event: Add fpga load event

This enables implementing custom logic after a bitstream was loaded
into the fpga.

Signed-off-by: Christian Taedcke <christian.taedcke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Link: https://lore.kernel.org/r/20230720072724.11516-1-christian.taedcke-oss@weidmueller.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

common/event.c

@@ -36,6 +36,9 @@ const char *const type_name[] = {
 	/* init hooks */
 	"misc_init_f",
 
+	/* Fpga load hook */
+	"fpga_load",
+
 	/* fdt hooks */
 	"ft_fixup",
 

drivers/fpga/fpga.c

@@ -244,6 +244,21 @@ int fpga_loads(int devnum, const void *buf, size_t size,
 }
 #endif
 
+static int fpga_load_event_notify(const void *buf, size_t bsize, int result)
+{
+	if (CONFIG_IS_ENABLED(EVENT)) {
+		struct event_fpga_load load = {
+			.buf = buf,
+			.bsize = bsize,
+			.result = result
+		};
+
+		return event_notify(EVT_FPGA_LOAD, &load, sizeof(load));
+	}
+
+	return 0;
+}
+
 /*
  * Generic multiplexing code
  */
@@ -251,6 +266,7 @@ int fpga_load(int devnum, const void *buf, size_t bsize, bitstream_type bstype,
 	      int flags)
 {
 	int ret_val = FPGA_FAIL;           /* assume failure */
+	int ret_notify;
 	const fpga_desc *desc = fpga_validate(devnum, buf, bsize,
 					      (char *)__func__);
 
@@ -284,6 +300,10 @@ int fpga_load(int devnum, const void *buf, size_t bsize, bitstream_type bstype,
 		}
 	}
 
+	ret_notify = fpga_load_event_notify(buf, bsize, ret_val);
+	if (ret_notify)
+		return ret_notify;
+
 	return ret_val;
 }
 

include/event.h

@@ -11,6 +11,7 @@
 #define __event_h
 
 #include <dm/ofnode_decl.h>
+#include <linux/types.h>
 
 /**
  * enum event_t - Types of events supported by U-Boot
@@ -31,6 +32,9 @@ enum event_t {
 	/* Init hooks */
 	EVT_MISC_INIT_F,
 
+	/* Fpga load hook */
+	EVT_FPGA_LOAD,
+
 	/* Device tree fixups before booting */
 	EVT_FT_FIXUP,
 
@@ -59,6 +63,19 @@ union event_data {
 		struct udevice *dev;
 	} dm;
 
+	/**
+	 * struct event_fpga_load - fpga load event
+	 *
+	 * @buf: The buffer that was loaded into the fpga
+	 * @bsize: The size of the buffer that was loaded into the fpga
+	 * @result: Result of the load operation
+	 */
+	struct event_fpga_load {
+		const void *buf;
+		size_t bsize;
+		int result;
+	} fpga_load;
+
 	/**
 	 * struct event_ft_fixup - FDT fixup before booting
 	 *