test: spl: Split tests up and use some configs

In order to make adding new spl unit tests easier, especially when they may
have many dependencies, add some Kconfigs for the existing image test.
Split it into the parts which are generic (such as callbacks) and the
test-specific parts.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/image/spl_load.c b/test/image/spl_load.c
index 4e27ff4..1a57bf8 100644
--- a/test/image/spl_load.c
+++ b/test/image/spl_load.c
@@ -1,48 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2021 Google LLC
- * Written by Simon Glass <sjg@chromium.org>
+ * Copyright (C) 2023 Sean Anderson <seanga2@gmail.com>
  */
 
 #include <common.h>
-#include <image.h>
 #include <mapmem.h>
-#include <os.h>
-#include <spl.h>
-#include <test/ut.h>
-
-/* Declare a new SPL test */
-#define SPL_TEST(_name, _flags)		UNIT_TEST(_name, _flags, spl_test)
-
-/* Context used for this test */
-struct text_ctx {
-	int fd;
-};
-
-static ulong read_fit_image(struct spl_load_info *load, ulong sector,
-			    ulong count, void *buf)
-{
-	struct text_ctx *text_ctx = load->priv;
-	off_t offset, ret;
-	ssize_t res;
-
-	offset = sector * load->bl_len;
-	ret = os_lseek(text_ctx->fd, offset, OS_SEEK_SET);
-	if (ret != offset) {
-		printf("Failed to seek to %zx, got %zx (errno=%d)\n", offset,
-		       ret, errno);
-		return 0;
-	}
-
-	res = os_read(text_ctx->fd, buf, count * load->bl_len);
-	if (res == -1) {
-		printf("Failed to read %lx bytes, got %ld (errno=%d)\n",
-		       count * load->bl_len, res, errno);
-		return 0;
-	}
-
-	return count;
-}
 
 int board_fit_config_name_match(const char *name)
 {
@@ -53,39 +15,3 @@
 {
 	return map_sysmem(0x100000, 0);
 }
-
-static int spl_test_load(struct unit_test_state *uts)
-{
-	struct spl_image_info image;
-	struct legacy_img_hdr *header;
-	struct text_ctx text_ctx;
-	struct spl_load_info load;
-	char fname[256];
-	int ret;
-	int fd;
-
-	memset(&load, '\0', sizeof(load));
-	load.bl_len = 512;
-	load.read = read_fit_image;
-
-	ret = sandbox_find_next_phase(fname, sizeof(fname), true);
-	if (ret) {
-		printf("(%s not found, error %d)\n", fname, ret);
-		return ret;
-	}
-	load.filename = fname;
-
-	header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
-
-	fd = os_open(fname, OS_O_RDONLY);
-	ut_assert(fd >= 0);
-	ut_asserteq(512, os_read(fd, header, 512));
-	text_ctx.fd = fd;
-
-	load.priv = &text_ctx;
-
-	ut_assertok(spl_load_simple_fit(&image, &load, 0, header));
-
-	return 0;
-}
-SPL_TEST(spl_test_load, 0);