Subject: RE: [RFC 02/11] soc: Add Realtek chip info driver for RTD1195 and RTD1295

From: James Tai <[email-masked]>
Date: Thu, 2 Jan 2020 14:29:24 +0000

Add Stanley Chang for review.

> Add a soc bus driver to print chip model and revision details.
> 
> Revisions from downstream drivers/soc/realtek/rtd{119x,129x}/rtk_chip.c.
> 
> Signed-off-by: Andreas Färber <[email-masked]>
> ---
>  Naming: What to call the family vs. soc_id?
> 
>  drivers/soc/Kconfig          |   1 +
>  drivers/soc/Makefile         |   1 +
>  drivers/soc/realtek/Kconfig  |  13 ++++
>  drivers/soc/realtek/Makefile |   2 +
>  drivers/soc/realtek/chip.c   | 164
> +++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 181 insertions(+)
>  create mode 100644 drivers/soc/realtek/Kconfig  create mode 100644
> drivers/soc/realtek/Makefile  create mode 100644 drivers/soc/realtek/chip.c
> 
> diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index
> 833e04a7835c..06ae9d97321c 100644
> --- a/drivers/soc/Kconfig
> +++ b/drivers/soc/Kconfig
> @@ -11,6 +11,7 @@ source "drivers/soc/imx/Kconfig"
>  source "drivers/soc/ixp4xx/Kconfig"
>  source "drivers/soc/mediatek/Kconfig"
>  source "drivers/soc/qcom/Kconfig"
> +source "drivers/soc/realtek/Kconfig"
>  source "drivers/soc/renesas/Kconfig"
>  source "drivers/soc/rockchip/Kconfig"
>  source "drivers/soc/samsung/Kconfig"
> diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index
> 2ec355003524..1d55d838a342 100644
> --- a/drivers/soc/Makefile
> +++ b/drivers/soc/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_SOC_XWAY)		+= lantiq/
>  obj-y				+= mediatek/
>  obj-y				+= amlogic/
>  obj-y				+= qcom/
> +obj-y				+= realtek/
>  obj-y				+= renesas/
>  obj-$(CONFIG_ARCH_ROCKCHIP)	+= rockchip/
>  obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
> diff --git a/drivers/soc/realtek/Kconfig b/drivers/soc/realtek/Kconfig new file
> mode 100644 index 000000000000..be75c1889c61
> --- /dev/null
> +++ b/drivers/soc/realtek/Kconfig
> @@ -0,0 +1,13 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later if ARCH_REALTEK ||
> +COMPILE_TEST
> +
> +config REALTEK_SOC
> +	tristate "Realtek chip info"
> +	default ARCH_REALTEK
> +	select SOC_BUS
> +	help
> +	  Say 'y' here to enable support for SoC info on Realtek RTD1195 and
> +	  RTD1295 SoC families.
> +	  If unsure, say 'n'.
> +
> +endif
> diff --git a/drivers/soc/realtek/Makefile b/drivers/soc/realtek/Makefile new
> file mode 100644 index 000000000000..49900273905b
> --- /dev/null
> +++ b/drivers/soc/realtek/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +obj-$(CONFIG_REALTEK_SOC) += chip.o
> diff --git a/drivers/soc/realtek/chip.c b/drivers/soc/realtek/chip.c new file
> mode 100644 index 000000000000..9d13422e9936
> --- /dev/null
> +++ b/drivers/soc/realtek/chip.c
> @@ -0,0 +1,164 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Realtek System-on-Chip info
> + *
> + * Copyright (c) 2017-2019 Andreas Färber  */
> +
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/sys_soc.h>
> +
> +#define REG_CHIP_ID	0x0
> +#define REG_CHIP_REV	0x4
> +
> +struct rtd_soc_revision {
> +	const char *name;
> +	u32 chip_rev;
> +};
> +
> +static const struct rtd_soc_revision rtd1195_revisions[] = {
> +	{ "A", 0x00000000 },
> +	{ "B", 0x00010000 },
> +	{ "C", 0x00020000 },
> +	{ "D", 0x00030000 },
> +	{ }
> +};
> +
> +static const struct rtd_soc_revision rtd1295_revisions[] = {
> +	{ "A00", 0x00000000 },
> +	{ "A01", 0x00010000 },
