[v4 3/3] fpga-mgr: Add Efinix SPI programming driver

[iansdannapel@gmail.com]

From: Ian Dannapel <iansdannapel@gmail.com>

Add a new driver for loading binary firmware to configuration
RAM using "SPI passive mode" on Efinix FPGAs.

Signed-off-by: Ian Dannapel <iansdannapel@gmail.com>
---
 drivers/fpga/Kconfig      |   7 ++
 drivers/fpga/Makefile     |   1 +
 drivers/fpga/efinix-spi.c | 212 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 220 insertions(+)
 create mode 100644 drivers/fpga/efinix-spi.c

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 37b35f58f0df..b5d60ba62900 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -83,6 +83,13 @@ config FPGA_MGR_XILINX_SPI
 	  FPGA manager driver support for Xilinx FPGA configuration
 	  over slave serial interface.
 
+config FPGA_MGR_EFINIX_SPI
+	tristate "Efinix FPGA configuration over SPI"
+	depends on SPI
+	help
+	  FPGA manager driver support for Efinix FPGAs configuration over SPI
+	  (passive mode only).
+
 config FPGA_MGR_ICE40_SPI
 	tristate "Lattice iCE40 SPI"
 	depends on OF && SPI
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index aeb89bb13517..adbd51d2cd1e 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_FPGA_MGR_TS73XX)		+= ts73xx-fpga.o
 obj-$(CONFIG_FPGA_MGR_XILINX_CORE)	+= xilinx-core.o
 obj-$(CONFIG_FPGA_MGR_XILINX_SELECTMAP)	+= xilinx-selectmap.o
 obj-$(CONFIG_FPGA_MGR_XILINX_SPI)	+= xilinx-spi.o
+obj-$(CONFIG_FPGA_MGR_EFINIX_SPI)	+= efinix-spi.o
 obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
 obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA)	+= zynqmp-fpga.o
 obj-$(CONFIG_FPGA_MGR_VERSAL_FPGA)	+= versal-fpga.o
diff --git a/drivers/fpga/efinix-spi.c b/drivers/fpga/efinix-spi.c
new file mode 100644
index 000000000000..07885110a8a8
--- /dev/null
+++ b/drivers/fpga/efinix-spi.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * FPGA Manager Driver for Efinix
+ *
+ * Copyright (C) 2025 iris-GmbH infrared & intelligent sensors
+ *
+ * Ian Dannapel <iansdannapel@gmail.com>
+ *
+ * Load Efinix FPGA firmware over SPI using the serial configuration interface.
+ *
+ * Note 1: Only passive mode (host initiates transfer) is currently supported.
+ * Note 2: Topaz and Titanium support is based on documentation but remains
+ * untested.
+ */
+
+#include <linux/delay.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+struct efinix_spi_conf {
+	struct spi_device *spi;
+	struct gpio_desc *cdone;
+	struct gpio_desc *reset;
+};
+
+static void efinix_spi_reset(struct efinix_spi_conf *conf)
+{
+	gpiod_set_value(conf->reset, 1);
+	/* tCRESET_N > 320 ns */
+	usleep_range(1, 2);
+	gpiod_set_value(conf->reset, 0);
+
+	/* tDMIN > 32 us */
+	usleep_range(35, 40);
+}
+
+static enum fpga_mgr_states efinix_spi_state(struct fpga_manager *mgr)
+{
+	struct efinix_spi_conf *conf = mgr->priv;
+
+	if (conf->cdone && gpiod_get_value(conf->cdone) == 1)
+		return FPGA_MGR_STATE_OPERATING;
+
+	return FPGA_MGR_STATE_UNKNOWN;
+}
+
+static int efinix_spi_write_init(struct fpga_manager *mgr,
+				 struct fpga_image_info *info,
+				 const char *buf, size_t count)
+{
+	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
+		dev_err(&mgr->dev, "Partial reconfiguration not supported\n");
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int efinix_spi_write(struct fpga_manager *mgr, const char *buf,
+			    size_t count)
+{
+	struct efinix_spi_conf *conf = mgr->priv;
+	int ret;
+	struct spi_message message;
+	struct spi_transfer assert_cs = {
+		.cs_change = 1
+	};
