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