1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2003 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef _DEV_UART_BUS_H_
30 #define _DEV_UART_BUS_H_
31
32 #ifndef KLD_MODULE
33 #include "opt_uart.h"
34 #endif
35
36 #include <sys/serial.h>
37 #include <sys/timepps.h>
38
39 /* Drain and flush targets. */
40 #define UART_DRAIN_RECEIVER 0x0001
41 #define UART_DRAIN_TRANSMITTER 0x0002
42 #define UART_FLUSH_RECEIVER UART_DRAIN_RECEIVER
43 #define UART_FLUSH_TRANSMITTER UART_DRAIN_TRANSMITTER
44
45 /* Received character status bits. */
46 #define UART_STAT_BREAK 0x0100
47 #define UART_STAT_FRAMERR 0x0200
48 #define UART_STAT_OVERRUN 0x0400
49 #define UART_STAT_PARERR 0x0800
50
51 /* UART_IOCTL() requests */
52 #define UART_IOCTL_BREAK 1
53 #define UART_IOCTL_IFLOW 2
54 #define UART_IOCTL_OFLOW 3
55 #define UART_IOCTL_BAUD 4
56
57 /* UART quirk flags */
58 #define UART_F_BUSY_DETECT 0x1
59 #define UART_F_IGNORE_SPCR_REGSHFT 0x2
60
61 /*
62 * UART class & instance (=softc)
63 */
64 struct uart_class {
65 KOBJ_CLASS_FIELDS;
66 struct uart_ops *uc_ops; /* Low-level console operations. */
67 u_int uc_range; /* Bus space address range. */
68 u_int uc_rclk; /* Default rclk for this device. */
69 u_int uc_rshift; /* Default regshift for this device. */
70 u_int uc_riowidth; /* Default reg io width for this device. */
71 };
72
73 struct uart_softc {
74 KOBJ_FIELDS;
75 struct uart_class *sc_class;
76 struct uart_bas sc_bas;
77 device_t sc_dev;
78
79 struct mtx sc_hwmtx_s; /* Spinlock protecting hardware. */
80 struct mtx *sc_hwmtx;
81
82 struct resource *sc_rres; /* Register resource. */
83 int sc_rrid;
84 int sc_rtype; /* SYS_RES_{IOPORT|MEMORY}. */
85 struct resource *sc_ires; /* Interrupt resource. */
86 void *sc_icookie;
87 int sc_irid;
88 struct callout sc_timer;
89
90 bool sc_callout:1; /* This UART is opened for callout. */
91 bool sc_fastintr:1; /* This UART uses fast interrupts. */
92 bool sc_hwiflow:1; /* This UART has HW input flow ctl. */
93 bool sc_hwoflow:1; /* This UART has HW output flow ctl. */
94 bool sc_leaving:1; /* This UART is going away. */
95 bool sc_opened:1; /* This UART is open for business. */
96 bool sc_polled:1; /* This UART has no interrupts. */
97 bool sc_txbusy:1; /* This UART is transmitting. */
98 bool sc_isquelch:1; /* This UART has input squelched. */
99 bool sc_testintr:1; /* This UART is under int. testing. */
100
101 struct uart_devinfo *sc_sysdev; /* System device (or NULL). */
102
103 int sc_altbrk; /* State for alt break sequence. */
104 uint32_t sc_hwsig; /* Signal state. Used by HW driver. */
105
106 /* Receiver data. */
107 uint16_t *sc_rxbuf;
108 int sc_rxbufsz;
109 int sc_rxput;
110 int sc_rxget;
111 int sc_rxfifosz; /* Size of RX FIFO. */
112 int sc_rxoverruns;
113
114 /* Transmitter data. */
115 uint8_t *sc_txbuf;
116 int sc_txdatasz;
117 int sc_txfifosz; /* Size of TX FIFO and buffer. */
118
119 /* Pulse capturing support (PPS). */
120 struct pps_state sc_pps;
121 int sc_pps_mode;
122 sbintime_t sc_pps_captime;
123
124 /* Upper layer data. */
125 void *sc_softih;
126 uint32_t sc_ttypend;
127 union {
128 /* TTY specific data. */
129 struct {
130 struct tty *tp;
131 } u_tty;
132 /* Keyboard specific data. */
133 struct {
134 } u_kbd;
135 } sc_u;
136 };
137
138 extern const char uart_driver_name[];
139
140 int uart_bus_attach(device_t dev);
141 int uart_bus_detach(device_t dev);
142 int uart_bus_resume(device_t dev);
143 serdev_intr_t *uart_bus_ihand(device_t dev, int ipend);
144 int uart_bus_ipend(device_t dev);
145 int uart_bus_probe(device_t dev, int regshft, int regiowidth, int rclk, int rid, int chan, int quirks);
146 int uart_bus_sysdev(device_t dev);
147
148 void uart_sched_softih(struct uart_softc *, uint32_t);
149
150 int uart_tty_attach(struct uart_softc *);
151 int uart_tty_detach(struct uart_softc *);
152 struct mtx *uart_tty_getlock(struct uart_softc *);
153 void uart_tty_intr(void *arg);
154
155 /*
156 * Receive buffer operations.
157 */
158 static __inline int
uart_rx_empty(struct uart_softc * sc)159 uart_rx_empty(struct uart_softc *sc)
160 {
161
162 return ((sc->sc_rxget == sc->sc_rxput) ? 1 : 0);
163 }
164
165 static __inline int
uart_rx_full(struct uart_softc * sc)166 uart_rx_full(struct uart_softc *sc)
167 {
168
169 return ((sc->sc_rxput + 1 < sc->sc_rxbufsz) ?
170 (sc->sc_rxput + 1 == sc->sc_rxget) : (sc->sc_rxget == 0));
171 }
172
173 static __inline int
uart_rx_get(struct uart_softc * sc)174 uart_rx_get(struct uart_softc *sc)
175 {
176 int ptr, xc;
177
178 ptr = sc->sc_rxget;
179 if (ptr == sc->sc_rxput)
180 return (-1);
181 xc = sc->sc_rxbuf[ptr++];
182 sc->sc_rxget = (ptr < sc->sc_rxbufsz) ? ptr : 0;
183 return (xc);
184 }
185
186 static __inline int
uart_rx_next(struct uart_softc * sc)187 uart_rx_next(struct uart_softc *sc)
188 {
189 int ptr;
190
191 ptr = sc->sc_rxget;
192 if (ptr == sc->sc_rxput)
193 return (-1);
194 ptr += 1;
195 sc->sc_rxget = (ptr < sc->sc_rxbufsz) ? ptr : 0;
196 return (0);
197 }
198
199 static __inline int
uart_rx_peek(struct uart_softc * sc)200 uart_rx_peek(struct uart_softc *sc)
201 {
202 int ptr;
203
204 ptr = sc->sc_rxget;
205 return ((ptr == sc->sc_rxput) ? -1 : sc->sc_rxbuf[ptr]);
206 }
207
208 static __inline int
uart_rx_put(struct uart_softc * sc,int xc)209 uart_rx_put(struct uart_softc *sc, int xc)
210 {
211 int ptr;
212
213 ptr = (sc->sc_rxput + 1 < sc->sc_rxbufsz) ? sc->sc_rxput + 1 : 0;
214 if (ptr == sc->sc_rxget)
215 return (ENOSPC);
216 sc->sc_rxbuf[sc->sc_rxput] = xc;
217 sc->sc_rxput = ptr;
218 return (0);
219 }
220
221 #endif /* _DEV_UART_BUS_H_ */
222