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From 3683b761fe3a10ad18515acd5368dd601268cfe5 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Tue, 10 Aug 2021 16:30:36 +0100
Subject: [PATCH] nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP
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This OTP is read-only and contains various keys used by the console to
decrypt, encrypt or verify various pieces of storage.

Its size depends on the console, it is 128 bytes on the Wii and
1024 bytes on the Wii U (split into eight 128 bytes banks).

It can be used directly by writing into one register and reading from
the other one, without any additional synchronisation.

This driver was written based on reversed documentation, see:
https://wiiubrew.org/wiki/Hardware/OTP

Tested-by: Jonathan Neuschäfer <j.ne@posteo.net>  # on Wii
Tested-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>  # on Wii U
Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210810153036.1494-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/nvmem/Kconfig        |  11 ++++
 drivers/nvmem/Makefile       |   2 +
 drivers/nvmem/nintendo-otp.c | 124 +++++++++++++++++++++++++++++++++++
 3 files changed, 137 insertions(+)
 create mode 100644 drivers/nvmem/nintendo-otp.c

--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -107,6 +107,17 @@ config MTK_EFUSE
          This driver can also be built as a module. If so, the module
          will be called efuse-mtk.
 
+config NVMEM_NINTENDO_OTP
+       tristate "Nintendo Wii and Wii U OTP Support"
+       help
+         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.
+
+         This driver can also be built as a module. If so, the module
+         will be called nvmem-nintendo-otp.
+
 config QCOM_QFPROM
        tristate "QCOM QFPROM Support"
        depends on ARCH_QCOM || COMPILE_TEST
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -23,6 +23,8 @@ obj-$(CONFIG_NVMEM_LPC18XX_OTP)       += nvmem
 nvmem_lpc18xx_otp-y            := lpc18xx_otp.o
 obj-$(CONFIG_NVMEM_MXS_OCOTP)  += nvmem-mxs-ocotp.o
 nvmem-mxs-ocotp-y              := mxs-ocotp.o
+obj-$(CONFIG_NVMEM_NINTENDO_OTP)       += nvmem-nintendo-otp.o
+nvmem-nintendo-otp-y           := nintendo-otp.o
 obj-$(CONFIG_MTK_EFUSE)                += nvmem_mtk-efuse.o
 nvmem_mtk-efuse-y              := mtk-efuse.o
 obj-$(CONFIG_QCOM_QFPROM)      += nvmem_qfprom.o
--- /dev/null
+++ b/drivers/nvmem/nintendo-otp.c
@@ -0,0 +1,124 @@
+// 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");