u-boot/include/cpu.h
Simon Glass 11f4dc1583 dm: Implement a CPU uclass
It is useful to be able to keep track of the available CPUs in a multi-CPU
system. This uclass is mostly intended for use with SMP systems.

The uclass provides methods for getting basic information about each CPU.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2015-04-29 21:02:33 -06:00

85 lines
1.9 KiB
C

/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __CPU_H
#define __CPU_H
/**
* struct cpu_platdata - platform data for a CPU
*
* This can be accessed with dev_get_parent_platdata() for any UCLASS_CPU
* device.
*
* @cpu_id: Platform-specific way of identifying the CPU.
*/
struct cpu_platdata {
int cpu_id;
};
/* CPU features - mostly just a placeholder for now */
enum {
CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */
CPU_FEAT_MMU = 1, /* Supports virtual memory */
CPU_FEAT_COUNT,
};
/**
* struct cpu_info - Information about a CPU
*
* @cpu_freq: Current CPU frequency in Hz
* @features: Flags for supported CPU features
*/
struct cpu_info {
ulong cpu_freq;
ulong features;
};
struct cpu_ops {
/**
* get_desc() - Get a description string for a CPU
*
* @dev: Device to check (UCLASS_CPU)
* @buf: Buffer to place string
* @size: Size of string space
* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
*/
int (*get_desc)(struct udevice *dev, char *buf, int size);
/**
* get_info() - Get information about a CPU
*
* @dev: Device to check (UCLASS_CPU)
* @info: Returns CPU info
* @return 0 if OK, -ve on error
*/
int (*get_info)(struct udevice *dev, struct cpu_info *info);
};
#define cpu_get_ops(dev) ((struct cpu_ops *)(dev)->driver->ops)
/**
* cpu_get_desc() - Get a description string for a CPU
*
* @dev: Device to check (UCLASS_CPU)
* @buf: Buffer to place string
* @size: Size of string space
* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
*/
int cpu_get_desc(struct udevice *dev, char *buf, int size);
/**
* cpu_get_info() - Get information about a CPU
*
* @dev: Device to check (UCLASS_CPU)
* @info: Returns CPU info
* @return 0 if OK, -ve on error
*/
int cpu_get_info(struct udevice *dev, struct cpu_info *info);
#endif