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-realview.c (3176B)

      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/* System ID in syscon */
     17#define REALVIEW_SYS_ID_OFFSET 0x00
     18
     19static const struct of_device_id realview_soc_of_match[] = {
     20	{ .compatible = "arm,realview-eb-soc",	},
     21	{ .compatible = "arm,realview-pb1176-soc", },
     22	{ .compatible = "arm,realview-pb11mp-soc", },
     23	{ .compatible = "arm,realview-pba8-soc", },
     24	{ .compatible = "arm,realview-pbx-soc", },
     25	{ }
     26};
     27
     28static u32 realview_coreid;
     29
     30static const char *realview_arch_str(u32 id)
     31{
     32	switch ((id >> 8) & 0xf) {
     33	case 0x04:
     34		return "AHB";
     35	case 0x05:
     36		return "Multi-layer AXI";
     37	default:
     38		return "Unknown";
     39	}
     40}
     41
     42static ssize_t
     43manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
     44{
     45	return sprintf(buf, "%02x\n", realview_coreid >> 24);
     46}
     47
     48static DEVICE_ATTR_RO(manufacturer);
     49
     50static ssize_t
     51board_show(struct device *dev, struct device_attribute *attr, char *buf)
     52{
     53	return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
     54}
     55
     56static DEVICE_ATTR_RO(board);
     57
     58static ssize_t
     59fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
     60{
     61	return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
     62}
     63
     64static DEVICE_ATTR_RO(fpga);
     65
     66static ssize_t
     67build_show(struct device *dev, struct device_attribute *attr, char *buf)
     68{
     69	return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
     70}
     71
     72static DEVICE_ATTR_RO(build);
     73
     74static struct attribute *realview_attrs[] = {
     75	&dev_attr_manufacturer.attr,
     76	&dev_attr_board.attr,
     77	&dev_attr_fpga.attr,
     78	&dev_attr_build.attr,
     79	NULL
     80};
     81
     82ATTRIBUTE_GROUPS(realview);
     83
     84static int realview_soc_probe(struct platform_device *pdev)
     85{
     86	struct regmap *syscon_regmap;
     87	struct soc_device *soc_dev;
     88	struct soc_device_attribute *soc_dev_attr;
     89	struct device_node *np = pdev->dev.of_node;
     90	int ret;
     91
     92	syscon_regmap = syscon_regmap_lookup_by_phandle(np, "regmap");
     93	if (IS_ERR(syscon_regmap))
     94		return PTR_ERR(syscon_regmap);
     95
     96	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
     97	if (!soc_dev_attr)
     98		return -ENOMEM;
     99
    100	ret = of_property_read_string(np, "compatible",
    101				      &soc_dev_attr->soc_id);
    102	if (ret)
    103		return -EINVAL;
    104
    105	soc_dev_attr->machine = "RealView";
    106	soc_dev_attr->family = "Versatile";
    107	soc_dev_attr->custom_attr_group = realview_groups[0];
    108	soc_dev = soc_device_register(soc_dev_attr);
    109	if (IS_ERR(soc_dev)) {
    110		kfree(soc_dev_attr);
    111		return -ENODEV;
    112	}
    113	ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
    114			  &realview_coreid);
    115	if (ret)
    116		return -ENODEV;
    117
    118	dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
    119		 realview_coreid,
    120		 ((realview_coreid >> 16) & 0xfff));
    121	/* FIXME: add attributes for SoC to sysfs */
    122	return 0;
    123}
    124
    125static struct platform_driver realview_soc_driver = {
    126	.probe = realview_soc_probe,
    127	.driver = {
    128		.name = "realview-soc",
    129		.of_match_table = realview_soc_of_match,
    130	},
    131};
    132builtin_platform_driver(realview_soc_driver);