1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2010-2012 Broadcom. All rights reserved.
22 /* enable rng */
31 	struct hwrng rng;  member
37 static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)  in to_rng_priv()  argument
39 	return container_of(rng, struct bcm2835_rng_priv, rng);  in to_rng_priv()
45 	 * peripheral registers for CPU-native byte order.  in rng_readl()
48 		return __raw_readl(priv->base + offset);  in rng_readl()
50 		return readl(priv->base + offset);  in rng_readl()
57 		__raw_writel(val, priv->base + offset);  in rng_writel()
59 		writel(val, priv->base + offset);  in rng_writel()
62 static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,  in bcm2835_rng_read()  argument
65 	struct bcm2835_rng_priv *priv = to_rng_priv(rng);  in bcm2835_rng_read()
85 static int bcm2835_rng_init(struct hwrng *rng)  in bcm2835_rng_init()  argument
87 	struct bcm2835_rng_priv *priv = to_rng_priv(rng);  in bcm2835_rng_init()
91 	if (!IS_ERR(priv->clk)) {  in bcm2835_rng_init()
92 		ret = clk_prepare_enable(priv->clk);  in bcm2835_rng_init()
97 	if (priv->mask_interrupts) {  in bcm2835_rng_init()
104 	/* set warm-up count & enable */  in bcm2835_rng_init()
111 static void bcm2835_rng_cleanup(struct hwrng *rng)  in bcm2835_rng_cleanup()  argument
113 	struct bcm2835_rng_priv *priv = to_rng_priv(rng);  in bcm2835_rng_cleanup()
115 	/* disable rng hardware */  in bcm2835_rng_cleanup()
118 	if (!IS_ERR(priv->clk))  in bcm2835_rng_cleanup()
119 		clk_disable_unprepare(priv->clk);  in bcm2835_rng_cleanup()
131 	{ .compatible = "brcm,bcm2835-rng"},
132 	{ .compatible = "brcm,bcm-nsp-rng", .data = &nsp_rng_of_data },
133 	{ .compatible = "brcm,bcm5301x-rng", .data = &nsp_rng_of_data },
134 	{ .compatible = "brcm,bcm6368-rng"},
141 	struct device *dev = &pdev->dev;  in bcm2835_rng_probe()
148 		return -ENOMEM;  in bcm2835_rng_probe()
153 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in bcm2835_rng_probe()
154 	if (IS_ERR(priv->base))  in bcm2835_rng_probe()
155 		return PTR_ERR(priv->base);  in bcm2835_rng_probe()
158 	priv->clk = devm_clk_get(dev, NULL);  in bcm2835_rng_probe()
159 	if (PTR_ERR(priv->clk) == -EPROBE_DEFER)  in bcm2835_rng_probe()
160 		return -EPROBE_DEFER;  in bcm2835_rng_probe()
162 	priv->rng.name = pdev->name;  in bcm2835_rng_probe()
163 	priv->rng.init = bcm2835_rng_init;  in bcm2835_rng_probe()
164 	priv->rng.read = bcm2835_rng_read;  in bcm2835_rng_probe()
165 	priv->rng.cleanup = bcm2835_rng_cleanup;  in bcm2835_rng_probe()
168 		rng_id = of_match_node(bcm2835_rng_of_match, dev->of_node);  in bcm2835_rng_probe()
170 			return -EINVAL;  in bcm2835_rng_probe()
172 		/* Check for rng init function, execute it */  in bcm2835_rng_probe()
173 		of_data = rng_id->data;  in bcm2835_rng_probe()
175 			priv->mask_interrupts = of_data->mask_interrupts;  in bcm2835_rng_probe()
179 	err = devm_hwrng_register(dev, &priv->rng);  in bcm2835_rng_probe()
191 	{ .name = "bcm2835-rng" },
192 	{ .name = "bcm63xx-rng" },
199 		.name = "bcm2835-rng",
208 MODULE_DESCRIPTION("BCM2835 Random Number Generator (RNG) driver");