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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>
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@ -2,6 +2,8 @@ menu "Device Drivers"
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source "drivers/core/Kconfig"
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source "drivers/cpu/Kconfig"
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source "drivers/demo/Kconfig"
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source "drivers/pci/Kconfig"
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@ -3,6 +3,7 @@ obj-$(CONFIG_DM_DEMO) += demo/
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obj-$(CONFIG_BIOSEMU) += bios_emulator/
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obj-y += block/
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obj-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount/
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obj-$(CONFIG_CPU) += cpu/
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obj-y += crypto/
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obj-$(CONFIG_FPGA) += fpga/
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obj-y += hwmon/
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8
drivers/cpu/Kconfig
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8
drivers/cpu/Kconfig
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@ -0,0 +1,8 @@
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config CPU
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bool "Enable CPU drivers using Driver Model"
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help
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This allows drivers to be provided for CPUs and their type to be
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specified in the board's device tree. For boards which support
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multiple CPUs, then normally have to be set up in U-Boot so that
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they can work correctly in the OS. This provides a framework for
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finding out information about available CPUs and making changes.
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7
drivers/cpu/Makefile
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7
drivers/cpu/Makefile
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@ -0,0 +1,7 @@
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#
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# Copyright (c) 2015 Google, Inc
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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obj-$(CONFIG_CPU) += cpu-uclass.o
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61
drivers/cpu/cpu-uclass.c
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61
drivers/cpu/cpu-uclass.c
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@ -0,0 +1,61 @@
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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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84
include/cpu.h
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84
include/cpu.h
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@ -0,0 +1,84 @@
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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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@ -45,6 +45,7 @@ enum uclass_id {
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UCLASS_USB_HUB, /* USB hub */
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UCLASS_USB_DEV_GENERIC, /* USB generic device */
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UCLASS_MASS_STORAGE, /* Mass storage device */
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UCLASS_CPU, /* CPU, typically part of an SoC */
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UCLASS_COUNT,
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UCLASS_INVALID = -1,
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