2008-07-29 10:42:30 +00:00
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/*
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* Freescale MPC5200 PSC in I2S mode
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* ALSA SoC Digital Audio Interface (DAI) driver
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*
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* Copyright (C) 2008 Secret Lab Technologies Ltd.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/delay.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/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include <sound/soc-of-simple.h>
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#include <sysdev/bestcomm/bestcomm.h>
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#include <sysdev/bestcomm/gen_bd.h>
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#include <asm/mpc52xx_psc.h>
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2009-05-23 23:12:59 +00:00
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#include "mpc5200_dma.h"
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2008-07-29 10:42:30 +00:00
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MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
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MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
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MODULE_LICENSE("GPL");
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/**
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* PSC_I2S_RATES: sample rates supported by the I2S
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*
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* This driver currently only supports the PSC running in I2S slave mode,
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* which means the codec determines the sample rate. Therefore, we tell
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* ALSA that we support all rates and let the codec driver decide what rates
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* are really supported.
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*/
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#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
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SNDRV_PCM_RATE_CONTINUOUS)
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/**
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* PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
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*/
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#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
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SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \
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SNDRV_PCM_FMTBIT_S32_BE)
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static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
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2008-11-18 22:11:38 +00:00
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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2008-07-29 10:42:30 +00:00
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
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u32 mode;
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dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
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" periods=%i buffer_size=%i buffer_bytes=%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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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S8:
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mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
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break;
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case SNDRV_PCM_FORMAT_S16_BE:
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mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
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break;
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case SNDRV_PCM_FORMAT_S24_BE:
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mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
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break;
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case SNDRV_PCM_FORMAT_S32_BE:
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mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
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break;
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default:
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dev_dbg(psc_i2s->dev, "invalid format\n");
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return -EINVAL;
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}
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out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | mode);
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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/**
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* psc_i2s_set_sysclk: set the clock frequency and direction
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*
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* This function is called by the machine driver to tell us what the clock
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* frequency and direction are.
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*
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* Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
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* and we don't care about the frequency. Return an error if the direction
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* is not SND_SOC_CLOCK_IN.
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*
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* @clk_id: reserved, should be zero
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* @freq: the frequency of the given clock ID, currently ignored
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* @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
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*/
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static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
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int clk_id, unsigned int freq, int dir)
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{
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struct psc_i2s *psc_i2s = cpu_dai->private_data;
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dev_dbg(psc_i2s->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
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cpu_dai, dir);
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return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
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}
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/**
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* psc_i2s_set_fmt: set the serial format.
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*
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* This function is called by the machine driver to tell us what serial
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* format to use.
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*
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* This driver only supports I2S mode. Return an error if the format is
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* not SND_SOC_DAIFMT_I2S.
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*
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* @format: one of SND_SOC_DAIFMT_xxx
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*/
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static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
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{
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struct psc_i2s *psc_i2s = cpu_dai->private_data;
