acpi: Move MCFG implementation to common lib

MCFG tables are used on multiple arches. Move to common ACPI lib.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Moritz Fischer <moritzf@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Use sizeof(*mcfg) instead of sizeof(*header)
Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/intel_common/acpi.c

@@ -31,14 +31,17 @@
 #include <linux/err.h>
 #include <power/acpi_pmc.h>
 
-u32 acpi_fill_mcfg(u32 current)
+int acpi_fill_mcfg(struct acpi_ctx *ctx)
 {
+	size_t size;
+
 	/* PCI Segment Group 0, Start Bus Number 0, End Bus Number is 255 */
-	current += acpi_create_mcfg_mmconfig((void *)current,
-					     CONFIG_MMCONF_BASE_ADDRESS, 0, 0,
-					     (CONFIG_SA_PCIEX_LENGTH >> 20)
-					     - 1);
-	return current;
+	size = acpi_create_mcfg_mmconfig((void *)ctx->current,
+					 CONFIG_MMCONF_BASE_ADDRESS, 0, 0,
+					 (CONFIG_SA_PCIEX_LENGTH >> 20) - 1);
+	acpi_inc(ctx, size);
+
+	return 0;
 }
 
 static int acpi_sci_irq(void)

arch/x86/cpu/tangier/acpi.c

@@ -68,14 +68,17 @@ u32 acpi_fill_madt(u32 current)
 	return current;
 }
 
-u32 acpi_fill_mcfg(u32 current)
+int acpi_fill_mcfg(struct acpi_ctx *ctx)
 {
+	size_t size;
+
 	/* TODO: Derive parameters from SFI MCFG table */
-	current += acpi_create_mcfg_mmconfig
-		((struct acpi_mcfg_mmconfig *)current,
+	size = acpi_create_mcfg_mmconfig
+		((struct acpi_mcfg_mmconfig *)ctx->current,
 		MCFG_BASE_ADDRESS, 0x0, 0x0, 0x0);
+	acpi_inc(ctx, size);
 
-	return current;
+	return 0;
 }
 
 static u32 acpi_fill_csrt_dma(struct acpi_csrt_group *grp)

arch/x86/include/asm/acpi_table.h

@@ -34,7 +34,6 @@ int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
 u32 acpi_fill_madt(u32 current);
 int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
 			      u16 seg_nr, u8 start, u8 end);
-u32 acpi_fill_mcfg(u32 current);
 
 /**
  * acpi_write_hpet() - Write out a HPET table

arch/x86/lib/acpi_table.c

@@ -161,28 +161,6 @@ int acpi_write_madt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
 }
 ACPI_WRITER(5x86, NULL, acpi_write_madt, 0);
 
-int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
-			      u16 seg_nr, u8 start, u8 end)
-{
-	memset(mmconfig, 0, sizeof(*mmconfig));
-	mmconfig->base_address_l = base;
-	mmconfig->base_address_h = 0;
-	mmconfig->pci_segment_group_number = seg_nr;
-	mmconfig->start_bus_number = start;
-	mmconfig->end_bus_number = end;
-
-	return sizeof(struct acpi_mcfg_mmconfig);
-}
-
-__weak u32 acpi_fill_mcfg(u32 current)
-{
-	current += acpi_create_mcfg_mmconfig
-		((struct acpi_mcfg_mmconfig *)current,
-		CONFIG_PCIE_ECAM_BASE, 0x0, 0x0, 255);
-
-	return current;
-}
-
 /**
  * acpi_create_tcpa() - Create a TCPA table
  *
@@ -480,38 +458,6 @@ int acpi_write_gnvs(struct acpi_ctx *ctx, const struct acpi_writer *entry)
 }
 ACPI_WRITER(4gnvs, "GNVS", acpi_write_gnvs, 0);
 
-/* MCFG is defined in the PCI Firmware Specification 3.0 */
-int acpi_write_mcfg(struct acpi_ctx *ctx, const struct acpi_writer *entry)
-{
-	struct acpi_table_header *header;
-	struct acpi_mcfg *mcfg;
-	u32 current;
-
-	mcfg = ctx->current;
-	header = &mcfg->header;
-
-	current = (u32)mcfg + sizeof(struct acpi_mcfg);
-
-	memset(mcfg, '\0', sizeof(struct acpi_mcfg));
-
-	/* Fill out header fields */
-	acpi_fill_header(header, "MCFG");
-	header->length = sizeof(struct acpi_mcfg);
-	header->revision = 1;
-
-	current = acpi_fill_mcfg(current);
-
-	/* (Re)calculate length and checksum */
-	header->length = current - (u32)mcfg;
-	header->checksum = table_compute_checksum(mcfg, header->length);
-
-	acpi_inc(ctx, mcfg->header.length);
-	acpi_add_table(ctx, mcfg);
-
-	return 0;
-}
-ACPI_WRITER(5mcfg, "MCFG", acpi_write_mcfg, 0);
-
 /**
  * acpi_write_hpet() - Write out a HPET table
  *

lib/acpi/Makefile

@@ -11,6 +11,7 @@ obj-y += acpi_writer.o
 ifndef CONFIG_QEMU
 obj-y += base.o
 obj-y += csrt.o
+obj-y += mcfg.o
 
 # Sandbox does not build a .asl file
 ifndef CONFIG_SANDBOX

lib/acpi/mcfg.c

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Write an ACPI MCFG table
+ *
+ * Copyright 2022 Google LLC
+ */
+
+#define LOG_CATEGORY LOGC_ACPI
+
+#include <common.h>
+#include <mapmem.h>
+#include <tables_csum.h>
+#include <acpi/acpi_table.h>
+#include <dm/acpi.h>
+
+int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
+			      u16 seg_nr, u8 start, u8 end)
+{
+	memset(mmconfig, 0, sizeof(*mmconfig));
+	mmconfig->base_address_l = base;
+	mmconfig->base_address_h = 0;
+	mmconfig->pci_segment_group_number = seg_nr;
+	mmconfig->start_bus_number = start;
+	mmconfig->end_bus_number = end;
+
+	return sizeof(struct acpi_mcfg_mmconfig);
+}
+
+__weak int acpi_fill_mcfg(struct acpi_ctx *ctx)
+{
+	return -ENOENT;
+}
+
+/* MCFG is defined in the PCI Firmware Specification 3.0 */
+int acpi_write_mcfg(struct acpi_ctx *ctx, const struct acpi_writer *entry)
+{
+	struct acpi_table_header *header;
+	struct acpi_mcfg *mcfg;
+	int ret;
+
+	mcfg = ctx->current;
+	header = &mcfg->header;
+
+	memset(mcfg, '\0', sizeof(struct acpi_mcfg));
+
+	/* Fill out header fields */
+	acpi_fill_header(header, "MCFG");
+	header->length = sizeof(struct acpi_mcfg);
+	header->revision = 1;
+	acpi_inc(ctx, sizeof(*mcfg));
+
+	ret = acpi_fill_mcfg(ctx);
+	if (ret)
+		return log_msg_ret("fill", ret);
+
+	/* (Re)calculate length and checksum */
+	header->length = (ulong)ctx->current - (ulong)mcfg;
+	header->checksum = table_compute_checksum(mcfg, header->length);
+
+	acpi_add_table(ctx, mcfg);
+
+	return 0;
+}
+ACPI_WRITER(5mcfg, "MCFG", acpi_write_mcfg, 0);