diff options
Diffstat (limited to 'sound/soc/codecs/rt5677-spi.c')
| -rw-r--r-- | sound/soc/codecs/rt5677-spi.c | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/sound/soc/codecs/rt5677-spi.c b/sound/soc/codecs/rt5677-spi.c new file mode 100644 index 000000000..d25703dd7 --- /dev/null +++ b/sound/soc/codecs/rt5677-spi.c @@ -0,0 +1,637 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rt5677-spi.c -- RT5677 ALSA SoC audio codec driver + * + * Copyright 2013 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/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 <linux/firmware.h> +#include <linux/acpi.h> + +#include <sound/soc.h> + +#include "rt5677.h" +#include "rt5677-spi.h" + +#define DRV_NAME "rt5677spi" + +#define RT5677_SPI_BURST_LEN 240 +#define RT5677_SPI_HEADER 5 +#define RT5677_SPI_FREQ 6000000 + +/* The AddressPhase and DataPhase of SPI commands are MSB first on the wire. + * DataPhase word size of 16-bit commands is 2 bytes. + * DataPhase word size of 32-bit commands is 4 bytes. + * DataPhase word size of burst commands is 8 bytes. + * The DSP CPU is little-endian. + */ +#define RT5677_SPI_WRITE_BURST 0x5 +#define RT5677_SPI_READ_BURST 0x4 +#define RT5677_SPI_WRITE_32 0x3 +#define RT5677_SPI_READ_32 0x2 +#define RT5677_SPI_WRITE_16 0x1 +#define RT5677_SPI_READ_16 0x0 + +#define RT5677_BUF_BYTES_TOTAL 0x20000 +#define RT5677_MIC_BUF_ADDR 0x60030000 +#define RT5677_MODEL_ADDR 0x5FFC9800 +#define RT5677_MIC_BUF_BYTES ((u32)(RT5677_BUF_BYTES_TOTAL - \ + sizeof(u32))) +#define RT5677_MIC_BUF_FIRST_READ_SIZE 0x10000 + +static struct spi_device *g_spi; +static DEFINE_MUTEX(spi_mutex); + +struct rt5677_dsp { + struct device *dev; + struct delayed_work copy_work; + struct mutex dma_lock; + struct snd_pcm_substream *substream; + size_t dma_offset; /* zero-based offset into runtime->dma_area */ + size_t avail_bytes; /* number of new bytes since last period */ + u32 mic_read_offset; /* zero-based offset into DSP's mic buffer */ + bool new_hotword; /* a new hotword is fired */ +}; + +static const struct snd_pcm_hardware rt5677_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 = RT5677_BUF_BYTES_TOTAL / 8, + .periods_min = 8, + .periods_max = 8, + .channels_min = 1, + .channels_max = 1, + .buffer_bytes_max = RT5677_BUF_BYTES_TOTAL, +}; + +static struct snd_soc_dai_driver rt5677_spi_dai = { + /* The DAI name "rt5677-dsp-cpu-dai" is not used. The actual DAI name + * registered with ASoC is the name of the device "spi-RT5677AA:00", + * because we only have one DAI. See snd_soc_register_dais(). + */ + .name = "rt5677-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, + }, +}; + +/* PCM for streaming audio from the DSP buffer */ +static int rt5677_spi_pcm_open( + struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + snd_soc_set_runtime_hwparams(substream, &rt5677_spi_pcm_hardware); + return 0; +} + +static int rt5677_spi_pcm_close( + struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snd_soc_component *codec_component = + snd_soc_rtdcom_lookup(rtd, "rt5677"); + struct rt5677_priv *rt5677 = + snd_soc_component_get_drvdata(codec_component); + struct rt5677_dsp *rt5677_dsp = + snd_soc_component_get_drvdata(component); + + cancel_delayed_work_sync(&rt5677_dsp->copy_work); + rt5677->set_dsp_vad(codec_component, false); + return 0; +} + +static int rt5677_spi_hw_params( + struct snd_soc_component *component, + struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct rt5677_dsp *rt5677_dsp = + snd_soc_component_get_drvdata(component); + + mutex_lock(&rt5677_dsp->dma_lock); + rt5677_dsp->substream = substream; + mutex_unlock(&rt5677_dsp->dma_lock); + + return 0; +} + +static int rt5677_spi_hw_free( + struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct rt5677_dsp *rt5677_dsp = + snd_soc_component_get_drvdata(component); + + mutex_lock(&rt5677_dsp->dma_lock); + rt5677_dsp->substream = NULL; + mutex_unlock(&rt5677_dsp->dma_lock); + + return 0; +} + +static int rt5677_spi_prepare( + struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snd_soc_component *rt5677_component = + snd_soc_rtdcom_lookup(rtd, "rt5677"); + struct rt5677_priv *rt5677 = + snd_soc_component_get_drvdata(rt5677_component); + struct rt5677_dsp *rt5677_dsp = + snd_soc_component_get_drvdata(component); + + rt5677->set_dsp_vad(rt5677_component, true); + rt5677_dsp->dma_offset = 0; + rt5677_dsp->avail_bytes = 0; + return 0; +} + +static snd_pcm_uframes_t rt5677_spi_pcm_pointer( + struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct rt5677_dsp *rt5677_dsp = + snd_soc_component_get_drvdata(component); + + return bytes_to_frames(runtime, rt5677_dsp->dma_offset); +} + +static int rt5677_spi_mic_write_offset(u32 *mic_write_offset) +{ + int ret; + /* Grab the first 4 bytes that hold the write pointer on the + * dsp, and check to make sure that it points somewhere inside the + * buffer. + */ + ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR, mic_write_offset, + sizeof(u32)); + if (ret) + return ret; + /* Adjust the offset so that it's zero-based */ + *mic_write_offset = *mic_write_offset - sizeof(u32); + return *mic_write_offset < RT5677_MIC_BUF_BYTES ? 0 : -EFAULT; +} + +/* + * Copy one contiguous block of audio samples from the DSP mic buffer to the + * dma_area of the pcm runtime. The receiving buffer may wrap around. + * @begin: start offset of the block to copy, in bytes. + * @end: offset of the first byte after the block to copy, must be greater + * than or equal to begin. + * + * Return: Zero if successful, or a negative error code on failure. + */ +static int rt5677_spi_copy_block(struct rt5677_dsp *rt5677_dsp, + u32 begin, u32 end) +{ + struct snd_pcm_runtime *runtime = rt5677_dsp->substream->runtime; + size_t bytes_per_frame = frames_to_bytes(runtime, 1); + size_t first_chunk_len, second_chunk_len; + int ret; + + if (begin > end || runtime->dma_bytes < 2 * bytes_per_frame) { + dev_err(rt5677_dsp->dev, + "Invalid copy from (%u, %u), dma_area size %zu\n", + begin, end, runtime->dma_bytes); + return -EINVAL; + } + + /* The block to copy is empty */ + if (begin == end) + return 0; + + /* If the incoming chunk is too big for the receiving buffer, only the + * last "receiving buffer size - one frame" bytes are copied. + */ + if (end - begin > runtime->dma_bytes - bytes_per_frame) + begin = end - (runtime->dma_bytes - bytes_per_frame); + + /* May need to split to two chunks, calculate the size of each */ + first_chunk_len = end - begin; + second_chunk_len = 0; + if (rt5677_dsp->dma_offset + first_chunk_len > runtime->dma_bytes) { + /* Receiving buffer wrapped around */ + second_chunk_len = first_chunk_len; + first_chunk_len = runtime->dma_bytes - rt5677_dsp->dma_offset; + second_chunk_len -= first_chunk_len; + } + + /* Copy first chunk */ + ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR + sizeof(u32) + begin, + runtime->dma_area + rt5677_dsp->dma_offset, + first_chunk_len); + if (ret) + return ret; + rt5677_dsp->dma_offset += first_chunk_len; + if (rt5677_dsp->dma_offset == runtime->dma_bytes) + rt5677_dsp->dma_offset = 0; + + /* Copy second chunk */ + if (second_chunk_len) { + ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR + sizeof(u32) + + begin + first_chunk_len, runtime->dma_area, + second_chunk_len); + if (!ret) + rt5677_dsp->dma_offset = second_chunk_len; + } + return ret; +} + +/* + * Copy a given amount of audio samples from the DSP mic buffer starting at + * mic_read_offset, to the dma_area of the pcm runtime. The source buffer may + * wrap around. mic_read_offset is updated after successful copy. + * @amount: amount of samples to copy, in bytes. + * + * Return: Zero if successful, or a negative error code on failure. + */ +static int rt5677_spi_copy(struct rt5677_dsp *rt5677_dsp, u32 amount) +{ + int ret = 0; + u32 target; + + if (amount == 0) + return ret; + + target = rt5677_dsp->mic_read_offset + amount; + /* Copy the first chunk in DSP's mic buffer */ + ret |= rt5677_spi_copy_block(rt5677_dsp, rt5677_dsp->mic_read_offset, + min(target, RT5677_MIC_BUF_BYTES)); + + if (target >= RT5677_MIC_BUF_BYTES) { + /* Wrap around, copy the second chunk */ + target -= RT5677_MIC_BUF_BYTES; + ret |= rt5677_spi_copy_block(rt5677_dsp, 0, target); + } + + if (!ret) + rt5677_dsp->mic_read_offset = target; + return ret; +} + +/* + * A delayed work that streams audio samples from the DSP mic buffer to the + * dma_area of the pcm runtime via SPI. + */ +static void rt5677_spi_copy_work(struct work_struct *work) +{ + struct rt5677_dsp *rt5677_dsp = + container_of(work, struct rt5677_dsp, copy_work.work); + struct snd_pcm_runtime *runtime; + u32 mic_write_offset; + size_t new_bytes, copy_bytes, period_bytes; + unsigned int delay; + int ret = 0; + + /* Ensure runtime->dma_area buffer does not go away while copying. */ + mutex_lock(&rt5677_dsp->dma_lock); + if (!rt5677_dsp->substream) { + dev_err(rt5677_dsp->dev, "No pcm substream\n"); + goto done; + } + + runtime = rt5677_dsp->substream->runtime; + + if (rt5677_spi_mic_write_offset(&mic_write_offset)) { + dev_err(rt5677_dsp->dev, "No mic_write_offset\n"); + goto done; + } + + /* If this is the first time that we've asked for streaming data after + * a hotword is fired, we should start reading from the previous 2 + * seconds of audio from wherever the mic_write_offset is currently. + */ + if (rt5677_dsp->new_hotword) { + rt5677_dsp->new_hotword = false; + /* See if buffer wraparound happens */ + if (mic_write_offset < RT5677_MIC_BUF_FIRST_READ_SIZE) + rt5677_dsp->mic_read_offset = RT5677_MIC_BUF_BYTES - + (RT5677_MIC_BUF_FIRST_READ_SIZE - + mic_write_offset); + else + rt5677_dsp->mic_read_offset = mic_write_offset - + RT5677_MIC_BUF_FIRST_READ_SIZE; + } + + /* Calculate the amount of new samples in bytes */ + if (rt5677_dsp->mic_read_offset <= mic_write_offset) + new_bytes = mic_write_offset - rt5677_dsp->mic_read_offset; + else + new_bytes = RT5677_MIC_BUF_BYTES + mic_write_offset + - rt5677_dsp->mic_read_offset; + + /* Copy all new samples from DSP mic buffer, one period at a time */ + period_bytes = snd_pcm_lib_period_bytes(rt5677_dsp->substream); + while (new_bytes) { + copy_bytes = min(new_bytes, period_bytes + - rt5677_dsp->avail_bytes); + ret = rt5677_spi_copy(rt5677_dsp, copy_bytes); + if (ret) { + dev_err(rt5677_dsp->dev, "Copy failed %d\n", ret); + goto done; + } + rt5677_dsp->avail_bytes += copy_bytes; + if (rt5677_dsp->avail_bytes >= period_bytes) { + snd_pcm_period_elapsed(rt5677_dsp->substream); + rt5677_dsp->avail_bytes = 0; + } + new_bytes -= copy_bytes; + } + + delay = bytes_to_frames(runtime, period_bytes) / (runtime->rate / 1000); + schedule_delayed_work(&rt5677_dsp->copy_work, msecs_to_jiffies(delay)); +done: + mutex_unlock(&rt5677_dsp->dma_lock); +} + +static