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Message-Id: <20241030140315.40562-3-srinivas.kandagatla@linaro.org>
Date: Wed, 30 Oct 2024 14:03:10 +0000
From: srinivas.kandagatla@...aro.org
To: gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Arnd Bergmann <arnd@...db.de>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 2/7] nvmem: Add R-Car E-FUSE driver
From: Geert Uytterhoeven <geert+renesas@...der.be>
R-Car Gen4 SoCs contain fuses indicating hardware support or hardware
(e.g. tuning) parameters. Add a driver to access the state of the
fuses. This supports two types of hardware fuse providers:
1. E-FUSE non-volatile memory accessible through the Pin Function
Controller on R-Car V3U and S4-8,
2. E-FUSE non-volatile memory accessible through OTP_MEM on R-Car V4H
and V4M.
The state of the cells can be read using the NVMEM framework, either
from kernel space (e.g. by the Renesas UFSHCD driver), or from
userspace.
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
MAINTAINERS | 1 +
drivers/nvmem/Kconfig | 11 +++
drivers/nvmem/Makefile | 2 +
drivers/nvmem/rcar-efuse.c | 142 +++++++++++++++++++++++++++++++++++++
4 files changed, 156 insertions(+)
create mode 100644 drivers/nvmem/rcar-efuse.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 269529b370a0..b3b605a52d3d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2924,6 +2924,7 @@ F: arch/arm/include/debug/renesas-scif.S
F: arch/arm/mach-shmobile/
F: arch/arm64/boot/dts/renesas/
F: arch/riscv/boot/dts/renesas/
+F: drivers/nvmem/rcar-efuse.c
F: drivers/pmdomain/renesas/
F: drivers/soc/renesas/
F: include/linux/soc/renesas/
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index d2c384f58028..8671b7c974b9 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -246,6 +246,17 @@ config NVMEM_RAVE_SP_EEPROM
help
Say y here to enable Rave SP EEPROM support.
+config NVMEM_RCAR_EFUSE
+ tristate "Renesas R-Car Gen4 E-FUSE support"
+ depends on (ARCH_RENESAS && ARM64) || COMPILE_TEST
+ depends on NVMEM
+ help
+ Enable support for reading the fuses in the E-FUSE or OTP
+ non-volatile memory block on Renesas R-Car Gen4 SoCs.
+
+ This driver can also be built as a module. If so, the module
+ will be called nvmem-rcar-efuse.
+
config NVMEM_RMEM
tristate "Reserved Memory Based Driver Support"
depends on HAS_IOMEM
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index cdd01fbf1313..5b77bbb6488b 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -52,6 +52,8 @@ obj-$(CONFIG_NVMEM_QCOM_SEC_QFPROM) += nvmem_sec_qfprom.o
nvmem_sec_qfprom-y := sec-qfprom.o
obj-$(CONFIG_NVMEM_RAVE_SP_EEPROM) += nvmem-rave-sp-eeprom.o
nvmem-rave-sp-eeprom-y := rave-sp-eeprom.o
+obj-$(CONFIG_NVMEM_RCAR_EFUSE) += nvmem-rcar-efuse.o
+nvmem-rcar-efuse-y := rcar-efuse.o
obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o
nvmem-rmem-y := rmem.o
obj-$(CONFIG_NVMEM_ROCKCHIP_EFUSE) += nvmem_rockchip_efuse.o
diff --git a/drivers/nvmem/rcar-efuse.c b/drivers/nvmem/rcar-efuse.c
new file mode 100644
index 000000000000..f24bdb9cb5a7
--- /dev/null
+++ b/drivers/nvmem/rcar-efuse.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Renesas R-Car E-FUSE/OTP Driver
+ *
+ * Copyright (C) 2024 Glider bv
