1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
13 * struct cpu_plat - platform data for a CPU
14 * @cpu_id: Platform-specific way of identifying the CPU.
15 * @ucode_version: Microcode version, if CPU_FEAT_UCODE is set
16 * @device_id: Driver-defined device identifier
17 * @family: DMTF CPU Family identifier
18 * @id: DMTF CPU Processor identifier
19 * @timebase_freq: the current frequency at which the cpu timer timebase
20 * registers are updated (in Hz)
22 * This can be accessed with dev_get_parent_plat() for any UCLASS_CPU
34 /* CPU features - mostly just a placeholder for now */
36 CPU_FEAT_L1_CACHE = 0, /* Supports level 1 cache */
37 CPU_FEAT_MMU = 1, /* Supports virtual memory */
38 CPU_FEAT_UCODE = 2, /* Requires/uses microcode */
39 CPU_FEAT_DEVICE_ID = 3, /* Provides a device ID */
45 * struct cpu_info - Information about a CPU
47 * @cpu_freq: Current CPU frequency in Hz
48 * @features: Flags for supported CPU features
49 * @address_width: Width of the CPU address space in bits (e.g. 32)
59 * get_desc() - Get a description string for a CPU
61 * @dev: Device to check (UCLASS_CPU)
62 * @buf: Buffer to place string
63 * @size: Size of string space
64 * @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
66 int (*get_desc)(const struct udevice *dev, char *buf, int size);
69 * get_info() - Get information about a CPU
71 * @dev: Device to check (UCLASS_CPU)
72 * @info: Returns CPU info
73 * @return 0 if OK, -ve on error
75 int (*get_info)(const struct udevice *dev, struct cpu_info *info);
78 * get_count() - Get number of CPUs
80 * @dev: Device to check (UCLASS_CPU)
81 * @return CPU count if OK, -ve on error
83 int (*get_count)(const struct udevice *dev);
86 * get_vendor() - Get vendor name of a CPU
88 * @dev: Device to check (UCLASS_CPU)
89 * @buf: Buffer to place string
90 * @size: Size of string space
91 * @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error
93 int (*get_vendor)(const struct udevice *dev, char *buf, int size);
96 * is_current() - Check if the CPU that U-Boot is currently running from
98 * @dev: Device to check (UCLASS_CPU)
99 * @return 1 if the CPU that U-Boot is currently running from, 0
102 int (*is_current)(struct udevice *dev);
105 #define cpu_get_ops(dev) ((struct cpu_ops *)(dev)->driver->ops)
108 * cpu_get_desc() - Get a description string for a CPU
109 * @dev: Device to check (UCLASS_CPU)
110 * @buf: Buffer to place string
111 * @size: Size of string space
113 * Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
115 int cpu_get_desc(const struct udevice *dev, char *buf, int size);
118 * cpu_get_info() - Get information about a CPU
119 * @dev: Device to check (UCLASS_CPU)
120 * @info: Returns CPU info
122 * Return: 0 if OK, -ve on error
124 int cpu_get_info(const struct udevice *dev, struct cpu_info *info);
127 * cpu_get_count() - Get number of CPUs
128 * @dev: Device to check (UCLASS_CPU)
130 * Return: CPU count if OK, -ve on error
132 int cpu_get_count(const struct udevice *dev);
135 * cpu_get_vendor() - Get vendor name of a CPU
136 * @dev: Device to check (UCLASS_CPU)
137 * @buf: Buffer to place string
138 * @size: Size of string space
140 * Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
142 int cpu_get_vendor(const struct udevice *dev, char *buf, int size);
145 * cpu_probe_all() - Probe all available CPUs
147 * Return: 0 if OK, -ve on error
149 int cpu_probe_all(void);
152 * cpu_is_current() - Check if the CPU that U-Boot is currently running from
154 * Return: 1 if yes, - 0 if not
156 int cpu_is_current(struct udevice *cpu);
159 * cpu_get_current_dev() - Get CPU udevice for current CPU
161 * Return: udevice if OK, - NULL on error
163 struct udevice *cpu_get_current_dev(void);