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/*
* Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.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 MESON_SOCINFO_MAJOR_VER_MESON6 0x16
#define MESON_SOCINFO_MAJOR_VER_MESON8 0x19
#define MESON_SOCINFO_MAJOR_VER_MESON8B 0x1b
#define MESON_MX_ASSIST_HW_REV 0x14c
#define MESON_MX_ANALOG_TOP_METAL_REVISION 0x0
#define MESON_MX_BOOTROM_MISC_VER 0x4
static const char *meson_mx_socinfo_revision(unsigned int major_ver,
unsigned int misc_ver,
unsigned int metal_rev)
{
unsigned int minor_ver;
switch (major_ver) {
case MESON_SOCINFO_MAJOR_VER_MESON6:
minor_ver = 0xa;
break;
case MESON_SOCINFO_MAJOR_VER_MESON8:
if (metal_rev == 0x11111112)
major_ver = 0x1d;
if (metal_rev == 0x11111111 || metal_rev == 0x11111112)
minor_ver = 0xa;
else if (metal_rev == 0x11111113)
minor_ver = 0xb;
else if (metal_rev == 0x11111133)
minor_ver = 0xc;
else
minor_ver = 0xd;
break;
case MESON_SOCINFO_MAJOR_VER_MESON8B:
if (metal_rev == 0x11111111)
minor_ver = 0xa;
else
minor_ver = 0xb;
break;
default:
minor_ver = 0x0;
break;
}
return kasprintf(GFP_KERNEL, "Rev%X (%x - 0:%X)", minor_ver, major_ver,
misc_ver);
}
static const char *meson_mx_socinfo_soc_id(unsigned int major_ver,
unsigned int metal_rev)
{
const char *soc_id;
switch (major_ver) {
case MESON_SOCINFO_MAJOR_VER_MESON6:
soc_id = "Meson6 (AML8726-MX)";
break;
case MESON_SOCINFO_MAJOR_VER_MESON8:
if (metal_rev == 0x11111112)
soc_id = "Meson8m2 (S812)";
else
soc_id = "Meson8 (S802)";
break;
case MESON_SOCINFO_MAJOR_VER_MESON8B:
soc_id = "Meson8b (S805)";
break;
default:
soc_id = "Unknown";
break;
}
return kstrdup_const(soc_id, GFP_KERNEL);
}
static const struct of_device_id meson_mx_socinfo_analog_top_ids[] = {
{ .compatible = "amlogic,meson8-analog-top", },
{ .compatible = "amlogic,meson8b-analog-top", },
{ /* sentinel */ }
};
static int __init meson_mx_socinfo_init(void)
{
struct soc_device_attribute *soc_dev_attr;
struct soc_device *soc_dev;
struct device_node *np;
struct regmap *assist_regmap, *bootrom_regmap, *analog_top_regmap;
unsigned int major_ver, misc_ver, metal_rev = 0;
int ret;
assist_regmap =
syscon_regmap_lookup_by_compatible("amlogic,meson-mx-assist");
if (IS_ERR(assist_regmap))
return PTR_ERR(assist_regmap);
bootrom_regmap =
syscon_regmap_lookup_by_compatible("amlogic,meson-mx-bootrom");
if (IS_ERR(bootrom_regmap))
return PTR_ERR(bootrom_regmap);
np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
if (np) {
analog_top_regmap = syscon_node_to_regmap(np);
of_node_put(np);
if (IS_ERR(analog_top_regmap))
return PTR_ERR(analog_top_regmap);
ret = regmap_read(analog_top_regmap,
MESON_MX_ANALOG_TOP_METAL_REVISION,
&metal_rev);
if (ret)
return ret;
}
ret = regmap_read(assist_regmap, MESON_MX_ASSIST_HW_REV, &major_ver);
if (ret < 0)
return ret;
ret = regmap_read(bootrom_regmap, MESON_MX_BOOTROM_MISC_VER,
&misc_ver);
if (ret < 0)
return ret;
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 = meson_mx_socinfo_revision(major_ver, misc_ver,
metal_rev);
soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
soc_dev = soc_device_register(soc_dev_attr);
if (IS_ERR(soc_dev)) {
kfree_const(soc_dev_attr->revision);
kfree_const(soc_dev_attr->soc_id);
kfree(soc_dev_attr);
return PTR_ERR(soc_dev);
}
dev_info(soc_device_to_device(soc_dev), "Amlogic %s %s detected\n",
soc_dev_attr->soc_id, soc_dev_attr->revision);
return 0;
}
device_initcall(meson_mx_socinfo_init);
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