136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Allwinner sunXi SoCs Security ID support.
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*
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* Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
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* Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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struct sunxi_sid_cfg {
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u32 value_offset;
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u32 size;
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};
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struct sunxi_sid {
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void __iomem *base;
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u32 value_offset;
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};
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static int sunxi_sid_read(void *context, unsigned int offset,
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void *val, size_t bytes)
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{
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struct sunxi_sid *sid = context;
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memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);
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return 0;
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}
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static int sunxi_sid_probe(struct platform_device *pdev)
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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 nvmem_config *nvmem_cfg;
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struct nvmem_device *nvmem;
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struct sunxi_sid *sid;
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int size;
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char *randomness;
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const struct sunxi_sid_cfg *cfg;
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sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
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if (!sid)
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return -ENOMEM;
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cfg = of_device_get_match_data(dev);
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if (!cfg)
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return -EINVAL;
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sid->value_offset = cfg->value_offset;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sid->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(sid->base))
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return PTR_ERR(sid->base);
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size = cfg->size;
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nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
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if (!nvmem_cfg)
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return -ENOMEM;
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nvmem_cfg->dev = dev;
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nvmem_cfg->name = "sunxi-sid";
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nvmem_cfg->read_only = true;
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nvmem_cfg->size = cfg->size;
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nvmem_cfg->word_size = 1;
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nvmem_cfg->stride = 4;
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nvmem_cfg->priv = sid;
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nvmem_cfg->reg_read = sunxi_sid_read;
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nvmem = nvmem_register(nvmem_cfg);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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randomness = kzalloc(size, GFP_KERNEL);
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if (!randomness)
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return -ENOMEM;
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nvmem_cfg->reg_read(sid, 0, randomness, size);
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add_device_randomness(randomness, size);
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kfree(randomness);
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platform_set_drvdata(pdev, nvmem);
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return 0;
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}
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static int sunxi_sid_remove(struct platform_device *pdev)
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{
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struct nvmem_device *nvmem = platform_get_drvdata(pdev);
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return nvmem_unregister(nvmem);
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}
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static const struct sunxi_sid_cfg sun50iw9p1_cfg = {
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.value_offset = 0x200,
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.size = 0x100,
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};
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static const struct sunxi_sid_cfg sun50iw11p1_cfg = {
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.value_offset = 0x200,
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.size = 0x80,
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};
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static const struct of_device_id sunxi_sid_of_match[] = {
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{ .compatible = "allwinner,sun50iw9p1-sid", .data = &sun50iw9p1_cfg },
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{ .compatible = "allwinner,sun50iw10p1-sid", .data = &sun50iw9p1_cfg },
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{ .compatible = "allwinner,sun50iw11p1-sid", .data = &sun50iw11p1_cfg },
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{ .compatible = "allwinner,sun8iw21p1-sid", .data = &sun50iw9p1_cfg},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
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static struct platform_driver sunxi_sid_driver = {
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.probe = sunxi_sid_probe,
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.remove = sunxi_sid_remove,
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.driver = {
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.name = "eeprom-sunxi-sid",
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.of_match_table = sunxi_sid_of_match,
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},
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};
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module_platform_driver_paralell(sunxi_sid_driver);
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MODULE_AUTHOR("Oliver Schinagl <oliver@schinagl.nl>");
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MODULE_DESCRIPTION("Allwinner sunxi security id driver");
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MODULE_LICENSE("GPL");
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