diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/soc/samsung/s3c2412-i2s.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c new file mode 100644 index 000000000..81f416ac4 --- /dev/null +++ b/sound/soc/samsung/s3c2412-i2s.c @@ -0,0 +1,251 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// ALSA Soc Audio Layer - S3C2412 I2S driver +// +// Copyright (c) 2006 Wolfson Microelectronics PLC. +// Graeme Gregory graeme.gregory@wolfsonmicro.com +// linux@wolfsonmicro.com +// +// Copyright (c) 2007, 2004-2005 Simtec Electronics +// http://armlinux.simtec.co.uk/ +// Ben Dooks <ben@simtec.co.uk> + +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> + +#include <sound/soc.h> +#include <sound/pcm_params.h> + +#include "dma.h" +#include "regs-i2s-v2.h" +#include "s3c2412-i2s.h" + +#include <linux/platform_data/asoc-s3c.h> + +static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = { + .chan_name = "tx", + .addr_width = 4, +}; + +static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = { + .chan_name = "rx", + .addr_width = 4, +}; + +static struct s3c_i2sv2_info s3c2412_i2s; + +static int s3c2412_i2s_probe(struct snd_soc_dai *dai) +{ + int ret; + + pr_debug("Entered %s\n", __func__); + + snd_soc_dai_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out, + &s3c2412_i2s_pcm_stereo_in); + + ret = s3c_i2sv2_probe(dai, &s3c2412_i2s); + if (ret) + return ret; + + s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in; + s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out; + + s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk"); + if (IS_ERR(s3c2412_i2s.iis_cclk)) { + pr_err("failed to get i2sclk clock\n"); + ret = PTR_ERR(s3c2412_i2s.iis_cclk); + goto err; + } + + /* Set MPLL as the source for IIS CLK */ + + clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll")); + ret = clk_prepare_enable(s3c2412_i2s.iis_cclk); + if (ret) + goto err; + + return 0; + +err: + s3c_i2sv2_cleanup(dai, &s3c2412_i2s); + + return ret; +} + +static int s3c2412_i2s_remove(struct snd_soc_dai *dai) +{ + clk_disable_unprepare(s3c2412_i2s.iis_cclk); + s3c_i2sv2_cleanup(dai, &s3c2412_i2s); + + return 0; +} + +static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai); + u32 iismod; + + pr_debug("Entered %s\n", __func__); + + iismod = readl(i2s->regs + S3C2412_IISMOD); + pr_debug("%s: r: IISMOD: %x\n", __func__, iismod); + + switch (params_width(params)) { + case 8: + iismod |= S3C2412_IISMOD_8BIT; + break; + case 16: + iismod &= ~S3C2412_IISMOD_8BIT; + break; + } + + writel(iismod, i2s->regs + S3C2412_IISMOD); + pr_debug("%s: w: IISMOD: %x\n", __func__, iismod); + + return 0; +} + +#ifdef CONFIG_PM +static int s3c2412_i2s_suspend(struct snd_soc_component *component) +{ + struct s3c_i2sv2_info *i2s = snd_soc_component_get_drvdata(component); + u32 iismod; + + if (component->active) { + i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD); + i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON); + i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR); + + /* some basic suspend checks */ + + iismod = readl(i2s->regs + S3C2412_IISMOD); + + if (iismod & S3C2412_IISCON_RXDMA_ACTIVE) + pr_warn("%s: RXDMA active?\n", __func__); + + if (iismod & S3C2412_IISCON_TXDMA_ACTIVE) + pr_warn("%s: TXDMA active?\n", __func__); + + if (iismod & S3C2412_IISCON_IIS_ACTIVE) + pr_warn("%s: IIS active\n", __func__); + } + + return 0; +} + +static int s3c2412_i2s_resume(struct snd_soc_component *component) +{ + struct s3c_i2sv2_info *i2s = snd_soc_component_get_drvdata(component); + + pr_info("component_active %d, IISMOD %08x, IISCON %08x\n", + component->active, i2s->suspend_iismod, i2s->suspend_iiscon); + + if (component->active) { + writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON); + writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD); + writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR); + + writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH, + i2s->regs + S3C2412_IISFIC); + + ndelay(250); + writel(0x0, i2s->regs + S3C2412_IISFIC); + } + + return 0; +} +#else +#define s3c2412_i2s_suspend NULL +#define s3c2412_i2s_resume NULL +#endif + +#define S3C2412_I2S_RATES \ + (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \ + SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ + SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) + +static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = { + .hw_params = s3c2412_i2s_hw_params, +}; + +static struct snd_soc_dai_driver s3c2412_i2s_dai = { + .probe = s3c2412_i2s_probe, + .remove = s3c2412_i2s_remove, + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = S3C2412_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE, + }, + .capture = { + .channels_min = 2, + .channels_max = 2, + .rates = S3C2412_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE, + }, + .ops = &s3c2412_i2s_dai_ops, +}; + +static const struct snd_soc_component_driver s3c2412_i2s_component = { + .name = "s3c2412-i2s", + .suspend = s3c2412_i2s_suspend, + .resume = s3c2412_i2s_resume, +}; + +static int s3c2412_iis_dev_probe(struct platform_device *pdev) +{ + int ret = 0; + struct resource *res; + struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev); + + if (!pdata) { + dev_err(&pdev->dev, "missing platform data"); + return -ENXIO; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(s3c2412_i2s.regs)) + return PTR_ERR(s3c2412_i2s.regs); + + s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD; + s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback; + s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD; + s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture; + + ret = samsung_asoc_dma_platform_register(&pdev->dev, + pdata->dma_filter, + "tx", "rx", NULL); + if (ret) { + pr_err("failed to register the DMA: %d\n", ret); + return ret; + } + + ret = s3c_i2sv2_register_component(&pdev->dev, -1, + &s3c2412_i2s_component, + &s3c2412_i2s_dai); + if (ret) + pr_err("failed to register the dai\n"); + + return ret; +} + +static struct platform_driver s3c2412_iis_driver = { + .probe = s3c2412_iis_dev_probe, + .driver = { + .name = "s3c2412-iis", + }, +}; + +module_platform_driver(s3c2412_iis_driver); + +/* Module information */ +MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); +MODULE_DESCRIPTION("S3C2412 I2S SoC Interface"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s3c2412-iis"); |