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/*
* This file is part of the coreboot project.
*
* Copyright 2016 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <spi-generic.h>
#include <string.h>
int spi_claim_bus(const struct spi_slave *slave)
{
const struct spi_ctrlr *ctrlr = slave->ctrlr;
if (ctrlr && ctrlr->claim_bus)
return ctrlr->claim_bus(slave);
return 0;
}
void spi_release_bus(const struct spi_slave *slave)
{
const struct spi_ctrlr *ctrlr = slave->ctrlr;
if (ctrlr && ctrlr->release_bus)
ctrlr->release_bus(slave);
}
int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout,
void *din, size_t bytesin)
{
const struct spi_ctrlr *ctrlr = slave->ctrlr;
if (ctrlr && ctrlr->xfer)
return ctrlr->xfer(slave, dout, bytesout, din, bytesin);
return -1;
}
void __attribute__((weak)) spi_init(void)
{
/* Default weak implementation - do nothing. */
}
const struct spi_ctrlr_buses spi_ctrlr_bus_map[0] __attribute__((weak));
const size_t spi_ctrlr_bus_map_count __attribute__((weak));
int __attribute__((weak)) spi_setup_slave(unsigned int bus, unsigned int cs,
struct spi_slave *slave)
{
size_t i;
memset(slave, 0, sizeof(*slave));
for (i = 0; i < spi_ctrlr_bus_map_count; i++) {
if ((spi_ctrlr_bus_map[i].bus_start <= bus) &&
(spi_ctrlr_bus_map[i].bus_end >= bus)) {
slave->ctrlr = spi_ctrlr_bus_map[i].ctrlr;
break;
}
}
if (slave->ctrlr == NULL)
return -1;
slave->bus = bus;
slave->cs = cs;
if (slave->ctrlr->setup)
return slave->ctrlr->setup(slave);
return 0;
}
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