“MMC overview”的版本间的差异

来自百问网嵌入式Linux wiki
 
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'''SUMMARY '''<br>
 
'''SUMMARY '''<br>
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The MMC (MultiMediaCard) / SD (secure digital) / SDIO (secure digital input/output) subsystem implements a standard Linux<sup>&reg;</sup> host driver to interface with MMC / SD memory cards or SDIO cards.
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MMC（MultiMediaCard）/ SD（安全数字）/ SDIO（安全数字输入/输出）子系统实现了标准的Linux <sup>&reg;</ sup>主机驱动程序，可与MMC / SD存储卡或SDIO卡接口。
  
 
== Framework purpose ==
 
== Framework purpose ==
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The purpose of this article is to introduce the MMC Linux<sup>&reg;</sup> subsystem (MMC / SD) by:
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本文的目的是通过以下方式介绍MMC Linux<sup>&reg;</sup>子系统(MMC/SD)：
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* providing general information
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* 提供一般信息
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* describing the main components/stakeholders
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* 描述主要组成部分/利益相关者
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SDIO在[[WLAN_overview|WLAN overview]]中解决。
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The SDIO is addressed in the [[WLAN_overview|WLAN overview]].
 
  
 
==System overview==
 
==System overview==
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===Component description===
 
===Component description===
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* User space applications handle '''file I/O''' management to view the card memory as a disk, whereas programs that perform '''raw I/O''' accesses see the memory as a block device<ref>https://en.wikipedia.org/wiki/Device_file#Block_devices</ref>.
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* 用户空间应用程序处理'''文件I / O'''管理以将卡存储器视为磁盘，而执行'''原始I / O'''访问的程序将存储器视为块设备。<ref>https://en.wikipedia.org/wiki/Device_file#Block_devices</ref>.
  
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* '''VFS''' (Kernel space)
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* '''VFS''' (内核空间)
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Virtual File System. Please refer to the VFS documentation <ref>{{CodeSource | Linux kernel | Documentation/filesystems/vfs.txt | VFS}} </ref>.
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虚拟文件系统。 请参考VFS文档<ref>{{CodeSource | Linux kernel | Documentation/filesystems/vfs.txt | VFS}} </ref>.
  
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* '''MMC core/SD/MMC/SDIO''' (Kernel space)
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* '''MMC core/SD/MMC/SDIO''' (内核空间)
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The '''MMC core''' ensures compliance with MultiMediaCard ('''MMC''')<ref>[https://www.jedec.org/standards-documents/technology-focus-areas/flash-memory-ssds-ufs-emmc/e-mmc MultiMediaCard], embedded MultiMediaCard specification</ref> / secure digital ('''SD''')<ref>[https://www.sdcard.org/ Secure Digital], secure digital specification</ref> / secure digital input/output ('''SDIO''')<ref>[https://www.sdcard.org/ Secure Digital Input Output], Secure Digital Input Output specification</ref>.
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'''MMC核心'''确保与MultiMediaCard（'''MMC'''）兼容。<ref>[https://www.jedec.org/standards-documents/technology-focus-areas/flash-memory-ssds-ufs-emmc/e-mmc MultiMediaCard], embedded MultiMediaCard specification</ref> /安全数字（'''SD'''） ('''SD''')<ref>[https://www.sdcard.org/ Secure Digital], secure digital specification</ref> /安全数字输入/输出（'''SDIO'''）<ref>[https://www.sdcard.org/ Secure Digital Input Output], Secure Digital Input Output specification</ref>.
  
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* '''SDMMC driver''' (Kernel space) / '''SDMMC''' (hardware)  
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* '''SDMMC driver''' (内核空间) / '''SDMMC''' (硬件)  
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The '''SDMMC driver''' handles:
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'''SDMMC驱动程序'''处理：
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* the registers, the clock, the interrupt and the IDMA control.
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* 寄存器，时钟，中断和IDMA控制。
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* the communications over the bus based on command/response and data transfers.
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* 基于命令/响应和数据传输的总线上的通信。
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Please refer to the [[SDMMC internal peripheral]].
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请参阅[[SDMMC internal peripheral]].
  
 
===API description===
 
===API description===
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The MMC core handles the file system read/write calls.
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MMC核心处理文件系统读/写调用。
  
 
==Configuration ==
 
==Configuration ==
 
===Kernel configuration===
 
===Kernel configuration===
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The MMC framework is activated by default in ST deliveries. If a specific configuration is needed, this section indicates how the MMC framework can be activated/inactivated in the kernel.
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在ST交付中，默认情况下会激活MMC框架。 如果需要特定的配置，则本节说明如何在内核中激活/禁用MMC框架。
  
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The MMC framework can be activated in the kernel configuration via Linux<sup>&reg;</sup> Menuconfig tool: [[Menuconfig or how to configure kernel]]
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可以通过Linux<sup>&reg;</sup>Menuconfig工具在内核配置中激活MMC框架: [[Menuconfig or how to configure kernel]]
  
 
<pre>
 
<pre>
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===Device tree configuration===
 
===Device tree configuration===
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DT configuration can be done thanks to [[STM32CubeMX]].
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借助 [[STM32CubeMX]]可以完成DT配置。
  
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Please refer to the [[SDMMC_device_tree_configuration| SDMMC device tree configuration]].
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请参考[[SDMMC_device_tree_configuration| SDMMC device tree configuration]].
  
