1 | /** |
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2 | * @file tms570-sci.c |
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3 | * |
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4 | * @ingroup tms570 |
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5 | * |
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6 | * @brief Serial communication interface (SCI) functions definitions. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2014 Premysl Houdek <kom541000@gmail.com> |
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11 | * |
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12 | * Google Summer of Code 2014 at |
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13 | * Czech Technical University in Prague |
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14 | * Zikova 1903/4 |
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15 | * 166 36 Praha 6 |
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16 | * Czech Republic |
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17 | * |
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18 | * Based on LPC24xx and LPC1768 BSP |
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19 | * by embedded brains GmbH and others |
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20 | * |
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21 | * The license and distribution terms for this file may be |
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22 | * found in the file LICENSE in this distribution or at |
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23 | * http://www.rtems.org/license/LICENSE. |
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24 | */ |
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25 | |
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26 | #include <bspopts.h> |
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27 | #include <termios.h> |
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28 | #include <rtems/termiostypes.h> |
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29 | #include <bsp/tms570-sci.h> |
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30 | #include <bsp/tms570-sci-driver.h> |
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31 | #include <rtems/console.h> |
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32 | #include <bsp.h> |
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33 | #include <bsp/fatal.h> |
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34 | #include <bsp/irq.h> |
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35 | |
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36 | #define TMS570_SCI_BUFFER_SIZE 1 |
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37 | |
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38 | /** |
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39 | * @brief Table including all serial drivers |
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40 | * |
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41 | * Definitions of all serial drivers |
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42 | */ |
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43 | tms570_sci_context driver_context_table[] = { |
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44 | { |
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45 | .base = RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER("TMS570 SCI1"), |
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46 | .device_name = "/dev/console", |
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47 | /* TMS570 UART peripheral use subset of LIN registers which are equivalent |
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48 | * to SCI ones |
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49 | */ |
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50 | .regs = (volatile tms570_sci_t *) &TMS570_LIN, |
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51 | .irq = TMS570_IRQ_SCI_LEVEL_0, |
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52 | }, |
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53 | { |
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54 | .base = RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER("TMS570 SCI2"), |
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55 | .device_name = "/dev/ttyS1", |
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56 | .regs = &TMS570_SCI, |
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57 | .irq = TMS570_IRQ_SCI2_LEVEL_0, |
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58 | } |
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59 | }; |
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60 | |
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61 | /** |
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62 | * @brief Serial drivers init function |
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63 | * |
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64 | * Initialize all serial drivers specified in driver_context_table |
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65 | * |
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66 | * @param[in] major |
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67 | * @param[in] minor |
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68 | * @param[in] arg |
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69 | * @retval RTEMS_SUCCESSFUL Initialization completed |
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70 | */ |
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71 | rtems_device_driver console_initialize( |
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72 | rtems_device_major_number major, |
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73 | rtems_device_minor_number minor, |
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74 | void *arg |
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75 | ) |
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76 | { |
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77 | rtems_status_code sc; |
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78 | #if CONSOLE_USE_INTERRUPTS |
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79 | const rtems_termios_device_handler *handler = &tms570_sci_handler_interrupt; |
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80 | #else |
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81 | const rtems_termios_device_handler *handler = &tms570_sci_handler_polled; |
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82 | #endif |
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83 | |
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84 | /* |
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85 | * Initialize the Termios infrastructure. If Termios has already |
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86 | * been initialized by another device driver, then this call will |
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87 | * have no effect. |
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88 | */ |
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89 | rtems_termios_initialize(); |
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90 | |
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91 | /* Initialize each device */ |
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92 | for ( |
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93 | minor = 0; |
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94 | minor < RTEMS_ARRAY_SIZE(driver_context_table); |
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95 | ++minor |
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96 | ) { |
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97 | tms570_sci_context *ctx = &driver_context_table[minor]; |
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98 | |
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99 | /* |
