| /* sound/soc/samsung/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 <linux/module.h> |
| |
| #include <sound/soc.h> |
| #include <sound/pcm_params.h> |
| |
| #include <plat/audio.h> |
| #include <mach/dma.h> |
| |
| #include "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 const struct snd_soc_dai_ops spdif_dai_ops = { |
| .set_sysclk = spdif_set_sysclk, |
| .trigger = spdif_trigger, |
| .hw_params = spdif_hw_params, |
| .shutdown = spdif_shutdown, |
| }; |
| |
| static 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 = __devexit_p(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"); |