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Diffstat (limited to 'sound/soc/samsung/s3c24xx-i2s.c')
-rw-r--r--sound/soc/samsung/s3c24xx-i2s.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/sound/soc/samsung/s3c24xx-i2s.c b/sound/soc/samsung/s3c24xx-i2s.c
new file mode 100644
index 000000000..50c08008a
--- /dev/null
+++ b/sound/soc/samsung/s3c24xx-i2s.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// s3c24xx-i2s.c -- ALSA Soc Audio Layer
+//
+// (c) 2006 Wolfson Microelectronics PLC.
+// Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+//
+// Copyright 2004-2005 Simtec Electronics
+// http://armlinux.simtec.co.uk/
+// Ben Dooks <ben@simtec.co.uk>
+
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+
+#include "regs-iis.h"
+#include "dma.h"
+#include "s3c24xx-i2s.h"
+
+static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_out = {
+ .chan_name = "tx",
+ .addr_width = 2,
+};
+
+static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_in = {
+ .chan_name = "rx",
+ .addr_width = 2,
+};
+
+struct s3c24xx_i2s_info {
+ void __iomem *regs;
+ struct clk *iis_clk;
+ u32 iiscon;
+ u32 iismod;
+ u32 iisfcon;
+ u32 iispsr;
+};
+static struct s3c24xx_i2s_info s3c24xx_i2s;
+
+static void s3c24xx_snd_txctrl(int on)
+{
+ u32 iisfcon;
+ u32 iiscon;
+ u32 iismod;
+
+ iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
+ iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
+ iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+
+ pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
+
+ if (on) {
+ iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
+ iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
+ iiscon &= ~S3C2410_IISCON_TXIDLE;
+ iismod |= S3C2410_IISMOD_TXMODE;
+
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
+ writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
+ } else {
+ /* note, we have to disable the FIFOs otherwise bad things
+ * seem to happen when the DMA stops. According to the
+ * Samsung supplied kernel, this should allow the DMA
+ * engine and FIFOs to reset. If this isn't allowed, the
+ * DMA engine will simply freeze randomly.
+ */
+
+ iisfcon &= ~S3C2410_IISFCON_TXENABLE;
+ iisfcon &= ~S3C2410_IISFCON_TXDMA;
+ iiscon |= S3C2410_IISCON_TXIDLE;
+ iiscon &= ~S3C2410_IISCON_TXDMAEN;
+ iismod &= ~S3C2410_IISMOD_TXMODE;
+
+ writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
+ writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ }
+
+ pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
+}
+
+static void s3c24xx_snd_rxctrl(int on)
+{
+ u32 iisfcon;
+ u32 iiscon;
+ u32 iismod;
+
+ iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
+ iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
+ iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+
+ pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
+
+ if (on) {
+ iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
+ iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
+ iiscon &= ~S3C2410_IISCON_RXIDLE;
+ iismod |= S3C2410_IISMOD_RXMODE;
+
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
+ writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
+ } else {
+ /* note, we have to disable the FIFOs otherwise bad things
+ * seem to happen when the DMA stops. According to the
+ * Samsung supplied kernel, this should allow the DMA
+ * engine and FIFOs to reset. If this isn't allowed, the
+ * DMA engine will simply freeze randomly.
+ */
+
+ iisfcon &= ~S3C2410_IISFCON_RXENABLE;
+ iisfcon &= ~S3C2410_IISFCON_RXDMA;
+ iiscon |= S3C2410_IISCON_RXIDLE;
+ iiscon &= ~S3C2410_IISCON_RXDMAEN;
+ iismod &= ~S3C2410_IISMOD_RXMODE;
+
+ writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
+ writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ }
+
+ pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
+}
+
+/*
+ * Wait for the LR signal to allow synchronisation to the L/R clock
+ * from the codec. May only be needed for slave mode.
