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| author | neel <neel@FreeBSD.org> | 2015-07-16 04:15:22 +0000 |
|---|---|---|
| committer | neel <neel@FreeBSD.org> | 2015-07-16 04:15:22 +0000 |
| commit | a1c789ec2b3c00a8fa2047d81c6d2c5bb9bb805c (patch) | |
| tree | 0e978038d009cd759abf2091270b02306d94fd9d /sys/dev/uart/uart_core.c | |
| parent | ed4d6dbea261a4dc66b41c906a7fd91fc2332e4f (diff) | |
| download | FreeBSD-src-a1c789ec2b3c00a8fa2047d81c6d2c5bb9bb805c.zip FreeBSD-src-a1c789ec2b3c00a8fa2047d81c6d2c5bb9bb805c.tar.gz | |
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 (rndfax@yandex.ru) [1]
Diffstat (limited to 'sys/dev/uart/uart_core.c')
| -rw-r--r-- | sys/dev/uart/uart_core.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/sys/dev/uart/uart_core.c b/sys/dev/uart/uart_core.c index bbb06ff..4114f37 100644 --- a/sys/dev/uart/uart_core.c +++ b/sys/dev/uart/uart_core.c @@ -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", "UART driver"); #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)) { |
