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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-08-21 20:02:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 18:33:48 +0200 |
| commit | a1b5b43ffb84945cbdc5cbdb993d3195c7e77cbb (patch) | |
| tree | ab468342b6e3bca0ad358f07eb0ca2b3f90059b3 /drivers/tty/serial/sh-sci.h | |
| parent | serial: 8250: Fix autoconfig_irq() to avoid race conditions (diff) | |
| download | linux-a1b5b43ffb84945cbdc5cbdb993d3195c7e77cbb.tar.xz linux-a1b5b43ffb84945cbdc5cbdb993d3195c7e77cbb.zip | |
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/tty/serial/sh-sci.h')
| -rw-r--r-- | drivers/tty/serial/sh-sci.h | 33 |
1 files changed, 8 insertions, 25 deletions
diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h index 3393f67b4e84..1e1edbd15267 100644 --- a/drivers/tty/serial/sh-sci.h +++ b/drivers/tty/serial/sh-sci.h @@ -119,28 +119,11 @@ enum { #define SCxSR_ERRORS(port) (to_sci_port(port)->error_mask) -#if defined(CONFIG_CPU_SUBTYPE_SH7705) || \ - defined(CONFIG_CPU_SUBTYPE_SH7720) || \ - defined(CONFIG_CPU_SUBTYPE_SH7721) || \ - defined(CONFIG_ARCH_SH73A0) || \ - defined(CONFIG_ARCH_R8A7740) - -# define SCxSR_RDxF_CLEAR(port) \ - (serial_port_in(port, SCxSR) & SCIF_RDxF_CLEAR) -# define SCxSR_ERROR_CLEAR(port) \ - (serial_port_in(port, SCxSR) & SCIF_ERROR_CLEAR) -# define SCxSR_TDxE_CLEAR(port) \ - (serial_port_in(port, SCxSR) & SCIF_TDxE_CLEAR) -# define SCxSR_BREAK_CLEAR(port) \ - (serial_port_in(port, SCxSR) & SCIF_BREAK_CLEAR) -#else -# define SCxSR_RDxF_CLEAR(port) \ - ((((port)->type == PORT_SCI) ? SCI_RDxF_CLEAR : SCIF_RDxF_CLEAR) & 0xff) -# define SCxSR_ERROR_CLEAR(port) \ - ((((port)->type == PORT_SCI) ? SCI_ERROR_CLEAR : SCIF_ERROR_CLEAR) & 0xff) -# define SCxSR_TDxE_CLEAR(port) \ - ((((port)->type == PORT_SCI) ? SCI_TDxE_CLEAR : SCIF_TDxE_CLEAR) & 0xff) -# define SCxSR_BREAK_CLEAR(port) \ - ((((port)->type == PORT_SCI) ? SCI_BREAK_CLEAR : SCIF_BREAK_CLEAR) & 0xff) -#endif - +#define SCxSR_RDxF_CLEAR(port) \ + (((port)->type == PORT_SCI) ? SCI_RDxF_CLEAR : SCIF_RDxF_CLEAR) +#define SCxSR_ERROR_CLEAR(port) \ + (((port)->type == PORT_SCI) ? SCI_ERROR_CLEAR : SCIF_ERROR_CLEAR) +#define SCxSR_TDxE_CLEAR(port) \ + (((port)->type == PORT_SCI) ? SCI_TDxE_CLEAR : SCIF_TDxE_CLEAR) +#define SCxSR_BREAK_CLEAR(port) \ + (((port)->type == PORT_SCI) ? SCI_BREAK_CLEAR : SCIF_BREAK_CLEAR) |