+ */
+
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/nvmem-provider.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+
+struct rcar_fuse {
+ struct nvmem_keepout keepouts[2];
+ struct nvmem_device *nvmem;
+ struct device *dev;
+ void __iomem *base;
+};
+
+struct rcar_fuse_data {
+ unsigned int bank; /* 0: PFC + E-FUSE, 1: OPT_MEM + E-FUSE */
+ unsigned int start; /* inclusive */
+ unsigned int end; /* exclusive */
+};
+
+static int rcar_fuse_reg_read(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct rcar_fuse *fuse = priv;
+ int ret;
+
+ ret = pm_runtime_resume_and_get(fuse->dev);
+ if (ret < 0)
+ return ret;
+
+ __ioread32_copy(val, fuse->base + offset, bytes / 4);
+
+ pm_runtime_put(fuse->dev);
+
+ return 0;
+}
+
+static int rcar_fuse_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct rcar_fuse_data *data = device_get_match_data(dev);
+ struct nvmem_config config = {
+ .dev = dev,
+ .name = "rcar-fuse",
+ .id = NVMEM_DEVID_NONE,
+ .owner = THIS_MODULE,
+ .type = NVMEM_TYPE_OTP,
+ .read_only = true,
+ .root_only = true,
+ .reg_read = rcar_fuse_reg_read,
+ .word_size = 4,
+ .stride = 4,
+ };
+ struct rcar_fuse *fuse;
+ struct resource *res;
+ int ret;
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret < 0)
+ return ret;
+
+ fuse = devm_kzalloc(dev, sizeof(*fuse), GFP_KERNEL);
+ if (!fuse)
+ return -ENOMEM;
+
+ fuse->base = devm_platform_get_and_ioremap_resource(pdev, data->bank,
+ &res);
+ if (IS_ERR(fuse->base))
+ return PTR_ERR(fuse->base);
+
+ fuse->dev = dev;
+ fuse->keepouts[0].start = 0;
+ fuse->keepouts[0].end = data->start;
+ fuse->keepouts[1].start = data->end;
+ fuse->keepouts[1].end = resource_size(res);
+
+ config.keepout = fuse->keepouts;
+ config.nkeepout = ARRAY_SIZE(fuse->keepouts);
+ config.size = resource_size(res);
+ config.priv = fuse;
+
+ fuse->nvmem = devm_nvmem_register(dev, &config);
+ if (IS_ERR(fuse->nvmem))
+ return dev_err_probe(dev, PTR_ERR(fuse->nvmem),
+ "Failed to register NVMEM device\n");
+
+ return 0;
+}
+
+static const struct rcar_fuse_data rcar_fuse_v3u = {
+ .bank = 0,
+ .start = 0x0c0,
+ .end = 0x0e8,
+};
+
+static const struct rcar_fuse_data rcar_fuse_s4 = {
+ .bank = 0,
+ .start = 0x0c0,
+ .end = 0x14c,
+};
+
+static const struct rcar_fuse_data rcar_fuse_v4h = {
+ .bank = 1,
+ .start = 0x100,
+ .end = 0x1a0,
+};
+
+static const struct rcar_fuse_data rcar_fuse_v4m = {
+ .bank = 1,
+ .start = 0x100,
+ .end = 0x110,
+};
+
+static const struct of_device_id rcar_fuse_match[] = {
+ { .compatible = "renesas,r8a779a0-efuse", .data = &rcar_fuse_v3u },
+ { .compatible = "renesas,r8a779f0-efuse", .data = &rcar_fuse_s4 },
+ { .compatible = "renesas,r8a779g0-otp", .data = &rcar_fuse_v4h },
+ { .compatible = "renesas,r8a779h0-otp", .data = &rcar_fuse_v4m },
+ { /* sentinel */ }
+};
+
+static struct platform_driver rcar_fuse_driver = {
+ .probe = rcar_fuse_probe,
+ .driver = {
+ .name = "rcar_fuse",
+ .of_match_table = rcar_fuse_match,
+ },
+};
+module_platform_driver(rcar_fuse_driver);
+
+MODULE_DESCRIPTION("Renesas R-Car E-FUSE/OTP driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Geert Uytterhoeven");
--
2.25.1
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