1 // SPDX-License-Identifier: GPL-2.0
18 /* RNG register offsets */
36 	struct hwrng rng;  member
39 static int ingenic_rng_init(struct hwrng *rng)  in ingenic_rng_init()  argument
41 	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);  in ingenic_rng_init()
43 	writel(ERNG_ENABLE, priv->base + RNG_REG_ERNG_OFFSET);  in ingenic_rng_init()
48 static void ingenic_rng_cleanup(struct hwrng *rng)  in ingenic_rng_cleanup()  argument
50 	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);  in ingenic_rng_cleanup()
52 	writel(0, priv->base + RNG_REG_ERNG_OFFSET);  in ingenic_rng_cleanup()
55 static int ingenic_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)  in ingenic_rng_read()  argument
57 	struct ingenic_rng *priv = container_of(rng, struct ingenic_rng, rng);  in ingenic_rng_read()
62 	if (priv->version >= ID_X1000) {  in ingenic_rng_read()
63 		ret = readl_poll_timeout(priv->base + RNG_REG_ERNG_OFFSET, status,  in ingenic_rng_read()
65 		if (ret == -ETIMEDOUT) {  in ingenic_rng_read()
66 			pr_err("%s: Wait for RNG data ready timeout\n", __func__);  in ingenic_rng_read()
71 		 * A delay is required so that the current RNG data is not bit shifted  in ingenic_rng_read()
72 		 * version of previous RNG data which could happen if random data is  in ingenic_rng_read()
78 	*data = readl(priv->base + RNG_REG_RNG_OFFSET);  in ingenic_rng_read()
88 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in ingenic_rng_probe()
90 		return -ENOMEM;  in ingenic_rng_probe()
92 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in ingenic_rng_probe()
93 	if (IS_ERR(priv->base)) {  in ingenic_rng_probe()
94 		pr_err("%s: Failed to map RNG registers\n", __func__);  in ingenic_rng_probe()
95 		return PTR_ERR(priv->base);  in ingenic_rng_probe()
98 	priv->version = (enum ingenic_rng_version)of_device_get_match_data(&pdev->dev);  in ingenic_rng_probe()
100 	priv->rng.name = pdev->name;  in ingenic_rng_probe()
101 	priv->rng.init = ingenic_rng_init;  in ingenic_rng_probe()
102 	priv->rng.cleanup = ingenic_rng_cleanup;  in ingenic_rng_probe()
103 	priv->rng.read = ingenic_rng_read;  in ingenic_rng_probe()
105 	ret = hwrng_register(&priv->rng);  in ingenic_rng_probe()
107 		dev_err(&pdev->dev, "Failed to register hwrng\n");  in ingenic_rng_probe()
113 	dev_info(&pdev->dev, "Ingenic RNG driver registered\n");  in ingenic_rng_probe()
121 	hwrng_unregister(&priv->rng);  in ingenic_rng_remove()
123 	writel(0, priv->base + RNG_REG_ERNG_OFFSET);  in ingenic_rng_remove()
129 	{ .compatible = "ingenic,jz4780-rng", .data = (void *) ID_JZ4780 },
130 	{ .compatible = "ingenic,x1000-rng", .data = (void *) ID_X1000 },
139 		.name	= "ingenic-rng",