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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
#include <arch/hpet.h>
#include <console/console.h>
#include <device/mmio.h>
#include <version.h>
/* http://www.intel.com/hardwaredesign/hpetspec_1.pdf */
static void acpi_create_hpet(acpi_hpet_t *hpet)
{
acpi_header_t *header = &(hpet->header);
acpi_addr_t *addr = &(hpet->addr);
memset((void *)hpet, 0, sizeof(acpi_hpet_t));
if (!header)
return;
/* Fill out header fields. */
memcpy(header->signature, "HPET", 4);
memcpy(header->oem_id, OEM_ID, 6);
memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
memcpy(header->asl_compiler_id, ASLC, 4);
header->asl_compiler_revision = asl_revision;
header->length = sizeof(acpi_hpet_t);
header->revision = get_acpi_table_revision(HPET);
/* Fill out HPET address. */
addr->space_id = ACPI_ADDRESS_SPACE_MEMORY;
addr->bit_width = 64;
addr->bit_offset = 0;
addr->addrl = HPET_BASE_ADDRESS & 0xffffffff;
addr->addrh = ((unsigned long long)HPET_BASE_ADDRESS) >> 32;
hpet->id = read32p(HPET_BASE_ADDRESS);
hpet->number = 0;
hpet->min_tick = CONFIG_HPET_MIN_TICKS;
header->checksum = acpi_checksum((void *)hpet, sizeof(acpi_hpet_t));
}
unsigned long acpi_write_hpet(const struct device *device, unsigned long current,
acpi_rsdp_t *rsdp)
{
acpi_hpet_t *hpet;
/*
* We explicitly add these tables later on:
*/
printk(BIOS_DEBUG, "ACPI: * HPET\n");
hpet = (acpi_hpet_t *)current;
current += sizeof(acpi_hpet_t);
current = ALIGN_UP(current, 16);
acpi_create_hpet(hpet);
acpi_add_table(rsdp, hpet);
return current;
}
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