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soc/amd: Move root complex SSDT TOM1/TOM2 generation function

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This will also be used for cezanne. Stoney also has a similar function,
but it hard codes the scope path. I didn't have a device setup to test
if switching to this function was a no-op. So I left it.

TOM2 isn't used by any ASL, so we could remove it later.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I7c8f476a7735fea61a3244b97988e3ead3b42e79
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50892
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Raul E Rangel
2021-02-18 16:36:08 -07:00
committed by Patrick Georgi
parent bde284b585
commit 58a8ad1661
3 changed files with 34 additions and 24 deletions
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26
src/soc/amd/picasso/root_complex.c
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <amdblocks/acpi.h>
#include <amdblocks/memmap.h>
#include <amdblocks/ioapic.h>
#include <arch/ioapic.h>
@ -8,7 +9,6 @@
#include <cbmem.h>
#include <console/console.h>
#include <cpu/amd/msr.h>
#include <cpu/amd/mtrr.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
@ -241,31 +241,9 @@ static void acipgen_dptci(void)
acpigen_pop_len(); /* Scope \_SB */
}
/* Used by \_SB.PCI0._CRS */
static void root_complex_fill_ssdt(const struct device *device)
{
msr_t msr;
const char *scope;
assert(device);
scope = acpi_device_scope(device);
assert(scope);
acpigen_write_scope(scope);
msr = rdmsr(TOP_MEM);
acpigen_write_name_dword("TOM1", msr.lo);
msr = rdmsr(TOP_MEM2);
/*
* Since XP only implements parts of ACPI 2.0, we can't use a qword
* here.
* See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt
* slide 22ff.
* Shift value right by 20 bit to make it fit into 32bit,
* giving us 1MB granularity and a limit of almost 4Exabyte of memory.
*/
acpigen_write_name_dword("TOM2", (msr.hi << 12) | msr.lo >> 20);
acpigen_pop_len();
acpi_fill_root_complex_tom(device);
acipgen_dptci();
}