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