include/cpu.h

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef __CPU_H
   9 #define __CPU_H
  10
  11 /**
  12  * struct cpu_platdata - platform data for a CPU
  13  *
  14  * This can be accessed with dev_get_parent_platdata() for any UCLASS_CPU
  15  * device.
  16  *
  17  * @cpu_id:     Platform-specific way of identifying the CPU.
  18  * @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
  19  */
  20 struct cpu_platdata {
  21         int cpu_id;
  22         int ucode_version;
  23         ulong device_id;
  24 };
  25
  26 /* CPU features - mostly just a placeholder for now */
  27 enum {
  28         CPU_FEAT_L1_CACHE       = 0,    /* Supports level 1 cache */
  29         CPU_FEAT_MMU            = 1,    /* Supports virtual memory */
  30         CPU_FEAT_UCODE          = 2,    /* Requires/uses microcode */
  31         CPU_FEAT_DEVICE_ID      = 3,    /* Provides a device ID */
  32
  33         CPU_FEAT_COUNT,
  34 };
  35
  36 /**
  37  * struct cpu_info - Information about a CPU
  38  *
  39  * @cpu_freq:   Current CPU frequency in Hz
  40  * @features:   Flags for supported CPU features
  41  */
  42 struct cpu_info {
  43         ulong cpu_freq;
  44         ulong features;
  45 };
  46
  47 struct cpu_ops {
  48         /**
  49          * get_desc() - Get a description string for a CPU
  50          *
  51          * @dev:        Device to check (UCLASS_CPU)
  52          * @buf:        Buffer to place string
  53          * @size:       Size of string space
  54          * @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
  55          */
  56         int (*get_desc)(struct udevice *dev, char *buf, int size);
  57
  58         /**
  59          * get_info() - Get information about a CPU
  60          *
  61          * @dev:        Device to check (UCLASS_CPU)
  62          * @info:       Returns CPU info
  63          * @return 0 if OK, -ve on error
  64          */
  65         int (*get_info)(struct udevice *dev, struct cpu_info *info);
  66
  67         /**
  68          * get_count() - Get number of CPUs
  69          *
  70          * @dev:        Device to check (UCLASS_CPU)
  71          * @return CPU count if OK, -ve on error
  72          */
  73         int (*get_count)(struct udevice *dev);
  74 };
  75
  76 #define cpu_get_ops(dev)        ((struct cpu_ops *)(dev)->driver->ops)
  77
  78 /**
  79  * cpu_get_desc() - Get a description string for a CPU
  80  *
  81  * @dev:        Device to check (UCLASS_CPU)
  82  * @buf:        Buffer to place string
  83  * @size:       Size of string space
  84  * @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
  85  */
  86 int cpu_get_desc(struct udevice *dev, char *buf, int size);
  87
  88 /**
  89  * cpu_get_info() - Get information about a CPU
  90  *
  91  * @dev:        Device to check (UCLASS_CPU)
  92  * @info:       Returns CPU info
  93  * @return 0 if OK, -ve on error
  94  */
  95 int cpu_get_info(struct udevice *dev, struct cpu_info *info);
  96
  97 /**
  98  * cpu_get_count() - Get number of CPUs
  99  *
 100  * @dev:        Device to check (UCLASS_CPU)
 101  * @return CPU count if OK, -ve on error
 102  */
 103 int cpu_get_count(struct udevice *dev);
 104
 105 #endif