25 /* trng statuses */
38 	struct xiphera_trng *trng = container_of(rng, struct xiphera_trng, rng);  in xiphera_trng_read()  local
43 		if (readl(trng->mem + STATUS_REG) == TRNG_NEW_RAND_AVAILABLE) {  in xiphera_trng_read()
44 			*(u32 *)buf = readl(trng->mem + RAND_REG);  in xiphera_trng_read()
46 			 * Inform the trng of the read  in xiphera_trng_read()
49 			writel(HOST_TO_TRNG_READ, trng->mem + CONTROL_REG);  in xiphera_trng_read()
50 			writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);  in xiphera_trng_read()
64 	struct xiphera_trng *trng;  in xiphera_trng_probe()  local
67 	trng = devm_kzalloc(dev, sizeof(*trng), GFP_KERNEL);  in xiphera_trng_probe()
68 	if (!trng)  in xiphera_trng_probe()
71 	trng->mem = devm_platform_ioremap_resource(pdev, 0);  in xiphera_trng_probe()
72 	if (IS_ERR(trng->mem))  in xiphera_trng_probe()
73 		return PTR_ERR(trng->mem);  in xiphera_trng_probe()
76 	 * the trng needs to be reset first which might not happen in time,  in xiphera_trng_probe()
79 	writel(HOST_TO_TRNG_RESET, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
82 	if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {  in xiphera_trng_probe()
84 		 * there is a small chance the trng is just not ready yet,  in xiphera_trng_probe()
88 		if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {  in xiphera_trng_probe()
89 			dev_err(dev, "failed to reset the trng ip\n");  in xiphera_trng_probe()
96 	 * for a while after zeroizing the trng  in xiphera_trng_probe()
98 	writel(HOST_TO_TRNG_RELEASE_RESET, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
99 	writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
100 	writel(HOST_TO_TRNG_ZEROIZE, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
103 	if (readl(trng->mem + STATUS_REG) != TRNG_SUCCESSFUL_STARTUP) {  in xiphera_trng_probe()
105 		if (readl(trng->mem + STATUS_REG) == TRNG_FAILED_STARTUP) {  in xiphera_trng_probe()
106 			dev_err(dev, "trng ip startup-tests failed\n");  in xiphera_trng_probe()
113 	writel(HOST_TO_TRNG_ACK_ZEROIZE, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
115 	trng->rng.name = pdev->name;  in xiphera_trng_probe()
116 	trng->rng.read = xiphera_trng_read;  in xiphera_trng_probe()
117 	trng->rng.quality = 900;  in xiphera_trng_probe()
119 	ret = devm_hwrng_register(dev, &trng->rng);  in xiphera_trng_probe()
125 	platform_set_drvdata(pdev, trng);  in xiphera_trng_probe()
131 	{ .compatible = "xiphera,xip8001b-trng", },
138 		.name = "xiphera-trng",