diff options
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/arch/x86/acpi_device.c | 111 | ||||
| -rw-r--r-- | src/arch/x86/include/arch/acpi_device.h | 25 |
3 files changed, 137 insertions, 0 deletions
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc index c27bb1a994..536caa32dd 100644 --- a/src/arch/x86/Makefile.inc +++ b/src/arch/x86/Makefile.inc @@ -350,6 +350,7 @@ ramstage-$(CONFIG_GENERATE_PIRQ_TABLE) += pirq_routing.c ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi.c ramstage-$(CONFIG_GENERATE_SMBIOS_TABLES) += smbios.c ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpigen.c +ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi_device.c ramstage-$(CONFIG_HAVE_ACPI_RESUME) += wakeup.S ramstage-y += c_start.S diff --git a/src/arch/x86/acpi_device.c b/src/arch/x86/acpi_device.c new file mode 100644 index 0000000000..b3861a2392 --- /dev/null +++ b/src/arch/x86/acpi_device.c @@ -0,0 +1,111 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2016 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <string.h> +#include <arch/acpi.h> +#include <arch/acpi_device.h> +#include <arch/acpigen.h> +#include <device/device.h> +#include <device/path.h> + +/* Locate and return the ACPI name for this device */ +const char *acpi_device_name(struct device *dev) +{ + if (!dev) + return NULL; + + /* Check for device specific handler */ + if (dev->ops->acpi_name) + return dev->ops->acpi_name(dev); + + /* Check parent device in case it has a global handler */ + if (dev->bus && dev->bus->dev->ops->acpi_name) + return dev->bus->dev->ops->acpi_name(dev); + + return NULL; +} + +/* Recursive function to find the root device and print a path from there */ +static size_t acpi_device_path_fill(struct device *dev, char *buf, + size_t buf_len, size_t cur) +{ + const char *name = acpi_device_name(dev); + size_t next = 0; + + /* + * Make sure this name segment will fit, including the path segment + * separator and possible NUL terminator if this is the last segment. + */ + if (!dev || !name || (cur + strlen(name) + 2) > buf_len) + return cur; + + /* Walk up the tree to the root device */ + if (dev->path.type != DEVICE_PATH_ROOT && dev->bus && dev->bus->dev) + next = acpi_device_path_fill(dev->bus->dev, buf, buf_len, cur); + + /* Fill in the path from the root device */ + next += snprintf(buf + next, buf_len - next, "%s%s", + dev->path.type == DEVICE_PATH_ROOT ? "" : ".", name); + + return next; +} + +/* + * Warning: just as with dev_path() this uses a static buffer + * so should not be called mulitple times in one statement + */ +const char *acpi_device_path(struct device *dev) +{ + static char buf[DEVICE_PATH_MAX] = {}; + + if (!dev) + return NULL; + + if (acpi_device_path_fill(dev, buf, sizeof(buf), 0) <= 0) + return NULL; + + return buf; +} + +/* Return the path of the parent device as the ACPI Scope for this device */ +const char *acpi_device_scope(struct device *dev) +{ + if (!dev || !dev->bus || !dev->bus->dev) + return NULL; + + return acpi_device_path(dev->bus->dev); +} + +/* Concatentate the device path and provided name suffix */ +const char *acpi_device_path_join(struct device *dev, const char *name) +{ + static char buf[DEVICE_PATH_MAX] = {}; + size_t len; + + if (!dev) + return NULL; + + /* Build the path of this device */ + len = acpi_device_path_fill(dev, buf, sizeof(buf), 0); + if (len <= 0) + return NULL; + + /* Ensure there is room for the added name, separator, and NUL */ + if ((len + strlen(name) + 2) > sizeof(buf)) + return NULL; + snprintf(buf + len, sizeof(buf) - len, ".%s", name); + + return buf; +} diff --git a/src/arch/x86/include/arch/acpi_device.h b/src/arch/x86/include/arch/acpi_device.h new file mode 100644 index 0000000000..2cad9b5d21 --- /dev/null +++ b/src/arch/x86/include/arch/acpi_device.h @@ -0,0 +1,25 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2016 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __ACPI_DEVICE_H +#define __ACPI_DEVICE_H + +struct device; +const char *acpi_device_name(struct device *dev); +const char *acpi_device_path(struct device *dev); +const char *acpi_device_scope(struct device *dev); +const char *acpi_device_path_join(struct device *dev, const char *name); + +#endif |