[alsa-devel] [PATCH 2/3] ALSA SoC: Add mpc5200-psc I2S driver

Jon Smirl jonsmirl at gmail.com
Wed Jul 2 17:19:18 CEST 2008


On 7/1/08, Grant Likely <grant.likely at secretlab.ca> wrote:
> From: Grant Likely <grant.likely at secretlab.ca>
>
>  This is an I2S bus driver for the MPC5200 PSC device.  It is probably
>  will not be merged as-is because it uses v1 of the ASoC API, but I want
>  to get it out there for comments.
>  ---
>
>   sound/soc/fsl/Kconfig           |    6
>   sound/soc/fsl/Makefile          |    2
>   sound/soc/fsl/mpc5200_psc_i2s.c |  899 +++++++++++++++++++++++++++++++++++++++
>   3 files changed, 907 insertions(+), 0 deletions(-)
>
>  diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
>  index 257101f..5daa8d3 100644
>  --- a/sound/soc/fsl/Kconfig
>  +++ b/sound/soc/fsl/Kconfig
>  @@ -17,4 +17,10 @@ config SND_SOC_MPC8610_HPCD
>         help
>           Say Y if you want to enable audio on the Freescale MPC8610 HPCD.
>
>  +config SND_SOC_MPC5200_I2S
>  +       bool "Freescale MPC5200 PSC in I2S mode driver"
>  +       depends on SND_SOC && PPC_MPC52xx
>  +       help
>  +         Say Y here to support the MPC5200 PSCs in I2S mode.
>  +
>   endmenu
>  diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
>  index 62f680a..98729a1 100644
>  --- a/sound/soc/fsl/Makefile
>  +++ b/sound/soc/fsl/Makefile
>  @@ -4,3 +4,5 @@ obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += mpc8610_hpcd.o
>   # MPC8610 Platform Support
>   obj-$(CONFIG_SND_SOC_MPC8610) += fsl_ssi.o fsl_dma.o
>
>  +obj-$(CONFIG_SND_SOC_MPC5200_I2S) += mpc5200_psc_i2s.o
>  +
>  diff --git a/sound/soc/fsl/mpc5200_psc_i2s.c b/sound/soc/fsl/mpc5200_psc_i2s.c
>  new file mode 100644
>  index 0000000..81d0933
>  --- /dev/null
>  +++ b/sound/soc/fsl/mpc5200_psc_i2s.c
>  @@ -0,0 +1,899 @@
>  +/*
>  + * Freescale MPC5200 PSC in I2S mode
>  + * ALSA SoC Digital Audio Interface (DAI) driver
>  + *
>  + * Copyright (C) 2008 Secret Lab Technologies Ltd.
>  + */
>  +
>  +#include <linux/init.h>
>  +#include <linux/module.h>
>  +#include <linux/interrupt.h>
>  +#include <linux/device.h>
>  +#include <linux/delay.h>
>  +#include <linux/of_device.h>
>  +#include <linux/of_platform.h>
>  +#include <linux/dma-mapping.h>
>  +
>  +#include <sound/core.h>
>  +#include <sound/pcm.h>
>  +#include <sound/pcm_params.h>
>  +#include <sound/initval.h>
>  +#include <sound/soc.h>
>  +#include <sound/soc-of.h>
>  +
>  +#include <sysdev/bestcomm/bestcomm.h>
>  +#include <sysdev/bestcomm/gen_bd.h>
>  +#include <asm/mpc52xx_psc.h>
>  +
>  +MODULE_AUTHOR("Grant Likely <grant.likely at secretlab.ca>");
>  +MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
>  +MODULE_LICENSE("GPL");
>  +
>  +/**
>  + * PSC_I2S_RATES: sample rates supported by the I2S
>  + *
>  + * This driver currently only supports the PSC running in I2S slave mode,
>  + * which means the codec determines the sample rate.  Therefore, we tell
>  + * ALSA that we support all rates and let the codec driver decide what rates
>  + * are really supported.
