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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cxd2880_io.c (1256B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * cxd2880_io.c
      4 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
      5 * register I/O interface functions
      6 *
      7 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
      8 */
      9
     10#include "cxd2880_io.h"
     11
     12int cxd2880_io_common_write_one_reg(struct cxd2880_io *io,
     13				    enum cxd2880_io_tgt tgt,
     14				    u8 sub_address, u8 data)
     15{
     16	if (!io)
     17		return -EINVAL;
     18
     19	return io->write_regs(io, tgt, sub_address, &data, 1);
     20}
     21
     22int cxd2880_io_set_reg_bits(struct cxd2880_io *io,
     23			    enum cxd2880_io_tgt tgt,
     24			    u8 sub_address, u8 data, u8 mask)
     25{
     26	int ret;
     27
     28	if (!io)
     29		return -EINVAL;
     30
     31	if (mask == 0x00)
     32		return 0;
     33
     34	if (mask != 0xff) {
     35		u8 rdata = 0x00;
     36
     37		ret = io->read_regs(io, tgt, sub_address, &rdata, 1);
     38		if (ret)
     39			return ret;
     40
     41		data = (data & mask) | (rdata & (mask ^ 0xff));
     42	}
     43
     44	return io->write_reg(io, tgt, sub_address, data);
     45}
     46
     47int cxd2880_io_write_multi_regs(struct cxd2880_io *io,
     48			     enum cxd2880_io_tgt tgt,
     49			     const struct cxd2880_reg_value reg_value[],
     50			     u8 size)
     51{
     52	int ret;
     53	int i;
     54
     55	if (!io)
     56		return -EINVAL;
     57
     58	for (i = 0; i < size ; i++) {
     59		ret = io->write_reg(io, tgt, reg_value[i].addr,
     60				    reg_value[i].value);
     61		if (ret)
     62			return ret;
     63	}
     64
     65	return 0;
     66}