1 files changed, 514 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt5514-spi.c b/sound/soc/codecs/rt5514-spi.c
new file mode 100644
index 000000000..1a25a3787
--- /dev/null
+++ b/sound/soc/codecs/rt5514-spi.c
@@ -0,0 +1,514 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * rt5514-spi.c  --  RT5514 SPI driver
+ *
+ * Copyright 2015 Realtek Semiconductor Corp.
+ * Author: Oder Chiou <oder_chiou@realtek.com>
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/spi/spi.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_qos.h>
+#include <linux/sysfs.h>
+#include <linux/clk.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+
+#include "rt5514-spi.h"
+
+#define DRV_NAME "rt5514-spi"
+
+static struct spi_device *rt5514_spi;
+
+struct rt5514_dsp {
+	struct device *dev;
+	struct delayed_work copy_work;
+	struct mutex dma_lock;
+	struct snd_pcm_substream *substream;
+	unsigned int buf_base, buf_limit, buf_rp;
+	size_t buf_size, get_size, dma_offset;
+};
+
+static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
+	.info			= SNDRV_PCM_INFO_MMAP |
+				  SNDRV_PCM_INFO_MMAP_VALID |
+				  SNDRV_PCM_INFO_INTERLEAVED,
+	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+	.period_bytes_min	= PAGE_SIZE,
+	.period_bytes_max	= 0x20000 / 8,
+	.periods_min		= 8,
+	.periods_max		= 8,
+	.channels_min		= 1,
+	.channels_max		= 1,
+	.buffer_bytes_max	= 0x20000,
+};
+
+static struct snd_soc_dai_driver rt5514_spi_dai = {
+	.name = "rt5514-dsp-cpu-dai",
+	.id = 0,
+	.capture = {
+		.stream_name = "DSP Capture",
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = SNDRV_PCM_RATE_16000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+};
+
+static void rt5514_spi_copy_work(struct work_struct *work)
+{
+	struct rt5514_dsp *rt5514_dsp =
+		container_of(work, struct rt5514_dsp, copy_work.work);
+	struct snd_pcm_runtime *runtime;
+	size_t period_bytes, truncated_bytes = 0;
+	unsigned int cur_wp, remain_data;
+	u8 buf[8];
+
+	mutex_lock(&rt5514_dsp->dma_lock);
+	if (!rt5514_dsp->substream) {
+		dev_err(rt5514_dsp->dev, "No pcm substream\n");
+		goto done;
+	}
+
+	runtime = rt5514_dsp->substream->runtime;
+	period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
+	if (!period_bytes) {
+		schedule_delayed_work(&rt5514_dsp->copy_work, 5);
+		goto done;
+	}
+
+	if (rt5514_dsp->buf_size % period_bytes)
+		rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
+			period_bytes;
+
+	if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
+		rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
+			sizeof(buf));
+		cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
+					buf[3] << 24;
+
+		if (cur_wp >= rt5514_dsp->buf_rp)
+			remain_data = (cur_wp - rt5514_dsp->buf_rp);
+		else
+			remain_data =
+				(rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
+				(cur_wp - rt5514_dsp->buf_base);
+
+		if (remain_data < period_bytes) {
+			schedule_delayed_work(&rt5514_dsp->copy_work, 5);
+			goto done;
+		}
+	}
+
+	if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
+		rt5514_spi_burst_read(rt5514_dsp->buf_rp,
+			runtime->dma_area + rt5514_dsp->dma_offset,
+			period_bytes);
+
+		if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
+			rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
+		else
+			rt5514_dsp->buf_rp += period_bytes;
+	} else {
+		truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
+		rt5514_spi_burst_read(rt5514_dsp->buf_rp,
+			runtime->dma_area + rt5514_dsp->dma_offset,
+			truncated_bytes);
+
+		rt5514_spi_burst_read(rt5514_dsp->buf_base,
+			runtime->dma_area + rt5514_dsp->dma_offset +
+			truncated_bytes, period_bytes - truncated_bytes);
+
+		rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
+			truncated_bytes;
+	}
+
+	rt5514_dsp->get_size += period_bytes;
+	rt5514_dsp->dma_offset += period_bytes;
+	if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
+		rt5514_dsp->dma_offset = 0;
+
+	snd_pcm_period_elapsed(rt5514_dsp->substream);
+
+	schedule_delayed_work(&rt5514_dsp->copy_work, 5);
+
+done:
+	mutex_unlock(&rt5514_dsp->dma_lock);
+}
+
+static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
+{
+	u8 buf[8];
+
+	if (!rt5514_dsp->substream)
+		return;
+
+	rt5514_dsp->get_size = 0;
+
+	/**
+	 * The address area x1800XXXX is the register address, and it cannot
+	 * support spi burst read perfectly. So we use the spi burst read
+	 * individually to make sure the data correctly.
