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492 lines
12 KiB
492 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// ALSA SoC Audio Layer - Samsung S/PDIF Controller driver |
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// |
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// Copyright (c) 2010 Samsung Electronics Co. Ltd |
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// http://www.samsung.com/ |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <sound/soc.h> |
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#include <sound/pcm_params.h> |
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#include <linux/platform_data/asoc-s3c.h> |
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#include "dma.h" |
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#include "spdif.h" |
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/* Registers */ |
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#define CLKCON 0x00 |
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#define CON 0x04 |
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#define BSTAS 0x08 |
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#define CSTAS 0x0C |
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#define DATA_OUTBUF 0x10 |
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#define DCNT 0x14 |
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#define BSTAS_S 0x18 |
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#define DCNT_S 0x1C |
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#define CLKCTL_MASK 0x7 |
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#define CLKCTL_MCLK_EXT (0x1 << 2) |
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#define CLKCTL_PWR_ON (0x1 << 0) |
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#define CON_MASK 0x3ffffff |
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#define CON_FIFO_TH_SHIFT 19 |
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#define CON_FIFO_TH_MASK (0x7 << 19) |
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#define CON_USERDATA_23RDBIT (0x1 << 12) |
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#define CON_SW_RESET (0x1 << 5) |
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#define CON_MCLKDIV_MASK (0x3 << 3) |
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#define CON_MCLKDIV_256FS (0x0 << 3) |
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#define CON_MCLKDIV_384FS (0x1 << 3) |
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#define CON_MCLKDIV_512FS (0x2 << 3) |
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#define CON_PCM_MASK (0x3 << 1) |
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#define CON_PCM_16BIT (0x0 << 1) |
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#define CON_PCM_20BIT (0x1 << 1) |
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#define CON_PCM_24BIT (0x2 << 1) |
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#define CON_PCM_DATA (0x1 << 0) |
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#define CSTAS_MASK 0x3fffffff |
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#define CSTAS_SAMP_FREQ_MASK (0xF << 24) |
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#define CSTAS_SAMP_FREQ_44 (0x0 << 24) |
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#define CSTAS_SAMP_FREQ_48 (0x2 << 24) |
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#define CSTAS_SAMP_FREQ_32 (0x3 << 24) |
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#define CSTAS_SAMP_FREQ_96 (0xA << 24) |
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#define CSTAS_CATEGORY_MASK (0xFF << 8) |
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#define CSTAS_CATEGORY_CODE_CDP (0x01 << 8) |
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#define CSTAS_NO_COPYRIGHT (0x1 << 2) |
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/** |
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* struct samsung_spdif_info - Samsung S/PDIF Controller information |
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* @lock: Spin lock for S/PDIF. |
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* @dev: The parent device passed to use from the probe. |
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* @regs: The pointer to the device register block. |
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* @clk_rate: Current clock rate for calcurate ratio. |
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* @pclk: The peri-clock pointer for spdif master operation. |
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* @sclk: The source clock pointer for making sync signals. |
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* @saved_clkcon: Backup clkcon reg. in suspend. |
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* @saved_con: Backup con reg. in suspend. |
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* @saved_cstas: Backup cstas reg. in suspend. |
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* @dma_playback: DMA information for playback channel. |
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*/ |
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struct samsung_spdif_info { |
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spinlock_t lock; |
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struct device *dev; |
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void __iomem *regs; |
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unsigned long clk_rate; |
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struct clk *pclk; |
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struct clk *sclk; |
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u32 saved_clkcon; |
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u32 saved_con; |
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u32 saved_cstas; |
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struct snd_dmaengine_dai_dma_data *dma_playback; |
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}; |
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static struct snd_dmaengine_dai_dma_data spdif_stereo_out; |
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static struct samsung_spdif_info spdif_info; |
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static inline struct samsung_spdif_info |
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*component_to_info(struct snd_soc_component *component) |
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{ |
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return snd_soc_component_get_drvdata(component); |
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} |
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static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai) |
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{ |
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return snd_soc_dai_get_drvdata(cpu_dai); |
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} |
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static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on) |
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{ |
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void __iomem *regs = spdif->regs; |
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u32 clkcon; |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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clkcon = readl(regs + CLKCON) & CLKCTL_MASK; |
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if (on) |
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writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON); |
