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Diffstat (limited to 'drivers/nvmem/qoriq-efuse.c')
-rw-r--r--drivers/nvmem/qoriq-efuse.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/nvmem/qoriq-efuse.c b/drivers/nvmem/qoriq-efuse.c
new file mode 100644
index 0000000000..e7fd04d6dd
--- /dev/null
+++ b/drivers/nvmem/qoriq-efuse.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Westermo Network Technologies AB
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/nvmem-provider.h>
+#include <linux/platform_device.h>
+
+struct qoriq_efuse_priv {
+ void __iomem *base;
+};
+
+static int qoriq_efuse_read(void *context, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct qoriq_efuse_priv *priv = context;
+
+ /* .stride = 4 so offset is guaranteed to be aligned */
+ __ioread32_copy(val, priv->base + offset, bytes / 4);
+
+ /* Ignore trailing bytes (there shouldn't be any) */
+
+ return 0;
+}
+
+static int qoriq_efuse_probe(struct platform_device *pdev)
+{
+ struct nvmem_config config = {
+ .dev = &pdev->dev,
+ .read_only = true,
+ .reg_read = qoriq_efuse_read,
+ .stride = sizeof(u32),
+ .word_size = sizeof(u32),
+ .name = "qoriq_efuse_read",
+ .id = NVMEM_DEVID_AUTO,
+ .root_only = true,
+ };
+ struct qoriq_efuse_priv *priv;
+ struct nvmem_device *nvmem;
+ struct resource *res;
+
+ priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ config.size = resource_size(res);
+ config.priv = priv;
+ nvmem = devm_nvmem_register(config.dev, &config);
+
+ return PTR_ERR_OR_ZERO(nvmem);
+}
+
+static const struct of_device_id qoriq_efuse_of_match[] = {
+ { .compatible = "fsl,t1023-sfp", },
+ {/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, qoriq_efuse_of_match);
+
+static struct platform_driver qoriq_efuse_driver = {
+ .probe = qoriq_efuse_probe,
+ .driver = {
+ .name = "qoriq-efuse",
+ .of_match_table = qoriq_efuse_of_match,
+ },
+};
+module_platform_driver(qoriq_efuse_driver);
+
+MODULE_AUTHOR("Richard Alpe <richard.alpe@bit42.se>");
+MODULE_DESCRIPTION("NXP QorIQ Security Fuse Processor (SFP) Reader");
+MODULE_LICENSE("GPL");