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dev_dbg(psc_i2s->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
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cpu_dai, format);
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return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
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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_i2s_dai_template: template CPU Digital Audio Interface
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*/
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2009-03-03 01:41:00 +00:00
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static struct snd_soc_dai_ops psc_i2s_dai_ops = {
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.startup = psc_i2s_startup,
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.hw_params = psc_i2s_hw_params,
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.hw_free = psc_i2s_hw_free,
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.shutdown = psc_i2s_shutdown,
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.trigger = psc_i2s_trigger,
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.set_sysclk = psc_i2s_set_sysclk,
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.set_fmt = psc_i2s_set_fmt,
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};
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2008-07-29 10:42:30 +00:00
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static struct snd_soc_dai psc_i2s_dai_template = {
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = PSC_I2S_RATES,
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.formats = PSC_I2S_FORMATS,
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},
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.capture = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = PSC_I2S_RATES,
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.formats = PSC_I2S_FORMATS,
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},
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2009-03-03 01:41:00 +00:00
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.ops = &psc_i2s_dai_ops,
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2008-07-29 10:42:30 +00:00
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};
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/* ---------------------------------------------------------------------
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* Sysfs attributes for debugging
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*/
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static ssize_t psc_i2s_status_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
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return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x "
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"tfnum=%i tfstat=0x%.4x\n",
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in_be16(&psc_i2s->psc_regs->sr_csr.status),
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in_be32(&psc_i2s->psc_regs->sicr),
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in_be16(&psc_i2s->fifo_regs->rfnum) & 0x1ff,
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in_be16(&psc_i2s->fifo_regs->rfstat),
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in_be16(&psc_i2s->fifo_regs->tfnum) & 0x1ff,
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in_be16(&psc_i2s->fifo_regs->tfstat));
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}
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static int *psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s, const char *name)
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{
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if (strcmp(name, "playback_underrun") == 0)
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return &psc_i2s->stats.underrun_count;
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if (strcmp(name, "capture_overrun") == 0)
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return &psc_i2s->stats.overrun_count;
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return NULL;
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}
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static ssize_t psc_i2s_stat_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
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int *attrib;
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attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
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if (!attrib)
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return 0;
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return sprintf(buf, "%i\n", *attrib);
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}
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static ssize_t psc_i2s_stat_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
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int *attrib;
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attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
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if (!attrib)
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return 0;
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*attrib = simple_strtoul(buf, NULL, 0);
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return count;
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}
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2008-10-30 12:37:09 +00:00
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static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
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static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show,
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psc_i2s_stat_store);
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static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show,
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psc_i2s_stat_store);
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2008-07-29 10:42:30 +00:00
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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 __devinit psc_i2s_of_probe(struct of_device *op,
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const struct of_device_id *match)
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{
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phys_addr_t fifo;
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struct psc_i2s *psc_i2s;
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struct resource res;
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int size, psc_id, irq, rc;
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const __be32 *prop;
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void __iomem *regs;
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dev_dbg(&op->dev, "probing psc i2s device\n");
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/* Get the PSC ID */
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prop = of_get_property(op->node, "cell-index", &size);
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if (!prop || size < sizeof *prop)
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return -ENODEV;
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psc_id = be32_to_cpu(*prop);
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/* Fetch the registers and IRQ of the PSC */
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irq = irq_of_parse_and_map(op->node, 0);
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if (of_address_to_resource(op->node, 0, &res)) {
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dev_err(&op->dev, "Missing reg property\n");
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return -ENODEV;
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}
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regs = ioremap(res.start, 1 + res.end - res.start);
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if (!regs) {
