1 | /*****************************************************************************/ |
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2 | /* |
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3 | $Id$ |
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4 | |
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5 | M68302 SCC Polled Driver |
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6 | |
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7 | */ |
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8 | /*****************************************************************************/ |
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9 | |
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10 | |
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11 | #include <bsp.h> |
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12 | #include <m68302.h> |
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13 | #include <m68302scc.h> |
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14 | |
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15 | #define M68302_SCC_COUNT (3) |
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16 | |
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17 | static volatile m302_SCC_t *scc[M68302_SCC_COUNT] = { 0, 0, 0 }; |
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18 | static volatile m302_SCC_Registers_t *scc_reg[M68302_SCC_COUNT] = { 0, 0, 0 }; |
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19 | static int scc_translate[M68302_SCC_COUNT] = { 0, 0, 0 }; |
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20 | |
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21 | static const rtems_unsigned16 baud_clocks[] = |
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22 | { |
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23 | (SYSTEM_CLOCK / ( 4800 * 16)), |
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24 | (SYSTEM_CLOCK / ( 9600 * 16)), |
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25 | (SYSTEM_CLOCK / ( 19200 * 16)), |
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26 | (SYSTEM_CLOCK / ( 38400 * 16)), |
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27 | (SYSTEM_CLOCK / ( 57600 * 16)), |
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28 | (SYSTEM_CLOCK / (115700 * 16)) |
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29 | }; |
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30 | |
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31 | void scc_initialise(int channel, int baud, int translate) |
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32 | { |
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33 | rtems_unsigned16 scon; |
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34 | |
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35 | if (channel < M68302_SCC_COUNT) |
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36 | { |
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37 | scc[channel] = &m302.scc1 + channel; |
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38 | scc_reg[channel] = &m302.reg.scc[channel]; |
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39 | scc_translate[channel] = translate; |
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40 | |
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41 | scon = (baud_clocks[baud] & 0xF800) == 0 ? 0 : 1; |
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42 | scon |= (((baud_clocks[baud] / (1 + scon * 3)) - 1) << 1) & 0x0FFE; |
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43 | |
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44 | scc_reg[channel]->scon = scon; |
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45 | scc_reg[channel]->scm = 0x0171; |
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46 | |
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47 | scc[channel]->bd.tx[0].status = 0x2000; |
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48 | scc[channel]->bd.tx[0].length = 0; |
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49 | scc[channel]->bd.tx[0].buffer = |
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50 | (rtems_unsigned8*) &(scc[channel]->bd.tx[1].buffer); |
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51 | |
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52 | scc[channel]->bd.rx[0].status = 0x2000; |
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53 | scc[channel]->bd.rx[0].length = 0; |
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54 | scc[channel]->bd.rx[0].buffer = |
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55 | (rtems_unsigned8*) &(scc[channel]->bd.rx[1].buffer); |
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56 | |
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57 | scc[channel]->parm.rfcr = 0x50; |
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58 | scc[channel]->parm.tfcr = 0x50; |
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59 | |
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60 | scc[channel]->parm.mrblr = 0x0001; |
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61 | scc[channel]->prot.uart.max_idl = 0x0004; |
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62 | scc[channel]->prot.uart.brkcr = 1; |
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63 | scc[channel]->prot.uart.parec = 0; |
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64 | scc[channel]->prot.uart.frmec = 0; |
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65 | scc[channel]->prot.uart.nosec = 0; |
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66 | scc[channel]->prot.uart.brkec = 0; |
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67 | scc[channel]->prot.uart.uaddr1 = 0; |
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68 | scc[channel]->prot.uart.uaddr2 = 0; |
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69 | scc[channel]->prot.uart.character[0] = 0x0003; |
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70 | scc[channel]->prot.uart.character[1] = 0x8000; |
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71 | |
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72 | scc_reg[channel]->scce = 0xFF; |
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73 | scc_reg[channel]->sccm = 0x15; |
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74 | |
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75 | scc_reg[channel]->scm = 0x17d; |
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76 | } |
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77 | } |
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78 | |
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79 | unsigned char scc_status(int channel, unsigned char status) |
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80 | { |
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81 | rtems_unsigned16 rx_status; |
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82 | |
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83 | m302.reg.wcn = 0; |
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84 | |
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85 | if ((channel < M68302_SCC_COUNT) && scc[channel]) |
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86 | { |
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87 | rx_status = scc[channel]->bd.rx[0].status; |
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88 | |
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89 | if ((rx_status & 0x8000) == 0) |
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90 | { |
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91 | if (rx_status & 0x003B) |
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92 | { |
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93 | return 2; |
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94 | } |
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95 | if (status == 0) |
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96 | { |
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97 | return 1; |
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98 | } |
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99 | } |
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100 | } |
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101 | |
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102 | return 0; |
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103 | } |
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104 | |
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105 | unsigned char scc_in(int channel) |
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106 | { |
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107 | m302.reg.wcn = 0; |
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108 | |
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109 | if ((channel < M68302_SCC_COUNT) && scc[channel]) |
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110 | { |
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111 | if ((scc[channel]->bd.rx[0].status & 0x8000) == 0) |
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112 | { |
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113 | unsigned char c; |
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114 | |
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115 | c = *(scc[channel]->bd.rx[0].buffer); |
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116 | |
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117 | scc[channel]->bd.rx[0].status = 0xa000; |
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118 | |
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119 | return c; |
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120 | } |
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121 | } |
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122 | |
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123 | return 0; |
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124 | } |
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125 | |
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126 | void scc_out(int channel, unsigned char character) |
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127 | { |
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128 | if ((channel < M68302_SCC_COUNT) && scc[channel]) |
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129 | { |
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130 | do |
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131 | { |
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132 | m302.reg.wcn = 0; |
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133 | } |
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134 | while (scc[channel]->bd.tx[0].status & 0x8000); |
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135 | |
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136 | *(scc[channel]->bd.tx[0].buffer) = character; |
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137 | |
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138 | scc[channel]->bd.tx[0].length = 1; |
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139 | scc[channel]->bd.tx[0].status = 0xa000; |
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140 | |
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141 | if (scc_translate[channel]) |
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142 | { |
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143 | if (character == '\n') |
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144 | { |
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145 | scc_out(channel, '\r'); |
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146 | } |
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147 | } |
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148 | } |
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149 | } |
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150 | |
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151 | |
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152 | |
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157 | |
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158 | |
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159 | |
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