soc: Add Amlogic SoC Information driver

menu "SOC (System On Chip) specific Drivers"

source "drivers/soc/actions/Kconfig"

source "drivers/soc/amlogic/Kconfig"

source "drivers/soc/atmel/Kconfig"

source "drivers/soc/bcm/Kconfig"

source "drivers/soc/fsl/Kconfig"

obj-y				+= fsl/

obj-$(CONFIG_ARCH_MXC)		+= imx/

obj-$(CONFIG_ARCH_MEDIATEK)	+= mediatek/

obj-$(CONFIG_ARCH_MESON)	+= amlogic/

obj-$(CONFIG_ARCH_QCOM)		+= qcom/

obj-y				+= renesas/

obj-$(CONFIG_ARCH_ROCKCHIP)	+= rockchip/

menu "Amlogic SoC drivers"

config MESON_GX_SOCINFO

	bool "Amlogic Meson GX SoC Information driver"

	depends on ARCH_MESON || COMPILE_TEST

	default ARCH_MESON

	select SOC_BUS

	help

	  Say yes to support decoding of Amlogic Meson GX SoC family

	  information about the type, package and version.

endmenu

obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o

/*

 * Copyright (c) 2017 BayLibre, SAS

 * Author: Neil Armstrong <narmstrong@baylibre.com>

 *

 * SPDX-License-Identifier: GPL-2.0+

 */

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/sys_soc.h>

#include <linux/bitfield.h>

#include <linux/regmap.h>

#include <linux/mfd/syscon.h>

#define AO_SEC_SD_CFG8		0xe0

#define AO_SEC_SOCINFO_OFFSET	AO_SEC_SD_CFG8

#define SOCINFO_MAJOR	GENMASK(31, 24)

#define SOCINFO_MINOR	GENMASK(23, 16)

#define SOCINFO_PACK	GENMASK(15, 8)

#define SOCINFO_MISC	GENMASK(7, 0)

static const struct meson_gx_soc_id {

	const char *name;

	unsigned int id;

} soc_ids[] = {

	{ "GXBB", 0x1f },

	{ "GXTVBB", 0x20 },

	{ "GXL", 0x21 },

	{ "GXM", 0x22 },

	{ "TXL", 0x23 },

};

static const struct meson_gx_package_id {

	const char *name;

	unsigned int major_id;

	unsigned int pack_id;

} soc_packages[] = {

	{ "S905", 0x1f, 0 },

	{ "S905M", 0x1f, 0x20 },

	{ "S905D", 0x21, 0 },

	{ "S905X", 0x21, 0x80 },

	{ "S905L", 0x21, 0xc0 },

	{ "S905M2", 0x21, 0xe0 },

	{ "S912", 0x22, 0 },

};

static inline unsigned int socinfo_to_major(u32 socinfo)

{

	return FIELD_GET(SOCINFO_MAJOR, socinfo);

}

static inline unsigned int socinfo_to_minor(u32 socinfo)

{

	return FIELD_GET(SOCINFO_MINOR, socinfo);

}

static inline unsigned int socinfo_to_pack(u32 socinfo)

{

	return FIELD_GET(SOCINFO_PACK, socinfo);

}

static inline unsigned int socinfo_to_misc(u32 socinfo)

{

	return FIELD_GET(SOCINFO_MISC, socinfo);

}

static const char *socinfo_to_package_id(u32 socinfo)

{

	unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;

	unsigned int major = socinfo_to_major(socinfo);

	int i;

	for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {

		if (soc_packages[i].major_id == major &&

		    soc_packages[i].pack_id == pack)

			return soc_packages[i].name;

	}

	return "Unknown";

}

static const char *socinfo_to_soc_id(u32 socinfo)

{

	unsigned int id = socinfo_to_major(socinfo);

	int i;

	for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {

		if (soc_ids[i].id == id)

			return soc_ids[i].name;

	}

	return "Unknown";

}

int __init meson_gx_socinfo_init(void)

{

	struct soc_device_attribute *soc_dev_attr;

	struct soc_device *soc_dev;

	struct device_node *np;

	struct regmap *regmap;

	unsigned int socinfo;

	struct device *dev;

	int ret;

	/* look up for chipid node */

	np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");

	if (!np)

		return -ENODEV;

	/* check if interface is enabled */

	if (!of_device_is_available(np))

		return -ENODEV;

	/* check if chip-id is available */

	if (!of_property_read_bool(np, "amlogic,has-chip-id"))

		return -ENODEV;

	/* node should be a syscon */

	regmap = syscon_node_to_regmap(np);

	of_node_put(np);

	if (IS_ERR(regmap)) {

		pr_err("%s: failed to get regmap\n", __func__);

		return -ENODEV;

	}

	ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);

	if (ret < 0)

		return ret;

	if (!socinfo) {

		pr_err("%s: invalid chipid value\n", __func__);

		return -EINVAL;

	}

	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);

	if (!soc_dev_attr)

		return -ENODEV;

	soc_dev_attr->family = "Amlogic Meson";

	np = of_find_node_by_path("/");

	of_property_read_string(np, "model", &soc_dev_attr->machine);

	of_node_put(np);

	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",

					   socinfo_to_major(socinfo),

					   socinfo_to_minor(socinfo),

					   socinfo_to_pack(socinfo),

					   socinfo_to_misc(socinfo));

	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",

					 socinfo_to_soc_id(socinfo),

					 socinfo_to_package_id(socinfo));

	soc_dev = soc_device_register(soc_dev_attr);

	if (IS_ERR(soc_dev)) {

		kfree(soc_dev_attr->revision);

		kfree_const(soc_dev_attr->soc_id);

		kfree(soc_dev_attr);

		return PTR_ERR(soc_dev);

	}

	dev = soc_device_to_device(soc_dev);

	dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",

			soc_dev_attr->soc_id,

			socinfo_to_major(socinfo),

			socinfo_to_minor(socinfo),

			socinfo_to_pack(socinfo),

			socinfo_to_misc(socinfo));

	return 0;

}

device_initcall(meson_gx_socinfo_init);