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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nintendo-otp.c (3166B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Nintendo Wii and Wii U OTP driver
      4 *
      5 * This is a driver exposing the OTP of a Nintendo Wii or Wii U console.
      6 *
      7 * This memory contains common and per-console keys, signatures and
      8 * related data required to access peripherals.
      9 *
     10 * Based on reversed documentation from https://wiiubrew.org/wiki/Hardware/OTP
     11 *
     12 * Copyright (C) 2021 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
     13 */
     14
     15#include <linux/device.h>
     16#include <linux/io.h>
     17#include <linux/module.h>
     18#include <linux/mod_devicetable.h>
     19#include <linux/nvmem-provider.h>
     20#include <linux/of_device.h>
     21#include <linux/platform_device.h>
     22
     23#define HW_OTPCMD  0
     24#define HW_OTPDATA 4
     25#define OTP_READ   0x80000000
     26#define BANK_SIZE  128
     27#define WORD_SIZE  4
     28
     29struct nintendo_otp_priv {
     30	void __iomem *regs;
     31};
     32
     33struct nintendo_otp_devtype_data {
     34	const char *name;
     35	unsigned int num_banks;
     36};
     37
     38static const struct nintendo_otp_devtype_data hollywood_otp_data = {
     39	.name = "wii-otp",
     40	.num_banks = 1,
     41};
     42
     43static const struct nintendo_otp_devtype_data latte_otp_data = {
     44	.name = "wiiu-otp",
     45	.num_banks = 8,
     46};
     47
     48static int nintendo_otp_reg_read(void *context,
     49				 unsigned int reg, void *_val, size_t bytes)
     50{
     51	struct nintendo_otp_priv *priv = context;
     52	u32 *val = _val;
     53	int words = bytes / WORD_SIZE;
     54	u32 bank, addr;
     55
     56	while (words--) {
     57		bank = (reg / BANK_SIZE) << 8;
     58		addr = (reg / WORD_SIZE) % (BANK_SIZE / WORD_SIZE);
     59		iowrite32be(OTP_READ | bank | addr, priv->regs + HW_OTPCMD);
     60		*val++ = ioread32be(priv->regs + HW_OTPDATA);
     61		reg += WORD_SIZE;
     62	}
     63
     64	return 0;
     65}
     66
     67static const struct of_device_id nintendo_otp_of_table[] = {
     68	{ .compatible = "nintendo,hollywood-otp", .data = &hollywood_otp_data },
     69	{ .compatible = "nintendo,latte-otp", .data = &latte_otp_data },
     70	{/* sentinel */},
     71};
     72MODULE_DEVICE_TABLE(of, nintendo_otp_of_table);
     73
     74static int nintendo_otp_probe(struct platform_device *pdev)
     75{
     76	struct device *dev = &pdev->dev;
     77	const struct of_device_id *of_id =
     78		of_match_device(nintendo_otp_of_table, dev);
     79	struct resource *res;
     80	struct nvmem_device *nvmem;
     81	struct nintendo_otp_priv *priv;
     82
     83	struct nvmem_config config = {
     84		.stride = WORD_SIZE,
     85		.word_size = WORD_SIZE,
     86		.reg_read = nintendo_otp_reg_read,
     87		.read_only = true,
     88		.root_only = true,
     89	};
     90
     91	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
     92	if (!priv)
     93		return -ENOMEM;
     94
     95	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     96	priv->regs = devm_ioremap_resource(dev, res);
     97	if (IS_ERR(priv->regs))
     98		return PTR_ERR(priv->regs);
     99
    100	if (of_id->data) {
    101		const struct nintendo_otp_devtype_data *data = of_id->data;
    102		config.name = data->name;
    103		config.size = data->num_banks * BANK_SIZE;
    104	}
    105
    106	config.dev = dev;
    107	config.priv = priv;
    108
    109	nvmem = devm_nvmem_register(dev, &config);
    110
    111	return PTR_ERR_OR_ZERO(nvmem);
    112}
    113
    114static struct platform_driver nintendo_otp_driver = {
    115	.probe = nintendo_otp_probe,
    116	.driver = {
    117		.name = "nintendo-otp",
    118		.of_match_table = nintendo_otp_of_table,
    119	},
    120};
    121module_platform_driver(nintendo_otp_driver);
    122MODULE_AUTHOR("Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>");
    123MODULE_DESCRIPTION("Nintendo Wii and Wii U OTP driver");
    124MODULE_LICENSE("GPL v2");