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Add workaround for CESA MBUS windows with 4GB DRAM

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Armada 38x SoC's equipped with 4GB DRAM suffer freeze
during CESA operation, if MBUS window opened at given
DRAM CS reaches end of the address space. Apply a workaround
by setting the window size to the closest possible
value, i.e. divide it by 2 (it has to be power-of-2).

Submitted by: Marcin Wojtas <mw@semihalf.com>
Obtained from: Semihalf
Sponsored by: Stormshield
Differential revision: https://reviews.freebsd.org/D10724
This commit is contained in:
Zbigniew Bodek 2017-05-25 14:25:05 +00:00
parent 0c79c0b138
commit fa5f501d0a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=318878
1 changed files with 16 additions and 1 deletions
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17
sys/arm/mv/mv_common.c
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@ -1116,6 +1116,7 @@ static void
decode_win_cesa_setup(u_long base)
{
uint32_t br, cr;
uint64_t size;
int i, j;
for (i = 0; i < MV_WIN_CESA_MAX; i++) {
@ -1128,7 +1129,21 @@ decode_win_cesa_setup(u_long base)
if (ddr_is_active(i)) {
br = ddr_base(i);
cr = (((ddr_size(i) - 1) & 0xffff0000) |
size = ddr_size(i);
#ifdef SOC_MV_ARMADA38X
/*
* Armada 38x SoC's equipped with 4GB DRAM
* suffer freeze during CESA operation, if
* MBUS window opened at given DRAM CS reaches
* end of the address space. Apply a workaround
* by setting the window size to the closest possible
* value, i.e. divide it by 2.
*/
if (size + ddr_base(i) == 0x100000000ULL)
size /= 2;
#endif
cr = (((size - 1) & 0xffff0000) |
(ddr_attr(i) << IO_WIN_ATTR_SHIFT) |
(ddr_target(i) << IO_WIN_TGT_SHIFT) |
IO_WIN_ENA_MASK);