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/sh7_pfc.h> |
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54 | /* #include <sh/io_types.h> */ |
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55 | #include <sh/sci.h> |
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56 | |
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57 | #ifndef STANDALONE_EVB |
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58 | #define STANDALONE_EVB 0 |
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59 | #endif |
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60 | |
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61 | /* |
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62 | * NOTE: Some SH variants have 3 sci devices |
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63 | */ |
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64 | |
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65 | #define SCI_MINOR_DEVICES 2 |
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66 | |
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67 | /* |
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68 | * FIXME: sh7045 register names match Hitachi data book, |
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69 | * but conflict with RTEMS sh7032 usage. |
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70 | */ |
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71 | |
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72 | #define SH_SCI_BASE_0 SCI_SMR0 |
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73 | #define SH_SCI_BASE_1 SCI_SMR1 |
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74 | |
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75 | #define SH_SCI_DEF_COMM_0 B9600 | CS8 |
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76 | #define SH_SCI_DEF_COMM_1 B38400 | CS8 |
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77 | /* #define SH_SCI_DEF_COMM_1 B9600 | CS8 */ |
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78 | |
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79 | struct scidev_t { |
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80 | char * name ; |
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81 | unsigned32 addr ; |
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82 | rtems_device_minor_number minor ; |
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83 | unsigned short opened ; |
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84 | tcflag_t cflags ; |
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85 | } sci_device[SCI_MINOR_DEVICES] = |
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86 | { |
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87 | { "/dev/sci0", SH_SCI_BASE_0, 0, 0, SH_SCI_DEF_COMM_0 }, |
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88 | { "/dev/sci1", SH_SCI_BASE_1, 1, 0, SH_SCI_DEF_COMM_1 } |
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89 | } ; |
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90 | |
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91 | /* local data structures maintain hardware configuration */ |
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92 | #if UNUSED |
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93 | static sci_setup_t sio_param[2]; |
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94 | #endif |
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95 | |
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96 | /* imported from scitab.rel */ |
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97 | extern int _sci_get_brparms( |
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98 | tcflag_t cflag, |
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99 | unsigned char *smr, |
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100 | unsigned char *brr ); |
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101 | |
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102 | /* Translate termios' tcflag_t into sci settings */ |
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103 | static int _sci_set_cflags( |
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104 | struct scidev_t *sci_dev, |
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105 | tcflag_t c_cflag ) |
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106 | { |
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107 | unsigned8 smr ; |
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108 | unsigned8 brr ; |
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109 | |
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110 | if ( c_cflag & CBAUD ) |
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111 | { |
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112 | if ( _sci_get_brparms( c_cflag, &smr, &brr ) != 0 ) |
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113 | return -1 ; |
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114 | } |
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115 | |
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116 | if ( c_cflag & CSIZE ) |
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117 | { |
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118 | if ( c_cflag & CS8 ) |
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119 | smr &= ~SCI_SEVEN_BIT_DATA; |
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120 | else if ( c_cflag & CS7 ) |
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121 | smr |= SCI_SEVEN_BIT_DATA; |
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122 | else |
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123 | return -1 ; |
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124 | } |
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125 | |
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126 | if ( c_cflag & CSTOPB ) |
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127 | smr |= SCI_STOP_BITS_2; |
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128 | else |
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129 | smr &= ~SCI_STOP_BITS_2; |
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130 | |
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131 | if ( c_cflag & PARENB ) |
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132 | smr |= SCI_PARITY_ON ; |
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133 | else |
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134 | smr &= ~SCI_PARITY_ON ; |
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135 | |
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136 | if ( c_cflag & PARODD ) |
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137 | smr |= SCI_ODD_PARITY ; |
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138 | else |
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139 | smr &= ~SCI_ODD_PARITY; |
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140 | |
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141 | write8( smr, sci_dev->addr + SCI_SMR ); |
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142 | write8( brr, sci_dev->addr + SCI_BRR ); |
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143 | |
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144 | return 0 ; |
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145 | } |
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146 | |
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147 | /* |
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148 | * local functions operate SCI ports 0 and 1 |
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149 | * called from polling routines or ISRs |
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150 | */ |
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151 | rtems_boolean wrtSCI0(unsigned char ch) |
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152 | { |
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153 | unsigned8 temp; |
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154 | rtems_boolean result=FALSE; |
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155 | |
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156 | if ((read8(SCI_SSR0) & SCI_TDRE) != 0x00) { |
