Merge remote-tracking branches 'asoc/topic/davinci' and 'asoc/topic/dwc' into asoc-next

Documentation/devicetree/bindings/sound/davinci-mcbsp.txt

+Texas Instruments DaVinci McBSP module
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This binding describes the "Multi-channel Buffered Serial Port" (McBSP)
+audio interface found in some TI DaVinci processors like the OMAP-L138 or AM180x.
+
+
+Required properties:
+~~~~~~~~~~~~~~~~~~~~
+- compatible :
+        "ti,da850-mcbsp" : for DA850, AM180x and OPAM-L138 platforms
+
+- reg : physical base address and length of the controller memory mapped
+        region(s).
+- reg-names : Should contain:
+        * "mpu" for the main registers (required).
+        * "dat" for the data FIFO (optional).
+
+- dmas: three element list of DMA controller phandles, DMA request line and
+	TC channel ordered triplets.
+- dma-names: identifier string for each DMA request line in the dmas property.
+	These strings correspond 1:1 with the ordered pairs in dmas. The dma
+	identifiers must be "rx" and "tx".
+
+Optional properties:
+~~~~~~~~~~~~~~~~~~~~
+- interrupts : Interrupt numbers for McBSP
+- interrupt-names : Known interrupt names are "rx" and "tx"
+
+- pinctrl-0: Should specify pin control group used for this controller.
+- pinctrl-names: Should contain only one value - "default", for more details
+        please refer to pinctrl-bindings.txt
+
+Example (AM1808):
+~~~~~~~~~~~~~~~~~
+
+mcbsp0: mcbsp@1d10000 {
+	compatible = "ti,da850-mcbsp";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcbsp0_pins>;
+
+	reg = 	<0x00110000 0x1000>,
+		<0x00310000 0x1000>;
+	reg-names = "mpu", "dat";
+	interrupts = <97 98>;
+	interrupts-names = "rx", "tx";
+	dmas = <&edma0 3 1
+		&edma0 2 1>;
+	dma-names = "tx", "rx";
+	status = "okay";
+};

sound/soc/davinci/Kconfig

@@ -16,7 +16,11 @@ config SND_EDMA_SOC
 	  - DRA7xx family
 
 config SND_DAVINCI_SOC_I2S
-	tristate
+	tristate "DaVinci Multichannel Buffered Serial Port (McBSP) support"
+	depends on SND_EDMA_SOC
+	help
+	  Say Y or M here if you want to have support for McBSP IP found in
+	  Texas Instruments DaVinci DA850 SoCs.
 
 config SND_DAVINCI_SOC_MCASP
 	tristate "Multichannel Audio Serial Port (McASP) support"

sound/soc/davinci/davinci-i2s.c

@@ -4,9 +4,15 @@
  * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
  * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
  *
+ * DT support	(c) 2016 Petr Kulhavy, Barix AG <petr@barix.com>
+ *		based on davinci-mcasp.c DT support
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
+ *
+ * TODO:
+ * on DA850 implement HW FIFOs instead of DMA into DXR and DRR registers
  */
 
 #include <linux/init.h>
@@ -650,13 +656,24 @@ static const struct snd_soc_component_driver davinci_i2s_component = {
 
 static int davinci_i2s_probe(struct platform_device *pdev)
 {
+	struct snd_dmaengine_dai_dma_data *dma_data;
 	struct davinci_mcbsp_dev *dev;
 	struct resource *mem, *res;
 	void __iomem *io_base;
 	int *dma;
 	int ret;
 
+	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
+	if (!mem) {
+		dev_warn(&pdev->dev,
+			 "\"mpu\" mem resource not found, using index 0\n");
 		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		if (!mem) {
+			dev_err(&pdev->dev, "no mem resource?\n");
+			return -ENODEV;
+		}
+	}
+
 	io_base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(io_base))
 		return PTR_ERR(io_base);
@@ -666,39 +683,43 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 	if (!dev)
 		return -ENOMEM;
 
-	dev->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dev->clk))
-		return -ENODEV;
-	clk_enable(dev->clk);
-
 	dev->base = io_base;
 
