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S3C24XX USB Host support | ||
======================== | ||
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Introduction | ||
------------ | ||
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This document details the S3C2410/S3C2440 in-built OHCI USB host support. | ||
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Configuration | ||
------------- | ||
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Enable at least the following kernel options: | ||
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menuconfig: | ||
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Device Drivers ---> | ||
USB support ---> | ||
<*> Support for Host-side USB | ||
<*> OHCI HCD support | ||
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.config: | ||
CONFIG_USB | ||
CONFIG_USB_OHCI_HCD | ||
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Once these options are configured, the standard set of USB device | ||
drivers can be configured and used. | ||
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Board Support | ||
------------- | ||
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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 | ||
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The platform device's platform_data field is only needed if the | ||
board implements extra power control or over-current monitoring. | ||
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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. | ||
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Platform Data | ||
------------- | ||
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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 . | ||
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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. | ||
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The ports are numbered 0 and 1. | ||
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power_control: | ||
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Called to enable or disable the power on the port. | ||
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enable_oc: | ||
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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. | ||
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report_oc: | ||
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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. | ||
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The function s3c2410_usb_report_oc() has been provided to | ||
ensure this is called correctly. | ||
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port[x]: | ||
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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. | ||
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Document Author | ||
--------------- | ||
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Ben Dooks, (c) 2005 Simtec Electronics |
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@@ -104,6 +104,7 @@ logo_*.c | |
logo_*_clut224.c | ||
logo_*_mono.c | ||
lxdialog | ||
mach-types | ||
mach-types.h | ||
make_times_h | ||
map | ||
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