cpu.h
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __CPU_H
#define __CPU_H
/**
* struct cpu_platdata - platform data for a CPU
* @cpu_id: Platform-specific way of identifying the CPU.
* @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
* @device_id: Driver-defined device identifier
* @family: DMTF CPU Family identifier
* @id: DMTF CPU Processor identifier
* @timebase_freq: the current frequency at which the cpu timer timebase
* registers are updated (in Hz)
*
* This can be accessed with dev_get_parent_platdata() for any UCLASS_CPU
* device.
*/
struct cpu_platdata {
int cpu_id;
int ucode_version;
ulong device_id;
u16 family;
u32 id[2];
u32 timebase_freq;
};
/* 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_UCODE = 2, /* Requires/uses microcode */
CPU_FEAT_DEVICE_ID = 3, /* Provides a device ID */
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);
/**
* get_count() - Get number of CPUs
*
* @dev: Device to check (UCLASS_CPU)
* @return CPU count if OK, -ve on error
*/
int (*get_count)(struct udevice *dev);
/**
* get_vendor() - Get vendor name of 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_vendor)(struct udevice *dev, char *buf, int size);
};
#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);
/**
* cpu_get_count() - Get number of CPUs
* @dev: Device to check (UCLASS_CPU)
*
* Return: CPU count if OK, -ve on error
*/
int cpu_get_count(struct udevice *dev);
/**
* cpu_get_vendor() - Get vendor name of 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_vendor(struct udevice *dev, char *buf, int size);
/**
* cpu_probe_all() - Probe all available CPUs
*
* Return: 0 if OK, -ve on error
*/
int cpu_probe_all(void);
#endif