1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2010-2012 Broadcom. All rights reserved.
22 /* enable rng */
31 	struct hwrng rng;  member
38 static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)  in to_rng_priv()  argument
40 	return container_of(rng, struct bcm2835_rng_priv, rng);  in to_rng_priv()
46 	 * peripheral registers for CPU-native byte order.  in rng_readl()
49 		return __raw_readl(priv->base + offset);  in rng_readl()
51 		return readl(priv->base + offset);  in rng_readl()
58 		__raw_writel(val, priv->base + offset);  in rng_writel()
60 		writel(val, priv->base + offset);  in rng_writel()
63 static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,  in bcm2835_rng_read()  argument
66 	struct bcm2835_rng_priv *priv = to_rng_priv(rng);  in bcm2835_rng_read()
73 		hwrng_yield(rng);  in bcm2835_rng_read()
86 static int bcm2835_rng_init(struct hwrng *rng)  in bcm2835_rng_init()  argument
88 	struct bcm2835_rng_priv *priv = to_rng_priv(rng);  in bcm2835_rng_init()
92 	ret = clk_prepare_enable(priv->clk);  in bcm2835_rng_init()
96 	ret = reset_control_reset(priv->reset);  in bcm2835_rng_init()
98 		clk_disable_unprepare(priv->clk);  in bcm2835_rng_init()
102 	if (priv->mask_interrupts) {  in bcm2835_rng_init()
109 	/* set warm-up count & enable */  in bcm2835_rng_init()
116 static void bcm2835_rng_cleanup(struct hwrng *rng)  in bcm2835_rng_cleanup()  argument
118 	struct bcm2835_rng_priv *priv = to_rng_priv(rng);  in bcm2835_rng_cleanup()
120 	/* disable rng hardware */  in bcm2835_rng_cleanup()
123 	clk_disable_unprepare(priv->clk);  in bcm2835_rng_cleanup()
135 	{ .compatible = "brcm,bcm2835-rng"},
136 	{ .compatible = "brcm,bcm-nsp-rng", .data = &nsp_rng_of_data },
137 	{ .compatible = "brcm,bcm5301x-rng", .data = &nsp_rng_of_data },
138 	{ .compatible = "brcm,bcm6368-rng"},
145 	struct device *dev = &pdev->dev;  in bcm2835_rng_probe()
152 		return -ENOMEM;  in bcm2835_rng_probe()
155 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in bcm2835_rng_probe()
156 	if (IS_ERR(priv->base))  in bcm2835_rng_probe()
157 		return PTR_ERR(priv->base);  in bcm2835_rng_probe()
160 	priv->clk = devm_clk_get_optional(dev, NULL);  in bcm2835_rng_probe()
161 	if (IS_ERR(priv->clk))  in bcm2835_rng_probe()
162 		return PTR_ERR(priv->clk);  in bcm2835_rng_probe()
164 	priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL);  in bcm2835_rng_probe()
165 	if (IS_ERR(priv->reset))  in bcm2835_rng_probe()
166 		return PTR_ERR(priv->reset);  in bcm2835_rng_probe()
168 	priv->rng.name = pdev->name;  in bcm2835_rng_probe()
169 	priv->rng.init = bcm2835_rng_init;  in bcm2835_rng_probe()
170 	priv->rng.read = bcm2835_rng_read;  in bcm2835_rng_probe()
171 	priv->rng.cleanup = bcm2835_rng_cleanup;  in bcm2835_rng_probe()
174 		rng_id = of_match_node(bcm2835_rng_of_match, dev->of_node);  in bcm2835_rng_probe()
176 			return -EINVAL;  in bcm2835_rng_probe()
178 		/* Check for rng init function, execute it */  in bcm2835_rng_probe()
179 		of_data = rng_id->data;  in bcm2835_rng_probe()
181 			priv->mask_interrupts = of_data->mask_interrupts;  in bcm2835_rng_probe()
185 	err = devm_hwrng_register(dev, &priv->rng);  in bcm2835_rng_probe()
197 	{ .name = "bcm2835-rng" },
198 	{ .name = "bcm63xx-rng" },
205 		.name = "bcm2835-rng",
214 MODULE_DESCRIPTION("BCM2835 Random Number Generator (RNG) driver");