mb/amd/mandolin: introduce mb_get_fch_irq_mapping

Introduce mb_get_fch_irq_mapping to access the FCH IRQ routing mapping
information and use it in init_tables to get the mapping instead of
directly accessing the array's contents. This is a preparation to move
the init_tables implementation to the common AMD SoC code in a later
patch.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I9c39ea9de5ebbf70d2c5a87bfdfe270796548c5c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68847
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

1 files changed, 14 insertions, 6 deletions

diff --git a/src/mainboard/amd/mandolin/mainboard.c b/src/mainboard/amd/mandolin/mainboard.c
index 6c4e545fd6..1eb3329d13 100644
--- a/src/mainboard/amd/mandolin/mainboard.c
+++ b/src/mainboard/amd/mandolin/mainboard.c
@@ -51,18 +51,26 @@ static const struct fch_irq_routing fch_irq_map[] = {
 	{ PIRQ_MISC2,	0x00,		0x00 },
 };
 
+static const struct fch_irq_routing *mb_get_fch_irq_mapping(size_t *length)
+{
+	*length = ARRAY_SIZE(fch_irq_map);
+	return fch_irq_map;
+}
+
 static void init_tables(void)
 {
-	const struct fch_irq_routing *entry;
-	int i;
+	const struct fch_irq_routing *mb_irq_map;
+	size_t mb_fch_irq_mapping_table_size;
+	size_t i;
+
+	mb_irq_map = mb_get_fch_irq_mapping(&mb_fch_irq_mapping_table_size);
 
 	memset(fch_pic_routing, PIRQ_NC, sizeof(fch_pic_routing));
 	memset(fch_apic_routing, PIRQ_NC, sizeof(fch_apic_routing));
 
-	for (i = 0; i < ARRAY_SIZE(fch_irq_map); i++) {
-		entry = fch_irq_map + i;
-		fch_pic_routing[entry->intr_index] = entry->pic_irq_num;
-		fch_apic_routing[entry->intr_index] = entry->apic_irq_num;
+	for (i = 0; i < mb_fch_irq_mapping_table_size; i++) {
+		fch_pic_routing[mb_irq_map[i].intr_index] = mb_irq_map[i].pic_irq_num;
+		fch_apic_routing[mb_irq_map[i].intr_index] = mb_irq_map[i].apic_irq_num;
 	}
 }