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157 | /* Write the character to the TDR */ |
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158 | write8(ch, SCI_TDR0); |
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159 | /* Clear the TDRE bit */ |
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160 | temp = read8(SCI_SSR0) & ~SCI_TDRE; |
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161 | write8(temp, SCI_SSR0); |
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162 | result = TRUE; |
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163 | } |
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164 | return result; |
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165 | } /* wrtSCI0 */ |
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166 | |
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167 | rtems_boolean wrtSCI1(unsigned char ch) |
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168 | { |
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169 | unsigned8 temp; |
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170 | rtems_boolean result=FALSE; |
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171 | |
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172 | if ((read8(SCI_SSR1) & SCI_TDRE) != 0x00) { |
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173 | /* Write the character to the TDR */ |
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174 | write8(ch, SCI_TDR1); |
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175 | /* Clear the TDRE bit */ |
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176 | temp = read8(SCI_SSR1) & ~SCI_TDRE; |
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177 | write8(temp, SCI_SSR1); |
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178 | result = TRUE; |
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179 | } |
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180 | return result; |
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181 | } /* wrtSCI1 */ |
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182 | |
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183 | /* polled output steers byte to selected port */ |
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184 | void sh_sci_outbyte_polled( |
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185 | rtems_device_minor_number minor, |
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186 | char ch ) |
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187 | { |
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188 | if (minor == 0) /* blocks until port ready */ |
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189 | while (wrtSCI0(ch) != TRUE); /* SCI0*/ |
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190 | else |
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191 | while (wrtSCI1(ch) != TRUE); /* SCI1*/ |
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192 | } /* sh_sci_outbyte_polled */ |
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193 | |
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194 | /* |
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195 | * Initial version calls polled output driver and blocks |
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196 | */ |
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197 | void outbyte( |
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198 | rtems_device_minor_number minor, |
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199 | char ch) |
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200 | { |
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201 | sh_sci_outbyte_polled(minor, (unsigned char)ch); |
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202 | } /* outbyte */ |
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203 | |
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204 | rtems_boolean rdSCI0(unsigned char *ch) |
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205 | { |
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206 | unsigned8 temp; |
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207 | rtems_boolean result=FALSE; |
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208 | |
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209 | if ((read8(SCI_SSR0) & SCI_RDRF) != 0x00) { |
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210 | /* read input */ |
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211 | *ch = read8(SCI_RDR0); |
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212 | /* Clear RDRF flag */ |
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213 | temp = read8(SCI_SSR0) & ~SCI_RDRF; |
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214 | write8(temp, SCI_SSR0); |
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215 | result = TRUE; |
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216 | } |
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217 | return result; |
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218 | } /* rdSCI0 */ |
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219 | |
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220 | rtems_boolean rdSCI1(unsigned char *ch) |
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221 | { |
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222 | unsigned8 temp; |
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223 | rtems_boolean result=FALSE; |
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224 | |
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225 | if ((read8(SCI_SSR1) & SCI_RDRF) != 0x00) { |
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226 | /* read input */ |
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227 | *ch = read8(SCI_RDR1); |
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228 | /* Clear RDRF flag */ |
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229 | temp= read8(SCI_SSR1) & ~SCI_RDRF; |
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230 | write8(temp, SCI_SSR1); |
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231 | result = TRUE; |
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232 | } |
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233 | return result; |
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234 | } /* rdSCI1 */ |
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235 | |
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236 | |
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237 | /* initial version pulls byte from selected port */ |
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238 | char sh_sci_inbyte_polled( |
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239 | rtems_device_minor_number minor ) |
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240 | { |
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241 | char ch; |
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242 | |
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243 | if (minor == 0) /* blocks until char.ready */ |
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244 | while (rdSCI0(&ch) != TRUE); /* SCI0 */ |
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245 | else |
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246 | while (rdSCI1(&ch) != TRUE); /* SCI1 */ |
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247 | return ch; |
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248 | } /* sh_sci_inbyte_polled */ |
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249 | |
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250 | /* Initial version calls polled input driver */ |
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251 | char inbyte( |
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252 | rtems_device_minor_number minor ) |
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253 | { |
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254 | char ch; |
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255 | |
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256 | ch = sh_sci_inbyte_polled(minor); |
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257 | return ch; |
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258 | } /* inbyte */ |
