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Commit 5d23188a authored by Ulrich Hecht's avatar Ulrich Hecht Committed by Greg Kroah-Hartman
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serial: sh-sci: make RX FIFO parameters tunable via sysfs 



Allows tuning of the RX FIFO fill threshold and timeout. (The latter is
only applicable to SCIFA and SCIFB).

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 03940376

drivers/tty/serial/sh-sci.c

+87 −0
Original line number Original line Diff line number Diff line
@@ -1055,6 +1055,66 @@ static void rx_fifo_timer_fn(unsigned long arg) 
	scif_set_rtrg(port, 1);

	scif_set_rtrg(port, 1);

}

}





static ssize_t rx_trigger_show(struct device *dev,

			       struct device_attribute *attr,

			       char *buf)

{

	struct uart_port *port = dev_get_drvdata(dev);

	struct sci_port *sci = to_sci_port(port);



	return sprintf(buf, "%d\n", sci->rx_trigger);

}



static ssize_t rx_trigger_store(struct device *dev,

				struct device_attribute *attr,

				const char *buf,

				size_t count)

{

	struct uart_port *port = dev_get_drvdata(dev);

	struct sci_port *sci = to_sci_port(port);

	long r;



	if (kstrtol(buf, 0, &r) == -EINVAL)

		return -EINVAL;

	sci->rx_trigger = scif_set_rtrg(port, r);

	scif_set_rtrg(port, 1);

	return count;

}



static DEVICE_ATTR(rx_fifo_trigger, 0644, rx_trigger_show, rx_trigger_store);



static ssize_t rx_fifo_timeout_show(struct device *dev,

			       struct device_attribute *attr,

			       char *buf)

{

	struct uart_port *port = dev_get_drvdata(dev);

	struct sci_port *sci = to_sci_port(port);



	return sprintf(buf, "%d\n", sci->rx_fifo_timeout);

}



static ssize_t rx_fifo_timeout_store(struct device *dev,

				struct device_attribute *attr,

				const char *buf,

				size_t count)

{

	struct uart_port *port = dev_get_drvdata(dev);

	struct sci_port *sci = to_sci_port(port);

	long r;



	if (kstrtol(buf, 0, &r) == -EINVAL)

		return -EINVAL;

	sci->rx_fifo_timeout = r;

	scif_set_rtrg(port, 1);

	if (r > 0)

		setup_timer(&sci->rx_fifo_timer, rx_fifo_timer_fn,

			    (unsigned long)sci);

	return count;

}



static DEVICE_ATTR(rx_fifo_timeout, 0644, rx_fifo_timeout_show, rx_fifo_timeout_store);





#ifdef CONFIG_SERIAL_SH_SCI_DMA

#ifdef CONFIG_SERIAL_SH_SCI_DMA

static void sci_dma_tx_complete(void *arg)

static void sci_dma_tx_complete(void *arg)

{

{
@@ -2886,6 +2946,15 @@ static int sci_remove(struct platform_device *dev) 




	sci_cleanup_single(port);

	sci_cleanup_single(port);





	if (port->port.fifosize > 1) {

		sysfs_remove_file(&dev->dev.kobj,

				  &dev_attr_rx_fifo_trigger.attr);

	}

	if (port->port.type == PORT_SCIFA || port->port.type == PORT_SCIFB) {

		sysfs_remove_file(&dev->dev.kobj,

				  &dev_attr_rx_fifo_timeout.attr);

	}



	return 0;

	return 0;

}

}
@@ -3051,6 +3120,24 @@ static int sci_probe(struct platform_device *dev) 
	if (ret)

	if (ret)

		return ret;

		return ret;





	if (sp->port.fifosize > 1) {

		ret = sysfs_create_file(&dev->dev.kobj,

				&dev_attr_rx_fifo_trigger.attr);

		if (ret)

			return ret;

	}

	if (sp->port.type == PORT_SCIFA || sp->port.type ==  PORT_SCIFB) {

		ret = sysfs_create_file(&dev->dev.kobj,

				&dev_attr_rx_fifo_timeout.attr);

		if (ret) {

			if (sp->port.fifosize > 1) {

				sysfs_remove_file(&dev->dev.kobj,

					&dev_attr_rx_fifo_trigger.attr);

			}

			return ret;

		}

	}



#ifdef CONFIG_SH_STANDARD_BIOS

#ifdef CONFIG_SH_STANDARD_BIOS

	sh_bios_gdb_detach();

	sh_bios_gdb_detach();

#endif

#endif