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Diffstat (limited to 'sound/soc/tegra/tegra20_i2s.c')
-rw-r--r--sound/soc/tegra/tegra20_i2s.c514
1 files changed, 514 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra20_i2s.c b/sound/soc/tegra/tegra20_i2s.c
new file mode 100644
index 000000000..fff0cd658
--- /dev/null
+++ b/sound/soc/tegra/tegra20_i2s.c
@@ -0,0 +1,514 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tegra20_i2s.c - Tegra20 I2S driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010,2012 - NVIDIA, Inc.
+ *
+ * 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>
+ */
+
+#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/reset.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "tegra20_i2s.h"
+
+#define DRV_NAME "tegra20-i2s"
+
+static __maybe_unused int tegra20_i2s_runtime_suspend(struct device *dev)
+{
+ struct tegra20_i2s *i2s = dev_get_drvdata(dev);
+
+ regcache_cache_only(i2s->regmap, true);
+
+ clk_disable_unprepare(i2s->clk_i2s);
+
+ return 0;
+}
+
+static __maybe_unused int tegra20_i2s_runtime_resume(struct device *dev)
+{
+ struct tegra20_i2s *i2s = dev_get_drvdata(dev);
+ int ret;
+
+ ret = reset_control_assert(i2s->reset);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(i2s->clk_i2s);
+ if (ret) {
+ dev_err(dev, "clk_enable failed: %d\n", ret);
+ return ret;
+ }
+
+ usleep_range(10, 100);
+
+ ret = reset_control_deassert(i2s->reset);
+ if (ret)
+ goto disable_clocks;
+
+ regcache_cache_only(i2s->regmap, false);
+ regcache_mark_dirty(i2s->regmap);
+
+ ret = regcache_sync(i2s->regmap);
+ if (ret)
+ goto disable_clocks;
+
+ return 0;
+
+disable_clocks:
+ clk_disable_unprepare(i2s->clk_i2s);
+
+ return ret;
+}
+
+static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
+ unsigned int fmt)
+{
+ struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int mask = 0, val = 0;
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mask |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
+ switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
+ case SND_SOC_DAIFMT_BP_FP:
+ val |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
+ break;
+ case SND_SOC_DAIFMT_BC_FC:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mask |= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
+ TEGRA20_I2S_CTRL_LRCK_MASK;
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_DSP_A:
+ val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
+ val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
+ break;
+ case SND_SOC_DAIFMT_DSP_B:
+ val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
+ val |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
+ break;
+ case SND_SOC_DAIFMT_I2S:
+ val |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
+ val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ val |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
+ val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ val |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
+ val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
+
+ return 0;
+}
+
+static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct device *dev = dai->dev;
+ struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int mask, val;
+ int ret, sample_size, srate, i2sclock, bitcnt;
+
+ mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
+ sample_size = 16;
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
+ sample_size = 24;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
+ sample_size = 32;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mask |= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
+ val |= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
+
+ regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
+
+ srate = params_rate(params);
+
+ /* Final "* 2" required by Tegra hardware */
+ i2sclock = srate * params_channels(params) * sample_size * 2;
+
+ ret = clk_set_rate(i2s->clk_i2s, i2sclock);
+ if (ret) {
+ dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
+ return ret;
+ }
+
+ bitcnt = (i2sclock / (2 * srate)) - 1;
+ if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
+ return -EINVAL;
+ val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
+
+ if (i2sclock % (2 * srate))
+ val |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
+
+ regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);
+
+ regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
+ TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
+ TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
+
+ return 0;
+}
+
+static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
+{
+ regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
+ TEGRA20_I2S_CTRL_FIFO1_ENABLE,
+ TEGRA20_I2S_CTRL_FIFO1_ENABLE);
+}
+
+static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
+{
+ regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
+ TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
+}
+
+static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
+{
+ regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
+ TEGRA20_I2S_CTRL_FIFO2_ENABLE,
+ TEGRA20_I2S_CTRL_FIFO2_ENABLE);
+}
+
+static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
+{
+ regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
+ TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
+}
+
+static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct tegra20_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)
+ tegra20_i2s_start_playback(i2s);
+ else
+ tegra20_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)
+ tegra20_i2s_stop_playback(i2s);
+ else
+ tegra20_i2s_stop_capture(i2s);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int tegra20_i2s_probe(struct snd_soc_dai *dai)
+{
+ struct tegra20_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 const unsigned int tegra20_i2s_rates[] = {
+ 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000
+};
+
+static int tegra20_i2s_filter_rates(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval *r = hw_param_interval(params, rule->var);
+ struct snd_soc_dai *dai = rule->private;
+ struct tegra20_i2s *i2s = dev_get_drvdata(dai->dev);
+ struct clk *parent = clk_get_parent(i2s->clk_i2s);
+ long i, parent_rate, valid_rates = 0;
+
+ parent_rate = clk_get_rate(parent);
+ if (parent_rate <= 0) {
+ dev_err(dai->dev, "Can't get parent clock rate: %ld\n",
+ parent_rate);
+ return parent_rate ?: -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(tegra20_i2s_rates); i++) {
+ if (parent_rate % (tegra20_i2s_rates[i] * 128) == 0)
+ valid_rates |= BIT(i);
+ }
+
+ /*
+ * At least one rate must be valid, otherwise the parent clock isn't
+ * audio PLL. Nothing should be filtered in this case.