>  + */
>  +#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
>  +                       SNDRV_PCM_RATE_CONTINUOUS)
>  +
>  +/**
>  + * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
>  + */
>  +#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
>  +                        SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \
>  +                        SNDRV_PCM_FMTBIT_S32_BE)
>  +
>  +/**
>  + * psc_i2s_stream - Data specific to a single stream (playback or capture)
>  + * @active:            flag indicating if the stream is active
>  + * @psc_i2s:           pointer back to parent psc_i2s data structure
>  + * @bcom_task:         bestcomm task structure
>  + * @irq:               irq number for bestcomm task
>  + * @period_start:      physical address of start of DMA region
>  + * @period_end:                physical address of end of DMA region
>  + * @period_next_pt:    physical address of next DMA buffer to enqueue
>  + * @period_bytes:      size of DMA period in bytes
>  + */
>  +struct psc_i2s_stream {
>  +       int active;
>  +       struct psc_i2s *psc_i2s;
>  +       struct bcom_task *bcom_task;
>  +       int irq;
>  +       struct snd_pcm_substream *stream;
>  +       dma_addr_t period_start;
>  +       dma_addr_t period_end;
>  +       dma_addr_t period_next_pt;
>  +       dma_addr_t period_current_pt;
>  +       int period_bytes;
>  +};
>  +
>  +/**
>  + * psc_i2s - Private driver data
>  + * @name: short name for this device ("PSC0", "PSC1", etc)
>  + * @psc_regs: pointer to the PSC's registers
>  + * @fifo_regs: pointer to the PSC's FIFO registers
>  + * @irq: IRQ of this PSC
>  + * @dev: struct device pointer
>  + * @playback: the number of playback streams opened
>  + * @capture: the number of capture streams opened
>  + * @dai: the CPU DAI for this device
>  + * @playback_stream: Playback stream context data
>  + * @capture_stream: Capture stream context data
>  + */
>  +struct psc_i2s {
>  +       char name[32];
>  +       struct mpc52xx_psc __iomem *psc_regs;
>  +       struct mpc52xx_psc_fifo __iomem *fifo_regs;
>  +       unsigned int irq;
>  +       struct device *dev;
>  +       struct snd_soc_cpu_dai dai;
>  +       spinlock_t lock;
>  +
>  +       /* per-stream data */
>  +       struct psc_i2s_stream playback_stream;
>  +       struct psc_i2s_stream capture_stream;
>  +
>  +       /* Statistics */
>  +       struct {
>  +               int overrun_count;
>  +               int underrun_count;
>  +       } stats;
>  +};
>  +
>  +/*
>  + * Interrupt handlers
>  + */
>  +static irqreturn_t psc_i2s_status_irq(int irq, void *_psc_i2s)
>  +{
>  +       struct psc_i2s *psc_i2s = _psc_i2s;
>  +       struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
>  +       u16 imr;
>  +       u16 isr;
>  +
>  +       isr = in_be16(&regs->mpc52xx_psc_isr);
>  +       imr = in_be16(&regs->mpc52xx_psc_imr);
>  +
>  +       /* Playback underrun error */
>  +       if (isr & imr & MPC52xx_PSC_IMR_TXEMP)
>  +               psc_i2s->stats.underrun_count++;
>  +
>  +       /* Capture overrun error */
>  +       if (isr & imr & MPC52xx_PSC_IMR_ORERR)
>  +               psc_i2s->stats.overrun_count++;
>  +
>  +       out_8(&regs->command, 4 << 4);  /* reset the error status */
>  +
>  +       return IRQ_HANDLED;
>  +}
>  +
>  +/**
>  + * psc_i2s_bcom_enqueue_next_buffer - Enqueue another audio buffer
>  + * @s: pointer to stream private data structure
>  + *
>  + * Enqueues another audio period buffer into the bestcomm queue.
>  + *
>  + * Note: The routine must only be called when there is space available in
>  + * the queue.  Otherwise the enqueue will fail and the audio ring buffer
>  + * will get out of sync
>  + */
>  +static void psc_i2s_bcom_enqueue_next_buffer(struct psc_i2s_stream *s)
>  +{
>  +       struct bcom_bd *bd;
>  +
>  +       /* Prepare and enqueue the next buffer descriptor */
>  +       bd = bcom_prepare_next_buffer(s->bcom_task);
>  +       bd->status = s->period_bytes;
>  +       bd->data[0] = s->period_next_pt;
>  +       bcom_submit_next_buffer(s->bcom_task, NULL);
>  +
>  +       /* Update for next period */
>  +       s->period_next_pt += s->period_bytes;
>  +       if (s->period_next_pt >= s->period_end)
>  +               s->period_next_pt = s->period_start;
>  +}
>  +
>  +/* Bestcomm DMA irq handler */
>  +static irqreturn_t psc_i2s_bcom_irq(int irq, void *_psc_i2s_stream)
>  +{
>  +       struct psc_i2s_stream *s = _psc_i2s_stream;
>  +
>  +       //spin_lock(&s->psc_i2s->lock);
>  +
>  +       /* For each finished period, dequeue the completed period buffer
>  +        * and enqueue a new one in it's place. */
>  +       while (bcom_buffer_done(s->bcom_task)) {
>  +               bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
>  +               s->period_current_pt += s->period_bytes;
>  +               if (s->period_current_pt >= s->period_end)
>  +                       s->period_current_pt = s->period_start;
>  +               psc_i2s_bcom_enqueue_next_buffer(s);
>  +               bcom_enable(s->bcom_task);
>  +       }
>  +
>  +       //spin_unlock(&s->psc_i2s->lock);
>  +
>  +       /* If the stream is active, then also inform the PCM middle layer
>  +        * of the period finished event. */
>  +       if (s->active)
>  +               snd_pcm_period_elapsed(s->stream);
>  +
>  +       return IRQ_HANDLED;
>  +}
>  +
>  +/**
>  + * psc_i2s_startup: create a new substream
>  + *
>  + * This is the first function called when a stream is opened.
