From: Daniel Baluta daniel.baluta@nxp.com

On i.MX8 platforms that have a DSP the DAI handling is taken care of by two entities: * Application Processor (AP), which runs Linux * DSP, which runs a firmware (typically Sound Open Firmware)

The DSP has access to DAI IP registers, but it cannot easily handle resources like: * clocks * power domain management * pinctrl

For this reason we introduce a generic FSL DAI driver which will take care of the resources above. --- sound/soc/fsl/Kconfig | 8 ++ sound/soc/fsl/Makefile | 2 + sound/soc/fsl/fsl_dai.c | 276 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 286 insertions(+) create mode 100644 sound/soc/fsl/fsl_dai.c

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig index 65e8cd4be930..bea8ab2c24f9 100644 --- a/sound/soc/fsl/Kconfig +++ b/sound/soc/fsl/Kconfig @@ -75,6 +75,14 @@ config SND_SOC_FSL_ESAI This option is only useful for out-of-tree drivers since in-tree drivers select it automatically.

+config SND_SOC_FSL_DAI + tristate "Generic FSL DAI support for Sound Open Firmware" + help + Say Y if you want to enable generic FSL DAI support to be used + with Sound Open Firmware. This module takes care of enabling + clocks, power domain, pinctrl for FSL DAIs. The rest of DAI + control is taken care of by SOF firmware. + config SND_SOC_FSL_MICFIL tristate "Pulse Density Modulation Microphone Interface (MICFIL) module support" select REGMAP_MMIO diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile index 8cde88c72d93..e4ed253b6657 100644 --- a/sound/soc/fsl/Makefile +++ b/sound/soc/fsl/Makefile @@ -20,6 +20,7 @@ snd-soc-fsl-ssi-y := fsl_ssi.o snd-soc-fsl-ssi-$(CONFIG_DEBUG_FS) += fsl_ssi_dbg.o snd-soc-fsl-spdif-objs := fsl_spdif.o snd-soc-fsl-esai-objs := fsl_esai.o +snd-soc-fsl-dai-objs := fsl_dai.o snd-soc-fsl-micfil-objs := fsl_micfil.o snd-soc-fsl-utils-objs := fsl_utils.o snd-soc-fsl-dma-objs := fsl_dma.o @@ -32,6 +33,7 @@ obj-$(CONFIG_SND_SOC_FSL_SAI) += snd-soc-fsl-sai.o obj-$(CONFIG_SND_SOC_FSL_SSI) += snd-soc-fsl-ssi.o obj-$(CONFIG_SND_SOC_FSL_SPDIF) += snd-soc-fsl-spdif.o obj-$(CONFIG_SND_SOC_FSL_ESAI) += snd-soc-fsl-esai.o +obj-$(CONFIG_SND_SOC_FSL_DAI) += snd-soc-fsl-dai.o obj-$(CONFIG_SND_SOC_FSL_MICFIL) += snd-soc-fsl-micfil.o obj-$(CONFIG_SND_SOC_FSL_UTILS) += snd-soc-fsl-utils.o obj-$(CONFIG_SND_SOC_FSL_MQS) += snd-soc-fsl-mqs.o diff --git a/sound/soc/fsl/fsl_dai.c b/sound/soc/fsl/fsl_dai.c new file mode 100644 index 000000000000..f70889939801 --- /dev/null +++ b/sound/soc/fsl/fsl_dai.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Freescale Generic DAI driver for DSP +// +// Copyright 2019 NXP +// Author: Daniel Baluta daniel.baluta@nxp.com + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/pm_domain.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +enum fsl_dai_type { + FSL_DAI_TYPE_NONE, + FSL_DAI_TYPE_SAI, + FSL_DAI_TYPE_ESAI, +}; + +#define FSL_DAI_ESAI_CLK_NUM 4 +static const char *esai_clks[FSL_DAI_ESAI_CLK_NUM] = { + "core", + "extal", + "fsys", + "spba", +}; + +#define FSL_DAI_SAI_CLK_NUM 5 +static const char *sai_clks[FSL_DAI_SAI_CLK_NUM] = { + "bus", + "mclk0", + "mclk1", + "mclk2", + "mclk3", +}; + +struct fsl_dai { + struct platform_device *pdev; + + /* DAI clocks */ + struct clk **clks; + const char **clk_names; + int num_clks; + + /* Power Domain handling */ + int num_domains; + struct device **pd_dev; + struct device_link **link; + + /* DAIS */ + struct snd_soc_dai_driver *dai_drv; + int num_drv; +}; + +static struct snd_soc_dai_driver fsl_esai_dai = { + .name = "esai0", +}; + +static struct snd_soc_dai_driver fsl_sai_dai = { + .name = "sai1", +}; + +static const struct snd_soc_component_driver fsl_dai_component = { + .name = "fsl-dai", +}; + +static int fsl_dai_init_clocks(struct fsl_dai *dai_priv) +{ + struct device *dev = &dai_priv->pdev->dev; + int i; + + dai_priv->clks = devm_kcalloc(dev, dai_priv->num_clks, + sizeof(*dai_priv->clks), GFP_KERNEL); + if (!dai_priv->clks) + return -ENOMEM; + + for (i = 0; i < dai_priv->num_clks; i++) { + dai_priv->clks[i] = devm_clk_get(dev, dai_priv->clk_names[i]); + if (IS_ERR(dai_priv->clks[i])) { + dev_dbg(dev, "Failed to get clk %s\n", + dai_priv->clk_names[i]); + dai_priv->clks[i] = NULL; + } + } + + return 