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259 | |
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260 | |
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261 | /* sh_sci_initialize |
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262 | * |
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263 | * This routine initializes (registers) the sh_sci IO drivers. |
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264 | * |
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265 | * Input parameters: ignored |
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266 | * |
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267 | * Output parameters: NONE |
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268 | * |
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269 | * Return values: RTEMS_SUCCESSFUL |
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270 | * if all sci[...] register, else calls |
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271 | * rtems_fatal_error_occurred(status) |
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272 | * |
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273 | */ |
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274 | |
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275 | rtems_device_driver sh_sci_initialize( |
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276 | rtems_device_major_number major, |
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277 | rtems_device_minor_number minor, |
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278 | void *arg ) |
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279 | { |
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280 | rtems_device_driver status ; |
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281 | rtems_device_minor_number i; |
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282 | |
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283 | /* |
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284 | * register all possible devices. |
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285 | * the initialization of the hardware is done by sci_open |
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286 | */ |
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287 | |
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288 | for ( i = 0 ; i < SCI_MINOR_DEVICES ; i++ ) |
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289 | { |
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290 | status = rtems_io_register_name( |
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291 | sci_device[i].name, |
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292 | major, |
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293 | sci_device[i].minor ); |
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294 | if (status != RTEMS_SUCCESSFUL) |
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295 | rtems_fatal_error_occurred(status); |
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296 | } |
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297 | |
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298 | /* non-default hardware setup occurs in sh_sci_open() */ |
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299 | |
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300 | return RTEMS_SUCCESSFUL; |
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301 | } |
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302 | |
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303 | |
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304 | /* |
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305 | * Open entry point |
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306 | * Sets up port and pins for selected sci. |
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307 | * SCI0 setup is conditional on STANDALONE_EVB == 1 |
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308 | */ |
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309 | |
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310 | rtems_device_driver sh_sci_open( |
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311 | rtems_device_major_number major, |
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312 | rtems_device_minor_number minor, |
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313 | void * arg ) |
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314 | { |
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315 | unsigned8 temp8; |
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316 | unsigned16 temp16; |
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317 | |
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318 | unsigned a ; |
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319 | |
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320 | /* check for valid minor number */ |
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321 | if(( minor > ( SCI_MINOR_DEVICES -1 )) || ( minor < 0 )) |
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322 | { |
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323 | return RTEMS_INVALID_NUMBER; |
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324 | } |
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325 | |
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326 | /* device already opened */ |
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327 | if ( sci_device[minor].opened > 0 ) |
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328 | { |
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329 | sci_device[minor].opened++ ; |
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330 | return RTEMS_SUCCESSFUL ; |
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331 | } |
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332 | |
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333 | /* enable I/O pins */ |
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334 | |
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335 | if ((minor == 0) && (STANDALONE_EVB == 1)) { |
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336 | temp16 = read16(PFC_PACRL2) & /* disable SCK0, Tx0, Rx0 */ |
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337 | ~(PA2MD1 | PA2MD0 | PA1MD0 | PA0MD0); |
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338 | temp16 |= (PA_TXD0 | PA_RXD0); /* assign pins for Tx0, Rx0 */ |
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339 | write16(temp16, PFC_PACRL2); |
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340 | |
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341 | } else if (minor == 1) { |
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342 | temp16 = read16(PFC_PACRL2) & /* disable SCK1, Tx1, Rx1 */ |
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343 | ~(PA5MD1 | PA5MD0 | PA4MD0 | PA3MD0); |
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344 | temp16 |= (PA_TXD1 | PA_RXD1); /* assign pins for Tx1, Rx1 */ |
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345 | write16(temp16, PFC_PACRL2); |
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346 | |
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347 | } /* add other devices and pins as req'd. */ |
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348 | |
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349 | /* set up SCI registers */ |
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350 | if ((minor != 0) || (STANDALONE_EVB == 1)) { |
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351 | write8(0x00, sci_device[minor].addr + SCI_SCR); /* Clear SCR */ |
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352 | /* set SCR and BRR */ |
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353 | _sci_set_cflags( &sci_device[minor], sci_device[minor].cflags ); |
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354 | |
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355 | for(a=0; a < 10000L; a++) { /* One-bit delay */ |
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356 | asm volatile ("nop"); |
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357 | } |
