79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* drivers/char/hw_random/ixp4xx-rng.c
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*
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* RNG driver for Intel IXP4xx family of NPUs
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2005 (c) MontaVista Software, Inc.
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*
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* Fixes by Michael Buesch
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/hw_random.h>
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#include <linux/of.h>
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#include <linux/soc/ixp4xx/cpu.h>
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#include <asm/io.h>
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static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer)
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{
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void __iomem * rng_base = (void __iomem *)rng->priv;
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*buffer = __raw_readl(rng_base);
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return 4;
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}
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static struct hwrng ixp4xx_rng_ops = {
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.name = "ixp4xx",
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.data_read = ixp4xx_rng_data_read,
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};
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static int ixp4xx_rng_probe(struct platform_device *pdev)
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{
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void __iomem * rng_base;
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struct device *dev = &pdev->dev;
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struct resource *res;
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if (!cpu_is_ixp46x()) /* includes IXP455 */
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return -ENOSYS;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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rng_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(rng_base))
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return PTR_ERR(rng_base);
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ixp4xx_rng_ops.priv = (unsigned long)rng_base;
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return devm_hwrng_register(dev, &ixp4xx_rng_ops);
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}
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static const struct of_device_id ixp4xx_rng_of_match[] = {
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{
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.compatible = "intel,ixp46x-rng",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, ixp4xx_rng_of_match);
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static struct platform_driver ixp4xx_rng_driver = {
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.driver = {
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.name = "ixp4xx-hwrandom",
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.of_match_table = ixp4xx_rng_of_match,
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},
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.probe = ixp4xx_rng_probe,
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};
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module_platform_driver(ixp4xx_rng_driver);
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MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
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MODULE_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x");
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MODULE_LICENSE("GPL");
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