baytrail: log reset, power, and wake events in elog

When CONFIG_ELOG is selected the reset, power, and wake
events are logged in the eventlog.

BUG=chrome-os-partner:24907
BRANCH=rambi,squawks
TEST=Various resets and wake sources. Interrogated eventlog
     to ensure results are expected.

Change-Id: Ia68548562917be6c2a0d8d405a5b519102b8c563
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/181983
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/5033
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/soc/intel/baytrail/Makefile.inc

@@ -47,6 +47,7 @@ ramstage-y += sd.c
 ramstage-y += perf_power.c
 ramstage-y += stage_cache.c
 romstage-y += stage_cache.c
+ramstage-$(CONFIG_ELOG) += elog.c
 
 # Remove as ramstage gets fleshed out
 ramstage-y += placeholders.c

src/soc/intel/baytrail/elog.c

@@ -0,0 +1,118 @@
+/*
+ * 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/io.h>
+#include <arch/acpi.h>
+#include <stdint.h>
+#include <console/console.h>
+#include <cbmem.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ops.h>
+#include <elog.h>
+#include <baytrail/iomap.h>
+#include <baytrail/pmc.h>
+
+static void log_power_and_resets(const struct chipset_power_state *ps)
+{
+	if (ps->gen_pmcon1 & PWR_FLR) {
+		elog_add_event(ELOG_TYPE_POWER_FAIL);
+		elog_add_event(ELOG_TYPE_PWROK_FAIL);
+	}
+
+	if (ps->gen_pmcon1 & SUS_PWR_FLR) {
+		elog_add_event(ELOG_TYPE_SUS_POWER_FAIL);
+	}
+
+	if (ps->tco_sts & SECOND_TO_STS) {
+		elog_add_event(ELOG_TYPE_TCO_RESET);
+	}
+
+	if (ps->pm1_sts & PRBTNOR_STS) {
+		elog_add_event(ELOG_TYPE_POWER_BUTTON_OVERRIDE);
+	}
+
+	if (ps->gen_pmcon1 & SRS) {
+		elog_add_event(ELOG_TYPE_RESET_BUTTON);
+	}
+
+	if (ps->gen_pmcon1 & GEN_RST_STS) {
+		elog_add_event(ELOG_TYPE_SYSTEM_RESET);
+	}
+}
+
+static void log_wake_events(const struct chipset_power_state *ps)
+{
+	const uint32_t pcie_wake_mask = PCI_EXP_STS | PCIE_WAKE3_STS |
+					PCIE_WAKE2_STS | PCIE_WAKE1_STS |
+					PCIE_WAKE0_STS;
+	uint32_t gpe0_sts;
+	uint32_t gpio_mask;
+	int i;
+
+	/* Mask off disabled events. */
+	gpe0_sts = ps->gpe0_sts & ps->gpe0_en;
+
+	if (ps->pm1_sts & WAK_STS) {
+		elog_add_event_byte(ELOG_TYPE_ACPI_WAKE,
+		                    acpi_slp_type == 3 ? 3 : 5);
+	}
+
+	if (ps->pm1_sts & PWRBTN_STS) {
+		elog_add_event_wake(ELOG_WAKE_SOURCE_PWRBTN, 0);
+	}
+
+	if (ps->pm1_sts & RTC_STS) {
+		elog_add_event_wake(ELOG_WAKE_SOURCE_RTC, 0);
+	}
+
+	if (gpe0_sts & PME_B0_EN) {
+		elog_add_event_wake(ELOG_WAKE_SOURCE_PME_INTERNAL, 0);
+	}
+
+	if (gpe0_sts & pcie_wake_mask) {
+		elog_add_event_wake(ELOG_WAKE_SOURCE_PCIE, 0);
+	}
+
+	gpio_mask = SUS_GPIO_STS0;
+	i = 0;
+	while (gpio_mask) {
+		if (gpio_mask & gpe0_sts) {
+			elog_add_event_wake(ELOG_WAKE_SOURCE_GPIO, i);
+		}
+		gpio_mask <<= 1;
+		i++;
+	}
+}
+
+void southcluster_log_state(void)
+{
+	struct chipset_power_state *ps = cbmem_find(CBMEM_ID_POWER_STATE);
+
+	if (ps == NULL) {
+		printk(BIOS_DEBUG, "Not logging power state information. "
+			"Power state not found in cbmem.\n");
+		return;
+	}
+
+	log_power_and_resets(ps);
+	log_wake_events(ps);
+}