meson-gx-socinfo.c

  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	{ "A1", 0x2c },
 44	{ "T7", 0x36 },
 45	{ "S4", 0x37 },
 46	{ "A5", 0x3c },
 47	{ "C3", 0x3d },
 48	{ "A4", 0x40 },
 49	{ "S7", 0x46 },
 50	{ "S7D", 0x47 },
 51	{ "S6", 0x48 },
 52};
 53
 54static const struct meson_gx_package_id {
 55	const char *name;
 56	unsigned int major_id;
 57	unsigned int pack_id;
 58	unsigned int pack_mask;
 59} soc_packages[] = {
 60	{ "S905", 0x1f, 0, 0x20 }, /* pack_id != 0x20 */
 61	{ "S905H", 0x1f, 0x3, 0xf }, /* pack_id & 0xf == 0x3 */
 62	{ "S905M", 0x1f, 0x20, 0xf0 }, /* pack_id == 0x20 */
 63	{ "S905D", 0x21, 0, 0xf0 },
 64	{ "S905X", 0x21, 0x80, 0xf0 },
 65	{ "S905W", 0x21, 0xa0, 0xf0 },
 66	{ "S905L", 0x21, 0xc0, 0xf0 },
 67	{ "S905M2", 0x21, 0xe0, 0xf0 },
 68	{ "S805X", 0x21, 0x30, 0xf0 },
 69	{ "S805Y", 0x21, 0xb0, 0xf0 },
 70	{ "S912", 0x22, 0, 0x0 }, /* Only S912 is known for GXM */
 71	{ "962X", 0x24, 0x10, 0xf0 },
 72	{ "962E", 0x24, 0x20, 0xf0 },
 73	{ "A113X", 0x25, 0x37, 0xff },
 74	{ "A113X", 0x25, 0x43, 0xff },
 75	{ "A113D", 0x25, 0x22, 0xff },
 76	{ "S905L", 0x26, 0, 0x0 },
 77	{ "S905D2", 0x28, 0x10, 0xf0 },
 78	{ "S905Y2", 0x28, 0x30, 0xf0 },
 79	{ "S905X2", 0x28, 0x40, 0xf0 },
 80	{ "A311D", 0x29, 0x10, 0xf0 },
 81	{ "S922X", 0x29, 0x40, 0xf0 },
 82	{ "S905D3", 0x2b, 0x4, 0xf5 },
 83	{ "S905X3", 0x2b, 0x5, 0xf5 },
 84	{ "S905X3", 0x2b, 0x10, 0x3f },
 85	{ "S905D3", 0x2b, 0x30, 0x3f },
 86	{ "A113L", 0x2c, 0x0, 0xf8 },
 87	{ "S805X2", 0x37, 0x2, 0xf },
 88	{ "C308L", 0x3d, 0x1, 0xf },
 89	{ "A311D2", 0x36, 0x1, 0xf },
 90	{ "A113X2", 0x3c, 0x1, 0xf },
 91	{ "A113L2", 0x40, 0x1, 0xf },
 92	{ "S805X3", 0x46, 0x3, 0xf },
 93	{ "S905X5M", 0x47, 0x1, 0xf },
 94	{ "S905X5", 0x48, 0x1, 0xf },
 95};
 96
 97static inline unsigned int socinfo_to_major(u32 socinfo)
 98{
 99	return FIELD_GET(SOCINFO_MAJOR, socinfo);
100}
101
102static inline unsigned int socinfo_to_minor(u32 socinfo)
103{
104	return FIELD_GET(SOCINFO_MINOR, socinfo);
105}
106
107static inline unsigned int socinfo_to_pack(u32 socinfo)
108{
109	return FIELD_GET(SOCINFO_PACK, socinfo);
110}
111
112static inline unsigned int socinfo_to_misc(u32 socinfo)
113{
114	return FIELD_GET(SOCINFO_MISC, socinfo);
115}
116
117static const char *socinfo_to_package_id(u32 socinfo)
118{
119	unsigned int pack = socinfo_to_pack(socinfo);
120	unsigned int major = socinfo_to_major(socinfo);
121	int i;
122
123	for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
124		if (soc_packages[i].major_id == major &&
125		    soc_packages[i].pack_id ==
126				(pack & soc_packages[i].pack_mask))
127			return soc_packages[i].name;
128	}
129
130	return "Unknown";
131}
132
133static const char *socinfo_to_soc_id(u32 socinfo)
134{
135	unsigned int id = socinfo_to_major(socinfo);
136	int i;
137
138	for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
139		if (soc_ids[i].id == id)
140			return soc_ids[i].name;
141	}
142
143	return "Unknown";
144}
145
146static int __init meson_gx_socinfo_init(void)
147{
148	struct soc_device_attribute *soc_dev_attr;
149	struct soc_device *soc_dev;
150	struct device_node *np;
151	struct regmap *regmap;
152	unsigned int socinfo;
153	struct device *dev;
154	int ret;
155
156	/* look up for chipid node */
157	np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
158	if (!np)
159		return -ENODEV;
160
161	/* check if interface is enabled */
162	if (!of_device_is_available(np)) {
163		of_node_put(np);
164		return -ENODEV;
165	}
166
167	/* check if chip-id is available */
168	if (!of_property_read_bool(np, "amlogic,has-chip-id")) {
169		of_node_put(np);
170		return -ENODEV;
171	}
172
173	/* node should be a syscon */
174	regmap = syscon_node_to_regmap(np);
175	of_node_put(np);
176	if (IS_ERR(regmap)) {
177		pr_err("%s: failed to get regmap\n", __func__);
178		return -ENODEV;
179	}
180
181	ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
182	if (ret < 0)
183		return ret;
184
185	if (!socinfo) {
186		pr_err("%s: invalid chipid value\n", __func__);
187		return -EINVAL;
188	}
189
190	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
191	if (!soc_dev_attr)
192		return -ENODEV;
193
194	soc_dev_attr->family = "Amlogic Meson";
195	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
196					   socinfo_to_major(socinfo),
197					   socinfo_to_minor(socinfo),
198					   socinfo_to_pack(socinfo),
199					   socinfo_to_misc(socinfo));
200	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
201					 socinfo_to_soc_id(socinfo),
202					 socinfo_to_package_id(socinfo));
203
204	soc_dev = soc_device_register(soc_dev_attr);
205	if (IS_ERR(soc_dev)) {
206		kfree(soc_dev_attr->revision);
207		kfree_const(soc_dev_attr->soc_id);
208		kfree(soc_dev_attr);
209		return PTR_ERR(soc_dev);
210	}
211	dev = soc_device_to_device(soc_dev);
212
213	dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
214			soc_dev_attr->soc_id,
215			socinfo_to_major(socinfo),
216			socinfo_to_minor(socinfo),
217			socinfo_to_pack(socinfo),
218			socinfo_to_misc(socinfo));
219
220	return 0;
221}
222device_initcall(meson_gx_socinfo_init);