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path: root/drivers/nvmem/layerscape-sfp.c
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Diffstat (limited to 'drivers/nvmem/layerscape-sfp.c')
-rw-r--r--drivers/nvmem/layerscape-sfp.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/nvmem/layerscape-sfp.c b/drivers/nvmem/layerscape-sfp.c
new file mode 100644
index 0000000000..e2b4245619
--- /dev/null
+++ b/drivers/nvmem/layerscape-sfp.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Layerscape SFP driver
+ *
+ * Copyright (c) 2022 Michael Walle <michael@walle.cc>
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define LAYERSCAPE_SFP_OTP_OFFSET 0x0200
+
+struct layerscape_sfp_priv {
+ struct regmap *regmap;
+};
+
+struct layerscape_sfp_data {
+ int size;
+ enum regmap_endian endian;
+};
+
+static int layerscape_sfp_read(void *context, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct layerscape_sfp_priv *priv = context;
+
+ return regmap_bulk_read(priv->regmap,
+ LAYERSCAPE_SFP_OTP_OFFSET + offset, val,
+ bytes / 4);
+}
+
+static struct nvmem_config layerscape_sfp_nvmem_config = {
+ .name = "fsl-sfp",
+ .reg_read = layerscape_sfp_read,
+ .word_size = 4,
+ .stride = 4,
+};
+
+static int layerscape_sfp_probe(struct platform_device *pdev)
+{
+ const struct layerscape_sfp_data *data;
+ struct layerscape_sfp_priv *priv;
+ struct nvmem_device *nvmem;
+ struct regmap_config config = { 0 };
+ void __iomem *base;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ data = device_get_match_data(&pdev->dev);
+ config.reg_bits = 32;
+ config.reg_stride = 4;
+ config.val_bits = 32;
+ config.val_format_endian = data->endian;
+ config.max_register = LAYERSCAPE_SFP_OTP_OFFSET + data->size - 4;
+ priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, &config);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
+
+ layerscape_sfp_nvmem_config.size = data->size;
+ layerscape_sfp_nvmem_config.dev = &pdev->dev;
+ layerscape_sfp_nvmem_config.priv = priv;
+
+ nvmem = devm_nvmem_register(&pdev->dev, &layerscape_sfp_nvmem_config);
+
+ return PTR_ERR_OR_ZERO(nvmem);
+}
+
+static const struct layerscape_sfp_data ls1021a_data = {
+ .size = 0x88,
+ .endian = REGMAP_ENDIAN_BIG,
+};
+
+static const struct layerscape_sfp_data ls1028a_data = {
+ .size = 0x88,
+ .endian = REGMAP_ENDIAN_LITTLE,
+};
+
+static const struct of_device_id layerscape_sfp_dt_ids[] = {
+ { .compatible = "fsl,ls1021a-sfp", .data = &ls1021a_data },
+ { .compatible = "fsl,ls1028a-sfp", .data = &ls1028a_data },
+ {},
+};
+MODULE_DEVICE_TABLE(of, layerscape_sfp_dt_ids);
+
+static struct platform_driver layerscape_sfp_driver = {
+ .probe = layerscape_sfp_probe,
+ .driver = {
+ .name = "layerscape_sfp",
+ .of_match_table = layerscape_sfp_dt_ids,
+ },
+};
+module_platform_driver(layerscape_sfp_driver);
+
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_DESCRIPTION("Layerscape Security Fuse Processor driver");
+MODULE_LICENSE("GPL");