Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for audio on multifunction CS5535 companion device
 * Copyright (C) Jaya Kumar
 *
 * Based on Jaroslav Kysela and Takashi Iwai's examples.
 * This work was sponsored by CIS(M) Sdn Bhd.
 *
 * todo: add be fmt support, spdif, pm
 */
 
#include <linux/init.h>
#include <linux/pci.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/ac97_codec.h>
#include "cs5535audio.h"
 
static const struct snd_pcm_hardware snd_cs5535audio_playback =
{
<------>.info =			(
<------><------><------><------>SNDRV_PCM_INFO_MMAP |
<------><------><------><------>SNDRV_PCM_INFO_INTERLEAVED |
<------><------> 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
<------><------> 		SNDRV_PCM_INFO_MMAP_VALID |
<------><------> 		SNDRV_PCM_INFO_PAUSE |
<------><------><------><------>SNDRV_PCM_INFO_RESUME
<------><------><------><------>),
<------>.formats =		(
<------><------><------><------>SNDRV_PCM_FMTBIT_S16_LE
<------><------><------><------>),
<------>.rates =		(
<------><------><------><------>SNDRV_PCM_RATE_CONTINUOUS |
<------><------><------><------>SNDRV_PCM_RATE_8000_48000
<------><------><------><------>),
<------>.rate_min =		4000,
<------>.rate_max =		48000,
<------>.channels_min =		2,
<------>.channels_max =		2,
<------>.buffer_bytes_max =	(128*1024),
<------>.period_bytes_min =	64,
<------>.period_bytes_max =	(64*1024 - 16),
<------>.periods_min =		1,
<------>.periods_max =		CS5535AUDIO_MAX_DESCRIPTORS,
<------>.fifo_size =		0,
};
 
static const struct snd_pcm_hardware snd_cs5535audio_capture =
{
<------>.info =			(
<------><------><------><------>SNDRV_PCM_INFO_MMAP |
<------><------><------><------>SNDRV_PCM_INFO_INTERLEAVED |
<------><------> 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
<------><------> 		SNDRV_PCM_INFO_MMAP_VALID
<------><------><------><------>),
<------>.formats =		(
<------><------><------><------>SNDRV_PCM_FMTBIT_S16_LE
<------><------><------><------>),
<------>.rates =		(
<------><------><------><------>SNDRV_PCM_RATE_CONTINUOUS |
<------><------><------><------>SNDRV_PCM_RATE_8000_48000
<------><------><------><------>),
<------>.rate_min =		4000,
<------>.rate_max =		48000,
<------>.channels_min =		2,
<------>.channels_max =		2,
<------>.buffer_bytes_max =	(128*1024),
<------>.period_bytes_min =	64,
<------>.period_bytes_max =	(64*1024 - 16),
<------>.periods_min =		1,
<------>.periods_max =		CS5535AUDIO_MAX_DESCRIPTORS,
<------>.fifo_size =		0,
};
 
static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
{
<------>int err;
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>struct snd_pcm_runtime *runtime = substream->runtime;
 
<------>runtime->hw = snd_cs5535audio_playback;
<------>runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_FRONT_DAC];
<------>snd_pcm_limit_hw_rates(runtime);
<------>cs5535au->playback_substream = substream;
<------>runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
<------>if ((err = snd_pcm_hw_constraint_integer(runtime,
<------><------><------><------>SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
<------><------>return err;
 
<------>return 0;
}
 
static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
{
<------>return 0;
}
 
#define CS5535AUDIO_DESC_LIST_SIZE \
<------>PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
 
static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
<------><------><------><------><------> struct cs5535audio_dma *dma,
<------><------><------><------><------> struct snd_pcm_substream *substream,
<------><------><------><------><------> unsigned int periods,
<------><------><------><------><------> unsigned int period_bytes)
{
<------>unsigned int i;
<------>u32 addr, desc_addr, jmpprd_addr;
<------>struct cs5535audio_dma_desc *lastdesc;
 
<------>if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
<------><------>return -ENOMEM;
 
<------>if (dma->desc_buf.area == NULL) {
<------><------>if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
<------><------><------><------><------>&cs5535au->pci->dev,
<------><------><------><------><------>CS5535AUDIO_DESC_LIST_SIZE+1,
<------><------><------><------><------>&dma->desc_buf) < 0)
<------><------><------>return -ENOMEM;
<------><------>dma->period_bytes = dma->periods = 0;
<------>}
 
<------>if (dma->periods == periods && dma->period_bytes == period_bytes)
<------><------>return 0;
 
