soc: amlogic: Add Meson6/Meson8/Meson8b/Meson8m2 SoC Information driver (5e68c0fc) · Commits · 戴 / test

drivers/soc/amlogic/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -9,4 +9,14 @@ config MESON_GX_SOCINFO
		Say yes to support decoding of Amlogic Meson GX SoC family
		information about the type, package and version.

		config MESON_MX_SOCINFO
		bool "Amlogic Meson MX SoC Information driver"
		depends on ARCH_MESON \|\| COMPILE_TEST
		default ARCH_MESON
		select SOC_BUS
		help
		Say yes to support decoding of Amlogic Meson6, Meson8,
		Meson8b and Meson8m2 SoC family information about the type
		and version.

		endmenu

drivers/soc/amlogic/Makefile

+1 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
		obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o

drivers/soc/amlogic/meson-mx-socinfo.c

0 → 100644

+175 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.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 MESON_SOCINFO_MAJOR_VER_MESON6 0x16
		#define MESON_SOCINFO_MAJOR_VER_MESON8 0x19
		#define MESON_SOCINFO_MAJOR_VER_MESON8B 0x1b

		#define MESON_MX_ASSIST_HW_REV 0x14c

		#define MESON_MX_ANALOG_TOP_METAL_REVISION 0x0

		#define MESON_MX_BOOTROM_MISC_VER 0x4

		static const char *meson_mx_socinfo_revision(unsigned int major_ver,
		unsigned int misc_ver,
		unsigned int metal_rev)
		{
		unsigned int minor_ver;

		switch (major_ver) {
		case MESON_SOCINFO_MAJOR_VER_MESON6:
		minor_ver = 0xa;
		break;

		case MESON_SOCINFO_MAJOR_VER_MESON8:
		if (metal_rev == 0x11111112)
		major_ver = 0x1d;

		if (metal_rev == 0x11111111 \|\| metal_rev == 0x11111112)
		minor_ver = 0xa;
		else if (metal_rev == 0x11111113)
		minor_ver = 0xb;
		else if (metal_rev == 0x11111133)
		minor_ver = 0xc;
		else
		minor_ver = 0xd;

		break;

		case MESON_SOCINFO_MAJOR_VER_MESON8B:
		if (metal_rev == 0x11111111)
		minor_ver = 0xa;
		else
		minor_ver = 0xb;

		break;

		default:
		minor_ver = 0x0;
		break;
		}

		return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
		misc_ver);
		}

		static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
		unsigned int metal_rev)
		{
		const char *soc_id;

		switch (major_ver) {
		case MESON_SOCINFO_MAJOR_VER_MESON6:
		soc_id = "Meson6 (AML8726-MX)";
		break;

		case MESON_SOCINFO_MAJOR_VER_MESON8:
		if (metal_rev == 0x11111112)
		soc_id = "Meson8m2 (S812)";
		else
		soc_id = "Meson8 (S802)";

		break;

		case MESON_SOCINFO_MAJOR_VER_MESON8B:
		soc_id = "Meson8b (S805)";
		break;

		default:
		soc_id = "Unknown";
		break;
		}

		return kstrdup_const(soc_id, GFP_KERNEL);
		}

		static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
		{ .compatible = "amlogic,meson8-analog-top", },
		{ .compatible = "amlogic,meson8b-analog-top", },
		{ /* sentinel */ }
		};

		int __init meson_mx_socinfo_init(void)
		{
		struct soc_device_attribute *soc_dev_attr;
		struct soc_device *soc_dev;
		struct device_node *np;
		struct regmap assist_regmap, bootrom_regmap, *analog_top_regmap;
		unsigned int major_ver, misc_ver, metal_rev = 0;
		int ret;

		assist_regmap =
		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
		if (IS_ERR(assist_regmap))
		return PTR_ERR(assist_regmap);

		bootrom_regmap =
		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
		if (IS_ERR(bootrom_regmap))
		return PTR_ERR(bootrom_regmap);

		np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
		if (np) {
		analog_top_regmap = syscon_node_to_regmap(np);
		if (IS_ERR(analog_top_regmap))
		return PTR_ERR(analog_top_regmap);

		ret = regmap_read(analog_top_regmap,
		MESON_MX_ANALOG_TOP_METAL_REVISION,
		&metal_rev);
		if (ret)
		return ret;
		}

		ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
		if (ret < 0)
		return ret;

		ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
		&misc_ver);
		if (ret < 0)
		return ret;

		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 = meson_mx_socinfo_revision(major_ver, misc_ver,
		metal_rev);
		soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);

		soc_dev = soc_device_register(soc_dev_attr);
		if (IS_ERR(soc_dev)) {
		kfree_const(soc_dev_attr->revision);
		kfree_const(soc_dev_attr->soc_id);
		kfree(soc_dev_attr);
		return PTR_ERR(soc_dev);
		}

		dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
		soc_dev_attr->soc_id, soc_dev_attr->revision);

		return 0;
		}
		device_initcall(meson_mx_socinfo_init);

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