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		0x16
 19#define MESON_SOCINFO_MAJOR_VER_MESON8		0x19
 20#define MESON_SOCINFO_MAJOR_VER_MESON8B		0x1b
 21
 22#define MESON_MX_ASSIST_HW_REV			0x14c
 23
 24#define MESON_MX_ANALOG_TOP_METAL_REVISION	0x0
 25
 26#define MESON_MX_BOOTROM_MISC_VER		0x4
 27
 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		else
 50			minor_ver = 0xd;
 51
 52		break;
 53
 54	case MESON_SOCINFO_MAJOR_VER_MESON8B:
 55		if (metal_rev == 0x11111111)
 56			minor_ver = 0xa;
 57		else
 58			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		else
 85			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		if (IS_ERR(analog_top_regmap))
130			return PTR_ERR(analog_top_regmap);
131
132		ret = regmap_read(analog_top_regmap,
133				  MESON_MX_ANALOG_TOP_METAL_REVISION,
134				  &metal_rev);
135		if (ret)
136			return ret;
137	}
138
139	ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
140	if (ret < 0)
141		return ret;
142
143	ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
144			  &misc_ver);
145	if (ret < 0)
146		return ret;
147
148	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
149	if (!soc_dev_attr)
150		return -ENODEV;
151
152	soc_dev_attr->family = "Amlogic Meson";
153
154	np = of_find_node_by_path("/");
155	of_property_read_string(np, "model", &soc_dev_attr->machine);
156	of_node_put(np);
157
158	soc_dev_attr->revision = meson_mx_socinfo_revision(major_ver, misc_ver,
159							   metal_rev);
160	soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
161
162	soc_dev = soc_device_register(soc_dev_attr);
163	if (IS_ERR(soc_dev)) {
164		kfree_const(soc_dev_attr->revision);
165		kfree_const(soc_dev_attr->soc_id);
166		kfree(soc_dev_attr);
167		return PTR_ERR(soc_dev);
168	}
169
170	dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
171		 soc_dev_attr->soc_id, soc_dev_attr->revision);
172
173	return 0;
174}
175device_initcall(meson_mx_socinfo_init);