> +	{ "B00", 0x00020000 },
> +	{ "B01", 0x00030000 },
> +	{ }
> +};
> +
> +struct rtd_soc {
> +	u32 chip_id;
> +	const char *family;
> +	const char *(*get_name)(struct device *dev, const struct rtd_soc *s);
> +	const struct rtd_soc_revision *revisions;
> +	const char *codename;
> +};
> +
> +static const char *default_name(struct device *dev, const struct
> +rtd_soc *s) {
> +	return s->family;
> +}
> +
> +static const struct rtd_soc rtd_soc_families[] = {
> +	{ 0x00006329, "RTD1195", default_name, rtd1195_revisions, "Phoenix" },
> +	{ 0x00006421, "RTD1295", default_name, rtd1295_revisions, "Kylin" },
> +};
> +
> +static const struct rtd_soc *rtd_soc_by_chip_id(u32 chip_id) {
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(rtd_soc_families); i++) {
> +		const struct rtd_soc *family = &rtd_soc_families[i];
> +
> +		if (family->chip_id == chip_id)
> +			return family;
> +	}
> +	return NULL;
> +}
> +
> +static const char *rtd_soc_rev(const struct rtd_soc *family, u32
> +chip_rev) {
> +	if (family) {
> +		const struct rtd_soc_revision *rev = family->revisions;
> +
> +		while (rev && rev->name) {
> +			if (rev->chip_rev == chip_rev)
> +				return rev->name;
> +			rev++;
> +		}
> +	}
> +	return "unknown";
> +}
> +
> +static int rtd_soc_probe(struct platform_device *pdev) {
> +	const struct rtd_soc *s;
> +	struct soc_device_attribute *soc_dev_attr;
> +	struct soc_device *soc_dev;
> +	struct device_node *node;
> +	void __iomem *base;
> +	u32 chip_id, chip_rev;
> +
> +	base = of_iomap(pdev->dev.of_node, 0);
> +	if (!base)
> +		return -ENODEV;
> +
> +	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
> +	if (!soc_dev_attr)
> +		return -ENOMEM;
> +
> +	chip_id  = readl_relaxed(base + REG_CHIP_ID);
> +	chip_rev = readl_relaxed(base + REG_CHIP_REV);
> +
> +	node = of_find_node_by_path("/");
> +	of_property_read_string(node, "model", &soc_dev_attr->machine);
> +	of_node_put(node);
> +
> +	s = rtd_soc_by_chip_id(chip_id);
> +
> +	soc_dev_attr->family = kasprintf(GFP_KERNEL, "Realtek %s",
> +		(s && s->codename) ? s->codename :
> +		((s && s->family) ? s->family : "Digital Home Center"));
> +
> +	if (likely(s && s->get_name))
> +		soc_dev_attr->soc_id = s->get_name(&pdev->dev, s);
> +	else
> +		soc_dev_attr->soc_id = "unknown";
> +
> +	soc_dev_attr->revision = rtd_soc_rev(s, chip_rev);
> +
> +	soc_dev = soc_device_register(soc_dev_attr);
> +	if (IS_ERR(soc_dev)) {
> +		kfree(soc_dev_attr->family);
> +		kfree(soc_dev_attr);
> +		return PTR_ERR(soc_dev);
> +	}
> +
> +	platform_set_drvdata(pdev, soc_dev);
> +
> +	dev_info(soc_device_to_device(soc_dev),
> +		"%s %s (0x%08x) rev %s (0x%08x) detected\n",
> +		soc_dev_attr->family, soc_dev_attr->soc_id, chip_id,
> +		soc_dev_attr->revision, chip_rev);
> +
> +	return 0;
> +}
> +
> +static int rtd_soc_remove(struct platform_device *pdev) {
> +	struct soc_device *soc_dev = platform_get_drvdata(pdev);
> +
> +	soc_device_unregister(soc_dev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id rtd_soc_dt_ids[] = {
> +	 { .compatible = "realtek,rtd1195-chip" },
> +	 { }
> +};
> +
> +static struct platform_driver rtd_soc_driver = {
> +	.probe = rtd_soc_probe,
> +	.remove = rtd_soc_remove,
> +	.driver = {
> +		.name = "rtd1195-soc",
> +		.of_match_table	= rtd_soc_dt_ids,
> +	},
> +};
> +module_platform_driver(rtd_soc_driver);
> +
> +MODULE_DESCRIPTION("Realtek SoC identification");
> +MODULE_LICENSE("GPL");
> --
> 2.16.4
> 
> 
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