ASoC: tegra: add tegra30-i2s driver

This provides an ASoC DAI interface for Tegra 30's I2S controller.

Includes a squashed bugfix from Sumit Bhattacharya <sumitb@nvidia.com>

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 536 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c
new file mode 100644
index 000000000000..8596032985dc
--- /dev/null
+++ b/sound/soc/tegra/tegra30_i2s.c
@@ -0,0 +1,536 @@
+/*
+ * tegra30_i2s.c - Tegra30 I2S driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Based on code copyright/by:
+ *
+ * Copyright (c) 2009-2010, NVIDIA Corporation.
+ * Scott Peterson <speterson@nvidia.com>
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Iliyan Malchev <malchev@google.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "tegra30_ahub.h"
+#include "tegra30_i2s.h"
+
+#define DRV_NAME "tegra30-i2s"
+
+static inline void tegra30_i2s_write(struct tegra30_i2s *i2s, u32 reg, u32 val)
+{
+        regmap_write(i2s->regmap, reg, val);
+}
+
+static inline u32 tegra30_i2s_read(struct tegra30_i2s *i2s, u32 reg)
+{
+        u32 val;
+        regmap_read(i2s->regmap, reg, &val);
+        return val;
+}
+
+static int tegra30_i2s_runtime_suspend(struct device *dev)
+{
+        struct tegra30_i2s *i2s = dev_get_drvdata(dev);
+
+        regcache_cache_only(i2s->regmap, true);
+
+        clk_disable(i2s->clk_i2s);
+
+        return 0;
+}
+
+static int tegra30_i2s_runtime_resume(struct device *dev)
+{
+        struct tegra30_i2s *i2s = dev_get_drvdata(dev);
+        int ret;
+
+        ret = clk_enable(i2s->clk_i2s);
+        if (ret) {
+                dev_err(dev, "clk_enable failed: %d\n", ret);
+                return ret;
+        }
+
+        regcache_cache_only(i2s->regmap, false);
+
+        return 0;
+}
+
+int tegra30_i2s_startup(struct snd_pcm_substream *substream,
+                        struct snd_soc_dai *dai)
+{
+        struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+        int ret;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                ret = tegra30_ahub_allocate_tx_fifo(&i2s->playback_fifo_cif,
+                                        &i2s->playback_dma_data.addr,
+                                        &i2s->playback_dma_data.req_sel);
+                i2s->playback_dma_data.wrap = 4;
+                i2s->playback_dma_data.width = 32;
+                tegra30_ahub_set_rx_cif_source(i2s->playback_i2s_cif,
+                                               i2s->playback_fifo_cif);
+        } else {
+                ret = tegra30_ahub_allocate_rx_fifo(&i2s->capture_fifo_cif,
+                                        &i2s->capture_dma_data.addr,
+                                        &i2s->capture_dma_data.req_sel);
+                i2s->capture_dma_data.wrap = 4;
+                i2s->capture_dma_data.width = 32;
+                tegra30_ahub_set_rx_cif_source(i2s->capture_fifo_cif,
+                                               i2s->capture_i2s_cif);
+        }
+
+        return ret;
+}
+
+void tegra30_i2s_shutdown(struct snd_pcm_substream *substream,
+                        struct snd_soc_dai *dai)
+{
+        struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif);
+                tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif);
+        } else {
+                tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif);
+                tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif);
+        }
+}
+
+static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
+                                unsigned int fmt)
+{
+        struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+        case SND_SOC_DAIFMT_NB_NF:
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        i2s->reg_ctrl &= ~TEGRA30_I2S_CTRL_MASTER_ENABLE;
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBS_CFS:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
+                break;
+        case SND_SOC_DAIFMT_CBM_CFM:
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        i2s->reg_ctrl &= ~(TEGRA30_I2S_CTRL_FRAME_FORMAT_MASK |
+                           TEGRA30_I2S_CTRL_LRCK_MASK);
+        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+        case SND_SOC_DAIFMT_DSP_A:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
+                break;
+        case SND_SOC_DAIFMT_DSP_B:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_LRCK_R_LOW;
+                break;
+        case SND_SOC_DAIFMT_I2S:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
+                break;
+        case SND_SOC_DAIFMT_RIGHT_J:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
+                break;
+        case SND_SOC_DAIFMT_LEFT_J:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int tegra30_i2s_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 tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+        u32 val;
+        int ret, sample_size, srate, i2sclock, bitcnt;
+
+        if (params_channels(params) != 2)
+                return -EINVAL;
+
+        i2s->reg_ctrl &= ~TEGRA30_I2S_CTRL_BIT_SIZE_MASK;
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                i2s->reg_ctrl |= TEGRA30_I2S_CTRL_BIT_SIZE_16;
+                sample_size = 16;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        srate = params_rate(params);
+
+        /* Final "* 2" required by Tegra hardware */
+        i2sclock = srate * params_channels(params) * sample_size * 2;
+
+        bitcnt = (i2sclock / (2 * srate)) - 1;
+        if (bitcnt < 0 || bitcnt > TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
+                return -EINVAL;
+
+        ret = clk_set_rate(i2s->clk_i2s, i2sclock);
+        if (ret) {
+                dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
+                return ret;
+        }
+
+        val = bitcnt << TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
+
+        if (i2sclock % (2 * srate))
+                val |= TEGRA30_I2S_TIMING_NON_SYM_ENABLE;
+
+        tegra30_i2s_write(i2s, TEGRA30_I2S_TIMING, val);
+
+        val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) |
+              (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) |
+              (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) |
+              TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 |
+              TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                val |= TEGRA30_AUDIOCIF_CTRL_DIRECTION_RX;
+                tegra30_i2s_write(i2s, TEGRA30_I2S_CIF_RX_CTRL, val);
+        } else {
+                val |= TEGRA30_AUDIOCIF_CTRL_DIRECTION_TX;
+                tegra30_i2s_write(i2s, TEGRA30_I2S_CIF_TX_CTRL, val);
+        }
+
+        val = (1 << TEGRA30_I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
+              (1 << TEGRA30_I2S_OFFSET_TX_DATA_OFFSET_SHIFT);
+        tegra30_i2s_write(i2s, TEGRA30_I2S_OFFSET, val);
+
+        return 0;
+}
+
+static void tegra30_i2s_start_playback(struct tegra30_i2s *i2s)
+{
+        tegra30_ahub_enable_tx_fifo(i2s->playback_fifo_cif);
+        i2s->reg_ctrl |= TEGRA30_I2S_CTRL_XFER_EN_TX;
+        tegra30_i2s_write(i2s, TEGRA30_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static void tegra30_i2s_stop_playback(struct tegra30_i2s *i2s)
+{
+        tegra30_ahub_disable_tx_fifo(i2s->playback_fifo_cif);
+        i2s->reg_ctrl &= ~TEGRA30_I2S_CTRL_XFER_EN_TX;
+        tegra30_i2s_write(i2s, TEGRA30_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static void tegra30_i2s_start_capture(struct tegra30_i2s *i2s)
+{
+        tegra30_ahub_enable_rx_fifo(i2s->capture_fifo_cif);
+        i2s->reg_ctrl |= TEGRA30_I2S_CTRL_XFER_EN_RX;
+        tegra30_i2s_write(i2s, TEGRA30_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static void tegra30_i2s_stop_capture(struct tegra30_i2s *i2s)
+{
+        tegra30_ahub_disable_rx_fifo(i2s->capture_fifo_cif);
+        i2s->reg_ctrl &= ~TEGRA30_I2S_CTRL_XFER_EN_RX;
