diff options
| author | Simon Glass <sjg@chromium.org> | 2015-04-28 20:25:09 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-04-29 21:02:33 -0600 |
| commit | 11f4dc1583c387fbb46d473c942c4bcfe5af303e (patch) | |
| tree | 109694befb15f2f476a8ce7f861680f06590ed3b /include | |
| parent | 33eac2dc25eb8b38d2991c61036d20f707fdd54f (diff) | |
| download | u-boot-11f4dc1583c387fbb46d473c942c4bcfe5af303e.tar.gz | |
dm: Implement a CPU uclass
It is useful to be able to keep track of the available CPUs in a multi-CPU
system. This uclass is mostly intended for use with SMP systems.
The uclass provides methods for getting basic information about each CPU.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/cpu.h | 84 | ||||
| -rw-r--r-- | include/dm/uclass-id.h | 1 |
2 files changed, 85 insertions, 0 deletions
diff --git a/include/cpu.h b/include/cpu.h new file mode 100644 index 0000000000..34c60bcbaa --- /dev/null +++ b/include/cpu.h @@ -0,0 +1,84 @@ +/* + * Copyright (c) 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __CPU_H +#define __CPU_H + +/** + * struct cpu_platdata - platform data for a CPU + * + * This can be accessed with dev_get_parent_platdata() for any UCLASS_CPU + * device. + * + * @cpu_id: Platform-specific way of identifying the CPU. + */ +struct cpu_platdata { + int cpu_id; +}; + +/* 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_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); +}; + +#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); + +#endif diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index fddfd35f1f..395e25a431 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -45,6 +45,7 @@ enum uclass_id { UCLASS_USB_HUB, /* USB hub */ UCLASS_USB_DEV_GENERIC, /* USB generic device */ UCLASS_MASS_STORAGE, /* Mass storage device */ + UCLASS_CPU, /* CPU, typically part of an SoC */ UCLASS_COUNT, UCLASS_INVALID = -1, |