1 | /* |
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2 | * Generic UART Serial driver for Motorola Coldfire processors |
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3 | * |
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4 | * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russian Fed. |
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5 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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6 | * |
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7 | * COPYRIGHT (c) 1989-2000. |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | * |
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15 | * $Id$ |
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16 | * |
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17 | */ |
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18 | |
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19 | #include <rtems.h> |
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20 | #include <termios.h> |
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21 | #include <rtems/libio.h> |
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22 | #include "mcf5206/mcfuart.h" |
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23 | |
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24 | /* |
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25 | * int_driven_uart -- mapping between interrupt vector number and |
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26 | * UART descriptor structures |
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27 | */ |
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28 | static struct { |
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29 | mcfuart *uart; |
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30 | int vec; |
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31 | } int_driven_uart[2]; |
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32 | |
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33 | /* Forward function declarations */ |
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34 | static rtems_isr |
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35 | mcfuart_interrupt_handler(rtems_vector_number vec); |
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36 | |
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37 | /* |
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38 | * mcfuart_init -- |
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39 | * This function verifies the input parameters and perform initialization |
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40 | * of the Motorola Coldfire on-chip UART descriptor structure. |
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41 | * |
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42 | * PARAMETERS: |
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43 | * uart - pointer to the UART channel descriptor structure |
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44 | * tty - pointer to termios structure |
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45 | * int_driven - interrupt-driven (1) or polled (0) I/O mode |
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46 | * chn - channel number (0/1) |
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47 | * rx_buf - pointer to receive buffer |
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48 | * rx_buf_len - receive buffer length |
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49 | * |
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50 | * RETURNS: |
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51 | * RTEMS_SUCCESSFUL if all parameters are valid, or error code |
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52 | */ |
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53 | rtems_status_code |
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54 | mcfuart_init(mcfuart *uart, void *tty, uint8_t intvec, |
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55 | uint32_t chn) |
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56 | { |
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57 | if (uart == NULL) |
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58 | return RTEMS_INVALID_ADDRESS; |
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59 | |
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60 | if ((chn <= 0) || (chn > MCF5206E_UART_CHANNELS)) |
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61 | return RTEMS_INVALID_NUMBER; |
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62 | |
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63 | uart->chn = chn; |
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64 | uart->intvec = intvec; |
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65 | uart->tty = tty; |
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66 | |
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67 | return RTEMS_SUCCESSFUL; |
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68 | } |
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69 | |
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70 | /* mcfuart_set_baudrate -- |
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71 | * Program the UART timer to specified baudrate |
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72 | * |
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73 | * PARAMETERS: |
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74 | * uart - pointer to UART descriptor structure |
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75 | * baud - termios baud rate (B50, B9600, etc...) |
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76 | * |
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77 | * RETURNS: |
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78 | * none |
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79 | */ |
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80 | static void |
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81 | mcfuart_set_baudrate(mcfuart *uart, speed_t baud) |
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82 | { |
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83 | uint32_t div; |
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84 | uint32_t rate; |
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85 | switch (baud) |
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86 | { |
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87 | case B50: rate = 50; break; |
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88 | case B75: rate = 75; break; |
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89 | case B110: rate = 110; break; |
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90 | case B134: rate = 134; break; |
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91 | case B150: rate = 150; break; |
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92 | case B200: rate = 200; break; |
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93 | case B300: rate = 300; break; |
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94 | case B600: rate = 600; break; |
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95 | case B1200: rate = 1200; break; |
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96 | case B2400: rate = 2400; break; |
