493 строки
12 KiB
C
493 строки
12 KiB
C
// 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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* @save_clkcon: Backup clkcon reg. in suspend.
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* @save_con: Backup con reg. in suspend.
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* @save_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 = substream->private_data;
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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 = substream->private_data;
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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 = substream->private_data;
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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, <sw.youn@samsung.com>");
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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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