Mercurial > ecos

annotate packages/hal/sh/sh2/current/src/sh2_sci.c @ 267:797015ac62f3

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Remove 'const' from channel information - it _can_ change (timeout period).
author gthomas
date Tue, 06 Aug 2002 16:00:08 +0000
parents d2c90368aeef
children 74dbf4c3f2e1
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1 //=============================================================================
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2 //
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3 // sh2_sci.c
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4 //
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5 // Simple driver for the SH Serial Communication Interface (SCI)
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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): jskov
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44 // Contributors:jskov
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45 // Date: 1999-05-17
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46 // Description: Simple driver for the SH Serial Communication Interface
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47 // Clients of this file can configure the behavior with:
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48 // CYGNUM_SCI_PORTS: number of SCI ports
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //=============================================================================
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53
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54 #include <pkgconf/hal.h>
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55
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56 #ifdef CYGNUM_HAL_SH_SH2_SCI_PORTS
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57
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58 #include <cyg/hal/hal_io.h> // IO macros
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59 #include <cyg/hal/drv_api.h> // CYG_ISR_HANDLED
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60 #include <cyg/hal/hal_misc.h> // Helper functions
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61 #include <cyg/hal/hal_intr.h> // HAL_ENABLE/MASK/UNMASK_INTERRUPTS
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62 #include <cyg/hal/hal_arch.h> // SAVE/RESTORE GP
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63 #include <cyg/hal/hal_if.h> // Calling-if API
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64 #include <cyg/hal/sh_regs.h> // serial register definitions
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65
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66 #define CYGPRI_HAL_SH_SH2_SCI_PRIVATE
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67 #include <cyg/hal/sh2_sci.h> // our header
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68
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69 //--------------------------------------------------------------------------
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70
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71 void
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72 cyg_hal_plf_sci_init_channel(channel_data_t* chan)
208
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73 {
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74 cyg_uint8 tmp;
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75 cyg_uint8* base = chan->base;
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76
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77 // Disable Tx/Rx interrupts, but enable Tx/Rx
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78 HAL_WRITE_UINT8(base+_REG_SCSCR,
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79 CYGARC_REG_SCI_SCSCR_TE|CYGARC_REG_SCI_SCSCR_RE);
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80
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81 // 8-1-no parity.
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82 HAL_WRITE_UINT8(base+_REG_SCSMR, 0);
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83
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84 // Set speed to CYGNUM_HAL_SH_SH2_SCI_DEFAULT_BAUD_RATE
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85 HAL_READ_UINT8(base+_REG_SCSMR, tmp);
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86 tmp &= ~CYGARC_REG_SCI_SCSMR_CKSx_MASK;
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87 tmp |= CYGARC_SCBRR_CKSx(CYGNUM_HAL_SH_SH2_SCI_BAUD_RATE);
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88 HAL_WRITE_UINT8(base+_REG_SCSMR, tmp);
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89 HAL_WRITE_UINT8(base+_REG_SCBRR, CYGARC_SCBRR_N(CYGNUM_HAL_SH_SH2_SCI_BAUD_RATE));
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90 }
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91
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92 static cyg_bool
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93 cyg_hal_plf_sci_getc_nonblock(void* __ch_data, cyg_uint8* ch)
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94 {
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95 cyg_uint8* base = ((channel_data_t*)__ch_data)->base;
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96 cyg_uint8 sr;
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97
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98 HAL_READ_UINT8(base+_REG_SCSSR, sr);
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99 if (sr & CYGARC_REG_SCI_SCSSR_ORER) {
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100 // Serial RX overrun. Clear error and let caller try again.
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101 HAL_WRITE_UINT8(base+_REG_SCSSR,
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102 CYGARC_REG_SCI_SCSSR_CLEARMASK & ~CYGARC_REG_SCI_SCSSR_ORER);
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103 return false;
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104 }
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105
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106 if ((sr & CYGARC_REG_SCI_SCSSR_RDRF) == 0)
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107 return false;
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108
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109 HAL_READ_UINT8(base+_REG_SCRDR, *ch);
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110
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111 // Clear buffer full flag.
