/* * linux/sound/soc/ep93xx-i2s.c * EP93xx I2S driver * * Copyright (C) 2010 Ryan Mallon * * Based on the original driver by: * Copyright (C) 2007 Chase Douglas * Copyright (C) 2006 Lennert Buytenhek * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #define EP93XX_I2S_TXCLKCFG 0x00 #define EP93XX_I2S_RXCLKCFG 0x04 #define EP93XX_I2S_GLCTRL 0x0C #define EP93XX_I2S_TXLINCTRLDATA 0x28 #define EP93XX_I2S_TXCTRL 0x2C #define EP93XX_I2S_TXWRDLEN 0x30 #define EP93XX_I2S_TX0EN 0x34 #define EP93XX_I2S_RXLINCTRLDATA 0x58 #define EP93XX_I2S_RXCTRL 0x5C #define EP93XX_I2S_RXWRDLEN 0x60 #define EP93XX_I2S_RX0EN 0x64 #define EP93XX_I2S_WRDLEN_16 (0 << 0) #define EP93XX_I2S_WRDLEN_24 (1 << 0) #define EP93XX_I2S_WRDLEN_32 (2 << 0) #define EP93XX_I2S_LINCTRLDATA_R_JUST (1 << 2) /* Right justify */ #define EP93XX_I2S_CLKCFG_LRS (1 << 0) /* lrclk polarity */ #define EP93XX_I2S_CLKCFG_CKP (1 << 1) /* Bit clock polarity */ #define EP93XX_I2S_CLKCFG_REL (1 << 2) /* First bit transition */ #define EP93XX_I2S_CLKCFG_MASTER (1 << 3) /* Master mode */ #define EP93XX_I2S_CLKCFG_NBCG (1 << 4) /* Not bit clock gating */ struct ep93xx_i2s_info { struct clk *mclk; struct clk *sclk; struct clk *lrclk; struct ep93xx_dma_data *dma_data; void __iomem *regs; }; struct ep93xx_dma_data ep93xx_i2s_dma_data[] = { [SNDRV_PCM_STREAM_PLAYBACK] = { .name = "i2s-pcm-out", .port = EP93XX_DMA_I2S1, .direction = DMA_MEM_TO_DEV, }, [SNDRV_PCM_STREAM_CAPTURE] = { .name = "i2s-pcm-in", .port = EP93XX_DMA_I2S1, .direction = DMA_DEV_TO_MEM, }, }; static inline void ep93xx_i2s_write_reg(struct ep93xx_i2s_info *info, unsigned reg, unsigned val) { __raw_writel(val, info->regs + reg); } static inline unsigned ep93xx_i2s_read_reg(struct ep93xx_i2s_info *info, unsigned reg) { return __raw_readl(info->regs + reg); } static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream) { unsigned base_reg; int i; if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 && (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) { /* Enable clocks */ clk_enable(info->mclk); clk_enable(info->sclk); clk_enable(info->lrclk); /* Enable i2s */ ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 1); } /* Enable fifos */ if (stream == SNDRV_PCM_STREAM_PLAYBACK) base_reg = EP93XX_I2S_TX0EN; else base_reg = EP93XX_I2S_RX0EN; for (i = 0; i < 3; i++) ep93xx_i2s_write_reg(info, base_reg + (i * 4), 1); } static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream) { unsigned base_reg; int i; /* Disable fifos */ if (stream == SNDRV_PCM_STREAM_PLAYBACK) base_reg = EP93XX_I2S_TX0EN; else base_reg = EP93XX_I2S_RX0EN; for (i = 0; i < 3; i++) ep93xx_i2s_write_reg(info, base_reg + (i * 4), 0); if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 && (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) { /* Disable i2s */ ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 0); /* Disable clocks */ clk_disable(info->lrclk); clk_disable(info->sclk); clk_disable(info->mclk); } } static int ep93xx_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); struct snd_soc_dai *cpu_dai = rtd->cpu_dai; snd_soc_dai_set_dma_data(cpu_dai, substream, &info->dma_data[substream->stream]); return 0; } static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); ep93xx_i2s_disable(info, substream->stream); } static int ep93xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(cpu_dai); unsigned int clk_cfg, lin_ctrl; clk_cfg = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXCLKCFG); lin_ctrl = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXLINCTRLDATA); switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: clk_cfg |= EP93XX_I2S_CLKCFG_REL; lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST; break; case SND_SOC_DAIFMT_LEFT_J: clk_cfg &= ~EP93XX_I2S_CLKCFG_REL; lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST; break; case SND_SOC_DAIFMT_RIGHT_J: clk_cfg &= ~EP93XX_I2S_CLKCFG_REL; lin_ctrl |= EP93XX_I2S_LINCTRLDATA_R_JUST; break; default: return -EINVAL; } switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBS_CFS: /* CPU is master */ clk_cfg |= EP93XX_I2S_CLKCFG_MASTER; break; case SND_SOC_DAIFMT_CBM_CFM: /* Codec is master */ clk_cfg &= ~EP93XX_I2S_CLKCFG_MASTER; break; default: return -EINVAL; } switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_NB_NF: /* Negative bit clock, lrclk low on left word */ clk_cfg &= ~(EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL); break; case SND_SOC_DAIFMT_NB_IF: /* Negative bit clock, lrclk low on right word */ clk_cfg &= ~EP93XX_I2S_CLKCFG_CKP; clk_cfg |= EP93XX_I2S_CLKCFG_REL; break; case SND_SOC_DAIFMT_IB_NF: /* Positive bit clock, lrclk low on left word */ clk_cfg |= EP93XX_I2S_CLKCFG_CKP; clk_cfg &= ~EP93XX_I2S_CLKCFG_REL; break; case SND_SOC_DAIFMT_IB_IF: /* Positive bit