[PATCH v2 1/2] Port SoC framework from Linux
Sascha Hauer
sha at pengutronix.de
Wed Jan 24 00:27:21 PST 2024
Hi Marco,
Looks good to me. Can you rebase on current master?
Sascha
On Tue, Jan 16, 2024 at 06:10:25PM +0100, Marco Felsch wrote:
> This adds the initial support for the Linux soc framework which can be
> used to register all SoC relevant informations. The framework can be
> used by driver to check for errata for an specific soc(-revision) in the
> future since this require porting the matching function.
>
> For now it gathers all required SoC information and provide a standard
> interface to query the data via device params.
>
> Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
> ---
> Changelog:
> v2:
> - nothing
>
> drivers/base/Kconfig | 3 +
> drivers/base/Makefile | 1 +
> drivers/base/soc.c | 123 ++++++++++++++++++++++++++++++++++++++++
> include/linux/sys_soc.h | 39 +++++++++++++
> 4 files changed, 166 insertions(+)
> create mode 100644 drivers/base/soc.c
> create mode 100644 include/linux/sys_soc.h
>
> diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> index 612a84be33e7..21a4793cfa47 100644
> --- a/drivers/base/Kconfig
> +++ b/drivers/base/Kconfig
> @@ -6,4 +6,7 @@ config PM_GENERIC_DOMAINS
> config FEATURE_CONTROLLER
> bool "Feature controller support" if COMPILE_TEST || SANDBOX
>
> +config SOC_BUS
> + bool
> +
> source "drivers/base/regmap/Kconfig"
> diff --git a/drivers/base/Makefile b/drivers/base/Makefile
> index e8e354cdaabc..acc53763da35 100644
> --- a/drivers/base/Makefile
> +++ b/drivers/base/Makefile
> @@ -7,3 +7,4 @@ obj-y += regmap/
>
> obj-$(CONFIG_PM_GENERIC_DOMAINS) += power.o
> obj-$(CONFIG_FEATURE_CONTROLLER) += featctrl.o
> +obj-$(CONFIG_SOC_BUS) += soc.o
> diff --git a/drivers/base/soc.c b/drivers/base/soc.c
> new file mode 100644
> index 000000000000..a481f8987b56
> --- /dev/null
> +++ b/drivers/base/soc.c
> @@ -0,0 +1,123 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +// SPDX-FileCopyrightText: 2024 Marco Felsch, Pengutronix
> +/*
> + * Based on Linux drivers/base/soc.c:
> + * Copyright (C) ST-Ericsson SA 2011
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <of.h>
> +
> +#include <linux/slab.h>
> +#include <linux/sys_soc.h>
> +#include <linux/err.h>
> +
> +struct soc_device {
> + struct device dev;
> + struct soc_device_attribute *attr;
> +};
> +
> +static struct bus_type soc_bus_type = {
> + .name = "soc",
> +};
> +static bool soc_bus_registered;
> +
> +static void soc_device_add_params(struct soc_device *soc_dev)
> +{
> + struct soc_device_attribute *attr = soc_dev->attr;
> + struct device *dev = &soc_dev->dev;
> +
> + if (attr->machine)
> + dev_add_param_string_fixed(dev, "machine", attr->machine);
> + if (attr->family)
> + dev_add_param_string_fixed(dev, "family", attr->family);
> + if (attr->revision)
> + dev_add_param_string_fixed(dev, "revision", attr->revision);
> + if (attr->serial_number)
> + dev_add_param_string_fixed(dev, "serial_number", attr->serial_number);
> + if (attr->soc_id)
> + dev_add_param_string_fixed(dev, "soc_id", attr->soc_id);
> +}
> +
> +static void soc_device_get_machine(struct soc_device_attribute *soc_dev_attr)
> +{
> + struct device_node *np;
> +
> + if (soc_dev_attr->machine)
> + return;
> +
> + np = of_find_node_by_path("/");
> + of_property_read_string(np, "model", &soc_dev_attr->machine);
> + of_node_put(np);
> +}
> +
> +static struct soc_device_attribute *early_soc_dev_attr;
> +
> +struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
> +{
> + struct soc_device *soc_dev;
> + int ret;
> +
> + soc_device_get_machine(soc_dev_attr);
> +
> + if (!soc_bus_registered) {
> + if (early_soc_dev_attr)
> + return ERR_PTR(-EBUSY);
> + early_soc_dev_attr = soc_dev_attr;
> + return NULL;
> + }
> +
> + soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
> + if (!soc_dev) {
> + ret = -ENOMEM;
> + goto out1;
> + }
> +
> + soc_dev->attr = soc_dev_attr;
> + soc_dev->dev.bus = &soc_bus_type;
> + soc_dev->dev.id = DEVICE_ID_DYNAMIC;
> +
> + dev_set_name(&soc_dev->dev, "soc");
> +
> + ret = device_register(&soc_dev->dev);
> + if (ret) {
> + put_device(&soc_dev->dev);
> + goto out2;
> + }
> +
> + soc_device_add_params(soc_dev);
> +
> + return soc_dev;
> +
> +out2:
> + kfree(soc_dev);
> +out1:
> + return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL_GPL(soc_device_register);
> +
> +/* Ensure soc_dev->attr is freed after calling soc_device_unregister. */
> +void soc_device_unregister(struct soc_device *soc_dev)
> +{
> + device_unregister(&soc_dev->dev);
> + kfree(soc_dev);
> + early_soc_dev_attr = NULL;
> +}
> +EXPORT_SYMBOL_GPL(soc_device_unregister);
> +
> +static int __init soc_bus_register(void)
> +{
> + int ret;
> +
> + ret = bus_register(&soc_bus_type);
> + if (ret)
> + return ret;
> + soc_bus_registered = true;
> +
> + if (early_soc_dev_attr)
> + return PTR_ERR(soc_device_register(early_soc_dev_attr));
> +
> + return 0;
> +}
> +core_initcall(soc_bus_register);
> diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h
> new file mode 100644
> index 000000000000..fd597ae54096
> --- /dev/null
> +++ b/include/linux/sys_soc.h
> @@ -0,0 +1,39 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) ST-Ericsson SA 2011
> + * Author: Lee Jones <lee.jones at linaro.org> for ST-Ericsson.
> + */
> +#ifndef __SOC_BUS_H
> +#define __SOC_BUS_H
> +
> +#include <linux/device.h>
> +
> +struct soc_device_attribute {
> + const char *machine;
> + const char *family;
> + const char *revision;
> + const char *serial_number;
> + const char *soc_id;
> + const void *data;
> +};
> +
> +/**
> + * soc_device_register - register SoC as a device
> + * @soc_plat_dev_attr: Attributes passed from platform to be attributed to a SoC
> + */
> +struct soc_device *soc_device_register(
> + struct soc_device_attribute *soc_plat_dev_attr);
> +
> +/**
> + * soc_device_unregister - unregister SoC device
> + * @dev: SoC device to be unregistered
> + */
> +void soc_device_unregister(struct soc_device *soc_dev);
> +
> +/**
> + * soc_device_to_device - helper function to fetch struct device
> + * @soc: Previously registered SoC device container
> + */
> +struct device *soc_device_to_device(struct soc_device *soc);
> +
> +#endif /* __SOC_BUS_H */
> --
> 2.39.2
>
>
>
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
More information about the barebox
mailing list