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166 lines
4.1 KiB
166 lines
4.1 KiB
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __CPU_H
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#define __CPU_H
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struct udevice;
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/**
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* struct cpu_plat - platform data for a CPU
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* @cpu_id: Platform-specific way of identifying the CPU.
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* @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
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* @device_id: Driver-defined device identifier
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* @family: DMTF CPU Family identifier
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* @id: DMTF CPU Processor identifier
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* @timebase_freq: the current frequency at which the cpu timer timebase
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* registers are updated (in Hz)
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*
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* This can be accessed with dev_get_parent_plat() for any UCLASS_CPU
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* device.
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*/
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struct cpu_plat {
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int cpu_id;
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int ucode_version;
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ulong device_id;
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u16 family;
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u32 id[2];
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u32 timebase_freq;
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};
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/* CPU features - mostly just a placeholder for now */
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enum {
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CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */
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CPU_FEAT_MMU = 1, /* Supports virtual memory */
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CPU_FEAT_UCODE = 2, /* Requires/uses microcode */
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CPU_FEAT_DEVICE_ID = 3, /* Provides a device ID */
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CPU_FEAT_COUNT,
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};
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/**
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* struct cpu_info - Information about a CPU
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*
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* @cpu_freq: Current CPU frequency in Hz
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* @features: Flags for supported CPU features
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* @address_width: Width of the CPU address space in bits (e.g. 32)
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*/
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struct cpu_info {
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ulong cpu_freq;
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ulong features;
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uint address_width;
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};
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struct cpu_ops {
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/**
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* get_desc() - Get a description string for a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @buf: Buffer to place string
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* @size: Size of string space
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* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
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*/
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int (*get_desc)(const struct udevice *dev, char *buf, int size);
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/**
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* get_info() - Get information about a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @info: Returns CPU info
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* @return 0 if OK, -ve on error
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*/
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int (*get_info)(const struct udevice *dev, struct cpu_info *info);
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/**
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* get_count() - Get number of CPUs
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*
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* @dev: Device to check (UCLASS_CPU)
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* @return CPU count if OK, -ve on error
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*/
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int (*get_count)(const struct udevice *dev);
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/**
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* get_vendor() - Get vendor name of a CPU
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*
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* @dev: Device to check (UCLASS_CPU)
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* @buf: Buffer to place string
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* @size: Size of string space
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* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
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*/
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int (*get_vendor)(const struct udevice *dev, char *buf, int size);
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/**
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* is_current() - Check if the CPU that U-Boot is currently running from
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*
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* @dev: Device to check (UCLASS_CPU)
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* @return 1 if the CPU that U-Boot is currently running from, 0
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* if not.
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*/
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int (*is_current)(struct udevice *dev);
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};
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#define cpu_get_ops(dev) ((struct cpu_ops *)(dev)->driver->ops)
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/**
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* cpu_get_desc() - Get a description string for a CPU
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* @dev: Device to check (UCLASS_CPU)
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* @buf: Buffer to place string
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* @size: Size of string space
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*
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* Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
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*/
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int cpu_get_desc(const struct udevice *dev, char *buf, int size);
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/**
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* cpu_get_info() - Get information about a CPU
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* @dev: Device to check (UCLASS_CPU)
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* @info: Returns CPU info
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*
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* Return: 0 if OK, -ve on error
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*/
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int cpu_get_info(const struct udevice *dev, struct cpu_info *info);
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/**
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* cpu_get_count() - Get number of CPUs
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* @dev: Device to check (UCLASS_CPU)
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*
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* Return: CPU count if OK, -ve on error
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*/
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int cpu_get_count(const struct udevice *dev);
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/**
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* cpu_get_vendor() - Get vendor name of a CPU
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* @dev: Device to check (UCLASS_CPU)
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* @buf: Buffer to place string
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* @size: Size of string space
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*
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* Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
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*/
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int cpu_get_vendor(const struct udevice *dev, char *buf, int size);
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/**
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* cpu_probe_all() - Probe all available CPUs
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*
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* Return: 0 if OK, -ve on error
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*/
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int cpu_probe_all(void);
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/**
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* cpu_is_current() - Check if the CPU that U-Boot is currently running from
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*
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* Return: 1 if yes, - 0 if not
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*/
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int cpu_is_current(struct udevice *cpu);
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/**
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* cpu_get_current_dev() - Get CPU udevice for current CPU
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*
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* Return: udevice if OK, - NULL on error
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*/
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struct udevice *cpu_get_current_dev(void);
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#endif
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