ACPI: Clean up GNVS initialisation

With the common <soc/nvs.h> approach platform does not
need to implement the common accessors or sizeof() function.

Change-Id: I1050a252f765c763c1ae2d1610cbfb0d973ba026
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49793
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/acpi/Makefile.inc

@@ -10,8 +10,7 @@ ramstage-y += acpigen_ps2_keybd.c
 ramstage-y += acpigen_usb.c
 ramstage-y += device.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos-gnvs.c
-ramstage-y += gnvs.c
-ramstage-$(CONFIG_ACPI_SOC_NVS) += nvs.c
+ramstage-$(CONFIG_ACPI_SOC_NVS) += gnvs.c
 ramstage-y += pld.c
 ramstage-y += sata.c
 ramstage-y += soundwire.c

src/acpi/acpi.c

@@ -1473,6 +1473,7 @@ unsigned long write_acpi_tables(unsigned long start)
 
 		acpigen_set_current((char *) current);
 
+		if (CONFIG(ACPI_SOC_NVS))
 			acpi_fill_gnvs();
 
 		for (dev = all_devices; dev; dev = dev->next)

src/acpi/gnvs.c

@@ -4,11 +4,13 @@
 #include <acpi/acpigen.h>
 #include <cbmem.h>
 #include <console/console.h>
+#include <soc/nvs.h>
+#include <stdint.h>
 #include <string.h>
 #include <types.h>
 #include <vendorcode/google/chromeos/gnvs.h>
 
-static void *gnvs;
+static struct global_nvs *gnvs;
 
 void *acpi_get_gnvs(void)
 {
@@ -23,38 +25,18 @@ void *acpi_get_gnvs(void)
 	return NULL;
 }
 
-static void gnvs_assign_cbmc(void)
-{
-	uint32_t *gnvs_cbmc = gnvs_cbmc_ptr(gnvs);
-	if (gnvs_cbmc)
-		*gnvs_cbmc = (uintptr_t)cbmem_find(CBMEM_ID_CONSOLE);
-}
-
-/* Needs implementation in platform code. */
-__weak uint32_t *gnvs_cbmc_ptr(struct global_nvs *gnvs_)
-{
-	return NULL;
-}
-
 __weak void soc_fill_gnvs(struct global_nvs *gnvs_) { }
 __weak void mainboard_fill_gnvs(struct global_nvs *gnvs_) { }
 
-void *gnvs_get_or_create(void)
+void acpi_create_gnvs(void)
 {
 	size_t gnvs_size;
 
-	if (gnvs)
-		return gnvs;
-
-	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
-	if (gnvs)
-		return gnvs;
-
-	gnvs_size = gnvs_size_of_array();
-	if (!gnvs_size)
-		return NULL;
+	if (cbmem_find(CBMEM_ID_ACPI_GNVS))
+		return;
 
 	/* Match with OpRegion declared in global_nvs.asl. */
+	gnvs_size = sizeof(struct global_nvs);
 	if (gnvs_size < 0x100)
 		gnvs_size = 0x100;
 	if (gnvs_size > 0x1000)
@@ -64,17 +46,15 @@ void *gnvs_get_or_create(void)
 
 	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, gnvs_size);
 	if (!gnvs)
-		return NULL;
+		return;
 
 	memset(gnvs, 0, gnvs_size);
 
 	if (CONFIG(CONSOLE_CBMEM))
-		gnvs_assign_cbmc();
+		gnvs->cbmc = (uintptr_t)cbmem_find(CBMEM_ID_CONSOLE);
 
 	if (CONFIG(CHROMEOS))
 		gnvs_assign_chromeos((u8 *)gnvs + GNVS_CHROMEOS_ACPI_OFFSET);
-
-	return gnvs;
 }
 
 void acpi_fill_gnvs(void)

src/acpi/nvs.c

@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#include <acpi/acpi_gnvs.h>
-#include <soc/nvs.h>
-#include <stdint.h>
-
-size_t gnvs_size_of_array(void)
-{
-	return sizeof(struct global_nvs);
-}
-
-uint32_t *gnvs_cbmc_ptr(struct global_nvs *gnvs)
-{
-	return &gnvs->cbmc;
-}

src/include/acpi/acpi_gnvs.h

@@ -5,22 +5,22 @@
 
 #include <types.h>
 
+void acpi_create_gnvs(void);
+#if CONFIG(ACPI_SOC_NVS)
 void *acpi_get_gnvs(void);
-void *gnvs_get_or_create(void);
+#else
+static inline void *acpi_get_gnvs(void) { return NULL; }
+#endif
 
 void gnvs_assign_chromeos(void *gnvs_section);
 void gnvs_set_ecfw_rw(void);
 
-/* Platform code must implement these. */
-struct global_nvs;
-size_t gnvs_size_of_array(void);
-uint32_t *gnvs_cbmc_ptr(struct global_nvs *gnvs);
-
 /*
  * These functions populate the gnvs structure in acpi table.
  * Defined as weak in common acpi as gnvs structure definition is
  * chipset specific.
  */
+struct global_nvs;
 void soc_fill_gnvs(struct global_nvs *gnvs);
 void mainboard_fill_gnvs(struct global_nvs *gnvs);
 

src/lib/hardwaremain.c

@@ -450,7 +450,7 @@ void main(void)
 
 	/* Initialise GNVS early. */
 	if (CONFIG(ACPI_SOC_NVS))
-		gnvs_get_or_create();
+		acpi_create_gnvs();
 
 	/* Schedule the static boot state entries. */
 	boot_state_schedule_static_entries();