--- /dev/null
+/* sound/soc/s3c24xx/spdif.c
+ *
+ * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
+ *
+ * Copyright (c) 2010 Samsung Electronics Co. Ltd
+ * http://www.samsung.com/
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <plat/audio.h>
+#include <mach/dma.h>
+
+#include "s3c-dma.h"
+#include "spdif.h"
+
+/* Registers */
+#define CLKCON 0x00
+#define CON 0x04
+#define BSTAS 0x08
+#define CSTAS 0x0C
+#define DATA_OUTBUF 0x10
+#define DCNT 0x14
+#define BSTAS_S 0x18
+#define DCNT_S 0x1C
+
+#define CLKCTL_MASK 0x7
+#define CLKCTL_MCLK_EXT (0x1 << 2)
+#define CLKCTL_PWR_ON (0x1 << 0)
+
+#define CON_MASK 0x3ffffff
+#define CON_FIFO_TH_SHIFT 19
+#define CON_FIFO_TH_MASK (0x7 << 19)
+#define CON_USERDATA_23RDBIT (0x1 << 12)
+
+#define CON_SW_RESET (0x1 << 5)
+
+#define CON_MCLKDIV_MASK (0x3 << 3)
+#define CON_MCLKDIV_256FS (0x0 << 3)
+#define CON_MCLKDIV_384FS (0x1 << 3)
+#define CON_MCLKDIV_512FS (0x2 << 3)
+
+#define CON_PCM_MASK (0x3 << 1)
+#define CON_PCM_16BIT (0x0 << 1)
+#define CON_PCM_20BIT (0x1 << 1)
+#define CON_PCM_24BIT (0x2 << 1)
+
+#define CON_PCM_DATA (0x1 << 0)
+
+#define CSTAS_MASK 0x3fffffff
+#define CSTAS_SAMP_FREQ_MASK (0xF << 24)
+#define CSTAS_SAMP_FREQ_44 (0x0 << 24)
+#define CSTAS_SAMP_FREQ_48 (0x2 << 24)
+#define CSTAS_SAMP_FREQ_32 (0x3 << 24)
+#define CSTAS_SAMP_FREQ_96 (0xA << 24)
+
+#define CSTAS_CATEGORY_MASK (0xFF << 8)
+#define CSTAS_CATEGORY_CODE_CDP (0x01 << 8)
+
+#define CSTAS_NO_COPYRIGHT (0x1 << 2)
+
+/**
+ * struct samsung_spdif_info - Samsung S/PDIF Controller information
+ * @lock: Spin lock for S/PDIF.
+ * @dev: The parent device passed to use from the probe.
+ * @regs: The pointer to the device register block.
+ * @clk_rate: Current clock rate for calcurate ratio.
+ * @pclk: The peri-clock pointer for spdif master operation.
+ * @sclk: The source clock pointer for making sync signals.
+ * @save_clkcon: Backup clkcon reg. in suspend.
+ * @save_con: Backup con reg. in suspend.
+ * @save_cstas: Backup cstas reg. in suspend.
+ * @dma_playback: DMA information for playback channel.
+ */
+struct samsung_spdif_info {
+ spinlock_t lock;
+ struct device *dev;
+ void __iomem *regs;
+ unsigned long clk_rate;
+ struct clk *pclk;
+ struct clk *sclk;
+ u32 saved_clkcon;
+ u32 saved_con;
+ u32 saved_cstas;
+ struct s3c_dma_params *dma_playback;
+};
+
+static struct s3c2410_dma_client spdif_dma_client_out = {
+ .name = "S/PDIF Stereo out",
+};
+
+static struct s3c_dma_params spdif_stereo_out;
+static struct samsung_spdif_info spdif_info;
+
+static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
+{
+ return snd_soc_dai_get_drvdata(cpu_dai);
+}
+
+static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
+{
+ void __iomem *regs = spdif->regs;
+ u32 clkcon;
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
+ if (on)
+ writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
+ else
+ writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
+}
+
+static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct samsung_spdif_info *spdif = to_info(cpu_dai);
+ u32 clkcon;
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ clkcon = readl(spdif->regs + CLKCON);
+
+ if (clk_id == SND_SOC_SPDIF_INT_MCLK)
+ clkcon &= ~CLKCTL_MCLK_EXT;
+ else
+ clkcon |= CLKCTL_MCLK_EXT;
+
+ writel(clkcon, spdif->regs + CLKCON);
+
+ spdif->clk_rate = freq;
+
+ return 0;
+}
+
+static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
+ unsigned long flags;
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ spin_lock_irqsave(&spdif->lock, flags);
+ spdif_snd_txctrl(spdif, 1);
+ spin_unlock_irqrestore(&spdif->lock, flags);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ spin_lock_irqsave(&spdif->lock, flags);
+ spdif_snd_txctrl(spdif, 0);
