soc/amd/picasso/acpi: Add missing eMMC device

BUG=b:154756391
TEST=Boot trembyle and see that /dev/mmcblk1 now exists

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ica83b78a7ab081d9eac9f5e267b2904dcde0b283
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41836
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/amd/picasso/acpi/pcie.asl

@@ -16,6 +16,9 @@
 		PIRG, 0x00000008,	/* Index 6: INTG */
 		PIRH, 0x00000008,	/* Index 7: INTH */
 
+		Offset (0x43),
+		PMMC, 0x00000008,	/* Index 0x43: eMMC */
+
 		Offset (0x62),
 		PGPI, 0x00000008,	/* Index 0x62: GPIO */
 
@@ -42,6 +45,9 @@
 		IORG, 0x00000008,	/* Index 0x86: INTG */
 		IORH, 0x00000008,	/* Index 0x87: INTH */
 
+		Offset (0xC3),
+		IMMC, 0x00000008,	/* Index 0xC3: eMMC */
+
 		Offset (0xE2),
 		IGPI, 0x00000008,	/* Index 0xE2: GPIO */
 

src/soc/amd/picasso/acpi/sb_fch.asl

@@ -57,6 +57,41 @@ Device (GPIO)
 	}
 }
 
+Device (MMC0)
+{
+	Name (_HID, "AMDI0040")
+	Name (_UID, 0x0)
+	Method (_CRS, 0) {
+		Name (RBUF, ResourceTemplate() {
+			Interrupt (
+				ResourceConsumer,
+				Level,
+				ActiveLow,
+				Exclusive, , , IRQR)
+			{ 0 }
+			Memory32Fixed (ReadWrite, APU_EMMC_BASE, 0x1000)
+		})
+		CreateDWordField (RBUF, IRQR._INT, IRQN)
+		If (PMOD) {
+			IRQN = IMMC
+		} Else {
+			IRQN = PMMC
+		}
+		If (IRQN == 0x1f) {
+			Return (ResourceTemplate(){
+				Memory32Fixed (ReadWrite, APU_EMMC_BASE, 0x1000)
+			})
+		} Else {
+			Return (RBUF)
+		}
+	}
+
+	Method (_STA, 0x0, NotSerialized)
+	{
+		Return (0x0F)
+	}
+}
+
 Device (FUR0)
 {
 	Name (_HID, "AMD0020")