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/linux/Documentation/devicetree/bindings/rng/
H A Darm-cctrng.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rng/arm-cctrng.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Hadar Gat <hadar.gat@arm.com>
18 - arm,cryptocell-713-trng
19 - arm,cryptocell-703-trng
27 arm,rosc-ratio:
30 Sampling ratio values for these 4 ring oscillators. (from calibration)
31 $ref: /schemas/types.yaml#/definitions/uint32-array
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/linux/drivers/char/hw_random/
H A Dcctrng.c1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2019-2020 ARM Limited or its affiliates. */
23 #define CC_REG_HIGH(name) (CC_REG_LOW(name) + name ## _BIT_SIZE - 1)
33 * - of a power-of-2 size (limitation of circ_buf.h macros)
34 * - at least 6, the size generated in the EHR according to HW implementation
41 * - SAMPLE_CNT is input value from the characterisation process
42 * - all the rest are constants
59 * Value of 0 indicates non-valid rosc
68 /* pending_hw - 1 when HW is pending, 0 when it is idle */
79 iowrite32(val, (drvdata->cc_base + reg)); in cc_iowrite()
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