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60 lines
1.4 KiB
Text
60 lines
1.4 KiB
Text
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
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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
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root hub.
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Endianness issues
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------------------
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The USB bus operates in little endian, but unfortunately there are
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OHCI controllers that operate in big endian such as ppc4xx and
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mpc5xxx. For these the config option
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CFG_OHCI_BE_CONTROLLER
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needs to be defined.
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PCI Controllers
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----------------
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You'll need to define
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CONFIG_PCI_OHCI
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PCI Controllers need to do byte swapping on register accesses, so they
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should to define:
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CFG_OHCI_SWAP_REG_ACCESS
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