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100 | * Install this device in the file system and Termios. In order |
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101 | * to use the console (i.e. being able to do printf, scanf etc. |
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102 | * on stdin, stdout and stderr), one device must be registered as |
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103 | * "/dev/console" (CONSOLE_DEVICE_NAME). |
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104 | */ |
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105 | sc = rtems_termios_device_install( |
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106 | ctx->device_name, |
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107 | major, |
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108 | minor, |
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109 | handler, |
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110 | NULL, |
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111 | &ctx->base |
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112 | ); |
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113 | if ( sc != RTEMS_SUCCESSFUL ) { |
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114 | bsp_fatal(BSP_FATAL_CONSOLE_NO_DEV); |
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115 | } |
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116 | } |
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117 | return RTEMS_SUCCESSFUL; |
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118 | } |
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119 | |
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120 | /** |
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121 | * @brief Reads chars from HW |
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122 | * |
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123 | * Reads chars from HW peripheral specified in driver context. |
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124 | * TMS570 does not have HW buffer for serial line so this function can |
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125 | * return only 0 or 1 char |
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126 | * |
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127 | * @param[in] ctx context of the driver |
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128 | * @param[out] buf read data buffer |
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129 | * @param[in] N size of buffer |
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130 | * @retval x Number of read chars from peripherals |
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131 | */ |
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132 | static int tms570_sci_read_received_chars( |
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133 | tms570_sci_context * ctx, |
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134 | char * buf, |
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135 | int N) |
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136 | { |
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137 | if ( N < 1 ) { |
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138 | return 0; |
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139 | } |
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140 | if ( ctx->regs->RD != 0 ) { |
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141 | buf[0] = ctx->regs->RD; |
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142 | return 1; |
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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 | * @brief Enables RX interrupt |
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149 | * |
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150 | * Enables RX interrupt source of SCI peripheral |
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151 | * specified in the driver context. |
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152 | * |
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153 | * @param[in] ctx context of the driver |
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154 | * @retval Void |
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155 | */ |
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156 | static void tms570_sci_enable_interrupts(tms570_sci_context * ctx) |
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157 | { |
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158 | ctx->regs->SETINT = TMS570_SCI_SETINT_SET_RX_INT; |
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159 | } |
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160 | |
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161 | /** |
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162 | * @brief Disables RX interrupt |
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163 | * |
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164 | * Disables RX interrupt source of SCI peripheral specified in the driver |
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165 | * context. |
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166 | * |
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167 | * @param[in] ctx context of the driver |
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168 | * @retval Void |
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169 | */ |
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170 | static void tms570_sci_disable_interrupts(tms570_sci_context * ctx) |
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171 | { |
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172 | ctx->regs->CLEARINT = TMS570_SCI_CLEARINT_CLR_RX_INT; |
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173 | } |
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174 | |
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175 | /** |
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176 | * @brief Check whether driver has put char in HW |
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177 | * |
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178 | * Check whether driver has put char in HW. |
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179 | * This information is read from the driver context not from a peripheral. |
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180 | * TMS570 does not have write data buffer asociated with SCI |
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181 | * so the return can be only 0 or 1. |
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182 | * |
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183 | * @param[in] ctx context of the driver |
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184 | * @retval x |
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185 | */ |
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186 | static int tms570_sci_transmitted_chars(tms570_sci_context * ctx) |
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187 | { |
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188 | int ret; |
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189 | |
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190 | ret = ctx->tx_chars_in_hw; |
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191 | if ( ret == 1 ) { |
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192 | ctx->tx_chars_in_hw = 0; |
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193 | return 1; |
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194 | } |
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195 | return ret; |
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196 | } |
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197 | |
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198 | /** |
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199 | * @brief Set attributes of the HW peripheral |
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200 | * |
