cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

aspeed-socinfo.c (3072B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/* Copyright 2019 IBM Corp. */
      3
      4#include <linux/io.h>
      5#include <linux/of.h>
      6#include <linux/of_address.h>
      7#include <linux/of_platform.h>
      8#include <linux/platform_device.h>
      9#include <linux/slab.h>
     10#include <linux/sys_soc.h>
     11
     12static struct {
     13	const char *name;
     14	const u32 id;
     15} const rev_table[] = {
     16	/* AST2400 */
     17	{ "AST2400", 0x02000303 },
     18	{ "AST1400", 0x02010103 },
     19	{ "AST1250", 0x02010303 },
     20	/* AST2500 */
     21	{ "AST2500", 0x04000303 },
     22	{ "AST2510", 0x04000103 },
     23	{ "AST2520", 0x04000203 },
     24	{ "AST2530", 0x04000403 },
     25	/* AST2600 */
     26	{ "AST2600", 0x05000303 },
     27	{ "AST2620", 0x05010203 },
     28	{ "AST2605", 0x05030103 },
     29	{ "AST2625", 0x05030403 },
     30};
     31
     32static const char *siliconid_to_name(u32 siliconid)
     33{
     34	unsigned int id = siliconid & 0xff00ffff;
     35	unsigned int i;
     36
     37	for (i = 0 ; i < ARRAY_SIZE(rev_table) ; ++i) {
     38		if (rev_table[i].id == id)
     39			return rev_table[i].name;
     40	}
     41
     42	return "Unknown";
     43}
     44
     45static const char *siliconid_to_rev(u32 siliconid)
     46{
     47	unsigned int rev = (siliconid >> 16) & 0xff;
     48	unsigned int gen = (siliconid >> 24) & 0xff;
     49
     50	if (gen < 0x5) {
     51		/* AST2500 and below */
     52		switch (rev) {
     53		case 0:
     54			return "A0";
     55		case 1:
     56			return "A1";
     57		case 3:
     58			return "A2";
     59		}
     60	} else {
     61		/* AST2600 */
     62		switch (rev) {
     63		case 0:
     64			return "A0";
     65		case 1:
     66			return "A1";
     67		case 2:
     68			return "A2";
     69		case 3:
     70			return "A3";
     71		}
     72	}
     73
     74	return "??";
     75}
     76
     77static int __init aspeed_socinfo_init(void)
     78{
     79	struct soc_device_attribute *attrs;
     80	struct soc_device *soc_dev;
     81	struct device_node *np;
     82	void __iomem *reg;
     83	bool has_chipid = false;
     84	u32 siliconid;
     85	u32 chipid[2];
     86	const char *machine = NULL;
     87
     88	np = of_find_compatible_node(NULL, NULL, "aspeed,silicon-id");
     89	if (!of_device_is_available(np)) {
     90		of_node_put(np);
     91		return -ENODEV;
     92	}
     93
     94	reg = of_iomap(np, 0);
     95	if (!reg) {
     96		of_node_put(np);
     97		return -ENODEV;
     98	}
     99	siliconid = readl(reg);
    100	iounmap(reg);
    101
    102	/* This is optional, the ast2400 does not have it */
    103	reg = of_iomap(np, 1);
    104	if (reg) {
    105		has_chipid = true;
    106		chipid[0] = readl(reg);
    107		chipid[1] = readl(reg + 4);
    108		iounmap(reg);
    109	}
    110	of_node_put(np);
    111
    112	attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
    113	if (!attrs)
    114		return -ENODEV;
    115
    116	/*
    117	 * Machine: Romulus BMC
    118	 * Family: AST2500
    119	 * Revision: A1
    120	 * SoC ID: raw silicon revision id
    121	 * Serial Number: 64-bit chipid
    122	 */
    123
    124	np = of_find_node_by_path("/");
    125	of_property_read_string(np, "model", &machine);
    126	if (machine)
    127		attrs->machine = kstrdup(machine, GFP_KERNEL);
    128	of_node_put(np);
    129
    130	attrs->family = siliconid_to_name(siliconid);
    131	attrs->revision = siliconid_to_rev(siliconid);
    132	attrs->soc_id = kasprintf(GFP_KERNEL, "%08x", siliconid);
    133
    134	if (has_chipid)
    135		attrs->serial_number = kasprintf(GFP_KERNEL, "%08x%08x",
    136						 chipid[1], chipid[0]);
    137
    138	soc_dev = soc_device_register(attrs);
    139	if (IS_ERR(soc_dev)) {
    140		kfree(attrs->soc_id);
    141		kfree(attrs->serial_number);
    142		kfree(attrs);
    143		return PTR_ERR(soc_dev);
    144	}
    145
    146	pr_info("ASPEED %s rev %s (%s)\n",
    147			attrs->family,
    148			attrs->revision,
    149			attrs->soc_id);
    150
    151	return 0;
    152}
    153early_initcall(aspeed_socinfo_init);