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358 | |
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359 | write8((SCI_RE | SCI_TE), /* enable async. Tx and Rx */ |
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360 | sci_device[minor].addr + SCI_SCR); |
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361 | temp8 = read8(sci_device[minor].addr + SCI_RDR); /* flush input */ |
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362 | |
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363 | /* add interrupt setup if required */ |
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364 | |
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365 | } |
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366 | |
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367 | sci_device[minor].opened++ ; |
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368 | |
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369 | return RTEMS_SUCCESSFUL ; |
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370 | } |
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371 | |
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372 | /* |
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373 | * Close entry point |
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374 | */ |
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375 | |
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376 | rtems_device_driver sh_sci_close( |
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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 | /* FIXME: Incomplete */ |
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383 | if ( sci_device[minor].opened > 0 ) |
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384 | sci_device[minor].opened-- ; |
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385 | else |
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386 | return RTEMS_INVALID_NUMBER ; |
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387 | |
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388 | return RTEMS_SUCCESSFUL ; |
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389 | } |
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390 | |
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391 | /* |
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392 | * read bytes from the serial port. We only have stdin. |
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393 | */ |
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394 | |
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395 | rtems_device_driver sh_sci_read( |
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396 | rtems_device_major_number major, |
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397 | rtems_device_minor_number minor, |
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398 | void * arg |
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399 | ) |
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400 | { |
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401 | rtems_libio_rw_args_t *rw_args; |
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402 | char *buffer; |
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403 | int maximum; |
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404 | int count = 0; |
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405 | |
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406 | rw_args = (rtems_libio_rw_args_t *) arg; |
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407 | |
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408 | buffer = rw_args->buffer; |
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409 | maximum = rw_args->count; |
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410 | |
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411 | for (count = 0; count < maximum; count++) { |
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412 | buffer[ count ] = inbyte(minor); |
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413 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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414 | buffer[ count++ ] = '\n'; |
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415 | break; |
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416 | } |
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417 | } |
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418 | |
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419 | rw_args->bytes_moved = count; |
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420 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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421 | } |
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422 | |
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423 | /* |
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424 | * write bytes to the serial port. Stdout and stderr are the same. |
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425 | */ |
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426 | |
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427 | rtems_device_driver sh_sci_write( |
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428 | rtems_device_major_number major, |
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429 | rtems_device_minor_number minor, |
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430 | void * arg |
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431 | ) |
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432 | { |
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433 | int count; |
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434 | int maximum; |
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435 | rtems_libio_rw_args_t *rw_args; |
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436 | char *buffer; |
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437 | |
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438 | rw_args = (rtems_libio_rw_args_t *) arg; |
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439 | |
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440 | buffer = rw_args->buffer; |
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441 | maximum = rw_args->count; |
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442 | |
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443 | for (count = 0; count < maximum; count++) { |
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444 | if ( buffer[ count ] == '\n') { |
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445 | outbyte(minor, '\r'); |
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446 | } |
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447 | outbyte( minor, buffer[ count ] ); |
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448 | } |
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449 | |
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450 | rw_args->bytes_moved = maximum; |
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451 | return 0; |
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452 | } |
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453 | |
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454 | /* |
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455 | * IO Control entry point |
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456 | */ |
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457 | |
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458 | rtems_device_driver sh_sci_control( |
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459 | rtems_device_major_number major, |
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460 | rtems_device_minor_number minor, |
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461 | void * arg |
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462 | ) |
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463 | { |
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464 | /* Not yet supported */ |
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465 | return RTEMS_SUCCESSFUL ; |
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466 | } |
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