d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Implement workaround for Armada 38X family HW issue between CPU and devices

Browse Source 
There is a hardware problem between Cortex-A9 CPUs and on-chip devices
in Armada 38X SoCs that may cause hang on heavy load. This can be
however worked around by mapping all registers and PCI IO
as strongly ordered instead of device memory.

Submitted by: Zbigniew Bodek <zbb@semihalf.com>
Reviewed by: mmel
Tested by: mw_semihalf.com
Obtained from: Semihalf
Differential revision: https://reviews.freebsd.org/D10218
This commit is contained in:
Zbigniew Bodek 2017-06-20 11:09:38 +00:00
parent 98b9d3847d
commit b50f666958
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320141
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sys/arm/mv/mv_machdep.c
View File

@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$");
#include <machine/cpu-v4.h>
#else
#include <machine/cpu-v6.h>
#include <machine/pte-v6.h>
#endif
#include <arm/mv/mvreg.h> /* XXX */
@ -257,6 +258,15 @@ platform_late_init(void)
#endif
#if defined(SOC_MV_ARMADA38X)
/*
* Workaround for Marvell Armada38X family HW issue
* between Cortex-A9 CPUs and on-chip devices that may
* cause hang on heavy load.
* To avoid that, map all registers including PCIe IO
* as strongly ordered instead of device memory.
*/
pmap_remap_vm_attr(PTE2_ATTR_DEVICE, PTE2_ATTR_SO);
/* Set IO Sync Barrier bit for all Mbus devices */
if (armada38x_win_set_iosync_barrier() != 0)
printf("WARNING: could not map CPU Subsystem registers\n");