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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Stefan Roese <sr@denx.de>
*/
#include <common.h>
#include <altera.h>
#include <spi.h>
#include <asm/io.h>
#include <linux/errno.h>
/* Write the RBF data to FPGA via SPI */
static int program_write(int spi_bus, int spi_dev, const void *rbf_data,
unsigned long rbf_size)
{
struct spi_slave *slave;
int ret;
debug("%s (%d): data=%p size=%ld\n",
__func__, __LINE__, rbf_data, rbf_size);
/* FIXME: How to get the max. SPI clock and SPI mode? */
slave = spi_setup_slave(spi_bus, spi_dev, 27777777, SPI_MODE_3);
if (!slave)
return -1;
if (spi_claim_bus(slave))
return -1;
ret = spi_xfer(slave, rbf_size * 8, rbf_data, (void *)rbf_data,
SPI_XFER_BEGIN | SPI_XFER_END);
spi_release_bus(slave);
return ret;
}
/*
* This is the interface used by FPGA driver.
* Return 0 for sucess, non-zero for error.
*/
int stratixv_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
{
altera_board_specific_func *pfns = desc->iface_fns;
int cookie = desc->cookie;
int spi_bus;
int spi_dev;
int ret = 0;
if ((u32)rbf_data & 0x3) {
puts("FPGA: Unaligned data, realign to 32bit boundary.\n");
return -EINVAL;
}
/* Run the pre configuration function if there is one */
if (pfns->pre)
(pfns->pre)(cookie);
/* Establish the initial state */
if (pfns->config) {
/* De-assert nCONFIG */
(pfns->config)(false, true, cookie);
/* nConfig minimum low pulse width is 2us */
udelay(200);
/* Assert nCONFIG */
(pfns->config)(true, true, cookie);
/* nCONFIG high to first rising clock on DCLK min 1506 us */
udelay(1600);
}
/* Write the RBF data to FPGA */
if (pfns->write) {
/*
* Use board specific data function to write bitstream
* into the FPGA
*/
ret = (pfns->write)(rbf_data, rbf_size, true, cookie);
} else {
/*
* Use common SPI functions to write bitstream into the
* FPGA
*/
spi_bus = COOKIE2SPI_BUS(cookie);
spi_dev = COOKIE2SPI_DEV(cookie);
ret = program_write(spi_bus, spi_dev, rbf_data, rbf_size);
}
if (ret)
return ret;
/* Check done pin */
if (pfns->done) {
ret = (pfns->done)(cookie);
if (ret)
printf("Error: DONE not set (ret=%d)!\n", ret);
}
return ret;
}
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