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else |
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writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); |
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} |
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static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai, |
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int clk_id, unsigned int freq, int dir) |
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{ |
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struct samsung_spdif_info *spdif = to_info(cpu_dai); |
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u32 clkcon; |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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clkcon = readl(spdif->regs + CLKCON); |
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if (clk_id == SND_SOC_SPDIF_INT_MCLK) |
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clkcon &= ~CLKCTL_MCLK_EXT; |
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else |
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clkcon |= CLKCTL_MCLK_EXT; |
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writel(clkcon, spdif->regs + CLKCON); |
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spdif->clk_rate = freq; |
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return 0; |
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} |
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static int spdif_trigger(struct snd_pcm_substream *substream, int cmd, |
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struct snd_soc_dai *dai) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct samsung_spdif_info *spdif = to_info(asoc_rtd_to_cpu(rtd, 0)); |
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unsigned long flags; |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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spin_lock_irqsave(&spdif->lock, flags); |
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spdif_snd_txctrl(spdif, 1); |
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spin_unlock_irqrestore(&spdif->lock, flags); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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spin_lock_irqsave(&spdif->lock, flags); |
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spdif_snd_txctrl(spdif, 0); |
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spin_unlock_irqrestore(&spdif->lock, flags); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int spdif_sysclk_ratios[] = { |
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512, 384, 256, |
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}; |
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static int spdif_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *socdai) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct samsung_spdif_info *spdif = to_info(asoc_rtd_to_cpu(rtd, 0)); |
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void __iomem *regs = spdif->regs; |
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struct snd_dmaengine_dai_dma_data *dma_data; |
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u32 con, clkcon, cstas; |
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unsigned long flags; |
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int i, ratio; |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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dma_data = spdif->dma_playback; |
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else { |
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dev_err(spdif->dev, "Capture is not supported\n"); |
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return -EINVAL; |
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} |
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snd_soc_dai_set_dma_data(asoc_rtd_to_cpu(rtd, 0), substream, dma_data); |
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spin_lock_irqsave(&spdif->lock, flags); |
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con = readl(regs + CON) & CON_MASK; |
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cstas = readl(regs + CSTAS) & CSTAS_MASK; |
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clkcon = readl(regs + CLKCON) & CLKCTL_MASK; |
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con &= ~CON_FIFO_TH_MASK; |
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con |= (0x7 << CON_FIFO_TH_SHIFT); |
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con |= CON_USERDATA_23RDBIT; |
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con |= CON_PCM_DATA; |
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con &= ~CON_PCM_MASK; |
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switch (params_width(params)) { |
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case 16: |
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con |= CON_PCM_16BIT; |
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break; |
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default: |
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dev_err(spdif->dev, "Unsupported data size.\n"); |
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goto err; |
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} |
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ratio = spdif->clk_rate / params_rate(params); |
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for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++) |
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if (ratio == spdif_sysclk_ratios[i]) |
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break; |
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if (i == ARRAY_SIZE(spdif_sysclk_ratios)) { |
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dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n", |
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spdif->clk_rate, params_rate(params)); |
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goto err; |
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} |
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con &= ~CON_MCLKDIV_MASK; |
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switch (ratio) { |
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case 256: |
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con |= CON_MCLKDIV_256FS; |
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break; |
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case 384: |
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con |= CON_MCLKDIV_384FS; |
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break; |
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case 512: |
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con |= CON_MCLKDIV_512FS; |
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break; |
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} |
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cstas &= ~CSTAS_SAMP_FREQ_MASK; |
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switch (params_rate(params)) { |
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case 44100: |
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cstas |= CSTAS_SAMP_FREQ_44; |
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break; |
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case 48000: |
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cstas |= CSTAS_SAMP_FREQ_48; |
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break; |
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case 32000: |