+ spin_unlock_irqrestore(&spdif->lock, flags);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int spdif_sysclk_ratios[] = {
+ 512, 384, 256,
+};
+
+static int spdif_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *socdai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
+ void __iomem *regs = spdif->regs;
+ struct s3c_dma_params *dma_data;
+ u32 con, clkcon, cstas;
+ unsigned long flags;
+ int i, ratio;
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ dma_data = spdif->dma_playback;
+ else {
+ dev_err(spdif->dev, "Capture is not supported\n");
+ return -EINVAL;
+ }
+
+ snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
+
+ spin_lock_irqsave(&spdif->lock, flags);
+
+ con = readl(regs + CON) & CON_MASK;
+ cstas = readl(regs + CSTAS) & CSTAS_MASK;
+ clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
+
+ con &= ~CON_FIFO_TH_MASK;
+ con |= (0x7 << CON_FIFO_TH_SHIFT);
+ con |= CON_USERDATA_23RDBIT;
+ con |= CON_PCM_DATA;
+
+ con &= ~CON_PCM_MASK;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ con |= CON_PCM_16BIT;
+ break;
+ default:
+ dev_err(spdif->dev, "Unsupported data size.\n");
+ goto err;
+ }
+
+ ratio = spdif->clk_rate / params_rate(params);
+ for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
+ if (ratio == spdif_sysclk_ratios[i])
+ break;
+ if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
+ dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
+ spdif->clk_rate, params_rate(params));
+ goto err;
+ }
+
+ con &= ~CON_MCLKDIV_MASK;
+ switch (ratio) {
+ case 256:
+ con |= CON_MCLKDIV_256FS;
+ break;
+ case 384:
+ con |= CON_MCLKDIV_384FS;
+ break;
+ case 512:
+ con |= CON_MCLKDIV_512FS;
+ break;
+ }
+
+ cstas &= ~CSTAS_SAMP_FREQ_MASK;
+ switch (params_rate(params)) {
+ case 44100:
+ cstas |= CSTAS_SAMP_FREQ_44;
+ break;
+ case 48000:
+ cstas |= CSTAS_SAMP_FREQ_48;
+ break;
+ case 32000:
+ cstas |= CSTAS_SAMP_FREQ_32;
+ break;
+ case 96000:
+ cstas |= CSTAS_SAMP_FREQ_96;
+ break;
+ default:
+ dev_err(spdif->dev, "Invalid sampling rate %d\n",
+ params_rate(params));
+ goto err;
+ }
+
+ cstas &= ~CSTAS_CATEGORY_MASK;
+ cstas |= CSTAS_CATEGORY_CODE_CDP;
+ cstas |= CSTAS_NO_COPYRIGHT;
+
+ writel(con, regs + CON);
+ writel(cstas, regs + CSTAS);
+ writel(clkcon, regs + CLKCON);
+
+ spin_unlock_irqrestore(&spdif->lock, flags);
+
+ return 0;
+err:
+ spin_unlock_irqrestore(&spdif->lock, flags);
+ return -EINVAL;
+}
+
+static void spdif_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
+ void __iomem *regs = spdif->regs;
+ u32 con, clkcon;
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ con = readl(regs + CON) & CON_MASK;
+ clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
+
+ writel(con | CON_SW_RESET, regs + CON);
+ cpu_relax();
+
+ writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
+}
+
+#ifdef CONFIG_PM
+static int spdif_suspend(struct snd_soc_dai *cpu_dai)
+{
+ struct samsung_spdif_info *spdif = to_info(cpu_dai);
+ u32 con = spdif->saved_con;
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
+ spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
+ spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
+
+ writel(con | CON_SW_RESET, spdif->regs + CON);
+ cpu_relax();
+
+ return 0;
+}
+
+static int spdif_resume(struct snd_soc_dai *cpu_dai)
+{
+ struct samsung_spdif_info *spdif = to_info(cpu_dai);
+
+ dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+ writel(spdif->saved_clkcon, spdif->regs + CLKCON);
+ writel(spdif->saved_con, spdif->regs + CON);
+ writel(spdif->saved_cstas, spdif->regs + CSTAS);
+
+ return 0;
+}
+#else
+#define spdif_suspend NULL
+#define spdif_resume NULL
+#endif
+
+static struct snd_soc_dai_ops spdif_dai_ops = {
+ .set_sysclk = spdif_set_sysclk,
+ .trigger = spdif_trigger,
+ .hw_params = spdif_hw_params,
