| Kernel driver i2c-ali15x3 | |
| Supported adapters: | |
| * Acer Labs, Inc. ALI 1533 and 1543C (south bridge) | |
| Datasheet: Now under NDA | |
| http://www.ali.com.tw/ | |
| Authors: | |
| Frodo Looijaard <frodol@dds.nl>, | |
| Philip Edelbrock <phil@netroedge.com>, | |
| Mark D. Studebaker <mdsxyz123@yahoo.com> | |
| Module Parameters | |
| ----------------- | |
| * force_addr: int | |
| Initialize the base address of the i2c controller | |
| Notes | |
| ----- | |
| The force_addr parameter is useful for boards that don't set the address in | |
| the BIOS. Does not do a PCI force; the device must still be present in | |
| lspci. Don't use this unless the driver complains that the base address is | |
| not set. | |
| Example: 'modprobe i2c-ali15x3 force_addr=0xe800' | |
| SMBus periodically hangs on ASUS P5A motherboards and can only be cleared | |
| by a power cycle. Cause unknown (see Issues below). | |
| Description | |
| ----------- | |
| This is the driver for the SMB Host controller on Acer Labs Inc. (ALI) | |
| M1541 and M1543C South Bridges. | |
| The M1543C is a South bridge for desktop systems. | |
| The M1541 is a South bridge for portable systems. | |
| They are part of the following ALI chipsets: | |
| * "Aladdin Pro 2" includes the M1621 Slot 1 North bridge with AGP and | |
| 100MHz CPU Front Side bus | |
| * "Aladdin V" includes the M1541 Socket 7 North bridge with AGP and 100MHz | |
| CPU Front Side bus | |
| Some Aladdin V motherboards: | |
| Asus P5A | |
| Atrend ATC-5220 | |
| BCM/GVC VP1541 | |
| Biostar M5ALA | |
| Gigabyte GA-5AX (** Generally doesn't work because the BIOS doesn't | |
| enable the 7101 device! **) | |
| Iwill XA100 Plus | |
| Micronics C200 | |
| Microstar (MSI) MS-5169 | |
| * "Aladdin IV" includes the M1541 Socket 7 North bridge | |
| with host bus up to 83.3 MHz. | |
| For an overview of these chips see http://www.acerlabs.com. At this time the | |
| full data sheets on the web site are password protected, however if you | |
| contact the ALI office in San Jose they may give you the password. | |
| The M1533/M1543C devices appear as FOUR separate devices on the PCI bus. An | |
| output of lspci will show something similar to the following: | |
| 00:02.0 USB Controller: Acer Laboratories Inc. M5237 (rev 03) | |
| 00:03.0 Bridge: Acer Laboratories Inc. M7101 <= THIS IS THE ONE WE NEED | |
| 00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev c3) | |
| 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1) | |
| ** IMPORTANT ** | |
| ** If you have a M1533 or M1543C on the board and you get | |
| ** "ali15x3: Error: Can't detect ali15x3!" | |
| ** then run lspci. | |
| ** If you see the 1533 and 5229 devices but NOT the 7101 device, | |
| ** then you must enable ACPI, the PMU, SMB, or something similar | |
| ** in the BIOS. | |
| ** The driver won't work if it can't find the M7101 device. | |
| The SMB controller is part of the M7101 device, which is an ACPI-compliant | |
| Power Management Unit (PMU). | |
| The whole M7101 device has to be enabled for the SMB to work. You can't | |
| just enable the SMB alone. The SMB and the ACPI have separate I/O spaces. | |
| We make sure that the SMB is enabled. We leave the ACPI alone. | |
| Features | |
| -------- | |
| This driver controls the SMB Host only. The SMB Slave | |
| controller on the M15X3 is not enabled. This driver does not use | |
| interrupts. | |
| Issues | |
| ------ | |
| This driver requests the I/O space for only the SMB | |
| registers. It doesn't use the ACPI region. | |
| On the ASUS P5A motherboard, there are several reports that | |
| the SMBus will hang and this can only be resolved by | |
| powering off the computer. It appears to be worse when the board | |
| gets hot, for example under heavy CPU load, or in the summer. | |
| There may be electrical problems on this board. | |
| On the P5A, the W83781D sensor chip is on both the ISA and | |
| SMBus. Therefore the SMBus hangs can generally be avoided | |
| by accessing the W83781D on the ISA bus only. | |