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112 HAL_WRITE_UINT8(base+_REG_SCSSR, sr & ~CYGARC_REG_SCI_SCSSR_RDRF);
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113
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114 return true;
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115 }
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116
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117 cyg_uint8
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118 cyg_hal_plf_sci_getc(void* __ch_data)
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119 {
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120 cyg_uint8 ch;
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121 CYGARC_HAL_SAVE_GP();
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122
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123 while(!cyg_hal_plf_sci_getc_nonblock(__ch_data, &ch));
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124
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125 CYGARC_HAL_RESTORE_GP();
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126 return ch;
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127 }
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128
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129 void
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130 cyg_hal_plf_sci_putc(void* __ch_data, cyg_uint8 c)
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131 {
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132 cyg_uint8* base = ((channel_data_t*)__ch_data)->base;
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133 cyg_uint8 sr;
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134 CYGARC_HAL_SAVE_GP();
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135
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136 do {
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137 HAL_READ_UINT8(base+_REG_SCSSR, sr);
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138 } while ((sr & CYGARC_REG_SCI_SCSSR_TDRE) == 0);
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139
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140 HAL_WRITE_UINT8(base+_REG_SCTDR, c);
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141
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142 // Clear empty flag.
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143 HAL_WRITE_UINT8(base+_REG_SCSSR, sr & ~CYGARC_REG_SCI_SCSSR_TDRE);
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144
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145 // Hang around until the character has been safely sent.
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146 do {
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147 HAL_READ_UINT8(base+_REG_SCSSR, sr);
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148 } while ((sr & CYGARC_REG_SCI_SCSSR_TDRE) == 0);
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149
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150 CYGARC_HAL_RESTORE_GP();
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151 }
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152
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153
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154 static channel_data_t channels[CYGNUM_HAL_SH_SH2_SCI_PORTS];
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155
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156 static void
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157 cyg_hal_plf_sci_write(void* __ch_data, const cyg_uint8* __buf,
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158 cyg_uint32 __len)
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159 {
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160 CYGARC_HAL_SAVE_GP();
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161
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162 while(__len-- > 0)
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163 cyg_hal_plf_sci_putc(__ch_data, *__buf++);
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164
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165 CYGARC_HAL_RESTORE_GP();
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166 }
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167
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168 static void
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169 cyg_hal_plf_sci_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)
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170 {
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171 CYGARC_HAL_SAVE_GP();
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172
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173 while(__len-- > 0)
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174 *__buf++ = cyg_hal_plf_sci_getc(__ch_data);
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175
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176 CYGARC_HAL_RESTORE_GP();
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177 }
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178
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179 cyg_bool
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180 cyg_hal_plf_sci_getc_timeout(void* __ch_data, cyg_uint8* ch)
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181 {
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182 channel_data_t* chan = (channel_data_t*)__ch_data;
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183 int delay_count;
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184 cyg_bool res;
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185 CYGARC_HAL_SAVE_GP();
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186
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187 delay_count = chan->msec_timeout * 10; // delay in .1 ms steps
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188
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189 for(;;) {
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190 res = cyg_hal_plf_sci_getc_nonblock(__ch_data, ch);
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191 if (res || 0 == delay_count--)
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192 break;
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193
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194 CYGACC_CALL_IF_DELAY_US(100);
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195 }
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196
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197 CYGARC_HAL_RESTORE_GP();
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198 return res;
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199 }
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200
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201 static int
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202 cyg_hal_plf_sci_control(void *__ch_data, __comm_control_cmd_t __func, ...)
