@@ -261,4 +261,13 @@ config DM_DEV_READ_INLINE
bool
default y if !OF_LIVE
+config ACPIGEN
+ bool "Support ACPI table generation in driver model"
+ default y if SANDBOX || GENERATE_ACPI_TABLE
+ help
+ This option enables generation of ACPI tables using driver-model
+ devices. It adds a new operation struct to each driver, to support
+ things like generating device-specific tables and returning the ACPI
+ name of a device.
+
endmenu
@@ -3,6 +3,7 @@
# Copyright (c) 2013 Google, Inc
obj-y += device.o fdtaddr.o lists.o root.o uclass.o util.o
+obj-$(CONFIG_$(SPL_TPL_)ACPIGEN) += acpi.o
obj-$(CONFIG_DEVRES) += devres.o
obj-$(CONFIG_$(SPL_)DM_DEVICE_REMOVE) += device-remove.o
obj-$(CONFIG_$(SPL_)SIMPLE_BUS) += simple-bus.o
new file mode 100644
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Core driver model support for ACPI table generation
+ *
+ * Copyright 2019 Google LLC
+ * Written by Simon Glass <sjg at chromium.org>
+ */
+
+#define LOG_CATEOGRY LOGC_ACPI
+
+#include <common.h>
+#include <dm.h>
+#include <dm/acpi.h>
+#include <dm/root.h>
+
+int acpi_copy_name(char *out_name, const char *name)
+{
+ strncpy(out_name, name, ACPI_NAME_MAX);
+ out_name[ACPI_NAME_LEN] = '\0';
+
+ return 0;
+}
+
+int acpi_get_name(const struct udevice *dev, char *out_name)
+{
+ struct acpi_ops *aops;
+
+ aops = device_get_acpi_ops(dev);
+ if (aops && aops->get_name)
+ return aops->get_name(dev, out_name);
+
+ return -ENOSYS;
+}
new file mode 100644
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Core ACPI (Advanced Configuration and Power Interface) support
+ *
+ * Copyright 2019 Google LLC
+ * Written by Simon Glass <sjg at chromium.org>
+ */
+
+#ifndef __DM_ACPI_H__
+#define __DM_ACPI_H__
+
+/* Allow operations to be optional for ACPI */
+#if CONFIG_IS_ENABLED(ACPIGEN)
+#define acpi_ops_ptr(_ptr) .acpi_ops = _ptr,
+#else
+#define acpi_ops_ptr(_ptr)
+#endif
+
+/* Length of an ACPI name string, excluding nul terminator */
+#define ACPI_NAME_LEN 4
+
+/* Length of an ACPI name string including nul terminator */
+#define ACPI_NAME_MAX (ACPI_NAME_LEN + 1)
+
+/**
+ * struct acpi_ops - ACPI operations supported by driver model
+ */
+struct acpi_ops {
+ /**
+ * get_name() - Obtain the ACPI name of a device
+ *
+ * @dev: Device to check
+ * @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
+ * bytes
+ * @return 0 if OK, -ENOENT if no name is available, other -ve value on
+ * other error
+ */
+ int (*get_name)(const struct udevice *dev, char *out_name);
+};
+
+#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
+
+/**
+ * acpi_get_name() - Obtain the ACPI name of a device
+ *
+ * @dev: Device to check
+ * @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
+ * bytes
+ * @return 0 if OK, -ENOENT if no name is available, other -ve value on
+ * other error
+ */
+int acpi_get_name(const struct udevice *dev, char *out_name);
+
+/**
+ * acpi_copy_name() - Copy an ACPI name to an output buffer
+ *
+ * This convenience function can be used to return a literal string as a name
+ * in functions that implement the get_name() method.
+ *
+ * For example:
+ *
+ * static int mydev_get_name(const struct udevice *dev, char *out_name)
+ * {
+ * return acpi_copy_name(out_name, "WIBB");
+ * }
+ *
+ * @out_name: Place to put the name
+ * @name: Name to copy
+ * @return 0 (always)
+ */
+int acpi_copy_name(char *out_name, const char *name);
+
+#endif
@@ -245,6 +245,8 @@ struct udevice_id {
* pointers defined by the driver, to implement driver functions required by
* the uclass.
* @flags: driver flags - see DM_FLAGS_...
+ * @acpi_ops: Advanced Configuration and Power Interface (ACPI) operations,
+ * allowing the device to add things to the ACPI tables passed to Linux
*/
struct driver {
char *name;
@@ -264,6 +266,9 @@ struct driver {
int per_child_platdata_auto_alloc_size;
const void *ops; /* driver-specific operations */
uint32_t flags;
+#if CONFIG_IS_ENABLED(ACPIGEN)
+ struct acpi_ops *acpi_ops;
+#endif
};
/* Declare a new U-Boot driver */
@@ -51,6 +51,8 @@ enum log_category_t {
LOGC_SANDBOX, /* Related to the sandbox board */
LOGC_BLOBLIST, /* Bloblist */
LOGC_DEVRES, /* Device resources (devres_... functions) */
+ /* Advanced Configuration and Power Interface (ACPI) */
+ LOGC_ACPI,
LOGC_COUNT, /* Number of log categories */
LOGC_END, /* Sentinel value for a list of log categories */