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201 | * Sets attributes of the HW peripheral (parity, baud rate, etc.) |
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202 | * |
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203 | * @param[in] base context of the driver |
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204 | * @param[in] t termios driver |
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205 | * @retval true peripheral setting is changed |
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206 | */ |
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207 | static bool tms570_sci_set_attributes( |
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208 | rtems_termios_device_context *base, |
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209 | const struct termios *t |
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210 | ) |
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211 | { |
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212 | tms570_sci_context *ctx = (tms570_sci_context *) base; |
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213 | rtems_interrupt_lock_context lock_context; |
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214 | int32_t bauddiv; |
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215 | int32_t baudrate; |
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216 | |
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217 | rtems_termios_device_lock_acquire(base, &lock_context); |
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218 | |
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219 | ctx->regs->GCR1 &= ~( TMS570_SCI_GCR1_SWnRST | TMS570_SCI_GCR1_TXENA | |
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220 | TMS570_SCI_GCR1_RXENA ); |
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221 | |
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222 | ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_STOP; /*one stop bit*/ |
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223 | ctx->regs->FORMAT = TMS570_SCI_FORMAT_CHAR(0x7); |
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224 | |
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225 | switch ( t->c_cflag & ( PARENB|PARODD ) ) { |
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226 | case ( PARENB|PARODD ): |
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227 | /* Odd parity */ |
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228 | ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_PARITY; |
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229 | ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY_ENA; |
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230 | break; |
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231 | |
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232 | case PARENB: |
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233 | /* Even parity */ |
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234 | ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY; |
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235 | ctx->regs->GCR1 |= TMS570_SCI_GCR1_PARITY_ENA; |
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236 | break; |
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237 | |
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238 | default: |
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239 | case 0: |
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240 | case PARODD: |
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241 | /* No Parity */ |
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242 | ctx->regs->GCR1 &= ~TMS570_SCI_GCR1_PARITY_ENA; |
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243 | } |
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244 | |
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245 | /* Baud rate */ |
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246 | baudrate = rtems_termios_baud_to_number(cfgetospeed(t)); |
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247 | baudrate *= 2 * 16; |
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248 | bauddiv = (BSP_PLL_OUT_CLOCK + baudrate / 2) / baudrate; |
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249 | ctx->regs->BRS = bauddiv; |
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250 | |
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251 | ctx->regs->GCR1 |= TMS570_SCI_GCR1_SWnRST | TMS570_SCI_GCR1_TXENA | |
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252 | TMS570_SCI_GCR1_RXENA; |
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253 | |
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254 | rtems_termios_device_lock_release(base, &lock_context); |
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255 | |
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256 | return true; |
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257 | } |
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258 | |
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259 | /** |
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260 | * @brief sci interrupt handler |
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261 | * |
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262 | * Handler checks which interrupt occured and provides nessesary maintenance |
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263 | * dequeue characters in termios driver whether character is send succesfully |
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264 | * enqueue characters in termios driver whether character is recieved |
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265 | * |
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266 | * @param[in] arg rtems_termios_tty |
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267 | * @retval Void |
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268 | */ |
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269 | static void tms570_sci_interrupt_handler(void * arg) |
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270 | { |
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271 | rtems_termios_tty *tty = arg; |
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272 | tms570_sci_context *ctx = rtems_termios_get_device_context(tty); |
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273 | char buf[TMS570_SCI_BUFFER_SIZE]; |
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274 | size_t n; |
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275 | |
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276 | /* |
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277 | * Check if we have received something. |
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278 | */ |
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279 | if ( (ctx->regs->FLR & TMS570_SCI_FLR_RXRDY ) == TMS570_SCI_FLR_RXRDY ) { |
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280 | n = tms570_sci_read_received_chars(ctx, buf, TMS570_SCI_BUFFER_SIZE); |
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281 | if ( n > 0 ) { |
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282 | /* Hand the data over to the Termios infrastructure */ |
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283 | rtems_termios_enqueue_raw_characters(tty, buf, n); |
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284 | } |
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285 | } |
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286 | /* |
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287 | * Check if we have something transmitted. |
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288 | */ |
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289 | if ( (ctx->regs->FLR & TMS570_SCI_FLR_TXRDY ) == TMS570_SCI_FLR_TXRDY ) { |
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290 | n = tms570_sci_transmitted_chars(ctx); |
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291 | if ( n > 0 ) { |
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292 | /* |
