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annotate packages/devs/serial/arm/aaed2000/current/src/aaed2000_serial.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // io/serial/arm/aaed2000_serial.c
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4 //
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5 // Agilent AAED2000 Serial I/O Interface Module (interrupt driven)
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6 //
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7 //==========================================================================
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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
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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, jskov
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44 // Contributors:gthomas, jskov
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45 // Date: 2001-11-12
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46 // Purpose: AAED2000 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> // interrupt
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58 #include <cyg/hal/hal_io.h> // register base
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59 #include <cyg/io/devtab.h>
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60 #include <cyg/io/serial.h>
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61 #include <cyg/infra/diag.h>
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62
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63 #include "aaed2000_serial.h"
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64
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65 typedef struct aaed2000_serial_info {
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66 CYG_ADDRWORD base;
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67 CYG_WORD int_num;
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68 cyg_interrupt serial_interrupt;
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69 cyg_handle_t serial_interrupt_handle;
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70 } aaed2000_serial_info;
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71
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72 static bool aaed2000_serial_init(struct cyg_devtab_entry *tab);
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73 static bool aaed2000_serial_putc(serial_channel *chan, unsigned char c);
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74 static Cyg_ErrNo aaed2000_serial_lookup(struct cyg_devtab_entry **tab,
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75 struct cyg_devtab_entry *sub_tab,
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76 const char *name);
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77 static unsigned char aaed2000_serial_getc(serial_channel *chan);
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78 static Cyg_ErrNo aaed2000_serial_set_config(serial_channel *chan,
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79 cyg_uint32 key,
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80 const void *xbuf, cyg_uint32 *len);
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81 static void aaed2000_serial_start_xmit(serial_channel *chan);
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82 static void aaed2000_serial_stop_xmit(serial_channel *chan);
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83
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84 static cyg_uint32 aaed2000_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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85 static void aaed2000_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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86
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87 static SERIAL_FUNS(aaed2000_serial_funs,
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88 aaed2000_serial_putc,
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89 aaed2000_serial_getc,
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90 aaed2000_serial_set_config,
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91 aaed2000_serial_start_xmit,
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92 aaed2000_serial_stop_xmit
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93 );
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94
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95 #ifdef CYGPKG_IO_SERIAL_ARM_AAED2000_SERIAL0
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96 static aaed2000_serial_info aaed2000_serial_info0 = {0x80000800,
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97 CYGNUM_HAL_INTERRUPT_UART3INTR};
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98 #if CYGNUM_IO_SERIAL_ARM_AAED2000_SERIAL0_BUFSIZE > 0
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99 static unsigned char aaed2000_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_AAED2000_SERIAL0_BUFSIZE];
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100 static unsigned char aaed2000_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_AAED2000_SERIAL0_BUFSIZE];
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101
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102 static SERIAL_CHANNEL_USING_INTERRUPTS(aaed2000_serial_channel0,
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103 aaed2000_serial_funs,
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104 aaed2000_serial_info0,
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105 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AAED2000_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 &aaed2000_serial_out_buf0[0], sizeof(aaed2000_serial_out_buf0),
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111 &aaed2000_serial_in_buf0[0], sizeof(aaed2000_serial_in_buf0)
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112 );
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113 #else
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114 static SERIAL_CHANNEL(aaed2000_serial_channel0,
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115 aaed2000_serial_funs,
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116 aaed2000_serial_info0,
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117 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AAED2000_SERIAL0_BAUD),
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118 CYG_SERIAL_STOP_DEFAULT,
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119 CYG_SERIAL_PARITY_DEFAULT,
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120 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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121 CYG_SERIAL_FLAGS_DEFAULT
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122 );
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123 #endif
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124
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125 DEVTAB_ENTRY(aaed2000_serial_io0,
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126 CYGDAT_IO_SERIAL_ARM_AAED2000_SERIAL0_NAME,
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127 0, // Does not depend on a lower level interface
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128 &cyg_io_serial_devio,
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129 aaed2000_serial_init,
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130 aaed2000_serial_lookup, // Serial driver may need initializing
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131 &aaed2000_serial_channel0
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132 );
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133 #endif // CYGPKG_IO_SERIAL_ARM_AAED2000_SERIAL0
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134
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135 // Internal function to actually configure the hardware to desired baud rate, etc.
