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