+        tegra30_i2s_write(i2s, TEGRA30_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+                                struct snd_soc_dai *dai)
+{
+        struct tegra30_i2s *i2s = 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 (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                        tegra30_i2s_start_playback(i2s);
+                else
+                        tegra30_i2s_start_capture(i2s);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                        tegra30_i2s_stop_playback(i2s);
+                else
+                        tegra30_i2s_stop_capture(i2s);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int tegra30_i2s_probe(struct snd_soc_dai *dai)
+{
+        struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+        dai->capture_dma_data = &i2s->capture_dma_data;
+        dai->playback_dma_data = &i2s->playback_dma_data;
+
+        return 0;
+}
+
+static struct snd_soc_dai_ops tegra30_i2s_dai_ops = {
+        .startup        = tegra30_i2s_startup,
+        .shutdown       = tegra30_i2s_shutdown,
+        .set_fmt        = tegra30_i2s_set_fmt,
+        .hw_params      = tegra30_i2s_hw_params,
+        .trigger        = tegra30_i2s_trigger,
+};
+
+static const struct snd_soc_dai_driver tegra30_i2s_dai_template = {
+        .probe = tegra30_i2s_probe,
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .capture = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .ops = &tegra30_i2s_dai_ops,
+        .symmetric_rates = 1,
+};
+
+static bool tegra30_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TEGRA30_I2S_CTRL:
+        case TEGRA30_I2S_TIMING:
+        case TEGRA30_I2S_OFFSET:
+        case TEGRA30_I2S_CH_CTRL:
+        case TEGRA30_I2S_SLOT_CTRL:
+        case TEGRA30_I2S_CIF_RX_CTRL:
+        case TEGRA30_I2S_CIF_TX_CTRL:
+        case TEGRA30_I2S_FLOWCTL:
+        case TEGRA30_I2S_TX_STEP:
+        case TEGRA30_I2S_FLOW_STATUS:
+        case TEGRA30_I2S_FLOW_TOTAL:
+        case TEGRA30_I2S_FLOW_OVER:
+        case TEGRA30_I2S_FLOW_UNDER:
+        case TEGRA30_I2S_LCOEF_1_4_0:
+        case TEGRA30_I2S_LCOEF_1_4_1:
+        case TEGRA30_I2S_LCOEF_1_4_2:
+        case TEGRA30_I2S_LCOEF_1_4_3:
+        case TEGRA30_I2S_LCOEF_1_4_4:
+        case TEGRA30_I2S_LCOEF_1_4_5:
+        case TEGRA30_I2S_LCOEF_2_4_0:
+        case TEGRA30_I2S_LCOEF_2_4_1:
+        case TEGRA30_I2S_LCOEF_2_4_2:
+                return true;
+        default:
+                return false;
+        };
+}
+
+static bool tegra30_i2s_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case TEGRA30_I2S_FLOW_STATUS:
+        case TEGRA30_I2S_FLOW_TOTAL:
+        case TEGRA30_I2S_FLOW_OVER:
+        case TEGRA30_I2S_FLOW_UNDER:
+                return true;
+        default:
+                return false;
+        };
+}
+
+static const struct regmap_config tegra30_i2s_regmap_config = {
+        .reg_bits = 32,
+        .reg_stride = 4,
+        .val_bits = 32,
+        .max_register = TEGRA30_I2S_LCOEF_2_4_2,
+        .writeable_reg = tegra30_i2s_wr_rd_reg,
+        .readable_reg = tegra30_i2s_wr_rd_reg,
+        .volatile_reg = tegra30_i2s_volatile_reg,
+        .cache_type = REGCACHE_RBTREE,
+};
+
+static __devinit int tegra30_i2s_platform_probe(struct platform_device *pdev)
+{
+        struct tegra30_i2s *i2s;
+        u32 cif_ids[2];
+        struct resource *mem, *memregion;
+        void __iomem *regs;
+        int ret;
+
+        i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_i2s), GFP_KERNEL);
+        if (!i2s) {
+                dev_err(&pdev->dev, "Can't allocate tegra30_i2s\n");
+                ret = -ENOMEM;
+                goto err;
+        }
+        dev_set_drvdata(&pdev->dev, i2s);
+
+        i2s->dai = tegra30_i2s_dai_template;
+        i2s->dai.name = dev_name(&pdev->dev);
+
+        ret = of_property_read_u32_array(pdev->dev.of_node,
+                                         "nvidia,ahub-cif-ids", cif_ids,