+	 */
+	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
+		sizeof(buf));
+	rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
+				buf[3] << 24;
+
+	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
+		sizeof(buf));
+	rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
+				buf[3] << 24;
+
+	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
+		sizeof(buf));
+	rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
+				buf[3] << 24;
+
+	if (rt5514_dsp->buf_rp % 8)
+		rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
+
+	rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
+
+	if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
+		rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
+		schedule_delayed_work(&rt5514_dsp->copy_work, 0);
+}
+
+static irqreturn_t rt5514_spi_irq(int irq, void *data)
+{
+	struct rt5514_dsp *rt5514_dsp = data;
+
+	rt5514_schedule_copy(rt5514_dsp);
+
+	return IRQ_HANDLED;
+}
+
+/* PCM for streaming audio from the DSP buffer */
+static int rt5514_spi_pcm_open(struct snd_soc_component *component,
+			       struct snd_pcm_substream *substream)
+{
+	snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
+
+	return 0;
+}
+
+static int rt5514_spi_hw_params(struct snd_soc_component *component,
+				struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *hw_params)
+{
+	struct rt5514_dsp *rt5514_dsp =
+		snd_soc_component_get_drvdata(component);
+	u8 buf[8];
+
+	mutex_lock(&rt5514_dsp->dma_lock);
+	rt5514_dsp->substream = substream;
+	rt5514_dsp->dma_offset = 0;
+
+	/* Read IRQ status and schedule copy accordingly. */
+	rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
+	if (buf[0] & RT5514_IRQ_STATUS_BIT)
+		rt5514_schedule_copy(rt5514_dsp);
+
+	mutex_unlock(&rt5514_dsp->dma_lock);
+
+	return 0;
+}
+
+static int rt5514_spi_hw_free(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream)
+{
+	struct rt5514_dsp *rt5514_dsp =
+		snd_soc_component_get_drvdata(component);
+
+	mutex_lock(&rt5514_dsp->dma_lock);
+	rt5514_dsp->substream = NULL;
+	mutex_unlock(&rt5514_dsp->dma_lock);
+
+	cancel_delayed_work_sync(&rt5514_dsp->copy_work);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
+		struct snd_soc_component *component,
+		struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct rt5514_dsp *rt5514_dsp =
+		snd_soc_component_get_drvdata(component);
+
+	return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
+}
+
+
+static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
+{
+	struct rt5514_dsp *rt5514_dsp;
+	int ret;
+
+	rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
+			GFP_KERNEL);
+	if (!rt5514_dsp)
+		return -ENOMEM;
+
+	rt5514_dsp->dev = &rt5514_spi->dev;
+	mutex_init(&rt5514_dsp->dma_lock);
+	INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
+	snd_soc_component_set_drvdata(component, rt5514_dsp);
+
+	if (rt5514_spi->irq) {
+		ret = devm_request_threaded_irq(&rt5514_spi->dev,
+			rt5514_spi->irq, NULL, rt5514_spi_irq,
+			IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
+			rt5514_dsp);
+		if (ret)
+			dev_err(&rt5514_spi->dev,
+				"%s Failed to reguest IRQ: %d\n", __func__,
+				ret);
+		else
+			device_init_wakeup(rt5514_dsp->dev, true);
+	}
+
+	return 0;
+}
+
+static int rt5514_spi_pcm_new(struct snd_soc_component *component,
+			      struct snd_soc_pcm_runtime *rtd)
+{
+	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC,
+				       NULL, 0, 0);
+	return 0;
+}
+
+static const struct snd_soc_component_driver rt5514_spi_component = {
+	.name		= DRV_NAME,
+	.probe		= rt5514_spi_pcm_probe,
+	.open		= rt5514_spi_pcm_open,
+	.hw_params	= rt5514_spi_hw_params,
+	.hw_free	= rt5514_spi_hw_free,
+	.pointer	= rt5514_spi_pcm_pointer,
+	.pcm_construct	= rt5514_spi_pcm_new,
+};
+
+/**
+ * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
+ * @addr: Start address.
+ * @rxbuf: Data Buffer for reading.
+ * @len: Data length, it must be a multiple of 8.
+ *
+ *
+ * Returns true for success.
