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125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Nintendo Wii and Wii U OTP driver
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*
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* This is a driver exposing the OTP of a Nintendo Wii or Wii U console.
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*
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* This memory contains common and per-console keys, signatures and
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* related data required to access peripherals.
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*
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* Based on reversed documentation from https://wiiubrew.org/wiki/Hardware/OTP
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*
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* Copyright (C) 2021 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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*/
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/nvmem-provider.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#define HW_OTPCMD 0
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#define HW_OTPDATA 4
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#define OTP_READ 0x80000000
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#define BANK_SIZE 128
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#define WORD_SIZE 4
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struct nintendo_otp_priv {
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void __iomem *regs;
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};
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struct nintendo_otp_devtype_data {
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const char *name;
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unsigned int num_banks;
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};
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static const struct nintendo_otp_devtype_data hollywood_otp_data = {
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.name = "wii-otp",
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.num_banks = 1,
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};
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static const struct nintendo_otp_devtype_data latte_otp_data = {
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.name = "wiiu-otp",
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.num_banks = 8,
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};
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static int nintendo_otp_reg_read(void *context,
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unsigned int reg, void *_val, size_t bytes)
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{
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struct nintendo_otp_priv *priv = context;
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u32 *val = _val;
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int words = bytes / WORD_SIZE;
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u32 bank, addr;
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while (words--) {
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bank = (reg / BANK_SIZE) << 8;
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addr = (reg / WORD_SIZE) % (BANK_SIZE / WORD_SIZE);
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iowrite32be(OTP_READ | bank | addr, priv->regs + HW_OTPCMD);
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*val++ = ioread32be(priv->regs + HW_OTPDATA);
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reg += WORD_SIZE;
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}
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return 0;
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}
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static const struct of_device_id nintendo_otp_of_table[] = {
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{ .compatible = "nintendo,hollywood-otp", .data = &hollywood_otp_data },
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{ .compatible = "nintendo,latte-otp", .data = &latte_otp_data },
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, nintendo_otp_of_table);
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static int nintendo_otp_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct of_device_id *of_id =
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of_match_device(nintendo_otp_of_table, dev);
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struct resource *res;
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struct nvmem_device *nvmem;
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struct nintendo_otp_priv *priv;
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struct nvmem_config config = {
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.stride = WORD_SIZE,
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.word_size = WORD_SIZE,
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.reg_read = nintendo_otp_reg_read,
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.read_only = true,
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.root_only = true,
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};
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(priv->regs))
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return PTR_ERR(priv->regs);
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if (of_id->data) {
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const struct nintendo_otp_devtype_data *data = of_id->data;
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config.name = data->name;
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config.size = data->num_banks * BANK_SIZE;
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}
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config.dev = dev;
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config.priv = priv;
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nvmem = devm_nvmem_register(dev, &config);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static struct platform_driver nintendo_otp_driver = {
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.probe = nintendo_otp_probe,
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.driver = {
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.name = "nintendo-otp",
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.of_match_table = nintendo_otp_of_table,
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},
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};
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module_platform_driver(nintendo_otp_driver);
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MODULE_AUTHOR("Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>");
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MODULE_DESCRIPTION("Nintendo Wii and Wii U OTP driver");
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MODULE_LICENSE("GPL v2");
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