1 | /* |
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2 | * /dev/sci[0|1] for Hitachi SH 704X |
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3 | * |
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4 | * The SH doesn't have a designated console device. Therefore we "alias" |
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5 | * another device as /dev/console and revector all calls to /dev/console |
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6 | * to this device. |
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7 | * |
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8 | * This approach is similar to installing a sym-link from one device to |
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9 | * another device. If rtems once will support sym-links for devices files, |
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10 | * this implementation could be dropped. |
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11 | * |
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12 | * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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13 | * |
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14 | * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany |
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15 | * |
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16 | * This program is distributed in the hope that it will be useful, |
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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19 | * |
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20 | * |
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21 | * COPYRIGHT (c) 1998. |
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22 | * On-Line Applications Research Corporation (OAR). |
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23 | * Copyright assigned to U.S. Government, 1994. |
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24 | * |
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25 | * The license and distribution terms for this file may be |
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26 | * found in the file LICENSE in this distribution or at |
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27 | * http://www.OARcorp.com/rtems/license.html. |
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28 | * |
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29 | * Modified to reflect sh7045 processor: |
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30 | * John M. Mills (jmills@tga.com) |
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31 | * TGA Technologies, Inc. |
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32 | * 100 Pinnacle Way, Suite 140 |
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33 | * Norcross, GA 30071 U.S.A. |
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34 | * |
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35 | * This modified file may be copied and distributed in accordance |
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36 | * the above-referenced license. It is provided for critique and |
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37 | * developmental purposes without any warranty nor representation |
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38 | * by the authors or by TGA Technologies. |
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39 | * |
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40 | * $Id$ |
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41 | */ |
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42 | |
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43 | #include <rtems.h> |
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44 | |
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45 | #include <stdlib.h> |
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46 | |
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47 | #include <rtems/libio.h> |
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48 | #include <iosupp.h> |
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49 | #include <rtems/score/sh_io.h> |
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50 | #include <rtems/score/ispsh7045.h> |
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51 | #include <rtems/score/iosh7045.h> |
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52 | #include <sh/sh7_sci.h> |
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53 | #include <sh/io_types.h> |
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54 | #include <sh/sci.h> |
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55 | |
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56 | struct scidev_t { |
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57 | char * name ; |
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58 | rtems_device_minor_number minor ; |
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59 | unsigned short opened ; |
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60 | tcflag_t cflags ; |
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61 | } sci_device[2] = |
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62 | { |
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63 | { "/dev/sci0", 0, 0, B9600 | CS8 }, |
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64 | { "/dev/sci1", 0, 0, B9600 | CS8 } |
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65 | } ; |
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66 | |
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67 | /* local data structures maintain hardware configuration */ |
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68 | extern int _sci_get_brparms( |
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69 | tcflag_t cflag, |
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70 | unsigned char *smr, |
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71 | unsigned char *brr ); |
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72 | |
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73 | #if UNUSED |
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74 | static sci_setup_t sio_param[2]; |
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75 | #endif |
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76 | |
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77 | /* local functions operate SCI ports 0 and 1 */ |
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78 | /* called from polling routines or ISRs */ |
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79 | rtems_boolean wrtSCI0(unsigned char ch) |
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80 | { |
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81 | unsigned8 temp; |
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82 | rtems_boolean result=FALSE; |
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83 | |
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84 | if ((read8(SCI_SSR0) & SCI_TDRE) != 0x00) { |
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85 | /* Write the character to the TDR */ |
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86 | write8(ch, SCI_TDR0); |
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87 | /* Clear the TDRE bit */ |
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88 | temp = read8(SCI_SSR0) & ~SCI_TDRE; |
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89 | write8(temp, SCI_SSR0); |
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90 | result = TRUE; |
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91 | } |
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92 | return result; |
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93 | } /* wrtSCI0 */ |
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94 | |
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95 | rtems_boolean wrtSCI1(unsigned char ch) |
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96 | { |
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97 | unsigned8 temp; |
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98 | rtems_boolean result=FALSE; |
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99 | |
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100 | if ((read8(SCI_SSR1) & SCI_TDRE) != 0x00) { |
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101 | /* Write the character to the TDR */ |
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102 | write8(ch, SCI_TDR1); |
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103 | /* Clear the TDRE bit */ |
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104 | temp = read8(SCI_SSR1) & ~SCI_TDRE; |
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105 | write8(temp, SCI_SSR1); |
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106 | result = TRUE; |
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107 | } |
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108 | return result; |
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109 | } /* wrtSCI1 */ |
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110 | |
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111 | /* polled output steers byte to selected port */ |
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112 | void sh_sci_outbyte_polled( |
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113 | rtems_device_minor_number minor, |
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114 | char ch ) |
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115 | { |
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116 | if (minor == 0) /* blocks until port ready */ |
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117 | while (wrtSCI0(ch) != TRUE); /* SCI0*/ |
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118 | else |
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119 | while (wrtSCI1(ch) != TRUE); /* SCI1*/ |
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120 | } /* sh_sci_outbyte_polled */ |
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121 | |
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122 | /* Initial version calls polled output driver and blocks */ |
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123 | void outbyte( |
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124 | rtems_device_minor_number minor, |
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125 | char ch) |
