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365 lines
8.8 KiB
365 lines
8.8 KiB
/* |
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* ALSA SoC SPDIF Out Audio Layer for spear processors |
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* |
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* Copyright (C) 2012 ST Microelectronics |
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* Vipin Kumar <[email protected]> |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/ioport.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <sound/dmaengine_pcm.h> |
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#include <sound/soc.h> |
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#include <sound/spear_dma.h> |
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#include <sound/spear_spdif.h> |
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#include "spdif_out_regs.h" |
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#include "spear_pcm.h" |
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struct spdif_out_params { |
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u32 rate; |
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u32 core_freq; |
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u32 mute; |
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}; |
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struct spdif_out_dev { |
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struct clk *clk; |
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struct spear_dma_data dma_params; |
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struct spdif_out_params saved_params; |
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u32 running; |
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void __iomem *io_base; |
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struct snd_dmaengine_dai_dma_data dma_params_tx; |
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struct snd_dmaengine_pcm_config config; |
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}; |
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static void spdif_out_configure(struct spdif_out_dev *host) |
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{ |
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writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST); |
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mdelay(1); |
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writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET, |
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host->io_base + SPDIF_OUT_SOFT_RST); |
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writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 | |
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SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW | |
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SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW, |
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host->io_base + SPDIF_OUT_CFG); |
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writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR); |
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writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR); |
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} |
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static int spdif_out_startup(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *cpu_dai) |
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{ |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); |
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int ret; |
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if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
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return -EINVAL; |
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ret = clk_enable(host->clk); |
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if (ret) |
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return ret; |
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host->running = true; |
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spdif_out_configure(host); |
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return 0; |
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} |
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static void spdif_out_shutdown(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
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if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
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return; |
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clk_disable(host->clk); |
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host->running = false; |
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} |
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static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq, |
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u32 rate) |
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{ |
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u32 divider, ctrl; |
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clk_set_rate(host->clk, core_freq); |
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divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128)); |
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ctrl = readl(host->io_base + SPDIF_OUT_CTRL); |
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ctrl &= ~SPDIF_DIVIDER_MASK; |
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ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK; |
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writel(ctrl, host->io_base + SPDIF_OUT_CTRL); |
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} |
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static int spdif_out_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 *dai) |
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{ |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
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u32 rate, core_freq; |
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if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
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return -EINVAL; |
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rate = params_rate(params); |
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switch (rate) { |
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case 8000: |
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case 16000: |
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case 32000: |
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case 64000: |
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/* |
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* The clock is multiplied by 10 to bring it to feasible range |
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* of frequencies for sscg |
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*/ |
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core_freq = 64000 * 128 * 10; /* 81.92 MHz */ |
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break; |
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case 5512: |
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case 11025: |
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case 22050: |
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case 44100: |
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case 88200: |
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case 176400: |
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core_freq = 176400 * 128; /* 22.5792 MHz */ |
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break; |
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case 48000: |
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case 96000: |
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case 192000: |
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default: |
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core_freq = 192000 * 128; /* 24.576 MHz */ |
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break; |
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} |
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spdif_out_clock(host, core_freq, rate); |
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host->saved_params.core_freq = core_freq; |
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host->saved_params.rate = rate; |
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return 0; |
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} |
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static int spdif_out_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 spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
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u32 ctrl; |
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int ret = 0; |
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if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) |
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return -EINVAL; |
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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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ctrl = readl(host->io_base + SPDIF_OUT_CTRL); |
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ctrl &= ~SPDIF_OPMODE_MASK; |
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if (!host->saved_params.mute) |
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ctrl |= SPDIF_OPMODE_AUD_DATA | |
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SPDIF_STATE_NORMAL; |
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else |
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ctrl |= SPDIF_OPMODE_MUTE_PCM; |
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writel(ctrl, host->io_base + SPDIF_OUT_CTRL); |
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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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ctrl = readl(host->io_base + SPDIF_OUT_CTRL); |
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ctrl &= ~SPDIF_OPMODE_MASK; |
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ctrl |= SPDIF_OPMODE_OFF; |
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writel(ctrl, host->io_base + SPDIF_OUT_CTRL); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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return ret; |
