soc/amd/cezanne: add partial data fabric setup

I'm not 100% sure yet if this code will be common for all AMD SoCs, so
I'll add a copy for Cezanne for now. This part of the code should
probably be reworked after the initial bringup of Cezanne anyway.

DF MMIO register configuration at the beginning of
data_fabric_set_mmio_np:

=== Data Fabric MMIO configuration registers ===
Addresses are shifted to the right by 16 bits.
idx  control     base    limit
  0       a3     fc00     febf
  1       a3  1000000 fffcffff
  2       a3     d000     f7ff
  3       a0        0        0
  4       a3     fed0     fed0
  5       a0        0        0
  6       a0        0        0
  7       a0        0        0

DF MMIO register configuration at the end of data_fabric_set_mmio_np:

=== Data Fabric MMIO configuration registers ===
Addresses are shifted to the right by 16 bits.
idx  control     base    limit
  0       a3     fc00     febf
  1       a3  1000000 fffcffff
  2       a3     d000     f7ff
  3     10a3     fed0     fedf
  4       a0        0        0
  5       a0        0        0
  6       a0        0        0
  7       a0        0        0

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ia243a0cad311eb210d14d6242c52f599db22515c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50624
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

5 files changed, 114 insertions, 0 deletions

diff --git a/src/soc/amd/cezanne/Kconfig b/src/soc/amd/cezanne/Kconfig
index 9e5209f50e..9dafe2cdb3 100644
--- a/src/soc/amd/cezanne/Kconfig
+++ b/src/soc/amd/cezanne/Kconfig
@@ -29,6 +29,7 @@ config SOC_SPECIFIC_OPTIONS
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO
 	select SOC_AMD_COMMON_BLOCK_AOAC
 	select SOC_AMD_COMMON_BLOCK_BANKED_GPIOS
+	select SOC_AMD_COMMON_BLOCK_DATA_FABRIC
 	select SOC_AMD_COMMON_BLOCK_LPC
 	select SOC_AMD_COMMON_BLOCK_NONCAR
 	select SOC_AMD_COMMON_BLOCK_PCI
diff --git a/src/soc/amd/cezanne/Makefile.inc b/src/soc/amd/cezanne/Makefile.inc
index d395089242..697d412464 100644
--- a/src/soc/amd/cezanne/Makefile.inc
+++ b/src/soc/amd/cezanne/Makefile.inc
@@ -27,6 +27,7 @@ romstage-y	+= uart.c
 ramstage-y	+= acpi.c
 ramstage-y	+= chip.c
 ramstage-y	+= cpu.c
+ramstage-y	+= data_fabric.c
 ramstage-y	+= fch.c
 ramstage-y	+= fsp_params.c
 ramstage-y	+= gpio.c
diff --git a/src/soc/amd/cezanne/chip.c b/src/soc/amd/cezanne/chip.c
index ffd56de66d..78a4e33d76 100644
--- a/src/soc/amd/cezanne/chip.c
+++ b/src/soc/amd/cezanne/chip.c
@@ -2,6 +2,7 @@
 
 #include <device/device.h>
 #include <fsp/api.h>
+#include <soc/data_fabric.h>
 #include <soc/southbridge.h>
 #include <types.h>
 #include "chip.h"
@@ -53,6 +54,8 @@ static void soc_init(void *chip_info)
 {
 	fsp_silicon_init();
 
