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x86: acpi: Support generation of the HPET table

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Add an implementation of the HPET (High Precision Event Timer) ACPI
table. Since this is x86-specific, put it in an x86-specific file

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-22 12:45:09 -06:00 committed by Bin Meng
parent 6c0da2da7c
commit d2628984b7
3 changed files with 91 additions and 9 deletions
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10
arch/x86/include/asm/acpi_table.h
View file

@ -36,6 +36,16 @@ int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
u32 acpi_fill_mcfg(u32 current);
u32 acpi_fill_csrt(u32 current);
/**
* acpi_write_hpet() - Write out a HPET table
*
* Write out the table for High-Precision Event Timers
*
* @ctx: Current ACPI context
* @return 0 if OK, -ve on error
*/
int acpi_write_hpet(struct acpi_ctx *ctx);
/**
* acpi_create_gnvs() - Create a GNVS (Global Non Volatile Storage) table
*

59
arch/x86/lib/acpi_table.c
View file

@ -529,3 +529,62 @@ ulong acpi_get_rsdp_addr(void)
{
return acpi_rsdp_addr;
}
/**
* acpi_write_hpet() - Write out a HPET table
*
* Write out the table for High-Precision Event Timers
*
* @hpet: Place to put HPET table
*/
static int acpi_create_hpet(struct acpi_hpet *hpet)
{
struct acpi_table_header *header = &hpet->header;
struct acpi_gen_regaddr *addr = &hpet->addr;
/*
* See IA-PC HPET (High Precision Event Timers) Specification v1.0a
* https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/software-developers-hpet-spec-1-0a.pdf
*/
memset((void *)hpet, '\0', sizeof(struct acpi_hpet));
/* Fill out header fields. */
acpi_fill_header(header, "HPET");
header->aslc_revision = ASL_REVISION;
header->length = sizeof(struct acpi_hpet);
header->revision = acpi_get_table_revision(ACPITAB_HPET);
/* Fill out HPET address */
addr->space_id = 0; /* Memory */
addr->bit_width = 64;
addr->bit_offset = 0;
addr->addrl = CONFIG_HPET_ADDRESS & 0xffffffff;
addr->addrh = ((unsigned long long)CONFIG_HPET_ADDRESS) >> 32;
hpet->id = *(u32 *)CONFIG_HPET_ADDRESS;
hpet->number = 0;
hpet->min_tick = 0; /* HPET_MIN_TICKS */
header->checksum = table_compute_checksum(hpet,
sizeof(struct acpi_hpet));
return 0;
}
int acpi_write_hpet(struct acpi_ctx *ctx)
{
struct acpi_hpet *hpet;
int ret;
log_debug("ACPI: * HPET\n");
hpet = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_hpet));
acpi_create_hpet(hpet);
ret = acpi_add_table(ctx, hpet);
if (ret)
return log_msg_ret("add", ret);
return 0;
}

31
include/acpi/acpi_table.h
View file

@ -20,6 +20,9 @@
#define OEM_TABLE_ID "U-BOOTBL" /* U-Boot Table */
#define ASLC_ID "INTL" /* Intel ASL Compiler */
/* TODO(sjg@chromium.org): Figure out how to get compiler revision */
#define ASL_REVISION 0
#define ACPI_RSDP_REV_ACPI_1_0 0
#define ACPI_RSDP_REV_ACPI_2_0 2
@ -56,6 +59,15 @@ struct __packed acpi_table_header {
u32 aslc_revision; /* ASL compiler revision number */
};
struct acpi_gen_regaddr {
u8 space_id; /* Address space ID */
u8 bit_width; /* Register size in bits */
u8 bit_offset; /* Register bit offset */
u8 access_size; /* Access size */
u32 addrl; /* Register address, low 32 bits */
u32 addrh; /* Register address, high 32 bits */
};
/* A maximum number of 32 ACPI tables ought to be enough for now */
#define MAX_ACPI_TABLES 32
@ -71,6 +83,16 @@ struct acpi_xsdt {
u64 entry[MAX_ACPI_TABLES];
};
/* HPET timers */
struct __packed acpi_hpet {
struct acpi_table_header header;
u32 id;
struct acpi_gen_regaddr addr;
u8 number;
u16 min_tick;
u8 attributes;
};
/* FADT Preferred Power Management Profile */
enum acpi_pm_profile {
ACPI_PM_UNSPECIFIED = 0,
@ -138,15 +160,6 @@ enum acpi_address_space_size {
ACPI_ACCESS_SIZE_QWORD_ACCESS
};
struct acpi_gen_regaddr {
u8 space_id; /* Address space ID */
u8 bit_width; /* Register size in bits */
u8 bit_offset; /* Register bit offset */
u8 access_size; /* Access size */
u32 addrl; /* Register address, low 32 bits */
u32 addrh; /* Register address, high 32 bits */
};
/* FADT (Fixed ACPI Description Table) */
struct __packed acpi_fadt {
struct acpi_table_header header;