drv/intel/gma/opregion: Add interface for GNVS ASLB handling

Add and use new interface to set and get GNVS' ASLB register.
To be used by Intel's gma driver to set ASLB at ACPI table
creation and to get ASLB on S3 resume.

Change-Id: If30c6b2270069783b0892774802f47406404da5f
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20435
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/drivers/intel/gma/opregion.h

@@ -246,5 +246,7 @@ typedef struct {
 } __attribute__((packed)) optionrom_vbt_t;
 
 void intel_gma_opregion_register(uintptr_t opregion);
+uintptr_t gma_get_gnvs_aslb(const void *gnvs);
+void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb);
 
 #endif /* _COMMON_GMA_H_ */

src/northbridge/intel/fsp_sandybridge/gma.c

@@ -53,6 +53,19 @@ u32 map_oprom_vendev(u32 vendev)
 	return new_vendev;
 }
 
+uintptr_t gma_get_gnvs_aslb(const void *gnvs)
+{
+	const global_nvs_t *gnvs_ptr = gnvs;
+	return (uintptr_t)(gnvs_ptr ? gnvs_ptr->aslb : 0);
+}
+
+void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb)
+{
+	global_nvs_t *gnvs_ptr = gnvs;
+	if (gnvs_ptr)
+		gnvs_ptr->aslb = aslb;
+}
+
 static void gma_set_subsystem(device_t dev, unsigned vendor, unsigned device)
 {
 	if (!vendor || !device) {
@@ -121,7 +134,7 @@ gma_write_acpi_tables(struct device *const dev,
 	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
 	if (gnvs) {
 		/* IGD OpRegion Base Address */
-		gnvs->aslb = (u32)(uintptr_t)opregion;
+		gma_set_gnvs_aslb(gnvs, (uintptr_t)opregion);
 	} else {
 		printk(BIOS_ERR, "Error: GNVS table not found.\n");
 	}

src/northbridge/intel/haswell/gma.c

@@ -215,6 +215,19 @@ int gtt_poll(u32 reg, u32 mask, u32 value)
 	return 0;
 }
 
+uintptr_t gma_get_gnvs_aslb(const void *gnvs)
+{
+	const global_nvs_t *gnvs_ptr = gnvs;
+	return (uintptr_t)(gnvs_ptr ? gnvs_ptr->aslb : 0);
+}
+
+void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb)
+{
+	global_nvs_t *gnvs_ptr = gnvs;
+	if (gnvs_ptr)
+		gnvs_ptr->aslb = aslb;
+}
+
 static void power_well_enable(void)
 {
 	gtt_write(HSW_PWR_WELL_CTL1, HSW_PWR_WELL_ENABLE);
@@ -527,7 +540,7 @@ gma_write_acpi_tables(struct device *const dev,
 	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
 	if (gnvs) {
 		/* IGD OpRegion Base Address */
-		gnvs->aslb = (u32)(uintptr_t)opregion;
+		gma_set_gnvs_aslb(gnvs, (uintptr_t)opregion);
 	} else {
 		printk(BIOS_ERR, "Error: GNVS table not found.\n");
 	}

src/northbridge/intel/nehalem/gma.c

@@ -304,6 +304,19 @@ int gtt_poll(u32 reg, u32 mask, u32 value)
 	return 0;
 }
 
+uintptr_t gma_get_gnvs_aslb(const void *gnvs)
+{
+	const global_nvs_t *gnvs_ptr = gnvs;
+	return (uintptr_t)(gnvs_ptr ? gnvs_ptr->aslb : 0);
+}
+
+void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb)
+{
+	global_nvs_t *gnvs_ptr = gnvs;
+	if (gnvs_ptr)
+		gnvs_ptr->aslb = aslb;
+}
+
 static void gma_pm_init_pre_vbios(struct device *dev)
 {
 	u32 reg32;
@@ -1136,7 +1149,7 @@ gma_write_acpi_tables(struct device *const dev,
 	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
 	if (gnvs) {
 		/* IGD OpRegion Base Address */
-		gnvs->aslb = (u32)(uintptr_t)opregion;
+		gma_set_gnvs_aslb(gnvs, (uintptr_t)opregion);
 	} else {
 		printk(BIOS_ERR, "Error: GNVS table not found.\n");
 	}

src/northbridge/intel/sandybridge/gma.c

@@ -311,6 +311,19 @@ int gtt_poll(u32 reg, u32 mask, u32 value)
 	return 0;
 }
 
+uintptr_t gma_get_gnvs_aslb(const void *gnvs)
+{
+	const global_nvs_t *gnvs_ptr = gnvs;
+	return (uintptr_t)(gnvs_ptr ? gnvs_ptr->aslb : 0);
+}
+
+void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb)
+{
+	global_nvs_t *gnvs_ptr = gnvs;
+	if (gnvs_ptr)
+		gnvs_ptr->aslb = aslb;
+}
+
 static void gma_pm_init_pre_vbios(struct device *dev)
 {
 	u32 reg32;
@@ -689,7 +702,7 @@ gma_write_acpi_tables(struct device *const dev,
 	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
 	if (gnvs) {
 		/* IGD OpRegion Base Address */
-		gnvs->aslb = (u32)(uintptr_t)opregion;
+		gma_set_gnvs_aslb(gnvs, (uintptr_t)opregion);
 	} else {
 		printk(BIOS_ERR, "Error: GNVS table not found.\n");
 	}