From 4ab5e7c5afe8b6e0077b0ae3108cfccec7eeb128 Mon Sep 17 00:00:00 2001
From: RichardG867 <richardg867@gmail.com>
Date: Wed, 8 Jul 2020 18:21:06 -0300
Subject: [PATCH] STPC: implement PCI IRQ steering, leave blank space for ELCR
 registers

---
 src/chipset/stpc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/chipset/stpc.c b/src/chipset/stpc.c
index fa1210aac..545cc150e 100644
--- a/src/chipset/stpc.c
+++ b/src/chipset/stpc.c
@@ -477,6 +477,16 @@ stpc_reg_write(uint16_t addr, uint8_t val, void *priv)
 		case 0x36:
 			val &= 0x3f;
 			break;
+
+		case 0x52: case 0x53: case 0x54: case 0x55:
+			stpc_log("STPC: Set IRQ routing: INT %c -> %d\n", 0x41 + ((dev->reg_offset & 0x03) ^ 0x02), (val & 0x80) ? (val & 0xf) : -1);
+			val &= 0x8f;
+			pci_set_irq_routing(PCI_INTA + ((dev->reg_offset & 0x03) ^ 0x02), (val & 0x80) ? (val & 0xf) : PCI_IRQ_DISABLED);
+			break;
+
+		case 0x56: case 0x57:
+			/* ELCR goes here */
+			break;
 	}
 
 	dev->regs[dev->reg_offset] = val;