[alsa-devel] [PATCH v2 2/6] ASoC: Davinci: McBSP: add device tree support for McBSP
Petr Kulhavy
petr at barix.com
Mon Apr 11 13:45:13 CEST 2016
This adds DT support for the TI DA8xx/OMAP-L1x/AM17xx/AM18xx McBSP driver.
Signed-off-by: Petr Kulhavy <petr at barix.com>
---
v1: initial
v2: remove "-audio" postfix from the compatible string
of_match_table renamed consistently with the rest of the file (davinci_i2s_match)
"channel-combine" property removed
devicetree DMA configuration in probe simplified
sound/soc/davinci/Kconfig | 6 ++-
sound/soc/davinci/davinci-i2s.c | 116 +++++++++++++++++++++++++++++++---------
2 files changed, 95 insertions(+), 27 deletions(-)
diff --git a/sound/soc/davinci/Kconfig b/sound/soc/davinci/Kconfig
index 50ca291cc225..6b732d8e5896 100644
--- a/sound/soc/davinci/Kconfig
+++ b/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"
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index ec98548a5fc9..a3f82d1a73dc 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -4,9 +4,15 @@
* Author: Vladimir Barinov, <vbarinov at embeddedalley.com>
* Copyright: (C) 2007 MontaVista Software, Inc., <source at mvista.com>
*
+ * DT support (c) 2016 Petr Kulhavy, Barix AG <petr at 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>
@@ -648,15 +654,62 @@ static const struct snd_soc_component_driver davinci_i2s_component = {
.name = "davinci-i2s",
};
+static struct snd_platform_data*
+davinci_i2s_set_pdata_from_of(struct platform_device *pdev)
+{
+ struct snd_platform_data *pdata = NULL;
+ struct device_node *np;
+
+ if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
+ return dev_get_platdata(&pdev->dev);
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ np = pdev->dev.of_node;
+
+ /* parse properties here */
+
+ /*
+ * pdata->clk_input_pin is deliberately not exported to DT
+ * and the default value of the clk_input_pin is MCBSP_CLKR.
+ * The value MCBSP_CLKS makes no sense as it turns the CPU
+ * to a bit clock master in the SND_SOC_DAIFMT_CBM_CFS mode
+ * where it should be bit clock slave!
+ */
+
+ return pdata;
+}
+
static int davinci_i2s_probe(struct platform_device *pdev)
{
+ struct snd_dmaengine_dai_dma_data *dma_data;
+ struct snd_platform_data *pdata;
struct davinci_mcbsp_dev *dev;
struct resource *mem, *res;
void __iomem *io_base;
int *dma;
int ret;
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pdata = davinci_i2s_set_pdata_from_of(pdev);
+ if (IS_ERR(pdata)) {
+ dev_err(&pdev->dev, "Error populating platform data, err %ld\n",
+ PTR_ERR(pdata));
+ return PTR_ERR(pdata);
+ }
+
+ 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 +719,43 @@ 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;
+ 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 = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
- *dma = res->start;
- dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data = dma;
+
+ 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;
+ 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;
}
- dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
- *dma = res->start;
- dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data = dma;
+
+ 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 +794,18 @@ 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),
},
};
--
1.9.1
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