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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
#include <linux/types.h>
struct udevice;
/**
* struct cpu_plat - 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_plat() for any UCLASS_CPU
* device.
*/
struct cpu_plat {
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
* @address_width: Width of the CPU address space in bits (e.g. 32)
*/
struct cpu_info {
ulong cpu_freq;
ulong features;
uint address_width;
};
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)(const 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)(const 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)(const 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)(const struct udevice *dev, char *buf, int size);
/**
* is_current() - Check if the CPU that U-Boot is currently running from
*
* @dev: Device to check (UCLASS_CPU)
* @return 1 if the CPU that U-Boot is currently running from, 0
* if not.
*/
int (*is_current)(struct udevice *dev);
/**
* release_core() - Relase a CPU core to the given address to run application
*
* @dev: Device to check (UCLASS_CPU)
* @addr: Address to relese the CPU core
* @return 0 if OK, -ve on error
*/
int (*release_core)(const struct udevice *dev, phys_addr_t addr);
};
#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(const 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(const 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(const 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(const 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);
/**
* cpu_is_current() - Check if the CPU that U-Boot is currently running from
*
* Return: 1 if yes, - 0 if not
*/
int cpu_is_current(struct udevice *cpu);
/**
* cpu_get_current_dev() - Get CPU udevice for current CPU
*
* Return: udevice if OK, - NULL on error
*/
struct udevice *cpu_get_current_dev(void);
/**
* cpu_release_core() - Relase a CPU core to the given address to run application
*
* @return 0 if OK, -ve on error
*/
int cpu_release_core(const struct udevice *dev, phys_addr_t addr);
/**
* cpu_phys_address_size() - Get the physical-address size for the CPU
*
* x86 CPUs have a setting which indicates how many bits of address space are
* available on the CPU. This is 32 for older CPUs but newer ones may support 36
* or more.
*
* For non-x86 CPUs the result may simply be 32 for 32-bit CPUS or 64 for 64-bit
*
* Return: address size (typically 32 or 36)
*/
int cpu_phys_address_size(void);
#endif
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