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126 | { |
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127 | sh_sci_outbyte_polled(minor, (unsigned char)ch); |
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128 | } /* outbyte */ |
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129 | |
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130 | rtems_boolean rdSCI0(unsigned char *ch) |
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131 | { |
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132 | unsigned8 temp; |
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133 | rtems_boolean result=FALSE; |
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134 | |
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135 | if ((read8(SCI_SSR0) & SCI_RDRF) != 0x00) { |
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136 | /* Write the character to the TDR */ |
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137 | write8(*ch, SCI_RDR0); |
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138 | /* Clear the TDRE bit */ |
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139 | temp = read8(SCI_SSR0) & ~SCI_RDRF; |
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140 | write8(temp, SCI_SSR0); |
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141 | result = TRUE; |
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142 | } |
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143 | return result; |
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144 | } /* rdSCI0 */ |
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145 | |
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146 | rtems_boolean rdSCI1(unsigned char *ch) |
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147 | { |
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148 | unsigned8 temp; |
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149 | rtems_boolean result=FALSE; |
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150 | |
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151 | if ((read8(SCI_SSR1) & SCI_RDRF) != 0x00) { |
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152 | /* Write the character to the TDR */ |
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153 | write8(*ch, SCI_RDR1); |
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154 | /* Clear the TDRE bit */ |
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155 | temp= read8(SCI_SSR1) & ~SCI_RDRF; |
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156 | write8(temp, SCI_SSR1); |
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157 | result = TRUE; |
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158 | } |
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159 | return result; |
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160 | } /* rdSCI1 */ |
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161 | |
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162 | |
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163 | /* initial version pulls byte from selected port */ |
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164 | char sh_sci_inbyte_polled( |
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165 | rtems_device_minor_number minor ) |
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166 | { |
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167 | char ch; |
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168 | |
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169 | if (minor == 0) /* blocks until char.ready */ |
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170 | while (rdSCI0(&ch) != TRUE); /* SCI0 */ |
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171 | else |
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172 | while (rdSCI1(&ch) != TRUE); /* SCI1 */ |
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173 | return ch; |
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174 | } /* sh_sci_inbyte_polled */ |
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175 | |
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176 | /* Initial version calls polled input driver */ |
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177 | char inbyte( |
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178 | rtems_device_minor_number minor ) |
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179 | { |
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180 | char ch; |
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181 | |
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182 | ch = sh_sci_inbyte_polled(minor); |
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183 | return ch; |
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184 | } /* inbyte */ |
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185 | |
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186 | |
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187 | /* sh_sci_initialize |
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188 | * |
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189 | * This routine initializes the sh_sci IO driver. |
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190 | * |
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191 | * Input parameters: NONE |
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192 | * |
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193 | * Output parameters: NONE |
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194 | * |
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195 | * Return values: |
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196 | */ |
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197 | |
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198 | rtems_device_driver sh_sci_initialize( |
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199 | rtems_device_major_number major, |
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200 | rtems_device_minor_number minor, |
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201 | void *arg ) |
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202 | { |
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203 | int a; |
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204 | unsigned16 temp16; |
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205 | rtems_device_driver status ; |
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206 | |
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207 | /* register devices */ |
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208 | for ( a = 0 ; a < 2 ; a++ ) |
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209 | { |
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210 | status = rtems_io_register_name( |
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211 | sci_device[a].name, |
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212 | major, |
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213 | sci_device[a].minor ); |
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214 | if (status != RTEMS_SUCCESSFUL) |
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215 | rtems_fatal_error_occurred(status); |
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216 | } |
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217 | |
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218 | /* default hardware setup */ |
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219 | |
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220 | /* general setup */ |
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221 | temp16 = read16(PFC_PECR1) | 0x0800; /* General I/O except pin 13 (reset) */ |
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222 | write16(temp16, PFC_PECR1); |
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223 | write16(0x00, PFC_PECR2); /* All I/O lines bits 7-0 */ |
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224 | temp16 = read16(PFC_PEIOR) | 0x0020; /* P5 to out, all other pins in */ |
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225 | write16(temp16, PFC_PEIOR); |
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226 | |
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227 | temp16 = read16(PFC_PACRL2) | 0x0145; /* PFC - pins for Tx0-1, Rx0-1 */ |
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228 | write16(temp16, PFC_PACRL2); |
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229 | |
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230 | return RTEMS_SUCCESSFUL; |
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231 | } |
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232 | |
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233 | |
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234 | /* |
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235 | * Open entry point |
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236 | */ |
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237 | |
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238 | rtems_device_driver sh_sci_open( |
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239 | rtems_device_major_number major, |
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240 | rtems_device_minor_number minor, |
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241 | void * arg ) |
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242 | { |
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243 | unsigned8 temp8; |
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244 | unsigned char smr ; |
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245 | unsigned char brr ; |
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246 | |
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247 | unsigned a ; |
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248 | |
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249 | /* device already opened */ |
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250 | if ( sci_device[minor].opened > 0 ) |
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251 | { |
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252 | sci_device[minor].opened++ ; |
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253 | |
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254 | return RTEMS_SUCCESSFUL ; |
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255 | } |