<------>/* the u32 cast is okay because in snd*create we successfully told
   	   pci alloc that we're only 32 bit capable so the uppper will be 0 */
<------>addr = (u32) substream->runtime->dma_addr;
<------>desc_addr = (u32) dma->desc_buf.addr;
<------>for (i = 0; i < periods; i++) {
<------><------>struct cs5535audio_dma_desc *desc =
<------><------><------>&((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
<------><------>desc->addr = cpu_to_le32(addr);
<------><------>desc->size = cpu_to_le16(period_bytes);
<------><------>desc->ctlreserved = cpu_to_le16(PRD_EOP);
<------><------>desc_addr += sizeof(struct cs5535audio_dma_desc);
<------><------>addr += period_bytes;
<------>}
<------>/* we reserved one dummy descriptor at the end to do the PRD jump */
<------>lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
<------>lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
<------>lastdesc->size = 0;
<------>lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
<------>jmpprd_addr = (u32)dma->desc_buf.addr +
<------><------>sizeof(struct cs5535audio_dma_desc) * periods;
 
<------>dma->substream = substream;
<------>dma->period_bytes = period_bytes;
<------>dma->periods = periods;
<------>spin_lock_irq(&cs5535au->reg_lock);
<------>dma->ops->disable_dma(cs5535au);
<------>dma->ops->setup_prd(cs5535au, jmpprd_addr);
<------>spin_unlock_irq(&cs5535au->reg_lock);
<------>return 0;
}
 
static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
{
<------>cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
}
 
static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
{
<------>cs_writeb(cs5535au, ACC_BM0_CMD, 0);
}
 
static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
{
<------>cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
}
 
static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
<------><------><------><------><------>   u32 prd_addr)
{
<------>cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
}
 
static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
{
<------>return cs_readl(cs5535au, ACC_BM0_PRD);
}
 
static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
{
<------>return cs_readl(cs5535au, ACC_BM0_PNTR);
}
 
static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
{
<------>cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
}
 
static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
{
<------>cs_writeb(cs5535au, ACC_BM1_CMD, 0);
}
 
static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
{
<------>cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
}
 
static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
<------><------><------><------><------>  u32 prd_addr)
{
<------>cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
}
 
static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
{
<------>return cs_readl(cs5535au, ACC_BM1_PRD);
}
 
static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
{
<------>return cs_readl(cs5535au, ACC_BM1_PNTR);
}
 
static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
<------><------><------><------><------>  struct cs5535audio_dma *dma,
<------><------><------><------><------>  struct snd_pcm_substream *substream)
{
<------>snd_dma_free_pages(&dma->desc_buf);
<------>dma->desc_buf.area = NULL;
<------>dma->substream = NULL;
}
 
static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
<------><------><------><------>     struct snd_pcm_hw_params *hw_params)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>struct cs5535audio_dma *dma = substream->runtime->private_data;
<------>int err;
 
<------>dma->buf_addr = substream->runtime->dma_addr;
<------>dma->buf_bytes = params_buffer_bytes(hw_params);
 
<------>err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
<------><------><------><------><------>    params_periods(hw_params),
<------><------><------><------><------>    params_period_bytes(hw_params));
<------>if (!err)
<------><------>dma->pcm_open_flag = 1;
 
<------>return err;
}
 
static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>struct cs5535audio_dma *dma = substream->runtime->private_data;
 
<------>if (dma->pcm_open_flag) {
<------><------>if (substream == cs5535au->playback_substream)
<------><------><------>snd_ac97_update_power(cs5535au->ac97,
<------><------><------><------><------>AC97_PCM_FRONT_DAC_RATE, 0);
<------><------>else
<------><------><------>snd_ac97_update_power(cs5535au->ac97,
<------><------><------><------><------>AC97_PCM_LR_ADC_RATE, 0);
<------><------>dma->pcm_open_flag = 0;
<------>}
<------>cs5535audio_clear_dma_packets(cs5535au, dma, substream);
<------>return 0;
}
 
static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
<------><------><------><------> substream->runtime->rate);
}
 
static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>struct cs5535audio_dma *dma = substream->runtime->private_data;
<------>int err = 0;
 
<------>spin_lock(&cs5535au->reg_lock);
<------>switch (cmd) {
<------>case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
<------><------>dma->ops->pause_dma(cs5535au);
<------><------>break;
<------>case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
<------><------>dma->ops->enable_dma(cs5535au);
<------><------>break;
<------>case SNDRV_PCM_TRIGGER_START:
<------><------>dma->ops->enable_dma(cs5535au);
<------><------>break;
<------>case SNDRV_PCM_TRIGGER_RESUME:
<------><------>dma->ops->enable_dma(cs5535au);
<------><------>break;
<------>case SNDRV_PCM_TRIGGER_STOP:
<------><------>dma->ops->disable_dma(cs5535au);
<------><------>break;
<------>case SNDRV_PCM_TRIGGER_SUSPEND:
<------><------>dma->ops->disable_dma(cs5535au);
<------><------>break;
<------>default:
<------><------>dev_err(cs5535au->card->dev, "unhandled trigger\n");
<------><------>err = -EINVAL;
<------><------>break;
<------>}
<------>spin_unlock(&cs5535au->reg_lock);
<------>return err;
}
 
static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
<------><------><------><------><------><------><------>*substream)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>u32 curdma;
<------>struct cs5535audio_dma *dma;
 
