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- =========================
- 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 <[email protected]>,
- - Philip Edelbrock <[email protected]>,
- - Mark D. Studebaker <[email protected]>
- 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.
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