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author | Jeff Garzik <jgarzik@pobox.com> | 2005-08-11 00:07:03 -0400 |
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committer | Jeff Garzik <jgarzik@pobox.com> | 2005-08-11 00:07:03 -0400 |
commit | cd04b947bc674f8fc9cac38ec30497bae5d664ad (patch) | |
tree | 988b0b7ea08063e5499672346eb2f619f0629717 /Documentation/arm/Samsung-S3C24XX/USB-Host.txt | |
parent | b3df9f813bc7b9db62ae0c90b8990b1cebf97345 (diff) | |
parent | bc68552faad0e134eb22281343d5ae5a4873fa80 (diff) | |
download | op-kernel-dev-cd04b947bc674f8fc9cac38ec30497bae5d664ad.zip op-kernel-dev-cd04b947bc674f8fc9cac38ec30497bae5d664ad.tar.gz |
Merge /spare/repo/linux-2.6/
Diffstat (limited to 'Documentation/arm/Samsung-S3C24XX/USB-Host.txt')
-rw-r--r-- | Documentation/arm/Samsung-S3C24XX/USB-Host.txt | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/Documentation/arm/Samsung-S3C24XX/USB-Host.txt b/Documentation/arm/Samsung-S3C24XX/USB-Host.txt new file mode 100644 index 0000000..b93b68e --- /dev/null +++ b/Documentation/arm/Samsung-S3C24XX/USB-Host.txt @@ -0,0 +1,93 @@ + 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 linux/include/asm-arm/arch-s3c2410/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, (c) 2005 Simtec Electronics |