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annotate packages/io/serial/current/src/i386/pc_serial.c @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
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76
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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1 //==========================================================================
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2 //
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3 // io/serial/i386/pc_serial.c
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4 //
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5 // i386 PC Serial I/O Interface Module (interrupt driven)
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6 // for use with 8250s or 16550s.
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7 //
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8 //==========================================================================
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9 //####COPYRIGHTBEGIN####
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10 //
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11 // -------------------------------------------
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12 // The contents of this file are subject to the Red Hat eCos Public License
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13 // Version 1.0 (the "License"); you may not use this file except in
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14 // compliance with the License. You may obtain a copy of the License at
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15 // http://sourceware.cygnus.com/ecos
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16 //
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17 // Software distributed under the License is distributed on an
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18 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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19 // License for the specific language governing rights and limitations under
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20 // the License.
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21 //
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22 // The Original Code is eCos - Embedded Configurable Operating System,
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23 // released September 30, 1998.
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24 //
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25 // The Initial Developer of the Original Code is Red Hat.
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26 // Portions created by Red Hat are
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27 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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28 // All Rights Reserved.
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29 // -------------------------------------------
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30 //
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31 //####COPYRIGHTEND####
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32 //==========================================================================
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33 //#####DESCRIPTIONBEGIN####
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34 //
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35 // Author(s): gthomas
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36 // Contributors: gthomas, pjo
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37 // Date: 1999-02-04
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38 // Purpose: AEB-1 Serial I/O module (interrupt driven version)
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39 // Description:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
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45 #include <pkgconf/system.h>
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46 #include <pkgconf/io_serial.h>
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47 #include <pkgconf/io.h>
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48 #include <cyg/io/io.h>
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49 #include <cyg/hal/hal_intr.h>
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50 #include <cyg/io/devtab.h>
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51 #include <cyg/io/serial.h>
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52 #include <cyg/infra/diag.h>
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53
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54 #ifdef CYGPKG_IO_SERIAL_I386_PC
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55
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56 #include "pc_serial.h"
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57
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58 typedef struct pc_serial_info {
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59 CYG_ADDRWORD base;
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60 CYG_WORD int_num;
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61 cyg_interrupt serial_interrupt;
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62 cyg_handle_t serial_interrupt_handle;
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63 enum { sNone = 0,
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64 s8250,
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65 s16450,
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66 s16550,
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67 s16550a
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68 } deviceType ;
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69 unsigned char _ier ;
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70 unsigned char charsInTransmitter ;
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71 } pc_serial_info;
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72
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73 static bool pc_serial_init(struct cyg_devtab_entry *tab);
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74 static bool pc_serial_putc(serial_channel *chan, unsigned char c);
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75 static Cyg_ErrNo pc_serial_lookup(struct cyg_devtab_entry **tab,
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76 struct cyg_devtab_entry *sub_tab,
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77 const char *name);
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78 static unsigned char pc_serial_getc(serial_channel *chan);
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79 static bool pc_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);
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80 static void pc_serial_start_xmit(serial_channel *chan);
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81 static void pc_serial_stop_xmit(serial_channel *chan);
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82
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83 static cyg_uint32 pc_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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84 static void pc_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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85
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86 static SERIAL_FUNS(pc_serial_funs,
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87 pc_serial_putc,
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88 pc_serial_getc,
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89 pc_serial_set_config,
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90 pc_serial_start_xmit,
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91 pc_serial_stop_xmit
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92 );
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93
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94 #ifdef CYGPKG_IO_SERIAL_I386_PC_SERIAL0
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95 static pc_serial_info pc_serial_info0 = { CYGNUM_IO_SERIAL_I386_PC_SERIAL0_IOBASE,
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96 CYGNUM_IO_SERIAL_I386_PC_SERIAL0_INT};
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97 #if CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BUFSIZE > 0
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98 static unsigned char pc_serial_out_buf0[CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BUFSIZE];
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99 static unsigned char pc_serial_in_buf0[CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BUFSIZE];
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100
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101 static SERIAL_CHANNEL_USING_INTERRUPTS(pc_serial_channel0,
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102 pc_serial_funs,
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103 pc_serial_info0,
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104 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BAUD),
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105 CYG_SERIAL_STOP_DEFAULT,
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106 CYG_SERIAL_PARITY_DEFAULT,
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107 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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108 CYG_SERIAL_FLAGS_DEFAULT,
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109 &pc_serial_out_buf0[0], sizeof(pc_serial_out_buf0),