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203 {
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204 static int irq_state = 0;
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205 channel_data_t* chan = (channel_data_t*)__ch_data;
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206 cyg_uint8 scr;
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207 int ret = 0;
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208 CYGARC_HAL_SAVE_GP();
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209
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210 switch (__func) {
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211 case __COMMCTL_IRQ_ENABLE:
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212 irq_state = 1;
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213 HAL_INTERRUPT_UNMASK(chan->isr_vector);
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214 HAL_READ_UINT8(chan->base+_REG_SCSCR, scr);
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215 scr |= CYGARC_REG_SCI_SCSCR_RIE;
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216 HAL_WRITE_UINT8(chan->base+_REG_SCSCR, scr);
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217 break;
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218 case __COMMCTL_IRQ_DISABLE:
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219 ret = irq_state;
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220 irq_state = 0;
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221 HAL_INTERRUPT_UNMASK(chan->isr_vector);
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222 HAL_READ_UINT8(chan->base+_REG_SCSCR, scr);
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223 scr &= ~CYGARC_REG_SCI_SCSCR_RIE;
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224 HAL_WRITE_UINT8(chan->base+_REG_SCSCR, scr);
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225 break;
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226 case __COMMCTL_DBG_ISR_VECTOR:
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227 ret = chan->isr_vector;
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228 break;
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229 case __COMMCTL_SET_TIMEOUT:
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230 {
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231 va_list ap;
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232
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233 va_start(ap, __func);
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234
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235 ret = chan->msec_timeout;
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236 chan->msec_timeout = va_arg(ap, cyg_uint32);
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237
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238 va_end(ap);
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239 }
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240 default:
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241 break;
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242 }
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243 CYGARC_HAL_RESTORE_GP();
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244 return ret;
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245 }
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246
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247 static int
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248 cyg_hal_plf_sci_isr(void *__ch_data, int* __ctrlc,
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249 CYG_ADDRWORD __vector, CYG_ADDRWORD __data)
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250 {
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251 cyg_uint8 c, sr;
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252 cyg_uint8* base = ((channel_data_t*)__ch_data)->base;
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253 int res = 0;
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254 CYGARC_HAL_SAVE_GP();
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255
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256 *__ctrlc = 0;
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257 HAL_READ_UINT8(base+_REG_SCSSR, sr);
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258 if (sr & CYGARC_REG_SCI_SCSSR_ORER) {
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259 // Serial RX overrun. Clear error and hope protocol recovers.
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260 HAL_WRITE_UINT8(base+_REG_SCSSR,
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261 CYGARC_REG_SCI_SCSSR_CLEARMASK & ~CYGARC_REG_SCI_SCSSR_ORER);
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262 res = CYG_ISR_HANDLED;
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263 } else if (sr & CYGARC_REG_SCI_SCSSR_RDRF) {
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264 // Received character
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265 HAL_READ_UINT8(base+_REG_SCRDR, c);
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266
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267 // Clear buffer full flag.
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268 HAL_WRITE_UINT8(base+_REG_SCSSR,
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269 CYGARC_REG_SCI_SCSSR_CLEARMASK & ~CYGARC_REG_SCI_SCSSR_RDRF);
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270
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271 if( cyg_hal_is_break( &c , 1 ) )
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272 *__ctrlc = 1;
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273
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274 res = CYG_ISR_HANDLED;
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275 }
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276
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277 CYGARC_HAL_RESTORE_GP();
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278 return res;
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279 }
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280
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281 void
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282 cyg_hal_plf_sci_init(int sci_index, int comm_index,
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283 int rcv_vect, cyg_uint8* base)
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284 {
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285 channel_data_t* chan = &channels[sci_index];
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286 hal_virtual_comm_table_t* comm;
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287 int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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288
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289 // Initialize channel table
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290 chan->base = base;
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291 chan->isr_vector = rcv_vect;
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292 chan->msec_timeout = 1000;
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293
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294 // Disable interrupts.
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295 HAL_INTERRUPT_MASK(chan->isr_vector);
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296
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297 // Init channel
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298
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299 cyg_hal_plf_sci_init_channel(chan);
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300
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301 // Setup procs in the vector table
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302
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303 // Initialize channel procs
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304 CYGACC_CALL_IF_SET_CONSOLE_COMM(comm_index);
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305 comm = CYGACC_CALL_IF_CONSOLE_PROCS();
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306 CYGACC_COMM_IF_CH_DATA_SET(*comm, chan);
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307 CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_sci_write);
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308 CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_sci_read);
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309 CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_sci_putc);
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310 CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_sci_getc);
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311 CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_sci_control);
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312 CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_sci_isr);
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313 CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_sci_getc_timeout);
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314
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315 // Restore original console
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316 CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
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317 }
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318
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319 #endif // CYGNUM_HAL_SH_SH2_SCI_PORTS
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320
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321 //-----------------------------------------------------------------------------
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322 // end of sh_sci.c