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| author | Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> | 2015-03-16 16:19:19 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 21:42:27 (GMT) |
| commit | cb772fe75fa189c25ec258d36dabf914205e6635 (patch) | |
| tree | 1012966f1552d6cd26ae2f0c7791e53943c83680 /drivers/tty/serial | |
| parent | 0814e8d5da2b6f25088fe28d5e23f511d8441883 (diff) | |
| download | linux-cb772fe75fa189c25ec258d36dabf914205e6635.tar.xz | |
serial: sh-sci: Add overrun handling of SCIFA and SCIFB
SCIFA and SCIFB can detect the overrun, but it does not support.
This adds overrun handling of SCIFA and SCIFB.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 5b50c79..5bf9972 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -844,14 +844,32 @@ static int sci_handle_fifo_overrun(struct uart_port *port) struct tty_port *tport = &port->state->port; struct sci_port *s = to_sci_port(port); struct plat_sci_reg *reg; - int copied = 0; + int copied = 0, offset; + u16 status, bit; - reg = sci_getreg(port, SCLSR); + switch (port->type) { + case PORT_SCIF: + case PORT_HSCIF: + offset = SCLSR; + break; + case PORT_SCIFA: + case PORT_SCIFB: + offset = SCxSR; + break; + default: + return 0; + } + + reg = sci_getreg(port, offset); if (!reg->size) return 0; - if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) { - serial_port_out(port, SCLSR, 0); + status = serial_port_in(port, offset); + bit = 1 << s->overrun_bit; + + if (status & bit) { + status &= ~bit; + serial_port_out(port, offset, status); port->icount.overrun++; @@ -996,16 +1014,24 @@ static inline unsigned long port_rx_irq_mask(struct uart_port *port) static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) { - unsigned short ssr_status, scr_status, err_enabled; - unsigned short slr_status = 0; + unsigned short ssr_status, scr_status, err_enabled, orer_status = 0; struct uart_port *port = ptr; struct sci_port *s = to_sci_port(port); irqreturn_t ret = IRQ_NONE; ssr_status = serial_port_in(port, SCxSR); scr_status = serial_port_in(port, SCSCR); - if (port->type == PORT_SCIF || port->type == PORT_HSCIF) - slr_status = serial_port_in(port, SCLSR); + switch (port->type) { + case PORT_SCIF: + case PORT_HSCIF: + orer_status = serial_port_in(port, SCLSR); + break; + case PORT_SCIFA: + case PORT_SCIFB: + orer_status = ssr_status; + break; + } + err_enabled = scr_status & port_rx_irq_mask(port); /* Tx Interrupt */ @@ -1033,10 +1059,8 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) ret = sci_br_interrupt(irq, ptr); /* Overrun Interrupt */ - if (port->type == PORT_SCIF || port->type == PORT_HSCIF) { - if (slr_status & 0x01) - sci_handle_fifo_overrun(port); - } + if (orer_status & (1 << s->overrun_bit)) + sci_handle_fifo_overrun(port); return ret; } |