diff options
Diffstat (limited to 'sound/soc/fsl/mpc5200_psc_i2s.c')
| -rw-r--r-- | sound/soc/fsl/mpc5200_psc_i2s.c | 754 |
1 files changed, 55 insertions, 699 deletions
diff --git a/sound/soc/fsl/mpc5200_psc_i2s.c b/sound/soc/fsl/mpc5200_psc_i2s.c index 1111c71..ce8de90 100644 --- a/sound/soc/fsl/mpc5200_psc_i2s.c +++ b/sound/soc/fsl/mpc5200_psc_i2s.c @@ -3,31 +3,21 @@ * ALSA SoC Digital Audio Interface (DAI) driver * * Copyright (C) 2008 Secret Lab Technologies Ltd. + * Copyright (C) 2009 Jon Smirl, Digispeaker */ -#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-simple.h> -#include <sysdev/bestcomm/bestcomm.h> -#include <sysdev/bestcomm/gen_bd.h> #include <asm/mpc52xx_psc.h> -MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); -MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); -MODULE_LICENSE("GPL"); +#include "mpc5200_psc_i2s.h" +#include "mpc5200_dma.h" /** * PSC_I2S_RATES: sample rates supported by the I2S @@ -44,191 +34,17 @@ MODULE_LICENSE("GPL"); * 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; -} + SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) 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; + struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; u32 mode; - dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i" + dev_dbg(psc_dma->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), @@ -248,175 +64,15 @@ static int psc_i2s_hw_params(struct snd_pcm_substream *substream, 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"); + dev_dbg(psc_dma->dev, "invalid format\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); + out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); 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 @@ -433,8 +89,8 @@ static void psc_i2s_shutdown(struct snd_pcm_substream *substream, 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", + struct psc_dma *psc_dma = cpu_dai->private_data; + dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", cpu_dai, dir); return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; } @@ -452,8 +108,8 @@ static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, */ 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", + struct psc_dma *psc_dma = cpu_dai->private_data; + dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", cpu_dai, format); return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; } @@ -469,16 +125,13 @@ static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) * 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 = { +struct snd_soc_dai psc_i2s_dai[] = {{ + .name = "I2S", .playback = { .channels_min = 2, .channels_max = 2, @@ -492,223 +145,8 @@ static struct snd_soc_dai psc_i2s_dai_template = { .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 | - SNDRV_PCM_INFO_BATCH, - .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); +} }; +EXPORT_SYMBOL_GPL(psc_i2s_dai); /* --------------------------------------------------------------------- * OF platform bus binding code: @@ -718,150 +156,65 @@ static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show, 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; - } + int rc; + struct psc_dma *psc_dma; + struct mpc52xx_psc __iomem *regs; - /* 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; + rc = mpc5200_audio_dma_create(op); + if (rc != 0) + return rc; + + rc = snd_soc_register_dais(psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); + if (rc != 0) { + pr_err("Failed to register DAI\n"); + return 0; } - /* 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 */ + psc_dma = dev_get_drvdata(&op->dev); + regs = psc_dma->psc_regs; /* Configure the serial interface mode; defaulting to CODEC8 mode */ - psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | + psc_dma->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); + out_be32(&psc_dma->psc_regs->sicr, + psc_dma->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); + /* Due to errata in the dma mode; need to line up enabling + * the transmitter with a transition on the frame sync + * line */ + + /* 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) */ + + /* Go */ + out_8(&psc_dma->psc_regs->command, + MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); 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; + return mpc5200_audio_dma_destroy(op); } /* Match table for of_platform binding */ static struct of_device_id psc_i2s_match[] __devinitdata = { { .compatible = "fsl,mpc5200-psc-i2s", }, + { .compatible = "fsl,mpc5200b-psc-i2s", }, {} }; MODULE_DEVICE_TABLE(of, psc_i2s_match); @@ -892,4 +245,7 @@ static void __exit psc_i2s_exit(void) } module_exit(psc_i2s_exit); +MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); +MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); +MODULE_LICENSE("GPL"); |
