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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k3-socinfo.c (3604B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * TI K3 SoC info driver
      4 *
      5 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
      6 */
      7
      8#include <linux/mfd/syscon.h>
      9#include <linux/of.h>
     10#include <linux/of_address.h>
     11#include <linux/regmap.h>
     12#include <linux/platform_device.h>
     13#include <linux/slab.h>
     14#include <linux/string.h>
     15#include <linux/sys_soc.h>
     16
     17#define CTRLMMR_WKUP_JTAGID_REG		0
     18/*
     19 * Bits:
     20 *  31-28 VARIANT	Device variant
     21 *  27-12 PARTNO	Part number
     22 *  11-1  MFG		Indicates TI as manufacturer (0x17)
     23 *  1			Always 1
     24 */
     25#define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT	(28)
     26#define CTRLMMR_WKUP_JTAGID_VARIANT_MASK	GENMASK(31, 28)
     27
     28#define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT	(12)
     29#define CTRLMMR_WKUP_JTAGID_PARTNO_MASK		GENMASK(27, 12)
     30
     31#define CTRLMMR_WKUP_JTAGID_MFG_SHIFT		(1)
     32#define CTRLMMR_WKUP_JTAGID_MFG_MASK		GENMASK(11, 1)
     33
     34#define CTRLMMR_WKUP_JTAGID_MFG_TI		0x17
     35
     36static const struct k3_soc_id {
     37	unsigned int id;
     38	const char *family_name;
     39} k3_soc_ids[] = {
     40	{ 0xBB5A, "AM65X" },
     41	{ 0xBB64, "J721E" },
     42	{ 0xBB6D, "J7200" },
     43	{ 0xBB38, "AM64X" },
     44	{ 0xBB75, "J721S2"},
     45	{ 0xBB7E, "AM62X" },
     46};
     47
     48static int
     49k3_chipinfo_partno_to_names(unsigned int partno,
     50			    struct soc_device_attribute *soc_dev_attr)
     51{
     52	int i;
     53
     54	for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
     55		if (partno == k3_soc_ids[i].id) {
     56			soc_dev_attr->family = k3_soc_ids[i].family_name;
     57			return 0;
     58		}
     59
     60	return -EINVAL;
     61}
     62
     63static int k3_chipinfo_probe(struct platform_device *pdev)
     64{
     65	struct device_node *node = pdev->dev.of_node;
     66	struct soc_device_attribute *soc_dev_attr;
     67	struct device *dev = &pdev->dev;
     68	struct soc_device *soc_dev;
     69	struct regmap *regmap;
     70	u32 partno_id;
     71	u32 variant;
     72	u32 jtag_id;
     73	u32 mfg;
     74	int ret;
     75
     76	regmap = device_node_to_regmap(node);
     77	if (IS_ERR(regmap))
     78		return PTR_ERR(regmap);
     79
     80	ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
     81	if (ret < 0)
     82		return ret;
     83
     84	mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
     85	       CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
     86
     87	if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
     88		dev_err(dev, "Invalid MFG SoC\n");
     89		return -ENODEV;
     90	}
     91
     92	variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
     93		  CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
     94	variant++;
     95
     96	partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
     97		 CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
     98
     99	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
    100	if (!soc_dev_attr)
    101		return -ENOMEM;
    102
    103	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
    104	if (!soc_dev_attr->revision) {
    105		ret = -ENOMEM;
    106		goto err;
    107	}
    108
    109	ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
    110	if (ret) {
    111		dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
    112		ret = -ENODEV;
    113		goto err_free_rev;
    114	}
    115
    116	node = of_find_node_by_path("/");
    117	of_property_read_string(node, "model", &soc_dev_attr->machine);
    118	of_node_put(node);
    119
    120	soc_dev = soc_device_register(soc_dev_attr);
    121	if (IS_ERR(soc_dev)) {
    122		ret = PTR_ERR(soc_dev);
    123		goto err_free_rev;
    124	}
    125
    126	dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
    127		 soc_dev_attr->family,
    128		 soc_dev_attr->revision, jtag_id);
    129
    130	return 0;
    131
    132err_free_rev:
    133	kfree(soc_dev_attr->revision);
    134err:
    135	kfree(soc_dev_attr);
    136	return ret;
    137}
    138
    139static const struct of_device_id k3_chipinfo_of_match[] = {
    140	{ .compatible = "ti,am654-chipid", },
    141	{ /* sentinel */ },
    142};
    143
    144static struct platform_driver k3_chipinfo_driver = {
    145	.driver = {
    146		.name = "k3-chipinfo",
    147		.of_match_table = k3_chipinfo_of_match,
    148	},
    149	.probe = k3_chipinfo_probe,
    150};
    151
    152static int __init k3_chipinfo_init(void)
    153{
    154	return platform_driver_register(&k3_chipinfo_driver);
    155}
    156subsys_initcall(k3_chipinfo_init);