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![Simon Glass](/assets/img/avatar_default.png)
Allow writing named integers and strings to the generated ACPI code. 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 the "new blank line at EOF" warning] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
617 lines
15 KiB
C
617 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generation of ACPI (Advanced Configuration and Power Interface) tables
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*
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* Copyright 2019 Google LLC
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* Mostly taken from coreboot
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*/
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#define LOG_CATEGORY LOGC_ACPI
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <uuid.h>
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#include <acpi/acpigen.h>
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#include <acpi/acpi_device.h>
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#include <acpi/acpi_table.h>
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#include <dm/acpi.h>
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u8 *acpigen_get_current(struct acpi_ctx *ctx)
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{
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return ctx->current;
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}
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void acpigen_emit_byte(struct acpi_ctx *ctx, uint data)
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{
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*(u8 *)ctx->current++ = data;
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}
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void acpigen_emit_word(struct acpi_ctx *ctx, uint data)
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{
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acpigen_emit_byte(ctx, data & 0xff);
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acpigen_emit_byte(ctx, (data >> 8) & 0xff);
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}
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void acpigen_emit_dword(struct acpi_ctx *ctx, uint data)
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{
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/* Output the value in little-endian format */
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acpigen_emit_byte(ctx, data & 0xff);
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acpigen_emit_byte(ctx, (data >> 8) & 0xff);
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acpigen_emit_byte(ctx, (data >> 16) & 0xff);
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acpigen_emit_byte(ctx, (data >> 24) & 0xff);
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}
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/*
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* Maximum length for an ACPI object generated by this code,
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*
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* If you need to change this, change acpigen_write_len_f(ctx) and
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* acpigen_pop_len(ctx)
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*/
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#define ACPIGEN_MAXLEN 0xfffff
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void acpigen_write_len_f(struct acpi_ctx *ctx)
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{
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assert(ctx->ltop < (ACPIGEN_LENSTACK_SIZE - 1));
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ctx->len_stack[ctx->ltop++] = ctx->current;
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acpigen_emit_byte(ctx, 0);
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acpigen_emit_byte(ctx, 0);
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acpigen_emit_byte(ctx, 0);
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}
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void acpigen_pop_len(struct acpi_ctx *ctx)
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{
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int len;
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char *p;
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assert(ctx->ltop > 0);
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p = ctx->len_stack[--ctx->ltop];
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len = ctx->current - (void *)p;
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assert(len <= ACPIGEN_MAXLEN);
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/* generate store length for 0xfffff max */
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p[0] = ACPI_PKG_LEN_3_BYTES | (len & 0xf);
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p[1] = len >> 4 & 0xff;
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p[2] = len >> 12 & 0xff;
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}
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void acpigen_emit_ext_op(struct acpi_ctx *ctx, uint op)
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{
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acpigen_emit_byte(ctx, EXT_OP_PREFIX);
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acpigen_emit_byte(ctx, op);
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}
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char *acpigen_write_package(struct acpi_ctx *ctx, int nr_el)
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{
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char *p;
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acpigen_emit_byte(ctx, PACKAGE_OP);
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acpigen_write_len_f(ctx);
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p = ctx->current;
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acpigen_emit_byte(ctx, nr_el);
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return p;
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}
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void acpigen_write_byte(struct acpi_ctx *ctx, unsigned int data)
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{
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acpigen_emit_byte(ctx, BYTE_PREFIX);
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acpigen_emit_byte(ctx, data & 0xff);
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}
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void acpigen_write_word(struct acpi_ctx *ctx, unsigned int data)
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{
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acpigen_emit_byte(ctx, WORD_PREFIX);
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acpigen_emit_word(ctx, data);
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}
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void acpigen_write_dword(struct acpi_ctx *ctx, unsigned int data)
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{
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acpigen_emit_byte(ctx, DWORD_PREFIX);
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acpigen_emit_dword(ctx, data);
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}
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void acpigen_write_qword(struct acpi_ctx *ctx, u64 data)
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{
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acpigen_emit_byte(ctx, QWORD_PREFIX);
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acpigen_emit_dword(ctx, data & 0xffffffff);
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acpigen_emit_dword(ctx, (data >> 32) & 0xffffffff);
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}
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void acpigen_write_zero(struct acpi_ctx *ctx)
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{
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acpigen_emit_byte(ctx, ZERO_OP);
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}
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void acpigen_write_one(struct acpi_ctx *ctx)
