/* 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, }, }; module_platform_driver(samsung_spdif_driver); MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>"); MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:samsung-spdif");