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authorUlrich Hecht <ulrich.hecht+renesas@gmail.com>2017-02-03 11:38:19 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-06 09:47:52 +0100
commit5d23188a473da0b2fe6849ccf03578eebfead30e (patch)
treea7057d0c1c137284ce6aacaa620d939ef43357ea /drivers/tty
parent039403765e5da3c6a4c2cc048c201bfad932033a (diff)
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: Ulrich Hecht <ulrich.hecht+renesas@gmail.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sh-sci.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 4a165ed1bc3f..f95a56ca936e 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1055,6 +1055,66 @@ static void rx_fifo_timer_fn(unsigned long arg)
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
static void sci_dma_tx_complete(void *arg)
{
@@ -2886,6 +2946,15 @@ static int sci_remove(struct platform_device *dev)
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;
}
@@ -3051,6 +3120,24 @@ static int sci_probe(struct platform_device *dev)
if (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
sh_bios_gdb_detach();
#endif