1 | /* |
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2 | * /dev/sci[0|1] for Hitachi SH 703X |
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3 | * |
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4 | * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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5 | * |
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6 | * COPYRIGHT (c) 1997-1999, Ralf Corsepius, Ulm, Germany |
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7 | * |
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8 | * This program is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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11 | * |
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12 | * |
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13 | * COPYRIGHT (c) 1998. |
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14 | * On-Line Applications Research Corporation (OAR). |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.org/license/LICENSE. |
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19 | */ |
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20 | |
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21 | #include <rtems.h> |
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22 | |
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23 | #include <stdlib.h> |
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24 | |
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25 | #include <rtems/libio.h> |
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26 | #include <rtems/iosupp.h> |
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27 | #include <rtems/score/sh_io.h> |
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28 | #include <rtems/score/ispsh7032.h> |
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29 | #include <rtems/score/iosh7032.h> |
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30 | #include <sh/sh7_sci.h> |
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31 | #include <sh/sh7_pfc.h> |
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32 | #include <sh/sci.h> |
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33 | |
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34 | /* |
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35 | * NOTE: Some SH variants have 3 sci devices |
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36 | */ |
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37 | |
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38 | #define SCI_MINOR_DEVICES 2 |
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39 | |
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40 | #define SH_SCI_BASE_0 SCI0_SMR |
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41 | #define SH_SCI_BASE_1 SCI1_SMR |
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42 | |
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43 | struct scidev_t { |
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44 | char * name ; |
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45 | uint32_t addr ; |
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46 | rtems_device_minor_number minor ; |
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47 | unsigned short opened ; |
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48 | tcflag_t cflags ; |
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49 | } sci_device[SCI_MINOR_DEVICES] = |
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50 | { |
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51 | { "/dev/sci0", SH_SCI_BASE_0, 0, 0, B9600 | CS8 }, |
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52 | { "/dev/sci1", SH_SCI_BASE_1, 1, 0, B9600 | CS8 } |
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53 | } ; |
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54 | |
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55 | /* imported from scitab.rel */ |
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56 | extern int _sci_get_brparms( |
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57 | tcflag_t cflag, |
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58 | unsigned char *smr, |
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59 | unsigned char *brr ); |
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60 | |
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61 | /* Translate termios' tcflag_t into sci settings */ |
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62 | static int _sci_set_cflags( |
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63 | struct scidev_t *sci_dev, |
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64 | tcflag_t c_cflag ) |
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65 | { |
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66 | uint8_t smr ; |
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67 | uint8_t brr ; |
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68 | |
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69 | if ( c_cflag & CBAUD ) |
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70 | { |
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71 | if ( _sci_get_brparms( c_cflag, &smr, &brr ) != 0 ) |
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72 | return -1 ; |
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73 | } |
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74 | |
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75 | if ( c_cflag & CSIZE ) |
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76 | { |
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77 | if ( c_cflag & CS8 ) |
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78 | smr &= ~SCI_SEVEN_BIT_DATA; |
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79 | else if ( c_cflag & CS7 ) |
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80 | smr |= SCI_SEVEN_BIT_DATA; |
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81 | else |
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82 | return -1 ; |
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83 | } |
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84 | |
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85 | if ( c_cflag & CSTOPB ) |
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86 | smr |= SCI_STOP_BITS_2; |
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87 | else |
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88 | smr &= ~SCI_STOP_BITS_2; |
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89 | |
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90 | if ( c_cflag & PARENB ) |
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91 | smr |= SCI_PARITY_ON ; |
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92 | else |
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93 | smr &= ~SCI_PARITY_ON ; |
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94 | |
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95 | if ( c_cflag & PARODD ) |
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96 | smr |= SCI_ODD_PARITY ; |
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97 | else |
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98 | smr &= ~SCI_ODD_PARITY; |
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99 | |
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100 | write8( smr, sci_dev->addr + SCI_SMR ); |
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101 | write8( brr, sci_dev->addr + SCI_BRR ); |
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102 | |
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103 | return 0 ; |
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104 | } |
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105 | |
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106 | static void _sci_init( |
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107 | rtems_device_minor_number minor ) |
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108 | { |
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109 | uint16_t temp16 ; |
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110 | |
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111 | /* Pin function controller initialisation for asynchronous mode */ |
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112 | if( minor == 0) |
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113 | { |
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114 | temp16 = read16( PFC_PBCR1); |
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115 | temp16 &= ~( PB8MD | PB9MD ); |
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116 | temp16 |= (PB_TXD0 | PB_RXD0); |
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117 | write16( temp16, PFC_PBCR1); |
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118 | } |
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119 | else |
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120 | { |
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121 | temp16 = read16( PFC_PBCR1); |
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122 | temp16 &= ~( PB10MD | PB11MD); |
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123 | temp16 |= (PB_TXD1 | PB_RXD1); |
