mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

serial: sh-sci: Consolidate RXD pin handling. 

Non-SCI parts do not have the special port reg necessary for cases where
the RX and SCI pins are muxed and need to be manually polled, so these
like always fall back on the normal FIFO processing paths. SH7760 is in a
class in and of itself with regards to mapping its SIM card interface via
the SCI port class despite not having any of the RXD lines wired up and
so implicitly behaving more like a SCIF in this regard. Out of the other
CPUs, some support the port check via the same block while others do it
through an external SuperI/O, so it's not even possible to perform the
check relative to the ioremapped cookie offset, so the separate read
semantics are preserved here, too.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2011-06-08 18:51:32 +09:00
parent debf950716
commit 514820eb98
5 changed files with 17 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/sh/kernel/cpu/sh3/setup-sh770x.c
View File

@ -108,6 +108,7 @@ static struct platform_device rtc_device = {
static struct plat_sci_port scif0_platform_data = {
.mapbase = 0xfffffe80,
.port_reg = 0xa4000136,
.flags = UPF_BOOT_AUTOCONF,
.scscr = SCSCR_TE | SCSCR_RE,
.scbrr_algo_id = SCBRR_ALGO_2,

1
arch/sh/kernel/cpu/sh4/setup-sh7750.c
View File

@ -38,6 +38,7 @@ static struct platform_device rtc_device = {
static struct plat_sci_port sci_platform_data = {
.mapbase = 0xffe00000,
.port_reg = 0xffe0001C
.flags = UPF_BOOT_AUTOCONF,
.scscr = SCSCR_TE | SCSCR_RE,
.scbrr_algo_id = SCBRR_ALGO_2,

13
drivers/tty/serial/sh-sci.c
View File

@ -363,6 +363,19 @@ static int sci_rxfill(struct uart_port *port)
return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
}
/*
* SCI helper for checking the state of the muxed port/RXD pins.
*/
static inline int sci_rxd_in(struct uart_port *port)
{
struct sci_port *s = to_sci_port(port);
if (s->cfg->port_reg <= 0)
return 1;
return !!__raw_readb(s->cfg->port_reg);
}
/* ********************************************************************** *
* the interrupt related routines *
* ********************************************************************** */

29
drivers/tty/serial/sh-sci.h
View File

@ -287,32 +287,3 @@ SCIF_FNS(SCLSR, 0, 0, 0x24, 16)
#endif
#define sci_in(port, reg) sci_##reg##_in(port)
#define sci_out(port, reg, value) sci_##reg##_out(port, value)
#if defined(CONFIG_CPU_SUBTYPE_SH7706) || \
defined(CONFIG_CPU_SUBTYPE_SH7707) || \
defined(CONFIG_CPU_SUBTYPE_SH7708) || \
defined(CONFIG_CPU_SUBTYPE_SH7709)
static inline int sci_rxd_in(struct uart_port *port)
{
if (port->mapbase == 0xfffffe80)
return __raw_readb(SCPDR)&0x01 ? 1 : 0; /* SCI */
return 1;
}
#elif defined(CONFIG_CPU_SUBTYPE_SH7750) || \
defined(CONFIG_CPU_SUBTYPE_SH7751) || \
defined(CONFIG_CPU_SUBTYPE_SH7751R) || \
defined(CONFIG_CPU_SUBTYPE_SH7750R) || \
defined(CONFIG_CPU_SUBTYPE_SH7750S) || \
defined(CONFIG_CPU_SUBTYPE_SH7091)
static inline int sci_rxd_in(struct uart_port *port)
{
if (port->mapbase == 0xffe00000)
return __raw_readb(SCSPTR1)&0x01 ? 1 : 0; /* SCI */
return 1;
}
#else /* default case for non-SCI processors */
static inline int sci_rxd_in(struct uart_port *port)
{
return 1;
}
#endif

2
include/linux/serial_sci.h
View File

@ -86,6 +86,8 @@ struct plat_sci_port {
int overrun_bit;
unsigned int error_mask;
int port_reg;
struct device *dma_dev;
unsigned int dma_slave_tx;