+ */
+ if (!valid_rates)
+ valid_rates = BIT(ARRAY_SIZE(tegra20_i2s_rates)) - 1;
+
+ return snd_interval_list(r, ARRAY_SIZE(tegra20_i2s_rates),
+ tegra20_i2s_rates, valid_rates);
+}
+
+static int tegra20_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ if (!device_property_read_bool(dai->dev, "nvidia,fixed-parent-rate"))
+ return 0;
+
+ return snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ tegra20_i2s_filter_rates, dai,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+}
+
+static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
+ .set_fmt = tegra20_i2s_set_fmt,
+ .hw_params = tegra20_i2s_hw_params,
+ .trigger = tegra20_i2s_trigger,
+ .startup = tegra20_i2s_startup,
+};
+
+static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
+ .probe = tegra20_i2s_probe,
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = &tegra20_i2s_dai_ops,
+ .symmetric_rate = 1,
+};
+
+static const struct snd_soc_component_driver tegra20_i2s_component = {
+ .name = DRV_NAME,
+ .legacy_dai_naming = 1,
+};
+
+static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA20_I2S_CTRL:
+ case TEGRA20_I2S_STATUS:
+ case TEGRA20_I2S_TIMING:
+ case TEGRA20_I2S_FIFO_SCR:
+ case TEGRA20_I2S_PCM_CTRL:
+ case TEGRA20_I2S_NW_CTRL:
+ case TEGRA20_I2S_TDM_CTRL:
+ case TEGRA20_I2S_TDM_TX_RX_CTRL:
+ case TEGRA20_I2S_FIFO1:
+ case TEGRA20_I2S_FIFO2:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA20_I2S_STATUS:
+ case TEGRA20_I2S_FIFO_SCR:
+ case TEGRA20_I2S_FIFO1:
+ case TEGRA20_I2S_FIFO2:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA20_I2S_FIFO1:
+ case TEGRA20_I2S_FIFO2:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config tegra20_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = TEGRA20_I2S_FIFO2,
+ .writeable_reg = tegra20_i2s_wr_rd_reg,
+ .readable_reg = tegra20_i2s_wr_rd_reg,
+ .volatile_reg = tegra20_i2s_volatile_reg,
+ .precious_reg = tegra20_i2s_precious_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int tegra20_i2s_platform_probe(struct platform_device *pdev)
+{
+ struct tegra20_i2s *i2s;
+ struct resource *mem;
+ void __iomem *regs;
+ int ret;
+
+ i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
+ if (!i2s) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ dev_set_drvdata(&pdev->dev, i2s);
+
+ i2s->dai = tegra20_i2s_dai_template;
+ i2s->dai.name = dev_name(&pdev->dev);
+
+ i2s->reset = devm_reset_control_get_exclusive(&pdev->dev, "i2s");
+ if (IS_ERR(i2s->reset)) {
+ dev_err(&pdev->dev, "Can't retrieve i2s reset\n");
+ return PTR_ERR(i2s->reset);
+ }
+
+ i2s->clk_i2s = devm_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;
+ }
+
+ regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
+ if (IS_ERR(regs)) {
+ ret = PTR_ERR(regs);
+ goto err;
+ }
+
+ i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &tegra20_i2s_regmap_config);
+ if (IS_ERR(i2s->regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ ret = PTR_ERR(i2s->regmap);
+ goto err;
+ }
+
+ i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
+ i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ i2s->capture_dma_data.maxburst = 4;
+
+ i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
+ i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ i2s->playback_dma_data.maxburst = 4;
+
+ pm_runtime_enable(&pdev->dev);
+
+ ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
+ &i2s->dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
+ ret = -ENOMEM;
+ goto err_pm_disable;
+ }
+
+ ret = tegra_pcm_platform_register(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
+ goto err_unregister_component;
+ }
+
+ return 0;
+
+err_unregister_component:
+ snd_soc_unregister_component(&pdev->dev);
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+err:
+ return ret;
+}
+
+static int tegra20_i2s_platform_remove(struct platform_device *pdev)
+{
+ tegra_pcm_platform_unregister(&pdev->dev);
+ snd_soc_unregister_component(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id tegra20_i2s_of_match[] = {
+ { .compatible = "nvidia,tegra20-i2s", },
+ {},
+};
+
+static const struct dev_pm_ops tegra20_i2s_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
+ tegra20_i2s_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
+static struct platform_driver tegra20_i2s_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = tegra20_i2s_of_match,
+ .pm = &tegra20_i2s_pm_ops,
+ },
+ .probe = tegra20_i2s_platform_probe,
+ .remove = tegra20_i2s_platform_remove,
+};
+module_platform_driver(tegra20_i2s_driver);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);