blob: 0901b9260a1625958d506a3d50b732a28323e904 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Core driver model support for ACPI table generation
*
* Copyright 2019 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEOGRY LOGC_ACPI
#include <common.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <acpi/acpi_device.h>
#include <dm/acpi.h>
#include <dm/device-internal.h>
#include <dm/root.h>
#define MAX_ACPI_ITEMS 100
/* Type of table that we collected */
enum gen_type_t {
TYPE_NONE,
TYPE_SSDT,
TYPE_DSDT,
};
/* Type of method to call */
enum method_t {
METHOD_WRITE_TABLES,
METHOD_FILL_SSDT,
METHOD_INJECT_DSDT,
METHOD_SETUP_NHLT,
};
/* Prototype for all methods */
typedef int (*acpi_method)(const struct udevice *dev, struct acpi_ctx *ctx);
/**
* struct acpi_item - Holds info about ACPI data generated by a driver method
*
* @dev: Device that generated this data
* @type: Table type it refers to
* @buf: Buffer containing the data
* @size: Size of the data in bytes
*/
struct acpi_item {
struct udevice *dev;
enum gen_type_t type;
char *buf;
int size;
};
/* List of ACPI items collected */
static struct acpi_item acpi_item[MAX_ACPI_ITEMS];
static int item_count;
int acpi_copy_name(char *out_name, const char *name)
{
strncpy(out_name, name, ACPI_NAME_LEN);
out_name[ACPI_NAME_LEN] = '\0';
return 0;
}
int acpi_get_name(const struct udevice *dev, char *out_name)
{
struct acpi_ops *aops;
const char *name;
int ret;
aops = device_get_acpi_ops(dev);
if (aops && aops->get_name)
return aops->get_name(dev, out_name);
name = dev_read_string(dev, "acpi,name");
if (name)
return acpi_copy_name(out_name, name);
ret = acpi_device_infer_name(dev, out_name);
if (ret)
return log_msg_ret("dev", ret);
return 0;
}
int acpi_get_path(const struct udevice *dev, char *out_path, int maxlen)
{
const char *path;
int ret;
path = dev_read_string(dev, "acpi,path");
if (path) {
if (strlen(path) >= maxlen)
return -E2BIG;
strcpy(out_path, path);
return 0;
}
ret = acpi_device_path(dev, out_path, maxlen);
if (ret)
return log_msg_ret("dev", ret);
return 0;
}
/**
* acpi_add_item() - Add a new item to the list of data collected
*
* @ctx: ACPI context
* @dev: Device that generated the data
* @type: Table type it refers to
* @start: The start of the data (the end is obtained from ctx->current)
* @return 0 if OK, -ENOSPC if too many items, -ENOMEM if out of memory
*/
static int acpi_add_item(struct acpi_ctx *ctx, struct udevice *dev,
enum gen_type_t type, void *start)
{
struct acpi_item *item;
void *end = ctx->current;
if (item_count == MAX_ACPI_ITEMS) {
log_err("Too many items\n");
return log_msg_ret("mem", -ENOSPC);
}
item = &acpi_item[item_count];
item->dev = dev;
item->type = type;
item->size = end - start;
if (!item->size)
return 0;
item->buf = malloc(item->size);
if (!item->buf)
return log_msg_ret("mem", -ENOMEM);
memcpy(item->buf, start, item->size);
item_count++;
log_debug("* %s: Added type %d, %p, size %x\n", dev->name, type, start,
item->size);
return 0;
}
void acpi_dump_items(enum acpi_dump_option option)
{
int i;
for (i = 0; i < item_count; i++) {
struct acpi_item *item = &acpi_item[i];
printf("dev '%s', type %d, size %x\n", item->dev->name,
item->type, item->size);
if (option == ACPI_DUMP_CONTENTS) {
print_buffer(0, item->buf, 1, item->size, 0);
printf("\n");
}
}
}
static struct acpi_item *find_acpi_item(const char *devname)
{
int i;
for (i = 0; i < item_count; i++) {
struct acpi_item *item = &acpi_item[i];
if (!strcmp(devname, item->dev->name))
return item;
}
return NULL;
}
/**
* sort_acpi_item_type - Sort the ACPI items into the desired order
*
* This looks up the ordering in the device tree and then adds each item one by
* one into the supplied buffer
*
* @ctx: ACPI context
* @start: Start position to put the sorted items. The items will follow each
* other in sorted order
* @type: Type of items to sort
* @return 0 if OK, -ve on error
*/
static int sort_acpi_item_type(struct acpi_ctx *ctx, void *start,
enum gen_type_t type)
{
const u32 *order;
int size;
int count;
void *ptr;
void *end = ctx->current;
ptr = start;
order = ofnode_read_chosen_prop(type == TYPE_DSDT ?
