| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | Kernel driver i2c-ali15x3 |
| 2 | |
| 3 | Supported adapters: |
| 4 | * Acer Labs, Inc. ALI 1533 and 1543C (south bridge) |
| 5 | Datasheet: Now under NDA |
| 6 | http://www.ali.com.tw/eng/support/datasheet_request.php |
| 7 | |
| 8 | Authors: |
| 9 | Frodo Looijaard <frodol@dds.nl>, |
| 10 | Philip Edelbrock <phil@netroedge.com>, |
| 11 | Mark D. Studebaker <mdsxyz123@yahoo.com> |
| 12 | |
| 13 | Module Parameters |
| 14 | ----------------- |
| 15 | |
| 16 | * force_addr: int |
| 17 | Initialize the base address of the i2c controller |
| 18 | |
| 19 | |
| 20 | Notes |
| 21 | ----- |
| 22 | |
| 23 | The force_addr parameter is useful for boards that don't set the address in |
| 24 | the BIOS. Does not do a PCI force; the device must still be present in |
| 25 | lspci. Don't use this unless the driver complains that the base address is |
| 26 | not set. |
| 27 | |
| 28 | Example: 'modprobe i2c-ali15x3 force_addr=0xe800' |
| 29 | |
| 30 | SMBus periodically hangs on ASUS P5A motherboards and can only be cleared |
| 31 | by a power cycle. Cause unknown (see Issues below). |
| 32 | |
| 33 | |
| 34 | Description |
| 35 | ----------- |
| 36 | |
| 37 | This is the driver for the SMB Host controller on Acer Labs Inc. (ALI) |
| 38 | M1541 and M1543C South Bridges. |
| 39 | |
| 40 | The M1543C is a South bridge for desktop systems. |
| 41 | The M1541 is a South bridge for portable systems. |
| 42 | They are part of the following ALI chipsets: |
| 43 | |
| 44 | * "Aladdin Pro 2" includes the M1621 Slot 1 North bridge with AGP and |
| 45 | 100MHz CPU Front Side bus |
| 46 | * "Aladdin V" includes the M1541 Socket 7 North bridge with AGP and 100MHz |
| 47 | CPU Front Side bus |
| 48 | Some Aladdin V motherboards: |
| 49 | Asus P5A |
| 50 | Atrend ATC-5220 |
| 51 | BCM/GVC VP1541 |
| 52 | Biostar M5ALA |
| 53 | Gigabyte GA-5AX (** Generally doesn't work because the BIOS doesn't |
| 54 | enable the 7101 device! **) |
| 55 | Iwill XA100 Plus |
| 56 | Micronics C200 |
| 57 | Microstar (MSI) MS-5169 |
| 58 | |
| 59 | * "Aladdin IV" includes the M1541 Socket 7 North bridge |
| 60 | with host bus up to 83.3 MHz. |
| 61 | |
| 62 | For an overview of these chips see http://www.acerlabs.com. At this time the |
| 63 | full data sheets on the web site are password protected, however if you |
| 64 | contact the ALI office in San Jose they may give you the password. |
| 65 | |
| 66 | The M1533/M1543C devices appear as FOUR separate devices on the PCI bus. An |
| 67 | output of lspci will show something similar to the following: |
| 68 | |
| 69 | 00:02.0 USB Controller: Acer Laboratories Inc. M5237 (rev 03) |
| 70 | 00:03.0 Bridge: Acer Laboratories Inc. M7101 <= THIS IS THE ONE WE NEED |
| 71 | 00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev c3) |
| 72 | 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1) |
| 73 | |
| 74 | ** IMPORTANT ** |
| 75 | ** If you have a M1533 or M1543C on the board and you get |
| 76 | ** "ali15x3: Error: Can't detect ali15x3!" |
| 77 | ** then run lspci. |
| 78 | ** If you see the 1533 and 5229 devices but NOT the 7101 device, |
| 79 | ** then you must enable ACPI, the PMU, SMB, or something similar |
| 80 | ** in the BIOS. |
| 81 | ** The driver won't work if it can't find the M7101 device. |
| 82 | |
| 83 | The SMB controller is part of the M7101 device, which is an ACPI-compliant |
| 84 | Power Management Unit (PMU). |
| 85 | |
| 86 | The whole M7101 device has to be enabled for the SMB to work. You can't |
| 87 | just enable the SMB alone. The SMB and the ACPI have separate I/O spaces. |
| 88 | We make sure that the SMB is enabled. We leave the ACPI alone. |
| 89 | |
| 90 | Features |
| 91 | -------- |
| 92 | |
| 93 | This driver controls the SMB Host only. The SMB Slave |
| 94 | controller on the M15X3 is not enabled. This driver does not use |
| 95 | interrupts. |
| 96 | |
| 97 | |
| 98 | Issues |
| 99 | ------ |
| 100 | |
| 101 | This driver requests the I/O space for only the SMB |
| 102 | registers. It doesn't use the ACPI region. |
| 103 | |
| 104 | On the ASUS P5A motherboard, there are several reports that |
| 105 | the SMBus will hang and this can only be resolved by |
| 106 | powering off the computer. It appears to be worse when the board |
| 107 | gets hot, for example under heavy CPU load, or in the summer. |
| 108 | There may be electrical problems on this board. |
| 109 | On the P5A, the W83781D sensor chip is on both the ISA and |
| 110 | SMBus. Therefore the SMBus hangs can generally be avoided |
| 111 | by accessing the W83781D on the ISA bus only. |
| 112 | |