| Markus Klotzbuecher | 58b4857 | 2006-11-27 11:51:21 +0100 | [diff] [blame] | 1 | Notes on the the generic USB-OHCI driver |
| 2 | ======================================== |
| 3 | |
| 4 | This driver (drivers/usb_ohci.[ch]) is the result of the merge of |
| 5 | various existing OHCI drivers that were basically identical beside |
| 6 | cpu/board dependant initalization. This initalization has been moved |
| 7 | into cpu/board directories and are called via the hooks below. |
| 8 | |
| 9 | Configuration options |
| 10 | ---------------------- |
| 11 | |
| 12 | CONFIG_USB_OHCI_NEW: enable the new OHCI driver |
| 13 | |
| 14 | CFG_USB_OHCI_BOARD_INIT: call the board dependant hooks: |
| 15 | |
| 16 | - extern int usb_board_init(void); |
| 17 | - extern int usb_board_stop(void); |
| 18 | - extern int usb_cpu_init_fail(void); |
| 19 | |
| 20 | CFG_USB_OHCI_CPU_INIT: call the cpu dependant hooks: |
| 21 | |
| 22 | - extern int usb_cpu_init(void); |
| 23 | - extern int usb_cpu_stop(void); |
| 24 | - extern int usb_cpu_init_fail(void); |
| 25 | |
| 26 | CFG_USB_OHCI_REGS_BASE: defines the base address of the OHCI registers |
| 27 | |
| 28 | CFG_USB_OHCI_SLOT_NAME: slot name |
| 29 | |
| 30 | CFG_USB_OHCI_MAX_ROOT_PORTS: maximal number of ports of the root hub. |
| 31 | |
| 32 | |
| 33 | Endianness issues |
| 34 | ------------------ |
| 35 | |
| 36 | The LITTLEENDIAN #define determines if the 'swap_16' and 'swap_32' |
| 37 | macros do byte swapping or not. But some cpus OHCI-controllers such as |
| 38 | ppc4xx and mpc5xxx operate in little endian mode, so some extra ifdefs |
| 39 | were necessary to make this work. |
| 40 | |
| 41 | |
| 42 | |
| 43 | |