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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 74dbf4c3f2e1
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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 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas
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45 // Date: 1999-02-04
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46 // Purpose: CMA230 Serial I/O module (interrupt driven version)
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47 // Description:
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //==========================================================================
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52
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53 #include <pkgconf/system.h>
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54 #include <pkgconf/io_serial.h>
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55 #include <pkgconf/io.h>
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56 #include <cyg/io/io.h>
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57 #include <cyg/hal/hal_intr.h>
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58 #include <cyg/io/devtab.h>
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59 #include <cyg/io/serial.h>
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60 #include <cyg/hal/hal_cma230.h>
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61 #include <cyg/infra/diag.h>
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62
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63 #ifdef CYGPKG_IO_SERIAL_ARM_CMA230
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64
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65 #include "cma230_serial.h"
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66
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67 typedef struct cma230_serial_info {
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68 CYG_ADDRWORD base;
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69 CYG_WORD int_num;
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70 cyg_interrupt serial_interrupt;
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71 cyg_handle_t serial_interrupt_handle;
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72 } cma230_serial_info;
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73
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74 static bool cma230_serial_init(struct cyg_devtab_entry *tab);
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75 static bool cma230_serial_putc(serial_channel *chan, unsigned char c);
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76 static Cyg_ErrNo cma230_serial_lookup(struct cyg_devtab_entry **tab,
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77 struct cyg_devtab_entry *sub_tab,
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78 const char *name);
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79 static unsigned char cma230_serial_getc(serial_channel *chan);
115
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80 static Cyg_ErrNo cma230_serial_set_config(serial_channel *chan, cyg_uint32 key,
130
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81 const void *xbuf, cyg_uint32 *len);
82
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82 static void cma230_serial_start_xmit(serial_channel *chan);
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83 static void cma230_serial_stop_xmit(serial_channel *chan);
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84
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85 static cyg_uint32 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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86 static void cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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87
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88 static SERIAL_FUNS(cma230_serial_funs,
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89 cma230_serial_putc,
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90 cma230_serial_getc,
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91 cma230_serial_set_config,
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92 cma230_serial_start_xmit,
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93 cma230_serial_stop_xmit
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94 );
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95
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96 #ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A
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97 static cma230_serial_info cma230_serial_info0 = {CMA101_DUARTA,
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98 CYGNUM_HAL_INTERRUPT_SERIAL_A};
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99 #if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE > 0
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100 static unsigned char cma230_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];
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101 static unsigned char cma230_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];
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102
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103 static SERIAL_CHANNEL_USING_INTERRUPTS(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 &cma230_serial_out_buf0[0], sizeof(cma230_serial_out_buf0),
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112 &cma230_serial_in_buf0[0], sizeof(cma230_serial_in_buf0)
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113 );
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114 #else
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115 static SERIAL_CHANNEL(cma230_serial_channel0,
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116 cma230_serial_funs,
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117 cma230_serial_info0,
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118 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),
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119 CYG_SERIAL_STOP_DEFAULT,
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120 CYG_SERIAL_PARITY_DEFAULT,
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121 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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122 CYG_SERIAL_FLAGS_DEFAULT
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123 );
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124 #endif
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125
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126 DEVTAB_ENTRY(cma230_serial_io0,
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127 CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_A_NAME,
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128 0, // Does not depend on a lower level interface
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129 &cyg_io_serial_devio,
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130 cma230_serial_init,
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131 cma230_serial_lookup, // Serial driver may need initializing
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132 &cma230_serial_channel0
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133 );
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134 #endif // CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A
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135
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136 #ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B
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137 static cma230_serial_info cma230_serial_info1 = {CMA101_DUARTB,
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138 CYGNUM_HAL_INTERRUPT_SERIAL_B};
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139 #if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE > 0
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140 static unsigned char cma230_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];
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141 static unsigned char cma230_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];
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142
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143 static SERIAL_CHANNEL_USING_INTERRUPTS(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 &cma230_serial_out_buf1[0], sizeof(cma230_serial_out_buf1),
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152 &cma230_serial_in_buf1[0], sizeof(cma230_serial_in_buf1)
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153 );
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154 #else
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155 static SERIAL_CHANNEL(cma230_serial_channel1,
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156 cma230_serial_funs,
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157 cma230_serial_info1,
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158 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),
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159 CYG_SERIAL_STOP_DEFAULT,
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160 CYG_SERIAL_PARITY_DEFAULT,
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161 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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162 CYG_SERIAL_FLAGS_DEFAULT
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163 );
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164 #endif
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165
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166 DEVTAB_ENTRY(cma230_serial_io1,
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167 CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_B_NAME,
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168 0, // Does not depend on a lower level interface
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169 &cyg_io_serial_devio,
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170 cma230_serial_init,
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171 cma230_serial_lookup, // Serial driver may need initializing
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172 &cma230_serial_channel1
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173 );
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174 #endif // CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B
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175
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176 // Internal function to actually configure the hardware to desired baud rate, etc.
