24 /* trng statuses */
37 	struct xiphera_trng *trng = container_of(rng, struct xiphera_trng, rng);  in xiphera_trng_read()  local
42 		if (readl(trng->mem + STATUS_REG) == TRNG_NEW_RAND_AVAILABLE) {  in xiphera_trng_read()
43 			*(u32 *)buf = readl(trng->mem + RAND_REG);  in xiphera_trng_read()
45 			 * Inform the trng of the read  in xiphera_trng_read()
48 			writel(HOST_TO_TRNG_READ, trng->mem + CONTROL_REG);  in xiphera_trng_read()
49 			writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);  in xiphera_trng_read()
63 	struct xiphera_trng *trng;  in xiphera_trng_probe()  local
66 	trng = devm_kzalloc(dev, sizeof(*trng), GFP_KERNEL);  in xiphera_trng_probe()
67 	if (!trng)  in xiphera_trng_probe()
70 	trng->mem = devm_platform_ioremap_resource(pdev, 0);  in xiphera_trng_probe()
71 	if (IS_ERR(trng->mem))  in xiphera_trng_probe()
72 		return PTR_ERR(trng->mem);  in xiphera_trng_probe()
75 	 * the trng needs to be reset first which might not happen in time,  in xiphera_trng_probe()
78 	writel(HOST_TO_TRNG_RESET, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
81 	if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {  in xiphera_trng_probe()
83 		 * there is a small chance the trng is just not ready yet,  in xiphera_trng_probe()
87 		if (readl(trng->mem + STATUS_REG) != TRNG_ACK_RESET) {  in xiphera_trng_probe()
88 			dev_err(dev, "failed to reset the trng ip\n");  in xiphera_trng_probe()
95 	 * for a while after zeroizing the trng  in xiphera_trng_probe()
97 	writel(HOST_TO_TRNG_RELEASE_RESET, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
98 	writel(HOST_TO_TRNG_ENABLE, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
99 	writel(HOST_TO_TRNG_ZEROIZE, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
102 	if (readl(trng->mem + STATUS_REG) != TRNG_SUCCESSFUL_STARTUP) {  in xiphera_trng_probe()
104 		if (readl(trng->mem + STATUS_REG) == TRNG_FAILED_STARTUP) {  in xiphera_trng_probe()
105 			dev_err(dev, "trng ip startup-tests failed\n");  in xiphera_trng_probe()
112 	writel(HOST_TO_TRNG_ACK_ZEROIZE, trng->mem + CONTROL_REG);  in xiphera_trng_probe()
114 	trng->rng.name = pdev->name;  in xiphera_trng_probe()
115 	trng->rng.read = xiphera_trng_read;  in xiphera_trng_probe()
116 	trng->rng.quality = 900;  in xiphera_trng_probe()
118 	ret = devm_hwrng_register(dev, &trng->rng);  in xiphera_trng_probe()
128 	{ .compatible = "xiphera,xip8001b-trng", },
135 		.name = "xiphera-trng",