| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293 |
- 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
|
