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docs: mmc: convert to ReST

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Rename the mmc documentation files to ReST, add an
index for them and adjust in order to produce a nice html
output via the Sphinx build system.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2019-04-18 14:44:06 -03:00
parent 8ea0afa3b8
commit f408510c4f
5 changed files with 79 additions and 37 deletions
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13
Documentation/mmc/index.rst Normal file
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@ -0,0 +1,13 @@
:orphan:
========================
MMC/SD/SDIO card support
========================
.. toctree::
:maxdepth: 1
mmc-dev-attrs
mmc-dev-parts
mmc-async-req
mmc-tools

53
Documentation/mmc/mmc-async-req.txt → Documentation/mmc/mmc-async-req.rst
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@ -1,13 +1,20 @@
========================
MMC Asynchronous Request
========================
Rationale
=========
How significant is the cache maintenance overhead?
It depends. Fast eMMC and multiple cache levels with speculative cache
pre-fetch makes the cache overhead relatively significant. If the DMA
preparations for the next request are done in parallel with the current
transfer, the DMA preparation overhead would not affect the MMC performance.
The intention of non-blocking (asynchronous) MMC requests is to minimize the
time between when an MMC request ends and another MMC request begins.
Using mmc_wait_for_req(), the MMC controller is idle while dma_map_sg and
dma_unmap_sg are processing. Using non-blocking MMC requests makes it
possible to prepare the caches for next job in parallel with an active
@ -17,6 +24,7 @@ MMC block driver
================
The mmc_blk_issue_rw_rq() in the MMC block driver is made non-blocking.
The increase in throughput is proportional to the time it takes to
prepare (major part of preparations are dma_map_sg() and dma_unmap_sg())
a request and how fast the memory is. The faster the MMC/SD is the
@ -35,6 +43,7 @@ MMC core API extension
======================
There is one new public function mmc_start_req().
It starts a new MMC command request for a host. The function isn't
truly non-blocking. If there is an ongoing async request it waits
for completion of that request and starts the new one and returns. It
@ -47,6 +56,7 @@ MMC host extensions
There are two optional members in the mmc_host_ops -- pre_req() and
post_req() -- that the host driver may implement in order to move work
to before and after the actual mmc_host_ops.request() function is called.
In the DMA case pre_req() may do dma_map_sg() and prepare the DMA
descriptor, and post_req() runs the dma_unmap_sg().
@ -55,33 +65,34 @@ Optimize for the first request
The first request in a series of requests can't be prepared in parallel
with the previous transfer, since there is no previous request.
The argument is_first_req in pre_req() indicates that there is no previous
request. The host driver may optimize for this scenario to minimize
the performance loss. A way to optimize for this is to split the current
request in two chunks, prepare the first chunk and start the request,
and finally prepare the second chunk and start the transfer.
Pseudocode to handle is_first_req scenario with minimal prepare overhead:
Pseudocode to handle is_first_req scenario with minimal prepare overhead::
if (is_first_req && req->size > threshold)
/* start MMC transfer for the complete transfer size */
mmc_start_command(MMC_CMD_TRANSFER_FULL_SIZE);
if (is_first_req && req->size > threshold)
/* start MMC transfer for the complete transfer size */
mmc_start_command(MMC_CMD_TRANSFER_FULL_SIZE);
/*
* Begin to prepare DMA while cmd is being processed by MMC.
* The first chunk of the request should take the same time
* to prepare as the "MMC process command time".
* If prepare time exceeds MMC cmd time
* the transfer is delayed, guesstimate max 4k as first chunk size.
*/
prepare_1st_chunk_for_dma(req);
/* flush pending desc to the DMAC (dmaengine.h) */
dma_issue_pending(req->dma_desc);
/*
* Begin to prepare DMA while cmd is being processed by MMC.
* The first chunk of the request should take the same time
* to prepare as the "MMC process command time".
* If prepare time exceeds MMC cmd time
* the transfer is delayed, guesstimate max 4k as first chunk size.
*/
prepare_1st_chunk_for_dma(req);
/* flush pending desc to the DMAC (dmaengine.h) */
dma_issue_pending(req->dma_desc);
prepare_2nd_chunk_for_dma(req);
/*
* The second issue_pending should be called before MMC runs out
* of the first chunk. If the MMC runs out of the first data chunk
* before this call, the transfer is delayed.
*/
dma_issue_pending(req->dma_desc);
prepare_2nd_chunk_for_dma(req);
/*
* The second issue_pending should be called before MMC runs out
* of the first chunk. If the MMC runs out of the first data chunk
* before this call, the transfer is delayed.
*/
dma_issue_pending(req->dma_desc);