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110 &pc_serial_in_buf0[0], sizeof(pc_serial_in_buf0)
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111 );
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112 #else
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113 static SERIAL_CHANNEL(pc_serial_channel0,
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114 pc_serial_funs,
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115 pc_serial_info0,
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116 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BAUD),
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117 CYG_SERIAL_STOP_DEFAULT,
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118 CYG_SERIAL_PARITY_DEFAULT,
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119 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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120 CYG_SERIAL_FLAGS_DEFAULT
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121 );
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122 #endif
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123
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124 DEVTAB_ENTRY(pc_serial_io0,
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diff changeset
125 CYGDAT_IO_SERIAL_I386_PC_SERIAL0_NAME,
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126 0, // Does not depend on a lower level interface
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127 &cyg_io_serial_devio,
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128 pc_serial_init,
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129 pc_serial_lookup, // Serial driver may need initializing
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diff changeset
130 &pc_serial_channel0
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131 );
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
132 #endif // CYGPKG_IO_SERIAL_I386_PC_SERIAL0
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diff changeset
133
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diff changeset
134 #ifdef CYGPKG_IO_SERIAL_I386_PC_SERIAL1
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135 static pc_serial_info pc_serial_info1 = { CYGNUM_IO_SERIAL_I386_PC_SERIAL1_IOBASE,
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diff changeset
136 CYGNUM_IO_SERIAL_I386_PC_SERIAL1_INT};
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137 #if CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BUFSIZE > 0
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
138 static unsigned char pc_serial_out_buf1[CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BUFSIZE];
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diff changeset
139 static unsigned char pc_serial_in_buf1[CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BUFSIZE];
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diff changeset
140
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
141 static SERIAL_CHANNEL_USING_INTERRUPTS(pc_serial_channel1,
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diff changeset
142 pc_serial_funs,
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
143 pc_serial_info1,
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diff changeset
144 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BAUD),
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145 CYG_SERIAL_STOP_DEFAULT,
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146 CYG_SERIAL_PARITY_DEFAULT,
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147 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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diff changeset
148 CYG_SERIAL_FLAGS_DEFAULT,
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149 &pc_serial_out_buf1[0], sizeof(pc_serial_out_buf1),
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150 &pc_serial_in_buf1[0], sizeof(pc_serial_in_buf1)
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151 );
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
152 #else
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153 static SERIAL_CHANNEL(pc_serial_channel1,
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diff changeset
154 pc_serial_funs,
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
155 pc_serial_info1,
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diff changeset
156 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BAUD),
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diff changeset
157 CYG_SERIAL_STOP_DEFAULT,
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diff changeset
158 CYG_SERIAL_PARITY_DEFAULT,
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159 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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diff changeset
160 CYG_SERIAL_FLAGS_DEFAULT
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diff changeset
161 );
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
162 #endif
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
163
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diff changeset
164 DEVTAB_ENTRY(pc_serial_io1,
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diff changeset
165 CYGDAT_IO_SERIAL_I386_PC_SERIAL1_NAME,
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166 0, // Does not depend on a lower level interface
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167 &cyg_io_serial_devio,
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diff changeset
168 pc_serial_init,
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
169 pc_serial_lookup, // Serial driver may need initializing
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
170 &pc_serial_channel1
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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171 );
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
172 #endif // CYGPKG_IO_SERIAL_I386_PC_SERIAL1
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diff changeset
173
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
174
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
175 void pc_outb(int port, int byte) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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176 int pc_inb(int port) ;
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diff changeset
177
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diff changeset
178
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diff changeset
179 // Internal function to actually configure the hardware to desired baud rate, etc.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
180 static bool pc_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
181 {
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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182 pc_serial_info * port = (pc_serial_info *) chan->dev_priv;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
183 unsigned short baud_divisor = select_baud[new_config->baud];
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
184 unsigned char _lcr ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
185 if (baud_divisor == 0) return false;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
186
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
187 // Initialize the device, if necessary. First, find out what kind of device
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diff changeset
188 // it is. Use a while() loop so that we can break to the next statement;
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189 // otherwise we'd have an avalanche of if/else, which can become very
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diff changeset
190 // difficult to understand.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
191 while (init)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
192 { port->deviceType = sNone ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
193 pc_outb(port->base + MCR, MCR_LOOP) ;
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diff changeset
194 if (pc_inb(port->base + MSR) & 0xF0)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
195 break ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
196 pc_outb(port->base + MCR, MCR_LOOP | 0xF) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
197 if ((pc_inb(port->base + MSR) & 0xF0) != 0xF0)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
198 break;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
199 // So we have at least an 8250.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
200 pc_outb(port->base + MCR, 0x00) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
201 port->deviceType = s8250 ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
202 // Check for a scratch register; scratch register indicates 16450 or above.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
203 pc_outb(port->base + SCR, 0x55) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
204 if (pc_inb(port->base + SCR) != 0x55)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
205 break ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
206 pc_outb(port->base + SCR, 0xAA) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
207 if (pc_inb(port->base + SCR) != 0xAA)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
208 break;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
209 // Check for a FIFO
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
210 pc_outb(port->base + FCR, FCR_FE) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
211 if ((pc_inb(port->base + ISR) & 0x80) == 0)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
212 break ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
213 port->deviceType = s16550 ; // Note! 16550 fifo's don't work!
