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acpi: Support generation of a generic register

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Allow writing out a generic register.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
[bmeng: Fix build failures on Sandbox]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2020-07-07 21:32:11 -06:00
committed by Bin Meng
parent 82659cc910
commit d7d631df2d
4 changed files with 146 additions and 0 deletions
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71
lib/acpi/acpigen.c
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@@ -14,6 +14,7 @@
#include <uuid.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <acpi/acpi_table.h>
#include <dm/acpi.h>
u8 *acpigen_get_current(struct acpi_ctx *ctx)
@@ -299,6 +300,76 @@ void acpigen_write_sta(struct acpi_ctx *ctx, uint status)
acpigen_pop_len(ctx);
}
static void acpigen_write_register(struct acpi_ctx *ctx,
const struct acpi_gen_regaddr *addr)
{
/* See ACPI v6.3 section 6.4.3.7: Generic Register Descriptor */
acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_REGISTER);
acpigen_emit_byte(ctx, 0x0c); /* Register Length 7:0 */
acpigen_emit_byte(ctx, 0x00); /* Register Length 15:8 */
acpigen_emit_byte(ctx, addr->space_id);
acpigen_emit_byte(ctx, addr->bit_width);
acpigen_emit_byte(ctx, addr->bit_offset);
acpigen_emit_byte(ctx, addr->access_size);
acpigen_emit_dword(ctx, addr->addrl);
acpigen_emit_dword(ctx, addr->addrh);
}
void acpigen_write_resourcetemplate_header(struct acpi_ctx *ctx)
{
/*
* A ResourceTemplate() is a Buffer() with a
* (Byte|Word|DWord) containing the length, followed by one or more
* resource items, terminated by the end tag.
* (small item 0xf, len 1)
*/
acpigen_emit_byte(ctx, BUFFER_OP);
acpigen_write_len_f(ctx);
acpigen_emit_byte(ctx, WORD_PREFIX);
ctx->len_stack[ctx->ltop++] = ctx->current;
/*
* Add two dummy bytes for the ACPI word (keep aligned with the
* calculation in acpigen_write_resourcetemplate_footer() below)
*/
acpigen_emit_byte(ctx, 0x00);
acpigen_emit_byte(ctx, 0x00);
}
void acpigen_write_resourcetemplate_footer(struct acpi_ctx *ctx)
{
char *p = ctx->len_stack[--ctx->ltop];
int len;
/*
* See ACPI v6.3 section 6.4.2.9: End Tag
* 0x79 <checksum>
* 0x00 is treated as a good checksum according to the spec
* and is what iasl generates.
*/
acpigen_emit_byte(ctx, ACPI_END_TAG);
acpigen_emit_byte(ctx, 0x00);
/*
* Start counting past the 2-bytes length added in
* acpigen_write_resourcetemplate_header() above
*/
len = (char *)ctx->current - (p + 2);
/* patch len word */
p[0] = len & 0xff;
p[1] = (len >> 8) & 0xff;
acpigen_pop_len(ctx);
}
void acpigen_write_register_resource(struct acpi_ctx *ctx,
const struct acpi_gen_regaddr *addr)
{
acpigen_write_resourcetemplate_header(ctx);
acpigen_write_register(ctx, addr);
acpigen_write_resourcetemplate_footer(ctx);
}
/*
* ToUUID(uuid)
*