>  + *
>  + * If this is the first stream open, then grab the IRQ and program most of
>  + * the PSC registers.
>  + */
>  +static int psc_i2s_startup(struct snd_pcm_substream *substream)
>  +{
>  +       int playback_irq, capture_irq, rc;
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +       struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
>  +       struct mpc52xx_psc_fifo __iomem *fiforegs = psc_i2s->fifo_regs;
>  +
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream);
>  +
>  +       /* Disable all interrupts and reset the PSC */
>  +       out_be16(&regs->mpc52xx_psc_imr, 0);
>  +       out_8(&regs->command, 3 << 4); /* reset transmitter */
>  +       out_8(&regs->command, 2 << 4); /* reset receiver */
>  +       out_8(&regs->command, 1 << 4); /* reset mode */
>  +       out_8(&regs->command, 4 << 4); /* reset error */
>  +
>  +       /* Default to CODEC8 mode */
>  +       out_be32(&regs->sicr,
>  +                MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
>  +                MPC52xx_PSC_SICR_CLKPOL | MPC52xx_PSC_SICR_SIM_CODEC_8);
>  +
>  +       /* First write: RxRdy (FIFO Alarm) generates receive FIFO interrupt */
>  +       /* Second write to mode: register Normal mode for non loopback */
>  +       out_8(&regs->mode, 0);
>  +       out_8(&regs->mode, 0);
>  +
>  +       /* Set the TX and RX fifo alarm thresholds */
>  +       out_be16(&fiforegs->rfalarm, 0x100);    /* set RFALARM level */
>  +       out_8(&fiforegs->rfcntl, 0x4);          /* set RFGRAN level (bytes) */
>  +       out_be16(&fiforegs->tfalarm, 0x100);    /* set TFALARM level */
>  +       out_8(&fiforegs->tfcntl, 0x7);          /* set TFGRAN level (bytes*4) */
>  +
>  +       /* Setup the IRQs */
>  +       playback_irq = bcom_get_task_irq(psc_i2s->playback_stream.bcom_task);
>  +       capture_irq = bcom_get_task_irq(psc_i2s->capture_stream.bcom_task);
>  +       rc = request_irq(psc_i2s->irq, &psc_i2s_status_irq, IRQF_SHARED,
>  +                        "psc-i2s-status", psc_i2s);
>  +       rc |= request_irq(capture_irq, &psc_i2s_bcom_irq, IRQF_SHARED,
>  +                         "psc-i2s-capture", &psc_i2s->capture_stream);
>  +       rc |= request_irq(playback_irq, &psc_i2s_bcom_irq, IRQF_SHARED,
>  +                         "psc-i2s-playback", &psc_i2s->playback_stream);
>  +       if (rc) {
>  +               free_irq(psc_i2s->irq, psc_i2s);
>  +               free_irq(capture_irq, &psc_i2s->capture_stream);
>  +               free_irq(playback_irq, &psc_i2s->playback_stream);
>  +               return -ENODEV;
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
>  +                                struct snd_pcm_hw_params *params)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +       u32 sicr;
>  +
>  +       dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
>  +               " periods=%i buffer_size=%i  buffer_bytes=%i\n",
>  +               __FUNCTION__, substream, params_period_size(params),
>  +               params_period_bytes(params), params_periods(params),
>  +               params_buffer_size(params), params_buffer_bytes(params));
>  +
>  +       sicr = MPC52xx_PSC_SICR_DTS1 |
>  +              MPC52xx_PSC_SICR_I2S | MPC52xx_PSC_SICR_CLKPOL;
>  +       switch (params_format(params)) {
>  +        case SNDRV_PCM_FORMAT_S8:
>  +               sicr |= MPC52xx_PSC_SICR_SIM_CODEC_8;
>  +               break;
>  +        case SNDRV_PCM_FORMAT_S16_BE:
>  +               sicr |= MPC52xx_PSC_SICR_SIM_CODEC_16;
>  +               break;
>  +        case SNDRV_PCM_FORMAT_S24_BE:
>  +               sicr |= MPC52xx_PSC_SICR_SIM_CODEC_24;
>  +               break;
>  +        case SNDRV_PCM_FORMAT_S32_BE:
>  +               sicr |= MPC52xx_PSC_SICR_SIM_CODEC_32;
>  +               break;
>  +        default:
>  +               dev_dbg(psc_i2s->dev, "invalid format\n");
>  +               return -EINVAL;
>  +       }
>  +       out_be32(&psc_i2s->psc_regs->sicr, sicr);
>  +
>  +       //rc = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
>  +       //if (rc) {
>  +       //      dev_err(psc_i2s->dev, "could not allocate dma buffer\n");
>  +       //      return rc;
>  +       //}
>  +
>  +       snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
>  +
>  +       return 0;
>  +}
>  +
>  +static int psc_i2s_hw_free(struct snd_pcm_substream *substream)
>  +{
>  +       //return snd_pcm_lib_free_pages(substream);
>  +       snd_pcm_set_runtime_buffer(substream, NULL);
>  +       return 0;
>  +}
>  +
>  +/**
>  + * psc_i2s_trigger: start and stop the DMA transfer.
