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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Nintendo Wii and Wii U OTP driver4 *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 and8 * related data required to access peripherals.9 *10 * Based on reversed documentation from https://wiiubrew.org/wiki/Hardware/OTP11 *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 024#define HW_OTPDATA 425#define OTP_READ 0x8000000026#define BANK_SIZE 12827#define WORD_SIZE 428 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 nvmem_device *nvmem;80 struct nintendo_otp_priv *priv;81 82 struct nvmem_config config = {83 .stride = WORD_SIZE,84 .word_size = WORD_SIZE,85 .reg_read = nintendo_otp_reg_read,86 .read_only = true,87 .root_only = true,88 };89 90 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);91 if (!priv)92 return -ENOMEM;93 94 priv->regs = devm_platform_ioremap_resource(pdev, 0);95 if (IS_ERR(priv->regs))96 return PTR_ERR(priv->regs);97 98 if (of_id->data) {99 const struct nintendo_otp_devtype_data *data = of_id->data;100 config.name = data->name;101 config.size = data->num_banks * BANK_SIZE;102 }103 104 config.dev = dev;105 config.priv = priv;106 107 nvmem = devm_nvmem_register(dev, &config);108 109 return PTR_ERR_OR_ZERO(nvmem);110}111 112static struct platform_driver nintendo_otp_driver = {113 .probe = nintendo_otp_probe,114 .driver = {115 .name = "nintendo-otp",116 .of_match_table = nintendo_otp_of_table,117 },118};119module_platform_driver(nintendo_otp_driver);120MODULE_AUTHOR("Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>");121MODULE_DESCRIPTION("Nintendo Wii and Wii U OTP driver");122MODULE_LICENSE("GPL v2");123