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344 lines
8.8 KiB
344 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip. |
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// |
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// Copyright (C) 2009 Jon Smirl, Digispeaker |
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// Author: Jon Smirl <[email protected]> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/of_platform.h> |
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#include <linux/delay.h> |
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#include <linux/time.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <asm/time.h> |
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#include <asm/delay.h> |
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#include <asm/mpc52xx.h> |
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#include <asm/mpc52xx_psc.h> |
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#include "mpc5200_dma.h" |
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#define DRV_NAME "mpc5200-psc-ac97" |
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/* ALSA only supports a single AC97 device so static is recommend here */ |
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static struct psc_dma *psc_dma; |
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static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg) |
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{ |
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int status; |
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unsigned int val; |
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mutex_lock(&psc_dma->mutex); |
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/* Wait for command send status zero = ready */ |
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status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
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MPC52xx_PSC_SR_CMDSEND), 100, 0); |
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if (status == 0) { |
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pr_err("timeout on ac97 bus (rdy)\n"); |
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mutex_unlock(&psc_dma->mutex); |
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return -ENODEV; |
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} |
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/* Force clear the data valid bit */ |
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in_be32(&psc_dma->psc_regs->ac97_data); |
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/* Send the read */ |
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out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24)); |
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/* Wait for the answer */ |
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status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) & |
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MPC52xx_PSC_SR_DATA_VAL), 100, 0); |
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if (status == 0) { |
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pr_err("timeout on ac97 read (val) %x\n", |
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in_be16(&psc_dma->psc_regs->sr_csr.status)); |
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mutex_unlock(&psc_dma->mutex); |
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return -ENODEV; |
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} |
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/* Get the data */ |
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val = in_be32(&psc_dma->psc_regs->ac97_data); |
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if (((val >> 24) & 0x7f) != reg) { |
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pr_err("reg echo error on ac97 read\n"); |
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mutex_unlock(&psc_dma->mutex); |
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return -ENODEV; |
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} |
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val = (val >> 8) & 0xffff; |
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mutex_unlock(&psc_dma->mutex); |
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return (unsigned short) val; |
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} |
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static void psc_ac97_write(struct snd_ac97 *ac97, |
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unsigned short reg, unsigned short val) |
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{ |
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int status; |
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mutex_lock(&psc_dma->mutex); |
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/* Wait for command status zero = ready */ |
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status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
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MPC52xx_PSC_SR_CMDSEND), 100, 0); |
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if (status == 0) { |
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pr_err("timeout on ac97 bus (write)\n"); |
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goto out; |
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} |
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/* Write data */ |
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out_be32(&psc_dma->psc_regs->ac97_cmd, |
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((reg & 0x7f) << 24) | (val << 8)); |
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out: |
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mutex_unlock(&psc_dma->mutex); |
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} |
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static void psc_ac97_warm_reset(struct snd_ac97 *ac97) |
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{ |
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
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mutex_lock(&psc_dma->mutex); |
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out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR); |
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udelay(3); |
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out_be32(®s->sicr, psc_dma->sicr); |
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mutex_unlock(&psc_dma->mutex); |
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} |
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static void psc_ac97_cold_reset(struct snd_ac97 *ac97) |
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{ |
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
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mutex_lock(&psc_dma->mutex); |
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dev_dbg(psc_dma->dev, "cold reset\n"); |
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mpc5200_psc_ac97_gpio_reset(psc_dma->id); |
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/* Notify the PSC that a reset has occurred */ |
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out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB); |
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/* Re-enable RX and TX */ |
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out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); |
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mutex_unlock(&psc_dma->mutex); |
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usleep_range(1000, 2000); |
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psc_ac97_warm_reset(ac97); |
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} |
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static struct snd_ac97_bus_ops psc_ac97_ops = { |
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.read = psc_ac97_read, |
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.write = psc_ac97_write, |
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.reset = psc_ac97_cold_reset, |
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.warm_reset = psc_ac97_warm_reset, |
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}; |
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static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *cpu_dai) |
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{ |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
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struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
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dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" |
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" periods=%i buffer_size=%i buffer_bytes=%i channels=%i" |
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" rate=%i format=%i\n", |
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__func__, substream, params_period_size(params), |
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params_period_bytes(params), params_periods(params), |
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params_buffer_size(params), params_buffer_bytes(params), |
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params_channels(params), params_rate(params), |
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params_format(params)); |
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/* Determine the set of enable bits to turn on */ |
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s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300; |
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if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE) |
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s->ac97_slot_bits <<= 16; |
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return 0; |
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} |
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static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *cpu_dai) |
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{ |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
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dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream); |
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if (params_channels(params) == 1) |
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out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000); |
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else |
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out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000); |
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return 0; |
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} |
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static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd, |