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97 | case B4800: rate = 4800; break; |
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98 | case B9600: rate = 9600; break; |
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99 | case B19200: rate = 19200; break; |
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100 | case B38400: rate = 38400; break; |
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101 | case B57600: rate = 57600; break; |
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102 | #ifdef B115200 |
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103 | case B115200: rate = 115200; break; |
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104 | #endif |
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105 | #ifdef B230400 |
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106 | case B230400: rate = 230400; break; |
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107 | #endif |
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108 | default: rate = 9600; break; |
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109 | } |
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110 | |
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111 | div = SYSTEM_CLOCK_FREQUENCY / (rate * 32); |
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112 | |
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113 | *MCF5206E_UBG1(MBAR,uart->chn) = (uint8_t)((div >> 8) & 0xff); |
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114 | *MCF5206E_UBG2(MBAR,uart->chn) = (uint8_t)(div & 0xff); |
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115 | } |
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116 | |
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117 | /* |
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118 | * mcfuart_reset -- |
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119 | * This function perform the hardware initialization of Motorola |
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120 | * Coldfire processor on-chip UART controller using parameters |
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121 | * filled by the mcfuart_init function. |
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122 | * |
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123 | * PARAMETERS: |
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124 | * uart - pointer to UART channel descriptor structure |
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125 | * |
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126 | * RETURNS: |
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127 | * RTEMS_SUCCESSFUL if channel is initialized successfully, error |
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128 | * code in other case |
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129 | * |
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130 | * ALGORITHM: |
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131 | * This function in general follows to algorith described in MCF5206e |
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132 | * User's Manual, 12.5 UART Module Initialization Sequence |
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133 | */ |
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134 | rtems_status_code |
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135 | mcfuart_reset(mcfuart *uart) |
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136 | { |
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137 | register uint32_t chn; |
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138 | rtems_status_code rc; |
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139 | |
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140 | if (uart == NULL) |
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141 | return RTEMS_INVALID_ADDRESS; |
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142 | |
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143 | chn = uart->chn; |
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144 | |
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145 | /* Reset the receiver and transmitter */ |
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146 | *MCF5206E_UCR(MBAR,chn) = MCF5206E_UCR_MISC_RESET_RX; |
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147 | *MCF5206E_UCR(MBAR,chn) = MCF5206E_UCR_MISC_RESET_TX; |
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148 | |
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149 | /* |
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150 | * Program the vector number for a UART module interrupt, or |
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151 | * disable UART interrupts if polled I/O. Enable the desired |
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152 | * interrupt sources. |
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153 | */ |
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154 | if (uart->intvec != 0) |
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155 | { |
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156 | int_driven_uart[chn - 1].uart = uart; |
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157 | int_driven_uart[chn - 1].vec = uart->intvec; |
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158 | rc = rtems_interrupt_catch(mcfuart_interrupt_handler, uart->intvec, |
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159 | &uart->old_handler); |
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160 | if (rc != RTEMS_SUCCESSFUL) |
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161 | return rc; |
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162 | *MCF5206E_UIVR(MBAR,chn) = uart->intvec; |
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163 | *MCF5206E_UIMR(MBAR,chn) = MCF5206E_UIMR_FFULL; |
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164 | *MCF5206E_UACR(MBAR,chn) = MCF5206E_UACR_IEC; |
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165 | *MCF5206E_IMR(MBAR) &= ~MCF5206E_INTR_BIT(uart->chn == 1 ? |
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166 | MCF5206E_INTR_UART_1 : |
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167 | MCF5206E_INTR_UART_2); |
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168 | } |
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169 | else |
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170 | { |
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171 | *MCF5206E_UIMR(MBAR,chn) = 0; |
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172 | } |
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173 | |
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174 | /* Select the receiver and transmitter clock. */ |
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175 | mcfuart_set_baudrate(uart, B19200); /* dBUG defaults (unfortunately, |
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176 | it is differ to termios default */ |
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177 | *MCF5206E_UCSR(MBAR,chn) = |
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178 | MCF5206E_UCSR_RCS_TIMER | MCF5206E_UCSR_TCS_TIMER; |
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179 | |
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180 | /* Mode Registers 1,2 - set termios defaults (8N1) */ |
