/* * Freescale MPC5200 PSC in I2S mode * ALSA SoC Digital Audio Interface (DAI) driver * * Copyright (C) 2008 Secret Lab Technologies Ltd. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Grant Likely "); 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 * @dai: the CPU DAI for this device * @sicr: Base value used in serial interface control register; mode is ORed * with this value. * @playback: Playback stream context data * @capture: 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_dai dai; spinlock_t lock; u32 sicr; /* per-stream data */ struct psc_i2s_stream playback; struct psc_i2s_stream capture; /* 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 isr; isr = in_be16(®s->mpc52xx_psc_isr); /* Playback underrun error */ if (psc_i2s->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP)) psc_i2s->stats.underrun_count++; /* Capture overrun error */ if (psc_i2s->capture.active && (isr & MPC52xx_PSC_IMR_ORERR)) psc_i2s->stats.overrun_count++; out_8(®s->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; /* 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); } /* 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, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data; int rc; dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream); if (!psc_i2s->playback.active && !psc_i2s->capture.active) { /* Setup the IRQs */ rc = request_irq(psc_i2s->irq, &psc_i2s_status_irq, IRQF_SHARED, "psc-i2s-status", psc_i2s); rc |= request_irq(psc_i2s->capture.irq, &psc_i2s_bcom_irq, IRQF_SHARED, "psc-i2s-capture", &psc_i2s->capture); rc |= request_irq(psc_i2s->playback.irq, &psc_i2s_bcom_irq, IRQF_SHARED, "psc-i2s-playback", &psc_i2s->playback); if (rc) { free_irq(psc_i2s->irq, psc_i2s); free_irq(psc_i2s->capture.irq, &psc_i2s->capture); free_irq(psc_i2s->playback.irq, &psc_i2s->playback); return -ENODEV; } } return 0; } static int psc_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data; u32 mode; dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i" " periods=%i buffer_size=%i buffer_bytes=%i\n", __func__, substream, params_period_size(params), params_period_bytes(params), params_periods(params), params_buffer_size(params), params_buffer_bytes(params)); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S8: mode = MPC52xx_PSC_SICR_SIM_CODEC_8; break; case SNDRV_PCM_FORMAT_S16_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_16; break; case SNDRV_PCM_FORMAT_S24_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_24; break; case SNDRV_PCM_FORMAT_S32_BE: mode = 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, psc_i2s->sicr | mode); snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; } static int psc_i2s_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { 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_dai *dai) { 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; unsigned long flags; if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) s = &psc_i2s->capture; else s = &psc_i2s->playback; 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(®s->command, MPC52xx_PSC_RST_RX); out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); } else { out_8(®s->command, MPC52xx_PSC_RST_TX); out_8(®s->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); /* 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(®s->ipcr_acr.ipcr) & 0x80) != 0) ; /* then wait for the transition to high */ while ((in_8(®s->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(®s->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.active) { out_8(®s->command, 2 << 4); /* reset rx */ out_8(®s->command, 3 << 4); /* reset tx */ out_8(®s->command, 4 << 4); /* reset err */ } } else { out_8(®s->command, 3 << 4); /* reset tx */ out_8(®s->command, 4 << 4); /* reset err */ if (!psc_i2s->capture.active) out_8(®s->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.active) imr |= MPC52xx_PSC_IMR_TXEMP; if (psc_i2s->capture.active) imr |= MPC52xx_PSC_IMR_ORERR; out_be16(®s->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_dai *dai) { 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.active && !psc_i2s->capture.active) { /* Disable all interrupts and reset the PSC */ out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0); out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset tx */ out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset rx */ out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */ out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */ /* Release irqs */ free_irq(psc_i2s->irq, psc_i2s); free_irq(psc_i2s->capture.irq, &psc_i2s->capture); free_irq(psc_i2s->playback.irq, &psc_i2s->playback); } } /** * 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_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_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_dai_ops psc_i2s_dai_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, .set_sysclk = psc_i2s_set_sysclk, .set_fmt = psc_i2s_set_fmt, }; static struct snd_soc_dai psc_i2s_dai_template = { .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 = &psc_i2s_dai_ops, }; /* --------------------------------------------------------------------- * 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, .periods_min = 2, .periods_max = 256, .buffer_bytes_max = 2 * 1024 * 1024, .fifo_size = 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; 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; else s = &psc_i2s->playback; snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware); 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; else s = &psc_i2s->playback; 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; else s = &psc_i2s->playback; 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_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; if (pcm->streams[0].substream) { rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size, &pcm->streams[0].substream->dma_buffer); if (rc) goto playback_alloc_err; } if (pcm->streams[1].substream) { rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size, &pcm->streams[1].substream->dma_buffer); if (rc) goto capture_alloc_err; } return 0; capture_alloc_err: if (pcm->streams[0].substream) snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer); playback_alloc_err: dev_err(card->dev, "Cannot allocate buffer(s)\n"); return -ENOMEM; } 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; } static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL); static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show, psc_i2s_stat_store); static 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.psc_i2s = psc_i2s; psc_i2s->capture.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.bcom_task = bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512); psc_i2s->playback.bcom_task = bcom_psc_gen_bd_tx_init(psc_id, 10, fifo); if (!psc_i2s->capture.bcom_task || !psc_i2s->playback.bcom_task) { dev_err(&op->dev, "Could not allocate bestcomm tasks\n"); iounmap(regs); kfree(psc_i2s); return -ENODEV; } /* Disable all interrupts and reset the PSC */ out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0); out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset transmitter */ out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset receiver */ out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */ out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */ /* Configure the serial interface mode; defaulting to CODEC8 mode */ psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | MPC52xx_PSC_SICR_CLKPOL; if (of_get_property(op->node, "fsl,cellslave", NULL)) psc_i2s->sicr |= MPC52xx_PSC_SICR_CELLSLAVE | MPC52xx_PSC_SICR_GENCLK; out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); /* Check for the codec handle. If it is not present then we * are done */ 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); 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"); snd_soc_register_platform(&psc_i2s_pcm_soc_platform); /* 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"); snd_soc_unregister_platform(&psc_i2s_pcm_soc_platform); 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);