mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2025-01-17 15:27:36 +00:00
Code Issues Releases Activity

The linux driver code for the MDIO bus does a read-after-write

Browse Source 
which seems to be required on MIPS74k platforms for correct
behaviour.

Reviewed by:	adrian
This commit is contained in:
Sean Bruno 2015-02-02 17:33:00 +00:00
parent 609752f04f
commit cb53a7b39e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=278104
1 changed files with 14 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
sys/mips/atheros/if_argevar.h
View File

@ -74,8 +74,20 @@
#define ARGE_CLEAR_BITS(sc, reg, bits) \
ARGE_WRITE(sc, reg, ARGE_READ(sc, (reg)) & ~(bits))
#define ARGE_MDIO_WRITE(_sc, _reg, _val) \
ARGE_WRITE((_sc), (_reg), (_val))
/*
* The linux driver code for the MDIO bus does a read-after-write
* which seems to be required on MIPS74k platforms for correct
* behaviour.
*
* So, ARGE_WRITE() does the write + barrier, and the following
* ARGE_READ() seems to flush the thing all the way through the device
* FIFO(s) before we continue issuing MDIO bus updates.
*/
#define ARGE_MDIO_WRITE(_sc, _reg, _val) \
do { \
ARGE_WRITE((_sc), (_reg), (_val)); \
ARGE_READ((_sc), (_reg)); \
} while (0)
#define ARGE_MDIO_READ(_sc, _reg) \
ARGE_READ((_sc), (_reg))
#define ARGE_MDIO_BARRIER_READ(_sc) ARGE_BARRIER_READ(_sc)