32
Documentation/mmc/mmc-dev-attrs.txt → Documentation/mmc/mmc-dev-attrs.rst
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@ -1,3 +1,4 @@
==================================
SD and MMC Block Device Attributes
==================================
@ -6,23 +7,29 @@ SD or MMC device.
The following attributes are read/write.
force_ro Enforce read-only access even if write protect switch is off.
======== ===============================================
force_ro Enforce read-only access even if write protect switch is off.
======== ===============================================
SD and MMC Device Attributes
============================
All attributes are read-only.
====================== ===============================================
cid Card Identification Register
csd Card Specific Data Register
scr SD Card Configuration Register (SD only)
date Manufacturing Date (from CID Register)
fwrev Firmware/Product Revision (from CID Register) (SD and MMCv1 only)
hwrev Hardware/Product Revision (from CID Register) (SD and MMCv1 only)
fwrev Firmware/Product Revision (from CID Register)
(SD and MMCv1 only)
hwrev Hardware/Product Revision (from CID Register)
(SD and MMCv1 only)
manfid Manufacturer ID (from CID Register)
name Product Name (from CID Register)
oemid OEM/Application ID (from CID Register)
prv Product Revision (from CID Register) (SD and MMCv4 only)
prv Product Revision (from CID Register)
(SD and MMCv4 only)
serial Product Serial Number (from CID Register)
erase_size Erase group size
preferred_erase_size Preferred erase size
@ -30,7 +37,10 @@ All attributes are read-only.
rel_sectors Reliable write sector count
ocr Operation Conditions Register
dsr Driver Stage Register
cmdq_en Command Queue enabled: 1 => enabled, 0 => not enabled
cmdq_en Command Queue enabled:
1 => enabled, 0 => not enabled
====================== ===============================================
Note on Erase Size and Preferred Erase Size:
@ -44,14 +54,15 @@ Note on Erase Size and Preferred Erase Size:
SD/MMC cards can erase an arbitrarily large area up to and
including the whole card. When erasing a large area it may
be desirable to do it in smaller chunks for three reasons:
1. A single erase command will make all other I/O on
1. A single erase command will make all other I/O on
the card wait. This is not a problem if the whole card
is being erased, but erasing one partition will make
I/O for another partition on the same card wait for the
duration of the erase - which could be a several
minutes.
2. To be able to inform the user of erase progress.
3. The erase timeout becomes too large to be very
2. To be able to inform the user of erase progress.
3. The erase timeout becomes too large to be very
useful. Because the erase timeout contains a margin
which is multiplied by the size of the erase area,
the value can end up being several minutes for large
@ -72,6 +83,9 @@ Note on Erase Size and Preferred Erase Size:
"preferred_erase_size" is in bytes.
Note on raw_rpmb_size_mult:
"raw_rpmb_size_mult" is a multiple of 128kB block.
RPMB size in byte is calculated by using the following equation:
RPMB partition size = 128kB x raw_rpmb_size_mult
RPMB partition size = 128kB x raw_rpmb_size_mult

13
Documentation/mmc/mmc-dev-parts.txt → Documentation/mmc/mmc-dev-parts.rst
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@ -1,3 +1,4 @@
============================
SD and MMC Device Partitions
============================
@ -18,18 +19,18 @@ platform, write access is disabled by default to reduce the chance of
accidental bricking.
To enable write access to /dev/mmcblkXbootY, disable the forced read-only
access with:
access with::
echo 0 > /sys/block/mmcblkXbootY/force_ro
echo 0 > /sys/block/mmcblkXbootY/force_ro
To re-enable read-only access:
To re-enable read-only access::
echo 1 > /sys/block/mmcblkXbootY/force_ro
echo 1 > /sys/block/mmcblkXbootY/force_ro
The boot partitions can also be locked read only until the next power on,
with:
with::
echo 1 > /sys/block/mmcblkXbootY/ro_lock_until_next_power_on
echo 1 > /sys/block/mmcblkXbootY/ro_lock_until_next_power_on
This is a feature of the card and not of the kernel. If the card does
not support boot partition locking, the file will not exist. If the

5
Documentation/mmc/mmc-tools.txt → Documentation/mmc/mmc-tools.rst
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@ -1,14 +1,17 @@
======================
MMC tools introduction
======================
There is one MMC test tools called mmc-utils, which is maintained by Chris Ball,
you can find it at the below public git repository:
http://git.kernel.org/cgit/linux/kernel/git/cjb/mmc-utils.git/
http://git.kernel.org/cgit/linux/kernel/git/cjb/mmc-utils.git/
Functions
=========
The mmc-utils tools can do the following:
- Print and parse extcsd data.
- Determine the eMMC writeprotect status.
- Set the eMMC writeprotect status.