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doc/README.generic_usb_ohci 1.62 KB
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d41ce506b   Eric Lee   Initial Release, ... 
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  Notes on the the generic USB-OHCI driver
  ========================================
  
  This driver (drivers/usb/usb_ohci.[ch]) is the result of the merge of
  various existing OHCI drivers that were basically identical beside
  cpu/board dependant initalization. This initalization has been moved
  into cpu/board directories and are called via the hooks below.
  
  Configuration options
  ----------------------
  
  	CONFIG_USB_OHCI_NEW: enable the new OHCI driver
  
  	CONFIG_SYS_USB_OHCI_BOARD_INIT: call the board dependant hooks:
  
  		  - extern int usb_board_init(void);
  		  - extern int usb_board_stop(void);
  		  - extern int usb_cpu_init_fail(void);
  
  	CONFIG_SYS_USB_OHCI_CPU_INIT: call the cpu dependant hooks:
  
  		  - extern int usb_cpu_init(void);
  		  - extern int usb_cpu_stop(void);
  		  - extern int usb_cpu_init_fail(void);
  
  	CONFIG_SYS_USB_OHCI_REGS_BASE: defines the base address of the OHCI
  				registers
  
  	CONFIG_SYS_USB_OHCI_SLOT_NAME: slot name
  
  	CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS: maximal number of ports of the
  				     root hub.
  
  
  Endianness issues
  ------------------
  
  The USB bus operates in little endian, but unfortunately there are
  OHCI controllers that operate in big endian such as ppc4xx. For these the
  config option
  
  	CONFIG_SYS_OHCI_BE_CONTROLLER
  
  needs to be defined.
  
  
  PCI Controllers
  ----------------
  
  You'll need to define
  
  	CONFIG_PCI_OHCI
  
  If you have several USB PCI controllers, define
  
  	CONFIG_PCI_OHCI_DEVNO: number of the OHCI device in PCI list
  
  If undefined, the first instance found in PCI space will be used.
  
  PCI Controllers need to do byte swapping on register accesses, so they
  should to define:
  
  	CONFIG_SYS_OHCI_SWAP_REG_ACCESS