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Diffstat (limited to 'sound/soc/fsl/fsl_rpmsg.c')
-rw-r--r--sound/soc/fsl/fsl_rpmsg.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_rpmsg.c b/sound/soc/fsl/fsl_rpmsg.c
new file mode 100644
index 000000000000..ea5c973e2e84
--- /dev/null
+++ b/sound/soc/fsl/fsl_rpmsg.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2018-2021 NXP
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/pm_runtime.h>
+#include <linux/rpmsg.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+
+#include "fsl_rpmsg.h"
+#include "imx-pcm.h"
+
+#define FSL_RPMSG_RATES (SNDRV_PCM_RATE_8000 | \
+ SNDRV_PCM_RATE_16000 | \
+ SNDRV_PCM_RATE_48000)
+#define FSL_RPMSG_FORMATS SNDRV_PCM_FMTBIT_S16_LE
+
+/* 192kHz/32bit/2ch/60s size is 0x574e00 */
+#define LPA_LARGE_BUFFER_SIZE (0x6000000)
+
+static const unsigned int fsl_rpmsg_rates[] = {
+ 8000, 11025, 16000, 22050, 44100,
+ 32000, 48000, 96000, 88200, 176400, 192000,
+ 352800, 384000, 705600, 768000, 1411200, 2822400,
+};
+
+static const struct snd_pcm_hw_constraint_list fsl_rpmsg_rate_constraints = {
+ .count = ARRAY_SIZE(fsl_rpmsg_rates),
+ .list = fsl_rpmsg_rates,
+};
+
+static int fsl_rpmsg_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
+ struct clk *p = rpmsg->mclk, *pll = NULL, *npll = NULL;
+ u64 rate = params_rate(params);
+ int ret = 0;
+
+ /* Get current pll parent */
+ while (p && rpmsg->pll8k && rpmsg->pll11k) {
+ struct clk *pp = clk_get_parent(p);
+
+ if (clk_is_match(pp, rpmsg->pll8k) ||
+ clk_is_match(pp, rpmsg->pll11k)) {
+ pll = pp;
+ break;
+ }
+ p = pp;
+ }
+
+ /* Switch to another pll parent if needed. */
+ if (pll) {
+ npll = (do_div(rate, 8000) ? rpmsg->pll11k : rpmsg->pll8k);
+ if (!clk_is_match(pll, npll)) {
+ ret = clk_set_parent(p, npll);
+ if (ret < 0)
+ dev_warn(dai->dev, "failed to set parent %s: %d\n",
+ __clk_get_name(npll), ret);
+ }
+ }
+
+ if (!(rpmsg->mclk_streams & BIT(substream->stream))) {
+ ret = clk_prepare_enable(rpmsg->mclk);
+ if (ret) {
+ dev_err(dai->dev, "failed to enable mclk: %d\n", ret);
+ return ret;
+ }
+
+ rpmsg->mclk_streams |= BIT(substream->stream);
+ }
+
+ return ret;
+}
+
+static int fsl_rpmsg_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
+
+ if (rpmsg->mclk_streams & BIT(substream->stream)) {
+ clk_disable_unprepare(rpmsg->mclk);
+ rpmsg->mclk_streams &= ~BIT(substream->stream);
+ }
+
+ return 0;
+}
+
+static int fsl_rpmsg_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ int ret;
+
+ ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ &fsl_rpmsg_rate_constraints);
+
+ return ret;
+}
+
+static const struct snd_soc_dai_ops fsl_rpmsg_dai_ops = {
+ .startup = fsl_rpmsg_startup,
+ .hw_params = fsl_rpmsg_hw_params,
+ .hw_free = fsl_rpmsg_hw_free,
+};
+
+static struct snd_soc_dai_driver fsl_rpmsg_dai = {
+ .playback = {
+ .stream_name = "CPU-Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = FSL_RPMSG_FORMATS,
+ },
+ .capture = {
+ .stream_name = "CPU-Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = FSL_RPMSG_FORMATS,
+ },
+ .symmetric_rate = 1,
+ .symmetric_channels = 1,
+ .symmetric_sample_bits = 1,
+ .ops = &fsl_rpmsg_dai_ops,
+};
+
+static const struct snd_soc_component_driver fsl_component = {
+ .name = "fsl-rpmsg",
