[coreboot] Dump GPIO I/O Registers

[joe at smittys.pointclark.net]

Quoting Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>:

> On 18.02.2008 02:45, joe at smittys.pointclark.net wrote:
>> Quoting Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006 at gmx.net>:
>>
>>> On 16.02.2008 17:57, joe at smittys.pointclark.net wrote:
>>>
>>>> Hello,
>>>> How do I dump the GPIO I/O Registers in linux. I need to dump the  
>>>>     GPIO's from the southbridge. Anyone?
>>>>
>>>>
>>> Depends on the southbridge. It could be directly/indirectly
>>> memory-mapped or port-based. Simply tell us what the data sheet says
>>> about reading the GPIO state and we can help.
>>>
>>>
>> The southbridge is the Intel 82801DB ICH4. I don't see anything in   
>> the datasheet about reading the GPIO state....just says:
>>
>> The control for the general purpose I/O signals is handled through   
>> a  separate 64-byte I/O space.
>>
>> I can find out the base offset address from the LPC pci   
>> configuration  registers, but how do I dump it into human readable   
>> form??
>>
>
> Is this a memory address or I/O port number? Once you know that, you
> can modify existing utilities for your purpose. If you have no idea,
> tell us the values and we can guess. Having /proc/ioports and
> /proc/iomem contents would help guessing.
>
Here is /proc/ioports:
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-006f : keyboard
0070-0077 : rtc
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
0376-0376 : ide1
03c0-03df : vga+
03f8-03ff : serial
0400-047f : 0000:00:1f.0
   0400-0403 : ACPI PM1a_EVT_BLK
   0404-0405 : ACPI PM1a_CNT_BLK
   0408-040b : ACPI PM_TMR
   0410-0415 : ACPI CPU throttle
   0420-0420 : ACPI PM2_CNT_BLK
   0428-042f : ACPI GPE0_BLK
   0460-047f : iTCO_wdt
0500-053f : 0000:00:1f.0
0a00-0a3f : pnp 00:0b
0cf8-0cff : PCI conf1
c000-cfff : PCI Bus #01
   cc00-cc3f : 0000:01:08.0
     cc00-cc3f : e100
d800-d81f : 0000:00:1d.0
   d800-d81f : uhci_hcd
d880-d89f : 0000:00:1d.1
   d880-d89f : uhci_hcd
dc00-dc1f : 0000:00:1d.2
   dc00-dc1f : uhci_hcd
e000-e01f : 0000:00:1f.3
   e000-e01f : i801_smbus
e080-e0bf : 0000:00:1f.5
   e080-e0bf : Intel 82801DB-ICH4
e400-e4ff : 0000:00:1f.5
   e400-e4ff : Intel 82801DB-ICH4
e800-e8ff : 0000:00:1f.6
ec00-ec7f : 0000:00:1f.6
ffa0-ffaf : 0000:00:1f.1
   ffa0-ffa7 : ide0
   ffa8-ffaf : ide1

Here is /proc/iomem:
00000000-0009fbff : System RAM
   00000000-00000000 : Crash kernel
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-077cffff : System RAM
   00400000-006200ec : Kernel code
   006200ed-00736543 : Kernel data
077d0000-077defff : ACPI Tables
077df000-077fffff : ACPI Non-volatile Storage
10000000-100003ff : 0000:00:1f.1
e8000000-efffffff : 0000:00:02.1
f0000000-f7ffffff : 0000:00:02.0
ff700000-ff7fffff : PCI Bus #01
   ff7ff000-ff7fffff : 0000:01:08.0
     ff7ff000-ff7fffff : e100
ff980000-ff9fffff : 0000:00:02.1
ffa7f400-ffa7f7ff : 0000:00:1d.7
   ffa7f400-ffa7f7ff : ehci_hcd
ffa7f800-ffa7f8ff : 0000:00:1f.5
   ffa7f800-ffa7f8ff : Intel 82801DB-ICH4
ffa7fc00-ffa7fdff : 0000:00:1f.5
   ffa7fc00-ffa7fdff : Intel 82801DB-ICH4
ffa80000-ffafffff : 0000:00:02.0
ffc00000-fff7ffff : pnp 00:08

According to the original bios I think the 64 bytes of I/O space for  
GPIO is 0x14. Does that make sense???

Thanks - Joe