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136 static bool
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137 aaed2000_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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138 {
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139 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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140 CYG_ADDRWORD base = aaed2000_chan->base;
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141 unsigned short baud_divisor = select_baud[new_config->baud];
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142 cyg_uint32 _lcr, _intm;
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143 if (baud_divisor == 0) return false;
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144
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145 // Register writes don't take effect till the UART is enabled.
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146 HAL_WRITE_UINT32(base+AAEC_UART_CTRL, AAEC_UART_CTRL_ENAB);
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147
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148 // Disable port interrupts while changing hardware
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149 HAL_READ_UINT32(base+AAEC_UART_INTM, _intm);
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150 HAL_WRITE_UINT32(base+AAEC_UART_INTM, 0);
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151
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152 _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
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153 select_stop_bits[new_config->stop] |
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154 select_parity[new_config->parity];
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155 HAL_WRITE_UINT32(base+AAEC_UART_BAUD, baud_divisor);
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156 if (init) {
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157 _lcr |= AAEC_UART_LCR_FIFO; // Enable FIFO
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158 if (chan->out_cbuf.len != 0) {
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159 _intm = AAEC_UART_INT_RIS|AAEC_UART_INT_RTIS;
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160 } else {
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161 _intm = 0;
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162 }
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163 }
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164 if (new_config != &chan->config) {
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165 chan->config = *new_config;
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166 }
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167
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168 // Set line control and (re)enable interrupts
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169 HAL_WRITE_UINT32(base+AAEC_UART_LCR, _lcr);
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170 HAL_WRITE_UINT32(base+AAEC_UART_INTM, _intm);
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171
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172 return true;
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173 }
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174
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175 // Function to initialize the device. Called at bootstrap time.
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176 static bool
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177 aaed2000_serial_init(struct cyg_devtab_entry *tab)
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178 {
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179 serial_channel *chan = (serial_channel *)tab->priv;
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180 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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181 #ifdef CYGDBG_IO_INIT
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182 diag_printf("AAED2000 SERIAL init - dev: 0x%08x.%d\n",
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183 aaed2000_chan->base, aaed2000_chan->int_num);
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184 #endif
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185 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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186 if (chan->out_cbuf.len != 0) {
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187 cyg_drv_interrupt_create(aaed2000_chan->int_num,
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188 1, // Priority - unused
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189 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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190 aaed2000_serial_ISR,
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191 aaed2000_serial_DSR,
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192 &aaed2000_chan->serial_interrupt_handle,
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193 &aaed2000_chan->serial_interrupt);
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194 cyg_drv_interrupt_attach(aaed2000_chan->serial_interrupt_handle);
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195 cyg_drv_interrupt_unmask(aaed2000_chan->int_num);
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196 }
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197 aaed2000_serial_config_port(chan, &chan->config, true);
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198 return true;
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199 }
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200
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201 // This routine is called when the device is "looked" up (i.e. attached)
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202 static Cyg_ErrNo
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203 aaed2000_serial_lookup(struct cyg_devtab_entry **tab,
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204 struct cyg_devtab_entry *sub_tab,
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205 const char *name)
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206 {
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207 serial_channel *chan = (serial_channel *)(*tab)->priv;
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208 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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209 return ENOERR;
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210 }
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211
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212 // Send a character to the device output buffer.
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213 // Return 'true' if character is sent to device
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214 static bool
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215 aaed2000_serial_putc(serial_channel *chan, unsigned char c)
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216 {
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217 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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218 CYG_ADDRWORD base = aaed2000_chan->base;
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219 cyg_uint32 _status;
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220
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221 HAL_READ_UINT32(base+AAEC_UART_STATUS, _status);
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222 if (_status & AAEC_UART_STATUS_TxFF) {
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223 // No space
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224 return false;
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225 } else {
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226 // Transmit buffer is empty
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227 HAL_WRITE_UINT32(base+AAEC_UART_DATA, (cyg_uint32)c);
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228 return true;
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229 }
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230 }
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231
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232 // Fetch a character from the device input buffer, waiting if necessary
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233 static unsigned char
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234 aaed2000_serial_getc(serial_channel *chan)
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235 {
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236 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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237 CYG_ADDRWORD base = aaed2000_chan->base;
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238 cyg_uint32 _status;
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239 cyg_uint32 _c;
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240
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241 do {
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242 HAL_READ_UINT32(base+AAEC_UART_STATUS, _status);
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243 } while (_status & AAEC_UART_STATUS_RxFE);
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244
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245 HAL_READ_UINT32(base+AAEC_UART_DATA, _c);
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246 return (unsigned char)_c;
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247 }
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248
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249 // Set up the device characteristics; baud rate, etc.
