1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2020 Silex Insight
49 	return ioread32(ba431->base + reg);  in ba431_trng_read_reg()
55 	iowrite32(val, ba431->base + reg);  in ba431_trng_write_reg()
89 		dev_err(ba431->dev, "reset failed (state: %d)\n",  in ba431_trng_reset()
91 		return -ETIMEDOUT;  in ba431_trng_reset()
94 	dev_info(ba431->dev, "reset done\n");  in ba431_trng_reset()
104 	atomic_set(&ba431->reset_pending, 0);  in ba431_trng_reset_work()
109 	if (atomic_cmpxchg(&ba431->reset_pending, 0, 1))  in ba431_trng_schedule_reset()
112 	schedule_work(&ba431->reset_work);  in ba431_trng_schedule_reset()
141 			max -= sizeof(*data);  in ba431_trng_read()
142 		} while (--i && (max > 0));  in ba431_trng_read()
145 			n -= (level - i);  in ba431_trng_read()
152 	return (n || !wait) ? n : -EIO;  in ba431_trng_read()
160 	cancel_work_sync(&ba431->reset_work);  in ba431_trng_cleanup()
175 	ba431 = devm_kzalloc(&pdev->dev, sizeof(*ba431), GFP_KERNEL);  in ba431_trng_probe()
177 		return -ENOMEM;  in ba431_trng_probe()
179 	ba431->dev = &pdev->dev;  in ba431_trng_probe()
181 	ba431->base = devm_platform_ioremap_resource(pdev, 0);  in ba431_trng_probe()
182 	if (IS_ERR(ba431->base))  in ba431_trng_probe()
183 		return PTR_ERR(ba431->base);  in ba431_trng_probe()
185 	atomic_set(&ba431->reset_pending, 0);  in ba431_trng_probe()
186 	INIT_WORK(&ba431->reset_work, ba431_trng_reset_work);  in ba431_trng_probe()
187 	ba431->rng.name = pdev->name;  in ba431_trng_probe()
188 	ba431->rng.init = ba431_trng_init;  in ba431_trng_probe()
189 	ba431->rng.cleanup = ba431_trng_cleanup;  in ba431_trng_probe()
190 	ba431->rng.read = ba431_trng_read;  in ba431_trng_probe()
192 	ret = devm_hwrng_register(&pdev->dev, &ba431->rng);  in ba431_trng_probe()
194 		return dev_err_probe(&pdev->dev, ret, "BA431 registration failed\n");  in ba431_trng_probe()
196 	dev_info(&pdev->dev, "BA431 TRNG registered\n");  in ba431_trng_probe()
202 	{ .compatible = "silex-insight,ba431-rng" },
209 		.name = "ba431-rng",
218 MODULE_DESCRIPTION("TRNG driver for Silex Insight BA431");