summaryrefslogtreecommitdiffstats
path: root/sys/dev/uart/uart_bus.h
blob: b1498f5f0a99a73c055f1a96481dee2feebc3d00 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
/*-
 * Copyright (c) 2003 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef _DEV_UART_BUS_H_
#define _DEV_UART_BUS_H_

#ifndef KLD_MODULE
#include "opt_uart.h"
#endif

#include <sys/serial.h>
#include <sys/timepps.h>

/* Drain and flush targets. */
#define	UART_DRAIN_RECEIVER	0x0001
#define	UART_DRAIN_TRANSMITTER	0x0002
#define	UART_FLUSH_RECEIVER	UART_DRAIN_RECEIVER
#define	UART_FLUSH_TRANSMITTER	UART_DRAIN_TRANSMITTER

/* Received character status bits. */
#define	UART_STAT_BREAK		0x0100
#define	UART_STAT_FRAMERR	0x0200
#define	UART_STAT_OVERRUN	0x0400
#define	UART_STAT_PARERR	0x0800

#ifdef UART_PPS_ON_CTS
#define	UART_SIG_DPPS		SER_DCTS
#define	UART_SIG_PPS		SER_CTS
#else
#define	UART_SIG_DPPS		SER_DDCD
#define	UART_SIG_PPS		SER_DCD
#endif

/* UART_IOCTL() requests */
#define	UART_IOCTL_BREAK	1
#define	UART_IOCTL_IFLOW	2
#define	UART_IOCTL_OFLOW	3
#define	UART_IOCTL_BAUD		4

/*
 * UART class & instance (=softc)
 */
struct uart_class {
	KOBJ_CLASS_FIELDS;
	struct uart_ops *uc_ops;	/* Low-level console operations. */
	u_int	uc_range;		/* Bus space address range. */
	u_int	uc_rclk;		/* Default rclk for this device. */
};

struct uart_softc {
	KOBJ_FIELDS;
	struct uart_class *sc_class;
	struct uart_bas	sc_bas;
	device_t	sc_dev;

	struct mtx	sc_hwmtx_s;	/* Spinlock protecting hardware. */
	struct mtx	*sc_hwmtx;

	struct resource	*sc_rres;	/* Register resource. */
	int		sc_rrid;
	int		sc_rtype;	/* SYS_RES_{IOPORT|MEMORY}. */
	struct resource *sc_ires;	/* Interrupt resource. */
	void		*sc_icookie;
	int		sc_irid;

	int		sc_callout:1;	/* This UART is opened for callout. */
	int		sc_fastintr:1;	/* This UART uses fast interrupts. */
	int		sc_hwiflow:1;	/* This UART has HW input flow ctl. */
	int		sc_hwoflow:1;	/* This UART has HW output flow ctl. */
	int		sc_leaving:1;	/* This UART is going away. */
	int		sc_opened:1;	/* This UART is open for business. */
	int		sc_polled:1;	/* This UART has no interrupts. */
	int		sc_txbusy:1;	/* This UART is transmitting. */
	int		sc_isquelch:1;	/* This UART has input squelched. */

	struct uart_devinfo *sc_sysdev;	/* System device (or NULL). */

	int		sc_altbrk;	/* State for alt break sequence. */
	uint32_t	sc_hwsig;	/* Signal state. Used by HW driver. */

	/* Receiver data. */
	uint16_t	*sc_rxbuf;
	int		sc_rxbufsz;
	int		sc_rxput;
	int		sc_rxget;
	int		sc_rxfifosz;	/* Size of RX FIFO. */

	/* Transmitter data. */
	uint8_t		*sc_txbuf;
	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;
	union {
		/* TTY specific data. */
		struct {
			struct tty *tp;
		} u_tty;
		/* Keyboard specific data. */
		struct {
		} u_kbd;
	} sc_u;
};

extern devclass_t uart_devclass;
extern char uart_driver_name[];

int uart_bus_attach(device_t dev);
int uart_bus_detach(device_t dev);
serdev_intr_t *uart_bus_ihand(device_t dev, int ipend);
int uart_bus_ipend(device_t dev);
int uart_bus_probe(device_t dev, int regshft, int rclk, int rid, int chan);
int uart_bus_sysdev(device_t dev);

void uart_sched_softih(struct uart_softc *, uint32_t);

int uart_tty_attach(struct uart_softc *);
int uart_tty_detach(struct uart_softc *);
void uart_tty_intr(void *arg);

/*
 * Receive buffer operations.
 */
static __inline int
uart_rx_empty(struct uart_softc *sc)
{
	return ((sc->sc_rxget == sc->sc_rxput) ? 1 : 0);
}

static __inline int
uart_rx_full(struct uart_softc *sc)
{
	return ((sc->sc_rxput + 1 < sc->sc_rxbufsz)
	    ? (sc->sc_rxput + 1 == sc->sc_rxget) : (sc->sc_rxget == 0));
}

static __inline int
uart_rx_get(struct uart_softc *sc)
{
	int ptr, xc;

	ptr = sc->sc_rxget;
	if (ptr == sc->sc_rxput)
		return (-1);
	xc = sc->sc_rxbuf[ptr++];
	sc->sc_rxget = (ptr < sc->sc_rxbufsz) ? ptr : 0;
	return (xc);
}

static __inline int
uart_rx_next(struct uart_softc *sc)
{
	int ptr;

	ptr = sc->sc_rxget;
	if (ptr == sc->sc_rxput)
		return (-1);
	ptr += 1;
	sc->sc_rxget = (ptr < sc->sc_rxbufsz) ? ptr : 0;
	return (0);
}

static __inline int
uart_rx_peek(struct uart_softc *sc)
{
	int ptr;

	ptr = sc->sc_rxget;
	return ((ptr == sc->sc_rxput) ? -1 : sc->sc_rxbuf[ptr]);
}

static __inline int
uart_rx_put(struct uart_softc *sc, int xc)
{
	int ptr;

	ptr = (sc->sc_rxput + 1 < sc->sc_rxbufsz) ? sc->sc_rxput + 1 : 0;
	if (ptr == sc->sc_rxget)
		return (ENOSPC);
	sc->sc_rxbuf[sc->sc_rxput] = xc;
	sc->sc_rxput = ptr;
	return (0);
}

#endif /* _DEV_UART_BUS_H_ */
OpenPOWER on IntegriCloud