>  + *
>  + * This function is called by ALSA to start, stop, pause, and resume the DMA
>  + * transfer of data.
>  + */
>  +static int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +       struct snd_pcm_runtime *runtime = substream->runtime;
>  +       struct psc_i2s_stream *s;
>  +       struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
>  +       u16 imr;
>  +       u8 psc_cmd;
>  +       long flags;
>  +
>  +       if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
>  +               s = &psc_i2s->capture_stream;
>  +       else
>  +               s = &psc_i2s->playback_stream;
>  +
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_trigger(substream=%p, cmd=%i)"
>  +               " stream_id=%i\n",
>  +               substream, cmd, substream->pstr->stream);
>  +
>  +       switch (cmd) {
>  +        case SNDRV_PCM_TRIGGER_START:
>  +               s->period_bytes = frames_to_bytes(runtime,
>  +                                                 runtime->period_size);
>  +               s->period_start = virt_to_phys(runtime->dma_area);
>  +               s->period_end = s->period_start +
>  +                               (s->period_bytes * runtime->periods);
>  +               s->period_next_pt = s->period_start;
>  +               s->period_current_pt = s->period_start;
>  +               s->active = 1;
>  +
>  +               /* First; reset everything */
>  +               if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
>  +                       out_8(&regs->command, MPC52xx_PSC_RST_RX);
>  +                       out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
>  +               } else {
>  +                       out_8(&regs->command, MPC52xx_PSC_RST_TX);
>  +                       out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
>  +               }
>  +
>  +               /* Next, fill up the bestcomm bd queue and enable DMA.
>  +                * This will begin filling the PSC's fifo. */
>  +               if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
>  +                       bcom_gen_bd_rx_reset(s->bcom_task);
>  +               else
>  +                       bcom_gen_bd_tx_reset(s->bcom_task);
>  +               while (!bcom_queue_full(s->bcom_task))
>  +                       psc_i2s_bcom_enqueue_next_buffer(s);
>  +               bcom_enable(s->bcom_task);
>  +
>  +               /* Update interrupt enable settings.  This must be done
>  +                * before the PSC is enabled so that TX underrun events
>  +                * are not missed. */
>  +               imr = 0;
>  +               if (psc_i2s->playback_stream.active)
>  +                       imr |= MPC52xx_PSC_IMR_TXEMP;
>  +               if (psc_i2s->capture_stream.active)
>  +                       imr |= MPC52xx_PSC_IMR_ORERR;
>  +               out_be16(&regs->isr_imr.imr, imr);
>  +
>  +               /* Due to errata in the i2s mode; need to line up enabling
>  +                * the transmitter with a transition on the frame sync
>  +                * line */
>  +
>  +               spin_lock_irqsave(&psc_i2s->lock, flags);
>  +               /* first make sure it is low */
>  +               while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0);

Could this be moved to the front of the routine, to increase parallelism?

Once you detect the 0, it will be a fixed interval before the 1
happens. Might as well overlap the computations.

>  +               /* then wait for the transition to high */
>  +               while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0);
>  +               /* Finally, enable the PSC.
