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root/bsp/drv/dev/serial/serial.c/* [<][>][^][v][top][bottom][index][help] */DEFINITIONSThis source file includes following definitions.
1 /*- 2 * Copyright (c) 2008-2009, Kohsuke Ohtani 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * serial.c - machine independent driver for serial port. 32 */ 33 34 #include <driver.h> 35 #include <sys/ioctl.h> 36 #include <tty.h> 37 #include <cons.h> 38 #include <serial.h> 39 40 /* #define DEBUG_SERIAL 1 */ 41 42 #ifdef DEBUG_SERIAL 43 #define DPRINTF(a) printf a 44 #else 45 #define DPRINTF(a) 46 #endif 47 48 struct serial_softc { 49 device_t dev; /* device object */ 50 struct tty tty; /* tty structure */ 51 struct serial_port *port; /* port setting */ 52 struct serial_ops *ops; /* h/w operation */ 53 }; 54 55 /* Forward functions */ 56 static int serial_init(struct driver *); 57 static int serial_read(device_t, char *, size_t *, int); 58 static int serial_write(device_t, char *, size_t *, int); 59 static int serial_ioctl(device_t, u_long, void *); 60 61 static int serial_cngetc(device_t); 62 static void serial_cnputc(device_t, int); 63 static void serial_cnpollc(device_t, int); 64 65 66 static struct devops serial_devops = { 67 /* open */ no_open, 68 /* close */ no_close, 69 /* read */ serial_read, 70 /* write */ serial_write, 71 /* ioctl */ serial_ioctl, 72 /* devctl */ no_devctl, 73 }; 74 75 struct driver serial_driver = { 76 /* name */ "serial", 77 /* devops */ &serial_devops, 78 /* devsz */ sizeof(struct serial_softc), 79 /* flags */ 0, 80 /* probe */ NULL, 81 /* init */ serial_init, 82 /* unload */ NULL, 83 }; 84 85 static struct consdev serial_consdev = { 86 /* dev */ NODEV, 87 /* devops */ &serial_devops, 88 /* cngetc */ serial_cngetc, 89 /* cnputc */ serial_cnputc, 90 /* cnpollc */ serial_cnpollc, 91 }; 92 93 94 static int 95 serial_read(device_t dev, char *buf, size_t *nbyte, int blkno) 96 { 97 struct serial_softc *sc = device_private(dev); 98 99 return tty_read(&sc->tty, buf, nbyte); 100 } 101 102 static int 103 serial_write(device_t dev, char *buf, size_t *nbyte, int blkno) 104 { 105 struct serial_softc *sc = device_private(dev); 106 107 return tty_write(&sc->tty, buf, nbyte); 108 } 109 110 static int 111 serial_ioctl(device_t dev, u_long cmd, void *arg) 112 { 113 struct serial_softc *sc = device_private(dev); 114 115 return tty_ioctl(&sc->tty, cmd, arg); 116 } 117 118 /* 119 * Start TTY output operation. 120 */ 121 static void 122 serial_start(struct tty *tp) 123 { 124 struct serial_softc *sc = device_private(tp->t_dev); 125 struct serial_port *port = sc->port; 126 int c; 127 128 while ((c = tty_getc(&tp->t_outq)) >= 0) 129 sc->ops->xmt_char(port, c); 130 } 131 132 /* 133 * Output completed. 134 */ 135 void 136 serial_xmt_done(struct serial_port *port) 137 { 138 139 tty_done(port->tty); 140 } 141 142 /* 143 * Character input. 144 */ 145 void 146 serial_rcv_char(struct serial_port *port, char c) 147 { 148 149 tty_input(c, port->tty); 150 } 151 152 static int 153 serial_cngetc(device_t dev) 154 { 155 struct serial_softc *sc = device_private(dev); 156 struct serial_port *port = sc->port; 157 158 return sc->ops->rcv_char(port); 159 } 160 161 static void 162 serial_cnputc(device_t dev, int c) 163 { 164 struct serial_softc *sc = device_private(dev); 165 struct serial_port *port = sc->port; 166 167 sc->ops->xmt_char(port, c); 168 } 169 170 static void 171 serial_cnpollc(device_t dev, int on) 172 { 173 struct serial_softc *sc = device_private(dev); 174 struct serial_port *port = sc->port; 175 176 sc->ops->set_poll(port, on); 177 } 178 179 void 180 serial_attach(struct serial_ops *ops, struct serial_port *port) 181 { 182 struct serial_softc *sc; 183 device_t dev; 184 int diag = 0; 185 186 dev = device_create(&serial_driver, "tty", D_CHR|D_TTY); 187 188 sc = device_private(dev); 189 sc->dev = dev; 190 sc->ops = ops; 191 sc->port = port; 192 193 tty_attach(&sc->tty); 194 sc->tty.t_dev = dev; 195 sc->tty.t_oproc = serial_start; 196 197 /* Start device */ 198 port->tty = &sc->tty; 199 ops->start(port); 200 201 #ifdef CONFIG_DIAG_SERIAL 202 diag = 1; 203 #endif 204 serial_consdev.dev = dev; 205 cons_attach(&serial_consdev, diag); 206 } 207 208 static int 209 serial_init(struct driver *self) 210 { 211 212 return 0; 213 } /* [<][>][^][v][top][bottom][index][help] */ | |||
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Copyright© 2005-2009 Kohsuke Ohtani |
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