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annotate packages/devs/serial/arm/pid/current/src/pid_serial_with_ints.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
parents
children c37d3a9e1b28
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1 //==========================================================================
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2 //
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3 // io/serial/arm/pid_serial_with_ints.c
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4 //
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5 // ARM PID 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: PID 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_PID
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54 #include "pid_serial.h"
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55
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56 typedef struct pid_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 } pid_serial_info;
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62
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63 static bool pid_serial_init(struct cyg_devtab_entry *tab);
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64 static bool pid_serial_putc(serial_channel *chan, unsigned char c);
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65 static Cyg_ErrNo pid_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 pid_serial_getc(serial_channel *chan);
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69 static bool pid_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);
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70 static void pid_serial_start_xmit(serial_channel *chan);
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71 static void pid_serial_stop_xmit(serial_channel *chan);
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72
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73 static cyg_uint32 pid_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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74 static void pid_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(pid_serial_funs,
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77 pid_serial_putc,
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78 pid_serial_getc,
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79 pid_serial_set_config,
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80 pid_serial_start_xmit,
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81 pid_serial_stop_xmit
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82 );
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83
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84 #ifdef CYGPKG_IO_SERIAL_ARM_PID_SERIAL0
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85 static pid_serial_info pid_serial_info0 = {0x0D800000, CYGNUM_HAL_INTERRUPT_SERIALA};
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86 #if CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BUFSIZE > 0
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87 static unsigned char pid_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BUFSIZE];
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88 static unsigned char pid_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BUFSIZE];
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89
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90 static SERIAL_CHANNEL_USING_INTERRUPTS(pid_serial_channel0,
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91 pid_serial_funs,
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92 pid_serial_info0,
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93 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BAUD),
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94 CYG_SERIAL_STOP_DEFAULT,
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95 CYG_SERIAL_PARITY_DEFAULT,
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96 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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97 CYG_SERIAL_FLAGS_DEFAULT,
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98 &pid_serial_out_buf0[0], sizeof(pid_serial_out_buf0),
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99 &pid_serial_in_buf0[0], sizeof(pid_serial_in_buf0)
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100 );
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101 #else
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102 static SERIAL_CHANNEL(pid_serial_channel0,
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103 pid_serial_funs,
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104 pid_serial_info0,
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105 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BAUD),
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106 CYG_SERIAL_STOP_DEFAULT,
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107 CYG_SERIAL_PARITY_DEFAULT,
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108 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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109 CYG_SERIAL_FLAGS_DEFAULT
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110 );
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111 #endif
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112
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113 DEVTAB_ENTRY(pid_serial_io0,
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114 CYGDAT_IO_SERIAL_ARM_PID_SERIAL0_NAME,
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115 0, // Does not depend on a lower level interface
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116 &cyg_io_serial_devio,
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117 pid_serial_init,
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118 pid_serial_lookup, // Serial driver may need initializing
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119 &pid_serial_channel0
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120 );
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121 #endif // CYGPKG_IO_SERIAL_ARM_PID_SERIAL0
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122
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123 #ifdef CYGPKG_IO_SERIAL_ARM_PID_SERIAL1
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124 static pid_serial_info pid_serial_info1 = {0x0D800020, CYGNUM_HAL_INTERRUPT_SERIALB};
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125 #if CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BUFSIZE > 0
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126 static unsigned char pid_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BUFSIZE];
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127 static unsigned char pid_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BUFSIZE];
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128
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129 static SERIAL_CHANNEL_USING_INTERRUPTS(pid_serial_channel1,
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130 pid_serial_funs,
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131 pid_serial_info1,
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132 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BAUD),
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133 CYG_SERIAL_STOP_DEFAULT,
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134 CYG_SERIAL_PARITY_DEFAULT,
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135 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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136 CYG_SERIAL_FLAGS_DEFAULT,
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137 &pid_serial_out_buf1[0], sizeof(pid_serial_out_buf1),
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138 &pid_serial_in_buf1[0], sizeof(pid_serial_in_buf1)
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139 );
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140 #else
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141 static SERIAL_CHANNEL(pid_serial_channel1,
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142 pid_serial_funs,
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143 pid_serial_info1,
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144 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_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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148 CYG_SERIAL_FLAGS_DEFAULT
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149 );
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150 #endif
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151
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152 DEVTAB_ENTRY(pid_serial_io1,
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153 CYGDAT_IO_SERIAL_ARM_PID_SERIAL1_NAME,
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154 0, // Does not depend on a lower level interface
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155 &cyg_io_serial_devio,
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156 pid_serial_init,
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157 pid_serial_lookup, // Serial driver may need initializing
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158 &pid_serial_channel1
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159 );
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160 #endif // CYGPKG_IO_SERIAL_ARM_PID_SERIAL1
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161
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162 // Internal function to actually configure the hardware to desired baud rate, etc.