>  +                * Receiver must always be enabled; even when we only want
>  +                * transmit.  (see 15.3.2.3 of MPC5200B User's Guide) */
>  +               psc_cmd = MPC52xx_PSC_RX_ENABLE;
>  +               if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
>  +                       psc_cmd |= MPC52xx_PSC_TX_ENABLE;
>  +               out_8(&regs->command, psc_cmd);
>  +               spin_unlock_irqrestore(&psc_i2s->lock, flags);
>  +
>  +               break;
>  +
>  +        case SNDRV_PCM_TRIGGER_STOP:
>  +               /* Turn off the PSC */
>  +               s->active = 0;
>  +               if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
>  +                       if (!psc_i2s->playback_stream.active) {
>  +                               out_8(&regs->command, 2 << 4);  /* reset rx */
>  +                               out_8(&regs->command, 3 << 4);  /* reset tx */
>  +                               out_8(&regs->command, 4 << 4);  /* reset err */
>  +                       }
>  +               } else {
>  +                       out_8(&regs->command, 3 << 4);  /* reset tx */
>  +                       out_8(&regs->command, 4 << 4);  /* reset err */
>  +                       if (!psc_i2s->capture_stream.active)
>  +                               out_8(&regs->command, 2 << 4);  /* reset rx */
>  +               }
>  +
>  +               bcom_disable(s->bcom_task);
>  +               while (!bcom_queue_empty(s->bcom_task))
>  +                       bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
>  +
>  +               break;
>  +
>  +        default:
>  +               dev_dbg(psc_i2s->dev, "invalid command\n");
>  +               return -EINVAL;
>  +       }
>  +
>  +       /* Update interrupt enable settings */
>  +       imr = 0;
>  +       if (psc_i2s->playback_stream.active) imr |= MPC52xx_PSC_IMR_TXEMP;
>  +       if (psc_i2s->capture_stream.active) imr |= MPC52xx_PSC_IMR_ORERR;
>  +       out_be16(&regs->isr_imr.imr, imr);
>  +
>  +       return 0;
>  +}
>  +
>  +/**
>  + * psc_i2s_shutdown: shutdown the data transfer on a stream
>  + *
>  + * Shutdown the PSC if there are no other substreams open.
>  + */
>  +static void psc_i2s_shutdown(struct snd_pcm_substream *substream)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_shutdown(substream=%p)\n", substream);
>  +
>  +       /*
>  +        * If this is the last active substream, disable the PSC and release
>  +        * the IRQ.
>  +        */
>  +       if (!psc_i2s->playback_stream.active &&
>  +           !psc_i2s->capture_stream.active) {
>  +               /* TODO: shut off channels */
>  +               free_irq(psc_i2s->irq, psc_i2s);
>  +               free_irq(bcom_get_task_irq(psc_i2s->capture_stream.bcom_task),
>  +                        &psc_i2s->capture_stream);
>  +               free_irq(bcom_get_task_irq(psc_i2s->playback_stream.bcom_task),
>  +                        &psc_i2s->playback_stream);
>  +       }
>  +}
>  +
>  +/**
>  + * psc_i2s_set_sysclk: set the clock frequency and direction
>  + *
>  + * This function is called by the machine driver to tell us what the clock
>  + * frequency and direction are.
>  + *
>  + * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
>  + * and we don't care about the frequency.  Return an error if the direction
>  + * is not SND_SOC_CLOCK_IN.
>  + *
>  + * @clk_id: reserved, should be zero
>  + * @freq: the frequency of the given clock ID, currently ignored
>  + * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
>  + */
>  +static int psc_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai,
>  +                             int clk_id, unsigned int freq, int dir)
>  +{
>  +       struct psc_i2s *psc_i2s = cpu_dai->private_data;
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
>  +                               cpu_dai, dir);
>  +       return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
>  +}
>  +
>  +/**
>  + * psc_i2s_set_fmt: set the serial format.
>  + *
>  + * This function is called by the machine driver to tell us what serial
>  + * format to use.
>  + *
>  + * This driver only supports I2S mode.  Return an error if the format is
>  + * not SND_SOC_DAIFMT_I2S.