+};
+
+static const struct of_device_id fsl_rpmsg_ids[] = {
+ { .compatible = "fsl,imx7ulp-rpmsg-audio"},
+ { .compatible = "fsl,imx8mm-rpmsg-audio"},
+ { .compatible = "fsl,imx8mn-rpmsg-audio"},
+ { .compatible = "fsl,imx8mp-rpmsg-audio"},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_rpmsg_ids);
+
+static int fsl_rpmsg_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct fsl_rpmsg *rpmsg;
+ int ret;
+
+ rpmsg = devm_kzalloc(&pdev->dev, sizeof(struct fsl_rpmsg), GFP_KERNEL);
+ if (!rpmsg)
+ return -ENOMEM;
+
+ if (of_property_read_bool(np, "fsl,enable-lpa")) {
+ rpmsg->enable_lpa = 1;
+ rpmsg->buffer_size = LPA_LARGE_BUFFER_SIZE;
+ } else {
+ rpmsg->buffer_size = IMX_DEFAULT_DMABUF_SIZE;
+ }
+
+ /* Get the optional clocks */
+ rpmsg->ipg = devm_clk_get(&pdev->dev, "ipg");
+ if (IS_ERR(rpmsg->ipg))
+ rpmsg->ipg = NULL;
+
+ rpmsg->mclk = devm_clk_get(&pdev->dev, "mclk");
+ if (IS_ERR(rpmsg->mclk))
+ rpmsg->mclk = NULL;
+
+ rpmsg->dma = devm_clk_get(&pdev->dev, "dma");
+ if (IS_ERR(rpmsg->dma))
+ rpmsg->dma = NULL;
+
+ rpmsg->pll8k = devm_clk_get(&pdev->dev, "pll8k");
+ if (IS_ERR(rpmsg->pll8k))
+ rpmsg->pll8k = NULL;
+
+ rpmsg->pll11k = devm_clk_get(&pdev->dev, "pll11k");
+ if (IS_ERR(rpmsg->pll11k))
+ rpmsg->pll11k = NULL;
+
+ platform_set_drvdata(pdev, rpmsg);
+ pm_runtime_enable(&pdev->dev);
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
+ &fsl_rpmsg_dai, 1);
+ if (ret)
+ return ret;
+
+ rpmsg->card_pdev = platform_device_register_data(&pdev->dev,
+ "imx-audio-rpmsg",
+ PLATFORM_DEVID_NONE,
+ NULL,
+ 0);
+ if (IS_ERR(rpmsg->card_pdev)) {
+ dev_err(&pdev->dev, "failed to register rpmsg card\n");
+ ret = PTR_ERR(rpmsg->card_pdev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int fsl_rpmsg_remove(struct platform_device *pdev)
+{
+ struct fsl_rpmsg *rpmsg = platform_get_drvdata(pdev);
+
+ if (rpmsg->card_pdev)
+ platform_device_unregister(rpmsg->card_pdev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int fsl_rpmsg_runtime_resume(struct device *dev)
+{
+ struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(rpmsg->ipg);
+ if (ret) {
+ dev_err(dev, "failed to enable ipg clock: %d\n", ret);
+ goto ipg_err;
+ }
+
+ ret = clk_prepare_enable(rpmsg->dma);
+ if (ret) {
+ dev_err(dev, "Failed to enable dma clock %d\n", ret);
+ goto dma_err;
+ }
+
+ return 0;
+
+dma_err:
+ clk_disable_unprepare(rpmsg->ipg);
+ipg_err:
+ return ret;
+}
+
+static int fsl_rpmsg_runtime_suspend(struct device *dev)
+{
+ struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(rpmsg->dma);
+ clk_disable_unprepare(rpmsg->ipg);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops fsl_rpmsg_pm_ops = {
+ SET_RUNTIME_PM_OPS(fsl_rpmsg_runtime_suspend,
+ fsl_rpmsg_runtime_resume,
+ NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
+static struct platform_driver fsl_rpmsg_driver = {
+ .probe = fsl_rpmsg_probe,
+ .remove = fsl_rpmsg_remove,
+ .driver = {
+ .name = "fsl_rpmsg",
+ .pm = &fsl_rpmsg_pm_ops,
+ .of_match_table = fsl_rpmsg_ids,
+ },
+};
+module_platform_driver(fsl_rpmsg_driver);
+
+MODULE_DESCRIPTION("Freescale SoC Audio PRMSG CPU Interface");
+MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
+MODULE_ALIAS("platform:fsl_rpmsg");
+MODULE_LICENSE("GPL");