cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cirrus_legacy.h (530B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Some small helpers for older Cirrus Logic parts.
      4 *
      5 * Copyright (C) 2021 Cirrus Logic, Inc. and
      6 *                    Cirrus Logic International Semiconductor Ltd.
      7 */
      8
      9static inline int cirrus_read_device_id(struct regmap *regmap, unsigned int reg)
     10{
     11	u8 devid[3];
     12	int ret;
     13
     14	ret = regmap_bulk_read(regmap, reg, devid, ARRAY_SIZE(devid));
     15	if (ret < 0)
     16		return ret;
     17
     18	return ((devid[0] & 0xFF) << 12) |
     19	       ((devid[1] & 0xFF) <<  4) |
     20	       ((devid[2] & 0xF0) >>  4);
     21}