-	dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
-	    (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
-
-	dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
-	    (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
+	/* setup DMA, first TX, then RX */
+	dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
+	dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
 
-	/* first TX, then RX */
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no DMA resource\n");
-		ret = -ENXIO;
-		goto err_release_clk;
-	}
+	if (res) {
 		dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
 		*dma = res->start;
-	dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data = dma;
+		dma_data->filter_data = dma;
+	} else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+		dma_data->filter_data = "tx";
+	} else {
+		dev_err(&pdev->dev, "Missing DMA tx resource\n");
+		return -ENODEV;
+	}
+
+	dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
+	dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
 
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!res) {
-		dev_err(&pdev->dev, "no DMA resource\n");
-		ret = -ENXIO;
-		goto err_release_clk;
-	}
+	if (res) {
 		dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
 		*dma = res->start;
-	dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data = dma;
+		dma_data->filter_data = dma;
+	} else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+		dma_data->filter_data = "rx";
+	} else {
+		dev_err(&pdev->dev, "Missing DMA rx resource\n");
+		return -ENODEV;
+	}
+
+	dev->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk))
+		return -ENODEV;
+	clk_enable(dev->clk);
 
 	dev->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, dev);
@@ -737,11 +758,18 @@ static int davinci_i2s_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id davinci_i2s_match[] = {
+	{ .compatible = "ti,da850-mcbsp" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, davinci_i2s_match);
+
 static struct platform_driver davinci_mcbsp_driver = {
 	.probe		= davinci_i2s_probe,
 	.remove		= davinci_i2s_remove,
 	.driver		= {
 		.name	= "davinci-mcbsp",
+		.of_match_table = of_match_ptr(davinci_i2s_match),
 	},
 };
 

sound/soc/davinci/davinci-mcasp.c

@@ -540,21 +540,19 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 	return ret;
 }
 
-static int __davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
+static int __davinci_mcasp_set_clkdiv(struct davinci_mcasp *mcasp, int div_id,
 				      int div, bool explicit)
 {
-	struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
-
 	pm_runtime_get_sync(mcasp->dev);
 	switch (div_id) {
-	case 0:		/* MCLK divider */
+	case MCASP_CLKDIV_AUXCLK:			/* MCLK divider */
 		mcasp_mod_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG,
 			       AHCLKXDIV(div - 1), AHCLKXDIV_MASK);
 		mcasp_mod_bits(mcasp, DAVINCI_MCASP_AHCLKRCTL_REG,
 			       AHCLKRDIV(div - 1), AHCLKRDIV_MASK);
 		break;
 
-	case 1:		/* BCLK divider */
+	case MCASP_CLKDIV_BCLK:			/* BCLK divider */
 		mcasp_mod_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG,
 			       ACLKXDIV(div - 1), ACLKXDIV_MASK);
 		mcasp_mod_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG,
@@ -563,7 +561,8 @@ static int __davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
 			mcasp->bclk_div = div;
 		break;
 
-	case 2:	/*
+	case MCASP_CLKDIV_BCLK_FS_RATIO:
+		/*
 		 * BCLK/LRCLK ratio descries how many bit-clock cycles
 		 * fit into one frame. The clock ratio is given for a
 		 * full period of data (for I2S format both left and
@@ -591,7 +590,9 @@ static int __davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
 static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
 				    int div)
 {
-	return __davinci_mcasp_set_clkdiv(dai, div_id, div, 1);
+	struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
+
+	return __davinci_mcasp_set_clkdiv(mcasp, div_id, div, 1);
 }
 
 static int davinci_mcasp_set_sysclk(struct snd_soc_dai *dai, int clk_id,
@@ -999,27 +1000,53 @@ static int mcasp_dit_hw_param(struct davinci_mcasp *mcasp,
 }
 
