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_devio_spi.c (2596B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * cxd2880_devio_spi.c
      4 * Sony CXD2880 DVB-T2/T tuner + demodulator driver
      5 * I/O interface via SPI
      6 *
      7 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
      8 */
      9
     10#include "cxd2880_devio_spi.h"
     11
     12#define BURST_WRITE_MAX 128
     13
     14static int cxd2880_io_spi_read_reg(struct cxd2880_io *io,
     15				   enum cxd2880_io_tgt tgt,
     16				   u8 sub_address, u8 *data,
     17				   u32 size)
     18{
     19	int ret = 0;
     20	struct cxd2880_spi *spi = NULL;
     21	u8 send_data[6];
     22	u8 *read_data_top = data;
     23
     24	if (!io || !io->if_object || !data)
     25		return -EINVAL;
     26
     27	if (sub_address + size > 0x100)
     28		return -EINVAL;
     29
     30	spi = io->if_object;
     31
     32	if (tgt == CXD2880_IO_TGT_SYS)
     33		send_data[0] = 0x0b;
     34	else
     35		send_data[0] = 0x0a;
     36
     37	send_data[3] = 0;
     38	send_data[4] = 0;
     39	send_data[5] = 0;
     40
     41	while (size > 0) {
     42		send_data[1] = sub_address;
     43		if (size > 255)
     44			send_data[2] = 255;
     45		else
     46			send_data[2] = size;
     47
     48		ret =
     49		    spi->write_read(spi, send_data, sizeof(send_data),
     50				    read_data_top, send_data[2]);
     51		if (ret)
     52			return ret;
     53
     54		sub_address += send_data[2];
     55		read_data_top += send_data[2];
     56		size -= send_data[2];
     57	}
     58
     59	return ret;
     60}
     61
     62static int cxd2880_io_spi_write_reg(struct cxd2880_io *io,
     63				    enum cxd2880_io_tgt tgt,
     64				    u8 sub_address,
     65				    const u8 *data, u32 size)
     66{
     67	int ret = 0;
     68	struct cxd2880_spi *spi = NULL;
     69	u8 send_data[BURST_WRITE_MAX + 4];
     70	const u8 *write_data_top = data;
     71
     72	if (!io || !io->if_object || !data)
     73		return -EINVAL;
     74
     75	if (size > BURST_WRITE_MAX)
     76		return -EINVAL;
     77
     78	if (sub_address + size > 0x100)
     79		return -EINVAL;
     80
     81	spi = io->if_object;
     82
     83	if (tgt == CXD2880_IO_TGT_SYS)
     84		send_data[0] = 0x0f;
     85	else
     86		send_data[0] = 0x0e;
     87
     88	while (size > 0) {
     89		send_data[1] = sub_address;
     90		if (size > 255)
     91			send_data[2] = 255;
     92		else
     93			send_data[2] = size;
     94
     95		memcpy(&send_data[3], write_data_top, send_data[2]);
     96
     97		if (tgt == CXD2880_IO_TGT_SYS) {
     98			send_data[3 + send_data[2]] = 0x00;
     99			ret = spi->write(spi, send_data, send_data[2] + 4);
    100		} else {
    101			ret = spi->write(spi, send_data, send_data[2] + 3);
    102		}
    103		if (ret)
    104			return ret;
    105
    106		sub_address += send_data[2];
    107		write_data_top += send_data[2];
    108		size -= send_data[2];
    109	}
    110
    111	return ret;
    112}
    113
    114int cxd2880_io_spi_create(struct cxd2880_io *io,
    115			  struct cxd2880_spi *spi, u8 slave_select)
    116{
    117	if (!io || !spi)
    118		return -EINVAL;
    119
    120	io->read_regs = cxd2880_io_spi_read_reg;
    121	io->write_regs = cxd2880_io_spi_write_reg;
    122	io->write_reg = cxd2880_io_common_write_one_reg;
    123	io->if_object = spi;
    124	io->i2c_address_sys = 0;
    125	io->i2c_address_demod = 0;
    126	io->slave_select = slave_select;
    127
    128	return 0;
    129}