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annotate packages/io/serial/current/src/arm/cma230_serial.c @ 62:7a6ac9edc838 ecos-sw-2000-01-24

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Merge from eCos master repository on 2000-01-24-19:43:49-GMT
author jlarmour
date Mon, 24 Jan 2000 21:43:17 +0000
parents 797268ecc331
children c38311975d4f
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1 //==========================================================================
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2 //
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3 // io/serial/arm/cma230_serial.c
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4 //
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5 // Cogent CMA230 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 Cygnus eCos Public License
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos
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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 Cygnus Operating System, released
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22 // September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Cygnus. Portions created
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved.
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26 // -------------------------------------------
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27 //
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28 //####COPYRIGHTEND####
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29 //==========================================================================
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30 //#####DESCRIPTIONBEGIN####
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31 //
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32 // Author(s): gthomas
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33 // Contributors: gthomas
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34 // Date: 1999-02-04
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35 // Purpose: CMA230 Serial I/O module (interrupt driven version)
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36 // Description:
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37 //
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38 //####DESCRIPTIONEND####
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39 //
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40 //==========================================================================
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41
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42 #include <pkgconf/system.h>
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43 #include <pkgconf/io_serial.h>
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44 #include <pkgconf/io.h>
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45 #include <cyg/io/io.h>
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46 #include <cyg/hal/hal_intr.h>
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47 #include <cyg/io/devtab.h>
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48 #include <cyg/io/serial.h>
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49 #include <cyg/hal/hal_cma230.h>
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50 #include <cyg/infra/diag.h>
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51
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52 #ifdef CYGPKG_IO_SERIAL_ARM_CMA230
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53
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54 #include "cma230_serial.h"
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55
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56 typedef struct cma230_serial_info {
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57 CYG_ADDRWORD base;
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58 CYG_WORD int_num;
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59 cyg_interrupt serial_interrupt;
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60 cyg_handle_t serial_interrupt_handle;
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61 } cma230_serial_info;
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62
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63 static bool cma230_serial_init(struct cyg_devtab_entry *tab);
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64 static bool cma230_serial_putc(serial_channel *chan, unsigned char c);
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65 static Cyg_ErrNo cma230_serial_lookup(struct cyg_devtab_entry **tab,
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66 struct cyg_devtab_entry *sub_tab,
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67 const char *name);
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68 static unsigned char cma230_serial_getc(serial_channel *chan);
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69 static bool cma230_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);
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70 static void cma230_serial_start_xmit(serial_channel *chan);
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71 static void cma230_serial_stop_xmit(serial_channel *chan);
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72
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73 static cyg_uint32 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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74 static void cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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75
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76 static SERIAL_FUNS(cma230_serial_funs,
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77 cma230_serial_putc,
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78 cma230_serial_getc,
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79 cma230_serial_set_config,
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80 cma230_serial_start_xmit,
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81 cma230_serial_stop_xmit
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82 );
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83
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84 #ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A
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85 static cma230_serial_info cma230_serial_info0 = {CMA101_DUARTA,
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86 CYGNUM_HAL_INTERRUPT_SERIAL_A};
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87 #if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE > 0
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88 static unsigned char cma230_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];
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89 static unsigned char cma230_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];
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90
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91 static SERIAL_CHANNEL_USING_INTERRUPTS(cma230_serial_channel0,
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92 cma230_serial_funs,
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93 cma230_serial_info0,
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94 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),
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95 CYG_SERIAL_STOP_DEFAULT,
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96 CYG_SERIAL_PARITY_DEFAULT,
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97 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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98 CYG_SERIAL_FLAGS_DEFAULT,
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99 &cma230_serial_out_buf0[0], sizeof(cma230_serial_out_buf0),
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100 &cma230_serial_in_buf0[0], sizeof(cma230_serial_in_buf0)
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101 );
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102 #else
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103 static SERIAL_CHANNEL(cma230_serial_channel0,
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104 cma230_serial_funs,
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105 cma230_serial_info0,
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106 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),