+ */
+static int s3c24xx_snd_lrsync(void)
+{
+ u32 iiscon;
+ int timeout = 50; /* 5ms */
+
+ while (1) {
+ iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
+ if (iiscon & S3C2410_IISCON_LRINDEX)
+ break;
+
+ if (!timeout--)
+ return -ETIMEDOUT;
+ udelay(100);
+ }
+
+ return 0;
+}
+
+/*
+ * Check whether CPU is the master or slave
+ */
+static inline int s3c24xx_snd_is_clkmaster(void)
+{
+ return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
+}
+
+/*
+ * Set S3C24xx I2S DAI format
+ */
+static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ u32 iismod;
+
+ iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+ pr_debug("hw_params r: IISMOD: %x \n", iismod);
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ iismod |= S3C2410_IISMOD_SLAVE;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ iismod &= ~S3C2410_IISMOD_SLAVE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_LEFT_J:
+ iismod |= S3C2410_IISMOD_MSB;
+ break;
+ case SND_SOC_DAIFMT_I2S:
+ iismod &= ~S3C2410_IISMOD_MSB;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ pr_debug("hw_params w: IISMOD: %x \n", iismod);
+
+ return 0;
+}
+
+static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_dmaengine_dai_dma_data *dma_data;
+ u32 iismod;
+
+ dma_data = snd_soc_dai_get_dma_data(dai, substream);
+
+ /* Working copies of register */
+ iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+ pr_debug("hw_params r: IISMOD: %x\n", iismod);
+
+ switch (params_width(params)) {
+ case 8:
+ iismod &= ~S3C2410_IISMOD_16BIT;
+ dma_data->addr_width = 1;
+ break;
+ case 16:
+ iismod |= S3C2410_IISMOD_16BIT;
+ dma_data->addr_width = 2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ pr_debug("hw_params w: IISMOD: %x\n", iismod);
+
+ return 0;
+}
+
+static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (!s3c24xx_snd_is_clkmaster()) {
+ ret = s3c24xx_snd_lrsync();
+ if (ret)
+ goto exit_err;
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ s3c24xx_snd_rxctrl(1);
+ else
+ s3c24xx_snd_txctrl(1);
+
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ s3c24xx_snd_rxctrl(0);
+ else
+ s3c24xx_snd_txctrl(0);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+exit_err:
+ return ret;
+}
+
+/*
+ * Set S3C24xx Clock source
+ */
+static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+
+ iismod &= ~S3C2440_IISMOD_MPLL;
+
+ switch (clk_id) {
+ case S3C24XX_CLKSRC_PCLK:
+ break;
+ case S3C24XX_CLKSRC_MPLL:
+ iismod |= S3C2440_IISMOD_MPLL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ return 0;
+}
+
+/*
+ * Set S3C24xx Clock dividers
+ */
+static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
+ int div_id, int div)
+{
+ u32 reg;
+
+ switch (div_id) {
+ case S3C24XX_DIV_BCLK:
+ reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
+ writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ break;
+ case S3C24XX_DIV_MCLK:
+ reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
+ writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ break;
+ case S3C24XX_DIV_PRESCALER:
+ writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
+ reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
+ writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * To avoid duplicating clock code, allow machine driver to
+ * get the clockrate from here.
+ */
+u32 s3c24xx_i2s_get_clockrate(void)
+{
+ return clk_get_rate(s3c24xx_i2s.iis_clk);
+}
+EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
+
+static int s3c24xx_i2s_probe(struct snd_soc_dai *dai)
+{
+ int ret;
+ snd_soc_dai_init_dma_data(dai, &s3c24xx_i2s_pcm_stereo_out,
+ &s3c24xx_i2s_pcm_stereo_in);
+
+ s3c24xx_i2s.iis_clk = devm_clk_get(dai->dev, "iis");
+ if (IS_ERR(s3c24xx_i2s.iis_clk)) {
+ pr_err("failed to get iis_clock\n");
+ return PTR_ERR(s3c24xx_i2s.iis_clk);
+ }
+ ret = clk_prepare_enable(s3c24xx_i2s.iis_clk);
+ if (ret)
+ return ret;
+
+ writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
+
+ s3c24xx_snd_txctrl(0);
+ s3c24xx_snd_rxctrl(0);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3c24xx_i2s_suspend(struct snd_soc_component *component)
+{
+ s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
+ s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+ s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
+ s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
+
+ clk_disable_unprepare(s3c24xx_i2s.iis_clk);
+
+ return 0;
+}
+
+static int s3c24xx_i2s_resume(struct snd_soc_component *component)
+{
+ int ret;
+
+ ret = clk_prepare_enable(s3c24xx_i2s.iis_clk);
+ if (ret)
+ return ret;
+
+ writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
+ writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+ writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
+ writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
+
+ return 0;
+}
+#else
+#define s3c24xx_i2s_suspend NULL
+#define s3c24xx_i2s_resume NULL
+#endif
+
+#define S3C24XX_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 s3c24xx_i2s_dai_ops = {
+ .trigger = s3c24xx_i2s_trigger,
+ .hw_params = s3c24xx_i2s_hw_params,
+ .set_fmt = s3c24xx_i2s_set_fmt,
+ .set_clkdiv = s3c24xx_i2s_set_clkdiv,
+ .set_sysclk = s3c24xx_i2s_set_sysclk,
+};
+
+static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
+ .probe = s3c24xx_i2s_probe,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = S3C24XX_I2S_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = S3C24XX_I2S_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
+ .ops = &s3c24xx_i2s_dai_ops,
+};
+
+static const struct snd_soc_component_driver s3c24xx_i2s_component = {
+ .name = "s3c24xx-i2s",
+ .suspend = s3c24xx_i2s_suspend,
+ .resume = s3c24xx_i2s_resume,
+};
+
+static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ s3c24xx_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(s3c24xx_i2s.regs))
+ return PTR_ERR(s3c24xx_i2s.regs);
+
+ s3c24xx_i2s_pcm_stereo_out.addr = res->start + S3C2410_IISFIFO;
+ s3c24xx_i2s_pcm_stereo_in.addr = res->start + S3C2410_IISFIFO;
+
+ ret = samsung_asoc_dma_platform_register(&pdev->dev, NULL,
+ "tx", "rx", NULL);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register the DMA: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &s3c24xx_i2s_component, &s3c24xx_i2s_dai, 1);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to register the DAI\n");
+
+ return ret;
+}
+
+static struct platform_driver s3c24xx_iis_driver = {
+ .probe = s3c24xx_iis_dev_probe,
+ .driver = {
+ .name = "s3c24xx-iis",
+ },
+};
+
+module_platform_driver(s3c24xx_iis_driver);
+
+/* Module information */
+MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c24xx-iis");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 02:02:25 +0000