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
214 if ((pc_inb(port->base + ISR) & 0x40) == 0)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
215 break ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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216 port->deviceType = s16550a ; // But 16550A fifos do.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
217 break;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
218 }
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
219
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
220 port->_ier = pc_inb(port->base + IER);
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
221 pc_outb(port->base + IER, 0) ; // Disable port interrupts while changing hardware
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
222 _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
223 select_stop_bits[new_config->stop] |
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
224 select_parity[new_config->parity];
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
225 pc_outb(port->base + LCR, _lcr | LCR_DL) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
226 pc_outb(port->base + MDL, baud_divisor >> 8) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
227 pc_outb(port->base + LDL, baud_divisor & 0xFF) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
228 pc_outb(port->base + LCR, _lcr) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
229
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
230 if (init)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
231 { if (port->deviceType == s16550a)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
232 pc_outb(port->base + FCR, FCR_FE | FCR_RFR | FCR_TFR | FCR_RT14);
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
233 else
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
234 pc_outb(port->base + FCR, 0);
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
235
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
236 if (chan->out_cbuf.len != 0)
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
237 pc_outb(port->base + IER, IER_RCV) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
238 else
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
239 pc_outb(port->base + IER, 0) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
240 // port->_ier = MCR_INT | MCR_DTR | MCR_RTS ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
241 // port->_ier = IER_RCV | IER_LS | IER_MS ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
242 pc_outb(port->base + MCR, MCR_INT | MCR_DTR | MCR_RTS) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
243 port->_ier = IER_RCV ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
244 }
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245
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246 pc_outb(port->base + IER, port->_ier) ;
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247
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248 if (new_config != &chan->config)
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249 chan->config = *new_config;
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250
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251 return true;
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252 }
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253
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254
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255
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256 // Function to initialize the device. Called at bootstrap time.
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257 static bool pc_serial_init(struct cyg_devtab_entry * tab)
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258 {
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259 serial_channel *chan = (serial_channel *)tab->priv;
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260 pc_serial_info *pc_chan = (pc_serial_info *)chan->dev_priv;
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261 #ifdef CYGDBG_IO_INIT
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262 diag_printf("I386_PC SERIAL init - dev: %x.%d\n", pc_chan->base, pc_chan->int_num);
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263 #endif
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264 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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265 if (chan->out_cbuf.len != 0) {
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266 cyg_drv_interrupt_create(pc_chan->int_num,
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267 99, // Priority - unused
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268 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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269 pc_serial_ISR,
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270 pc_serial_DSR,
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271 &pc_chan->serial_interrupt_handle,
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272 &pc_chan->serial_interrupt);
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273 cyg_drv_interrupt_attach(pc_chan->serial_interrupt_handle);
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274 cyg_drv_interrupt_unmask(pc_chan->int_num);
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275 }
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276 pc_serial_config_port(chan, &chan->config, true);
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277 return true;
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278 }
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279
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280
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281
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282 // This routine is called when the device is "looked" up (i.e. attached)
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283 static Cyg_ErrNo pc_serial_lookup(struct cyg_devtab_entry **tab,
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284 struct cyg_devtab_entry *sub_tab,
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285 const char *name)
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286 {
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287 serial_channel *chan = (serial_channel *)(*tab)->priv;
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288 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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289 return ENOERR;
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290 }
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291
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292
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293
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294
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295
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296 // Send a character to the device output buffer.
