soc/intel/apollolake: Add PM methods to power gate SD card

This implements dynamic generation of sdcard GpioInt in SSDT.
GpioInt in SSDT generation is based on the card detect GPIO if
it is provided by the mainboard in devicetree.

This implements GNVS variable to store the address of sdcard cd pin.
GNVS used to store rxstate of the sdcard cd pin to get card presence.

Add _PS0/_PS3 methods to power gate the sd card controller in
S0ix and runtime PM.

CQ-DEPEND=448173
BUG=chrome-os-partner:63070
TEST=Suspend and resume using 'echo freeze > /sys/power/state'.
System should enter S0ix and resume with no issue.

Change-Id: Id2c42fc66062f0431385607cff1a83563eaeef87
Signed-off-by: Venkateswarlu Vinjamuri <venkateswarlu.v.vinjamuri@intel.com>
Reviewed-on: https://review.coreboot.org/18496
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Vaibhav Shankar <vaibhav.shankar@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/soc/intel/apollolake/acpi/scs.asl b/src/soc/intel/apollolake/acpi/scs.asl
index 4108017fe6..05aedca5a4 100644
--- a/src/soc/intel/apollolake/acpi/scs.asl
+++ b/src/soc/intel/apollolake/acpi/scs.asl
@@ -22,6 +22,9 @@ Scope (\_SB.PCI0) {
 	Field (SBMM, DWordAcc, NoLock, Preserve)
 	{
 		GENR, 32,
+		Offset (0x08),
+		,  5, /* bit[5] represents Force Card Detect SD Card */
+		GRR3,  1, /* GPPRVRW3 for SD Card detect Bypass. It's active high */
 	}
 
 	/* SCC power gate control method, this method must be serialized as
@@ -64,4 +67,39 @@ Scope (\_SB.PCI0) {
 			^^SCPG(1,0x00000041)
 		}
 	} /* Device (SDHA) */
+
+	/* SD CARD */
+	Device (SDCD)
+	{
+		Name (_ADR, 0x001B0000)
+
+		Method (_PS0, 0, NotSerialized)
+		{
+			/* Check SDCard CD pin address is valid */
+			If (LNotEqual (SCD0, 0))
+			{
+				/* Store DW0 into local0 to get rxstate of GPIO */
+				Store (\_SB.GPC0 (\SCD0), Local0)
+				/* Extract rxstate [bit 1] of sdcard card detect pin */
+				And (Local0, PAD_CFG0_RX_STATE, Local0)
+				/* If the sdcard is present, rxstate is low.
+				 * If sdcard is not present, rxstate is High.
+				 * Write the inverted value of rxstate to GRR3.
+				 */
+				If (LEqual (Local0, 0)) {
+					Store (1, ^^GRR3)
+				} Else {
+					Store (0, ^^GRR3)
+				}
+				Sleep (2)
+			}
+		}
+
+		Method (_PS3, 0, NotSerialized)
+		{
+			/* Clear GRR3 to Power Gate SD Controller */
+			Store (0, ^^GRR3)
+		}
+
+	} /* Device (SDCD) */
 }