dai->playback.channels_max = 2;
+ dai->playback.rates = SPACEMIT_PCM_RATES;
+ dai->playback.formats = SPACEMIT_PCM_FORMATS;
+
+ i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ i2s->playback_dma_data.maxburst = 32;
+ i2s->playback_dma_data.addr = addr;
+ }
+
+ if (i2s->has_capture) {
+ dai->capture.stream_name = "Capture";
+ dai->capture.channels_min = 1;
+ dai->capture.channels_max = 2;
+ dai->capture.rates = SPACEMIT_PCM_RATES;
+ dai->capture.formats = SPACEMIT_PCM_FORMATS;
+
+ i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ i2s->capture_dma_data.maxburst = 32;
+ i2s->capture_dma_data.addr = addr;
+ }
+
+ if (dp)
+ *dp = dai;
+
+ return 0;
+}
+
+static const struct snd_soc_component_driver spacemit_i2s_component = {
+ .name = "i2s-k1",
+ .legacy_dai_naming = 1,
+};
+
+static int spacemit_i2s_probe(struct platform_device *pdev)
+{
+ struct snd_soc_dai_driver *dai;
+ struct spacemit_i2s_dev *i2s;
+ struct resource *res;
+ struct clk *clk;
+ int ret;
+
+ i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
+ if (!i2s)
+ return -ENOMEM;
+
+ i2s->dev = &pdev->dev;
+
+ i2s->sysclk = devm_clk_get_enabled(i2s->dev, "sysclk");
+ if (IS_ERR(i2s->sysclk))
+ return dev_err_probe(i2s->dev, PTR_ERR(i2s->sysclk),
+ "failed to enable sysbase clock\n");
+
+ i2s->bclk = devm_clk_get_enabled(i2s->dev, "bclk");
+ if (IS_ERR(i2s->bclk))
+ return dev_err_probe(i2s->dev, PTR_ERR(i2s->bclk), "failed to enable bit clock\n");
+
+ clk = devm_clk_get_enabled(i2s->dev, "sspa_bus");
+ if (IS_ERR(clk))
+ return dev_err_probe(i2s->dev, PTR_ERR(clk), "failed to enable sspa_bus clock\n");
+
+ i2s->sspa_clk = devm_clk_get_enabled(i2s->dev, "sspa");
+ if (IS_ERR(clk))
+ return dev_err_probe(i2s->dev, PTR_ERR(clk), "failed to enable sspa clock\n");
+
+ i2s->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(i2s->base))
+ return dev_err_probe(i2s->dev, PTR_ERR(i2s->base), "failed to map registers\n");
+
+ i2s->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(i2s->reset))
+ return dev_err_probe(i2s->dev, PTR_ERR(i2s->reset),
+ "failed to get reset control");
+
+ dev_set_drvdata(i2s->dev, i2s);
+
+ spacemit_i2s_init_dai(i2s, &dai, res->start + SSDATR);
+
+ ret = devm_snd_soc_register_component(i2s->dev,
+ &spacemit_i2s_component,
+ dai, 1);
+ if (ret)
+ return dev_err_probe(i2s->dev, ret, "failed to register component");
+
+ return devm_snd_dmaengine_pcm_register(&pdev->dev, &spacemit_dmaengine_pcm_config, 0);
+}
+
+static const struct of_device_id spacemit_i2s_of_match[] = {
+ { .compatible = "spacemit,k1-i2s", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, spacemit_i2s_of_match);
+
+static struct platform_driver spacemit_i2s_driver = {
+ .probe = spacemit_i2s_probe,
+ .driver = {
+ .name = "i2s-k1",
+ .of_match_table = spacemit_i2s_of_match,
+ },
+};
+module_platform_driver(spacemit_i2s_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("I2S bus driver for SpacemiT K1 SoC");
projects / thirdparty / kernel / linux.git / commitdiff
