Lines Matching defs:trng
25 /* trng statuses */
38 struct xiphera_trng *trng = container_of(rng, struct xiphera_trng, rng);
43 if (readl(trng->mem + STATUS_REG) == TRNG_NEW_RAND_AVAILABLE) {
44 *(u32 *)buf = readl(trng->mem + RAND_REG);
46 * Inform the trng of the read
49 writel(HOST_TO_TRNG_READ, trng->mem + CONTROL_REG);
50 writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);
64 struct xiphera_trng *trng;
68 trng = devm_kzalloc(dev, sizeof(*trng), GFP_KERNEL);
69 if (!trng)
73 trng->mem = devm_ioremap_resource(dev, res);
74 if (IS_ERR(trng->mem))
75 return PTR_ERR(trng->mem);
78 * the trng needs to be reset first which might not happen in time,
81 writel(HOST_TO_TRNG_RESET, trng->mem + CONTROL_REG);
84 if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {
86 * there is a small chance the trng is just not ready yet,
90 if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {
91 dev_err(dev, "failed to reset the trng ip\n");
98 * for a while after zeroizing the trng
100 writel(HOST_TO_TRNG_RELEASE_RESET, trng->mem + CONTROL_REG);
101 writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);
102 writel(HOST_TO_TRNG_ZEROIZE, trng->mem + CONTROL_REG);
105 if (readl(trng->mem + STATUS_REG) != TRNG_SUCCESSFUL_STARTUP) {
107 if (readl(trng->mem + STATUS_REG) == TRNG_FAILED_STARTUP) {
108 dev_err(dev, "trng ip startup-tests failed\n");
115 writel(HOST_TO_TRNG_ACK_ZEROIZE, trng->mem + CONTROL_REG);
117 trng->rng.name = pdev->name;
118 trng->rng.read = xiphera_trng_read;
119 trng->rng.quality = 900;
121 ret = devm_hwrng_register(dev, &trng->rng);
127 platform_set_drvdata(pdev, trng);
133 { .compatible = "xiphera,xip8001b-trng", },
140 .name = "xiphera-trng",