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https://github.com/brain-hackers/u-boot-brain
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064b55cfcb
There was for long time no activity in the mpx5xxx area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in mpc5xxx, so remove it. Signed-off-by: Heiko Schocher <hs@denx.de>
64 lines
1.6 KiB
Plaintext
64 lines
1.6 KiB
Plaintext
Notes on the the generic USB-OHCI driver
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========================================
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This driver (drivers/usb/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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CONFIG_SYS_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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CONFIG_SYS_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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CONFIG_SYS_USB_OHCI_REGS_BASE: defines the base address of the OHCI
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registers
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CONFIG_SYS_USB_OHCI_SLOT_NAME: slot name
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CONFIG_SYS_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. For these the
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config option
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CONFIG_SYS_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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If you have several USB PCI controllers, define
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CONFIG_PCI_OHCI_DEVNO: number of the OHCI device in PCI list
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If undefined, the first instance found in PCI space will be used.
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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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CONFIG_SYS_OHCI_SWAP_REG_ACCESS
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