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/*
* Copyright (c) 2017 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.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 AO_SEC_SD_CFG8 0xe0
#define AO_SEC_SOCINFO_OFFSET AO_SEC_SD_CFG8
#define SOCINFO_MAJOR GENMASK(31, 24)
#define SOCINFO_PACK GENMASK(23, 16)
#define SOCINFO_MINOR GENMASK(15, 8)
#define SOCINFO_MISC GENMASK(7, 0)
static const struct meson_gx_soc_id {
const char *name;
unsigned int id;
} soc_ids[] = {
{ "GXBB", 0x1f },
{ "GXTVBB", 0x20 },
{ "GXL", 0x21 },
{ "GXM", 0x22 },
{ "TXL", 0x23 },
};
static const struct meson_gx_package_id {
const char *name;
unsigned int major_id;
unsigned int pack_id;
} soc_packages[] = {
{ "S905", 0x1f, 0 },
{ "S905M", 0x1f, 0x20 },
{ "S905D", 0x21, 0 },
{ "S905X", 0x21, 0x80 },
{ "S905L", 0x21, 0xc0 },
{ "S905M2", 0x21, 0xe0 },
{ "S912", 0x22, 0 },
};
static inline unsigned int socinfo_to_major(u32 socinfo)
{
return FIELD_GET(SOCINFO_MAJOR, socinfo);
}
static inline unsigned int socinfo_to_minor(u32 socinfo)
{
return FIELD_GET(SOCINFO_MINOR, socinfo);
}
static inline unsigned int socinfo_to_pack(u32 socinfo)
{
return FIELD_GET(SOCINFO_PACK, socinfo);
}
static inline unsigned int socinfo_to_misc(u32 socinfo)
{
return FIELD_GET(SOCINFO_MISC, socinfo);
}
static const char *socinfo_to_package_id(u32 socinfo)
{
unsigned int pack = socinfo_to_pack(socinfo) & 0xf0;
unsigned int major = socinfo_to_major(socinfo);
int i;
for (i = 0 ; i < ARRAY_SIZE(soc_packages) ; ++i) {
if (soc_packages[i].major_id == major &&
soc_packages[i].pack_id == pack)
return soc_packages[i].name;
}
return "Unknown";
}
static const char *socinfo_to_soc_id(u32 socinfo)
{
unsigned int id = socinfo_to_major(socinfo);
int i;
for (i = 0 ; i < ARRAY_SIZE(soc_ids) ; ++i) {
if (soc_ids[i].id == id)
return soc_ids[i].name;
}
return "Unknown";
}
static int __init meson_gx_socinfo_init(void)
{
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
struct device_node *np;
struct regmap *regmap;
unsigned int socinfo;
struct device *dev;
int ret;
/* look up for chipid node */
np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gx-ao-secure");
if (!np)
return -ENODEV;
/* check if interface is enabled */
if (!of_device_is_available(np))
return -ENODEV;
/* check if chip-id is available */
if (!of_property_read_bool(np, "amlogic,has-chip-id"))
return -ENODEV;
/* node should be a syscon */
regmap = syscon_node_to_regmap(np);
of_node_put(np);
if (IS_ERR(regmap)) {
pr_err("%s: failed to get regmap\n", __func__);
return -ENODEV;
}
ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo);
if (ret < 0)
return ret;
if (!socinfo) {
pr_err("%s: invalid chipid value\n", __func__);
return -EINVAL;
}
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 = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
socinfo_to_major(socinfo),
socinfo_to_minor(socinfo),
socinfo_to_pack(socinfo),
socinfo_to_misc(socinfo));
soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
socinfo_to_soc_id(socinfo),
socinfo_to_package_id(socinfo));
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr->revision);
kfree_const(soc_dev_attr->soc_id);
kfree(soc_dev_attr);
return PTR_ERR(soc_dev);
}
dev = soc_device_to_device(soc_dev);
dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected\n",
soc_dev_attr->soc_id,
socinfo_to_major(socinfo),
socinfo_to_minor(socinfo),
socinfo_to_pack(socinfo),
socinfo_to_misc(socinfo));
return 0;
}
device_initcall(meson_gx_socinfo_init);
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