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annotate packages/devs/serial/arm/aeb/current/src/aeb_serial.c @ 82:6736c52df507 ecos-sw-2000-04-14

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Merge from eCos master repository on 2000-04-14-13:35:46-BST
author jlarmour
date Tue, 18 Apr 2000 21:51:55 +0000
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children 6ed91473a1cd
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1 //==========================================================================
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2 //
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3 // io/serial/arm/aeb_serial.c
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4 //
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5 // ARM AEB-1 Serial I/O Interface Module (interrupt driven)
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 1999-02-04
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37 // Purpose: AEB-1 Serial I/O module (interrupt driven version)
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38 // Description:
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39 //
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40 //####DESCRIPTIONEND####
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41 //
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42 //==========================================================================
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43
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44 #include <pkgconf/system.h>
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45 #include <pkgconf/io_serial.h>
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46 #include <pkgconf/io.h>
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47 #include <cyg/io/io.h>
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48 #include <cyg/hal/hal_intr.h>
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49 #include <cyg/io/devtab.h>
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50 #include <cyg/io/serial.h>
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51 #include <cyg/infra/diag.h>
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52
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53 #ifdef CYGPKG_IO_SERIAL_ARM_AEB
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54
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55 #include "aeb_serial.h"
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56
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57 typedef struct aeb_serial_info {
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58 CYG_ADDRWORD base;
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59 CYG_WORD int_num;
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60 cyg_interrupt serial_interrupt;
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61 cyg_handle_t serial_interrupt_handle;
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62 } aeb_serial_info;
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63
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64 static bool aeb_serial_init(struct cyg_devtab_entry *tab);
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65 static bool aeb_serial_putc(serial_channel *chan, unsigned char c);
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66 static Cyg_ErrNo aeb_serial_lookup(struct cyg_devtab_entry **tab,
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67 struct cyg_devtab_entry *sub_tab,
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68 const char *name);
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69 static unsigned char aeb_serial_getc(serial_channel *chan);
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70 static bool aeb_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);
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71 static void aeb_serial_start_xmit(serial_channel *chan);
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72 static void aeb_serial_stop_xmit(serial_channel *chan);
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73
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74 static cyg_uint32 aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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75 static void aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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76
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77 static SERIAL_FUNS(aeb_serial_funs,
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78 aeb_serial_putc,
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79 aeb_serial_getc,
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80 aeb_serial_set_config,
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81 aeb_serial_start_xmit,
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82 aeb_serial_stop_xmit
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83 );
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84
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85 #ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0
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86 static aeb_serial_info aeb_serial_info0 = {0xFFFF0000,
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87 CYGNUM_HAL_INTERRUPT_UART0};
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88 #if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE > 0
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89 static unsigned char aeb_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE];
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90 static unsigned char aeb_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE];
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91
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92 static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel0,
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93 aeb_serial_funs,
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94 aeb_serial_info0,
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95 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD),
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96 CYG_SERIAL_STOP_DEFAULT,
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97 CYG_SERIAL_PARITY_DEFAULT,
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98 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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99 CYG_SERIAL_FLAGS_DEFAULT,
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100 &aeb_serial_out_buf0[0], sizeof(aeb_serial_out_buf0),
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101 &aeb_serial_in_buf0[0], sizeof(aeb_serial_in_buf0)
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102 );
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103 #else
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104 static SERIAL_CHANNEL(aeb_serial_channel0,
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105 aeb_serial_funs,
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106 aeb_serial_info0,
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107 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD),
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108 CYG_SERIAL_STOP_DEFAULT,
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109 CYG_SERIAL_PARITY_DEFAULT,
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110 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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111 CYG_SERIAL_FLAGS_DEFAULT
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112 );
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113 #endif
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114
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115 DEVTAB_ENTRY(aeb_serial_io0,
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116 CYGDAT_IO_SERIAL_ARM_AEB_SERIAL0_NAME,
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117 0, // Does not depend on a lower level interface
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118 &cyg_io_serial_devio,
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119 aeb_serial_init,
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120 aeb_serial_lookup, // Serial driver may need initializing
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121 &aeb_serial_channel0
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122 );
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123 #endif // CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0
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124
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125 #ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1
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126 static aeb_serial_info aeb_serial_info1 = {0xFFFF0400,
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127 CYGNUM_HAL_INTERRUPT_UART1};
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128 #if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE > 0
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129 static unsigned char aeb_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE];
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130 static unsigned char aeb_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE];
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131
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132 static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel1,
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133 aeb_serial_funs,
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134 aeb_serial_info1,
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135 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD),
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136 CYG_SERIAL_STOP_DEFAULT,
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137 CYG_SERIAL_PARITY_DEFAULT,
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138 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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139 CYG_SERIAL_FLAGS_DEFAULT,
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140 &aeb_serial_out_buf1[0], sizeof(aeb_serial_out_buf1),
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141 &aeb_serial_in_buf1[0], sizeof(aeb_serial_in_buf1)
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142 );
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143 #else
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144 static SERIAL_CHANNEL(aeb_serial_channel1,
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145 aeb_serial_funs,
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146 aeb_serial_info1,
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147 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD),
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148 CYG_SERIAL_STOP_DEFAULT,
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149 CYG_SERIAL_PARITY_DEFAULT,
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150 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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151 CYG_SERIAL_FLAGS_DEFAULT
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152 );
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153 #endif
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154
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155 DEVTAB_ENTRY(aeb_serial_io1,
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156 CYGDAT_IO_SERIAL_ARM_AEB_SERIAL1_NAME,
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157 0, // Does not depend on a lower level interface
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158 &cyg_io_serial_devio,
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159 aeb_serial_init,
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160 aeb_serial_lookup, // Serial driver may need initializing
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161 &aeb_serial_channel1
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162 );
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163 #endif // CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1
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164
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165 // Internal function to actually configure the hardware to desired baud rate, etc.
