1 // SPDX-License-Identifier: GPL-2.0
19 /* DTRNG register offsets */
40 	ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);  in ingenic_trng_init()
42 	writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);  in ingenic_trng_init()
52 	ctrl = readl(trng->base + TRNG_REG_CFG_OFFSET);  in ingenic_trng_cleanup()
54 	writel(ctrl, trng->base + TRNG_REG_CFG_OFFSET);  in ingenic_trng_cleanup()
64 	ret = readl_poll_timeout(trng->base + TRNG_REG_STATUS_OFFSET, status,  in ingenic_trng_read()
66 	if (ret == -ETIMEDOUT) {  in ingenic_trng_read()
67 		pr_err("%s: Wait for DTRNG data ready timeout\n", __func__);  in ingenic_trng_read()
71 	*data = readl(trng->base + TRNG_REG_RANDOMNUM_OFFSET);  in ingenic_trng_read()
82 	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);  in ingenic_trng_probe()
84 		return -ENOMEM;  in ingenic_trng_probe()
86 	trng->base = devm_platform_ioremap_resource(pdev, 0);  in ingenic_trng_probe()
87 	if (IS_ERR(trng->base))  in ingenic_trng_probe()
88 		return dev_err_probe(&pdev->dev, PTR_ERR(trng->base),  in ingenic_trng_probe()
89 				     "%s: Failed to map DTRNG registers\n", __func__);  in ingenic_trng_probe()
91 	clk = devm_clk_get_enabled(&pdev->dev, NULL);  in ingenic_trng_probe()
93 		return dev_err_probe(&pdev->dev, PTR_ERR(clk),  in ingenic_trng_probe()
94 				     "%s: Cannot get and enable DTRNG clock\n", __func__);  in ingenic_trng_probe()
96 	trng->rng.name = pdev->name;  in ingenic_trng_probe()
97 	trng->rng.init = ingenic_trng_init;  in ingenic_trng_probe()
98 	trng->rng.cleanup = ingenic_trng_cleanup;  in ingenic_trng_probe()
99 	trng->rng.read = ingenic_trng_read;  in ingenic_trng_probe()
101 	ret = devm_hwrng_register(&pdev->dev, &trng->rng);  in ingenic_trng_probe()
103 		return dev_err_probe(&pdev->dev, ret, "Failed to register hwrng\n");  in ingenic_trng_probe()
107 	dev_info(&pdev->dev, "Ingenic DTRNG driver registered\n");  in ingenic_trng_probe()
112 	{ .compatible = "ingenic,x1830-dtrng" },
120 		.name	= "ingenic-trng",