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cstas |= CSTAS_SAMP_FREQ_32; |
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break; |
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case 96000: |
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cstas |= CSTAS_SAMP_FREQ_96; |
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break; |
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default: |
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dev_err(spdif->dev, "Invalid sampling rate %d\n", |
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params_rate(params)); |
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goto err; |
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} |
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cstas &= ~CSTAS_CATEGORY_MASK; |
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cstas |= CSTAS_CATEGORY_CODE_CDP; |
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cstas |= CSTAS_NO_COPYRIGHT; |
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writel(con, regs + CON); |
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writel(cstas, regs + CSTAS); |
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writel(clkcon, regs + CLKCON); |
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spin_unlock_irqrestore(&spdif->lock, flags); |
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return 0; |
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err: |
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spin_unlock_irqrestore(&spdif->lock, flags); |
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return -EINVAL; |
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} |
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static void spdif_shutdown(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct samsung_spdif_info *spdif = to_info(asoc_rtd_to_cpu(rtd, 0)); |
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void __iomem *regs = spdif->regs; |
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u32 con, clkcon; |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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con = readl(regs + CON) & CON_MASK; |
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clkcon = readl(regs + CLKCON) & CLKCTL_MASK; |
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writel(con | CON_SW_RESET, regs + CON); |
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cpu_relax(); |
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writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); |
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} |
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#ifdef CONFIG_PM |
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static int spdif_suspend(struct snd_soc_component *component) |
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{ |
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struct samsung_spdif_info *spdif = component_to_info(component); |
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u32 con = spdif->saved_con; |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK; |
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spdif->saved_con = readl(spdif->regs + CON) & CON_MASK; |
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spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK; |
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writel(con | CON_SW_RESET, spdif->regs + CON); |
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cpu_relax(); |
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return 0; |
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} |
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static int spdif_resume(struct snd_soc_component *component) |
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{ |
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struct samsung_spdif_info *spdif = component_to_info(component); |
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dev_dbg(spdif->dev, "Entered %s\n", __func__); |
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writel(spdif->saved_clkcon, spdif->regs + CLKCON); |
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writel(spdif->saved_con, spdif->regs + CON); |
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writel(spdif->saved_cstas, spdif->regs + CSTAS); |
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return 0; |
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} |
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#else |
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#define spdif_suspend NULL |
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#define spdif_resume NULL |
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#endif |
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static const struct snd_soc_dai_ops spdif_dai_ops = { |
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.set_sysclk = spdif_set_sysclk, |
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.trigger = spdif_trigger, |
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.hw_params = spdif_hw_params, |
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.shutdown = spdif_shutdown, |
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}; |
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static struct snd_soc_dai_driver samsung_spdif_dai = { |
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.name = "samsung-spdif", |
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.playback = { |
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.stream_name = "S/PDIF Playback", |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = (SNDRV_PCM_RATE_32000 | |
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SNDRV_PCM_RATE_44100 | |
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SNDRV_PCM_RATE_48000 | |
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SNDRV_PCM_RATE_96000), |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, }, |
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.ops = &spdif_dai_ops, |
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}; |
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static const struct snd_soc_component_driver samsung_spdif_component = { |
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.name = "samsung-spdif", |
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.suspend = spdif_suspend, |
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.resume = spdif_resume, |
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}; |
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static int spdif_probe(struct platform_device *pdev) |
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{ |
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struct s3c_audio_pdata *spdif_pdata; |
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struct resource *mem_res; |
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struct samsung_spdif_info *spdif; |
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dma_filter_fn filter; |
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int ret; |
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spdif_pdata = pdev->dev.platform_data; |
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dev_dbg(&pdev->dev, "Entered %s\n", __func__); |
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mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!mem_res) { |
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dev_err(&pdev->dev, "Unable to get register resource.\n"); |
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return -ENXIO; |
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} |
