projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ccf988b6 | 1 | ========================= |
| 1da177e4 | 2 | Kernel driver i2c-ali15x3 |
| ccf988b6 | 3 | ========================= |
| 1da177e4 LT |
4 | |
| 5 | Supported adapters: | |
| 6 | * Acer Labs, Inc. ALI 1533 and 1543C (south bridge) | |
| ccf988b6 | 7 | |
| 1da177e4 | 8 | Datasheet: Now under NDA |
| 0ea6e611 | 9 | http://www.ali.com.tw/ |
| 1da177e4 LT |
10 | |
| 11 | Authors: | |
| ccf988b6 MCC |
12 | - Frodo Looijaard <frodol@dds.nl>, |
| 13 | - Philip Edelbrock <phil@netroedge.com>, | |
| 14 | - Mark D. Studebaker <mdsxyz123@yahoo.com> | |
| 1da177e4 LT |
15 | |
| 16 | Module Parameters | |
| 17 | ----------------- | |
| 18 | ||
| 19 | * force_addr: int | |
| ccf988b6 | 20 | Initialize the base address of the i2c controller |
| 1da177e4 LT |
21 | |
| 22 | ||
| 23 | Notes | |
| 24 | ----- | |
| 25 | ||
| 26 | The force_addr parameter is useful for boards that don't set the address in | |
| 27 | the BIOS. Does not do a PCI force; the device must still be present in | |
| 28 | lspci. Don't use this unless the driver complains that the base address is | |
| 29 | not set. | |
| 30 | ||
| ccf988b6 MCC |
31 | Example:: |
| 32 | ||
| 33 | modprobe i2c-ali15x3 force_addr=0xe800 | |
| 1da177e4 LT |
34 | |
| 35 | SMBus periodically hangs on ASUS P5A motherboards and can only be cleared | |
| 36 | by a power cycle. Cause unknown (see Issues below). | |
| 37 | ||
| 38 | ||
| 39 | Description | |
| 40 | ----------- | |
| 41 | ||
| 42 | This is the driver for the SMB Host controller on Acer Labs Inc. (ALI) | |
| 43 | M1541 and M1543C South Bridges. | |
| 44 | ||
| 45 | The M1543C is a South bridge for desktop systems. | |
| ccf988b6 | 46 | |
| 1da177e4 | 47 | The M1541 is a South bridge for portable systems. |
| ccf988b6 | 48 | |
| 1da177e4 | 49 | They are part of the following ALI chipsets: |
| 89140f41 AG |
50 | |
| 51 | * "Aladdin Pro 2" includes the M1621 Slot 1 North bridge with AGP and | |
| ccf988b6 | 52 | 100MHz CPU Front Side bus |
| 89140f41 | 53 | * "Aladdin V" includes the M1541 Socket 7 North bridge with AGP and 100MHz |
| ccf988b6 MCC |
54 | CPU Front Side bus |
| 55 | ||
| 1da177e4 | 56 | Some Aladdin V motherboards: |
| ccf988b6 MCC |
57 | - Asus P5A |
| 58 | - Atrend ATC-5220 | |
| 59 | - BCM/GVC VP1541 | |
| 60 | - Biostar M5ALA | |
| 61 | - Gigabyte GA-5AX (Generally doesn't work because the BIOS doesn't | |
| 62 | enable the 7101 device!) | |
| 63 | - Iwill XA100 Plus | |
| 64 | - Micronics C200 | |
| 65 | - Microstar (MSI) MS-5169 | |
| 1da177e4 LT |
66 | |
| 67 | * "Aladdin IV" includes the M1541 Socket 7 North bridge | |
| ccf988b6 | 68 | with host bus up to 83.3 MHz. |
| 1da177e4 LT |
69 | |
| 70 | For an overview of these chips see http://www.acerlabs.com. At this time the | |
| 71 | full data sheets on the web site are password protected, however if you | |
| 72 | contact the ALI office in San Jose they may give you the password. | |
| 73 | ||
| 74 | The M1533/M1543C devices appear as FOUR separate devices on the PCI bus. An | |
| ccf988b6 | 75 | output of lspci will show something similar to the following:: |
| 1da177e4 LT |
76 | |
| 77 | 00:02.0 USB Controller: Acer Laboratories Inc. M5237 (rev 03) | |
| 78 | 00:03.0 Bridge: Acer Laboratories Inc. M7101 <= THIS IS THE ONE WE NEED | |
| 79 | 00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev c3) | |
| 80 | 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1) | |
| 81 | ||
| ccf988b6 MCC |
82 | .. important:: |
| 83 | ||
| 84 | If you have a M1533 or M1543C on the board and you get | |
| 85 | "ali15x3: Error: Can't detect ali15x3!" | |
| 86 | then run lspci. | |
| 87 | ||
| 88 | If you see the 1533 and 5229 devices but NOT the 7101 device, | |
| 89 | then you must enable ACPI, the PMU, SMB, or something similar | |
| 90 | in the BIOS. | |
| 91 | ||
| 92 | The driver won't work if it can't find the M7101 device. | |
| 1da177e4 LT |
93 | |
| 94 | The SMB controller is part of the M7101 device, which is an ACPI-compliant | |
| 95 | Power Management Unit (PMU). | |
| 96 | ||
| 97 | The whole M7101 device has to be enabled for the SMB to work. You can't | |
| 98 | just enable the SMB alone. The SMB and the ACPI have separate I/O spaces. | |
| 99 | We make sure that the SMB is enabled. We leave the ACPI alone. | |
| 100 | ||
| 89140f41 AG |
101 | Features |
| 102 | -------- | |
| 1da177e4 LT |
103 | |
| 104 | This driver controls the SMB Host only. The SMB Slave | |
| 105 | controller on the M15X3 is not enabled. This driver does not use | |
| 106 | interrupts. | |
| 107 | ||
| 108 | ||
| 109 | Issues | |
| 110 | ------ | |
| 111 | ||
| 112 | This driver requests the I/O space for only the SMB | |
| 113 | registers. It doesn't use the ACPI region. | |
| 114 | ||
| 115 | On the ASUS P5A motherboard, there are several reports that | |
| 116 | the SMBus will hang and this can only be resolved by | |
| 117 | powering off the computer. It appears to be worse when the board | |
| 118 | gets hot, for example under heavy CPU load, or in the summer. | |
| 119 | There may be electrical problems on this board. | |
| 120 | On the P5A, the W83781D sensor chip is on both the ISA and | |
| 121 | SMBus. Therefore the SMBus hangs can generally be avoided | |
| 122 | by accessing the W83781D on the ISA bus only. |