+                                         ARRAY_SIZE(cif_ids));
+        if (ret < 0)
+                goto err;
+
+        i2s->playback_i2s_cif = cif_ids[0];
+        i2s->capture_i2s_cif = cif_ids[1];
+
+        i2s->clk_i2s = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(i2s->clk_i2s)) {
+                dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
+                ret = PTR_ERR(i2s->clk_i2s);
+                goto err;
+        }
+
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem) {
+                dev_err(&pdev->dev, "No memory resource\n");
+                ret = -ENODEV;
+                goto err_clk_put;
+        }
+
+        memregion = devm_request_mem_region(&pdev->dev, mem->start,
+                                            resource_size(mem), DRV_NAME);
+        if (!memregion) {
+                dev_err(&pdev->dev, "Memory region already claimed\n");
+                ret = -EBUSY;
+                goto err_clk_put;
+        }
+
+        regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+        if (!regs) {
+                dev_err(&pdev->dev, "ioremap failed\n");
+                ret = -ENOMEM;
+                goto err_clk_put;
+        }
+
+        i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+                                            &tegra30_i2s_regmap_config);
+        if (IS_ERR(i2s->regmap)) {
+                dev_err(&pdev->dev, "regmap init failed\n");
+                ret = PTR_ERR(i2s->regmap);
+                goto err_clk_put;
+        }
+        regcache_cache_only(i2s->regmap, true);
+
+        pm_runtime_enable(&pdev->dev);
+        if (!pm_runtime_enabled(&pdev->dev)) {
+                ret = tegra30_i2s_runtime_resume(&pdev->dev);
+                if (ret)
+                        goto err_pm_disable;
+        }
+
+        ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
+        if (ret) {
+                dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
+                ret = -ENOMEM;
+                goto err_suspend;
+        }
+
+        ret = tegra_pcm_platform_register(&pdev->dev);
+        if (ret) {
+                dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
+                goto err_unregister_dai;
+        }
+
+        return 0;
+
+err_unregister_dai:
+        snd_soc_unregister_dai(&pdev->dev);
+err_suspend:
+        if (!pm_runtime_status_suspended(&pdev->dev))
+                tegra30_i2s_runtime_suspend(&pdev->dev);
+err_pm_disable:
+        pm_runtime_disable(&pdev->dev);
+err_clk_put:
+        clk_put(i2s->clk_i2s);
+err:
+        return ret;
+}
+
+static int __devexit tegra30_i2s_platform_remove(struct platform_device *pdev)
+{
+        struct tegra30_i2s *i2s = dev_get_drvdata(&pdev->dev);
+
+        pm_runtime_disable(&pdev->dev);
+        if (!pm_runtime_status_suspended(&pdev->dev))
+                tegra30_i2s_runtime_suspend(&pdev->dev);
+
+        tegra_pcm_platform_unregister(&pdev->dev);
+        snd_soc_unregister_dai(&pdev->dev);
+
+        clk_put(i2s->clk_i2s);
+
+        return 0;
+}
+
+static const struct of_device_id tegra30_i2s_of_match[] __devinitconst = {
+        { .compatible = "nvidia,tegra30-i2s", },
+        {},
+};
+
+static const struct dev_pm_ops tegra30_i2s_pm_ops __devinitconst = {
+        SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend,
+                           tegra30_i2s_runtime_resume, NULL)
+};
+
+static struct platform_driver tegra30_i2s_driver = {
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+                .of_match_table = tegra30_i2s_of_match,
+                .pm = &tegra30_i2s_pm_ops,
+        },
+        .probe = tegra30_i2s_platform_probe,
+        .remove = __devexit_p(tegra30_i2s_platform_remove),
+};
+module_platform_driver(tegra30_i2s_driver);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra30 I2S ASoC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, tegra30_i2s_of_match);