I have not seen any (except generic chipset description) documents in public
(only references to them in the driver); most of information was retrieved
by reading vendor driver code / experimenting with devices.

Thank you! That is in the Linux driver here:
http://src.illumos.org/source/xref/linux-master/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/phy.c#_rtl8188e_config_rf_reg

As a matter of completion, is this information publicly available such
as in a chipset document or something you came across from reading the
driver code? I am currently essentially doing replay without fully
understanding how the device works.

On 10/01/2017 03:12 PM, Andriy Voskoboinyk wrote:
Do you mean 0xFFE address? In vendor driver such 'addresses' are used
for delay between writes (50 ms for RTL8812A).

The issue is in the assignment, not the write/read part. rtwn_rf_prog
wants a * uint8_t list, whereas the register size from Linux is a
uint32_t (but can cleanly fit into a uint16_t and might just be the
default register size on Linux). How do I reconcile those two? I hope I
was clearer there.

The first column are the Linux registers in question:
http://src.illumos.org/source/xref/linux-master/drivers/net/wireless/realtek/rtlwifi/rtl8188ee/table.c#316


Thank you for your continued assistance.

On 10/01/2017 06:30 AM, Andriy Voskoboinyk wrote:
Hi,

RF registers are using indirect addressing; you should use
rtwn_rf_write() / rtwn_rf_read() instead.


I am working on porting over a Linux Realtek driver to FreeBSD. I ran
into a register-size issue.

FreeBSD's PCI-write function is defined as follows:
rtwn_pci_write_4(struct rtwn_softc *sc, uint16_t addr)

Notice that the second parameter is of type uint16_t.

During initialization, the rtwn driver uses the rtwn_rf_prog structure to write a pre-defined list of data to a pre-defined list of registers.
The structure to hold both lists is defined here:
http://src.illumos.org/source/xref/freebsd-head/sys/dev/rtwn/if_rtwnreg.h#150.


Notice how the second parameter 'reg' is a uint8_t.

The rtwn_pci_write_4's addr is uint16_t, the rtwn_rf_prog's addr is a
uint8_t. How would I reconcile this type mismatch? Additionally, the
Linux version of this block of code has all register values as a
uint32_t. It is not a matter of a cast, because some values definitely
use more than 1 byte (ie 0xFFE).

Suggestions on how to reconcile and resolve this issue?

Thanks!
Farhan Khan
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