[coreboot-gerrit] Change in coreboot[master]: superio/aspeed/ast2400: Add eSPI auto detection

[Christian Walter (Code Review)]

Christian Walter has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/38586 )

Change subject: superio/aspeed/ast2400: Add eSPI auto detection
......................................................................

superio/aspeed/ast2400: Add eSPI auto detection

Change-Id: Ide58f3210475d949d69d9a91da8b83fc5b2b38ac
Signed-off-by: Christian Walter 
---
M src/superio/aspeed/ast2400/superio.c
1 file changed, 11 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/38586/1

diff --git a/src/superio/aspeed/ast2400/superio.c b/src/superio/aspeed/ast2400/superio.c
index 6f2cbcd..556dea9 100644
--- a/src/superio/aspeed/ast2400/superio.c
+++ b/src/superio/aspeed/ast2400/superio.c
@@ -31,7 +31,17 @@
    if (!dev->enabled)
    	return;

-	if (conf && conf->use_espi) {
+
+	// Detect eSPI Mode automatically
+	pnp_enter_conf_mode(dev);
+	pnp_set_logical_device(dev);
+	u8 val = pnp_read_config(dev, 0x70) & 0x07;
+	pnp_exit_conf_mode(dev);
+
+	if (val == 0xC) {
+		if (conf)
+                        conf->use_espi = 1;
+
    	pnp_enter_conf_mode(dev);
    	pnp_set_logical_device(dev);
    	/* In ESPI mode must write 0 to IRQ level on every LDN */