mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
dc7a12bdfc
Converts ARM the text files to ReST, preparing them to be an architecture book. The conversion is actually: - add blank lines and identation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. 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> Reviewed-by Corentin Labbe <clabbe.montjoie@gmail.com> # For sun4i-ss
92 lines
2.4 KiB
ReStructuredText
92 lines
2.4 KiB
ReStructuredText
========================
|
|
S3C24XX USB Host support
|
|
========================
|
|
|
|
|
|
|
|
Introduction
|
|
------------
|
|
|
|
This document details the S3C2410/S3C2440 in-built OHCI USB host support.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
Enable at least the following kernel options:
|
|
|
|
menuconfig::
|
|
|
|
Device Drivers --->
|
|
USB support --->
|
|
<*> Support for Host-side USB
|
|
<*> OHCI HCD support
|
|
|
|
|
|
.config:
|
|
|
|
- CONFIG_USB
|
|
- CONFIG_USB_OHCI_HCD
|
|
|
|
|
|
Once these options are configured, the standard set of USB device
|
|
drivers can be configured and used.
|
|
|
|
|
|
Board Support
|
|
-------------
|
|
|
|
The driver attaches to a platform device, which will need to be
|
|
added by the board specific support file in linux/arch/arm/mach-s3c2410,
|
|
such as mach-bast.c or mach-smdk2410.c
|
|
|
|
The platform device's platform_data field is only needed if the
|
|
board implements extra power control or over-current monitoring.
|
|
|
|
The OHCI driver does not ensure the state of the S3C2410's MISCCTRL
|
|
register, so if both ports are to be used for the host, then it is
|
|
the board support file's responsibility to ensure that the second
|
|
port is configured to be connected to the OHCI core.
|
|
|
|
|
|
Platform Data
|
|
-------------
|
|
|
|
See arch/arm/mach-s3c2410/include/mach/usb-control.h for the
|
|
descriptions of the platform device data. An implementation
|
|
can be found in linux/arch/arm/mach-s3c2410/usb-simtec.c .
|
|
|
|
The `struct s3c2410_hcd_info` contains a pair of functions
|
|
that get called to enable over-current detection, and to
|
|
control the port power status.
|
|
|
|
The ports are numbered 0 and 1.
|
|
|
|
power_control:
|
|
Called to enable or disable the power on the port.
|
|
|
|
enable_oc:
|
|
Called to enable or disable the over-current monitoring.
|
|
This should claim or release the resources being used to
|
|
check the power condition on the port, such as an IRQ.
|
|
|
|
report_oc:
|
|
The OHCI driver fills this field in for the over-current code
|
|
to call when there is a change to the over-current state on
|
|
an port. The ports argument is a bitmask of 1 bit per port,
|
|
with bit X being 1 for an over-current on port X.
|
|
|
|
The function s3c2410_usb_report_oc() has been provided to
|
|
ensure this is called correctly.
|
|
|
|
port[x]:
|
|
This is struct describes each port, 0 or 1. The platform driver
|
|
should set the flags field of each port to S3C_HCDFLG_USED if
|
|
the port is enabled.
|
|
|
|
|
|
|
|
Document Author
|
|
---------------
|
|
|
|
Ben Dooks, Copyright 2005 Simtec Electronics
|