0; +} + +int fsl_get_dai_type(struct fsl_dai *dai_priv) +{ + struct device_node *np = dai_priv->pdev->dev.of_node; + + if (of_device_is_compatible(np, "fsl,esai-dai")) + return FSL_DAI_TYPE_ESAI; + + if (of_device_is_compatible(np, "fsl,sai-dai")) + return FSL_DAI_TYPE_SAI; + + return FSL_DAI_TYPE_NONE; +} + +static int fsl_dai_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_dai *priv; + int dai_type; + int ret; + int i; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->pdev = pdev; + + dev_set_drvdata(&pdev->dev, priv); + + dai_type = fsl_get_dai_type(priv); + switch (dai_type) { + case FSL_DAI_TYPE_ESAI: + priv->clk_names = esai_clks; + priv->num_clks = FSL_DAI_ESAI_CLK_NUM; + priv->dai_drv = &fsl_esai_dai; + priv->num_drv = 1; + break; + case FSL_DAI_TYPE_SAI: + priv->clk_names = sai_clks; + priv->num_clks = FSL_DAI_SAI_CLK_NUM; + priv->dai_drv = &fsl_sai_dai; + priv->num_drv = 1; + break; + default: + dev_err(&pdev->dev, "Invalid DAI type %d\n", dai_type); + return -EINVAL; + } + + ret = fsl_dai_init_clocks(priv); + if (ret < 0) { + dev_err(&pdev->dev, "Error at init clocks\n"); + return ret; + } + + priv->num_domains = of_count_phandle_with_args(np, "power-domains", + "#power-domain-cells"); + if (priv->num_domains < 0) { + dev_err(&pdev->dev, "no power-domains property in %pOF\n", np); + return priv->num_domains; + } + + priv->pd_dev = devm_kmalloc_array(&pdev->dev, priv->num_domains, + sizeof(*priv->pd_dev), GFP_KERNEL); + if (!priv->pd_dev) + return -ENOMEM; + + priv->link = devm_kmalloc_array(&pdev->dev, priv->num_domains, + sizeof(*priv->link), GFP_KERNEL); + if (!priv->link) + return -ENOMEM; + + for (i = 0; i < priv->num_domains; i++) { + priv->pd_dev[i] = dev_pm_domain_attach_by_id(&pdev->dev, i); + if (IS_ERR(priv->pd_dev[i])) { + ret = PTR_ERR(priv->pd_dev[i]); + goto unroll_pm; + } + + priv->link[i] = device_link_add(&pdev->dev, priv->pd_dev[i], + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + if (!priv->link[i]) { + ret = -EINVAL; + dev_pm_domain_detach(priv->pd_dev[i], false); + goto unroll_pm; + } + } + + pm_runtime_enable(&pdev->dev); + + ret = devm_snd_soc_register_component(&pdev->dev, &fsl_dai_component, + priv->dai_drv, priv->num_drv); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register DAI ret = %d\n", ret); + return ret; + } + return 0; + +unroll_pm: + while (--i >= 0) { + device_link_del(priv->link[i]); + dev_pm_domain_detach(priv->pd_dev[i], false); + } + return ret; +} + +static int fsl_dai_remove(struct platform_device *pdev) +{ + struct fsl_dai *priv = platform_get_drvdata(pdev); + int i; + + pm_runtime_disable(&priv->pdev->dev); + + for (i = 0; i < priv->num_domains; i++) { + device_link_del(priv->link[i]); + dev_pm_domain_detach(priv->pd_dev[i], false); + } + + return 0; +} + +static const struct of_device_id fsl_dai_dt_ids[] = { + { .compatible = "fsl,esai-dai", }, + { .compatible = "fsl,sai-dai", }, + {} +}; +MODULE_DEVICE_TABLE(of, fsl_dai_dt_ids); + +#ifdef CONFIG_PM +static int fsl_dai_runtime_resume(struct device *dev) +{ + struct fsl_dai *priv = dev_get_drvdata(dev); + int i, ret; + + for (i = 0; i < priv->num_clks; i++) { + ret = clk_prepare_enable(priv->clks[i]); + if (ret < 0) { + dev_err(dev, "Failed to enable clk %s\n", + priv->clk_names[i]); + goto out; + } + } + return 0; +out: + while (--i >= 0) + clk_disable_unprepare(priv->clks[i]); + + return ret; +} + +static int fsl_dai_runtime_suspend(struct device *dev) +{ + struct fsl_dai *priv = dev_get_drvdata(dev); + int i; + + for (i = 0; i < priv->num_clks; i++) + clk_disable_unprepare(priv->clks[i]); + + return 0; +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops fsl_dai_pm_ops = { + SET_RUNTIME_PM_OPS(fsl_dai_runtime_suspend, + fsl_dai_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) +}; + +static struct platform_driver fsl_dai_driver = { + .probe = fsl_dai_probe, + .remove = fsl_dai_remove, + .driver = { + .name = "fsl-dai", + .pm = &fsl_dai_pm_ops, + .of_match_table = fsl_dai_dt_ids, + }, +}; + +module_platform_driver(fsl_dai_driver); + +MODULE_ALIAS("platform:fsl-dai"); + +MODULE_AUTHOR("Daniel Baluta daniel.baluta@nxp.com"); +MODULE_DESCRIPTION("FSL Generic DAI driver for DSP"); +MODULE_LICENSE("GPL v2");