1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
26 	int (*read)(struct hwrng *rng, void *buf, size_t max, bool wait);
31 	struct hwrng rng;  member
35 static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)  in meson_rng_read()  argument
38 			container_of(rng, struct meson_rng_data, rng);  in meson_rng_read()
40 	*(u32 *)buf = readl_relaxed(data->base + RNG_DATA);  in meson_rng_read()
54 		return -EBUSY;  in meson_rng_wait_status()
59 static int meson_s4_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)  in meson_s4_rng_read()  argument
62 			container_of(rng, struct meson_rng_data, rng);  in meson_s4_rng_read()
64 	void __iomem *cfg_addr = data->base + RNG_S4_CFG;  in meson_s4_rng_read()
71 		dev_err(data->dev, "Seed isn't ready, try again\n");  in meson_s4_rng_read()
77 		dev_err(data->dev, "Can't get random number, try again\n");  in meson_s4_rng_read()
81 	*(u32 *)buf = readl_relaxed(data->base + RNG_S4_DATA);  in meson_s4_rng_read()
88 	struct device *dev = &pdev->dev;  in meson_rng_probe()
95 		return -ENOMEM;  in meson_rng_probe()
97 	priv = device_get_match_data(&pdev->dev);  in meson_rng_probe()
99 		return -ENODEV;  in meson_rng_probe()
101 	data->base = devm_platform_ioremap_resource(pdev, 0);  in meson_rng_probe()
102 	if (IS_ERR(data->base))  in meson_rng_probe()
103 		return PTR_ERR(data->base);  in meson_rng_probe()
110 	data->rng.name = pdev->name;  in meson_rng_probe()
111 	data->rng.read = priv->read;  in meson_rng_probe()
113 	data->dev = &pdev->dev;  in meson_rng_probe()
115 	return devm_hwrng_register(dev, &data->rng);  in meson_rng_probe()
128 		.compatible = "amlogic,meson-rng",
132 		.compatible = "amlogic,meson-s4-rng",
142 		.name = "meson-rng",
149 MODULE_DESCRIPTION("Meson H/W Random Number Generator driver");