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250 static Cyg_ErrNo
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251 aaed2000_serial_set_config(serial_channel *chan, cyg_uint32 key,
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252 const void *xbuf, cyg_uint32 *len)
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253 {
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254 switch (key) {
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255 case CYG_IO_SET_CONFIG_SERIAL_INFO:
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256 {
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257 cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
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258 if ( *len < sizeof(cyg_serial_info_t) ) {
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259 return -EINVAL;
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260 }
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261 *len = sizeof(cyg_serial_info_t);
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262 if ( true != aaed2000_serial_config_port(chan, config, false) )
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263 return -EINVAL;
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264 }
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265 break;
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266 default:
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267 return -EINVAL;
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268 }
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269 return ENOERR;
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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 aaed2000_serial_start_xmit(serial_channel *chan)
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275 {
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276 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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277 CYG_ADDRWORD base = aaed2000_chan->base;
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278 cyg_uint32 _intm;
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279
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280 HAL_READ_UINT32(base+AAEC_UART_INTM, _intm);
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281 _intm |= AAEC_UART_INT_TIS;
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282 HAL_WRITE_UINT32(base+AAEC_UART_INTM, _intm);
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283 }
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284
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285 // Disable the transmitter on the device
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286 static void
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287 aaed2000_serial_stop_xmit(serial_channel *chan)
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288 {
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289 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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290 CYG_ADDRWORD base = aaed2000_chan->base;
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291 cyg_uint32 _intm;
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292
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293 HAL_READ_UINT32(base+AAEC_UART_INTM, _intm);
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294 _intm &= ~AAEC_UART_INT_TIS;
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295 HAL_WRITE_UINT32(base+AAEC_UART_INTM, _intm);
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296 }
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297
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298 // Serial I/O - low level interrupt handler (ISR)
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299 static cyg_uint32
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300 aaed2000_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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301 {
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302 serial_channel *chan = (serial_channel *)data;
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303 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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304 cyg_drv_interrupt_mask(aaed2000_chan->int_num);
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305 cyg_drv_interrupt_acknowledge(aaed2000_chan->int_num);
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306 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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307 }
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308
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309 // Serial I/O - high level interrupt handler (DSR)
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310 static void
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311 aaed2000_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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312 {
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313 serial_channel *chan = (serial_channel *)data;
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314 aaed2000_serial_info *aaed2000_chan = (aaed2000_serial_info *)chan->dev_priv;
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315 CYG_ADDRWORD base = aaed2000_chan->base;
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316 cyg_uint32 _intres, _c;
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317
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318 HAL_READ_UINT32(base+AAEC_UART_INTRES, _intres);
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319 _intres &= (AAEC_UART_INT_TIS | AAEC_UART_INT_RIS | AAEC_UART_INT_RTIS);
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320 while (_intres) {
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321
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322 // Empty Rx FIFO
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323 if (_intres & (AAEC_UART_INT_RIS|AAEC_UART_INT_RTIS)) {
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324 HAL_READ_UINT32(base+AAEC_UART_DATA, _c);
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325 (chan->callbacks->rcv_char)(chan, (unsigned char)_c);
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326 }
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327
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328 // Fill into Tx FIFO. xmt_char will mask the interrupt when it
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329 // runs out of chars, so doing this in a loop is OK.
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330 if (_intres & AAEC_UART_INT_TIS) {
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331 (chan->callbacks->xmt_char)(chan);
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332 }
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333
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334 HAL_READ_UINT32(base+AAEC_UART_INTRES, _intres);
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335 _intres &= (AAEC_UART_INT_TIS | AAEC_UART_INT_RIS | AAEC_UART_INT_RTIS);
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336 }
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337
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338 cyg_drv_interrupt_unmask(aaed2000_chan->int_num);
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339 }