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163 static bool
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164 pid_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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165 {
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166 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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167 volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;
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168 unsigned short baud_divisor = select_baud[new_config->baud];
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169 unsigned char _lcr, _ier;
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170 if (baud_divisor == 0) return false; // Invalid configuration
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171 _ier = port->ier;
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172 port->ier = 0; // Disable port interrupts while changing hardware
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173 _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
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174 select_stop_bits[new_config->stop] |
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175 select_parity[new_config->parity];
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176 port->lcr = _lcr;
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177 port->lcr |= LCR_DL;
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178 port->mdl = baud_divisor >> 8;
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179 port->ldl = baud_divisor & 0xFF;
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180 port->lcr &= ~LCR_DL;
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181 if (init) {
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182 port->fcr = 0x07; // Enable and clear FIFO
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183 if (chan->out_cbuf.len != 0) {
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184 port->ier = IER_RCV;
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185 } else {
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186 port->ier = 0;
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187 }
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188 port->mcr = MCR_INT|MCR_DTR|MCR_RTS; // Master interrupt enable
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189 } else {
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190 port->ier = _ier;
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191 }
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192 if (new_config != &chan->config) {
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193 chan->config = *new_config;
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194 }
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195 return true;
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196 }
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197
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198 // Function to initialize the device. Called at bootstrap time.
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199 static bool
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200 pid_serial_init(struct cyg_devtab_entry *tab)
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201 {
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202 serial_channel *chan = (serial_channel *)tab->priv;
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203 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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204 #ifdef CYGDBG_IO_INIT
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205 diag_printf("PID SERIAL init - dev: %x.%d\n", pid_chan->base, pid_chan->int_num);
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206 #endif
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207 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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208 if (chan->out_cbuf.len != 0) {
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209 cyg_drv_interrupt_create(pid_chan->int_num,
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210 99, // Priority - what goes here?
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211 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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212 pid_serial_ISR,
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213 pid_serial_DSR,
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214 &pid_chan->serial_interrupt_handle,
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215 &pid_chan->serial_interrupt);
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216 cyg_drv_interrupt_attach(pid_chan->serial_interrupt_handle);
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217 cyg_drv_interrupt_unmask(pid_chan->int_num);
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218 }
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219 pid_serial_config_port(chan, &chan->config, true);
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220 return true;
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221 }
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222
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223 // This routine is called when the device is "looked" up (i.e. attached)
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224 static Cyg_ErrNo
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225 pid_serial_lookup(struct cyg_devtab_entry **tab,
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226 struct cyg_devtab_entry *sub_tab,
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227 const char *name)
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228 {
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229 serial_channel *chan = (serial_channel *)(*tab)->priv;
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230 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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231 return ENOERR;
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232 }
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233
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234 // Send a character to the device output buffer.
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235 // Return 'true' if character is sent to device
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236 static bool
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237 pid_serial_putc(serial_channel *chan, unsigned char c)
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238 {
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239 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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240 volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;
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241 if (port->lsr & LSR_THE) {
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242 // Transmit buffer is empty
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243 port->thr = c;
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244 return true;
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245 } else {
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246 // No space
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247 return false;
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248 }
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249 }
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250
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251 // Fetch a character from the device input buffer, waiting if necessary
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252 static unsigned char
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253 pid_serial_getc(serial_channel *chan)
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254 {
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255 unsigned char c;
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256 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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257 volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;
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258 while ((port->lsr & LSR_RSR) == 0) ; // Wait for char
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259 c = port->rhr;
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260 return c;
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261 }
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262
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263 // Set up the device characteristics; baud rate, etc.
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264 static bool
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265 pid_serial_set_config(serial_channel *chan, cyg_serial_info_t *config)
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266 {
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267 return pid_serial_config_port(chan, config, false);
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268 }
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269
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270 // Enable the transmitter on the device
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271 static void
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272 pid_serial_start_xmit(serial_channel *chan)
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273 {
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274 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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275 volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;
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276 port->ier |= IER_XMT; // Enable xmit interrupt
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277 }
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278
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279 // Disable the transmitter on the device
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280 static void
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281 pid_serial_stop_xmit(serial_channel *chan)
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282 {
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283 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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284 volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;
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285 port->ier &= ~IER_XMT; // Disable xmit interrupt
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286 }
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287
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288 // Serial I/O - low level interrupt handler (ISR)
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289 static cyg_uint32
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290 pid_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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291 {
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292 serial_channel *chan = (serial_channel *)data;
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293 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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294 cyg_drv_interrupt_mask(pid_chan->int_num);
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295 cyg_drv_interrupt_acknowledge(pid_chan->int_num);
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296 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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297 }
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298
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299 // Serial I/O - high level interrupt handler (DSR)
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300 static void
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301 pid_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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302 {
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303 serial_channel *chan = (serial_channel *)data;
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304 pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;
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305 volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;
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306 unsigned char isr;
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307 while ((isr = port->isr & 0x0E) != 0) {
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308 if (isr == ISR_Tx) {
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309 (chan->callbacks->xmt_char)(chan);
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310 } else if (isr == ISR_RxTO) {
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311 (chan->callbacks->rcv_char)(chan, port->rhr);
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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 }
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316 cyg_drv_interrupt_unmask(pid_chan->int_num);
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317 }
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318 #endif