+	data_fabric_set_mmio_np();
+
 	fch_init(chip_info);
 }
 
diff --git a/src/soc/amd/cezanne/data_fabric.c b/src/soc/amd/cezanne/data_fabric.c
new file mode 100644
index 0000000000..b4bf61818b
--- /dev/null
+++ b/src/soc/amd/cezanne/data_fabric.c
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/data_fabric.h>
+#include <console/console.h>
+#include <cpu/x86/lapic_def.h>
+#include <soc/data_fabric.h>
+#include <soc/iomap.h>
+#include <types.h>
+
+void data_fabric_set_mmio_np(void)
+{
+	/*
+	 * Mark region from HPET-LAPIC or 0xfed00000-0xfee00000-1 as NP.
+	 *
+	 * AGESA has already programmed the NB MMIO routing, however nothing
+	 * is yet marked as non-posted.
+	 *
+	 * If there exists an overlapping routing base/limit pair, trim its
+	 * base or limit to avoid the new NP region.  If any pair exists
+	 * completely within HPET-LAPIC range, remove it.  If any pair surrounds
+	 * HPET-LAPIC, it must be split into two regions.
+	 *
+	 * TODO(b/156296146): Remove the settings from AGESA and allow coreboot
+	 * to own everything.  If not practical, consider erasing all settings
+	 * and have coreboot reprogram them.  At that time, make the source
+	 * below more flexible.
+	 *   * Note that the code relies on the granularity of the HPET and
+	 *     LAPIC addresses being sufficiently large that the shifted limits
+	 *     +/-1 are always equivalent to the non-shifted values +/-1.
+	 */
+
+	unsigned int i;
+	int reg;
+	uint32_t base, limit, ctrl;
+	const uint32_t np_bot = HPET_BASE_ADDRESS >> D18F0_MMIO_SHIFT;
+	const uint32_t np_top = (LOCAL_APIC_ADDR - 1) >> D18F0_MMIO_SHIFT;
+
+	data_fabric_print_mmio_conf();
+
+	for (i = 0; i < NUM_NB_MMIO_REGS; i++) {
+		/* Adjust all registers that overlap */
+		ctrl = data_fabric_broadcast_read32(0, NB_MMIO_CONTROL(i));
+		if (!(ctrl & (MMIO_WE | MMIO_RE)))
+			continue; /* not enabled */
+
+		base = data_fabric_broadcast_read32(0, NB_MMIO_BASE(i));
+		limit = data_fabric_broadcast_read32(0, NB_MMIO_LIMIT(i));
+
+		if (base > np_top || limit < np_bot)
+			continue; /* no overlap at all */
+
+		if (base >= np_bot && limit <= np_top) {
+			data_fabric_disable_mmio_reg(i); /* 100% within, so remove */
+			continue;
+		}
+
+		if (base < np_bot && limit > np_top) {
+			/* Split the configured region */
+			data_fabric_broadcast_write32(0, NB_MMIO_LIMIT(i), np_bot - 1);
+			reg = data_fabric_find_unused_mmio_reg();
+			if (reg < 0) {
+				/* Although a pair could be freed later, this condition is
+				 * very unusual and deserves analysis.  Flag an error and
+				 * leave the topmost part unconfigured. */
+				printk(BIOS_ERR,
+				       "Error: Not enough NB MMIO routing registers\n");
+				continue;
+			}
+			data_fabric_broadcast_write32(0, NB_MMIO_BASE(reg), np_top + 1);
+			data_fabric_broadcast_write32(0, NB_MMIO_LIMIT(reg), limit);
+			data_fabric_broadcast_write32(0, NB_MMIO_CONTROL(reg), ctrl);
+			continue;
+		}
+
+		/* If still here, adjust only the base or limit */
+		if (base <= np_bot)
+			data_fabric_broadcast_write32(0, NB_MMIO_LIMIT(i), np_bot - 1);
+		else
+			data_fabric_broadcast_write32(0, NB_MMIO_BASE(i), np_top + 1);
+	}
+
+	reg = data_fabric_find_unused_mmio_reg();
+	if (reg < 0) {
+		printk(BIOS_ERR, "Error: cannot configure region as NP\n");
+		return;
+	}
+
+	data_fabric_broadcast_write32(0, NB_MMIO_BASE(reg), np_bot);
+	data_fabric_broadcast_write32(0, NB_MMIO_LIMIT(reg), np_top);
+	data_fabric_broadcast_write32(0, NB_MMIO_CONTROL(reg),
+			   (IOMS0_FABRIC_ID << MMIO_DST_FABRIC_ID_SHIFT) | MMIO_NP | MMIO_WE
+				   | MMIO_RE);
+
+	data_fabric_print_mmio_conf();
+}
diff --git a/src/soc/amd/cezanne/include/soc/data_fabric.h b/src/soc/amd/cezanne/include/soc/data_fabric.h
new file mode 100644
index 0000000000..5dcbdd07ce
--- /dev/null
+++ b/src/soc/amd/cezanne/include/soc/data_fabric.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef AMD_CEZANNE_DATA_FABRIC_H
+#define AMD_CEZANNE_DATA_FABRIC_H
+
+#include <types.h>
+
+#define IOMS0_FABRIC_ID			10
+
+#define NUM_NB_MMIO_REGS		8
+
+void data_fabric_set_mmio_np(void);
+
+#endif /* AMD_CEZANNE_DATA_FABRIC_H */