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if (spdif_pdata && spdif_pdata->cfg_gpio |
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&& spdif_pdata->cfg_gpio(pdev)) { |
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dev_err(&pdev->dev, "Unable to configure GPIO pins\n"); |
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return -EINVAL; |
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} |
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spdif = &spdif_info; |
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spdif->dev = &pdev->dev; |
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spin_lock_init(&spdif->lock); |
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spdif->pclk = devm_clk_get(&pdev->dev, "spdif"); |
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if (IS_ERR(spdif->pclk)) { |
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dev_err(&pdev->dev, "failed to get peri-clock\n"); |
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ret = -ENOENT; |
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goto err0; |
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} |
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ret = clk_prepare_enable(spdif->pclk); |
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if (ret) |
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goto err0; |
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spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif"); |
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if (IS_ERR(spdif->sclk)) { |
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dev_err(&pdev->dev, "failed to get internal source clock\n"); |
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ret = -ENOENT; |
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goto err1; |
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} |
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ret = clk_prepare_enable(spdif->sclk); |
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if (ret) |
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goto err1; |
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/* Request S/PDIF Register's memory region */ |
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if (!request_mem_region(mem_res->start, |
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resource_size(mem_res), "samsung-spdif")) { |
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dev_err(&pdev->dev, "Unable to request register region\n"); |
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ret = -EBUSY; |
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goto err2; |
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} |
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spdif->regs = ioremap(mem_res->start, 0x100); |
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if (spdif->regs == NULL) { |
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dev_err(&pdev->dev, "Cannot ioremap registers\n"); |
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ret = -ENXIO; |
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goto err3; |
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} |
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spdif_stereo_out.addr_width = 2; |
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spdif_stereo_out.addr = mem_res->start + DATA_OUTBUF; |
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filter = NULL; |
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if (spdif_pdata) { |
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spdif_stereo_out.filter_data = spdif_pdata->dma_playback; |
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filter = spdif_pdata->dma_filter; |
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} |
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spdif->dma_playback = &spdif_stereo_out; |
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ret = samsung_asoc_dma_platform_register(&pdev->dev, filter, |
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NULL, NULL, NULL); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to register DMA: %d\n", ret); |
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goto err4; |
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} |
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dev_set_drvdata(&pdev->dev, spdif); |
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ret = devm_snd_soc_register_component(&pdev->dev, |
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&samsung_spdif_component, &samsung_spdif_dai, 1); |
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if (ret != 0) { |
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dev_err(&pdev->dev, "fail to register dai\n"); |
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goto err4; |
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} |
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return 0; |
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err4: |
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iounmap(spdif->regs); |
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err3: |
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release_mem_region(mem_res->start, resource_size(mem_res)); |
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err2: |
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clk_disable_unprepare(spdif->sclk); |
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err1: |
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clk_disable_unprepare(spdif->pclk); |
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err0: |
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return ret; |
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} |
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static int spdif_remove(struct platform_device *pdev) |
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{ |
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struct samsung_spdif_info *spdif = &spdif_info; |
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struct resource *mem_res; |
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iounmap(spdif->regs); |
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mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (mem_res) |
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release_mem_region(mem_res->start, resource_size(mem_res)); |
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clk_disable_unprepare(spdif->sclk); |
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clk_disable_unprepare(spdif->pclk); |
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return 0; |
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} |
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static struct platform_driver samsung_spdif_driver = { |
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.probe = spdif_probe, |
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.remove = spdif_remove, |
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.driver = { |
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.name = "samsung-spdif", |
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}, |
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}; |
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module_platform_driver(samsung_spdif_driver); |
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MODULE_AUTHOR("Seungwhan Youn, <[email protected]>"); |
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MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:samsung-spdif");
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