1 // SPDX-License-Identifier: GPL-2.0-only
27 MODULE_PARM_DESC(seed_sel, "Auto reload seed. 0, use LFSR(default); 1, use ring oscillator.");
38 	u32 seed;  in hisi_rng_init()  local
40 	/* get a random number as initial seed */  in hisi_rng_init()
41 	get_random_bytes(&seed, sizeof(seed));  in hisi_rng_init()
43 	writel_relaxed(seed, hrng->base + RNG_SEED);  in hisi_rng_init()
46 	 * The seed is reload periodically, there are two choice  in hisi_rng_init()
47 	 * of seeds, default seed using the value from LFSR, or  in hisi_rng_init()
48 	 * will use seed generated by ring oscillator.  in hisi_rng_init()
53 	writel_relaxed(val, hrng->base + RNG_CTRL);  in hisi_rng_init()
61 	writel_relaxed(0, hrng->base + RNG_CTRL);  in hisi_rng_cleanup()
69 	*data = readl_relaxed(hrng->base + RNG_RAN_NUM);  in hisi_rng_read()
78 	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);  in hisi_rng_probe()
80 		return -ENOMEM;  in hisi_rng_probe()
84 	rng->base = devm_platform_ioremap_resource(pdev, 0);  in hisi_rng_probe()
85 	if (IS_ERR(rng->base))  in hisi_rng_probe()
86 		return PTR_ERR(rng->base);  in hisi_rng_probe()
88 	rng->rng.name = pdev->name;  in hisi_rng_probe()
89 	rng->rng.init = hisi_rng_init;  in hisi_rng_probe()
90 	rng->rng.cleanup = hisi_rng_cleanup;  in hisi_rng_probe()
91 	rng->rng.read = hisi_rng_read;  in hisi_rng_probe()
93 	ret = devm_hwrng_register(&pdev->dev, &rng->rng);  in hisi_rng_probe()
95 		dev_err(&pdev->dev, "failed to register hwrng\n");  in hisi_rng_probe()
103 	{ .compatible = "hisilicon,hip04-rng" },
104 	{ .compatible = "hisilicon,hip05-rng" },
112 		.name	= "hisi-rng",