espi: Add API to test if signal is eSPI virtual wire

Add espi_signal_is_vw in new file common/espi.c for
testing if a signal is an eSPI virtual wire. API used
in power common and intel_x86.
Fix CONFIG_BRINGUP support for eSPI (off by default).
Add espi_vw_get_wire_name returning a pointer to
constant string. Chip modules do not need to maintain
names of eSPI signals.

BRANCH=none
BUG=
TEST=Build poppy and other eSPI enabled boards. Test
power state machine.

Change-Id: I13319e79d208c69092a02ec3ac655477d3043d61
Signed-off-by: Scott Worley <scott.worley@microchip.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/836818
Commit-Ready: Randall Spangler <rspangler@chromium.org>
Tested-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/common/espi.c b/common/espi.c
new file mode 100644
index 0000000000..4c6a0ed1c2
--- /dev/null
+++ b/common/espi.c
@@ -0,0 +1,67 @@
+/* Copyright (c) 2017 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* eSPI common functionality for Chrome EC */
+
+#include "common.h"
+#include "gpio.h"
+#include "registers.h"
+#include "espi.h"
+#include "timer.h"
+#include "util.h"
+
+
+const char *espi_vw_names[] = {
+	"VW_SLP_S3_L",
+	"VW_SLP_S4_L",
+	"VW_SLP_S5_L",
+	"VW_SUS_STAT_L",
+	"VW_PLTRST_L",
+	"VW_OOB_RST_WARN",
+	"VW_OOB_RST_ACK",
+	"VW_WAKE_L",
+	"VW_PME_L",
+	"VW_ERROR_FATAL",
+	"VW_ERROR_NON_FATAL",
+	/* Merge bit 3/0 into one signal. Need to set them simultaneously */
+	"VW_SLAVE_BTLD_STATUS_DONE",
+	"VW_SCI_L",
+	"VW_SMI_L",
+	"VW_RCIN_L",
+	"VW_HOST_RST_ACK",
+	"VW_HOST_RST_WARN",
+	"VW_SUS_ACK",
+	"VW_SUS_WARN_L",
+	"VW_SUS_PWRDN_ACK_L",
+	"VW_SLP_A_L",
+	"VW_SLP_LAN",
+	"VW_SLP_WLAN",
+};
+BUILD_ASSERT(ARRAY_SIZE(espi_vw_names) == VW_SIGNAL_COUNT);
+
+
+const char *espi_vw_get_wire_name(enum espi_vw_signal signal)
+{
+	int idx;
+
+	if ((uint32_t)signal > VW_SIGNAL_BASE) {
+		idx = (uint32_t)signal - (VW_SIGNAL_BASE + 1);
+		if (idx < ARRAY_SIZE(espi_vw_names))
+			return espi_vw_names[idx];
+	}
+
+	return NULL;
+}
+
+
+int espi_signal_is_vw(int signal)
+{
+	enum espi_vw_signal sig = (enum espi_vw_signal)signal;
+
+	if ((sig > VW_SIGNAL_BASE) && (sig < VW_SIGNAL_BASE_END))
+		return 1;
+
+	return 0;
+}