79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
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*/
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#include <linux/io.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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struct brcm_nvram {
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struct device *dev;
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void __iomem *base;
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};
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static int brcm_nvram_read(void *context, unsigned int offset, void *val,
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size_t bytes)
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{
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struct brcm_nvram *priv = context;
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u8 *dst = val;
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while (bytes--)
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*dst++ = readb(priv->base + offset++);
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return 0;
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}
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static int brcm_nvram_probe(struct platform_device *pdev)
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{
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struct nvmem_config config = {
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.name = "brcm-nvram",
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.reg_read = brcm_nvram_read,
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};
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct brcm_nvram *priv;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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config.dev = dev;
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config.priv = priv;
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config.size = resource_size(res);
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return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));
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}
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static const struct of_device_id brcm_nvram_of_match_table[] = {
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{ .compatible = "brcm,nvram", },
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{},
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};
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static struct platform_driver brcm_nvram_driver = {
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.probe = brcm_nvram_probe,
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.driver = {
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.name = "brcm_nvram",
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.of_match_table = brcm_nvram_of_match_table,
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},
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};
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static int __init brcm_nvram_init(void)
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{
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return platform_driver_register(&brcm_nvram_driver);
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}
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subsys_initcall_sync(brcm_nvram_init);
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MODULE_AUTHOR("Rafał Miłecki");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);
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