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1/*2 * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>3 *4 * SPDX-License-Identifier: GPL-2.0+5 */6 7#include <linux/io.h>8#include <linux/of.h>9#include <linux/of_address.h>10#include <linux/of_platform.h>11#include <linux/platform_device.h>12#include <linux/slab.h>13#include <linux/sys_soc.h>14#include <linux/bitfield.h>15#include <linux/regmap.h>16#include <linux/mfd/syscon.h>17 18#define MESON_SOCINFO_MAJOR_VER_MESON6		0x1619#define MESON_SOCINFO_MAJOR_VER_MESON8		0x1920#define MESON_SOCINFO_MAJOR_VER_MESON8B		0x1b21 22#define MESON_MX_ASSIST_HW_REV			0x14c23 24#define MESON_MX_ANALOG_TOP_METAL_REVISION	0x025 26#define MESON_MX_BOOTROM_MISC_VER		0x427 28static const char *meson_mx_socinfo_revision(unsigned int major_ver,29					     unsigned int misc_ver,30					     unsigned int metal_rev)31{32	unsigned int minor_ver;33 34	switch (major_ver) {35	case MESON_SOCINFO_MAJOR_VER_MESON6:36		minor_ver = 0xa;37		break;38 39	case MESON_SOCINFO_MAJOR_VER_MESON8:40		if (metal_rev == 0x11111112)41			major_ver = 0x1d;42 43		if (metal_rev == 0x11111111 || metal_rev == 0x11111112)44			minor_ver = 0xa;45		else if (metal_rev == 0x11111113)46			minor_ver = 0xb;47		else if (metal_rev == 0x11111133)48			minor_ver = 0xc;49		else50			minor_ver = 0xd;51 52		break;53 54	case MESON_SOCINFO_MAJOR_VER_MESON8B:55		if (metal_rev == 0x11111111)56			minor_ver = 0xa;57		else58			minor_ver = 0xb;59 60		break;61 62	default:63		minor_ver = 0x0;64		break;65	}66 67	return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,68			 misc_ver);69}70 71static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,72					   unsigned int metal_rev)73{74	const char *soc_id;75 76	switch (major_ver) {77	case MESON_SOCINFO_MAJOR_VER_MESON6:78		soc_id = "Meson6 (AML8726-MX)";79		break;80 81	case MESON_SOCINFO_MAJOR_VER_MESON8:82		if (metal_rev == 0x11111112)83			soc_id = "Meson8m2 (S812)";84		else85			soc_id = "Meson8 (S802)";86 87		break;88 89	case MESON_SOCINFO_MAJOR_VER_MESON8B:90		soc_id = "Meson8b (S805)";91		break;92 93	default:94		soc_id = "Unknown";95		break;96	}97 98	return kstrdup_const(soc_id, GFP_KERNEL);99}100 101static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {102	{ .compatible = "amlogic,meson8-analog-top", },103	{ .compatible = "amlogic,meson8b-analog-top", },104	{ /* sentinel */ }105};106 107static int __init meson_mx_socinfo_init(void)108{109	struct soc_device_attribute *soc_dev_attr;110	struct soc_device *soc_dev;111	struct device_node *np;112	struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;113	unsigned int major_ver, misc_ver, metal_rev = 0;114	int ret;115 116	assist_regmap =117		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");118	if (IS_ERR(assist_regmap))119		return PTR_ERR(assist_regmap);120 121	bootrom_regmap =122		syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");123	if (IS_ERR(bootrom_regmap))124		return PTR_ERR(bootrom_regmap);125 126	np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);127	if (np) {128		analog_top_regmap = syscon_node_to_regmap(np);129		of_node_put(np);130		if (IS_ERR(analog_top_regmap))131			return PTR_ERR(analog_top_regmap);132 133		ret = regmap_read(analog_top_regmap,134				  MESON_MX_ANALOG_TOP_METAL_REVISION,135				  &metal_rev);136		if (ret)137			return ret;138	}139 140	ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);141	if (ret < 0)142		return ret;143 144	ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,145			  &misc_ver);146	if (ret < 0)147		return ret;148 149	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);150	if (!soc_dev_attr)151		return -ENODEV;152 153	soc_dev_attr->family = "Amlogic Meson";154 155	np = of_find_node_by_path("/");156	of_property_read_string(np, "model", &soc_dev_attr->machine);157	of_node_put(np);158 159	soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,160							   metal_rev);161	soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);162 163	soc_dev = soc_device_register(soc_dev_attr);164	if (IS_ERR(soc_dev)) {165		kfree_const(soc_dev_attr->revision);166		kfree_const(soc_dev_attr->soc_id);167		kfree(soc_dev_attr);168		return PTR_ERR(soc_dev);169	}170 171	dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",172		 soc_dev_attr->soc_id, soc_dev_attr->revision);173 174	return 0;175}176device_initcall(meson_mx_socinfo_init);177