| ========================= |
| 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. |
