acpi: correct the processor devices scope

The ACPI Spec 2.0 states, that Processor declarations should be made
within the ACPI namespace \_SB and not \_PR anymore. \_PR is deprecated
and is removed here.

Additionally add processor scope patching for P-State SSDT created by
AGESA, becasue AGESA creates the tables with processors in \_PR scope.

TEST=boot Debian Linux on PC Engines apu2, check dmesg that there are
no errors, decompile ACPI tables with acpica to check whether the
processor scope is correct and if IASL does not complain on wrong
checksum, run FWTS

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Change-Id: I35f112e9f9f15f06ddb83b4192f082f9e51a969c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39698
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

6 files changed, 98 insertions, 0 deletions

diff --git a/src/northbridge/amd/agesa/family14/northbridge.c b/src/northbridge/amd/agesa/family14/northbridge.c
index 4086173d7e..1ac5a69cf9 100644
--- a/src/northbridge/amd/agesa/family14/northbridge.c
+++ b/src/northbridge/amd/agesa/family14/northbridge.c
@@ -710,6 +710,21 @@ static unsigned long acpi_fill_hest(acpi_hest_t *hest)
 	return (unsigned long)current;
 }
 
+static void patch_ssdt_processor_scope(acpi_header_t *ssdt)
+{
+	unsigned int len = ssdt->length - sizeof(acpi_header_t);
+	unsigned int i;
+
+	for (i = sizeof(acpi_header_t); i < len; i++) {
+		/* Search for _PR_ scope and replace it with _SB_ */
+		if (*(uint32_t *)((unsigned long)ssdt + i) == 0x5f52505f)
+			*(uint32_t *)((unsigned long)ssdt + i) = 0x5f42535f;
+	}
+	/* Recalculate checksum */
+	ssdt->checksum = 0;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
+
 static unsigned long agesa_write_acpi_tables(struct device *device,
 					     unsigned long current,
 					     acpi_rsdp_t *rsdp)
@@ -774,6 +789,9 @@ static unsigned long agesa_write_acpi_tables(struct device *device,
 	printk(BIOS_DEBUG, "ACPI:  * AGESA SSDT Pstate at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
+		hexdump(ssdt, ssdt->length);
+		patch_ssdt_processor_scope(ssdt);
+		hexdump(ssdt, ssdt->length);
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;
diff --git a/src/northbridge/amd/agesa/family15tn/northbridge.c b/src/northbridge/amd/agesa/family15tn/northbridge.c
index 642fc150e1..a62e12e772 100644
--- a/src/northbridge/amd/agesa/family15tn/northbridge.c
+++ b/src/northbridge/amd/agesa/family15tn/northbridge.c
@@ -449,6 +449,21 @@ static void northbridge_fill_ssdt_generator(struct device *device)
 	acpigen_pop_len();
 }
 
+static void patch_ssdt_processor_scope(acpi_header_t *ssdt)
+{
+	unsigned int len = ssdt->length - sizeof(acpi_header_t);
+	unsigned int i;
+
+	for (i = sizeof(acpi_header_t); i < len; i++) {
+		/* Search for _PR_ scope and replace it with _SB_ */
+		if (*(uint32_t *)((unsigned long)ssdt + i) == 0x5f52505f)
+			*(uint32_t *)((unsigned long)ssdt + i) = 0x5f42535f;
+	}
+	/* Recalculate checksum */
+	ssdt->checksum = 0;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
+
 static unsigned long agesa_write_acpi_tables(struct device *device,
 					     unsigned long current,
 					     acpi_rsdp_t *rsdp)
@@ -525,6 +540,7 @@ static unsigned long agesa_write_acpi_tables(struct device *device,
 	printk(BIOS_DEBUG, "ACPI:    * SSDT at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
+		patch_ssdt_processor_scope(ssdt);
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;
diff --git a/src/northbridge/amd/agesa/family16kb/northbridge.c b/src/northbridge/amd/agesa/family16kb/northbridge.c
index fcd7ec1fe6..2cdcb58023 100644
--- a/src/northbridge/amd/agesa/family16kb/northbridge.c
+++ b/src/northbridge/amd/agesa/family16kb/northbridge.c
@@ -449,6 +449,21 @@ static void northbridge_fill_ssdt_generator(struct device *device)
 	acpigen_pop_len();
 }
 