>  + *
>  + * @format: one of SND_SOC_DAIFMT_xxx
>  + */
>  +static int psc_i2s_set_fmt(struct snd_soc_cpu_dai *cpu_dai, unsigned int format)
>  +{
>  +       struct psc_i2s *psc_i2s = cpu_dai->private_data;
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
>  +                               cpu_dai, format);
>  +       return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
>  +}
>  +
>  +/* ---------------------------------------------------------------------
>  + * ALSA SoC Bindings
>  + *
>  + * - Digital Audio Interface (DAI) template
>  + * - create/destroy dai hooks
>  + */
>  +
>  +/**
>  + * psc_i2s_dai_template: template CPU Digital Audio Interface
>  + */
>  +static struct snd_soc_cpu_dai psc_i2s_dai_template = {
>  +       .type = SND_SOC_DAI_I2S,
>  +       .playback = {
>  +               .channels_min = 2,
>  +               .channels_max = 2,
>  +               .rates = PSC_I2S_RATES,
>  +               .formats = PSC_I2S_FORMATS,
>  +       },
>  +       .capture = {
>  +               .channels_min = 2,
>  +               .channels_max = 2,
>  +               .rates = PSC_I2S_RATES,
>  +               .formats = PSC_I2S_FORMATS,
>  +       },
>  +       .ops = {
>  +               .startup = psc_i2s_startup,
>  +               .hw_params = psc_i2s_hw_params,
>  +               .hw_free = psc_i2s_hw_free,
>  +               .shutdown = psc_i2s_shutdown,
>  +               .trigger = psc_i2s_trigger,
>  +       },
>  +       .dai_ops = {
>  +               .set_sysclk = psc_i2s_set_sysclk,
>  +               .set_fmt = psc_i2s_set_fmt,
>  +       },
>  +};
>  +
>  +/* ---------------------------------------------------------------------
>  + * The PSC I2S 'ASoC platform' driver
>  + *
>  + * Can be referenced by an 'ASoC machine' driver
>  + * This driver only deals with the audio bus; it doesn't have any
>  + * interaction with the attached codec
>  + */
>  +
>  +static const struct snd_pcm_hardware psc_i2s_pcm_hardware = {
>  +       .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
>  +               SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER,
>  +       .formats = SNDRV_PCM_FMTBIT_S8 |SNDRV_PCM_FMTBIT_S16_BE |
>  +                  SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
>  +       .rate_min = 8000,
>  +       .rate_max = 48000,
>  +       .channels_min = 2,
>  +       .channels_max = 2,
>  +       .period_bytes_max       = 1024 * 1024,
>  +       .period_bytes_min       = 32,
>  +       .period_bytes_max       = 1024 * 1024,
>  +       .periods_min            = 2,
>  +       .periods_max            = 256,
>  +       .buffer_bytes_max       = 2 * 1024 * 1024,
>  +       .fifo_size              = 0,
>  +};
>  +
>  +static unsigned int psc_i2s_fixed_rates[] = {
>  +       8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000,
>  +};
>  +
>  +static struct snd_pcm_hw_constraint_list psc_i2s_constraints_rates = {
>  +       .count = ARRAY_SIZE(psc_i2s_fixed_rates),
>  +       .list = psc_i2s_fixed_rates,
>  +       .mask = 0,
>  +};
>  +
>  +static int psc_i2s_pcm_open(struct snd_pcm_substream *substream)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +       struct psc_i2s_stream *s;
>  +       int rc;
>  +
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_pcm_open(substream=%p)\n", substream);
>  +
>  +       if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
>  +               s = &psc_i2s->capture_stream;
>  +       else
>  +               s = &psc_i2s->playback_stream;
>  +
>  +       snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware);
>  +
>  +       rc = snd_pcm_hw_constraint_integer(substream->runtime,
>  +                                          SNDRV_PCM_HW_PARAM_PERIODS);
>  +       if (rc < 0) {
>  +               dev_err(psc_i2s->dev, "invalid buffer size\n");
>  +               return rc;
>  +       }
>  +       rc = snd_pcm_hw_constraint_list(substream->runtime, 0,
>  +                                       SNDRV_PCM_HW_PARAM_RATE,
>  +                                       &psc_i2s_constraints_rates);
>  +       if (rc < 0) {
>  +               dev_err(psc_i2s->dev, "invalid rate\n");
>  +               return rc;
>  +       }
>  +
>  +       s->stream = substream;
>  +       return 0;
>  +}
>  +
>  +static int psc_i2s_pcm_close(struct snd_pcm_substream * substream)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +       struct psc_i2s_stream *s;
>  +
>  +       dev_dbg(psc_i2s->dev, "psc_i2s_pcm_close(substream=%p)\n", substream);
>  +
>  +       if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
>  +               s = &psc_i2s->capture_stream;
>  +       else
>  +               s = &psc_i2s->playback_stream;
>  +
>  +       s->stream = NULL;
>  +       return 0;
