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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-08-21 21:02:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 19:33:48 +0300 |
| commit | a1b5b43ffb84945cbdc5cbdb993d3195c7e77cbb (patch) | |
| tree | ab468342b6e3bca0ad358f07eb0ca2b3f90059b3 /drivers/bcma | |
| parent | 9a23a1d10bd0c25457d6dfda1b0e754bf8a8e973 (diff) | |
| download | linux-a1b5b43ffb84945cbdc5cbdb993d3195c7e77cbb.tar.xz | |
serial: sh-sci: Replace buggy big #ifdef by runtime logic
The #ifdef logic to clear SCxSR bits using RMW on SCIFA/SCIFB and SCIF
variants with some SCIFA features (sh7705/SH7720/sh7721) has several
drawbacks:
- It wasn't updated for newer R-Mobile variants (APE6),
- It doesn't correctly handle SoCs with both SCIF and SCIFA/B (e.g.
R-Car Gen2, but also legacy sh7723/sh7724),
- It doesn't play well with ARM multi-platform kernels: on R-Car Gen2,
SCIF/SCIFA/SCIFB/HSCIF were handled differently, depending on
whether r8a7740 or sh73a0 support was enabled or not,
Replace the #ifdef logic by runtime logic to fix this.
SCIFA/SCIFB and SCIF on sh7705/sh7720/sh7721 use RMW to clear error
bits, other variants use plain stores, as before.
Note that this changes behavior for SCIFA on sh7723/sh7724 (these SoCs
have both SCIF and SCIFA), which didn't use RMW before.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bcma')
0 files changed, 0 insertions, 0 deletions