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-rw-r--r--sound/soc/codecs/rt5514-spi.c514
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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 08:54:07 +0000