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181 | *MCF5206E_UCR(MBAR,chn) = MCF5206E_UCR_MISC_RESET_MR; |
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182 | *MCF5206E_UMR(MBAR,chn) = |
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183 | /* MCF5206E_UMR1_RXRTS | */ |
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184 | MCF5206E_UMR1_PM_NO_PARITY | |
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185 | MCF5206E_UMR1_BC_8; |
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186 | *MCF5206E_UMR(MBAR,chn) = |
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187 | MCF5206E_UMR2_CM_NORMAL | |
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188 | /* MCF5206E_UMR2_TXCTS | */ |
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189 | MCF5206E_UMR2_SB_1; |
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190 | |
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191 | /* Enable Receiver and Transmitter */ |
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192 | *MCF5206E_UCR(MBAR,chn) = MCF5206E_UCR_MISC_RESET_ERR; |
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193 | *MCF5206E_UCR(MBAR,chn) = MCF5206E_UCR_TC_ENABLE; |
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194 | *MCF5206E_UCR(MBAR,chn) = MCF5206E_UCR_RC_ENABLE; |
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195 | |
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196 | return RTEMS_SUCCESSFUL; |
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197 | } |
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198 | |
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199 | /* |
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200 | * mcfuart_disable -- |
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201 | * This function disable the operations on Motorola Coldfire UART |
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202 | * controller |
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203 | * |
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204 | * PARAMETERS: |
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205 | * uart - pointer to UART channel descriptor structure |
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206 | * |
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207 | * RETURNS: |
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208 | * RTEMS_SUCCESSFUL if UART closed successfuly, or error code in |
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209 | * other case |
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210 | */ |
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211 | rtems_status_code |
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212 | mcfuart_disable(mcfuart *uart) |
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213 | { |
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214 | rtems_status_code rc; |
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215 | *MCF5206E_UCR(MBAR,uart->chn) = |
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216 | MCF5206E_UCR_TC_DISABLE | |
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217 | MCF5206E_UCR_RC_DISABLE; |
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218 | if (uart->intvec != 0) |
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219 | { |
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220 | *MCF5206E_IMR(MBAR) |= MCF5206E_INTR_BIT(uart->chn == 1 ? |
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221 | MCF5206E_INTR_UART_1 : |
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222 | MCF5206E_INTR_UART_2); |
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223 | rc = rtems_interrupt_catch(uart->old_handler, uart->intvec, NULL); |
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224 | int_driven_uart[uart->chn - 1].uart = NULL; |
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225 | int_driven_uart[uart->chn - 1].vec = 0; |
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226 | if (rc != RTEMS_SUCCESSFUL) |
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227 | return rc; |
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228 | } |
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229 | return RTEMS_SUCCESSFUL; |
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230 | } |
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231 | |
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232 | /* |
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233 | * mcfuart_set_attributes -- |
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234 | * This function parse the termios attributes structure and perform |
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235 | * the appropriate settings in hardware. |
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236 | * |
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237 | * PARAMETERS: |
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238 | * uart - pointer to the UART descriptor structure |
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239 | * t - pointer to termios parameters |
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240 | * |
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241 | * RETURNS: |
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242 | * RTEMS_SUCCESSFUL |
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243 | */ |
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244 | int |
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245 | mcfuart_set_attributes(mcfuart *uart, const struct termios *t) |
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246 | { |
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247 | int level; |
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248 | speed_t baud; |
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249 | uint8_t umr1, umr2; |
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250 | |
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251 | baud = cfgetospeed(t); |
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252 | umr1 = 0; |
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253 | umr2 = MCF5206E_UMR2_CM_NORMAL; |
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254 | |
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255 | /* Set flow control */ |
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256 | if ((t->c_cflag & CRTSCTS) != 0) |
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257 | { |
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258 | umr1 |= MCF5206E_UMR1_RXRTS; |
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259 | umr2 |= MCF5206E_UMR2_TXCTS; |
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260 | } |
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261 | |
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262 | /* Set character size */ |
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263 | switch (t->c_cflag & CSIZE) |
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264 | { |
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265 | case CS5: umr1 |= MCF5206E_UMR1_BC_5; break; |
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266 | case CS6: umr1 |= MCF5206E_UMR1_BC_6; break; |
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267 | case CS7: umr1 |= MCF5206E_UMR1_BC_7; break; |
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268 | case CS8: umr1 |= MCF5206E_UMR1_BC_8; break; |