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124 | write16( temp16, PFC_PBCR1); |
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125 | } |
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126 | |
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127 | /* disable sck-pin */ |
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128 | if( minor == 0) |
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129 | { |
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130 | temp16 = read16( PFC_PBCR1); |
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131 | temp16 &= ~(PB12MD); |
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132 | write16( temp16, PFC_PBCR1); |
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133 | } |
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134 | else |
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135 | { |
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136 | temp16 = read16( PFC_PBCR1); |
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137 | temp16 &= ~(PB13MD); |
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138 | write16( temp16, PFC_PBCR1); |
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139 | } |
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140 | } |
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141 | |
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142 | static void _sci_tx_polled( |
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143 | int minor, |
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144 | const char buf ) |
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145 | { |
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146 | struct scidev_t *scidev = &sci_device[minor] ; |
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147 | int8_t ssr ; |
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148 | |
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149 | while ( !inb((scidev->addr + SCI_SSR) & SCI_TDRE )) |
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150 | ; |
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151 | write8(buf,scidev->addr+SCI_TDR); |
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152 | |
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153 | ssr = inb(scidev->addr+SCI_SSR); |
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154 | ssr &= ~SCI_TDRE ; |
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155 | write8(ssr,scidev->addr+SCI_SSR); |
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156 | } |
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157 | |
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158 | static int _sci_rx_polled ( |
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159 | int minor) |
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160 | { |
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161 | struct scidev_t *scidev = &sci_device[minor] ; |
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162 | |
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163 | unsigned char c; |
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164 | char ssr ; |
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165 | ssr = read8(scidev->addr + SCI_SSR) ; |
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166 | |
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167 | if (ssr & (SCI_PER | SCI_FER | SCI_ORER)) |
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168 | write8(ssr & ~(SCI_PER | SCI_FER | SCI_ORER), scidev->addr+SCI_SSR); |
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169 | |
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170 | if ( !(ssr & SCI_RDRF) ) |
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171 | return -1; |
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172 | |
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173 | c = read8(scidev->addr + SCI_RDR) ; |
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174 | |
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175 | write8(ssr & ~SCI_RDRF,scidev->addr + SCI_SSR); |
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176 | return c; |
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177 | } |
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178 | |
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179 | /* |
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180 | * sci_initialize |
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181 | */ |
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182 | |
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183 | rtems_device_driver sh_sci_initialize( |
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184 | rtems_device_major_number major, |
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185 | rtems_device_minor_number minor, |
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186 | void *arg ) |
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187 | { |
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188 | rtems_device_driver status ; |
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189 | rtems_device_minor_number i; |
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190 | |
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191 | /* |
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192 | * register all possible devices. |
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193 | * the initialization of the hardware is done by sci_open |
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194 | */ |
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195 | |
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196 | for ( i = 0 ; i < SCI_MINOR_DEVICES ; i++ ) |
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197 | { |
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198 | status = rtems_io_register_name( |
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199 | sci_device[i].name, |
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200 | major, |
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201 | sci_device[i].minor ); |
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202 | if (status != RTEMS_SUCCESSFUL) |
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203 | rtems_fatal_error_occurred(status); |
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204 | } |
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205 | |
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206 | /* default hardware setup */ |
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207 | |
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208 | return RTEMS_SUCCESSFUL; |
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209 | } |
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210 | |
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211 | |
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212 | /* |
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213 | * Open entry point |
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214 | */ |
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215 | |
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216 | rtems_device_driver sh_sci_open( |
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217 | rtems_device_major_number major, |
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218 | rtems_device_minor_number minor, |
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219 | void * arg ) |
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220 | { |
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221 | uint8_t temp8; |
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222 | |
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223 | /* check for valid minor number */ |
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224 | if(( minor > ( SCI_MINOR_DEVICES -1 )) || ( minor < 0 )) |
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225 | { |
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226 | return RTEMS_INVALID_NUMBER; |
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227 | } |
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228 | |
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229 | /* device already opened */ |
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230 | if ( sci_device[minor].opened > 0 ) |
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231 | { |
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232 | sci_device[minor].opened++ ; |
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233 | return RTEMS_SUCCESSFUL ; |
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234 | } |
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235 | |
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236 | _sci_init( minor ); |
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237 | |
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238 | if (minor == 0) { |
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239 | temp8 = read8(sci_device[minor].addr + SCI_SCR); |
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240 | temp8 &= ~(SCI_TE | SCI_RE) ; |
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241 | write8(temp8, sci_device[minor].addr + SCI_SCR); /* Clear SCR */ |