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107 CYG_SERIAL_STOP_DEFAULT,
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108 CYG_SERIAL_PARITY_DEFAULT,
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109 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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110 CYG_SERIAL_FLAGS_DEFAULT
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111 );
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112 #endif
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113
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114 DEVTAB_ENTRY(cma230_serial_io0,
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115 CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_A_NAME,
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116 0, // Does not depend on a lower level interface
62
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117 &cyg_io_serial_devio,
46
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118 cma230_serial_init,
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119 cma230_serial_lookup, // Serial driver may need initializing
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120 &cma230_serial_channel0
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121 );
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122 #endif // CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A
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123
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124 #ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B
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125 static cma230_serial_info cma230_serial_info1 = {CMA101_DUARTB,
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126 CYGNUM_HAL_INTERRUPT_SERIAL_B};
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127 #if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE > 0
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128 static unsigned char cma230_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];
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129 static unsigned char cma230_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];
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130
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131 static SERIAL_CHANNEL_USING_INTERRUPTS(cma230_serial_channel1,
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132 cma230_serial_funs,
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133 cma230_serial_info1,
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134 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),
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135 CYG_SERIAL_STOP_DEFAULT,
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136 CYG_SERIAL_PARITY_DEFAULT,
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137 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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138 CYG_SERIAL_FLAGS_DEFAULT,
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139 &cma230_serial_out_buf1[0], sizeof(cma230_serial_out_buf1),
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140 &cma230_serial_in_buf1[0], sizeof(cma230_serial_in_buf1)
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141 );
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142 #else
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143 static SERIAL_CHANNEL(cma230_serial_channel1,
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144 cma230_serial_funs,
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145 cma230_serial_info1,
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146 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),
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147 CYG_SERIAL_STOP_DEFAULT,
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148 CYG_SERIAL_PARITY_DEFAULT,
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149 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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150 CYG_SERIAL_FLAGS_DEFAULT
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151 );
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152 #endif
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153
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154 DEVTAB_ENTRY(cma230_serial_io1,
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155 CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_B_NAME,
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156 0, // Does not depend on a lower level interface
62
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157 &cyg_io_serial_devio,
46
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158 cma230_serial_init,
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159 cma230_serial_lookup, // Serial driver may need initializing
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160 &cma230_serial_channel1
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161 );
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162 #endif // CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B
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163
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164 // Internal function to actually configure the hardware to desired baud rate, etc.
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165 static bool
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166 cma230_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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167 {
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168 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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169 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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170 unsigned short baud_divisor = select_baud[new_config->baud];
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171 unsigned char _lcr, _ier;
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172 if (baud_divisor == 0) return false; // Invalid configuration
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173 _ier = port->ier;
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174 port->ier = 0; // Disable port interrupts while changing hardware
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175 _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
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176 select_stop_bits[new_config->stop] |
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177 select_parity[new_config->parity];
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178 port->lcr = _lcr;
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179 port->lcr |= LCR_DL;
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180 port->mdl = baud_divisor >> 8;
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181 port->ldl = baud_divisor & 0xFF;
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182 port->lcr &= ~LCR_DL;
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183 if (init) {
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184 port->fcr = 0x07; // Enable and clear FIFO
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185 if (chan->out_cbuf.len != 0) {
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186 port->ier = IER_RCV;
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187 } else {
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188 port->ier = 0;
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189 }
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190 port->mcr = MCR_INT|MCR_DTR|MCR_RTS; // Master interrupt enable
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191 } else {
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192 port->ier = _ier;
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193 }
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194 if (new_config != &chan->config) {
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195 chan->config = *new_config;
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196 }
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197 return true;
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198 }
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199
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200 // Function to initialize the device. Called at bootstrap time.
