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