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dev_err(&op->dev, "Could not map registers\n");
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return -ENODEV;
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}
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/* Allocate and initialize the driver private data */
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psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL);
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if (!psc_i2s) {
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iounmap(regs);
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return -ENOMEM;
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}
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spin_lock_init(&psc_i2s->lock);
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psc_i2s->irq = irq;
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psc_i2s->psc_regs = regs;
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psc_i2s->fifo_regs = regs + sizeof *psc_i2s->psc_regs;
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psc_i2s->dev = &op->dev;
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psc_i2s->playback.psc_i2s = psc_i2s;
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psc_i2s->capture.psc_i2s = psc_i2s;
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snprintf(psc_i2s->name, sizeof psc_i2s->name, "PSC%u", psc_id+1);
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/* Fill out the CPU DAI structure */
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memcpy(&psc_i2s->dai, &psc_i2s_dai_template, sizeof psc_i2s->dai);
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psc_i2s->dai.private_data = psc_i2s;
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psc_i2s->dai.name = psc_i2s->name;
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psc_i2s->dai.id = psc_id;
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/* Find the address of the fifo data registers and setup the
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* DMA tasks */
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fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
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psc_i2s->capture.bcom_task =
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bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512);
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psc_i2s->playback.bcom_task =
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bcom_psc_gen_bd_tx_init(psc_id, 10, fifo);
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if (!psc_i2s->capture.bcom_task ||
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!psc_i2s->playback.bcom_task) {
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dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
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iounmap(regs);
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kfree(psc_i2s);
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return -ENODEV;
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}
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/* Disable all interrupts and reset the PSC */
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out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
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out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset transmitter */
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out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset receiver */
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out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
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out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
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/* Configure the serial interface mode; defaulting to CODEC8 mode */
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psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
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MPC52xx_PSC_SICR_CLKPOL;
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if (of_get_property(op->node, "fsl,cellslave", NULL))
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psc_i2s->sicr |= MPC52xx_PSC_SICR_CELLSLAVE |
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MPC52xx_PSC_SICR_GENCLK;
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out_be32(&psc_i2s->psc_regs->sicr,
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psc_i2s->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
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/* Check for the codec handle. If it is not present then we
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* are done */
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if (!of_get_property(op->node, "codec-handle", NULL))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* Set up mode register;
|
|
|
|
* First write: RxRdy (FIFO Alarm) generates rx FIFO irq
|
|
|
|
* Second write: register Normal mode for non loopback
|
|
|
|
*/
|
|
|
|
out_8(&psc_i2s->psc_regs->mode, 0);
|
|
|
|
out_8(&psc_i2s->psc_regs->mode, 0);
|
|
|
|
|
|
|
|
/* Set the TX and RX fifo alarm thresholds */
|
|
|
|
out_be16(&psc_i2s->fifo_regs->rfalarm, 0x100);
|
|
|
|
out_8(&psc_i2s->fifo_regs->rfcntl, 0x4);
|
|
|
|
out_be16(&psc_i2s->fifo_regs->tfalarm, 0x100);
|
|
|
|
out_8(&psc_i2s->fifo_regs->tfcntl, 0x7);
|
|
|
|
|
|
|
|
/* Lookup the IRQ numbers */
|
|
|
|
psc_i2s->playback.irq =
|
|
|
|
bcom_get_task_irq(psc_i2s->playback.bcom_task);
|
|
|
|
psc_i2s->capture.irq =
|
|
|
|
bcom_get_task_irq(psc_i2s->capture.bcom_task);
|
|
|
|
|
|
|
|
/* Save what we've done so it can be found again later */
|
|
|
|
dev_set_drvdata(&op->dev, psc_i2s);
|
|
|
|
|
|
|
|
/* Register the SYSFS files */
|
|
|
|
rc = device_create_file(psc_i2s->dev, &dev_attr_status);
|
2008-10-30 12:37:09 +00:00
|
|
|
rc |= device_create_file(psc_i2s->dev, &dev_attr_capture_overrun);
|
|
|
|
rc |= device_create_file(psc_i2s->dev, &dev_attr_playback_underrun);
|
2008-07-29 10:42:30 +00:00
|
|
|
if (rc)
|
|
|
|
dev_info(psc_i2s->dev, "error creating sysfs files\n");
|
|
|
|
|
2008-12-03 19:58:17 +00:00
|
|
|
snd_soc_register_platform(&psc_i2s_pcm_soc_platform);
|
|
|
|
|
2008-07-29 10:42:30 +00:00
|
|
|
/* Tell the ASoC OF helpers about it */
|
|
|
|
of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform, op->node,
|
|
|
|
&psc_i2s->dai);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __devexit psc_i2s_of_remove(struct of_device *op)
|
|
|
|
{
|
|
|
|
struct psc_i2s *psc_i2s = dev_get_drvdata(&op->dev);
|
|
|
|
|
|
|
|
dev_dbg(&op->dev, "psc_i2s_remove()\n");
|
|
|
|
|
2008-12-03 19:58:17 +00:00
|
|
|
snd_soc_unregister_platform(&psc_i2s_pcm_soc_platform);
|
|
|
|
|
2008-07-29 10:42:30 +00:00
|
|
|
bcom_gen_bd_rx_release(psc_i2s->capture.bcom_task);
|
|
|
|
bcom_gen_bd_tx_release(psc_i2s->playback.bcom_task);
|
|
|
|
|
|
|
|
iounmap(psc_i2s->psc_regs);
|
|
|
|
iounmap(psc_i2s->fifo_regs);
|
|
|
|
kfree(psc_i2s);
|
|
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Match table for of_platform binding */
|
|
|
|
static struct of_device_id psc_i2s_match[] __devinitdata = {
|
|
|
|
{ .compatible = "fsl,mpc5200-psc-i2s", },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, psc_i2s_match);
|
|
|
|
|
|
|
|
static struct of_platform_driver psc_i2s_driver = {
|
|
|
|
.match_table = psc_i2s_match,
|
|
|
|
.probe = psc_i2s_of_probe,
|
|
|
|
.remove = __devexit_p(psc_i2s_of_remove),
|
|
|
|
.driver = {
|
|
|
|
.name = "mpc5200-psc-i2s",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
/* ---------------------------------------------------------------------
|
|
|
|
* Module setup and teardown; simply register the of_platform driver
|
|
|
|
* for the PSC in I2S mode.
|
|
|
|
*/
|
|
|
|
static int __init psc_i2s_init(void)
|
|
|
|
{
|
|
|
|
return of_register_platform_driver(&psc_i2s_driver);
|
|
|
|
}
|
|
|
|
module_init(psc_i2s_init);
|
|
|
|
|
|
|
|
static void __exit psc_i2s_exit(void)
|
|
|
|
{
|
|
|
|
of_unregister_platform_driver(&psc_i2s_driver);
|
|
|
|
}
|
|
|
|
module_exit(psc_i2s_exit);
|
|
|
|
|
|
|
|
|