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{
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acpigen_emit_byte(ctx, ONE_OP);
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}
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void acpigen_write_integer(struct acpi_ctx *ctx, u64 data)
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{
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if (data == 0)
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acpigen_write_zero(ctx);
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else if (data == 1)
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acpigen_write_one(ctx);
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else if (data <= 0xff)
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acpigen_write_byte(ctx, (unsigned char)data);
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else if (data <= 0xffff)
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acpigen_write_word(ctx, (unsigned int)data);
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else if (data <= 0xffffffff)
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acpigen_write_dword(ctx, (unsigned int)data);
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else
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acpigen_write_qword(ctx, data);
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}
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void acpigen_write_name_zero(struct acpi_ctx *ctx, const char *name)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_zero(ctx);
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}
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void acpigen_write_name_one(struct acpi_ctx *ctx, const char *name)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_one(ctx);
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}
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void acpigen_write_name_byte(struct acpi_ctx *ctx, const char *name, uint val)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_byte(ctx, val);
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}
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void acpigen_write_name_word(struct acpi_ctx *ctx, const char *name, uint val)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_word(ctx, val);
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}
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void acpigen_write_name_dword(struct acpi_ctx *ctx, const char *name, uint val)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_dword(ctx, val);
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}
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void acpigen_write_name_qword(struct acpi_ctx *ctx, const char *name, u64 val)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_qword(ctx, val);
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}
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void acpigen_write_name_integer(struct acpi_ctx *ctx, const char *name, u64 val)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_integer(ctx, val);
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}
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void acpigen_write_name_string(struct acpi_ctx *ctx, const char *name,
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const char *string)
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{
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acpigen_write_name(ctx, name);
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acpigen_write_string(ctx, string);
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}
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void acpigen_emit_stream(struct acpi_ctx *ctx, const char *data, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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acpigen_emit_byte(ctx, data[i]);
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}
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void acpigen_emit_string(struct acpi_ctx *ctx, const char *str)
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{
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acpigen_emit_stream(ctx, str, str ? strlen(str) : 0);
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acpigen_emit_byte(ctx, '\0');
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}
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void acpigen_write_string(struct acpi_ctx *ctx, const char *str)
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{
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acpigen_emit_byte(ctx, STRING_PREFIX);
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acpigen_emit_string(ctx, str);
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}
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/*
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* The naming conventions for ACPI namespace names are a bit tricky as
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* each element has to be 4 chars wide ("All names are a fixed 32 bits.")
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* and "By convention, when an ASL compiler pads a name shorter than 4
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* characters, it is done so with trailing underscores ('_')".
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*
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* Check sections 5.3, 20.2.2 and 20.4 of ACPI spec 6.3 for details.
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*/
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static void acpigen_emit_simple_namestring(struct acpi_ctx *ctx,
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const char *name)
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{
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const char *ptr;
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int i;
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for (i = 0, ptr = name; i < 4; i++) {
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if (!*ptr || *ptr == '.')
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acpigen_emit_byte(ctx, '_');
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else
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acpigen_emit_byte(ctx, *ptr++);
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}
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}
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static void acpigen_emit_double_namestring(struct acpi_ctx *ctx,
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const char *name, int dotpos)
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{
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acpigen_emit_byte(ctx, DUAL_NAME_PREFIX);
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acpigen_emit_simple_namestring(ctx, name);
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acpigen_emit_simple_namestring(ctx, &name[dotpos + 1]);
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}
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static void acpigen_emit_multi_namestring(struct acpi_ctx *ctx,
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const char *name)
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{
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unsigned char *pathlen;
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int count = 0;
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acpigen_emit_byte(ctx, MULTI_NAME_PREFIX);
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pathlen = ctx->current;
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acpigen_emit_byte(ctx, 0);
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while (*name) {
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acpigen_emit_simple_namestring(ctx, name);
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/* find end or next entity */
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while (*name != '.' && *name)
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name++;
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/* forward to next */
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if (*name == '.')
