root / prex-0.9.0 / bsp / drv / dev / serial / serial.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2008-2009, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * serial.c - machine independent driver for serial port.
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32 | */
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33 | |||
34 | #include <driver.h> |
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35 | #include <sys/ioctl.h> |
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36 | #include <tty.h> |
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37 | #include <cons.h> |
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38 | #include <serial.h> |
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39 | |||
40 | /* #define DEBUG_SERIAL 1 */
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41 | |||
42 | #ifdef DEBUG_SERIAL
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43 | #define DPRINTF(a) printf a
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44 | #else
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45 | #define DPRINTF(a)
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46 | #endif
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47 | |||
48 | struct serial_softc {
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49 | device_t dev; /* device object */
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50 | struct tty tty; /* tty structure */ |
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51 | struct serial_port *port; /* port setting */ |
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52 | struct serial_ops *ops; /* h/w operation */ |
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53 | }; |
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54 | |||
55 | /* Forward functions */
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56 | static int serial_init(struct driver *); |
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57 | static int serial_read(device_t, char *, size_t *, int); |
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58 | static int serial_write(device_t, char *, size_t *, int); |
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59 | static int serial_ioctl(device_t, u_long, void *); |
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60 | |||
61 | static int serial_cngetc(device_t); |
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62 | static void serial_cnputc(device_t, int); |
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63 | static void serial_cnpollc(device_t, int); |
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64 | |||
65 | |||
66 | static struct devops serial_devops = { |
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67 | /* open */ no_open,
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68 | /* close */ no_close,
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69 | /* read */ serial_read,
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70 | /* write */ serial_write,
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71 | /* ioctl */ serial_ioctl,
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72 | /* devctl */ no_devctl,
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73 | }; |
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74 | |||
75 | struct driver serial_driver = {
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76 | /* name */ "serial", |
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77 | /* devops */ &serial_devops,
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78 | /* devsz */ sizeof(struct serial_softc), |
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79 | /* flags */ 0, |
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80 | /* probe */ NULL, |
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81 | /* init */ serial_init,
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82 | /* unload */ NULL, |
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83 | }; |
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84 | |||
85 | static struct consdev serial_consdev = { |
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86 | /* dev */ NODEV,
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87 | /* devops */ &serial_devops,
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88 | /* cngetc */ serial_cngetc,
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89 | /* cnputc */ serial_cnputc,
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90 | /* cnpollc */ serial_cnpollc,
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91 | }; |
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92 | |||
93 | |||
94 | static int |
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95 | serial_read(device_t dev, char *buf, size_t *nbyte, int blkno) |
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96 | { |
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97 | struct serial_softc *sc = device_private(dev);
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98 | |||
99 | return tty_read(&sc->tty, buf, nbyte);
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100 | } |
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101 | |||
102 | static int |
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103 | serial_write(device_t dev, char *buf, size_t *nbyte, int blkno) |
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104 | { |
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105 | struct serial_softc *sc = device_private(dev);
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106 | |||
107 | return tty_write(&sc->tty, buf, nbyte);
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108 | } |
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109 | |||
110 | static int |
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111 | serial_ioctl(device_t dev, u_long cmd, void *arg)
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112 | { |
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113 | struct serial_softc *sc = device_private(dev);
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114 | |||
115 | return tty_ioctl(&sc->tty, cmd, arg);
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116 | } |
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117 | |||
118 | /*
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119 | * Start TTY output operation.
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120 | */
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121 | static void |
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122 | serial_start(struct tty *tp)
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123 | { |
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124 | struct serial_softc *sc = device_private(tp->t_dev);
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125 | struct serial_port *port = sc->port;
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126 | int c;
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127 | |||
128 | while ((c = tty_getc(&tp->t_outq)) >= 0) |
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129 | sc->ops->xmt_char(port, c); |
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130 | } |
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131 | |||
132 | /*
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133 | * Output completed.
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134 | */
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135 | void
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136 | serial_xmt_done(struct serial_port *port)
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137 | { |
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138 | |||
139 | tty_done(port->tty); |
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140 | } |
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141 | |||
142 | /*
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143 | * Character input.
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144 | */
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145 | void
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146 | serial_rcv_char(struct serial_port *port, char c) |
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147 | { |
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148 | |||
149 | tty_input(c, port->tty); |
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150 | } |
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151 | |||
152 | static int |
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153 | serial_cngetc(device_t dev) |
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154 | { |
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155 | struct serial_softc *sc = device_private(dev);
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156 | struct serial_port *port = sc->port;
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157 | |||
158 | return sc->ops->rcv_char(port);
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159 | } |
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160 | |||
161 | static void |
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162 | serial_cnputc(device_t dev, int c)
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163 | { |
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164 | struct serial_softc *sc = device_private(dev);
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165 | struct serial_port *port = sc->port;
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166 | |||
167 | sc->ops->xmt_char(port, c); |
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168 | } |
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169 | |||
170 | static void |
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171 | serial_cnpollc(device_t dev, int on)
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172 | { |
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173 | struct serial_softc *sc = device_private(dev);
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174 | struct serial_port *port = sc->port;
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175 | |||
176 | sc->ops->set_poll(port, on); |
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177 | } |
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178 | |||
179 | void
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180 | serial_attach(struct serial_ops *ops, struct serial_port *port) |
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181 | { |
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182 | struct serial_softc *sc;
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183 | device_t dev; |
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184 | int diag = 0; |
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185 | |||
186 | dev = device_create(&serial_driver, "tty", D_CHR|D_TTY);
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187 | |||
188 | sc = device_private(dev); |
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189 | sc->dev = dev; |
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190 | sc->ops = ops; |
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191 | sc->port = port; |
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192 | |||
193 | tty_attach(&sc->tty); |
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194 | sc->tty.t_dev = dev; |
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195 | sc->tty.t_oproc = serial_start; |
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196 | |||
197 | /* Start device */
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198 | port->tty = &sc->tty; |
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199 | ops->start(port); |
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200 | |||
201 | #ifdef CONFIG_DIAG_SERIAL
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202 | diag = 1;
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203 | #endif
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204 | serial_consdev.dev = dev; |
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205 | cons_attach(&serial_consdev, diag); |
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206 | } |
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207 | |||
208 | static int |
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209 | serial_init(struct driver *self)
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210 | { |
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211 | |||
212 | return 0; |
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213 | } |