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177 static bool
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178 cma230_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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179 {
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180 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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181 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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182 unsigned short baud_divisor = select_baud[new_config->baud];
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183 unsigned char _lcr, _ier;
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184 if (baud_divisor == 0) return false; // Invalid configuration
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185 _ier = port->ier;
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186 port->ier = 0; // Disable port interrupts while changing hardware
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187 _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
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188 select_stop_bits[new_config->stop] |
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189 select_parity[new_config->parity];
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190 port->lcr = _lcr;
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191 port->lcr |= LCR_DL;
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192 port->mdl = baud_divisor >> 8;
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193 port->ldl = baud_divisor & 0xFF;
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194 port->lcr &= ~LCR_DL;
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195 if (init) {
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196 port->fcr = 0x07; // Enable and clear FIFO
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197 if (chan->out_cbuf.len != 0) {
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198 port->ier = IER_RCV;
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199 } else {
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200 port->ier = 0;
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201 }
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202 port->mcr = MCR_INT|MCR_DTR|MCR_RTS; // Master interrupt enable
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203 } else {
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204 port->ier = _ier;
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205 }
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206 if (new_config != &chan->config) {
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207 chan->config = *new_config;
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208 }
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209 return true;
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210 }
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211
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212 // Function to initialize the device. Called at bootstrap time.
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213 static bool
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214 cma230_serial_init(struct cyg_devtab_entry *tab)
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215 {
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216 serial_channel *chan = (serial_channel *)tab->priv;
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217 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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218 #ifdef CYGDBG_IO_INIT
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219 diag_printf("CMA230 SERIAL init - dev: %x.%d\n", cma230_chan->base, cma230_chan->int_num);
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220 #endif
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221 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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222 if (chan->out_cbuf.len != 0) {
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223 cyg_drv_interrupt_create(cma230_chan->int_num,
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224 99, // Priority - what goes here?
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225 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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226 cma230_serial_ISR,
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227 cma230_serial_DSR,
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228 &cma230_chan->serial_interrupt_handle,
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229 &cma230_chan->serial_interrupt);
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230 cyg_drv_interrupt_attach(cma230_chan->serial_interrupt_handle);
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231 cyg_drv_interrupt_unmask(cma230_chan->int_num);
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232 }
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233 cma230_serial_config_port(chan, &chan->config, true);
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234 return true;
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235 }
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236
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237 // This routine is called when the device is "looked" up (i.e. attached)
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238 static Cyg_ErrNo
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239 cma230_serial_lookup(struct cyg_devtab_entry **tab,
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240 struct cyg_devtab_entry *sub_tab,
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241 const char *name)
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242 {
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243 serial_channel *chan = (serial_channel *)(*tab)->priv;
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244 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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245 return ENOERR;
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246 }
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247
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248 // Send a character to the device output buffer.
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249 // Return 'true' if character is sent to device
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250 static bool
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251 cma230_serial_putc(serial_channel *chan, unsigned char c)
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252 {
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253 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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254 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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255 if (port->lsr & LSR_THE) {
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256 // Transmit buffer is empty
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257 port->thr = c;
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258 return true;
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259 } else {
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260 // No space
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261 return false;
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262 }
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263 }
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264
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265 // Fetch a character from the device input buffer, waiting if necessary
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266 static unsigned char
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267 cma230_serial_getc(serial_channel *chan)
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268 {
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269 unsigned char c;
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270 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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271 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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272 while ((port->lsr & LSR_RSR) == 0) ; // Wait for char
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273 c = port->rhr;
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274 return c;
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275 }
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276
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277 // Set up the device characteristics; baud rate, etc.
115
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278 static Cyg_ErrNo
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279 cma230_serial_set_config(serial_channel *chan, cyg_uint32 key,
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280 const void *xbuf, cyg_uint32 *len)
82
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281 {
115
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282 switch (key) {
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283 case CYG_IO_SET_CONFIG_SERIAL_INFO:
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284 {
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285 cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
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286 if ( *len < sizeof(cyg_serial_info_t) ) {
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287 return -EINVAL;
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288 }
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289 *len = sizeof(cyg_serial_info_t);
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290 if ( true != cma230_serial_config_port(chan, config, false) )
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291 return -EINVAL;
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292 }
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293 break;
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294 default:
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295 return -EINVAL;
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296 }
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297 return ENOERR;
82
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298 }
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299
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300 // Enable the transmitter on the device
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301 static void
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302 cma230_serial_start_xmit(serial_channel *chan)
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303 {
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304 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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305 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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306 port->ier |= IER_XMT; // Enable xmit interrupt
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307 }
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308
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309 // Disable the transmitter on the device
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310 static void
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311 cma230_serial_stop_xmit(serial_channel *chan)
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312 {
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313 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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314 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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315 port->ier &= ~IER_XMT; // Disable xmit interrupt
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316 }
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317
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318 // Serial I/O - low level interrupt handler (ISR)
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319 static cyg_uint32
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320 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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321 {
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322 serial_channel *chan = (serial_channel *)data;
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323 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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324 cyg_drv_interrupt_mask(cma230_chan->int_num);
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325 cyg_drv_interrupt_acknowledge(cma230_chan->int_num);
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326 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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327 }
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328
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329 // Serial I/O - high level interrupt handler (DSR)
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330 static void
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331 cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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332 {
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333 serial_channel *chan = (serial_channel *)data;
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334 cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
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335 volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
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336 unsigned char isr;
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337 isr = port->isr & 0x0E;
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338 if (isr == ISR_Tx) {
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339 (chan->callbacks->xmt_char)(chan);
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340 } else if (isr == ISR_Rx) {
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341 (chan->callbacks->rcv_char)(chan, port->rhr);
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342 }
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343 cyg_drv_interrupt_unmask(cma230_chan->int_num);
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344 }
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345 #endif