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-rw-r--r--sound/soc/tegra/tegra_spdif.c371
1 files changed, 371 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_spdif.c b/sound/soc/tegra/tegra_spdif.c
new file mode 100644
index 0000000..abe606b
--- /dev/null
+++ b/sound/soc/tegra/tegra_spdif.c
@@ -0,0 +1,371 @@
+/*
+ * tegra_spdif.c - Tegra SPDIF driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2011 - NVIDIA, Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <mach/iomap.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "tegra_spdif.h"
+
+#define DRV_NAME "tegra-spdif"
+
+static inline void tegra_spdif_write(struct tegra_spdif *spdif, u32 reg,
+ u32 val)
+{
+ __raw_writel(val, spdif->regs + reg);
+}
+
+static inline u32 tegra_spdif_read(struct tegra_spdif *spdif, u32 reg)
+{
+ return __raw_readl(spdif->regs + reg);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int tegra_spdif_show(struct seq_file *s, void *unused)
+{
+#define REG(r) { r, #r }
+ static const struct {
+ int offset;
+ const char *name;
+ } regs[] = {
+ REG(TEGRA_SPDIF_CTRL),
+ REG(TEGRA_SPDIF_STATUS),
+ REG(TEGRA_SPDIF_STROBE_CTRL),
+ REG(TEGRA_SPDIF_DATA_FIFO_CSR),
+ REG(TEGRA_SPDIF_CH_STA_RX_A),
+ REG(TEGRA_SPDIF_CH_STA_RX_B),
+ REG(TEGRA_SPDIF_CH_STA_RX_C),
+ REG(TEGRA_SPDIF_CH_STA_RX_D),
+ REG(TEGRA_SPDIF_CH_STA_RX_E),
+ REG(TEGRA_SPDIF_CH_STA_RX_F),
+ REG(TEGRA_SPDIF_CH_STA_TX_A),
+ REG(TEGRA_SPDIF_CH_STA_TX_B),
+ REG(TEGRA_SPDIF_CH_STA_TX_C),
+ REG(TEGRA_SPDIF_CH_STA_TX_D),
+ REG(TEGRA_SPDIF_CH_STA_TX_E),
+ REG(TEGRA_SPDIF_CH_STA_TX_F),
+ };
+#undef REG
+
+ struct tegra_spdif *spdif = s->private;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(regs); i++) {
+ u32 val = tegra_spdif_read(spdif, regs[i].offset);
+ seq_printf(s, "%s = %08x\n", regs[i].name, val);
+ }
+
+ return 0;
+}
+
+static int tegra_spdif_debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, tegra_spdif_show, inode->i_private);
+}
+
+static const struct file_operations tegra_spdif_debug_fops = {
+ .open = tegra_spdif_debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void tegra_spdif_debug_add(struct tegra_spdif *spdif)
+{
+ spdif->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
+ snd_soc_debugfs_root, spdif,
+ &tegra_spdif_debug_fops);
+}
+
+static void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
+{
+ if (spdif->debug)
+ debugfs_remove(spdif->debug);
+}
+#else
+static inline void tegra_spdif_debug_add(struct tegra_spdif *spdif)
+{
+}
+
+static inline void tegra_spdif_debug_remove(struct tegra_spdif *spdif)
+{
+}
+#endif
+
+static int tegra_spdif_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct device *dev = substream->pcm->card->dev;
+ struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+ int ret, srate, spdifclock;
+
+ spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_PACK;
+ spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_BIT_MODE_MASK;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_PACK;
+ spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_BIT_MODE_16BIT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ srate = params_rate(params);
+ switch (params_rate(params)) {
+ case 32000:
+ spdifclock = 4096000;
+ break;
+ case 44100:
+ spdifclock = 5644800;
+ break;
+ case 48000:
+ spdifclock = 6144000;
+ break;
+ case 88200:
+ spdifclock = 11289600;
+ break;
+ case 96000:
+ spdifclock = 12288000;
+ break;
+ case 176400:
+ spdifclock = 22579200;
+ break;
+ case 192000:
+ spdifclock = 24576000;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = clk_set_rate(spdif->clk_spdif_out, spdifclock);
+ if (ret) {
+ dev_err(dev, "Can't set SPDIF clock rate: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void tegra_spdif_start_playback(struct tegra_spdif *spdif)
+{
+ spdif->reg_ctrl |= TEGRA_SPDIF_CTRL_TX_EN;
+ tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
+}
+
+static void tegra_spdif_stop_playback(struct tegra_spdif *spdif)
