projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 58b48577 MK |
1 | Notes on the the generic USB-OHCI driver |
| 2 | ======================================== | |
| 3 | ||
| 7817cb20 | 4 | This driver (drivers/usb/usb_ohci.[ch]) is the result of the merge of |
| 58b48577 MK |
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 | ||
| fc43be47 | 12 | CONFIG_USB_OHCI_NEW: enable the new OHCI driver |
| 58b48577 | 13 | |
| 6d0f6bcf | 14 | CONFIG_SYS_USB_OHCI_BOARD_INIT: call the board dependant hooks: |
| 58b48577 | 15 | |
| 2a766db1 | 16 | - extern int board_usb_init(void); |
| fc43be47 MK |
17 | - extern int usb_board_stop(void); |
| 18 | - extern int usb_cpu_init_fail(void); | |
| 58b48577 | 19 | |
| 6d0f6bcf | 20 | CONFIG_SYS_USB_OHCI_CPU_INIT: call the cpu dependant hooks: |
| 58b48577 | 21 | |
| fc43be47 MK |
22 | - extern int usb_cpu_init(void); |
| 23 | - extern int usb_cpu_stop(void); | |
| 24 | - extern int usb_cpu_init_fail(void); | |
| 58b48577 | 25 | |
| 6d0f6bcf | 26 | CONFIG_SYS_USB_OHCI_REGS_BASE: defines the base address of the OHCI |
| fc43be47 | 27 | registers |
| 58b48577 | 28 | |
| 6d0f6bcf | 29 | CONFIG_SYS_USB_OHCI_SLOT_NAME: slot name |
| 58b48577 | 30 | |
| 6d0f6bcf | 31 | CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS: maximal number of ports of the |
| fc43be47 | 32 | root hub. |
| 58b48577 MK |
33 | |
| 34 | ||
| 35 | Endianness issues | |
| 36 | ------------------ | |
| 37 | ||
| fc43be47 | 38 | The USB bus operates in little endian, but unfortunately there are |
| 064b55cf HS |
39 | OHCI controllers that operate in big endian such as ppc4xx. For these the |
| 40 | config option | |
| 58b48577 | 41 | |
| 6d0f6bcf | 42 | CONFIG_SYS_OHCI_BE_CONTROLLER |
| fc43be47 | 43 | |
| be5d72d1 | 44 | needs to be defined. |
| fc43be47 MK |
45 | |
| 46 | ||
| 47 | PCI Controllers | |
| 48 | ---------------- | |
| 49 | ||
| 50 | You'll need to define | |
| 51 | ||
| 52 | CONFIG_PCI_OHCI | |
| 53 | ||
| 5a904e56 SP |
54 | If you have several USB PCI controllers, define |
| 55 | ||
| 56 | CONFIG_PCI_OHCI_DEVNO: number of the OHCI device in PCI list | |
| 57 | ||
| 58 | If undefined, the first instance found in PCI space will be used. | |
| 59 | ||
| fc43be47 MK |
60 | PCI Controllers need to do byte swapping on register accesses, so they |
| 61 | should to define: | |
| 62 | ||
| 6d0f6bcf | 63 | CONFIG_SYS_OHCI_SWAP_REG_ACCESS |