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struct snd_soc_dai *dai) |
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{ |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai); |
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struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n", |
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substream->pstr->stream); |
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/* Set the slot enable bits */ |
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psc_dma->slots |= s->ac97_slot_bits; |
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out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n", |
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substream->pstr->stream); |
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/* Clear the slot enable bits */ |
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psc_dma->slots &= ~(s->ac97_slot_bits); |
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out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); |
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break; |
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} |
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return 0; |
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} |
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static int psc_ac97_probe(struct snd_soc_dai *cpu_dai) |
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{ |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
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/* Go */ |
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out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); |
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return 0; |
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} |
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/* --------------------------------------------------------------------- |
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* ALSA SoC Bindings |
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* |
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* - Digital Audio Interface (DAI) template |
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* - create/destroy dai hooks |
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*/ |
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/** |
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* psc_ac97_dai_template: template CPU Digital Audio Interface |
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*/ |
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static const struct snd_soc_dai_ops psc_ac97_analog_ops = { |
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.hw_params = psc_ac97_hw_analog_params, |
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.trigger = psc_ac97_trigger, |
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}; |
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static const struct snd_soc_dai_ops psc_ac97_digital_ops = { |
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.hw_params = psc_ac97_hw_digital_params, |
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}; |
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static struct snd_soc_dai_driver psc_ac97_dai[] = { |
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{ |
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.name = "mpc5200-psc-ac97.0", |
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.probe = psc_ac97_probe, |
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.playback = { |
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.stream_name = "AC97 Playback", |
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.channels_min = 1, |
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.channels_max = 6, |
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.rates = SNDRV_PCM_RATE_8000_48000, |
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.formats = SNDRV_PCM_FMTBIT_S32_BE, |
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}, |
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.capture = { |
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.stream_name = "AC97 Capture", |
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.channels_min = 1, |
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.channels_max = 2, |
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.rates = SNDRV_PCM_RATE_8000_48000, |
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.formats = SNDRV_PCM_FMTBIT_S32_BE, |
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}, |
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.ops = &psc_ac97_analog_ops, |
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}, |
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{ |
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.name = "mpc5200-psc-ac97.1", |
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.playback = { |
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.stream_name = "AC97 SPDIF", |
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.channels_min = 1, |
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.channels_max = 2, |
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.rates = SNDRV_PCM_RATE_32000 | \ |
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, |
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.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE, |
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}, |
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.ops = &psc_ac97_digital_ops, |
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} }; |
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static const struct snd_soc_component_driver psc_ac97_component = { |
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.name = DRV_NAME, |
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}; |
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/* --------------------------------------------------------------------- |
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* OF platform bus binding code: |
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* - Probe/remove operations |
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* - OF device match table |
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*/ |
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static int psc_ac97_of_probe(struct platform_device *op) |
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{ |
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int rc; |
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struct mpc52xx_psc __iomem *regs; |
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rc = mpc5200_audio_dma_create(op); |
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if (rc != 0) |
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return rc; |
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rc = snd_soc_set_ac97_ops(&psc_ac97_ops); |
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if (rc != 0) { |
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dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", rc); |
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return rc; |
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} |
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rc = snd_soc_register_component(&op->dev, &psc_ac97_component, |
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psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai)); |
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if (rc != 0) { |
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dev_err(&op->dev, "Failed to register DAI\n"); |
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return rc; |
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} |
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psc_dma = dev_get_drvdata(&op->dev); |
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regs = psc_dma->psc_regs; |
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psc_dma->imr = 0; |
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out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); |
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/* Configure the serial interface mode to AC97 */ |
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psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97; |
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out_be32(®s->sicr, psc_dma->sicr); |
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/* No slots active */ |
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out_be32(®s->ac97_slots, 0x00000000); |
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return 0; |
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} |
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static int psc_ac97_of_remove(struct platform_device *op) |
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{ |
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mpc5200_audio_dma_destroy(op); |
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snd_soc_unregister_component(&op->dev); |
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snd_soc_set_ac97_ops(NULL); |
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return 0; |
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} |
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/* Match table for of_platform binding */ |
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static const struct of_device_id psc_ac97_match[] = { |
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{ .compatible = "fsl,mpc5200-psc-ac97", }, |
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{ .compatible = "fsl,mpc5200b-psc-ac97", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, psc_ac97_match); |
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static struct platform_driver psc_ac97_driver = { |
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.probe = psc_ac97_of_probe, |
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.remove = psc_ac97_of_remove, |
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.driver = { |
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.name = "mpc5200-psc-ac97", |
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.of_match_table = psc_ac97_match, |
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}, |
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}; |
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module_platform_driver(psc_ac97_driver); |
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MODULE_AUTHOR("Jon Smirl <[email protected]>"); |
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MODULE_DESCRIPTION("mpc5200 AC97 module"); |
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MODULE_LICENSE("GPL"); |
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