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, 18 insertions, 0 deletions

diff --git a/include/espi.h b/include/espi.h
index d96f79c9c8..2795f9aacb 100644
--- a/include/espi.h
+++ b/include/espi.h
@@ -40,6 +40,8 @@ enum espi_vw_signal {
 	VW_SIGNAL_BASE_END,
 };
 
+#define VW_SIGNAL_COUNT (VW_SIGNAL_BASE_END - VW_SIGNAL_BASE - 1)
+
 /**
  * Set eSPI Virtual-Wire signal to Host
  *
@@ -73,4 +75,20 @@ int espi_vw_enable_wire_int(enum espi_vw_signal signal);
  */
 int espi_vw_disable_wire_int(enum espi_vw_signal signal);
 
+/**
+ * Return pointer to constant eSPI virtual wire signal name
+ *
+ * @param signal virtual wire enum
+ * @return pointer to string or NULL if signal out of range
+ */
+const char *espi_vw_get_wire_name(enum espi_vw_signal signal);
+
+/**
+ * Check if signal is an eSPI virtual wire
+ * @param signal is gpio_signal or espi_vw_signal enum casted to int
+ * @return 1 if signal is virtual wire else returns 0.
+ */
+int espi_signal_is_vw(int signal);
+
+
 #endif  /* __CROS_EC_ESPI_H */