clock, lrclk low on right word */ clk_cfg |= EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL; break; } /* Write new register values */ ep93xx_i2s_write_reg(info, EP93XX_I2S_RXCLKCFG, clk_cfg); ep93xx_i2s_write_reg(info, EP93XX_I2S_TXCLKCFG, clk_cfg); ep93xx_i2s_write_reg(info, EP93XX_I2S_RXLINCTRLDATA, lin_ctrl); ep93xx_i2s_write_reg(info, EP93XX_I2S_TXLINCTRLDATA, lin_ctrl); return 0; } static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); unsigned word_len, div, sdiv, lrdiv; int err; switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: word_len = EP93XX_I2S_WRDLEN_16; break; case SNDRV_PCM_FORMAT_S24_LE: word_len = EP93XX_I2S_WRDLEN_24; break; case SNDRV_PCM_FORMAT_S32_LE: word_len = EP93XX_I2S_WRDLEN_32; break; default: return -EINVAL; } if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ep93xx_i2s_write_reg(info, EP93XX_I2S_TXWRDLEN, word_len); else ep93xx_i2s_write_reg(info, EP93XX_I2S_RXWRDLEN, word_len); /* * EP93xx I2S module can be setup so SCLK / LRCLK value can be * 32, 64, 128. MCLK / SCLK value can be 2 and 4. * We set LRCLK equal to `rate' and minimum SCLK / LRCLK * value is 64, because our sample size is 32 bit * 2 channels. * I2S standard permits us to transmit more bits than * the codec uses. */ div = clk_get_rate(info->mclk) / params_rate(params); sdiv = 4; if (div > (256 + 512) / 2) { lrdiv = 128; } else { lrdiv = 64; if (div < (128 + 256) / 2) sdiv = 2; } err = clk_set_rate(info->sclk, clk_get_rate(info->mclk) / sdiv); if (err) return err; err = clk_set_rate(info->lrclk, clk_get_rate(info->sclk) / lrdiv); if (err) return err; ep93xx_i2s_enable(info, substream->stream); return 0; } static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(cpu_dai); if (dir == SND_SOC_CLOCK_IN || clk_id != 0) return -EINVAL; return clk_set_rate(info->mclk, freq); } #ifdef CONFIG_PM static int ep93xx_i2s_suspend(struct snd_soc_dai *dai) { struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); if (!dai->active) return 0; ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_PLAYBACK); ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_CAPTURE); return 0; } static int ep93xx_i2s_resume(struct snd_soc_dai *dai) { struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); if (!dai->active) return 0; ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_PLAYBACK); ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_CAPTURE); return 0; } #else #define ep93xx_i2s_suspend NULL #define ep93xx_i2s_resume NULL #endif static const struct snd_soc_dai_ops ep93xx_i2s_dai_ops = { .startup = ep93xx_i2s_startup, .shutdown = ep93xx_i2s_shutdown, .hw_params = ep93xx_i2s_hw_params, .set_sysclk = ep93xx_i2s_set_sysclk, .set_fmt = ep93xx_i2s_set_dai_fmt, }; #define EP93XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S32_LE) static struct snd_soc_dai_driver ep93xx_i2s_dai = { .symmetric_rates= 1, .suspend = ep93xx_i2s_suspend, .resume = ep93xx_i2s_resume, .playback = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_8000_192000, .formats = EP93XX_I2S_FORMATS, }, .capture = { .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_8000_192000, .formats = EP93XX_I2S_FORMATS, }, .ops = &ep93xx_i2s_dai_ops, }; static int ep93xx_i2s_probe(struct platform_device *pdev) { struct ep93xx_i2s_info *info; struct resource *res; int err; info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; info->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(info->regs)) return PTR_ERR(info->regs); info->mclk = clk_get(&pdev->dev, "mclk"); if (IS_ERR(info->mclk)) { err = PTR_ERR(info->mclk); goto fail; } info->sclk = clk_get(&pdev->dev, "sclk"); if (IS_ERR(info->sclk)) { err = PTR_ERR(info->sclk); goto fail_put_mclk; } info->lrclk = clk_get(&pdev->dev, "lrclk"); if (IS_ERR(info->lrclk)) { err = PTR_ERR(info->lrclk); goto fail_put_sclk; } dev_set_drvdata(&pdev->dev, info); info->dma_data = ep93xx_i2s_dma_data; err = snd_soc_register_dai(&pdev->dev, &ep93xx_i2s_dai); if (err) goto fail_put_lrclk; return 0; fail_put_lrclk: dev_set_drvdata(&pdev->dev, NULL); clk_put(info->lrclk); fail_put_sclk: clk_put(info->sclk); fail_put_mclk: clk_put(info->mclk); fail: return err; } static int ep93xx_i2s_remove(struct platform_device *pdev) { struct ep93xx_i2s_info *info = dev_get_drvdata(&pdev->dev); snd_soc_unregister_dai(&pdev->dev); dev_set_drvdata(&pdev->dev, NULL); clk_put(info->lrclk); clk_put(info->sclk); clk_put(info->mclk); return 0; } static struct platform_driver ep93xx_i2s_driver = { .probe = ep93xx_i2s_probe, .remove = ep93xx_i2s_remove, .driver = { .name = "ep93xx-i2s", .owner = THIS_MODULE, }, }; module_platform_driver(ep93xx_i2s_driver); MODULE_ALIAS("platform:ep93xx-i2s"); MODULE_AUTHOR("Ryan Mallon"); MODULE_DESCRIPTION("EP93XX I2S driver"); MODULE_LICENSE("GPL");