1 files changed, 100 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/ramstage.c b/src/soc/intel/skylake/ramstage.c
new file mode 100644
index 0000000000..eaa28d02f1
--- /dev/null
+++ b/src/soc/intel/skylake/ramstage.c
@@ -0,0 +1,100 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/acpi.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <stdlib.h>
+#include <string.h>
+#include <soc/nvs.h>
+#include <soc/pm.h>
+#include <soc/ramstage.h>
+#include <soc/intel/broadwell/chip.h>
+
+/* Save bit index for PM1_STS and GPE_STS for ACPI _SWS */
+static void save_acpi_wake_source(global_nvs_t *gnvs)
+{
+	struct chipset_power_state *ps = cbmem_find(CBMEM_ID_POWER_STATE);
+	uint16_t pm1;
+	int gpe_reg;
+
+	if (!ps)
+		return;
+
+	pm1 = ps->pm1_sts & ps->pm1_en;
+
+	/* Scan for first set bit in PM1 */
+	for (gnvs->pm1i = 0; gnvs->pm1i < 16; gnvs->pm1i++) {
+		if (pm1 & 1)
+			break;
+		pm1 >>= 1;
+	}
+
+	/* If unable to determine then return -1 */
+	if (gnvs->pm1i >= 16)
+		gnvs->pm1i = -1;
+
+	/* Scan for first set bit in GPE registers */
+	gnvs->gpei = -1;
+	for (gpe_reg = 0; gpe_reg < GPE0_REG_MAX; gpe_reg++) {
+		u32 gpe = ps->gpe0_sts[gpe_reg] & ps->gpe0_en[gpe_reg];
+		int start = gpe_reg * GPE0_REG_SIZE;
+		int end = start + GPE0_REG_SIZE;
+
+		if (gpe == 0) {
+			if (!gnvs->gpei)
+				gnvs->gpei = end;
+			continue;
+		}
+
+		for (gnvs->gpei = start; gnvs->gpei < end; gnvs->gpei++) {
+			if (gpe & 1)
+				break;
+			gpe >>= 1;
+		}
+	}
+
+	/* If unable to determine then return -1 */
+	if (gnvs->gpei >= (GPE0_REG_MAX * GPE0_REG_SIZE))
+		gnvs->gpei = -1;
+
+	printk(BIOS_DEBUG, "ACPI _SWS is PM1 Index %lld GPE Index %lld\n",
+	       gnvs->pm1i, gnvs->gpei);
+}
+
+static void s3_resume_prepare(void)
+{
+	global_nvs_t *gnvs;
+
+	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, sizeof(global_nvs_t));
+	if (gnvs == NULL)
+		return;
+
+	if (!acpi_is_wakeup_s3())
+		memset(gnvs, 0, sizeof(global_nvs_t));
+	else
+		save_acpi_wake_source(gnvs);
+}
+
+void broadwell_init_pre_device(void *chip_info)
+{
+	s3_resume_prepare();
+	broadwell_run_reference_code();
+}