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201 static bool
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202 cma230_serial_init(struct cyg_devtab_entry *tab)
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203 {
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204 serial_channel *chan = (serial_channel *)tab->priv;
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205 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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206 #ifdef CYGDBG_IO_INIT
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207 diag_printf("CMA230 SERIAL init - dev: %x.%d\n", cma230_chan->base, cma230_chan->int_num);
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208 #endif
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209 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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210 if (chan->out_cbuf.len != 0) {
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211 cyg_drv_interrupt_create(cma230_chan->int_num,
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212 99, // Priority - what goes here?
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213 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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214 cma230_serial_ISR,
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215 cma230_serial_DSR,
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216 &cma230_chan->serial_interrupt_handle,
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217 &cma230_chan->serial_interrupt);
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218 cyg_drv_interrupt_attach(cma230_chan->serial_interrupt_handle);
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219 cyg_drv_interrupt_unmask(cma230_chan->int_num);
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220 }
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221 cma230_serial_config_port(chan, &chan->config, true);
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222 return true;
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223 }
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224
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225 // This routine is called when the device is "looked" up (i.e. attached)
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226 static Cyg_ErrNo
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227 cma230_serial_lookup(struct cyg_devtab_entry **tab,
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228 struct cyg_devtab_entry *sub_tab,
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229 const char *name)
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230 {
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231 serial_channel *chan = (serial_channel *)(*tab)->priv;
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232 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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233 return ENOERR;
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234 }
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235
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236 // Send a character to the device output buffer.
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237 // Return 'true' if character is sent to device
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238 static bool
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239 cma230_serial_putc(serial_channel *chan, unsigned char c)
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240 {
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241 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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242 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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243 if (port->lsr & LSR_THE) {
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244 // Transmit buffer is empty
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245 port->thr = c;
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246 return true;
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247 } else {
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248 // No space
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249 return false;
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250 }
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251 }
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252
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253 // Fetch a character from the device input buffer, waiting if necessary
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254 static unsigned char
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255 cma230_serial_getc(serial_channel *chan)
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256 {
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257 unsigned char c;
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258 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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259 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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260 while ((port->lsr & LSR_RSR) == 0) ; // Wait for char
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261 c = port->rhr;
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262 return c;
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263 }
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264
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265 // Set up the device characteristics; baud rate, etc.
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266 static bool
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267 cma230_serial_set_config(serial_channel *chan, cyg_serial_info_t *config)
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268 {
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269 return cma230_serial_config_port(chan, config, false);
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270 }
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271
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272 // Enable the transmitter on the device
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273 static void
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274 cma230_serial_start_xmit(serial_channel *chan)
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275 {
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276 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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277 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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278 port->ier |= IER_XMT; // Enable xmit interrupt
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279 }
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280
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281 // Disable the transmitter on the device
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282 static void
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283 cma230_serial_stop_xmit(serial_channel *chan)
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284 {
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285 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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286 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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287 port->ier &= ~IER_XMT; // Disable xmit interrupt
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288 }
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289
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290 // Serial I/O - low level interrupt handler (ISR)
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291 static cyg_uint32
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292 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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293 {
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294 serial_channel *chan = (serial_channel *)data;
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295 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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296 cyg_drv_interrupt_mask(cma230_chan->int_num);
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297 cyg_drv_interrupt_acknowledge(cma230_chan->int_num);
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298 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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299 }
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300
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301 // Serial I/O - high level interrupt handler (DSR)
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302 static void
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303 cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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304 {
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305 serial_channel *chan = (serial_channel *)data;
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306 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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307 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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308 unsigned char isr;
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309 isr = port->isr & 0x0E;
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310 if (isr == ISR_Tx) {
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311 (chan->callbacks->xmt_char)(chan);
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312 } else if (isr == ISR_Rx) {
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313 (chan->callbacks->rcv_char)(chan, port->rhr);
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314 }
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315 cyg_drv_interrupt_unmask(cma230_chan->int_num);
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316 }
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317 #endif