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name++;
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count++;
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}
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*pathlen = count;
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}
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void acpigen_emit_namestring(struct acpi_ctx *ctx, const char *namepath)
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{
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int dotcount;
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int dotpos;
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int i;
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/* We can start with a '\' */
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if (*namepath == '\\') {
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acpigen_emit_byte(ctx, '\\');
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namepath++;
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}
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/* And there can be any number of '^' */
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while (*namepath == '^') {
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acpigen_emit_byte(ctx, '^');
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namepath++;
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}
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for (i = 0, dotcount = 0; namepath[i]; i++) {
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if (namepath[i] == '.') {
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dotcount++;
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dotpos = i;
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}
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}
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/* If we have only \\ or only ^* then we need to add a null name */
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if (!*namepath)
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acpigen_emit_byte(ctx, ZERO_OP);
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else if (dotcount == 0)
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acpigen_emit_simple_namestring(ctx, namepath);
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else if (dotcount == 1)
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acpigen_emit_double_namestring(ctx, namepath, dotpos);
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else
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acpigen_emit_multi_namestring(ctx, namepath);
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}
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void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath)
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{
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acpigen_emit_byte(ctx, NAME_OP);
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acpigen_emit_namestring(ctx, namepath);
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}
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void acpigen_write_scope(struct acpi_ctx *ctx, const char *scope)
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{
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acpigen_emit_byte(ctx, SCOPE_OP);
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acpigen_write_len_f(ctx);
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acpigen_emit_namestring(ctx, scope);
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}
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static void acpigen_write_method_internal(struct acpi_ctx *ctx,
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const char *name, uint flags)
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{
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acpigen_emit_byte(ctx, METHOD_OP);
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acpigen_write_len_f(ctx);
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acpigen_emit_namestring(ctx, name);
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acpigen_emit_byte(ctx, flags);
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}
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/* Method (name, nargs, NotSerialized) */
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void acpigen_write_method(struct acpi_ctx *ctx, const char *name, int nargs)
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{
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acpigen_write_method_internal(ctx, name,
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nargs & ACPI_METHOD_NARGS_MASK);
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}
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/* Method (name, nargs, Serialized) */
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void acpigen_write_method_serialized(struct acpi_ctx *ctx, const char *name,
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int nargs)
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{
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acpigen_write_method_internal(ctx, name,
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(nargs & ACPI_METHOD_NARGS_MASK) |
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ACPI_METHOD_SERIALIZED_MASK);
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}
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void acpigen_write_device(struct acpi_ctx *ctx, const char *name)
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{
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acpigen_emit_ext_op(ctx, DEVICE_OP);
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acpigen_write_len_f(ctx);
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acpigen_emit_namestring(ctx, name);
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}
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void acpigen_write_sta(struct acpi_ctx *ctx, uint status)
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{
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/* Method (_STA, 0, NotSerialized) { Return (status) } */
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acpigen_write_method(ctx, "_STA", 0);
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acpigen_emit_byte(ctx, RETURN_OP);
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acpigen_write_byte(ctx, status);
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acpigen_pop_len(ctx);
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}
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static void acpigen_write_register(struct acpi_ctx *ctx,
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const struct acpi_gen_regaddr *addr)
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{
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/* See ACPI v6.3 section 6.4.3.7: Generic Register Descriptor */
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acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_REGISTER);
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acpigen_emit_byte(ctx, 0x0c); /* Register Length 7:0 */
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acpigen_emit_byte(ctx, 0x00); /* Register Length 15:8 */
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acpigen_emit_byte(ctx, addr->space_id);
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acpigen_emit_byte(ctx, addr->bit_width);
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acpigen_emit_byte(ctx, addr->bit_offset);
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acpigen_emit_byte(ctx, addr->access_size);
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acpigen_emit_dword(ctx, addr->addrl);
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acpigen_emit_dword(ctx, addr->addrh);
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}
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void acpigen_write_resourcetemplate_header(struct acpi_ctx *ctx)
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{
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/*
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* A ResourceTemplate() is a Buffer() with a
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* (Byte|Word|DWord) containing the length, followed by one or more
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* resource items, terminated by the end tag.
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* (small item 0xf, len 1)
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*/
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acpigen_emit_byte(ctx, BUFFER_OP);
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acpigen_write_len_f(ctx);
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acpigen_emit_byte(ctx, WORD_PREFIX);
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ctx->len_stack[ctx->ltop++] = ctx->current;
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/*
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* Add two dummy bytes for the ACPI word (keep aligned with the
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* calculation in acpigen_write_resourcetemplate_footer() below)
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*/
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acpigen_emit_byte(ctx, 0x00);
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acpigen_emit_byte(ctx, 0x00);
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}
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void acpigen_write_resourcetemplate_footer(struct acpi_ctx *ctx)
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{
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char *p = ctx->len_stack[--ctx->ltop];
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int len;
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/*
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* See ACPI v6.3 section 6.4.2.9: End Tag
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* 0x79 <checksum>
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* 0x00 is treated as a good checksum according to the spec
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* and is what iasl generates.