int rt5677_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 int rt5677_spi_pcm_probe(struct snd_soc_component *component) +{ + struct rt5677_dsp *rt5677_dsp; + + rt5677_dsp = devm_kzalloc(component->dev, sizeof(*rt5677_dsp), + GFP_KERNEL); + if (!rt5677_dsp) + return -ENOMEM; + rt5677_dsp->dev = &g_spi->dev; + mutex_init(&rt5677_dsp->dma_lock); + INIT_DELAYED_WORK(&rt5677_dsp->copy_work, rt5677_spi_copy_work); + + snd_soc_component_set_drvdata(component, rt5677_dsp); + return 0; +} + +static const struct snd_soc_component_driver rt5677_spi_dai_component = { + .name = DRV_NAME, + .probe = rt5677_spi_pcm_probe, + .open = rt5677_spi_pcm_open, + .close = rt5677_spi_pcm_close, + .hw_params = rt5677_spi_hw_params, + .hw_free = rt5677_spi_hw_free, + .prepare = rt5677_spi_prepare, + .pointer = rt5677_spi_pcm_pointer, + .pcm_construct = rt5677_spi_pcm_new, + .legacy_dai_naming = 1, +}; + +/* Select a suitable transfer command for the next transfer to ensure + * the transfer address is always naturally aligned while minimizing + * the total number of transfers required. + * + * 3 transfer commands are available: + * RT5677_SPI_READ/WRITE_16: Transfer 2 bytes + * RT5677_SPI_READ/WRITE_32: Transfer 4 bytes + * RT5677_SPI_READ/WRITE_BURST: Transfer any multiples of 8 bytes + * + * Note: + * 16 Bit writes and reads are restricted to the address range + * 0x18020000 ~ 0x18021000 + * + * For example, reading 256 bytes at 0x60030004 uses the following commands: + * 0x60030004 RT5677_SPI_READ_32 4 bytes + * 0x60030008 RT5677_SPI_READ_BURST 240 bytes + * 0x600300F8 RT5677_SPI_READ_BURST 8 bytes + * 0x60030100 RT5677_SPI_READ_32 4 bytes + * + * Input: + * @read: true for read commands; false for write commands + * @align: alignment of the next transfer address + * @remain: number of bytes remaining to transfer + * + * Output: + * @len: number of bytes to transfer with the selected command + * Returns the selected command + */ +static u8 rt5677_spi_select_cmd(bool read, u32 align, u32 remain, u32 *len) +{ + u8 cmd; + + if (align == 4 || remain <= 4) { + cmd = RT5677_SPI_READ_32; + *len = 4; + } else { + cmd = RT5677_SPI_READ_BURST; + *len = (((remain - 1) >> 3) + 1) << 3; + *len = min_t(u32, *len, RT5677_SPI_BURST_LEN); + } + return read ? cmd : cmd + 1; +} + +/* Copy dstlen bytes from src to dst, while reversing byte order for each word. + * If srclen < dstlen, zeros are padded. + */ +static void rt5677_spi_reverse(u8 *dst, u32 dstlen, const u8 *src, u32 srclen) +{ + u32 w, i, si; + u32 word_size = min_t(u32, dstlen, 8); + + for (w = 0; w < dstlen; w += word_size) { + for (i = 0; i < word_size && i + w < dstlen; i++) { + si = w + word_size - i - 1; + dst[w + i] = si < srclen ? src[si] : 0; + } + } +} + +/* Read DSP address space using SPI. addr and len have to be 4-byte aligned. */ +int rt5677_spi_read(u32 addr, void *rxbuf, size_t len) +{ + u32 offset; + int status = 0; + struct spi_transfer t[2]; + struct spi_message m; + /* +4 bytes is for the DummyPhase following the AddressPhase */ + u8 header[RT5677_SPI_HEADER + 4]; + u8 body[RT5677_SPI_BURST_LEN]; + u8 spi_cmd; + u8 *cb = rxbuf; + + if (!g_spi) + return -ENODEV; + + if ((addr & 3) || (len & 3)) { + dev_err(&g_spi->dev, "Bad read align 0x%x(%zu)\n", addr, len); + return -EACCES; + } + + memset(t, 0, sizeof(t)); + t[0].tx_buf = header; + t[0].len = sizeof(header); + t[0].speed_hz = RT5677_SPI_FREQ; + t[1].rx_buf = body; + t[1].speed_hz = RT5677_SPI_FREQ; + spi_message_init_with_transfers(&m, t, ARRAY_SIZE(t)); + + for (offset = 0; offset < len; offset += t[1].len) { + spi_cmd = rt5677_spi_select_cmd(true, (addr + offset) & 7, + len - offset, &t[1].len); + + /* Construct SPI message header */ + header[0] = spi_cmd; + header[1] = ((addr + offset) & 0xff000000) >> 24; + header[2] = ((addr + offset) & 0x00ff0000) >> 16; + header[3] = ((addr + offset) & 0x0000ff00) >> 8; + header[4] = ((addr + offset) & 0x000000ff) >> 0; + + mutex_lock(&spi_mutex); + status |= spi_sync(g_spi, &m); + mutex_unlock(&spi_mutex); + + + /* Copy data back to caller buffer */ + rt5677_spi_reverse(cb + offset, len - offset, body, t[1].len); + } + return status; +} +EXPORT_SYMBOL_GPL(rt5677_spi_read); + +/* Write DSP address space using SPI. addr has to be 4-byte aligned. + * If len is not 4-byte aligned, then extra zeros are written at the end + * as padding. + */ +int rt5677_spi_write(u32 addr, const void *txbuf, size_t len) +{ + u32 offset; + int status = 0; + struct spi_transfer t; + struct spi_message m; + /* +1 byte is for the DummyPhase following the DataPhase */ + u8 buf[RT5677_SPI_HEADER + RT5677_SPI_BURST_LEN + 1]; + u8 *body = buf + RT5677_SPI_HEADER; + u8 spi_cmd; + const u8 *cb = txbuf; + + if (!g_spi) + return -ENODEV; + + if (addr & 3) { + dev_err(&g_spi->dev, "Bad write align 0x%x(%zu)\n", addr, len); + return -EACCES; + } + + memset(&t, 0, sizeof(t)); + t.tx_buf = buf; + t.speed_hz = RT5677_SPI_FREQ; + spi_message_init_with_transfers(&m, &t, 1); + + for (offset = 0; offset < len;) { + spi_cmd = rt5677_spi_select_cmd(false, (addr + offset) & 7, + len - offset, &t.len); + + /* Construct SPI message header */ + buf[0] = spi_cmd; + buf[1] = ((addr + offset) & 0xff000000) >> 24; + buf[2] = ((addr + offset) & 0x00ff0000) >> 16; + buf[3] = ((addr + offset) & 0x0000ff00) >> 8; + buf[4] = ((addr + offset) & 0x000000ff) >> 0; + + /* Fetch data from caller buffer */ + rt5677_spi_reverse(body, t.len, cb + offset, len - offset); + offset += t.len; + t.len += RT5677_SPI_HEADER + 1; + + mutex_lock(&spi_mutex); + status |= spi_sync(g_spi, &m); + mutex_unlock(&spi_mutex); + } + return status; +} +EXPORT_SYMBOL_GPL(rt5677_spi_write); + +int rt5677_spi_write_firmware(u32 addr, const struct firmware *fw) +{ + return rt5677_spi_write(addr, fw->data, fw->size); +} +EXPORT_SYMBOL_GPL(rt5677_spi_write_firmware); + +void rt5677_spi_hotword_detected(void) +{ + struct rt5677_dsp *rt5677_dsp; + + if (!g_spi) + return; + + rt5677_dsp = dev_get_drvdata(&g_spi->dev); + if (!rt5677_dsp) { + dev_err(&g_spi->dev, "Can't get rt5677_dsp\n"); + return; + } + + mutex_lock(&rt5677_dsp->dma_lock); + dev_info(rt5677_dsp->dev, "Hotword detected\n"); + rt5677_dsp->new_hotword = true; + mutex_unlock(&rt5677_dsp->dma_lock); + + schedule_delayed_work(&rt5677_dsp->copy_work, 0); +} +EXPORT_SYMBOL_GPL(rt5677_spi_hotword_detected); + +static int rt5677_spi_probe(struct spi_device *spi) +{ + int ret; + + g_spi = spi; + + ret = devm_snd_soc_register_component(&spi->dev, + &rt5677_spi_dai_component, + &rt5677_spi_dai, 1); + if (ret < 0) + dev_err(&spi->dev, "Failed to register component.\n"); + + return ret; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id rt5677_spi_acpi_id[] = { + { "RT5677AA", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, rt5677_spi_acpi_id); +#endif + +static struct spi_driver rt5677_spi_driver = { + .driver = { + .name = DRV_NAME, + .acpi_match_table = ACPI_PTR(rt5677_spi_acpi_id), + }, + .probe = rt5677_spi_probe, +}; +module_spi_driver(rt5677_spi_driver); + +MODULE_DESCRIPTION("ASoC RT5677 SPI driver"); +MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>"); +MODULE_LICENSE("GPL v2"); |