 static int davinci_mcasp_calc_clk_div(struct davinci_mcasp *mcasp,
-				      unsigned int bclk_freq,
-				      int *error_ppm)
+				      unsigned int bclk_freq, bool set)
 {
-	int div = mcasp->sysclk_freq / bclk_freq;
-	int rem = mcasp->sysclk_freq % bclk_freq;
+	int error_ppm;
+	unsigned int sysclk_freq = mcasp->sysclk_freq;
+	u32 reg = mcasp_get_reg(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG);
+	int div = sysclk_freq / bclk_freq;
+	int rem = sysclk_freq % bclk_freq;
+	int aux_div = 1;
+
+	if (div > (ACLKXDIV_MASK + 1)) {
+		if (reg & AHCLKXE) {
+			aux_div = div / (ACLKXDIV_MASK + 1);
+			if (div % (ACLKXDIV_MASK + 1))
+				aux_div++;
+
+			sysclk_freq /= aux_div;
+			div = sysclk_freq / bclk_freq;
+			rem = sysclk_freq % bclk_freq;
+		} else if (set) {
+			dev_warn(mcasp->dev, "Too fast reference clock (%u)\n",
+				 sysclk_freq);
+		}
+	}
 
 	if (rem != 0) {
 		if (div == 0 ||
-		    ((mcasp->sysclk_freq / div) - bclk_freq) >
-		    (bclk_freq - (mcasp->sysclk_freq / (div+1)))) {
+		    ((sysclk_freq / div) - bclk_freq) >
+		    (bclk_freq - (sysclk_freq / (div+1)))) {
 			div++;
 			rem = rem - bclk_freq;
 		}
 	}
+	error_ppm = (div*1000000 + (int)div64_long(1000000LL*rem,
+		     (int)bclk_freq)) / div - 1000000;
+
+	if (set) {
 		if (error_ppm)
-		*error_ppm =
-			(div*1000000 + (int)div64_long(1000000LL*rem,
-						       (int)bclk_freq))
-			/div - 1000000;
+			dev_info(mcasp->dev, "Sample-rate is off by %d PPM\n",
+				 error_ppm);
+
+		__davinci_mcasp_set_clkdiv(mcasp, MCASP_CLKDIV_BCLK, div, 0);
+		if (reg & AHCLKXE)
+			__davinci_mcasp_set_clkdiv(mcasp, MCASP_CLKDIV_AUXCLK,
+						   aux_div, 0);
+	}
 
-	return div;
+	return error_ppm;
 }
 
 static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
@@ -1044,18 +1071,11 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
 		int slots = mcasp->tdm_slots;
 		int rate = params_rate(params);
 		int sbits = params_width(params);
-		int ppm, div;
 
 		if (mcasp->slot_width)
 			sbits = mcasp->slot_width;
 
-		div = davinci_mcasp_calc_clk_div(mcasp, rate*sbits*slots,
-						 &ppm);
-		if (ppm)
-			dev_info(mcasp->dev, "Sample-rate is off by %d PPM\n",
-				 ppm);
-
-		__davinci_mcasp_set_clkdiv(cpu_dai, 1, div, 0);
+		davinci_mcasp_calc_clk_div(mcasp, rate * sbits * slots, true);
 	}
 
 	ret = mcasp_common_hw_param(mcasp, substream->stream,
@@ -1166,7 +1186,8 @@ static int davinci_mcasp_hw_rule_rate(struct snd_pcm_hw_params *params,
 				davinci_mcasp_dai_rates[i];
 			int ppm;
 
-			davinci_mcasp_calc_clk_div(rd->mcasp, bclk_freq, &ppm);
+			ppm = davinci_mcasp_calc_clk_div(rd->mcasp, bclk_freq,
+							 false);
 			if (abs(ppm) < DAVINCI_MAX_RATE_ERROR_PPM) {
 				if (range.empty) {
 					range.min = davinci_mcasp_dai_rates[i];
@@ -1205,8 +1226,9 @@ static int davinci_mcasp_hw_rule_format(struct snd_pcm_hw_params *params,
 			if (rd->mcasp->slot_width)
 				sbits = rd->mcasp->slot_width;
 
-			davinci_mcasp_calc_clk_div(rd->mcasp, sbits*slots*rate,
-						   &ppm);
+			ppm = davinci_mcasp_calc_clk_div(rd->mcasp,
+							 sbits * slots * rate,
+							 false);
 			if (abs(ppm) < DAVINCI_MAX_RATE_ERROR_PPM) {
 				snd_mask_set(&nfmt, i);
 				count++;
@@ -1230,11 +1252,15 @@ static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
 	int i, dir;
 	int tdm_slots = mcasp->tdm_slots;
 