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269 | } |
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270 | |
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271 | /* Set number of stop bits */ |
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272 | if ((t->c_cflag & CSTOPB) != 0) |
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273 | { |
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274 | if ((t->c_cflag & CSIZE) == CS5) |
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275 | { |
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276 | umr2 |= MCF5206E_UMR2_SB5_2; |
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277 | } |
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278 | else |
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279 | { |
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280 | umr2 |= MCF5206E_UMR2_SB_2; |
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281 | } |
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282 | } |
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283 | else |
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284 | { |
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285 | if ((t->c_cflag & CSIZE) == CS5) |
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286 | { |
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287 | umr2 |= MCF5206E_UMR2_SB5_1; |
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288 | } |
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289 | else |
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290 | { |
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291 | umr2 |= MCF5206E_UMR2_SB_1; |
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292 | } |
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293 | } |
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294 | |
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295 | /* Set parity mode */ |
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296 | if ((t->c_cflag & PARENB) != 0) |
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297 | { |
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298 | if ((t->c_cflag & PARODD) != 0) |
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299 | { |
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300 | umr1 |= MCF5206E_UMR1_PM_ODD; |
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301 | } |
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302 | else |
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303 | { |
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304 | umr1 |= MCF5206E_UMR1_PM_EVEN; |
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305 | } |
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306 | } |
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307 | else |
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308 | { |
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309 | umr1 |= MCF5206E_UMR1_PM_NO_PARITY; |
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310 | } |
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311 | |
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312 | rtems_interrupt_disable(level); |
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313 | *MCF5206E_UCR(MBAR,uart->chn) = |
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314 | MCF5206E_UCR_TC_DISABLE | MCF5206E_UCR_RC_DISABLE; |
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315 | mcfuart_set_baudrate(uart, baud); |
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316 | *MCF5206E_UCR(MBAR,uart->chn) = MCF5206E_UCR_MISC_RESET_MR; |
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317 | *MCF5206E_UMR(MBAR,uart->chn) = umr1; |
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318 | *MCF5206E_UMR(MBAR,uart->chn) = umr2; |
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319 | if ((t->c_cflag & CREAD) != 0) |
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320 | { |
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321 | *MCF5206E_UCR(MBAR,uart->chn) = |
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322 | MCF5206E_UCR_TC_ENABLE | MCF5206E_UCR_RC_ENABLE; |
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323 | } |
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324 | else |
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325 | { |
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326 | *MCF5206E_UCR(MBAR,uart->chn) = MCF5206E_UCR_TC_ENABLE; |
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327 | } |
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328 | rtems_interrupt_enable(level); |
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329 | |
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330 | return RTEMS_SUCCESSFUL; |
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331 | } |
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332 | |
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333 | /* |
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334 | * mcfuart_poll_read -- |
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335 | * This function tried to read character from MCF UART and perform |
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336 | * error handling. When parity or framing error occured, return |
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337 | * value dependent on termios input mode flags: |
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338 | * - received character, if IGNPAR == 1 |
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339 | * - 0, if IGNPAR == 0 and PARMRK == 0 |
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340 | * - 0xff and 0x00 on next poll_read invocation, if IGNPAR == 0 and |
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341 | * PARMRK == 1 |
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342 | * |
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343 | * PARAMETERS: |
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344 | * uart - pointer to UART descriptor structure |
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345 | * |
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346 | * RETURNS: |
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347 | * code of received character or -1 if no characters received. |
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348 | */ |
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349 | int |
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350 | mcfuart_poll_read(mcfuart *uart) |
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351 | { |
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352 | uint8_t usr; |
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353 | int ch; |
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354 | if (uart->parerr_mark_flag == 1) |
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355 | { |
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356 | uart->parerr_mark_flag = 0; |
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357 | return 0; |
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358 | } |
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359 | usr = *MCF5206E_USR(MBAR,uart->chn); |
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360 | if ((usr & MCF5206E_USR_RXRDY) != 0) |
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361 | { |