+{
+ spdif->reg_ctrl &= ~TEGRA_SPDIF_CTRL_TX_EN;
+ tegra_spdif_write(spdif, TEGRA_SPDIF_CTRL, spdif->reg_ctrl);
+}
+
+static int tegra_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ if (!spdif->clk_refs)
+ clk_enable(spdif->clk_spdif_out);
+ spdif->clk_refs++;
+ tegra_spdif_start_playback(spdif);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ tegra_spdif_stop_playback(spdif);
+ spdif->clk_refs--;
+ if (!spdif->clk_refs)
+ clk_disable(spdif->clk_spdif_out);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int tegra_spdif_probe(struct snd_soc_dai *dai)
+{
+ struct tegra_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+
+ dai->capture_dma_data = NULL;
+ dai->playback_dma_data = &spdif->playback_dma_data;
+
+ return 0;
+}
+
+static struct snd_soc_dai_ops tegra_spdif_dai_ops = {
+ .hw_params = tegra_spdif_hw_params,
+ .trigger = tegra_spdif_trigger,
+};
+
+struct snd_soc_dai_driver tegra_spdif_dai = {
+ .name = DRV_NAME,
+ .probe = tegra_spdif_probe,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = &tegra_spdif_dai_ops,
+};
+
+static __devinit int tegra_spdif_platform_probe(struct platform_device *pdev)
+{
+ struct tegra_spdif *spdif;
+ struct resource *mem, *memregion, *dmareq;
+ int ret;
+
+ spdif = kzalloc(sizeof(struct tegra_spdif), GFP_KERNEL);
+ if (!spdif) {
+ dev_err(&pdev->dev, "Can't allocate tegra_spdif\n");
+ ret = -ENOMEM;
+ goto exit;
+ }
+ dev_set_drvdata(&pdev->dev, spdif);
+
+ spdif->clk_spdif_out = clk_get(&pdev->dev, "spdif_out");
+ if (IS_ERR(spdif->clk_spdif_out)) {
+ pr_err("Can't retrieve spdif clock\n");
+ ret = PTR_ERR(spdif->clk_spdif_out);
+ goto err_free;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(&pdev->dev, "No memory resource\n");
+ ret = -ENODEV;
+ goto err_clk_put;
+ }
+
+ dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!dmareq) {
+ dev_err(&pdev->dev, "No DMA resource\n");
+ ret = -ENODEV;
+ goto err_clk_put;
+ }
+
+ memregion = request_mem_region(mem->start, resource_size(mem),
+ DRV_NAME);
+ if (!memregion) {
+ dev_err(&pdev->dev, "Memory region already claimed\n");
+ ret = -EBUSY;
+ goto err_clk_put;
+ }
+
+ spdif->regs = ioremap(mem->start, resource_size(mem));
+ if (!spdif->regs) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ ret = -ENOMEM;
+ goto err_release;
+ }
+
+ spdif->playback_dma_data.addr = mem->start + TEGRA_SPDIF_DATA_OUT;
+ spdif->playback_dma_data.wrap = 4;
+ spdif->playback_dma_data.width = 32;
+ spdif->playback_dma_data.req_sel = dmareq->start;
+
+ ret = snd_soc_register_dai(&pdev->dev, &tegra_spdif_dai);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
+ ret = -ENOMEM;
+ goto err_unmap;
+ }
+
+ tegra_spdif_debug_add(spdif);
+
+ return 0;
+
+err_unmap:
+ iounmap(spdif->regs);
+err_release:
+ release_mem_region(mem->start, resource_size(mem));
+err_clk_put:
+ clk_put(spdif->clk_spdif_out);
+err_free:
+ kfree(spdif);
+exit:
+ return ret;
+}
+
+static int __devexit tegra_spdif_platform_remove(struct platform_device *pdev)
+{
+ struct tegra_spdif *spdif = dev_get_drvdata(&pdev->dev);
+ struct resource *res;
+
+ snd_soc_unregister_dai(&pdev->dev);
+
+ tegra_spdif_debug_remove(spdif);
+
+ iounmap(spdif->regs);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+
+ clk_put(spdif->clk_spdif_out);
+
+ kfree(spdif);
+
+ return 0;
+}
+
+static struct platform_driver tegra_spdif_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = tegra_spdif_platform_probe,
+ .remove = __devexit_p(tegra_spdif_platform_remove),
+};
+
+static int __init snd_tegra_spdif_init(void)
+{
+ return platform_driver_register(&tegra_spdif_driver);
+}
+module_init(snd_tegra_spdif_init);
+
+static void __exit snd_tegra_spdif_exit(void)
+{
+ platform_driver_unregister(&tegra_spdif_driver);
+}
+module_exit(snd_tegra_spdif_exit);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra SPDIF ASoC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
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