acpi: Hide Chrome and coreboot specific devices

Some ACPI interfaces introduced by Chrome or coreboot do not
need drivers outside ChromeOS, for example Chrome EC or
coreboot table; or will be probed by direct ACPI calls (instead
of trying to find drivers by device IDs).

These interfaces should be set to hidden so non-ChromeOS systems,
for example Windows, won't have problem finding driver.

Interfaces changed:
- coreboot (BOOT0000), only used by Chrome OS / Linux kernel.
- Chrome OS EC
- Chrome OS EC PD
- Chrome OS TBMC
- Chrome OS RAMoops

BUG=b:72200466
BRANCH=eve
TEST=Boot into non-ChromeOS systems (for example Windows)
     and checked ACPI devices on UI.

Change-Id: I9786cf9ee07b2c3f11509850604f2bfb3f3e710a
Signed-off-by: David Wu <David_Wu@quanta.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/1078211
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Trybot-Ready: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/28333
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

6 files changed, 20 insertions, 1 deletions

diff --git a/src/arch/x86/acpi.c b/src/arch/x86/acpi.c
index 012fe186e7..0701bbe8fb 100644
--- a/src/arch/x86/acpi.c
+++ b/src/arch/x86/acpi.c
@@ -324,7 +324,7 @@ static void acpi_ssdt_write_cbtable(void)
 	acpigen_write_device("CTBL");
 	acpigen_write_coreboot_hid(COREBOOT_ACPI_ID_CBTABLE);
 	acpigen_write_name_integer("_UID", 0);
-	acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
+	acpigen_write_STA(ACPI_STATUS_DEVICE_HIDDEN_ON);
 	acpigen_write_name("_CRS");
 	acpigen_write_resourcetemplate_header();
 	acpigen_write_mem32fixed(0, base, size);
diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h
index 775339a713..a27bd6f277 100644
--- a/src/arch/x86/include/arch/acpigen.h
+++ b/src/arch/x86/include/arch/acpigen.h
@@ -36,6 +36,9 @@
 					 ACPI_STATUS_DEVICE_ENABLED |\
 					 ACPI_STATUS_DEVICE_SHOW_IN_UI |\
 					 ACPI_STATUS_DEVICE_STATE_OK)
+#define ACPI_STATUS_DEVICE_HIDDEN_ON	(ACPI_STATUS_DEVICE_PRESENT |\
+					 ACPI_STATUS_DEVICE_ENABLED |\
+					 ACPI_STATUS_DEVICE_STATE_OK)
 
 /* ACPI Op/Prefix Codes */
 enum {
diff --git a/src/ec/google/chromeec/acpi/cros_ec.asl b/src/ec/google/chromeec/acpi/cros_ec.asl
index 1d7fb5227b..d0a5b68438 100644
--- a/src/ec/google/chromeec/acpi/cros_ec.asl
+++ b/src/ec/google/chromeec/acpi/cros_ec.asl
@@ -39,4 +39,8 @@ Device (CREC)
 		Name (_DDN, "EC Base Switch Device")
 	}
 #endif
+	Method(_STA, 0)
+	{
+		Return (0xB)
+	}
 }
diff --git a/src/ec/google/chromeec/acpi/pd.asl b/src/ec/google/chromeec/acpi/pd.asl
index a5a58f5534..7b799e82ee 100644
--- a/src/ec/google/chromeec/acpi/pd.asl
+++ b/src/ec/google/chromeec/acpi/pd.asl
@@ -18,4 +18,8 @@ Device (ECPD)
 	Name (_HID, "GOOG0003")
 	Name (_UID, 1)
 	Name (_DDN, "EC PD Device")
+	Method(_STA, 0)
+	{
+		Return (0xB)
+	}
 }
diff --git a/src/ec/google/chromeec/acpi/tbmc.asl b/src/ec/google/chromeec/acpi/tbmc.asl
index 25a27ef1be..86a6de86ba 100644
--- a/src/ec/google/chromeec/acpi/tbmc.asl
+++ b/src/ec/google/chromeec/acpi/tbmc.asl
@@ -26,4 +26,8 @@ Device (TBMC)
 			Return (0x0)
 		}
 	}
+	Method(_STA, 0)
+	{
+		Return (0xB)
+	}
 }
diff --git a/src/vendorcode/google/chromeos/acpi/ramoops.asl b/src/vendorcode/google/chromeos/acpi/ramoops.asl
index 5a8ed86632..810ff91a01 100644
--- a/src/vendorcode/google/chromeos/acpi/ramoops.asl
+++ b/src/vendorcode/google/chromeos/acpi/ramoops.asl
@@ -35,5 +35,9 @@ Scope (\_SB)
 			Store (\RMOL, RLEN)
 			Return (^RBUF)
 		}
+		Method(_STA, 0)
+		{
+			Return (0xB)
+		}
 	}
 }