>  +}
>  +
>  +static snd_pcm_uframes_t
>  +psc_i2s_pcm_pointer(struct snd_pcm_substream *substream)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = substream->private_data;
>  +       struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
>  +       struct psc_i2s_stream *s;
>  +       dma_addr_t count;
>  +
>  +       if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
>  +               s = &psc_i2s->capture_stream;
>  +       else
>  +               s = &psc_i2s->playback_stream;
>  +
>  +       /*FIXME: count = s->sdma->bd[s->sdma->outdex].data - s->period_start;*/
>  +       count = s->period_current_pt - s->period_start;
>  +
>  +       return bytes_to_frames(substream->runtime, count);
>  +}
>  +
>  +static struct snd_pcm_ops psc_i2s_pcm_ops = {
>  +       .open           = psc_i2s_pcm_open,
>  +       .close          = psc_i2s_pcm_close,
>  +       .ioctl          = snd_pcm_lib_ioctl,
>  +       .pointer        = psc_i2s_pcm_pointer,
>  +};
>  +
>  +static u64 psc_i2s_pcm_dmamask = 0xffffffff;
>  +static int psc_i2s_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
>  +                          struct snd_pcm *pcm)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = pcm->private_data;
>  +       size_t size = psc_i2s_pcm_hardware.buffer_bytes_max;
>  +       int rc = 0;
>  +
>  +       dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
>  +               card, dai, pcm);
>  +
>  +       if (!card->dev->dma_mask)
>  +               card->dev->dma_mask = &psc_i2s_pcm_dmamask;
>  +       if (!card->dev->coherent_dma_mask)
>  +               card->dev->coherent_dma_mask = 0xffffffff;
>  +
>  +       rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
>  +                                &pcm->streams[0].substream->dma_buffer);
>  +       if (rc) {
>  +               dev_err(card->dev, "Cannot alloc playback DMA buffer\n");
>  +               return -ENOMEM;
>  +       }
>  +
>  +       rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
>  +                                &pcm->streams[1].substream->dma_buffer);
>  +       if (rc) {
>  +               snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
>  +               dev_err(card->dev, "Can't allocate capture DMA buffer\n");
>  +               return -ENOMEM;
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +static void psc_i2s_pcm_free(struct snd_pcm *pcm)
>  +{
>  +       struct snd_soc_pcm_runtime *rtd = pcm->private_data;
>  +       struct snd_pcm_substream *substream;
>  +       int stream;
>  +
>  +       dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_free(pcm=%p)\n", pcm);
>  +
>  +       for (stream = 0; stream < 2; stream++) {
>  +               substream = pcm->streams[stream].substream;
>  +               if (substream) {
>  +                       snd_dma_free_pages(&substream->dma_buffer);
>  +                       substream->dma_buffer.area = NULL;
>  +                       substream->dma_buffer.addr = 0;
>  +               }
>  +       }
>  +}
>  +
>  +struct snd_soc_platform psc_i2s_pcm_soc_platform = {
>  +       .name           = "mpc5200-psc-audio",
>  +       .pcm_ops        = &psc_i2s_pcm_ops,
>  +       .pcm_new        = &psc_i2s_pcm_new,
>  +       .pcm_free       = &psc_i2s_pcm_free,
>  +};
>  +
>  +/* ---------------------------------------------------------------------
>  + * Sysfs attributes for debugging
>  + */
>  +
>  +static ssize_t psc_i2s_status_show(struct device *dev,
>  +                          struct device_attribute *attr, char *buf)
>  +{
>  +       struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
>  +
>  +       return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x tfnum=%i tfstat=0x%.4x\n",
>  +                       in_be16(&psc_i2s->psc_regs->sr_csr.status),
>  +                       in_be32(&psc_i2s->psc_regs->sicr),
>  +                       in_be16(&psc_i2s->fifo_regs->rfnum) & 0x1ff,
>  +                       in_be16(&psc_i2s->fifo_regs->rfstat),
>  +                       in_be16(&psc_i2s->fifo_regs->tfnum) & 0x1ff,
>  +                       in_be16(&psc_i2s->fifo_regs->tfstat));
>  +}
>  +
>  +static int * psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s,
>  +                                  const char *name)
>  +{
>  +       if (strcmp(name, "playback_underrun") == 0)
>  +               return &psc_i2s->stats.underrun_count;
>  +       if (strcmp(name, "capture_overrun") == 0)
>  +               return &psc_i2s->stats.overrun_count;
>  +
>  +       return NULL;
>  +}
>  +
>  +static ssize_t psc_i2s_stat_show(struct device *dev,
>  +                                struct device_attribute *attr, char *buf)
>  +{
>  +       struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
>  +       int *attrib;
