Add support for using uart(4) for pulse capturing for the Pulse Per

Second (PPS) timing interface. The support is non-optional and by
default uses the DCD line signal as the pulse input. A compile-time
option (UART_PPS_ON_CTS) can be used to have uart(4) use the CTS line
signal.

Include <sys/timepps.h> in uart_bus.h to avoid having to add the
inclusion of that header in all source files.

Reviewed by: phk

1 files changed, 17 insertions, 0 deletions

diff --git a/sys/dev/uart/uart_bus.h b/sys/dev/uart/uart_bus.h
index 71aa1be..bd0bab7 100644
--- a/sys/dev/uart/uart_bus.h
+++ b/sys/dev/uart/uart_bus.h
@@ -29,6 +29,12 @@
 #ifndef _DEV_UART_BUS_H_
 #define _DEV_UART_BUS_H_
 
+#ifndef KLD_MODULE
+#include "opt_uart.h"
+#endif
+
+#include <sys/timepps.h>
+
 /* Drain and flush targets. */
 #define	UART_DRAIN_RECEIVER	0x0001
 #define	UART_DRAIN_TRANSMITTER	0x0002
@@ -75,6 +81,14 @@
 #define	UART_SIGMASK_STATE	0x003f
 #define	UART_SIGMASK_DELTA	0x3f00
 
+#ifdef UART_PPS_ON_CTS
+#define	UART_SIG_DPPS		UART_SIG_DCTS
+#define	UART_SIG_PPS		UART_SIG_CTS
+#else
+#define	UART_SIG_DPPS		UART_SIG_DDCD
+#define	UART_SIG_PPS		UART_SIG_DCD
+#endif
+
 /* UART_IOCTL() requests */
 #define	UART_IOCTL_BREAK	1
 #define	UART_IOCTL_IFLOW	2
@@ -133,6 +147,9 @@ struct uart_softc {
 	int		sc_txdatasz;
 	int		sc_txfifosz;	/* Size of TX FIFO and buffer. */
 
+	/* Pulse capturing support (PPS). */
+	struct pps_state sc_pps;
+
 	/* Upper layer data. */
 	void		*sc_softih;
 	uint32_t	sc_ttypend;