-	if (mcasp->tdm_mask[substream->stream])
-		tdm_slots = hweight32(mcasp->tdm_mask[substream->stream]);
+	/* Do not allow more then one stream per direction */
+	if (mcasp->substreams[substream->stream])
+		return -EBUSY;
 
 	mcasp->substreams[substream->stream] = substream;
 
+	if (mcasp->tdm_mask[substream->stream])
+		tdm_slots = hweight32(mcasp->tdm_mask[substream->stream]);
+
 	if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE)
 		return 0;
 

sound/soc/davinci/davinci-mcasp.h

@@ -306,4 +306,9 @@
 #define NUMEVT(x)	(((x) & 0xFF) << 8)
 #define NUMDMA_MASK	(0xFF)
 
+/* clock divider IDs */
+#define MCASP_CLKDIV_AUXCLK		0 /* HCLK divider from AUXCLK */
+#define MCASP_CLKDIV_BCLK		1 /* BCLK divider from HCLK */
+#define MCASP_CLKDIV_BCLK_FS_RATIO	2 /* to set BCLK FS ration */
+
 #endif	/* DAVINCI_MCASP_H */

sound/soc/dwc/designware_i2s.c

@@ -100,6 +100,7 @@ struct dw_i2s_dev {
 	struct device *dev;
 	u32 ccr;
 	u32 xfer_resolution;
+	u32 fifo_th;
 
 	/* data related to DMA transfers b/w i2s and DMAC */
 	union dw_i2s_snd_dma_data play_dma_data;
@@ -147,17 +148,18 @@ static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
 static void i2s_start(struct dw_i2s_dev *dev,
 		      struct snd_pcm_substream *substream)
 {
+	struct i2s_clk_config_data *config = &dev->config;
 	u32 i, irq;
 	i2s_write_reg(dev->i2s_base, IER, 1);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		for (i = 0; i < 4; i++) {
+		for (i = 0; i < (config->chan_nr / 2); i++) {
 			irq = i2s_read_reg(dev->i2s_base, IMR(i));
 			i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x30);
 		}
 		i2s_write_reg(dev->i2s_base, ITER, 1);
 	} else {
-		for (i = 0; i < 4; i++) {
+		for (i = 0; i < (config->chan_nr / 2); i++) {
 			irq = i2s_read_reg(dev->i2s_base, IMR(i));
 			i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x03);
 		}
@@ -231,14 +233,16 @@ static void dw_i2s_config(struct dw_i2s_dev *dev, int stream)
 		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			i2s_write_reg(dev->i2s_base, TCR(ch_reg),
 				      dev->xfer_resolution);
-			i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
+			i2s_write_reg(dev->i2s_base, TFCR(ch_reg),
+				      dev->fifo_th - 1);
 			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
 			i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
 		} else {
 			i2s_write_reg(dev->i2s_base, RCR(ch_reg),
 				      dev->xfer_resolution);
-			i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
+			i2s_write_reg(dev->i2s_base, RFCR(ch_reg),
+				      dev->fifo_th - 1);
 			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
 			i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
@@ -498,6 +502,7 @@ static int dw_configure_dai(struct dw_i2s_dev *dev,
 	 */
 	u32 comp1 = i2s_read_reg(dev->i2s_base, dev->i2s_reg_comp1);
 	u32 comp2 = i2s_read_reg(dev->i2s_base, dev->i2s_reg_comp2);
+	u32 fifo_depth = 1 << (1 + COMP1_FIFO_DEPTH_GLOBAL(comp1));
 	u32 idx;
 
 	if (dev->capability & DWC_I2S_RECORD &&
@@ -536,6 +541,7 @@ static int dw_configure_dai(struct dw_i2s_dev *dev,
 		dev->capability |= DW_I2S_SLAVE;
 	}
 
+	dev->fifo_th = fifo_depth / 2;
 	return 0;
 }