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>master
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config CPU |
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bool "Enable CPU drivers using Driver Model" |
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help |
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This allows drivers to be provided for CPUs and their type to be |
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specified in the board's device tree. For boards which support |
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multiple CPUs, then normally have to be set up in U-Boot so that |
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they can work correctly in the OS. This provides a framework for |
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finding out information about available CPUs and making changes. |
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#
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# Copyright (c) 2015 Google, Inc
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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obj-$(CONFIG_CPU) += cpu-uclass.o
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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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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <cpu.h> |
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#include <dm.h> |
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#include <dm/lists.h> |
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#include <dm/root.h> |
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int cpu_get_desc(struct udevice *dev, char *buf, int size) |
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{ |
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struct cpu_ops *ops = cpu_get_ops(dev); |
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if (!ops->get_desc) |
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return -ENOSYS; |
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return ops->get_desc(dev, buf, size); |
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} |
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int cpu_get_info(struct udevice *dev, struct cpu_info *info) |
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{ |
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struct cpu_ops *ops = cpu_get_ops(dev); |
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if (!ops->get_desc) |
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return -ENOSYS; |
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return ops->get_info(dev, info); |
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} |
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U_BOOT_DRIVER(cpu_bus) = { |
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.name = "cpu_bus", |
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.id = UCLASS_SIMPLE_BUS, |
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.per_child_platdata_auto_alloc_size = sizeof(struct cpu_platdata), |
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}; |
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static int uclass_cpu_init(struct uclass *uc) |
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{ |
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struct udevice *dev; |
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int node; |
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int ret; |
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node = fdt_path_offset(gd->fdt_blob, "/cpus"); |
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if (node < 0) |
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return 0; |
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ret = device_bind_driver_to_node(dm_root(), "cpu_bus", "cpus", node, |
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&dev); |
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return ret; |
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} |
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UCLASS_DRIVER(cpu) = { |
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.id = UCLASS_CPU, |
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.name = "cpu", |
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.flags = DM_UC_FLAG_SEQ_ALIAS, |
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.init = uclass_cpu_init, |
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}; |
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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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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#ifndef __CPU_H |
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#define __CPU_H |
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/**
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* struct cpu_platdata - platform data for a CPU |
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* |
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* This can be accessed with dev_get_parent_platdata() for any UCLASS_CPU |
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* device. |
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* |
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* @cpu_id: Platform-specific way of identifying the CPU. |
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*/ |
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struct cpu_platdata { |
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int cpu_id; |
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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_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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*/ |
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struct cpu_info { |
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ulong cpu_freq; |
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ulong features; |
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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)(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)(struct udevice *dev, struct cpu_info *info); |
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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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* |
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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 cpu_get_desc(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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* |
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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 cpu_get_info(struct udevice *dev, struct cpu_info *info); |
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#endif |
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