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*/
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acpigen_emit_byte(ctx, ACPI_END_TAG);
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acpigen_emit_byte(ctx, 0x00);
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/*
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* Start counting past the 2-bytes length added in
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* acpigen_write_resourcetemplate_header() above
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*/
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len = (char *)ctx->current - (p + 2);
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/* patch len word */
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p[0] = len & 0xff;
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p[1] = (len >> 8) & 0xff;
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acpigen_pop_len(ctx);
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}
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void acpigen_write_register_resource(struct acpi_ctx *ctx,
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const struct acpi_gen_regaddr *addr)
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{
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acpigen_write_resourcetemplate_header(ctx);
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acpigen_write_register(ctx, addr);
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acpigen_write_resourcetemplate_footer(ctx);
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}
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/*
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* ToUUID(uuid)
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*
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* ACPI 6.3 Section 19.6.142 table 19-438 defines a special output order for the
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* bytes that make up a UUID Buffer object:
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*
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* UUID byte order for input to this function:
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* aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
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*
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* UUID byte order output by this function:
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* ddccbbaa-ffee-hhgg-iijj-kkllmmnnoopp
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*/
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int acpigen_write_uuid(struct acpi_ctx *ctx, const char *uuid)
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{
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u8 buf[UUID_BIN_LEN];
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int ret;
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/* Parse UUID string into bytes */
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ret = uuid_str_to_bin(uuid, buf, UUID_STR_FORMAT_GUID);
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if (ret)
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return log_msg_ret("bad hex", -EINVAL);
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/* BufferOp */
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acpigen_emit_byte(ctx, BUFFER_OP);
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acpigen_write_len_f(ctx);
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/* Buffer length in bytes */
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acpigen_write_word(ctx, UUID_BIN_LEN);
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/* Output UUID in expected order */
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acpigen_emit_stream(ctx, (char *)buf, UUID_BIN_LEN);
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acpigen_pop_len(ctx);
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return 0;
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}
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void acpigen_write_power_res(struct acpi_ctx *ctx, const char *name, uint level,
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uint order, const char *const dev_states[],
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size_t dev_states_count)
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{
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size_t i;
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for (i = 0; i < dev_states_count; i++) {
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acpigen_write_name(ctx, dev_states[i]);
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acpigen_write_package(ctx, 1);
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acpigen_emit_simple_namestring(ctx, name);
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acpigen_pop_len(ctx); /* Package */
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}
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acpigen_emit_ext_op(ctx, POWER_RES_OP);
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acpigen_write_len_f(ctx);
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acpigen_emit_simple_namestring(ctx, name);
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acpigen_emit_byte(ctx, level);
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acpigen_emit_word(ctx, order);
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}
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/* Sleep (ms) */
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void acpigen_write_sleep(struct acpi_ctx *ctx, u64 sleep_ms)
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{
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acpigen_emit_ext_op(ctx, SLEEP_OP);
|
|
acpigen_write_integer(ctx, sleep_ms);
|
|
}
|
|
|
|
void acpigen_write_store(struct acpi_ctx *ctx)
|
|
{
|
|
acpigen_emit_byte(ctx, STORE_OP);
|
|
}
|
|
|
|
/* Or (arg1, arg2, res) */
|
|
void acpigen_write_or(struct acpi_ctx *ctx, u8 arg1, u8 arg2, u8 res)
|
|
{
|
|
acpigen_emit_byte(ctx, OR_OP);
|
|
acpigen_emit_byte(ctx, arg1);
|
|
acpigen_emit_byte(ctx, arg2);
|
|
acpigen_emit_byte(ctx, res);
|
|
}
|
|
|
|
/* And (arg1, arg2, res) */
|
|
void acpigen_write_and(struct acpi_ctx *ctx, u8 arg1, u8 arg2, u8 res)
|
|
{
|
|
acpigen_emit_byte(ctx, AND_OP);
|
|
acpigen_emit_byte(ctx, arg1);
|
|
acpigen_emit_byte(ctx, arg2);
|
|
acpigen_emit_byte(ctx, res);
|
|
}
|
|
|
|
/* Not (arg, res) */
|
|
void acpigen_write_not(struct acpi_ctx *ctx, u8 arg, u8 res)
|
|
{
|
|
acpigen_emit_byte(ctx, NOT_OP);
|
|
acpigen_emit_byte(ctx, arg);
|
|
acpigen_emit_byte(ctx, res);
|
|
}
|
|
|
|
/* Store (str, DEBUG) */
|
|
void acpigen_write_debug_string(struct acpi_ctx *ctx, const char *str)
|
|
{
|
|
acpigen_write_store(ctx);
|
|
acpigen_write_string(ctx, str);
|
|
acpigen_emit_ext_op(ctx, DEBUG_OP);
|
|
}
|
|
|
|
/**
|
|
* acpigen_get_dw0_in_local5() - Generate code to put dw0 cfg0 in local5
|
|
*
|
|
* Store (\_SB.GPC0 (addr), Local5)
|
|
*
|
|
* \_SB.GPC0 is used to read cfg0 value from dw0. It is typically defined in
|
|
* the board's gpiolib.asl
|
|
*
|
|
* The value needs to be stored in a local variable so that it can be used in
|
|
* expressions in the ACPI code.
