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78 lines
1.8 KiB
78 lines
1.8 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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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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