fpga: altera: Add StratixV support

This patch adds support for programming of the StratixV FPGAs. Programming
is done in this case (board theadorable) via SPI. The board may provide
board specific code for bitstream programming.

This StratixV support will be used by the theadorable board.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: Stefan Roese <sr@denx.de>

3 files changed, 107 insertions, 0 deletions

diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index 6aa24d4359..fec3fecbdf 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -17,5 +17,6 @@ obj-y += altera.o
 obj-$(CONFIG_FPGA_ACEX1K) += ACEX1K.o
 obj-$(CONFIG_FPGA_CYCLON2) += cyclon2.o
 obj-$(CONFIG_FPGA_STRATIX_II) += stratixII.o
+obj-$(CONFIG_FPGA_STRATIX_V) += stratixv.o
 obj-$(CONFIG_FPGA_SOCFPGA) += socfpga.o
 endif
diff --git a/drivers/fpga/altera.c b/drivers/fpga/altera.c
index a5bfe5dce1..135a3572a8 100644
--- a/drivers/fpga/altera.c
+++ b/drivers/fpga/altera.c
@@ -37,6 +37,9 @@ static const struct altera_fpga {
 	{ Altera_StratixII, "StratixII", StratixII_load,
 	  StratixII_dump, StratixII_info },
 #endif
+#if defined(CONFIG_FPGA_STRATIX_V)
+	{ Altera_StratixV, "StratixV", stratixv_load, NULL, NULL },
+#endif
 #if defined(CONFIG_FPGA_SOCFPGA)
 	{ Altera_SoCFPGA, "SoC FPGA", socfpga_load, NULL, NULL },
 #endif
diff --git a/drivers/fpga/stratixv.c b/drivers/fpga/stratixv.c
new file mode 100644
index 0000000000..cc035eb2a1
--- /dev/null
+++ b/drivers/fpga/stratixv.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <altera.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <asm/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;
+}