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// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright 2019 IBM Corp. */
#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>
static struct {
const char *name;
const u32 id;
} const rev_table[] = {
/* AST2400 */
{ "AST2400", 0x02000303 },
{ "AST1400", 0x02010103 },
{ "AST1250", 0x02010303 },
/* AST2500 */
{ "AST2500", 0x04000303 },
{ "AST2510", 0x04000103 },
{ "AST2520", 0x04000203 },
{ "AST2530", 0x04000403 },
/* AST2600 */
{ "AST2600", 0x05000303 },
{ "AST2620", 0x05010203 },
};
static const char *siliconid_to_name(u32 siliconid)
{
unsigned int id = siliconid & 0xff00ffff;
unsigned int i;
for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) {
if (rev_table[i].id == id)
return rev_table[i].name;
}
return "Unknown";
}
static const char *siliconid_to_rev(u32 siliconid)
{
unsigned int rev = (siliconid >> 16) & 0xff;
switch (rev) {
case 0:
return "A0";
case 1:
return "A1";
case 3:
return "A2";
};
return "??";
}
static int __init aspeed_socinfo_init(void)
{
struct soc_device_attribute *attrs;
struct soc_device *soc_dev;
struct device_node *np;
void __iomem *reg;
bool has_chipid = false;
u32 siliconid;
u32 chipid[2];
const char *machine = NULL;
np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id");
if (!of_device_is_available(np)) {
of_node_put(np);
return -ENODEV;
}
reg = of_iomap(np, 0);
if (!reg)
return -ENODEV;
siliconid = readl(reg);
iounmap(reg);
/* This is optional, the ast2400 does not have it */
reg = of_iomap(np, 1);
if (reg) {
has_chipid = true;
chipid[0] = readl(reg);
chipid[1] = readl(reg + 4);
iounmap(reg);
}
of_node_put(np);
attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
if (!attrs)
return -ENODEV;
/*
* Machine: Romulus BMC
* Family: AST2500
* Revision: A1
* SoC ID: raw silicon revision id
* Serial Number: 64-bit chipid
*/
np = of_find_node_by_path("/");
of_property_read_string(np, "model", &machine);
if (machine)
attrs->machine = kstrdup(machine, GFP_KERNEL);
of_node_put(np);
attrs->family = siliconid_to_name(siliconid);
attrs->revision = siliconid_to_rev(siliconid);
attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid);
if (has_chipid)
attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x",
chipid[1], chipid[0]);
soc_dev = soc_device_register(attrs);
if (IS_ERR(soc_dev)) {
kfree(attrs->soc_id);
kfree(attrs->serial_number);
kfree(attrs);
return PTR_ERR(soc_dev);
}
pr_info("ASPEED %s rev %s (%s)\n",
attrs->family,
attrs->revision,
attrs->soc_id);
return 0;
}
early_initcall(aspeed_socinfo_init);
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