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166 static bool
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167 aeb_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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168 {
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169 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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170 volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
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171 unsigned short baud_divisor = select_baud[new_config->baud];
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172 unsigned char _lcr, _ier;
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173 if (baud_divisor == 0) return false;
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174 _ier = port->REG_IER;
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175 port->REG_IER = 0; // Disable port interrupts while changing hardware
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176 _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
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177 select_stop_bits[new_config->stop] |
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178 select_parity[new_config->parity];
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179 port->REG_LCR = _lcr;
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180 port->REG_LCR |= LCR_DL;
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181 port->REG_MDL = baud_divisor >> 8;
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182 port->REG_LDL = baud_divisor & 0xFF;
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183 port->REG_LCR &= ~LCR_DL;
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184 if (init) {
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185 port->REG_FCR = 0x07; // Enable and clear FIFO
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186 if (chan->out_cbuf.len != 0) {
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187 port->REG_IER = IER_RCV;
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188 } else {
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189 port->REG_IER = 0;
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190 }
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191 port->REG_MCR = MCR_INT|MCR_DTR|MCR_RTS; // Master interrupt enable
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192 } else {
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193 port->REG_IER = _ier;
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194 }
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195 if (new_config != &chan->config) {
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196 chan->config = *new_config;
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197 }
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198 return true;
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199 }
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200
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201 // Function to initialize the device. Called at bootstrap time.
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202 static bool
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203 aeb_serial_init(struct cyg_devtab_entry *tab)
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204 {
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205 serial_channel *chan = (serial_channel *)tab->priv;
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206 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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207 #ifdef CYGDBG_IO_INIT
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208 diag_printf("AEB SERIAL init - dev: %x.%d\n", aeb_chan->base, aeb_chan->int_num);
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209 #endif
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210 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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211 if (chan->out_cbuf.len != 0) {
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212 cyg_drv_interrupt_create(aeb_chan->int_num,
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213 99, // Priority - unused
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214 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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215 aeb_serial_ISR,
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216 aeb_serial_DSR,
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217 &aeb_chan->serial_interrupt_handle,
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218 &aeb_chan->serial_interrupt);
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219 cyg_drv_interrupt_attach(aeb_chan->serial_interrupt_handle);
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220 cyg_drv_interrupt_unmask(aeb_chan->int_num);
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221 }
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222 aeb_serial_config_port(chan, &chan->config, true);
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223 return true;
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224 }
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225
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226 // This routine is called when the device is "looked" up (i.e. attached)
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227 static Cyg_ErrNo
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228 aeb_serial_lookup(struct cyg_devtab_entry **tab,
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229 struct cyg_devtab_entry *sub_tab,
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230 const char *name)
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231 {
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232 serial_channel *chan = (serial_channel *)(*tab)->priv;
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233 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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234 return ENOERR;
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235 }
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236
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237 // Send a character to the device output buffer.
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238 // Return 'true' if character is sent to device
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239 static bool
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240 aeb_serial_putc(serial_channel *chan, unsigned char c)
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241 {
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242 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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243 volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
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244 if (port->REG_LSR & LSR_THE) {
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245 // Transmit buffer is empty
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246 port->REG_THR = c;
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247 return true;
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248 } else {
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249 // No space
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250 return false;
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251 }
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252 }
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253
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254 // Fetch a character from the device input buffer, waiting if necessary
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255 static unsigned char
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256 aeb_serial_getc(serial_channel *chan)
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257 {
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258 unsigned char c;
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259 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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260 volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
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261 while ((port->REG_LSR & LSR_RSR) == 0) ; // Wait for char
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262 c = port->REG_RHR;
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263 return c;
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264 }
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265
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266 // Set up the device characteristics; baud rate, etc.
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267 static bool
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268 aeb_serial_set_config(serial_channel *chan, cyg_serial_info_t *config)
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269 {
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270 return aeb_serial_config_port(chan, config, false);
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271 }
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272
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273 // Enable the transmitter on the device
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274 static void
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275 aeb_serial_start_xmit(serial_channel *chan)
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276 {
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277 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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278 volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
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279 port->REG_IER |= IER_XMT; // Enable xmit interrupt
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280 }
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281
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282 // Disable the transmitter on the device
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283 static void
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284 aeb_serial_stop_xmit(serial_channel *chan)
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285 {
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286 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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287 volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
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288 port->REG_IER &= ~IER_XMT; // Disable xmit interrupt
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289 }
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290
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291 // Serial I/O - low level interrupt handler (ISR)
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292 static cyg_uint32
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293 aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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294 {
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295 serial_channel *chan = (serial_channel *)data;
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296 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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297 cyg_drv_interrupt_mask(aeb_chan->int_num);
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298 cyg_drv_interrupt_acknowledge(aeb_chan->int_num);
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299 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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300 }
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301
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302 // Serial I/O - high level interrupt handler (DSR)
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303 static void
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304 aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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305 {
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306 serial_channel *chan = (serial_channel *)data;
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307 aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
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308 volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
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309 unsigned char isr;
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310 isr = port->REG_ISR & 0x0E;
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311 if (isr == ISR_Tx) {
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312 (chan->callbacks->xmt_char)(chan);
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313 } else if (isr == ISR_Rx) {
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314 (chan->callbacks->rcv_char)(chan, port->REG_RHR);
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315 }
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316 cyg_drv_interrupt_unmask(aeb_chan->int_num);
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317 }
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318 #endif