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293 | * Notify Termios that we have transmitted some characters. It |
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294 | * will call now the interrupt write function if more characters |
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295 | * are ready for transmission. |
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296 | */ |
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297 | rtems_termios_dequeue_characters(tty, n); |
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298 | } |
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299 | } |
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300 | } |
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301 | |
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302 | /** |
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303 | * @brief sci write function called from interrupt |
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304 | * |
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305 | * Nonblocking write function. Writes characters to HW peripheral |
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306 | * TMS570 does not have write data buffer asociated with SCI |
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307 | * so only one character can be written. |
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308 | * |
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309 | * @param[in] base context of the driver |
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310 | * @param[in] buf buffer of characters pending to send |
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311 | * @param[in] len size of the buffer |
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312 | * @retval Void |
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313 | */ |
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314 | static void tms570_sci_interrupt_write( |
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315 | rtems_termios_device_context *base, |
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316 | const char *buf, |
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317 | size_t len |
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318 | ) |
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319 | { |
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320 | tms570_sci_context *ctx = (tms570_sci_context *) base; |
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321 | |
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322 | if ( len > 0 ) { |
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323 | /* start UART TX, this will result in an interrupt when done */ |
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324 | ctx->regs->TD = *buf; |
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325 | /* character written - raise count*/ |
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326 | ctx->tx_chars_in_hw = 1; |
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327 | /* Enable TX interrupt (interrupt is edge-triggered) */ |
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328 | ctx->regs->SETINT = (1<<8); |
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329 | |
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330 | } else { |
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331 | /* No more to send, disable TX interrupts */ |
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332 | ctx->regs->CLEARINT = (1<<8); |
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333 | /* Tell close that we sent everything */ |
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334 | } |
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335 | } |
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336 | |
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337 | /** |
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338 | * @brief sci write function |
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339 | * |
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340 | * Blocking write function. Waits until HW peripheral is ready and then writes |
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341 | * character to HW peripheral. Writes all characters in the buffer. |
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342 | * |
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343 | * @param[in] base context of the driver |
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344 | * @param[in] buf buffer of characters pending to send |
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345 | * @param[in] len size of the buffer |
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346 | * @retval Void |
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347 | */ |
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348 | static void tms570_sci_poll_write( |
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349 | rtems_termios_device_context *base, |
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350 | const char *buf, |
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351 | size_t n |
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352 | ) |
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353 | { |
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354 | tms570_sci_context *ctx = (tms570_sci_context *) base; |
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355 | size_t i; |
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356 | |
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357 | /* Write */ |
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358 | |
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359 | for ( i = 0; i < n; ++i ) { |
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360 | while ( (ctx->regs->FLR & TMS570_SCI_FLR_TX_EMPTY ) == 0) { |
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361 | ; |
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362 | } |
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363 | ctx->regs->TD = buf[i]; |
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364 | } |
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365 | } |
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366 | |
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367 | /** |
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368 | * @brief See if there is recieved charakter to read |
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369 | * |
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370 | * read the RX flag from peripheral specified in context |
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371 | * |
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372 | * @param[in] ctx context of the driver |
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373 | * @retval 0 No character to read |
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374 | * @retval x Character ready to read |
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375 | */ |
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376 | static int TMS570_sci_can_read_char( |
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377 | tms570_sci_context * ctx |
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378 | ) |
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379 | { |
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380 | return ctx->regs->FLR & TMS570_SCI_FLR_RXRDY; |
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381 | } |
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382 | |
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383 | /** |
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384 | * @brief reads character from peripheral |
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385 | * |
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386 | * reads the recieved character from peripheral specified in context |
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387 | * |