+ .shutdown = spdif_shutdown,
+};
+
+struct snd_soc_dai_driver samsung_spdif_dai = {
+ .name = "samsung-spdif",
+ .playback = {
+ .stream_name = "S/PDIF Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = (SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_96000),
+ .formats = SNDRV_PCM_FMTBIT_S16_LE, },
+ .ops = &spdif_dai_ops,
+ .suspend = spdif_suspend,
+ .resume = spdif_resume,
+};
+
+static __devinit int spdif_probe(struct platform_device *pdev)
+{
+ struct s3c_audio_pdata *spdif_pdata;
+ struct resource *mem_res, *dma_res;
+ struct samsung_spdif_info *spdif;
+ int ret;
+
+ spdif_pdata = pdev->dev.platform_data;
+
+ dev_dbg(&pdev->dev, "Entered %s\n", __func__);
+
+ dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!dma_res) {
+ dev_err(&pdev->dev, "Unable to get dma resource.\n");
+ return -ENXIO;
+ }
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem_res) {
+ dev_err(&pdev->dev, "Unable to get register resource.\n");
+ return -ENXIO;
+ }
+
+ if (spdif_pdata && spdif_pdata->cfg_gpio
+ && spdif_pdata->cfg_gpio(pdev)) {
+ dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
+ return -EINVAL;
+ }
+
+ spdif = &spdif_info;
+ spdif->dev = &pdev->dev;
+
+ spin_lock_init(&spdif->lock);
+
+ spdif->pclk = clk_get(&pdev->dev, "spdif");
+ if (IS_ERR(spdif->pclk)) {
+ dev_err(&pdev->dev, "failed to get peri-clock\n");
+ ret = -ENOENT;
+ goto err0;
+ }
+ clk_enable(spdif->pclk);
+
+ spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
+ if (IS_ERR(spdif->sclk)) {
+ dev_err(&pdev->dev, "failed to get internal source clock\n");
+ ret = -ENOENT;
+ goto err1;
+ }
+ clk_enable(spdif->sclk);
+
+ /* Request S/PDIF Register's memory region */
+ if (!request_mem_region(mem_res->start,
+ resource_size(mem_res), "samsung-spdif")) {
+ dev_err(&pdev->dev, "Unable to request register region\n");
+ ret = -EBUSY;
+ goto err2;
+ }
+
+ spdif->regs = ioremap(mem_res->start, 0x100);
+ if (spdif->regs == NULL) {
+ dev_err(&pdev->dev, "Cannot ioremap registers\n");
+ ret = -ENXIO;
+ goto err3;
+ }
+
+ dev_set_drvdata(&pdev->dev, spdif);
+
+ ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "fail to register dai\n");
+ goto err4;
+ }
+
+ spdif_stereo_out.dma_size = 2;
+ spdif_stereo_out.client = &spdif_dma_client_out;
+ spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
+ spdif_stereo_out.channel = dma_res->start;
+
+ spdif->dma_playback = &spdif_stereo_out;
+
+ return 0;
+
+err4:
+ iounmap(spdif->regs);
+err3:
+ release_mem_region(mem_res->start, resource_size(mem_res));
+err2:
+ clk_disable(spdif->sclk);
+ clk_put(spdif->sclk);
+err1:
+ clk_disable(spdif->pclk);
+ clk_put(spdif->pclk);
+err0:
+ return ret;
+}
+
+static __devexit int spdif_remove(struct platform_device *pdev)
+{
+ struct samsung_spdif_info *spdif = &spdif_info;
+ struct resource *mem_res;
+
+ snd_soc_unregister_dai(&pdev->dev);
+
+ iounmap(spdif->regs);
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (mem_res)
+ release_mem_region(mem_res->start, resource_size(mem_res));
+
+ clk_disable(spdif->sclk);
+ clk_put(spdif->sclk);
+ clk_disable(spdif->pclk);
+ clk_put(spdif->pclk);
+
+ return 0;
+}
+
+static struct platform_driver samsung_spdif_driver = {
+ .probe = spdif_probe,
+ .remove = spdif_remove,
+ .driver = {
+ .name = "samsung-spdif",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init spdif_init(void)
+{
+ return platform_driver_register(&samsung_spdif_driver);
+}
+module_init(spdif_init);
+
+static void __exit spdif_exit(void)
+{
+ platform_driver_unregister(&samsung_spdif_driver);
+}
+module_exit(spdif_exit);
+
+MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
+MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:samsung-spdif");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff