1 // SPDX-License-Identifier: GPL-2.0-only
3  * PIC32 RNG driver
30 	struct hwrng	rng;  member
40 static int pic32_rng_init(struct hwrng *rng)  in pic32_rng_init()  argument
42 	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);  in pic32_rng_init()
45 	writel(TRNGEN | TRNGMOD, priv->base + RNGCON);  in pic32_rng_init()
49 static int pic32_rng_read(struct hwrng *rng, void *buf, size_t max,  in pic32_rng_read()  argument
52 	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);  in pic32_rng_read()
58 		t = readl(priv->base + RNGRCNT) & RCNT_MASK;  in pic32_rng_read()
61 			*data = ((u64)readl(priv->base + RNGSEED2) << 32) +  in pic32_rng_read()
62 				readl(priv->base + RNGSEED1);  in pic32_rng_read()
65 	} while (wait && --timeout);  in pic32_rng_read()
67 	return -EIO;  in pic32_rng_read()
70 static void pic32_rng_cleanup(struct hwrng *rng)  in pic32_rng_cleanup()  argument
72 	struct pic32_rng *priv = container_of(rng, struct pic32_rng, rng);  in pic32_rng_cleanup()
74 	writel(0, priv->base + RNGCON);  in pic32_rng_cleanup()
82 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in pic32_rng_probe()
84 		return -ENOMEM;  in pic32_rng_probe()
86 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in pic32_rng_probe()
87 	if (IS_ERR(priv->base))  in pic32_rng_probe()
88 		return PTR_ERR(priv->base);  in pic32_rng_probe()
90 	clk = devm_clk_get_enabled(&pdev->dev, NULL);  in pic32_rng_probe()
94 	priv->rng.name = pdev->name;  in pic32_rng_probe()
95 	priv->rng.init = pic32_rng_init;  in pic32_rng_probe()
96 	priv->rng.read = pic32_rng_read;  in pic32_rng_probe()
97 	priv->rng.cleanup = pic32_rng_cleanup;  in pic32_rng_probe()
99 	return devm_hwrng_register(&pdev->dev, &priv->rng);  in pic32_rng_probe()
103 	{ .compatible	= "microchip,pic32mzda-rng", },
111 		.name	= "pic32-rng",
120 MODULE_DESCRIPTION("Microchip PIC32 RNG Driver");