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388 | * @param[in] ctx context of the driver |
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389 | * @retval x Character |
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390 | */ |
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391 | static char TMS570_sci_read_char( |
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392 | tms570_sci_context * ctx |
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393 | ) |
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394 | { |
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395 | return ctx->regs->RD; |
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396 | } |
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397 | |
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398 | /** |
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399 | * @brief sci read function |
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400 | * |
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401 | * check if there is recieved character to be read and reads it. |
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402 | * |
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403 | * @param[in] base context of the driver |
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404 | * @retval -1 No character to be read |
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405 | * @retval x Read character |
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406 | */ |
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407 | static int tms570_sci_poll_read(rtems_termios_device_context *base) |
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408 | { |
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409 | tms570_sci_context *ctx = (tms570_sci_context *) base; |
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410 | |
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411 | /* Check if a character is available */ |
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412 | if ( TMS570_sci_can_read_char(ctx) ) { |
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413 | return TMS570_sci_read_char(ctx); |
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414 | } else { |
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415 | return -1; |
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416 | } |
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417 | } |
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418 | |
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419 | /** |
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420 | * @brief initialization of the driver |
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421 | * |
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422 | * initialization of the HW peripheral specified in contex of the driver. |
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423 | * This function is called only once when opening the driver. |
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424 | * |
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425 | * @param[in] tty Termios control |
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426 | * @param[in] ctx context of the driver |
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427 | * @param[in] term Termios attributes |
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428 | * @param[in] args |
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429 | * @retval false Error occured during initialization |
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430 | * @retval true Driver is open and ready |
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431 | */ |
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432 | static bool tms570_sci_poll_first_open( |
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433 | rtems_termios_tty *tty, |
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434 | rtems_termios_device_context *ctx, |
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435 | struct termios *term, |
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436 | rtems_libio_open_close_args_t *args |
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437 | ) |
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438 | { |
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439 | bool ok; |
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440 | |
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441 | rtems_termios_set_best_baud(term, TMS570_SCI_BAUD_RATE); |
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442 | ok = tms570_sci_set_attributes(ctx, term); |
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443 | if ( !ok ) { |
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444 | return false; |
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445 | } |
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446 | return true; |
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447 | } |
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448 | |
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449 | /** |
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450 | * @brief initialization of the interrupt driven driver |
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451 | * |
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452 | * calls tms570_sci_poll_first_open function. |
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453 | * install and enables interrupts. |
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454 | * |
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455 | * @param[in] tty Termios control |
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456 | * @param[in] base context of the driver |
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457 | * @param[in] args |
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458 | * @retval false Error occured during initialization |
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459 | * @retval true Driver is open and ready |
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460 | */ |
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461 | static bool tms570_sci_interrupt_first_open( |
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462 | rtems_termios_tty *tty, |
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463 | rtems_termios_device_context *base, |
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464 | struct termios *term, |
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465 | rtems_libio_open_close_args_t *args |
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466 | ) |
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467 | { |
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468 | tms570_sci_context *ctx = (tms570_sci_context *) base; |
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469 | rtems_status_code sc; |
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470 | bool ret; |
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471 | |
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472 | ret = tms570_sci_poll_first_open(tty, base, term, args); |
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473 | if ( ret == false ) { |
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474 | return false; |
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475 | } |
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476 | ctx->regs->SETINTLVL = 0; |
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477 | /* Register Interrupt handler */ |
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478 | sc = rtems_interrupt_handler_install(ctx->irq, |
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479 | ctx->device_name, |
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480 | RTEMS_INTERRUPT_SHARED, |
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481 | tms570_sci_interrupt_handler, |
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482 | tty |
