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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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1
include/acpi/acpi_device.h
View file

@ -20,6 +20,7 @@ struct udevice;
/* ACPI descriptor values for common descriptors: SERIAL_BUS means I2C */
#define ACPI_DESCRIPTOR_LARGE BIT(7)
#define ACPI_DESCRIPTOR_REGISTER (ACPI_DESCRIPTOR_LARGE | 2)
#define ACPI_DESCRIPTOR_INTERRUPT (ACPI_DESCRIPTOR_LARGE | 9)
#define ACPI_DESCRIPTOR_GPIO (ACPI_DESCRIPTOR_LARGE | 12)
#define ACPI_DESCRIPTOR_SERIAL_BUS (ACPI_DESCRIPTOR_LARGE | 14)

28
include/acpi/acpigen.h
View file

@ -13,6 +13,7 @@
#include <linux/types.h>
struct acpi_ctx;
struct acpi_gen_regaddr;
struct acpi_gpio;
/* Top 4 bits of the value used to indicate a three-byte length value */
@ -21,6 +22,8 @@ struct acpi_gpio;
#define ACPI_METHOD_NARGS_MASK 0x7
#define ACPI_METHOD_SERIALIZED_MASK BIT(3)
#define ACPI_END_TAG 0x79
/* ACPI Op/Prefix codes */
enum {
ZERO_OP = 0x00,
@ -318,6 +321,31 @@ void acpigen_write_method_serialized(struct acpi_ctx *ctx, const char *name,
*/
void acpigen_write_sta(struct acpi_ctx *ctx, uint status);
/**
* acpigen_write_resourcetemplate_header() - Write a ResourceTemplate header
*
* @ctx: ACPI context pointer
*/
void acpigen_write_resourcetemplate_header(struct acpi_ctx *ctx);
/**
* acpigen_write_resourcetemplate_footer() - Write a ResourceTemplate footer
*
* @ctx: ACPI context pointer
*/
void acpigen_write_resourcetemplate_footer(struct acpi_ctx *ctx);
/**
* acpigen_write_register_resource() - Write a register resource
*
* This writes a header, the address information and a footer
*
* @ctx: ACPI context pointer
* @addr: Address to write
*/
void acpigen_write_register_resource(struct acpi_ctx *ctx,
const struct acpi_gen_regaddr *addr);
/**
* acpigen_write_sleep() - Write a sleep operation
*

71
lib/acpi/acpigen.c
View file

@ -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)
*

46
test/dm/acpigen.c
View file

@ -12,6 +12,7 @@
#include <malloc.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <acpi/acpi_table.h>
#include <asm/gpio.h>
#include <asm/unaligned.h>
#include <dm/acpi.h>
@ -947,3 +948,48 @@ static int dm_test_acpi_scope(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_acpi_scope, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test writing a resource template */
static int dm_test_acpi_resource_template(struct unit_test_state *uts)
{
struct acpi_gen_regaddr addr;
struct acpi_ctx *ctx;
u8 *ptr;
ut_assertok(alloc_context(&ctx));
ptr = acpigen_get_current(ctx);
addr.space_id = ACPI_ADDRESS_SPACE_EC;
addr.bit_width = 32;
addr.bit_offset = 8;
addr.access_size = ACPI_ACCESS_SIZE_DWORD_ACCESS;
addr.addrl = TEST_INT64 & 0xffffffff;
addr.addrh = TEST_INT64 >> 32;
acpigen_write_register_resource(ctx, &addr);
ut_asserteq(BUFFER_OP, *ptr++);
ut_asserteq(0x17, acpi_test_get_length(ptr));
ptr += 3;
ut_asserteq(WORD_PREFIX, *ptr++);
ut_asserteq(0x11, get_unaligned((u16 *)ptr));
ptr += 2;
ut_asserteq(ACPI_DESCRIPTOR_REGISTER, *ptr++);
ut_asserteq(0xc, *ptr++);
ut_asserteq(0, *ptr++);
ut_asserteq(ACPI_ADDRESS_SPACE_EC, *ptr++);
ut_asserteq(32, *ptr++);
ut_asserteq(8, *ptr++);
ut_asserteq(ACPI_ACCESS_SIZE_DWORD_ACCESS, *ptr++);
ut_asserteq(TEST_INT64 & 0xffffffff, get_unaligned((u32 *)ptr));
ptr += 4;
ut_asserteq(TEST_INT64 >> 32, get_unaligned((u32 *)ptr));
ptr += 4;
ut_asserteq(ACPI_END_TAG, *ptr++);
ut_asserteq(0x00, *ptr++);
ut_asserteq_ptr(ptr, ctx->current);
free_context(&ctx);
return 0;
}
DM_TEST(dm_test_acpi_resource_template, 0);