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297 // Return 'true' if character is sent to device, return 'false' when
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298 // we've ran out of buffer space in the device itself.
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299 static bool pc_serial_putc(serial_channel *chan, unsigned char c)
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300 {
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301 int x = 0 ;
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302
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303 pc_serial_info * port = (pc_serial_info *)chan->dev_priv;
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304
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305 #if 0
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306 // Make sure the transmitter is empty.
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307 if ((pc_inb(port->base + LSR) & LSR_THE) == 0)
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308 return false ;
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309 #else
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310 // There isn't a status for FIFO "not full" from the '550, so we have to
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311 // keep track of it ourselves.
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312 if ((pc_inb(port->base + LSR) & LSR_THE) == 0)
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313 { if ((port->deviceType == s16550a) &&
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314 (port->charsInTransmitter++ < PC16550_FIFO_TX_LENGTH))
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315 { /* We're cool to keep sending characters. */
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316 }
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317 else
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318 return false ;
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319 }
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320 #endif
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321 pc_outb(port->base + THR, c);
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322
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323 return true ;
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324 }
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diff changeset
325
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diff changeset
326
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327
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328 // Fetch a character from the device input buffer, waiting if necessary
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329 static unsigned char pc_serial_getc(serial_channel *chan)
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330 {
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331 pc_serial_info * port = (pc_serial_info *)chan->dev_priv;
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332
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333 while ((pc_inb(port->base + LSR) & LSR_RSR) == 0)
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334 ;
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335
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336 return pc_inb(port->base + RHR) ;
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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337 }
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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diff changeset
338
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diff changeset
339
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diff changeset
340
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341 // Set up the device characteristics; baud rate, etc.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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342 static bool pc_serial_set_config(serial_channel *chan, cyg_serial_info_t *config)
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343 {
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344 return pc_serial_config_port(chan, config, false);
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345 }
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diff changeset
346
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diff changeset
347
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348
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349 // Enable the transmitter on the device
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350 static void pc_serial_start_xmit(serial_channel *chan)
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351 {
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352 pc_serial_info * port = (pc_serial_info *) chan->dev_priv;
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353 pc_outb(port->base + IER, port->_ier |= IER_XMT) ;
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354 }
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355
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diff changeset
356
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diff changeset
357
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358 // Disable the transmitter on the device
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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359 static void pc_serial_stop_xmit(serial_channel * chan)
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360 { pc_serial_info * port = (pc_serial_info *) chan->dev_priv;
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361 pc_outb(port->base + IER, port->_ier &= ~IER_XMT) ;
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362 }
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diff changeset
363
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diff changeset
364
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diff changeset
365
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366 // Serial I/O - low level interrupt handler (ISR)
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367 static cyg_uint32 pc_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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368 {
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369 serial_channel *chan = (serial_channel *) data;
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370 pc_serial_info * port = (pc_serial_info *) chan->dev_priv;
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371 cyg_drv_interrupt_mask(port->int_num);
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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372 cyg_drv_interrupt_acknowledge(port->int_num);
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373 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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374 }
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375
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376
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377
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378 // Serial I/O - high level interrupt handler (DSR)
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379 static void pc_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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380 {
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381 serial_channel *chan = (serial_channel *)data;
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382 pc_serial_info *port = (pc_serial_info *)chan->dev_priv;
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383 unsigned char isr;
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384 isr = pc_inb(port->base + ISR) & 0x0E;
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385 if (isr == ISR_Tx)
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386 { port->charsInTransmitter = 0 ;
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387 (chan->callbacks->xmt_char)(chan);
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388 } else if (isr == ISR_Rx)
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389 {
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390 // If we've got s16550a, then read all the characters in the fifo.
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391 while (pc_inb(port->base + LSR) & LSR_RSR)
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392 {
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393 char c = pc_inb(port->base + RHR);
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394 (chan->callbacks->rcv_char)(chan, c);
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395 }
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396 }
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397 cyg_drv_interrupt_unmask(port->int_num);
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398 }
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399 #endif