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483 | ); |
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484 | if ( sc != RTEMS_SUCCESSFUL ) { |
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485 | return false; |
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486 | } |
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487 | tms570_sci_enable_interrupts(ctx); |
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488 | return true; |
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489 | } |
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490 | |
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491 | /** |
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492 | * @brief closes sci peripheral |
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493 | * |
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494 | * @param[in] tty Termios control |
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495 | * @param[in] base context of the driver |
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496 | * @param[in] args |
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497 | * @retval false Error occured during initialization |
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498 | * @retval true Driver is open and ready |
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499 | */ |
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500 | static void tms570_sci_poll_last_close( |
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501 | rtems_termios_tty *tty, |
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502 | rtems_termios_device_context *base, |
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503 | rtems_libio_open_close_args_t *args |
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504 | ) |
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505 | { |
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506 | ; |
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507 | } |
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508 | |
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509 | /** |
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510 | * @brief closes sci peripheral of interrupt driven driver |
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511 | * |
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512 | * calls tms570_sci_poll_last_close and disables interrupts |
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513 | * |
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514 | * @param[in] tty Termios control |
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515 | * @param[in] base context of the driver |
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516 | * @param[in] args |
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517 | * @retval false Error occured during initialization |
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518 | * @retval true Driver is open and ready |
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519 | */ |
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520 | static void tms570_sci_interrupt_last_close( |
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521 | rtems_termios_tty *tty, |
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522 | rtems_termios_device_context *base, |
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523 | rtems_libio_open_close_args_t *args |
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524 | ) |
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525 | { |
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526 | tms570_sci_context *ctx = (tms570_sci_context *) base; |
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527 | rtems_interrupt_lock_context lock_context; |
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528 | |
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529 | /* Turn off RX interrupts */ |
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530 | rtems_termios_device_lock_acquire(base, &lock_context); |
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531 | tms570_sci_disable_interrupts(ctx); |
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532 | rtems_termios_device_lock_release(base, &lock_context); |
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533 | |
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534 | /* Flush device */ |
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535 | while ( ( ctx->regs->FLR & TMS570_SCI_FLR_TX_EMPTY ) > 0 ) { |
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536 | ;/* Wait until all data has been sent */ |
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537 | } |
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538 | |
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539 | /* uninstall ISR */ |
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540 | rtems_interrupt_handler_remove(ctx->irq, tms570_sci_interrupt_handler, tty); |
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541 | |
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542 | tms570_sci_poll_last_close(tty, base, args); |
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543 | } |
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544 | |
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545 | /** |
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546 | * @brief Struct containing definitions of polled driver functions. |
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547 | * |
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548 | * Encapsulates polled driver functions. |
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549 | * Use of this table is determited by not defining TMS570_USE_INTERRUPTS |
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550 | */ |
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551 | const rtems_termios_device_handler tms570_sci_handler_polled = { |
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552 | .first_open = tms570_sci_poll_first_open, |
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553 | .last_close = tms570_sci_poll_last_close, |
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554 | .poll_read = tms570_sci_poll_read, |
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555 | .write = tms570_sci_poll_write, |
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556 | .set_attributes = tms570_sci_set_attributes, |
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557 | .mode = TERMIOS_POLLED |
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558 | }; |
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559 | |
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560 | /** |
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561 | * @brief Struct containing definitions of interrupt driven driver functions. |
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562 | * |
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563 | * Encapsulates interrupt driven driver functions. |
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564 | * Use of this table is determited by defining TMS570_USE_INTERRUPTS |
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565 | */ |
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566 | const rtems_termios_device_handler tms570_sci_handler_interrupt = { |
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567 | .first_open = tms570_sci_interrupt_first_open, |
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568 | .last_close = tms570_sci_interrupt_last_close, |
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569 | .poll_read = NULL, |
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570 | .write = tms570_sci_interrupt_write, |
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571 | .set_attributes = tms570_sci_set_attributes, |
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572 | .mode = TERMIOS_IRQ_DRIVEN |
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573 | }; |
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