+	struct spi_transfer write_xfer = {
+		.tx_buf = buf,
+		.len = count
+	};
+	struct spi_transfer clk_cycles = {
+		.len = 13,  // > 100 clock cycles
+		.tx_buf = NULL
+	};
+	u8 *dummy_buf;
+
+	dummy_buf = kzalloc(13, GFP_KERNEL);
+	if (!dummy_buf) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	spi_bus_lock(conf->spi->controller);
+	spi_message_init(&message);
+	spi_message_add_tail(&assert_cs, &message);
+	ret = spi_sync_locked(conf->spi, &message);
+	if (ret)
+		goto fail_unlock;
+
+	/* reset with asserted cs */
+	efinix_spi_reset(conf);
+
+	spi_message_init(&message);
+	spi_message_add_tail(&write_xfer, &message);
+
+	clk_cycles.tx_buf = dummy_buf;
+	spi_message_add_tail(&clk_cycles, &message);
+
+	ret = spi_sync_locked(conf->spi, &message);
+	if (ret)
+		dev_err(&mgr->dev, "SPI error in firmware write: %d\n", ret);
+
+fail_unlock:
+	spi_bus_unlock(conf->spi->controller);
+	kfree(dummy_buf);
+fail:
+	return ret;
+}
+
+static int efinix_spi_write_complete(struct fpga_manager *mgr,
+				     struct fpga_image_info *info)
+{
+	struct efinix_spi_conf *conf = mgr->priv;
+	unsigned long timeout =
+		jiffies + usecs_to_jiffies(info->config_complete_timeout_us);
+	bool expired = false;
+	int done;
+
+	if (conf->cdone) {
+		while (!expired) {
+			expired = time_after(jiffies, timeout);
+
+			done = gpiod_get_value(conf->cdone);
+			if (done < 0)
+				return done;
+
+			if (done)
+				break;
+		}
+	}
+
+	if (expired)
+		return -ETIMEDOUT;
+
+	/* tUSER > 25 us */
+	usleep_range(30, 35);
+	return 0;
+}
+
+static const struct fpga_manager_ops efinix_spi_ops = {
+	.state = efinix_spi_state,
+	.write_init = efinix_spi_write_init,
+	.write = efinix_spi_write,
+	.write_complete = efinix_spi_write_complete,
+};
+
+static int efinix_spi_probe(struct spi_device *spi)
+{
+	struct efinix_spi_conf *conf;
+	struct fpga_manager *mgr;
+
+	conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);
+	if (!conf)
+		return -ENOMEM;
+
+	conf->spi = spi;
+
+	conf->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(conf->reset))
+		return dev_err_probe(&spi->dev, PTR_ERR(conf->reset),
+				     "Failed to get RESET gpio\n");
+
+	if (!(spi->mode & SPI_CPHA) || !(spi->mode & SPI_CPOL))
+		return dev_err_probe(&spi->dev, -EINVAL,
+				     "Unsupported SPI mode, set CPHA and CPOL\n");
+
+	conf->cdone = devm_gpiod_get_optional(&spi->dev, "cdone", GPIOD_IN);
+	if (IS_ERR(conf->cdone))
+		return dev_err_probe(&spi->dev, PTR_ERR(conf->cdone),
+				     "Failed to get CDONE gpio\n");
+
+	mgr = devm_fpga_mgr_register(&spi->dev,
+				     "Efinix FPGA Manager",
+				     &efinix_spi_ops, conf);
+
+	return PTR_ERR_OR_ZERO(mgr);
+}
+
+static const struct of_device_id efinix_spi_of_match[] = {
+	{ .compatible = "efinix,trion-spi", },
+	{ .compatible = "efinix,titanium-spi", },
+	{ .compatible = "efinix,topaz-spi", },
+	{ .compatible = "efinix,fpga-spi", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, efinix_spi_of_match);
+
+static const struct spi_device_id efinix_ids[] = {
+	{ "trion-spi", 0 },
+	{ "titanium-spi", 0 },
+	{ "topaz-spi", 0 },
+	{},
+};
+MODULE_DEVICE_TABLE(spi, efinix_ids);
+
+static struct spi_driver efinix_spi_driver = {
+	.driver = {
+		.name = "efinix-spi",
+		.of_match_table = efinix_spi_of_match,
+	},
+	.probe = efinix_spi_probe,
+	.id_table = efinix_ids,
+};
+
+module_spi_driver(efinix_spi_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ian Dannapel <iansdannapel@gmail.com>");
+MODULE_DESCRIPTION("Efinix FPGA SPI Programming Driver (Topaz/Titanium untested)");
-- 
2.43.0