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362 | if (((usr & (MCF5206E_USR_FE | MCF5206E_USR_PE)) != 0) && |
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363 | !(uart->c_iflag & IGNPAR)) |
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364 | { |
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365 | ch = *MCF5206E_URB(MBAR,uart->chn); /* Clear error bits */ |
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366 | if (uart->c_iflag & PARMRK) |
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367 | { |
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368 | uart->parerr_mark_flag = 1; |
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369 | ch = 0xff; |
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370 | } |
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371 | else |
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372 | { |
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373 | ch = 0; |
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374 | } |
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375 | } |
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376 | else |
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377 | { |
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378 | ch = *MCF5206E_URB(MBAR,uart->chn); |
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379 | } |
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380 | } |
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381 | else |
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382 | ch = -1; |
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383 | return ch; |
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384 | } |
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385 | |
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386 | /* |
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387 | * mcfuart_poll_write -- |
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388 | * This function transmit buffer byte-by-byte in polling mode. |
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389 | * |
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390 | * PARAMETERS: |
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391 | * uart - pointer to the UART descriptor structure |
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392 | * buf - pointer to transmit buffer |
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393 | * len - transmit buffer length |
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394 | * |
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395 | * RETURNS: |
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396 | * 0 |
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397 | */ |
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398 | int |
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399 | mcfuart_poll_write(mcfuart *uart, const char *buf, int len) |
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400 | { |
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401 | while (len--) |
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402 | { |
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403 | while ((*MCF5206E_USR(MBAR, uart->chn) & MCF5206E_USR_TXRDY) == 0); |
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404 | *MCF5206E_UTB(MBAR, uart->chn) = *buf++; |
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405 | } |
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406 | return 0; |
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407 | } |
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408 | |
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409 | /* mcfuart_interrupt_handler -- |
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410 | * UART interrupt handler routine |
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411 | * |
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412 | * PARAMETERS: |
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413 | * vec - interrupt vector number |
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414 | * |
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415 | * RETURNS: |
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416 | * none |
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417 | */ |
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418 | static rtems_isr |
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419 | mcfuart_interrupt_handler(rtems_vector_number vec) |
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420 | { |
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421 | mcfuart *uart; |
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422 | register uint8_t usr; |
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423 | register uint8_t uisr; |
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424 | register int chn; |
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425 | register int bp = 0; |
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426 | |
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427 | /* Find UART descriptor from vector number */ |
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428 | if (int_driven_uart[0].vec == vec) |
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429 | uart = int_driven_uart[0].uart; |
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430 | else if (int_driven_uart[1].vec == vec) |
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431 | uart = int_driven_uart[1].uart; |
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432 | else |
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433 | return; |
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434 | |
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435 | chn = uart->chn; |
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436 | |
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437 | uisr = *MCF5206E_UISR(MBAR, chn); |
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438 | if (uisr & MCF5206E_UISR_DB) |
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439 | { |
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440 | *MCF5206E_UCR(MBAR, chn) = MCF5206E_UCR_MISC_RESET_BRK; |
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441 | } |
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442 | |
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443 | /* Receiving */ |
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444 | while (1) |
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445 | { |
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446 | char buf[32]; |
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447 | usr = *MCF5206E_USR(MBAR,chn); |
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448 | if ((bp < sizeof(buf) - 1) && ((usr & MCF5206E_USR_RXRDY) != 0)) |
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449 | { |
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450 | /* Receive character and handle frame/parity errors */ |
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451 | if (((usr & (MCF5206E_USR_FE | MCF5206E_USR_PE)) != 0) && |
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452 | !(uart->c_iflag & IGNPAR)) |
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453 | { |
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454 | if (uart->c_iflag & PARMRK) |