 
==How to use the framework==
 
==How to use the framework==
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A file system, which handles read/write/erase operations, can be used with the MMC framework. Please refer to the [[How to support EXT4 through MMC|EXT4 support through MMC]].
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MMC框架可以使用处理读/写/擦除操作的文件系统。 请参考 [[How to support EXT4 through MMC|EXT4 support through MMC]].
  
  
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===How to monitor===
 
===How to monitor===
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The sysfs interface provides detailed information on each mmc device:
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sysfs界面提供有关每个mmc设备的详细信息：
  
 
<pre>
 
<pre>
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===How to trace===
 
===How to trace===
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For details on dynamic trace usage, refer to [[How to use the kernel dynamic debug]].
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有关动态跟踪用法的详细信息，请参阅 [[How to use the kernel dynamic debug]].
  
 
root:~# echo "file drivers/mmc/* +p" > /sys/kernel/debug/dynamic_debug/control
 
root:~# echo "file drivers/mmc/* +p" > /sys/kernel/debug/dynamic_debug/control
  
 
==Source code location==
 
==Source code location==
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The MMC framework is available {{CodeSource | Linux kernel | drivers/mmc  | here}}.
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MMC框架可用 {{CodeSource | Linux kernel | drivers/mmc  | here}}.
  
 
==References==
 
==References==
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Please refer to the following links for a full description of the MMC framework:
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请参考以下链接以获得MMC框架的完整说明：
  
 
<references />
 
<references />
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<noinclude>
 
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{{ArticleBasedOnModel | Framework overview article model}}
 
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[[Category:Mass storage]]
 
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</noinclude>
 

2020年11月10日 (二) 11:02的最新版本

SUMMARY
MMC（MultiMediaCard）/ SD（安全数字）/ SDIO（安全数字输入/输出）子系统实现了标准的Linux ®</ sup>主机驱动程序，可与MMC / SD存储卡或SDIO卡接口。

Framework purpose

本文的目的是通过以下方式介绍MMC Linux®子系统(MMC/SD)：

  • 提供一般信息
  • 描述主要组成部分/利益相关者

SDIO在WLAN overview中解决。

System overview

MMC overview.png

Component description

  • 用户空间应用程序处理文件I / O管理以将卡存储器视为磁盘，而执行原始I / O访问的程序将存储器视为块设备。[1].
  • VFS (内核空间)

虚拟文件系统。 请参考VFS文档[2].

  • MMC core/SD/MMC/SDIO (内核空间)

MMC核心确保与MultiMediaCard（MMC）兼容。[3] /安全数字（SD） (SD)[4] /安全数字输入/输出（SDIO）[5].

  • SDMMC driver (内核空间) / SDMMC (硬件)

SDMMC驱动程序处理：

  • 寄存器，时钟，中断和IDMA控制。
  • 基于命令/响应和数据传输的总线上的通信。

请参阅SDMMC internal peripheral.

API description

MMC核心处理文件系统读/写调用。

Configuration

Kernel configuration

在ST交付中，默认情况下会激活MMC框架。 如果需要特定的配置，则本节说明如何在内核中激活/禁用MMC框架。

可以通过Linux®Menuconfig工具在内核配置中激活MMC框架: Menuconfig or how to configure kernel 

[*] Device Drivers
    [*] MMC/SD/SDIO card support
        <*> HW reset support for eMMC
        <*> Simple HW reset support for MMC
        <*> MMC block device driver
            (16) Number of minors per block device
        ...
        <*> ARM AMBA Multimedia Card Interface support
        [*] STMicroelectronics STM32 SDMMC Controller

Device tree configuration

借助 STM32CubeMX可以完成DT配置。

请参考 SDMMC device tree configuration.

How to use the framework

MMC框架可以使用处理读/写/擦除操作的文件系统。 请参考 EXT4 support through MMC.


How to trace and debug the framework

How to monitor

sysfs界面提供有关每个mmc设备的详细信息： 

root:~# cat /sys/kernel/debug/mmc0/ios
clock:          50000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    2 (sd high-speed)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)

How to trace

有关动态跟踪用法的详细信息，请参阅 How to use the kernel dynamic debug.

root:~# echo "file drivers/mmc/* +p" > /sys/kernel/debug/dynamic_debug/control

Source code location

MMC框架可用 drivers/mmc | |}} here .

References

请参考以下链接以获得MMC框架的完整说明：

  1. ↑ https://en.wikipedia.org/wiki/Device_file#Block_devices
  2. ↑ Documentation/filesystems/vfs.txt | |}} VFS
  3. ↑ MultiMediaCard, embedded MultiMediaCard specification
  4. ↑ Secure Digital, secure digital specification
  5. ↑ Secure Digital Input Output, Secure Digital Input Output specification
取自“http://wiki.100ask.org/index.php?title=MMC_overview&oldid=7776”