Author: neel
Date: Thu Jul 16 04:15:22 2015
New Revision: 285619
URL: https://svnweb.freebsd.org/changeset/base/285619
Log:
If uart interrupts are not functioning then schedule the callout to do the
polling at device attach time [1].
Add tunables 'debug.uart_force_poll' and 'debug.uart_poll_freq' to control
uart polling.
Submitted by: Aleksey Kuleshov (rnd...@yandex.ru) [1]
Modified:
head/sys/dev/uart/uart_core.c
Modified: head/sys/dev/uart/uart_core.c
==============================================================================
--- head/sys/dev/uart/uart_core.c Thu Jul 16 02:34:22 2015
(r285618)
+++ head/sys/dev/uart/uart_core.c Thu Jul 16 04:15:22 2015
(r285619)
@@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/reboot.h>
+#include <sys/sysctl.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
@@ -62,7 +63,12 @@ static MALLOC_DEFINE(M_UART, "UART", "UA
#define UART_POLL_FREQ 50
#endif
static int uart_poll_freq = UART_POLL_FREQ;
-TUNABLE_INT("debug.uart_poll_freq", &uart_poll_freq);
+SYSCTL_INT(_debug, OID_AUTO, uart_poll_freq, CTLFLAG_RDTUN, &uart_poll_freq,
+ 0, "UART poll frequency");
+
+static int uart_force_poll;
+SYSCTL_INT(_debug, OID_AUTO, uart_force_poll, CTLFLAG_RDTUN, &uart_force_poll,
+ 0, "Force UART polling");
void
uart_add_sysdev(struct uart_devinfo *di)
@@ -514,7 +520,7 @@ uart_bus_attach(device_t dev)
* conditions. We may have broken H/W and polling is probably the
* safest thing to do.
*/
- if (filt != FILTER_SCHEDULE_THREAD) {
+ if (filt != FILTER_SCHEDULE_THREAD && !uart_force_poll) {
sc->sc_irid = 0;
sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&sc->sc_irid, RF_ACTIVE | RF_SHAREABLE);
@@ -540,6 +546,8 @@ uart_bus_attach(device_t dev)
/* No interrupt resource. Force polled mode. */
sc->sc_polled = 1;
callout_init(&sc->sc_timer, 1);
+ callout_reset(&sc->sc_timer, hz / uart_poll_freq,
+ (timeout_t *)uart_intr, sc);
}
if (bootverbose && (sc->sc_fastintr || sc->sc_polled)) {
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