soc/intel/common: Add virtual wire mapping entries to GPIO communities

Some SoCs may define virtual wire entries for certain GPIOs. This patch
allows SoC code to provide the mappings from GPIO pads to virtual wire
indexes and bits when they are provided. Also a function
`gpio_get_vw_info` is added to return this information.

Change-Id: I87adf0ca06cb5b7969bb2c258d6daebd44bb9748
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52588
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/gpio/gpio.c b/src/soc/intel/common/block/gpio/gpio.c
index 4398c9fb62..db7654537a 100644
--- a/src/soc/intel/common/block/gpio/gpio.c
+++ b/src/soc/intel/common/block/gpio/gpio.c
@@ -763,3 +763,27 @@ static void snapshot_cleanup(void *unused)
 
 BOOT_STATE_INIT_ENTRY(BS_OS_RESUME,    BS_ON_EXIT, snapshot_cleanup, NULL);
 BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, snapshot_cleanup, NULL);
+
+bool gpio_get_vw_info(gpio_t pad, unsigned int *vw_index, unsigned int *vw_bit)
+{
+	const struct pad_community *comm;
+	unsigned int offset = 0;
+	size_t i;
+
+	comm = gpio_get_community(pad);
+	for (i = 0; i < comm->num_vw_entries; i++) {
+		if (pad >= comm->vw_entries[i].first_pad && pad <= comm->vw_entries[i].last_pad)
+			break;
+
+		offset += 1 + comm->vw_entries[i].last_pad - comm->vw_entries[i].first_pad;
+	}
+
+	if (i == comm->num_vw_entries)
+		return false;
+
+	offset += pad - comm->vw_entries[i].first_pad;
+	*vw_index = comm->vw_base + offset / 8;
+	*vw_bit = offset % 8;
+
+	return true;
+}