arm: bcm283x: Generate ACPI tables

Generate SoC specific ACPI tables for BCM2711:
- FADT
- PPTT
- GTDT

Board specific tables like DSDT and SSDT are added in a separate patch.

MADT is already properly generated from the FDT.

When ACPI is enabled for a different SoC compliation will fail by
design, indicating the required functions that needs to be implemented.
When ACPI is not enabled the added code does nothing, keeping existing
behaviour.

TEST: Booted on RPi4 with only ACPI enabled, providing no FDT to the OS.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Matthias Brugger <mbrugger@suse.com>
Cc: Peter Robinson <pbrobinson@gmail.com>
Cc: Tom Rini <trini@konsulko.com>

arch/arm/mach-bcm283x/Makefile

@@ -4,3 +4,7 @@
 
 obj-$(CONFIG_BCM2835) += lowlevel_init.o
 obj-y	+= init.o reset.o mbox.o msg.o phys2bus.o
+
+ifeq ($(CONFIG_GENERATE_ACPI_TABLE),y)
+obj-$(CONFIG_BCM2711) += bcm2711_acpi.o
+endif

arch/arm/mach-bcm283x/bcm2711_acpi.c

@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2024 9elements GmbH
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ */
+
+#include <string.h>
+#include <tables_csum.h>
+#include <acpi/acpi_table.h>
+#include <asm/acpi_table.h>
+#include <asm/armv8/sec_firmware.h>
+#include <asm/arch/acpi/bcm2711.h>
+#include <dm/uclass.h>
+
+void acpi_fill_fadt(struct acpi_fadt *fadt)
+{
+	fadt->flags = ACPI_FADT_HW_REDUCED_ACPI | ACPI_FADT_LOW_PWR_IDLE_S0;
+
+	if (CONFIG_IS_ENABLED(SEC_FIRMWARE_ARMV8_PSCI) &&
+	    sec_firmware_support_psci_version() != PSCI_INVALID_VER)
+		fadt->arm_boot_arch = ACPI_ARM_PSCI_COMPLIANT;
+}
+
+#define L3_ATTRIBUTES (ACPI_PPTT_READ_ALLOC | ACPI_PPTT_WRITE_ALLOC | \
+			(ACPI_PPTT_CACHE_TYPE_UNIFIED << \
+			 ACPI_PPTT_CACHE_TYPE_SHIFT))
+#define L3_SIZE 0x100000
+#define L3_SETS 0x400
+#define L3_WAYS 0x10
+
+#define L1D_ATTRIBUTES (ACPI_PPTT_READ_ALLOC | ACPI_PPTT_WRITE_ALLOC | \
+			(ACPI_PPTT_CACHE_TYPE_DATA << \
+			 ACPI_PPTT_CACHE_TYPE_SHIFT))
+#define L1D_SIZE 0x8000
+#define L1D_SETS 0x100
+#define L1D_WAYS 2
+
+#define L1I_ATTRIBUTES (ACPI_PPTT_READ_ALLOC | \
+			(ACPI_PPTT_CACHE_TYPE_INSTR << \
+			 ACPI_PPTT_CACHE_TYPE_SHIFT))
+#define L1I_SIZE 0xc000
+#define L1I_SETS 0x100
+#define L1I_WAYS 3
+
+static int acpi_write_pptt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
+{
+	struct acpi_table_header *header;
+	int cluster_offset, l3_offset;
+	u32 offsets[2];
+
+	header = ctx->current;
+	ctx->tab_start = ctx->current;
+
+	memset(header, '\0', sizeof(struct acpi_table_header));
+
+	acpi_fill_header(header, "PPTT");
+	header->revision = acpi_get_table_revision(ACPITAB_PPTT);
+	acpi_inc(ctx, sizeof(*header));
+
+	l3_offset = acpi_pptt_add_cache(ctx, ACPI_PPTT_ALL_VALID, 0, L3_SIZE,
+					L3_SETS, L3_WAYS, L3_ATTRIBUTES, 64);
+
+	cluster_offset = acpi_pptt_add_proc(ctx, ACPI_PPTT_PHYSICAL_PACKAGE |
+					    ACPI_PPTT_CHILDREN_IDENTICAL,
+					    0, 0, 1, &l3_offset);
+
+	offsets[0] = acpi_pptt_add_cache(ctx, ACPI_PPTT_ALL_VALID, 0, L1D_SIZE,
+					 L1D_SETS, L1D_WAYS, L1D_ATTRIBUTES, 64);
+
+	offsets[1] = acpi_pptt_add_cache(ctx, ACPI_PPTT_ALL_BUT_WRITE_POL, 0,
+					 L1I_SIZE, L1I_SETS, L1I_WAYS,
+					 L1I_ATTRIBUTES, 64);
+
+	for (int i = 0; i < uclass_id_count(UCLASS_CPU); i++) {
+		acpi_pptt_add_proc(ctx, ACPI_PPTT_CHILDREN_IDENTICAL |
+				   ACPI_PPTT_NODE_IS_LEAF |
+				   ACPI_PPTT_PROC_ID_VALID,
+				   cluster_offset, i, 2, offsets);
+	}
+
+	header->length = ctx->current - ctx->tab_start;
+	header->checksum = table_compute_checksum(header, header->length);
+
+	acpi_inc(ctx, header->length);
+	acpi_add_table(ctx, header);
+
+	return 0;
+};
+
+ACPI_WRITER(5pptt, "PPTT", acpi_write_pptt, 0);
+
+static int rpi_write_gtdt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
+{
+	struct acpi_table_header *header;
+	struct acpi_gtdt *gtdt;
+
+	gtdt = ctx->current;
+	header = &gtdt->header;
+
+	memset(gtdt, '\0', sizeof(struct acpi_gtdt));
+
+	acpi_fill_header(header, "GTDT");
+	header->length = sizeof(struct acpi_gtdt);
+	header->revision = acpi_get_table_revision(ACPITAB_GTDT);
+
+	gtdt->cnt_ctrl_base = BCM2711_ARM_LOCAL_BASE_ADDRESS + 0x1c;
+	gtdt->sec_el1_gsiv = 29;
+	gtdt->sec_el1_flags = GTDT_FLAG_INT_ACTIVE_LOW;
+	gtdt->el1_gsiv = 30;
+	gtdt->el1_flags = GTDT_FLAG_INT_ACTIVE_LOW;
+	gtdt->virt_el1_gsiv = 27;
+	gtdt->virt_el1_flags = GTDT_FLAG_INT_ACTIVE_LOW;
+	gtdt->el2_gsiv = 26;
+	gtdt->el2_flags = GTDT_FLAG_INT_ACTIVE_LOW;
+	gtdt->cnt_read_base = 0xffffffffffffffff;
+
+	header->checksum = table_compute_checksum(header, header->length);
+
+	acpi_add_table(ctx, gtdt);
+
+	acpi_inc(ctx, sizeof(struct acpi_gtdt));
+
+	return 0;
+};
+
+ACPI_WRITER(5gtdt, "GTDT", rpi_write_gtdt, 0);