diff options
| -rw-r--r-- | Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt | 2 | ||||
| -rw-r--r-- | sound/soc/davinci/davinci-mcasp.c | 124 | ||||
| -rw-r--r-- | sound/soc/davinci/davinci-mcasp.h | 11 |
3 files changed, 136 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt index 60ca07996458..46bc9829c71a 100644 --- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt +++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt @@ -32,7 +32,7 @@ Optional properties: - rx-num-evt : FIFO levels. - sram-size-playback : size of sram to be allocated during playback - sram-size-capture : size of sram to be allocated during capture -- interrupts : Interrupt numbers for McASP, currently not used by the driver +- interrupts : Interrupt numbers for McASP - interrupt-names : Known interrupt names are "tx" and "rx" - pinctrl-0: Should specify pin control group used for this controller. - pinctrl-names: Should contain only one value - "default", for more details diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index a9822c7bbb0b..e460f97c514e 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -70,6 +70,7 @@ struct davinci_mcasp { void __iomem *base; u32 fifo_base; struct device *dev; + struct snd_pcm_substream *substreams[2]; /* McASP specific data */ int tdm_slots; @@ -80,6 +81,7 @@ struct davinci_mcasp { u8 bclk_div; u16 bclk_lrclk_ratio; int streams; + u32 irq_request[2]; int sysclk_freq; bool bclk_master; @@ -185,6 +187,10 @@ static void mcasp_start_rx(struct davinci_mcasp *mcasp) mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXFSRST); if (mcasp_is_synchronous(mcasp)) mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXFSRST); + + /* enable receive IRQs */ + mcasp_set_bits(mcasp, DAVINCI_MCASP_EVTCTLR_REG, + mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE]); } static void mcasp_start_tx(struct davinci_mcasp *mcasp) @@ -214,6 +220,10 @@ static void mcasp_start_tx(struct davinci_mcasp *mcasp) mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXSMRST); /* Release Frame Sync generator */ mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXFSRST); + + /* enable transmit IRQs */ + mcasp_set_bits(mcasp, DAVINCI_MCASP_EVTCTLX_REG, + mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK]); } static void davinci_mcasp_start(struct davinci_mcasp *mcasp, int stream) @@ -228,6 +238,10 @@ static void davinci_mcasp_start(struct davinci_mcasp *mcasp, int stream) static void mcasp_stop_rx(struct davinci_mcasp *mcasp) { + /* disable IRQ sources */ + mcasp_clr_bits(mcasp, DAVINCI_MCASP_EVTCTLR_REG, + mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE]); + /* * In synchronous mode stop the TX clocks if no other stream is * running @@ -249,6 +263,10 @@ static void mcasp_stop_tx(struct davinci_mcasp *mcasp) { u32 val = 0; + /* disable IRQ sources */ + mcasp_clr_bits(mcasp, DAVINCI_MCASP_EVTCTLX_REG, + mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK]); + /* * In synchronous mode keep TX clocks running if the capture stream is * still running. @@ -276,6 +294,76 @@ static void davinci_mcasp_stop(struct davinci_mcasp *mcasp, int stream) mcasp_stop_rx(mcasp); } +static irqreturn_t davinci_mcasp_tx_irq_handler(int irq, void *data) +{ + struct davinci_mcasp *mcasp = (struct davinci_mcasp *)data; + struct snd_pcm_substream *substream; + u32 irq_mask = mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK]; + u32 handled_mask = 0; + u32 stat; + + stat = mcasp_get_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG); + if (stat & XUNDRN & irq_mask) { + dev_warn(mcasp->dev, "Transmit buffer underflow\n"); + handled_mask |= XUNDRN; + + substream = mcasp->substreams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream) { + snd_pcm_stream_lock_irq(substream); + if (snd_pcm_running(substream)) + snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); + snd_pcm_stream_unlock_irq(substream); + } + } + + if (!handled_mask) + dev_warn(mcasp->dev, "unhandled tx event. txstat: 0x%08x\n", + stat); + + if (stat & XRERR) + handled_mask |= XRERR; + + /* Ack the handled event only */ + mcasp_set_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG, handled_mask); + + return IRQ_RETVAL(handled_mask); +} + +static irqreturn_t davinci_mcasp_rx_irq_handler(int irq, void *data) +{ + struct davinci_mcasp *mcasp = (struct davinci_mcasp *)data; + struct snd_pcm_substream *substream; + u32 irq_mask = mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE]; + u32 handled_mask = 0; + u32 stat; + + stat = mcasp_get_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG); + if (stat & ROVRN & irq_mask) { + dev_warn(mcasp->dev, "Receive buffer overflow\n"); + handled_mask |= ROVRN; + + substream = mcasp->substreams[SNDRV_PCM_STREAM_CAPTURE]; + if (substream) { + snd_pcm_stream_lock_irq(substream); + if (snd_pcm_running(substream)) + snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); + snd_pcm_stream_unlock_irq(substream); + } + } + + if (!handled_mask) + dev_warn(mcasp->dev, "unhandled rx event. rxstat: 0x%08x\n", + stat); + + if (stat & XRERR) + handled_mask |= XRERR; + + /* Ack the handled event only */ + mcasp_set_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG, handled_mask); + + return IRQ_RETVAL(handled_mask); +} + static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { @@ -869,6 +957,8 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream, u32 max_channels = 0; int i, dir; + mcasp->substreams[substream->stream] = substream; + if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE) return 0; @@ -907,6 +997,8 @@ static void davinci_mcasp_shutdown(struct snd_pcm_substream *substream, { struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai); + mcasp->substreams[substream->stream] = NULL; + if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE) return; @@ -1256,6 +1348,8 @@ static int davinci_mcasp_probe(struct platform_device *pdev) struct resource *mem, *ioarea, *res, *dat; struct davinci_mcasp_pdata *pdata; struct davinci_mcasp *mcasp; + char *irq_name; + int irq; int ret; if (!pdev->dev.platform_data && !pdev->dev.of_node) { @@ -1336,6 +1430,36 @@ static int davinci_mcasp_probe(struct platform_device *pdev) mcasp->dev = &pdev->dev; + irq = platform_get_irq_byname(pdev, "rx"); + if (irq >= 0) { + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_rx\n", + dev_name(&pdev->dev)); + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + davinci_mcasp_rx_irq_handler, + IRQF_ONESHOT, irq_name, mcasp); + if (ret) { + dev_err(&pdev->dev, "RX IRQ request failed\n"); + goto err; + } + + mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE] = ROVRN; + } + + irq = platform_get_irq_byname(pdev, "tx"); + if (irq >= 0) { + irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_tx\n", + dev_name(&pdev->dev)); + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + davinci_mcasp_tx_irq_handler, + IRQF_ONESHOT, irq_name, mcasp); + if (ret) { + dev_err(&pdev->dev, "TX IRQ request failed\n"); + goto err; + } + + mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK] = XUNDRN; + } + dat = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat"); if (dat) mcasp->dat_port = true; diff --git a/sound/soc/davinci/davinci-mcasp.h b/sound/soc/davinci/davinci-mcasp.h index 9737108f0305..79dc511180bf 100644 --- a/sound/soc/davinci/davinci-mcasp.h +++ b/sound/soc/davinci/davinci-mcasp.h @@ -256,6 +256,7 @@ * DAVINCI_MCASP_TXSTAT_REG - Transmitter Status Register Bits * DAVINCI_MCASP_RXSTAT_REG - Receiver Status Register Bits */ +#define XRERR BIT(8) /* Transmit/Receive error */ #define XRDATA BIT(5) /* Transmit/Receive data ready */ /* @@ -285,6 +286,16 @@ #define TXDATADMADIS BIT(0) /* + * DAVINCI_MCASP_EVTCTLR_REG - Receiver Interrupt Control Register Bits + */ +#define ROVRN BIT(0) + +/* + * DAVINCI_MCASP_EVTCTLX_REG - Transmitter Interrupt Control Register Bits + */ +#define XUNDRN BIT(0) + +/* * DAVINCI_MCASP_W[R]FIFOCTL - Write/Read FIFO Control Register bits */ #define FIFO_ENABLE BIT(16) |