+ */
+int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
+{
+	u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
+	int status;
+	u8 write_buf[8];
+	unsigned int i, end, offset = 0;
+
+	struct spi_message message;
+	struct spi_transfer x[3];
+
+	while (offset < len) {
+		if (offset + RT5514_SPI_BUF_LEN <= len)
+			end = RT5514_SPI_BUF_LEN;
+		else
+			end = len % RT5514_SPI_BUF_LEN;
+
+		write_buf[0] = spi_cmd;
+		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
+		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
+		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
+		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
+
+		spi_message_init(&message);
+		memset(x, 0, sizeof(x));
+
+		x[0].len = 5;
+		x[0].tx_buf = write_buf;
+		spi_message_add_tail(&x[0], &message);
+
+		x[1].len = 4;
+		x[1].tx_buf = write_buf;
+		spi_message_add_tail(&x[1], &message);
+
+		x[2].len = end;
+		x[2].rx_buf = rxbuf + offset;
+		spi_message_add_tail(&x[2], &message);
+
+		status = spi_sync(rt5514_spi, &message);
+
+		if (status)
+			return false;
+
+		offset += RT5514_SPI_BUF_LEN;
+	}
+
+	for (i = 0; i < len; i += 8) {
+		write_buf[0] = rxbuf[i + 0];
+		write_buf[1] = rxbuf[i + 1];
+		write_buf[2] = rxbuf[i + 2];
+		write_buf[3] = rxbuf[i + 3];
+		write_buf[4] = rxbuf[i + 4];
+		write_buf[5] = rxbuf[i + 5];
+		write_buf[6] = rxbuf[i + 6];
+		write_buf[7] = rxbuf[i + 7];
+
+		rxbuf[i + 0] = write_buf[7];
+		rxbuf[i + 1] = write_buf[6];
+		rxbuf[i + 2] = write_buf[5];
+		rxbuf[i + 3] = write_buf[4];
+		rxbuf[i + 4] = write_buf[3];
+		rxbuf[i + 5] = write_buf[2];
+		rxbuf[i + 6] = write_buf[1];
+		rxbuf[i + 7] = write_buf[0];
+	}
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);
+
+/**
+ * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
+ * @addr: Start address.
+ * @txbuf: Data Buffer for writng.
+ * @len: Data length, it must be a multiple of 8.
+ *
+ *
+ * Returns true for success.
+ */
+int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
+{
+	u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
+	u8 *write_buf;
+	unsigned int i, end, offset = 0;
+
+	write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
+
+	if (write_buf == NULL)
+		return -ENOMEM;
+
+	while (offset < len) {
+		if (offset + RT5514_SPI_BUF_LEN <= len)
+			end = RT5514_SPI_BUF_LEN;
+		else
+			end = len % RT5514_SPI_BUF_LEN;
+
+		write_buf[0] = spi_cmd;
+		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
+		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
+		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
+		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
+
+		for (i = 0; i < end; i += 8) {
+			write_buf[i + 12] = txbuf[offset + i + 0];
+			write_buf[i + 11] = txbuf[offset + i + 1];
+			write_buf[i + 10] = txbuf[offset + i + 2];
+			write_buf[i +  9] = txbuf[offset + i + 3];
+			write_buf[i +  8] = txbuf[offset + i + 4];
+			write_buf[i +  7] = txbuf[offset + i + 5];
+			write_buf[i +  6] = txbuf[offset + i + 6];
+			write_buf[i +  5] = txbuf[offset + i + 7];
+		}
+
+		write_buf[end + 5] = spi_cmd;
+
+		spi_write(rt5514_spi, write_buf, end + 6);
+
+		offset += RT5514_SPI_BUF_LEN;
+	}
+
+	kfree(write_buf);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
+
+static int rt5514_spi_probe(struct spi_device *spi)
+{
+	int ret;
+
+	rt5514_spi = spi;
+
+	ret = devm_snd_soc_register_component(&spi->dev,
+					      &rt5514_spi_component,
+					      &rt5514_spi_dai, 1);
+	if (ret < 0) {
+		dev_err(&spi->dev, "Failed to register component.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused rt5514_suspend(struct device *dev)
+{
+	int irq = to_spi_device(dev)->irq;
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(irq);
+
+	return 0;
+}
+
+static int __maybe_unused rt5514_resume(struct device *dev)
+{
+	struct rt5514_dsp *rt5514_dsp = dev_get_drvdata(dev);
+	int irq = to_spi_device(dev)->irq;
+	u8 buf[8];
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(irq);
+
+	if (rt5514_dsp) {
+		if (rt5514_dsp->substream) {
+			rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
+				sizeof(buf));
+			if (buf[0] & RT5514_IRQ_STATUS_BIT)
+				rt5514_schedule_copy(rt5514_dsp);
+		}
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops rt5514_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
+};
+
+static const struct of_device_id rt5514_of_match[] = {
+	{ .compatible = "realtek,rt5514", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rt5514_of_match);
+
+static struct spi_driver rt5514_spi_driver = {
+	.driver = {
+		.name = "rt5514",
+		.pm = &rt5514_pm_ops,
+		.of_match_table = of_match_ptr(rt5514_of_match),
+	},
+	.probe = rt5514_spi_probe,
+};
+module_spi_driver(rt5514_spi_driver);
+
+MODULE_DESCRIPTION("RT5514 SPI driver");
+MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
+MODULE_LICENSE("GPL v2");