1 ========================= 1 =========================
2 Kernel driver i2c-ali15x3 2 Kernel driver i2c-ali15x3
3 ========================= 3 =========================
4 4
5 Supported adapters: 5 Supported adapters:
6 * Acer Labs, Inc. ALI 1533 and 1543C (south 6 * Acer Labs, Inc. ALI 1533 and 1543C (south bridge)
7 7
8 Datasheet: Now under NDA 8 Datasheet: Now under NDA
9 http://www.ali.com.tw/ 9 http://www.ali.com.tw/
10 10
11 Authors: 11 Authors:
12 - Frodo Looijaard <frodol@dds.nl>, 12 - Frodo Looijaard <frodol@dds.nl>,
13 - Philip Edelbrock <phil@netroedge.com> 13 - Philip Edelbrock <phil@netroedge.com>,
14 - Mark D. Studebaker <mdsxyz123@yahoo.c 14 - Mark D. Studebaker <mdsxyz123@yahoo.com>
15 15
16 Module Parameters 16 Module Parameters
17 ----------------- 17 -----------------
18 18
19 * force_addr: int 19 * force_addr: int
20 Initialize the base address of the i2c con 20 Initialize the base address of the i2c controller
21 21
22 22
23 Notes 23 Notes
24 ----- 24 -----
25 25
26 The force_addr parameter is useful for boards 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 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 compla 28 lspci. Don't use this unless the driver complains that the base address is
29 not set. 29 not set.
30 30
31 Example:: 31 Example::
32 32
33 modprobe i2c-ali15x3 force_addr=0xe800 33 modprobe i2c-ali15x3 force_addr=0xe800
34 34
35 SMBus periodically hangs on ASUS P5A motherboa 35 SMBus periodically hangs on ASUS P5A motherboards and can only be cleared
36 by a power cycle. Cause unknown (see Issues be 36 by a power cycle. Cause unknown (see Issues below).
37 37
38 38
39 Description 39 Description
40 ----------- 40 -----------
41 41
42 This is the driver for the SMB Host controller 42 This is the driver for the SMB Host controller on Acer Labs Inc. (ALI)
43 M1541 and M1543C South Bridges. 43 M1541 and M1543C South Bridges.
44 44
45 The M1543C is a South bridge for desktop syste 45 The M1543C is a South bridge for desktop systems.
46 46
47 The M1541 is a South bridge for portable syste 47 The M1541 is a South bridge for portable systems.
48 48
49 They are part of the following ALI chipsets: 49 They are part of the following ALI chipsets:
50 50
51 * "Aladdin Pro 2" includes the M1621 Slot 1 N 51 * "Aladdin Pro 2" includes the M1621 Slot 1 North bridge with AGP and
52 100MHz CPU Front Side bus 52 100MHz CPU Front Side bus
53 * "Aladdin V" includes the M1541 Socket 7 Nor 53 * "Aladdin V" includes the M1541 Socket 7 North bridge with AGP and 100MHz
54 CPU Front Side bus 54 CPU Front Side bus
55 55
56 Some Aladdin V motherboards: 56 Some Aladdin V motherboards:
57 - Asus P5A 57 - Asus P5A
58 - Atrend ATC-5220 58 - Atrend ATC-5220
59 - BCM/GVC VP1541 59 - BCM/GVC VP1541
60 - Biostar M5ALA 60 - Biostar M5ALA
61 - Gigabyte GA-5AX (Generally doesn't w 61 - Gigabyte GA-5AX (Generally doesn't work because the BIOS doesn't
62 enable the 7101 device!) 62 enable the 7101 device!)
63 - Iwill XA100 Plus 63 - Iwill XA100 Plus
64 - Micronics C200 64 - Micronics C200
65 - Microstar (MSI) MS-5169 65 - Microstar (MSI) MS-5169
66 66
67 * "Aladdin IV" includes the M1541 Socket 7 N 67 * "Aladdin IV" includes the M1541 Socket 7 North bridge
68 with host bus up to 83.3 MHz. 68 with host bus up to 83.3 MHz.
69 69
70 For an overview of these chips see http://www. 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 71 full data sheets on the web site are password protected, however if you
72 contact the ALI office in San Jose they may gi 72 contact the ALI office in San Jose they may give you the password.
73 73
74 The M1533/M1543C devices appear as FOUR separa 74 The M1533/M1543C devices appear as FOUR separate devices on the PCI bus. An
75 output of lspci will show something similar to 75 output of lspci will show something similar to the following::
76 76
77 00:02.0 USB Controller: Acer Laboratories In 77 00:02.0 USB Controller: Acer Laboratories Inc. M5237 (rev 03)
78 00:03.0 Bridge: Acer Laboratories Inc. M7101 78 00:03.0 Bridge: Acer Laboratories Inc. M7101 <= THIS IS THE ONE WE NEED
79 00:07.0 ISA bridge: Acer Laboratories Inc. M 79 00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev c3)
80 00:0f.0 IDE interface: Acer Laboratories Inc 80 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1)
81 81
82 .. important:: 82 .. important::
83 83
84 If you have a M1533 or M1543C on the board 84 If you have a M1533 or M1543C on the board and you get
85 "ali15x3: Error: Can't detect ali15x3!" 85 "ali15x3: Error: Can't detect ali15x3!"
86 then run lspci. 86 then run lspci.
87 87
88 If you see the 1533 and 5229 devices but NO 88 If you see the 1533 and 5229 devices but NOT the 7101 device,
89 then you must enable ACPI, the PMU, SMB, or 89 then you must enable ACPI, the PMU, SMB, or something similar
90 in the BIOS. 90 in the BIOS.
91 91
92 The driver won't work if it can't find the 92 The driver won't work if it can't find the M7101 device.
93 93
94 The SMB controller is part of the M7101 device 94 The SMB controller is part of the M7101 device, which is an ACPI-compliant
95 Power Management Unit (PMU). 95 Power Management Unit (PMU).
96 96
97 The whole M7101 device has to be enabled for t 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 ACP 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 99 We make sure that the SMB is enabled. We leave the ACPI alone.
100 100
101 Features 101 Features
102 -------- 102 --------
103 103
104 This driver controls the SMB Host only. The SM 104 This driver controls the SMB Host only. The SMB Slave
105 controller on the M15X3 is not enabled. This d 105 controller on the M15X3 is not enabled. This driver does not use
106 interrupts. 106 interrupts.
107 107
108 108
109 Issues 109 Issues
110 ------ 110 ------
111 111
112 This driver requests the I/O space for only th 112 This driver requests the I/O space for only the SMB
113 registers. It doesn't use the ACPI region. 113 registers. It doesn't use the ACPI region.
114 114
115 On the ASUS P5A motherboard, there are several 115 On the ASUS P5A motherboard, there are several reports that
116 the SMBus will hang and this can only be resol 116 the SMBus will hang and this can only be resolved by
117 powering off the computer. It appears to be wo 117 powering off the computer. It appears to be worse when the board
118 gets hot, for example under heavy CPU load, or 118 gets hot, for example under heavy CPU load, or in the summer.
119 There may be electrical problems on this board 119 There may be electrical problems on this board.
120 On the P5A, the W83781D sensor chip is on both 120 On the P5A, the W83781D sensor chip is on both the ISA and
121 SMBus. Therefore the SMBus hangs can generally 121 SMBus. Therefore the SMBus hangs can generally be avoided
122 by accessing the W83781D on the ISA bus only. 122 by accessing the W83781D on the ISA bus only.
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