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authorEmmanuel Gil Peyrot <linkmauve@linkmauve.fr>2021-08-10 18:30:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-08-13 11:27:20 +0300
commit3683b761fe3a10ad18515acd5368dd601268cfe5 (patch)
treeb374fb59a83a8ade2ff5eee281e8b3db72c26825 /drivers/nvmem
parent9aaf4d2a08182b7ef6d939642a6d92564bd83b2f (diff)
downloadlinux-3683b761fe3a10ad18515acd5368dd601268cfe5.tar.xz
nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP
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>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/Kconfig11
-rw-r--r--drivers/nvmem/Makefile2
-rw-r--r--drivers/nvmem/nintendo-otp.c124
3 files changed, 137 insertions, 0 deletions
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index dd2019006838..39854d43758b 100644
--- 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
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index bbea1410240a..dcbbde35b6a8 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -23,6 +23,8 @@ obj-$(CONFIG_NVMEM_LPC18XX_OTP) += nvmem_lpc18xx_otp.o
nvmem_lpc18xx_otp-y := lpc18xx_otp.o
obj-$(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
diff --git a/drivers/nvmem/nintendo-otp.c b/drivers/nvmem/nintendo-otp.c
new file mode 100644
index 000000000000..33961b17f9f1
--- /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");