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Notes on the the generic USB-OHCI driver |
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======================================== |
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This driver (drivers/usb_ohci.[ch]) is the result of the merge of |
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various existing OHCI drivers that were basically identical beside |
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cpu/board dependant initalization. This initalization has been moved |
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into cpu/board directories and are called via the hooks below. |
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Configuration options |
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---------------------- |
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CONFIG_USB_OHCI_NEW: enable the new OHCI driver |
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CFG_USB_OHCI_BOARD_INIT: call the board dependant hooks: |
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- extern int usb_board_init(void); |
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- extern int usb_board_stop(void); |
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- extern int usb_cpu_init_fail(void); |
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CFG_USB_OHCI_CPU_INIT: call the cpu dependant hooks: |
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- extern int usb_cpu_init(void); |
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- extern int usb_cpu_stop(void); |
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- extern int usb_cpu_init_fail(void); |
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CFG_USB_OHCI_REGS_BASE: defines the base address of the OHCI registers |
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CFG_USB_OHCI_SLOT_NAME: slot name |
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CFG_USB_OHCI_MAX_ROOT_PORTS: maximal number of ports of the root hub. |
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Endianness issues |
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------------------ |
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The LITTLEENDIAN #define determines if the 'swap_16' and 'swap_32' |
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macros do byte swapping or not. But some cpus OHCI-controllers such as |
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ppc4xx and mpc5xxx operate in little endian mode, so some extra ifdefs |
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were necessary to make this work. |
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