|
|
*
|
|
* @ctx: ACPI context pointer
|
|
* @dw0_read: Name to use to read dw0, e.g. "\\_SB.GPC0"
|
|
* @addr: GPIO pin configuration register address
|
|
*
|
|
*/
|
|
static void acpigen_get_dw0_in_local5(struct acpi_ctx *ctx,
|
|
const char *dw0_read, ulong addr)
|
|
{
|
|
acpigen_write_store(ctx);
|
|
acpigen_emit_namestring(ctx, dw0_read);
|
|
acpigen_write_integer(ctx, addr);
|
|
acpigen_emit_byte(ctx, LOCAL5_OP);
|
|
}
|
|
|
|
/**
|
|
* acpigen_set_gpio_val() - Emit code to set value of TX GPIO to on/off
|
|
*
|
|
* @ctx: ACPI context pointer
|
|
* @dw0_read: Method name to use to read dw0, e.g. "\\_SB.GPC0"
|
|
* @dw0_write: Method name to use to read dw0, e.g. "\\_SB.SPC0"
|
|
* @gpio_num: GPIO number to adjust
|
|
* @vaL: true to set on, false to set off
|
|
*/
|
|
static int acpigen_set_gpio_val(struct acpi_ctx *ctx, u32 tx_state_val,
|
|
const char *dw0_read, const char *dw0_write,
|
|
struct acpi_gpio *gpio, bool val)
|
|
{
|
|
acpigen_get_dw0_in_local5(ctx, dw0_read, gpio->pin0_addr);
|
|
|
|
/* Store (0x40, Local0) */
|
|
acpigen_write_store(ctx);
|
|
acpigen_write_integer(ctx, tx_state_val);
|
|
acpigen_emit_byte(ctx, LOCAL0_OP);
|
|
|
|
if (val) {
|
|
/* Or (Local5, PAD_CFG0_TX_STATE, Local5) */
|
|
acpigen_write_or(ctx, LOCAL5_OP, LOCAL0_OP, LOCAL5_OP);
|
|
} else {
|
|
/* Not (PAD_CFG0_TX_STATE, Local6) */
|
|
acpigen_write_not(ctx, LOCAL0_OP, LOCAL6_OP);
|
|
|
|
/* And (Local5, Local6, Local5) */
|
|
acpigen_write_and(ctx, LOCAL5_OP, LOCAL6_OP, LOCAL5_OP);
|
|
}
|
|
|
|
/*
|
|
* \_SB.SPC0 (addr, Local5)
|
|
* \_SB.SPC0 is used to write cfg0 value in dw0. It is defined in
|
|
* gpiolib.asl.
|
|
*/
|
|
acpigen_emit_namestring(ctx, dw0_write);
|
|
acpigen_write_integer(ctx, gpio->pin0_addr);
|
|
acpigen_emit_byte(ctx, LOCAL5_OP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int acpigen_set_enable_tx_gpio(struct acpi_ctx *ctx, u32 tx_state_val,
|
|
const char *dw0_read, const char *dw0_write,
|
|
struct acpi_gpio *gpio, bool enable)
|
|
{
|
|
bool set;
|
|
int ret;
|
|
|
|
set = gpio->polarity == ACPI_GPIO_ACTIVE_HIGH ? enable : !enable;
|
|
ret = acpigen_set_gpio_val(ctx, tx_state_val, dw0_read, dw0_write, gpio,
|
|
set);
|
|
if (ret)
|
|
return log_msg_ret("call", ret);
|
|
|
|
return 0;
|
|
}
|