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455 | { |
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456 | buf[bp++] = 0xff; |
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457 | buf[bp++] = 0x00; |
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458 | } |
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459 | else |
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460 | { |
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461 | buf[bp++] = 0x00; |
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462 | } |
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463 | } |
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464 | else |
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465 | { |
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466 | buf[bp++] = *MCF5206E_URB(MBAR, chn); |
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467 | } |
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468 | |
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469 | /* Reset error condition if any errors has been detected */ |
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470 | if (usr & (MCF5206E_USR_RB | MCF5206E_USR_FE | |
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471 | MCF5206E_USR_PE | MCF5206E_USR_OE)) |
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472 | { |
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473 | *MCF5206E_UCR(MBAR, chn) = MCF5206E_UCR_MISC_RESET_ERR; |
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474 | } |
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475 | } |
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476 | else |
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477 | { |
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478 | if (bp != 0) |
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479 | rtems_termios_enqueue_raw_characters(uart->tty, buf, bp); |
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480 | break; |
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481 | } |
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482 | } |
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483 | |
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484 | /* Transmitting */ |
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485 | while (1) |
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486 | { |
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487 | if ((*MCF5206E_USR(MBAR, chn) & MCF5206E_USR_TXRDY) == 0) |
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488 | break; |
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489 | if (uart->tx_buf != NULL) |
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490 | { |
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491 | if (uart->tx_ptr >= uart->tx_buf_len) |
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492 | { |
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493 | register int dequeue = uart->tx_buf_len; |
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494 | *MCF5206E_UIMR(MBAR, uart->chn) = MCF5206E_UIMR_FFULL; |
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495 | uart->tx_buf = NULL; |
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496 | uart->tx_ptr = uart->tx_buf_len = 0; |
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497 | rtems_termios_dequeue_characters(uart->tty, dequeue); |
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498 | } |
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499 | else |
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500 | { |
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501 | *MCF5206E_UTB(MBAR, chn) = uart->tx_buf[uart->tx_ptr++]; |
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502 | } |
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503 | } |
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504 | else |
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505 | break; |
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506 | } |
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507 | } |
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508 | |
---|
509 | /* mcfuart_interrupt_write -- |
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510 | * This function initiate transmitting of the buffer in interrupt mode. |
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511 | * |
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512 | * PARAMETERS: |
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513 | * uart - pointer to the UART descriptor structure |
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514 | * buf - pointer to transmit buffer |
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515 | * len - transmit buffer length |
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516 | * |
---|
517 | * RETURNS: |
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518 | * 0 |
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519 | */ |
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520 | int |
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521 | mcfuart_interrupt_write(mcfuart *uart, const char *buf, int len) |
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522 | { |
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523 | int level; |
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524 | rtems_interrupt_disable(level); |
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525 | uart->tx_buf = buf; |
---|
526 | uart->tx_buf_len = len; |
---|
527 | uart->tx_ptr = 0; |
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528 | *MCF5206E_UIMR(MBAR, uart->chn) = |
---|
529 | MCF5206E_UIMR_FFULL | MCF5206E_UIMR_TXRDY; |
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530 | while (((*MCF5206E_USR(MBAR,uart->chn) & MCF5206E_USR_TXRDY) != 0) && |
---|
531 | (uart->tx_ptr < uart->tx_buf_len)) |
---|
532 | { |
---|
533 | *MCF5206E_UTB(MBAR,uart->chn) = uart->tx_buf[uart->tx_ptr++]; |
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534 | } |
---|
535 | rtems_interrupt_enable(level); |
---|
536 | return 0; |
---|
537 | } |
---|
538 | |
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539 | /* mcfuart_stop_remote_tx -- |
---|
540 | * This function stop data flow from remote device. |
---|
541 | * |
---|
542 | * PARAMETERS: |
---|
543 | * uart - pointer to the UART descriptor structure |
---|
544 | * |
---|
545 | * RETURNS: |
---|
546 | * RTEMS_SUCCESSFUL |
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547 | */ |
---|
548 | int |
---|
549 | mcfuart_stop_remote_tx(mcfuart *uart) |
---|
550 | { |
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551 | *MCF5206E_UOP0(MBAR, uart->chn) = 1; |
---|
552 | return RTEMS_SUCCESSFUL; |
---|
553 | } |
---|
554 | |
---|
555 | /* mcfuart_start_remote_tx -- |
---|
556 | * This function resume data flow from remote device. |
---|
557 | * |
---|
558 | * PARAMETERS: |
---|
559 | * uart - pointer to the UART descriptor structure |
---|
560 | * |
---|
561 | * RETURNS: |
---|
562 | * RTEMS_SUCCESSFUL |
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563 | */ |
---|
564 | int |
---|
565 | mcfuart_start_remote_tx(mcfuart *uart) |
---|
566 | { |
---|
567 | *MCF5206E_UOP1(MBAR, uart->chn) = 1; |
---|
568 | return RTEMS_SUCCESSFUL; |
---|
569 | } |
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