<------>dma = substream->runtime->private_data;
<------>curdma = dma->ops->read_dma_pntr(cs5535au);
<------>if (curdma < dma->buf_addr) {
<------><------>dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
<------><------><------><------><------>curdma, dma->buf_addr);
<------><------>return 0;
<------>}
<------>curdma -= dma->buf_addr;
<------>if (curdma >= dma->buf_bytes) {
<------><------>dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
<------><------><------><------><------>curdma, dma->buf_bytes);
<------><------>return 0;
<------>}
<------>return bytes_to_frames(substream->runtime, curdma);
}
 
static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
{
<------>int err;
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>struct snd_pcm_runtime *runtime = substream->runtime;
 
<------>runtime->hw = snd_cs5535audio_capture;
<------>runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
<------>snd_pcm_limit_hw_rates(runtime);
<------>cs5535au->capture_substream = substream;
<------>runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
<------>if ((err = snd_pcm_hw_constraint_integer(runtime,
<------><------><------><------><------> SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
<------><------>return err;
<------>olpc_capture_open(cs5535au->ac97);
<------>return 0;
}
 
static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>olpc_capture_close(cs5535au->ac97);
<------>return 0;
}
 
static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
{
<------>struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
<------>return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
<------><------><------><------> substream->runtime->rate);
}
 
static const struct snd_pcm_ops snd_cs5535audio_playback_ops = {
<------>.open =		snd_cs5535audio_playback_open,
<------>.close =	snd_cs5535audio_playback_close,
<------>.hw_params =	snd_cs5535audio_hw_params,
<------>.hw_free =	snd_cs5535audio_hw_free,
<------>.prepare =	snd_cs5535audio_playback_prepare,
<------>.trigger =	snd_cs5535audio_trigger,
<------>.pointer =	snd_cs5535audio_pcm_pointer,
};
 
static const struct snd_pcm_ops snd_cs5535audio_capture_ops = {
<------>.open =		snd_cs5535audio_capture_open,
<------>.close =	snd_cs5535audio_capture_close,
<------>.hw_params =	snd_cs5535audio_hw_params,
<------>.hw_free =	snd_cs5535audio_hw_free,
<------>.prepare =	snd_cs5535audio_capture_prepare,
<------>.trigger =	snd_cs5535audio_trigger,
<------>.pointer =	snd_cs5535audio_pcm_pointer,
};
 
static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
        .type = CS5535AUDIO_DMA_PLAYBACK,
        .enable_dma = cs5535audio_playback_enable_dma,
        .disable_dma = cs5535audio_playback_disable_dma,
        .setup_prd = cs5535audio_playback_setup_prd,
        .read_prd = cs5535audio_playback_read_prd,
        .pause_dma = cs5535audio_playback_pause_dma,
        .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
};
 
static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
        .type = CS5535AUDIO_DMA_CAPTURE,
        .enable_dma = cs5535audio_capture_enable_dma,
        .disable_dma = cs5535audio_capture_disable_dma,
        .setup_prd = cs5535audio_capture_setup_prd,
        .read_prd = cs5535audio_capture_read_prd,
        .pause_dma = cs5535audio_capture_pause_dma,
        .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
};
 
int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
{
<------>struct snd_pcm *pcm;
<------>int err;
 
<------>err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
<------>if (err < 0)
<------><------>return err;
 
<------>cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
<------><------><------><------><------>&snd_cs5535audio_playback_dma_ops;
<------>cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
<------><------><------><------><------>&snd_cs5535audio_capture_dma_ops;
<------>snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
<------><------><------><------><------>&snd_cs5535audio_playback_ops);
<------>snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
<------><------><------><------><------>&snd_cs5535audio_capture_ops);
 
<------>pcm->private_data = cs5535au;
<------>pcm->info_flags = 0;
<------>strcpy(pcm->name, "CS5535 Audio");
 
<------>snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
<------><------><------><------>       &cs5535au->pci->dev,
<------><------><------><------>       64*1024, 128*1024);
<------>cs5535au->pcm = pcm;
 
<------>return 0;
}