1/*
  2 * Copyright (c) 2017 BayLibre, SAS
  3 * Author: Neil Armstrong <narmstrong@baylibre.com>
  4 *
  5 * SPDX-License-Identifier: GPL-2.0+
  6 */
  7
  8#include <linux/io.h>
  9#include <linux/of.h>
 10#include <linux/of_address.h>
 11#include <linux/of_platform.h>
 12#include <linux/platform_device.h>
 13#include <linux/slab.h>
 14#include <linux/sys_soc.h>
 15#include <linux/bitfield.h>
 16#include <linux/regmap.h>
 17#include <linux/mfd/syscon.h>
 18
 19#define AO_SEC_SD_CFG8		0xe0
 20#define AO_SEC_SOCINFO_OFFSET	AO_SEC_SD_CFG8
 21
 22#define SOCINFO_MAJOR	GENMASK(31, 24)
 23#define SOCINFO_PACK	GENMASK(23, 16)
 24#define SOCINFO_MINOR	GENMASK(15, 8)
 25#define SOCINFO_MISC	GENMASK(7, 0)
 26
 27static const struct meson_gx_soc_id {
 28	const char *name;
 29	unsigned int id;
 30} soc_ids[] = {
 31	{ "GXBB", 0x1f },
 32	{ "GXTVBB", 0x20 },
 33	{ "GXL", 0x21 },
 34	{ "GXM", 0x22 },
 35	{ "TXL", 0x23 },
 36	{ "TXLX", 0x24 },
 37	{ "AXG", 0x25 },
 38	{ "GXLX", 0x26 },
 39	{ "TXHD", 0x27 },
 40	{ "G12A", 0x28 },
 41	{ "G12B", 0x29 },
 42	{ "SM1", 0x2b },
 43};
 44
 45static const struct meson_gx_package_id {
 46	const char *name;
 47	unsigned int major_id;
 48	unsigned int pack_id;
 49	unsigned int pack_mask;
 50} soc_packages[] = {
 51	{ "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
 52	{ "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
 53	{ "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
 54	{ "S905D", 0x21, 0, 0xf0 },
 55	{ "S905X", 0x21, 0x80, 0xf0 },
 56	{ "S905W", 0x21, 0xa0, 0xf0 },
 57	{ "S905L", 0x21, 0xc0, 0xf0 },
 58	{ "S905M2", 0x21, 0xe0, 0xf0 },
 59	{ "S805X", 0x21, 0x30, 0xf0 },
 60	{ "S805Y", 0x21, 0xb0, 0xf0 },
 61	{ "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
 62	{ "962X", 0x24, 0x10, 0xf0 },
 63	{ "962E", 0x24, 0x20, 0xf0 },
 64	{ "A113X", 0x25, 0x37, 0xff },
 65	{ "A113D", 0x25, 0x22, 0xff },
 66	{ "S905D2", 0x28, 0x10, 0xf0 },
 67	{ "S905X2", 0x28, 0x40, 0xf0 },
 68	{ "S922X", 0x29, 0x40, 0xf0 },
 69	{ "A311D", 0x29, 0x10, 0xf0 },
 70	{ "S905X3", 0x2b, 0x5, 0xf },
 71};
 72
 73static inline unsigned int socinfo_to_major(u32 socinfo)
 74{
 75	return FIELD_GET(SOCINFO_MAJOR, socinfo);
 76}
 77
 78static inline unsigned int socinfo_to_minor(u32 socinfo)
 79{
 80	return FIELD_GET(SOCINFO_MINOR, socinfo);
 81}
 82
 83static inline unsigned int socinfo_to_pack(u32 socinfo)
 84{
 85	return FIELD_GET(SOCINFO_PACK, socinfo);
 86}
 87
 88static inline unsigned int socinfo_to_misc(u32 socinfo)
 89{
 90	return FIELD_GET(SOCINFO_MISC, socinfo);
 91}
 92
 93static const char *socinfo_to_package_id(u32 socinfo)
 94{
 95	unsigned int pack = socinfo_to_pack(socinfo);
 96	unsigned int major = socinfo_to_major(socinfo);
 97	int i;
 98
 99	for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
100		if (soc_packages[i].major_id == major &&
101		    soc_packages[i].pack_id ==
102				(pack & soc_packages[i].pack_mask))
103			return soc_packages[i].name;
104	}
105
106	return "Unknown";
107}
108
109static const char *socinfo_to_soc_id(u32 socinfo)
110{
111	unsigned int id = socinfo_to_major(socinfo);
112	int i;
113
114	for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
115		if (soc_ids[i].id == id)
116			return soc_ids[i].name;
117	}
118
119	return "Unknown";
120}
121
122static int __init meson_gx_socinfo_init(void)
123{
124	struct soc_device_attribute *soc_dev_attr;
125	struct soc_device *soc_dev;
126	struct device_node *np;
127	struct regmap *regmap;
128	unsigned int socinfo;
129	struct device *dev;
130	int ret;
131
132	/* look up for chipid node */
133	np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
134	if (!np)
135		return -ENODEV;
136
137	/* check if interface is enabled */
138	if (!of_device_is_available(np)) {
139		of_node_put(np);
140		return -ENODEV;
141	}
142
143	/* check if chip-id is available */
144	if (!of_property_read_bool(np, "amlogic,has-chip-id")) {
145		of_node_put(np);
146		return -ENODEV;
147	}
148
149	/* node should be a syscon */
150	regmap = syscon_node_to_regmap(np);
151	of_node_put(np);
152	if (IS_ERR(regmap)) {
153		pr_err("%s: failed to get regmap\n", __func__);
154		return -ENODEV;
155	}
156
157	ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
158	if (ret < 0)
159		return ret;
160
161	if (!socinfo) {
162		pr_err("%s: invalid chipid value\n", __func__);
163		return -EINVAL;
164	}
165
166	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
167	if (!soc_dev_attr)
168		return -ENODEV;
169
170	soc_dev_attr->family = "Amlogic Meson";
171
172	np = of_find_node_by_path("/");
173	of_property_read_string(np, "model", &soc_dev_attr->machine);
174	of_node_put(np);
175
176	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
177					   socinfo_to_major(socinfo),
178					   socinfo_to_minor(socinfo),
179					   socinfo_to_pack(socinfo),
180					   socinfo_to_misc(socinfo));
181	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
182					 socinfo_to_soc_id(socinfo),
183					 socinfo_to_package_id(socinfo));
184
185	soc_dev = soc_device_register(soc_dev_attr);
186	if (IS_ERR(soc_dev)) {
187		kfree(soc_dev_attr->revision);
188		kfree_const(soc_dev_attr->soc_id);
189		kfree(soc_dev_attr);
190		return PTR_ERR(soc_dev);
191	}
192	dev = soc_device_to_device(soc_dev);
193
194	dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
195			soc_dev_attr->soc_id,
196			socinfo_to_major(socinfo),
197			socinfo_to_minor(socinfo),
198			socinfo_to_pack(socinfo),
199			socinfo_to_misc(socinfo));
200
201	return 0;
202}
203device_initcall(meson_gx_socinfo_init);