[coreboot-gerrit] Change in coreboot[master]: WIP: src/amd/picasso/acpi: Add power resource for eMMC

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/42570 )

Change subject: WIP: src/amd/picasso/acpi: Add power resource for eMMC
......................................................................

WIP: src/amd/picasso/acpi: Add power resource for eMMC

This currently gets stuck on storing the registers when entering S3. Is
there something I did wrong?

BUG=b:153001807

Signed-off-by: Raul E Rangel 
Change-Id: I7f695d65d08fe5ae25747ce1c3ce2f881f0c7e7f
---
M src/soc/amd/picasso/acpi/aoac.asl
M src/soc/amd/picasso/acpi/sb_fch.asl
2 files changed, 79 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/70/42570/1

diff --git a/src/soc/amd/picasso/acpi/aoac.asl b/src/soc/amd/picasso/acpi/aoac.asl
index 191619e..4170cdb 100644
--- a/src/soc/amd/picasso/acpi/aoac.asl
+++ b/src/soc/amd/picasso/acpi/aoac.asl
@@ -137,6 +137,69 @@
    	Return (0x08)
    }

+	OperationRegion (SHDW, SystemMemory, ACPIMMIO_AOAC_BASE + 0x80, 8)
+	Field (SHDW, AnyAcc, NoLock, Preserve) {
+		DEV,	30,	// Device
+		REQT,	1,	// Request Type: 0 = Store, 1 = Restore
+		ERR,	1,
+
+		STAT,	30,	// Request Status
+		,	2,	// Reserved
+	}
+
+	/*
+	 * Save the hardware state.
+	 *
+	 *  Arg0: Device ID
+	 */
+	Method (STOR, 1, Serialized)
+	{
+		Printf("Saving state for device %o", Arg0)
+		Local0 = 1 << Arg0
+		Printf("Local0: %o", Local0)
+		Printf("prev REQT: %o", REQT)
+		Printf("prev DEV: %o", DEV)
+		Printf("prev STAT: %o", STAT)
+
+		REQT = 0
+		DEV = Local0
+
+		While (STAT & Local0) {
+			Printf ("Waiting for device to store state: DEV: %o, STAT: %o", DEV, STAT)
+			Stall (200)
+		}
+		Printf("State saved for device %o", Arg0)
+	}
+
+	/*
+	 * Restore the hardware state.
+	 *
+	 *  Arg0: Device ID
+	 */
+	Method (REST, 1, Serialized)
+	{
+		Printf("Restoring state for device %o", Arg0)
+		Local0 = 1 << Arg0
+		Printf("Local0: %o", Local0)
+		Printf("prev REQT: %o", REQT)
+		Printf("prev DEV: %o", DEV)
+		Printf("prev STAT: %o", STAT)
+
+		If (STAT & Local0) {
+			Printf("No previous state")
+			Return ()
+		}
+
+		REQT = 1
+		DEV = Local0
+
+		While (!(STAT & Local0)) {
+			Printf ("Waiting for device to restore state: DEV: %o, STAT: %o", DEV, STAT)
+			Stall (200)
+		}
+		Printf("State restored for device %o", Arg0)
+	}
+
    AOAC_DEVICE(I2C2,	7, 0)
    AOAC_DEVICE(I2C3,	8, 0)
    AOAC_DEVICE(I2C4,	9, 5) /* I2C4 is powered from the S5 power group. */
@@ -144,4 +207,5 @@
    AOAC_DEVICE(FUR1,	12, 0)
    AOAC_DEVICE(FUR2,	16, 0)
    AOAC_DEVICE(FUR3,	26, 0)
+	AOAC_DEVICE(MMC0,	28, 0)
 }
diff --git a/src/soc/amd/picasso/acpi/sb_fch.asl b/src/soc/amd/picasso/acpi/sb_fch.asl
index cb186c4..545af54 100644
--- a/src/soc/amd/picasso/acpi/sb_fch.asl
+++ b/src/soc/amd/picasso/acpi/sb_fch.asl
@@ -90,6 +90,21 @@
    {
    	Return (0x0F)
    }
+
+	Name (_PR0, Package () { _SB.AOAC.MMC0 })
+	Name (_PR2, Package () { _SB.AOAC.MMC0 })
+	Name (_PR3, Package () { _SB.AOAC.MMC0 })
+	Method (_PS0) {
+		Printf("MMC0._PS0")
+		_SB.AOAC.MMC0.TDS = 0
+		_SB.AOAC.REST(28)
+		_SB.AOAC.MMC0.TDS = 1
+	}
+	Method (_PS3) {
+		Printf("MMC0._PS3")
+		_SB.AOAC.STOR(28)
+		_SB.AOAC.FUR1.TDS = 3
+	}
 }

Device (FUR0)