"u-boot,acpi-dsdt-order" :
"u-boot,acpi-ssdt-order", &size);
if (!order) {
log_debug("Failed to find ordering, leaving as is\n");
return 0;
}
/*
* This algorithm rewrites the context buffer without changing its
* length. So there is no need to update ctx-current
*/
count = size / sizeof(u32);
while (count--) {
struct acpi_item *item;
const char *name;
ofnode node;
node = ofnode_get_by_phandle(fdt32_to_cpu(*order++));
name = ofnode_get_name(node);
item = find_acpi_item(name);
if (!item) {
log_err("Failed to find item '%s'\n", name);
return log_msg_ret("find", -ENOENT);
}
if (item->type == type) {
log_debug(" - add %s\n", item->dev->name);
memcpy(ptr, item->buf, item->size);
ptr += item->size;
}
}
/*
* If the sort order is missing an item then the output will be too
* small. Report this error since the item needs to be added to the
* ordering for the ACPI tables to be complete.
*/
if (ptr != end) {
log_warning("*** Missing bytes: ptr=%p, end=%p\n", ptr, end);
return -ENXIO;
}
return 0;
}
acpi_method acpi_get_method(struct udevice *dev, enum method_t method)
{
struct acpi_ops *aops;
aops = device_get_acpi_ops(dev);
if (aops) {
switch (method) {
case METHOD_WRITE_TABLES:
return aops->write_tables;
case METHOD_FILL_SSDT:
return aops->fill_ssdt;
case METHOD_INJECT_DSDT:
return aops->inject_dsdt;
case METHOD_SETUP_NHLT:
return aops->setup_nhlt;
}
}
return NULL;
}
int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent,
enum method_t method, enum gen_type_t type)
{
struct udevice *dev;
acpi_method func;
int ret;
func = acpi_get_method(parent, method);
if (func) {
void *start = ctx->current;
log_debug("- method %d, %s %p\n", method, parent->name, func);
ret = device_of_to_plat(parent);
if (ret)
return log_msg_ret("ofdata", ret);
ret = func(parent, ctx);
if (ret)
return log_msg_ret("func", ret);
/* Add the item to the internal list */
if (type != TYPE_NONE) {
ret = acpi_add_item(ctx, parent, type, start);
if (ret)
return log_msg_ret("add", ret);
}
}
device_foreach_child(dev, parent) {
ret = acpi_recurse_method(ctx, dev, method, type);
if (ret)
return log_msg_ret("recurse", ret);
}
return 0;
}
int acpi_fill_ssdt(struct acpi_ctx *ctx)
{
void *start = ctx->current;
int ret;
log_debug("Writing SSDT tables\n");
ret = acpi_recurse_method(ctx, dm_root(), METHOD_FILL_SSDT, TYPE_SSDT);
log_debug("Writing SSDT finished, err=%d\n", ret);
ret = sort_acpi_item_type(ctx, start, TYPE_SSDT);
if (ret)
return log_msg_ret("build", ret);
return ret;
}
int acpi_inject_dsdt(struct acpi_ctx *ctx)
{
void *start = ctx->current;
int ret;
log_debug("Writing DSDT tables\n");
ret = acpi_recurse_method(ctx, dm_root(), METHOD_INJECT_DSDT,
TYPE_DSDT);
log_debug("Writing DSDT finished, err=%d\n", ret);
ret = sort_acpi_item_type(ctx, start, TYPE_DSDT);
if (ret)
return log_msg_ret("build", ret);
return ret;
}
void acpi_reset_items(void)
{
item_count = 0;
}
int acpi_write_dev_tables(struct acpi_ctx *ctx)
{
int ret;
log_debug("Writing device tables\n");
ret = acpi_recurse_method(ctx, dm_root(), METHOD_WRITE_TABLES,
TYPE_NONE);
log_debug("Writing finished, err=%d\n", ret);
return ret;
}
int acpi_setup_nhlt(struct acpi_ctx *ctx, struct nhlt *nhlt)
{
int ret;
log_debug("Setup NHLT\n");
ctx->nhlt = nhlt;
ret = acpi_recurse_method(ctx, dm_root(), METHOD_SETUP_NHLT, TYPE_NONE);
log_debug("Setup finished, err=%d\n", ret);
return ret;
}