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Commit a380ed46 authored by Ulrich Hecht's avatar Ulrich Hecht Committed by Greg Kroah-Hartman
Browse files

serial: sh-sci: implement FIFO threshold register setting 



Sets the closest match for a desired RX trigger level.

Signed-off-by: default avatarUlrich Hecht <ulrich.hecht+renesas@gmail.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 88641c79

drivers/tty/serial/sh-sci.c

+59 −0
Original line number Diff line number Diff line
@@ -974,6 +974,65 @@ static int sci_handle_breaks(struct uart_port *port) 
	return copied;

}



static int scif_set_rtrg(struct uart_port *port, int rx_trig)

{

	unsigned int bits;



	if (rx_trig < 1)

		rx_trig = 1;

	if (rx_trig >= port->fifosize)

		rx_trig = port->fifosize;



	/* HSCIF can be set to an arbitrary level. */

	if (sci_getreg(port, HSRTRGR)->size) {

		serial_port_out(port, HSRTRGR, rx_trig);

		return rx_trig;

	}



	switch (port->type) {

	case PORT_SCIF:

		if (rx_trig < 4) {

			bits = 0;

			rx_trig = 1;

		} else if (rx_trig < 8) {

			bits = SCFCR_RTRG0;

			rx_trig = 4;

		} else if (rx_trig < 14) {

			bits = SCFCR_RTRG1;

			rx_trig = 8;

		} else {

			bits = SCFCR_RTRG0 | SCFCR_RTRG1;

			rx_trig = 14;

		}

		break;

	case PORT_SCIFA:

	case PORT_SCIFB:

		if (rx_trig < 16) {

			bits = 0;

			rx_trig = 1;

		} else if (rx_trig < 32) {

			bits = SCFCR_RTRG0;

			rx_trig = 16;

		} else if (rx_trig < 48) {

			bits = SCFCR_RTRG1;

			rx_trig = 32;

		} else {

			bits = SCFCR_RTRG0 | SCFCR_RTRG1;

			rx_trig = 48;

		}

		break;

	default:

		WARN(1, "unknown FIFO configuration");

		return 1;

	}



	serial_port_out(port, SCFCR,

		(serial_port_in(port, SCFCR) &

		~(SCFCR_RTRG1 | SCFCR_RTRG0)) | bits);



	return rx_trig;

}



#ifdef CONFIG_SERIAL_SH_SCI_DMA

static void sci_dma_tx_complete(void *arg)

{