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Message-ID: <dce51c4706ca4961a2ade23756aab750803b12ec.1756219848.git.dan.carpenter@linaro.org>
Date: Tue, 26 Aug 2025 19:38:10 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Srinivas Kandagatla <srini@...nel.org>
Cc: NXP S32 Linux Team <s32@....com>, linaro-s32@...aro.org,
linux-kernel@...r.kernel.org,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH V2 2/3] nvmem: s32g-ocotp: Add driver for S32G OCOTP
From: Ciprian Costea <ciprianmarian.costea@....com>
Provide access to the On Chip One-Time Programmable Controller (OCOTP)
pages on the NXP S32G platform.
Signed-off-by: Ciprian Costea <ciprianmarian.costea@....com>
Co-developed-by: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
Co-developed-by: Larisa Grigore <larisa.grigore@....com>
Signed-off-by: Larisa Grigore <larisa.grigore@....com>
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
v2: Add S-o-b tags for Ghennadi and Larisa.
Use keepouts instead of the s32g_map[] table. This allows a bunch
of code to be deleted.
Version 1 only let one word (S32G_OCOTP_WORD_SIZE or 4) to be read
at a time, but now the driver allows larger reads. Set the
.word_size in s32g_ocotp_nvmem_config to be 4 instead.
Krzysztof asked for some changes in the probe() function but that
code was deleted instead.
drivers/nvmem/Kconfig | 10 +++
drivers/nvmem/Makefile | 2 +
drivers/nvmem/s32g-ocotp-nvmem.c | 101 +++++++++++++++++++++++++++++++
3 files changed, 113 insertions(+)
create mode 100644 drivers/nvmem/s32g-ocotp-nvmem.c
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 0bdd86d74f62..55016f803492 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -240,6 +240,16 @@ config NVMEM_NINTENDO_OTP
This driver can also be built as a module. If so, the module
will be called nvmem-nintendo-otp.
+config NVMEM_S32G_OCOTP
+ tristate "S32G SoC OCOTP support"
+ depends on ARCH_S32
+ help
+ This is a driver for the 'OCOTP' peripheral available on S32G
+ platforms.
+
+ If you say Y here, you will get support for the One Time
+ Programmable memory pages.
+
config NVMEM_QCOM_QFPROM
tristate "QCOM QFPROM Support"
depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 84fef48b7ff6..e01bb4ad612a 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -79,6 +79,8 @@ obj-$(CONFIG_NVMEM_SUNPLUS_OCOTP) += nvmem_sunplus_ocotp.o
nvmem_sunplus_ocotp-y := sunplus-ocotp.o
obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o
nvmem_sunxi_sid-y := sunxi_sid.o
+obj-$(CONFIG_NVMEM_S32G_OCOTP) += nvmem-s32g-ocotp-nvmem.o
+nvmem-s32g-ocotp-nvmem-y := s32g-ocotp-nvmem.o
obj-$(CONFIG_NVMEM_U_BOOT_ENV) += nvmem_u-boot-env.o
nvmem_u-boot-env-y := u-boot-env.o
obj-$(CONFIG_NVMEM_UNIPHIER_EFUSE) += nvmem-uniphier-efuse.o
diff --git a/drivers/nvmem/s32g-ocotp-nvmem.c b/drivers/nvmem/s32g-ocotp-nvmem.c
new file mode 100644
index 000000000000..dce092c0fc52
--- /dev/null
+++ b/drivers/nvmem/s32g-ocotp-nvmem.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2023-2025 NXP
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+struct s32g_ocotp_priv {
+ struct device *dev;
+ void __iomem *base;
+};
+
+static int s32g_ocotp_read(void *context, unsigned int offset,
+ void *val, size_t bytes)
+{
+ struct s32g_ocotp_priv *s32g_data = context;
+ u32 *dst = val;
+
+ while (bytes >= sizeof(u32)) {
+ *dst++ = ioread32(s32g_data->base + offset);
+
+ bytes -= sizeof(u32);
+ offset += sizeof(u32);
+ }
+
+ return 0;
+}
+
+static struct nvmem_keepout s32g_keepouts[] = {
+ { .start = 0, .end = 520 },
+ { .start = 540, .end = 564 },
+ { .start = 596, .end = 664 },
+ { .start = 668, .end = 676 },
+ { .start = 684, .end = 732 },
+ { .start = 744, .end = 864 },
+ { .start = 908, .end = 924 },
+ { .start = 928, .end = 936 },
+ { .start = 948, .end = 964 },
+ { .start = 968, .end = 976 },
+ { .start = 984, .end = 1012 },
+};
+
+static struct nvmem_config s32g_ocotp_nvmem_config = {
+ .name = "s32g-ocotp",
+ .add_legacy_fixed_of_cells = true,
+ .read_only = true,
+ .word_size = 4,
+ .reg_read = s32g_ocotp_read,
+ .keepout = s32g_keepouts,
+ .nkeepout = ARRAY_SIZE(s32g_keepouts),
+};
+
+static const struct of_device_id ocotp_of_match[] = {
+ { .compatible = "nxp,s32g2-ocotp" },
+ { /* sentinel */ }
+};
+
+static int s32g_ocotp_probe(struct platform_device *pdev)
+{
+ struct s32g_ocotp_priv *s32g_data;
+ struct device *dev = &pdev->dev;
+ struct nvmem_device *nvmem;
+ struct resource *res;
+
+ s32g_data = devm_kzalloc(dev, sizeof(*s32g_data), GFP_KERNEL);
+ if (!s32g_data)
+ return -ENOMEM;
+
+ s32g_data->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(s32g_data->base)) {
+ dev_err(dev, "Cannot map OCOTP device.\n");
+ return PTR_ERR(s32g_data->base);
+ }
+
+ s32g_data->dev = dev;
+ s32g_ocotp_nvmem_config.dev = dev;
+ s32g_ocotp_nvmem_config.priv = s32g_data;
+ s32g_ocotp_nvmem_config.size = resource_size(res);
+
+ nvmem = devm_nvmem_register(dev, &s32g_ocotp_nvmem_config);
+
+ return PTR_ERR_OR_ZERO(nvmem);
+}
+
+static struct platform_driver s32g_ocotp_driver = {
+ .probe = s32g_ocotp_probe,
+ .driver = {
+ .name = "s32g-ocotp",
+ .of_match_table = ocotp_of_match,
+ },
+};
+module_platform_driver(s32g_ocotp_driver);
+MODULE_AUTHOR("NXP");
+MODULE_DESCRIPTION("S32G OCOTP driver");
+MODULE_LICENSE("GPL");
--
2.47.2
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