>  +
>  +       attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
>  +       if (!attrib)
>  +               return 0;
>  +
>  +       return sprintf(buf, "%i\n", *attrib);
>  +}
>  +
>  +static ssize_t psc_i2s_stat_store(struct device *dev,
>  +                                 struct device_attribute *attr,
>  +                                 const char *buf,
>  +                                 size_t count)
>  +{
>  +       struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
>  +       int *attrib;
>  +
>  +       attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
>  +       if (!attrib)
>  +               return 0;
>  +
>  +       *attrib = simple_strtoul(buf, NULL, 0);
>  +       return count;
>  +}
>  +
>  +DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
>  +DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show,psc_i2s_stat_store);
>  +DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show, psc_i2s_stat_store);
>  +
>  +/* ---------------------------------------------------------------------
>  + * OF platform bus binding code:
>  + * - Probe/remove operations
>  + * - OF device match table
>  + */
>  +static int __devinit psc_i2s_of_probe(struct of_device *op,
>  +                                     const struct of_device_id *match)
>  +{
>  +       phys_addr_t fifo;
>  +       struct psc_i2s *psc_i2s;
>  +       struct resource res;
>  +       int size, psc_id, irq, rc;
>  +       const __be32 *prop;
>  +       void __iomem *regs;
>  +
>  +       dev_dbg(&op->dev, "probing psc i2s device\n");
>  +
>  +       /* Get the PSC ID */
>  +       prop = of_get_property(op->node, "cell-index", &size);
>  +       if (!prop || size < sizeof *prop)
>  +               return -ENODEV;
>  +       psc_id = be32_to_cpu(*prop);
>  +
>  +       /* Fetch the registers and IRQ of the PSC */
>  +       irq = irq_of_parse_and_map(op->node, 0);
>  +       if (of_address_to_resource(op->node, 0, &res)) {
>  +               dev_err(&op->dev, "Missing reg property\n");
>  +               return -ENODEV;
>  +       }
>  +       regs = ioremap(res.start, 1 + res.end - res.start);
>  +       if (!regs) {
>  +               dev_err(&op->dev, "Could not map registers\n");
>  +               return -ENODEV;
>  +       }
>  +
>  +       /* Allocate and initialize the driver private data */
>  +       psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL);
>  +       if (!psc_i2s) {
>  +               iounmap(regs);
>  +               return -ENOMEM;
>  +       }
>  +       spin_lock_init(&psc_i2s->lock);
>  +       psc_i2s->irq = irq;
>  +       psc_i2s->psc_regs = regs;
>  +       psc_i2s->fifo_regs = regs + sizeof *psc_i2s->psc_regs;
>  +       psc_i2s->dev = &op->dev;
>  +       psc_i2s->playback_stream.psc_i2s = psc_i2s;
>  +       psc_i2s->capture_stream.psc_i2s = psc_i2s;
>  +       snprintf(psc_i2s->name, sizeof psc_i2s->name, "PSC%u", psc_id+1);
>  +
>  +       /* Fill out the CPU DAI structure */
>  +       memcpy(&psc_i2s->dai, &psc_i2s_dai_template, sizeof psc_i2s->dai);
>  +       psc_i2s->dai.private_data = psc_i2s;
>  +       psc_i2s->dai.name = psc_i2s->name;
>  +       psc_i2s->dai.id = psc_id;
>  +
>  +       /* Find the address of the fifo data registers and setup the
>  +        * DMA tasks */
>  +       fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
>  +       psc_i2s->capture_stream.bcom_task =
>  +               bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512);
>  +       psc_i2s->playback_stream.bcom_task =
>  +               bcom_psc_gen_bd_tx_init(psc_id, 10, fifo);
>  +       if (!psc_i2s->capture_stream.bcom_task ||
>  +           !psc_i2s->playback_stream.bcom_task) {
>  +               dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
>  +               iounmap(regs);
>  +               kfree(psc_i2s);
>  +               return -ENODEV;
>  +       }
>  +
>  +       /* 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);
>  +       rc = device_create_file(psc_i2s->dev, &dev_attr_capture_overrun);
>  +       rc = device_create_file(psc_i2s->dev, &dev_attr_playback_underrun);
>  +       if (rc)
>  +               dev_info(psc_i2s->dev, "error creating sysfs files\n");
>  +
>  +       /* 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");
>  +
>  +       bcom_gen_bd_rx_release(psc_i2s->capture_stream.bcom_task);
>  +       bcom_gen_bd_tx_release(psc_i2s->playback_stream.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);
>  +
>  +
>
>  _______________________________________________
>  Alsa-devel mailing list
>  Alsa-devel at alsa-project.org
>  http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>


-- 
Jon Smirl
jonsmirl at gmail.com


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