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} |
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static int spdif_mute(struct snd_soc_dai *dai, int mute, int direction) |
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{ |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
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u32 val; |
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host->saved_params.mute = mute; |
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val = readl(host->io_base + SPDIF_OUT_CTRL); |
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val &= ~SPDIF_OPMODE_MASK; |
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if (mute) |
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val |= SPDIF_OPMODE_MUTE_PCM; |
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else { |
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if (host->running) |
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val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL; |
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else |
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val |= SPDIF_OPMODE_OFF; |
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} |
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writel(val, host->io_base + SPDIF_OUT_CTRL); |
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return 0; |
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} |
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static int spdif_mute_get(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_value *ucontrol) |
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{ |
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struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); |
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ucontrol->value.integer.value[0] = host->saved_params.mute; |
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return 0; |
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} |
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static int spdif_mute_put(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_value *ucontrol) |
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{ |
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struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai); |
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if (host->saved_params.mute == ucontrol->value.integer.value[0]) |
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return 0; |
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spdif_mute(cpu_dai, ucontrol->value.integer.value[0], |
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SNDRV_PCM_STREAM_PLAYBACK); |
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return 1; |
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} |
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static const struct snd_kcontrol_new spdif_out_controls[] = { |
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SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0, |
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spdif_mute_get, spdif_mute_put), |
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}; |
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static int spdif_soc_dai_probe(struct snd_soc_dai *dai) |
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{ |
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struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai); |
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host->dma_params_tx.filter_data = &host->dma_params; |
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dai->playback_dma_data = &host->dma_params_tx; |
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return snd_soc_add_dai_controls(dai, spdif_out_controls, |
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ARRAY_SIZE(spdif_out_controls)); |
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} |
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static const struct snd_soc_dai_ops spdif_out_dai_ops = { |
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.mute_stream = spdif_mute, |
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.startup = spdif_out_startup, |
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.shutdown = spdif_out_shutdown, |
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.trigger = spdif_out_trigger, |
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.hw_params = spdif_out_hw_params, |
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.no_capture_mute = 1, |
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}; |
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static struct snd_soc_dai_driver spdif_out_dai = { |
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.playback = { |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ |
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SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ |
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SNDRV_PCM_RATE_192000), |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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}, |
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.probe = spdif_soc_dai_probe, |
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.ops = &spdif_out_dai_ops, |
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}; |
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static const struct snd_soc_component_driver spdif_out_component = { |
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.name = "spdif-out", |
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}; |
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static int spdif_out_probe(struct platform_device *pdev) |
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{ |
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struct spdif_out_dev *host; |
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struct spear_spdif_platform_data *pdata; |
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struct resource *res; |
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int ret; |
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host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); |
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if (!host) |
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return -ENOMEM; |
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host->io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
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if (IS_ERR(host->io_base)) |
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return PTR_ERR(host->io_base); |
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host->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(host->clk)) |
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return PTR_ERR(host->clk); |
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pdata = dev_get_platdata(&pdev->dev); |
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host->dma_params.data = pdata->dma_params; |
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host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA; |
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host->dma_params.max_burst = 16; |
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host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
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dev_set_drvdata(&pdev->dev, host); |
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ret = devm_snd_soc_register_component(&pdev->dev, &spdif_out_component, |
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&spdif_out_dai, 1); |
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if (ret) |
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return ret; |
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return devm_spear_pcm_platform_register(&pdev->dev, &host->config, |
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pdata->filter); |
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} |
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#ifdef CONFIG_PM |
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static int spdif_out_suspend(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); |
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if (host->running) |
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clk_disable(host->clk); |
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return 0; |
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} |
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static int spdif_out_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev); |
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if (host->running) { |
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clk_enable(host->clk); |
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spdif_out_configure(host); |
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spdif_out_clock(host, host->saved_params.core_freq, |
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host->saved_params.rate); |
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} |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \ |
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spdif_out_resume); |
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#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops) |
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#else |
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#define SPDIF_OUT_DEV_PM_OPS NULL |
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#endif |
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static struct platform_driver spdif_out_driver = { |
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.probe = spdif_out_probe, |
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.driver = { |
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.name = "spdif-out", |
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.pm = SPDIF_OUT_DEV_PM_OPS, |
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}, |
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}; |
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module_platform_driver(spdif_out_driver); |
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MODULE_AUTHOR("Vipin Kumar <[email protected]>"); |
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MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:spdif_out");
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