arm: acpi: Add generic ACPI methods

Add generic ACPI code to generate
- MADT GICC
- MADT GICD
- MADT GICR
- MADT GIC ITS
- PPTT processor
- PPTT cache

as commonly used on arm platforms.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>

2 files changed, 115 insertions, 0 deletions

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 67275fba616..a7efed6771d 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -86,6 +86,7 @@ obj-y	+= psci-dt.o
 obj-$(CONFIG_DEBUG_LL)	+= debug.o
 
 obj-$(CONFIG_BLOBLIST)  += xferlist.o
+obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi_table.o
 
 # For EABI conformant tool chains, provide eabi_compat()
 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
diff --git a/arch/arm/lib/acpi_table.c b/arch/arm/lib/acpi_table.c
new file mode 100644
index 00000000000..286ed7cecaa
--- /dev/null
+++ b/arch/arm/lib/acpi_table.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Based on acpi.c from coreboot
+ *
+ * Copyright (C) 2024 9elements GmbH
+ */
+
+#define LOG_CATEGORY LOGC_ACPI
+
+#include <string.h>
+#include <acpi/acpigen.h>
+#include <acpi/acpi_device.h>
+#include <acpi/acpi_table.h>
+
+void acpi_write_madt_gicc(struct acpi_madt_gicc *gicc, uint cpu_num,
+			  uint perf_gsiv, ulong phys_base, ulong gicv,
+			  ulong gich, uint vgic_maint_irq, u64 gicr_base,
+			  ulong mpidr, uint efficiency)
+{
+	memset(gicc, '\0', sizeof(struct acpi_madt_gicc));
+	gicc->type = ACPI_APIC_GICC;
+	gicc->length = sizeof(struct acpi_madt_gicc);
+	gicc->cpu_if_num = cpu_num;
+	gicc->processor_id = cpu_num;
+	gicc->flags = ACPI_MADTF_ENABLED;
+	gicc->perf_gsiv = perf_gsiv;
+	gicc->phys_base = phys_base;
+	gicc->gicv = gicv;
+	gicc->gich = gich;
+	gicc->vgic_maint_irq = vgic_maint_irq;
+	gicc->gicr_base = gicr_base;
+	gicc->mpidr = mpidr;
+	gicc->efficiency = efficiency;
+}
+
+void acpi_write_madt_gicd(struct acpi_madt_gicd *gicd, uint gic_id,
+			  ulong phys_base, uint gic_version)
+{
+	memset(gicd, '\0', sizeof(struct acpi_madt_gicd));
+	gicd->type = ACPI_APIC_GICD;
+	gicd->length = sizeof(struct acpi_madt_gicd);
+	gicd->gic_id = gic_id;
+	gicd->phys_base = phys_base;
+	gicd->gic_version = gic_version;
+}
+
+void acpi_write_madt_gicr(struct acpi_madt_gicr *gicr,
+			  u64 discovery_range_base_address,
+			  u32 discovery_range_length)
+{
+	memset(gicr, '\0', sizeof(struct acpi_madt_gicr));
+	gicr->type = ACPI_APIC_GICR;
+	gicr->length = sizeof(struct acpi_madt_gicr);
+	gicr->discovery_range_base_address = discovery_range_base_address;
+	gicr->discovery_range_length = discovery_range_length;
+}
+
+void acpi_write_madt_its(struct acpi_madt_its *its,
+			 u32 its_id,
+			 u64 physical_base_address)
+{
+	memset(its, '\0', sizeof(struct acpi_madt_its));
+	its->type = ACPI_APIC_ITS;
+	its->length = sizeof(struct acpi_madt_its);
+	its->gic_its_id = its_id;
+	its->physical_base_address = physical_base_address;
+}
+
+int acpi_pptt_add_proc(struct acpi_ctx *ctx, const u32 flags, const u32 parent,
+		       const u32 proc_id, const u32 num_resources,
+		       const u32 *resource_list)
+{
+	struct acpi_pptt_proc *proc = ctx->current;
+	int offset;
+
+	offset = ctx->current - ctx->tab_start;
+	proc->hdr.type = ACPI_PPTT_TYPE_PROC;
+	proc->flags = flags;
+	proc->parent = parent;
+	proc->proc_id = proc_id;
+	proc->num_resources = num_resources;
+	proc->hdr.length = sizeof(struct acpi_pptt_proc) +
+		sizeof(u32) * num_resources;
+
+	if (resource_list)
+		memcpy(proc + 1, resource_list, sizeof(u32) * num_resources);
+
+	acpi_inc(ctx, proc->hdr.length);
+
+	return offset;
+}
+
+int acpi_pptt_add_cache(struct acpi_ctx *ctx, const u32 flags,
+			const u32 next_cache_level, const u32 size,
+			const u32 sets, const u8 assoc, const u8 attributes,
+			const u16 line_size)
+{
+	struct acpi_pptt_cache *cache = ctx->current;
+	int offset;
+
+	offset = ctx->current - ctx->tab_start;
+	cache->hdr.type = ACPI_PPTT_TYPE_CACHE;
+	cache->hdr.length = sizeof(struct acpi_pptt_cache);
+	cache->flags = flags;
+	cache->next_cache_level = next_cache_level;
+	cache->size = size;
+	cache->sets = sets;
+	cache->assoc = assoc;
+	cache->attributes = attributes;
+	cache->line_size = line_size;
+	acpi_inc(ctx, cache->hdr.length);
+
+	return offset;
+}