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242 | _sci_set_cflags( &sci_device[minor], sci_device[minor].cflags ); |
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243 | |
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244 | /* FIXME: Should be one bit delay */ |
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245 | CPU_delay(50000); /* microseconds */ |
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246 | |
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247 | temp8 |= SCI_RE | SCI_TE; |
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248 | write8(temp8, sci_device[minor].addr + SCI_SCR); /* Enable clock output */ |
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249 | } else { |
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250 | temp8 = read8(sci_device[minor].addr + SCI_SCR); |
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251 | temp8 &= ~(SCI_TE | SCI_RE) ; |
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252 | write8(temp8, sci_device[minor].addr + SCI_SCR); /* Clear SCR */ |
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253 | _sci_set_cflags( &sci_device[minor], sci_device[minor].cflags ); |
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254 | |
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255 | /* FIXME: Should be one bit delay */ |
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256 | CPU_delay(50000); /* microseconds */ |
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257 | |
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258 | temp8 |= SCI_RE | SCI_TE; |
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259 | write8(temp8, sci_device[minor].addr + SCI_SCR); /* Enable clock output */ |
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260 | } |
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261 | |
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262 | sci_device[minor].opened++ ; |
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263 | |
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264 | return RTEMS_SUCCESSFUL ; |
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265 | } |
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266 | |
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267 | /* |
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268 | * Close entry point |
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269 | */ |
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270 | |
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271 | rtems_device_driver sh_sci_close( |
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272 | rtems_device_major_number major, |
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273 | rtems_device_minor_number minor, |
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274 | void * arg |
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275 | ) |
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276 | { |
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277 | if( sci_device[minor].opened == 0 ) |
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278 | { |
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279 | return RTEMS_INVALID_NUMBER; |
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280 | } |
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281 | |
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282 | sci_device[minor].opened-- ; |
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283 | |
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284 | return RTEMS_SUCCESSFUL ; |
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285 | } |
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286 | |
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287 | /* |
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288 | * read bytes from the serial port. |
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289 | */ |
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290 | |
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291 | rtems_device_driver sh_sci_read( |
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292 | rtems_device_major_number major, |
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293 | rtems_device_minor_number minor, |
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294 | void * arg |
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295 | ) |
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296 | { |
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297 | int count = 0; |
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298 | |
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299 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) arg; |
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300 | char * buffer = rw_args->buffer; |
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301 | int maximum = rw_args->count; |
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302 | |
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303 | for (count = 0; count < maximum; count++) { |
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304 | buffer[ count ] = _sci_rx_polled(minor); |
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305 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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306 | buffer[ count++ ] = '\n'; |
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307 | break; |
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308 | } |
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309 | } |
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310 | |
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311 | rw_args->bytes_moved = count; |
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312 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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313 | } |
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314 | |
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315 | /* |
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316 | * write bytes to the serial port. |
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317 | */ |
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318 | |
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319 | rtems_device_driver sh_sci_write( |
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320 | rtems_device_major_number major, |
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321 | rtems_device_minor_number minor, |
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322 | void * arg |
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323 | ) |
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324 | { |
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325 | int count; |
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326 | |
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327 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) arg; |
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328 | char *buffer = rw_args->buffer; |
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329 | int maximum = rw_args->count; |
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330 | |
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331 | for (count = 0; count < maximum; count++) { |
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332 | #if 0 |
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333 | if ( buffer[ count ] == '\n') { |
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334 | outbyte(minor, '\r'); |
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335 | } |
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336 | #endif |
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337 | _sci_tx_polled( minor, buffer[ count ] ); |
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338 | } |
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339 | |
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340 | rw_args->bytes_moved = maximum; |
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341 | return 0; |
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342 | } |
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343 | |
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344 | /* |
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345 | * IO Control entry point |
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346 | */ |
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347 | |
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348 | rtems_device_driver sh_sci_control( |
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349 | rtems_device_major_number major, |
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350 | rtems_device_minor_number minor, |
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351 | void * arg |
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352 | ) |
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353 | { |
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354 | /* Not yet supported */ |
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355 | return RTEMS_SUCCESSFUL ; |
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356 | } |
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