sb/intel: Extract `set_global_reset` function

To avoid duplicating this function in ramstage, factor it out.

Change-Id: I64c59a01ca153770481c28ae404a5dfe8c5382d2
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50362
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Evgeny Zinoviev <me@ch1p.io>
Reviewed-by: Nico Huber <nico.h@gmx.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/southbridge/intel/common/me.c b/src/southbridge/intel/common/me.c
new file mode 100644
index 0000000000..d49508748a
--- /dev/null
+++ b/src/southbridge/intel/common/me.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define __SIMPLE_DEVICE__
+
+#include <device/pci_ops.h>
+#include <types.h>
+
+#include "me.h"
+
+#define PCH_LPC_DEV		PCI_DEV(0, 0x1f, 0)
+
+#define ETR3			0xac
+#define  ETR3_CWORWRE		(1 << 18)
+#define  ETR3_CF9GR		(1 << 20)
+#define  ETR3_CF9LOCK		(1 << 31)
+
+void set_global_reset(const bool enable)
+{
+	u32 etr3 = pci_read_config32(PCH_LPC_DEV, ETR3);
+
+	/* Clear CF9 Without Resume Well Reset Enable */
+	etr3 &= ~ETR3_CWORWRE;
+
+	/* CF9GR indicates a Global Reset */
+	if (enable)
+		etr3 |= ETR3_CF9GR;
+	else
+		etr3 &= ~ETR3_CF9GR;
+
+	pci_write_config32(PCH_LPC_DEV, ETR3, etr3);
+}