+static void patch_ssdt_processor_scope(acpi_header_t *ssdt)
+{
+	unsigned int len = ssdt->length - sizeof(acpi_header_t);
+	unsigned int i;
+
+	for (i = sizeof(acpi_header_t); i < len; i++) {
+		/* Search for _PR_ scope and replace it with _SB_ */
+		if (*(uint32_t *)((unsigned long)ssdt + i) == 0x5f52505f)
+			*(uint32_t *)((unsigned long)ssdt + i) = 0x5f42535f;
+	}
+	/* Recalculate checksum */
+	ssdt->checksum = 0;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
+
 static unsigned long agesa_write_acpi_tables(struct device *device,
 					     unsigned long current,
 					     acpi_rsdp_t *rsdp)
@@ -525,6 +540,7 @@ static unsigned long agesa_write_acpi_tables(struct device *device,
 	printk(BIOS_DEBUG, "ACPI:    * SSDT at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
+		patch_ssdt_processor_scope(ssdt);
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;
diff --git a/src/northbridge/amd/pi/00630F01/northbridge.c b/src/northbridge/amd/pi/00630F01/northbridge.c
index 28502b0017..e90848a36b 100644
--- a/src/northbridge/amd/pi/00630F01/northbridge.c
+++ b/src/northbridge/amd/pi/00630F01/northbridge.c
@@ -447,6 +447,21 @@ static void northbridge_fill_ssdt_generator(struct device *device)
 	acpigen_pop_len();
 }
 
+static void patch_ssdt_processor_scope(acpi_header_t *ssdt)
+{
+	unsigned int len = ssdt->length - sizeof(acpi_header_t);
+	unsigned int i;
+
+	for (i = sizeof(acpi_header_t); i < len; i++) {
+		/* Search for _PR_ scope and replace it with _SB_ */
+		if (*(uint32_t *)((unsigned long)ssdt + i) == 0x5f52505f)
+			*(uint32_t *)((unsigned long)ssdt + i) = 0x5f42535f;
+	}
+	/* Recalculate checksum */
+	ssdt->checksum = 0;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
+
 static unsigned long agesa_write_acpi_tables(struct device *device,
 					     unsigned long current,
 					     acpi_rsdp_t *rsdp)
@@ -521,6 +536,7 @@ static unsigned long agesa_write_acpi_tables(struct device *device,
 	printk(BIOS_DEBUG, "ACPI:    * SSDT at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
+		patch_ssdt_processor_scope(ssdt);
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;
diff --git a/src/northbridge/amd/pi/00660F01/northbridge.c b/src/northbridge/amd/pi/00660F01/northbridge.c
index 0a1b0ba1a4..200508617c 100644
--- a/src/northbridge/amd/pi/00660F01/northbridge.c
+++ b/src/northbridge/amd/pi/00660F01/northbridge.c
@@ -435,6 +435,21 @@ static void northbridge_fill_ssdt_generator(struct device *device)
 	acpigen_pop_len();
 }
 
+static void patch_ssdt_processor_scope(acpi_header_t *ssdt)
+{
+	unsigned int len = ssdt->length - sizeof(acpi_header_t);
+	unsigned int i;
+
+	for (i = sizeof(acpi_header_t); i < len; i++) {
+		/* Search for _PR_ scope and replace it with _SB_ */
+		if (*(uint32_t *)((unsigned long)ssdt + i) == 0x5f52505f)
+			*(uint32_t *)((unsigned long)ssdt + i) = 0x5f42535f;
+	}
+	/* Recalculate checksum */
+	ssdt->checksum = 0;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
+
 static unsigned long agesa_write_acpi_tables(struct device *device,
 					     unsigned long current,
 					     acpi_rsdp_t *rsdp)
@@ -511,6 +526,7 @@ static unsigned long agesa_write_acpi_tables(struct device *device,
 	printk(BIOS_DEBUG, "ACPI:    * SSDT at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
+		patch_ssdt_processor_scope(ssdt);
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;
diff --git a/src/northbridge/amd/pi/00730F01/northbridge.c b/src/northbridge/amd/pi/00730F01/northbridge.c
index c87d8fffba..f611bd6e3e 100644
--- a/src/northbridge/amd/pi/00730F01/northbridge.c
+++ b/src/northbridge/amd/pi/00730F01/northbridge.c
@@ -671,6 +671,21 @@ static void northbridge_fill_ssdt_generator(struct device *device)
 	acpigen_pop_len();
 }
 
+static void patch_ssdt_processor_scope(acpi_header_t *ssdt)
+{
+	unsigned int len = ssdt->length - sizeof(acpi_header_t);
+	unsigned int i;
+
+	for (i = sizeof(acpi_header_t); i < len; i++) {
+		/* Search for _PR_ scope and replace it with _SB_ */
+		if (*(uint32_t *)((unsigned long)ssdt + i) == 0x5f52505f)
+			*(uint32_t *)((unsigned long)ssdt + i) = 0x5f42535f;
+	}
+	/* Recalculate checksum */
+	ssdt->checksum = 0;
+	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
+}
+
 static unsigned long agesa_write_acpi_tables(struct device *device,
 					     unsigned long current,
 					     acpi_rsdp_t *rsdp)
@@ -741,6 +756,7 @@ static unsigned long agesa_write_acpi_tables(struct device *device,
 	printk(BIOS_DEBUG, "ACPI:    * SSDT at %lx\n", current);
 	ssdt = (acpi_header_t *)agesawrapper_getlateinitptr (PICK_PSTATE);
 	if (ssdt != NULL) {
+		patch_ssdt_processor_scope(ssdt);
 		memcpy((void *)current, ssdt, ssdt->length);
 		ssdt = (acpi_header_t *) current;
 		current += ssdt->length;