topic I2C control by MMIO in Embedded Intel® Core™ Processors

I2C control by MMIO

AmyChen — Thu, 18 Apr 2024 08:21:36 GMT

Hello,

I'm using I2C with ADL-S to control the device. Currently, I'm familiar with using SMBus for control. For instance, if I want to control a device at address 0x40 and write FF to register location 0x12, I would perform the following steps in the SMBus registers:

IO space+00 = FE (clearing the register)
IO space+04 = 40 (device address)
IO space+03 = 12 (register address to write to)
IO space+05 = FF (data to write)
IO space+02 = 48 (write method: byte write)

By following these steps, I can achieve the write operation.

If I want to switch to I2C via MMIO, I've found the base address (memory address).

But what are the corresponding registers, values or steps?
Can you give me a simple example?
Or do you have relevant information to provide me?

Thank you.

Re: I2C control by MMIO

CarlosAM_INTEL — Thu, 18 Apr 2024 14:48:17 GMT

Hello, @AmyChen:

Thank you for contacting Intel Embedded Community.

We sent an email to the address related to this account with information that may help you to solve this situation.

Best regards,

@CarlosAM_INTEL.

Re: I2C control by MMIO

EdwinJr — Fri, 16 Aug 2024 03:50:02 GMT

Sorry to bother you.

I also have the same problem, could you please send me the information on how to solve this situation too?

Thank you for your time.

Re: I2C control by MMIO

Diego_INTEL — Sat, 17 Aug 2024 01:55:06 GMT

Hello @EdwinJr,

Thank you for contacting Intel Embedded Community.

I think the email refers to make the consultation using Premier Support.

https://www.intel.com/content/www/us/en/support/articles/000057045/ethernet-products.html

You may check:

Document #621483 - PCH EDS Vol 2 for Alder Lake S on section "13 - I2C Interface (D21:F0-F3, D25:F0-F1"

Document #619362 - PCH EDS Vol 1 for Alder Lake S on section "18.0 Intel® Serial I/O Inter-Integrated Circuit (I2C) Controllers"

As a guide or examples I have not found any in our resources unfortunately.

Best regards,

@Diego_INTEL