/*
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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 <vipin.kumar@st.com>
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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host->io_base = devm_ioremap_resource(&pdev->dev, 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 <vipin.kumar@st.com>");
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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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