cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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soc-integrator.c (3437B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2014 Linaro Ltd.
      4 *
      5 * Author: Linus Walleij <linus.walleij@linaro.org>
      6 */
      7#include <linux/init.h>
      8#include <linux/io.h>
      9#include <linux/slab.h>
     10#include <linux/sys_soc.h>
     11#include <linux/platform_device.h>
     12#include <linux/mfd/syscon.h>
     13#include <linux/regmap.h>
     14#include <linux/of.h>
     15
     16#define INTEGRATOR_HDR_ID_OFFSET	0x00
     17
     18static u32 integrator_coreid;
     19
     20static const struct of_device_id integrator_cm_match[] = {
     21	{ .compatible = "arm,core-module-integrator", },
     22	{ }
     23};
     24
     25static const char *integrator_arch_str(u32 id)
     26{
     27	switch ((id >> 16) & 0xff) {
     28	case 0x00:
     29		return "ASB little-endian";
     30	case 0x01:
     31		return "AHB little-endian";
     32	case 0x03:
     33		return "AHB-Lite system bus, bi-endian";
     34	case 0x04:
     35		return "AHB";
     36	case 0x08:
     37		return "AHB system bus, ASB processor bus";
     38	default:
     39		return "Unknown";
     40	}
     41}
     42
     43static const char *integrator_fpga_str(u32 id)
     44{
     45	switch ((id >> 12) & 0xf) {
     46	case 0x01:
     47		return "XC4062";
     48	case 0x02:
     49		return "XC4085";
     50	case 0x03:
     51		return "XVC600";
     52	case 0x04:
     53		return "EPM7256AE (Altera PLD)";
     54	default:
     55		return "Unknown";
     56	}
     57}
     58
     59static ssize_t
     60manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
     61{
     62	return sprintf(buf, "%02x\n", integrator_coreid >> 24);
     63}
     64
     65static DEVICE_ATTR_RO(manufacturer);
     66
     67static ssize_t
     68arch_show(struct device *dev, struct device_attribute *attr, char *buf)
     69{
     70	return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
     71}
     72
     73static DEVICE_ATTR_RO(arch);
     74
     75static ssize_t
     76fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
     77{
     78	return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
     79}
     80
     81static DEVICE_ATTR_RO(fpga);
     82
     83static ssize_t
     84build_show(struct device *dev, struct device_attribute *attr, char *buf)
     85{
     86	return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
     87}
     88
     89static DEVICE_ATTR_RO(build);
     90
     91static struct attribute *integrator_attrs[] = {
     92	&dev_attr_manufacturer.attr,
     93	&dev_attr_arch.attr,
     94	&dev_attr_fpga.attr,
     95	&dev_attr_build.attr,
     96	NULL
     97};
     98
     99ATTRIBUTE_GROUPS(integrator);
    100
    101static int __init integrator_soc_init(void)
    102{
    103	struct regmap *syscon_regmap;
    104	struct soc_device *soc_dev;
    105	struct soc_device_attribute *soc_dev_attr;
    106	struct device_node *np;
    107	struct device *dev;
    108	u32 val;
    109	int ret;
    110
    111	np = of_find_matching_node(NULL, integrator_cm_match);
    112	if (!np)
    113		return -ENODEV;
    114
    115	syscon_regmap = syscon_node_to_regmap(np);
    116	if (IS_ERR(syscon_regmap))
    117		return PTR_ERR(syscon_regmap);
    118
    119	ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
    120			  &val);
    121	if (ret)
    122		return -ENODEV;
    123	integrator_coreid = val;
    124
    125	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
    126	if (!soc_dev_attr)
    127		return -ENOMEM;
    128
    129	soc_dev_attr->soc_id = "Integrator";
    130	soc_dev_attr->machine = "Integrator";
    131	soc_dev_attr->family = "Versatile";
    132	soc_dev_attr->custom_attr_group = integrator_groups[0];
    133	soc_dev = soc_device_register(soc_dev_attr);
    134	if (IS_ERR(soc_dev)) {
    135		kfree(soc_dev_attr);
    136		return -ENODEV;
    137	}
    138	dev = soc_device_to_device(soc_dev);
    139
    140	dev_info(dev, "Detected ARM core module:\n");
    141	dev_info(dev, "    Manufacturer: %02x\n", (val >> 24));
    142	dev_info(dev, "    Architecture: %s\n", integrator_arch_str(val));
    143	dev_info(dev, "    FPGA: %s\n", integrator_fpga_str(val));
    144	dev_info(dev, "    Build: %02x\n", (val >> 4) & 0xFF);
    145	dev_info(dev, "    Rev: %c\n", ('A' + (val & 0x03)));
    146
    147	return 0;
    148}
    149device_initcall(integrator_soc_init);