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256 | |
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257 | /* retrieve brr and smr values */ |
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258 | _sci_get_brparms( sci_device[minor].cflags, &smr, &brr ); |
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259 | |
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260 | if (minor == 0) { |
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261 | write8(0x00, SCI_SCR0); /* Clear SCR */ |
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262 | write8(smr, SCI_SMR0); /* Clear SMR */ |
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263 | write8(brr, SCI_BRR0); /* Default 9600 baud rate */ |
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264 | #if 0 |
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265 | write8(0x1F, SCI_BRR0); /* 28800 baud */ |
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266 | #endif |
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267 | /* FIXME: Will get optimized away */ |
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268 | for(a=0;a<10000L;a++); /* One bit delay */ |
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269 | write8(0x30, SCI_SCR0); /* Enable clock output */ |
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270 | temp8 = read8(SCI_RDR0); /* Clear out old input */ |
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271 | |
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272 | } else { |
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273 | write8(0x00, SCI_SCR1); /* Clear SCR */ |
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274 | write8(smr, SCI_SMR1); /* Clear SMR */ |
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275 | write8(brr, SCI_BRR1); /* Default 9600 baud rate */ |
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276 | #if 0 |
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277 | write8(0x1F, SCI_BRR1); /* 28800 baud */ |
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278 | #endif |
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279 | /* FIXME: Will get optimized away */ |
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280 | for(a=0;a<10000L;a++); /* One bit delay */ |
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281 | write8(0x30, SCI_SCR1); /* Enable clock output */ |
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282 | temp8 = read8(SCI_RDR1); /* Clear out old input */ |
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283 | } |
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284 | |
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285 | sci_device[minor].opened++ ; |
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286 | |
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287 | return RTEMS_SUCCESSFUL ; |
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288 | } |
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289 | |
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290 | /* |
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291 | * Close entry point |
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292 | */ |
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293 | |
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294 | rtems_device_driver sh_sci_close( |
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295 | rtems_device_major_number major, |
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296 | rtems_device_minor_number minor, |
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297 | void * arg |
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298 | ) |
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299 | { |
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300 | /* FIXME: Incomplete */ |
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301 | if ( sci_device[minor].opened > 0 ) |
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302 | sci_device[minor].opened-- ; |
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303 | else |
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304 | return RTEMS_INVALID_NUMBER ; |
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305 | |
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306 | return RTEMS_SUCCESSFUL ; |
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307 | } |
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308 | |
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309 | /* |
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310 | * read bytes from the serial port. We only have stdin. |
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311 | */ |
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312 | |
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313 | rtems_device_driver sh_sci_read( |
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314 | rtems_device_major_number major, |
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315 | rtems_device_minor_number minor, |
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316 | void * arg |
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317 | ) |
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318 | { |
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319 | rtems_libio_rw_args_t *rw_args; |
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320 | char *buffer; |
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321 | int maximum; |
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322 | int count = 0; |
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323 | |
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324 | rw_args = (rtems_libio_rw_args_t *) arg; |
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325 | |
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326 | buffer = rw_args->buffer; |
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327 | maximum = rw_args->count; |
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328 | |
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329 | for (count = 0; count < maximum; count++) { |
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330 | buffer[ count ] = inbyte(minor); |
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331 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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332 | buffer[ count++ ] = '\n'; |
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333 | break; |
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334 | } |
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335 | } |
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336 | |
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337 | rw_args->bytes_moved = count; |
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338 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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339 | } |
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340 | |
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341 | /* |
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342 | * write bytes to the serial port. Stdout and stderr are the same. |
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343 | */ |
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344 | |
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345 | rtems_device_driver sh_sci_write( |
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346 | rtems_device_major_number major, |
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347 | rtems_device_minor_number minor, |
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348 | void * arg |
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349 | ) |
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350 | { |
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351 | int count; |
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352 | int maximum; |
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353 | rtems_libio_rw_args_t *rw_args; |
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354 | char *buffer; |
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355 | |
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356 | rw_args = (rtems_libio_rw_args_t *) arg; |
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357 | |
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358 | buffer = rw_args->buffer; |
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359 | maximum = rw_args->count; |
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360 | |
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361 | for (count = 0; count < maximum; count++) { |
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362 | if ( buffer[ count ] == '\n') { |
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363 | outbyte(minor, '\r'); |
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364 | } |
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365 | outbyte( minor, buffer[ count ] ); |
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366 | } |
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367 | |
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368 | rw_args->bytes_moved = maximum; |
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369 | return 0; |
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370 | } |
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371 | |
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372 | /* |
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373 | * IO Control entry point |
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374 | */ |
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375 | |
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376 | rtems_device_driver sh_sci_control( |
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377 | rtems_device_major_number major, |
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378 | rtems_device_minor_number minor, |
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379 | void * arg |
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380 | ) |
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381 | { |
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382 | /* Not yet supported */ |
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383 | return RTEMS_SUCCESSFUL ; |
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384 | } |
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