1 | /* |
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2 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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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 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <bsp.h> |
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16 | #include <bsp/irq.h> |
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17 | #include <bsp/fatal.h> |
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18 | #include <rtems/console.h> |
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19 | |
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20 | #include <rtems/termiostypes.h> |
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21 | |
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22 | #include <chip.h> |
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23 | |
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24 | #include <unistd.h> |
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25 | |
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26 | typedef struct { |
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27 | rtems_termios_device_context base; |
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28 | Uart *regs; |
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29 | rtems_vector_number irq; |
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30 | uint32_t id; |
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31 | bool console; |
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32 | bool is_usart; |
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33 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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34 | bool transmitting; |
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35 | #endif |
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36 | } atsam_uart_context; |
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37 | |
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38 | static atsam_uart_context atsam_usart_instances[] = { |
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39 | { |
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40 | .regs = (Uart *)USART0, |
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41 | .irq = USART0_IRQn, |
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42 | .id = ID_USART0, |
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43 | .is_usart = true, |
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44 | } |
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45 | #ifdef USART1 |
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46 | , { |
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47 | .regs = (Uart *)USART1, |
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48 | .irq = USART1_IRQn, |
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49 | .id = ID_USART1, |
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50 | .is_usart = true, |
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51 | } |
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52 | #endif |
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53 | #ifdef USART2 |
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54 | , { |
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55 | .regs = (Uart *)USART2, |
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56 | .irq = USART2_IRQn, |
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57 | .id = ID_USART2, |
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58 | .is_usart = true, |
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59 | } |
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60 | #endif |
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61 | }; |
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62 | |
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63 | static atsam_uart_context atsam_uart_instances[] = { |
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64 | { |
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65 | .regs = UART0, |
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66 | .irq = UART0_IRQn, |
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67 | .id = ID_UART0, |
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68 | .is_usart = false, |
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69 | } |
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70 | #ifdef UART1 |
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71 | , { |
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72 | .regs = UART1, |
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73 | .irq = UART1_IRQn, |
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74 | .id = ID_UART1, |
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75 | .is_usart = false, |
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76 | } |
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77 | #endif |
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78 | #ifdef UART2 |
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79 | , { |
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80 | .regs = UART2, |
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81 | .irq = UART2_IRQn, |
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82 | .id = ID_UART2, |
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83 | .is_usart = false, |
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84 | } |
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85 | #endif |
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86 | #ifdef UART3 |
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87 | , { |
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88 | .regs = UART3, |
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89 | .irq = UART3_IRQn, |
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90 | .id = ID_UART3, |
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91 | .is_usart = false, |
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92 | } |
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93 | #endif |
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94 | #ifdef UART4 |
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95 | , { |
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96 | .regs = UART4, |
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97 | .irq = UART4_IRQn, |
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98 | .id = ID_UART4, |
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99 | .is_usart = false, |
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100 | } |
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101 | #endif |
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102 | }; |
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103 | |
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104 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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105 | static void atsam_uart_interrupt(void *arg) |
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106 | { |
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107 | rtems_termios_tty *tty = arg; |
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108 | atsam_uart_context *ctx = rtems_termios_get_device_context(tty); |
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109 | Uart *regs = ctx->regs; |
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110 | uint32_t sr = regs->UART_SR; |
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111 | |
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112 | while ((sr & UART_SR_RXRDY) != 0) { |
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113 | char c = (char) regs->UART_RHR; |
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114 | |
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115 | rtems_termios_enqueue_raw_characters(tty, &c, 1); |
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116 | |
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117 | sr = regs->UART_SR; |
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118 | } |
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119 | |
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120 | if (ctx->transmitting && (sr & UART_SR_TXEMPTY) != 0) { |
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121 | rtems_termios_dequeue_characters(tty, 1); |
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122 | } |
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123 | } |
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124 | #endif |
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125 | |
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126 | static bool atsam_uart_set_attributes( |
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127 | rtems_termios_device_context *base, |
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128 | const struct termios *term |
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129 | ) |
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130 | { |
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131 | atsam_uart_context *ctx = (atsam_uart_context *) base; |
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132 | Uart *regs = ctx->regs; |
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133 | rtems_termios_baud_t baud; |
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134 | uint32_t mr; |
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135 | |
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136 | baud = rtems_termios_baud_to_number(term->c_ospeed); |
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137 | regs->UART_BRGR = (BOARD_MCK / baud) / 16; |
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138 | |
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139 | if ((term->c_cflag & CREAD) != 0) { |
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140 | regs->UART_CR = UART_CR_RXEN | UART_CR_TXEN; |
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141 | } else { |
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142 | regs->UART_CR = UART_CR_TXEN; |
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143 | } |
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144 | |
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145 | if (ctx->is_usart) { |
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146 | mr = US_MR_USART_MODE_NORMAL | US_MR_USCLKS_MCK; |
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147 | } else { |
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148 | mr = UART_MR_FILTER_DISABLED | UART_MR_BRSRCCK_PERIPH_CLK; |
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149 | } |
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150 | |
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151 | if (ctx->is_usart) { |
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152 | switch (term->c_cflag & CSIZE) { |
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153 | case CS5: |
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154 | mr |= US_MR_CHRL_5_BIT; |
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155 | break; |
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156 | case CS6: |
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157 | mr |= US_MR_CHRL_6_BIT; |
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158 | break; |
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159 | case CS7: |
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160 | mr |= US_MR_CHRL_7_BIT; |
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161 | break; |
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162 | default: |
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163 | mr |= US_MR_CHRL_8_BIT; |
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164 | break; |
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165 | } |
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166 | } else { |
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167 | if ((term->c_cflag & CSIZE) != CS8) { |
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168 | return false; |
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169 | } |
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170 | } |
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171 | |
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172 | if ((term->c_cflag & PARENB) != 0) { |
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173 | if ((term->c_cflag & PARODD) != 0) { |
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174 | mr |= UART_MR_PAR_ODD; |
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175 | } else { |
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176 | mr |= UART_MR_PAR_EVEN; |
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177 | } |
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178 | } else { |
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179 | mr |= UART_MR_PAR_NO; |
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180 | } |
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181 | |
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182 | if (ctx->is_usart) { |
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183 | if ((term->c_cflag & CSTOPB) != 0) { |
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184 | mr |= US_MR_NBSTOP_2_BIT; |
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185 | } else { |
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186 | mr |= US_MR_NBSTOP_1_BIT; |
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187 | } |
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188 | } else { |
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189 | if ((term->c_cflag & CSTOPB) != 0) { |
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190 | return false; |
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191 | } |
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192 | } |
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193 | |
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194 | regs->UART_MR = mr; |
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195 | |
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196 | return true; |
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197 | } |
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198 | |
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199 | static bool atsam_uart_first_open( |
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200 | rtems_termios_tty *tty, |
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201 | rtems_termios_device_context *base, |
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202 | struct termios *term, |
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203 | rtems_libio_open_close_args_t *args |
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204 | ) |
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205 | { |
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206 | atsam_uart_context *ctx = (atsam_uart_context *) base; |
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207 | Uart *regs = ctx->regs; |
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208 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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209 | rtems_status_code sc; |
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210 | #endif |
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211 | |
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212 | regs->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RSTSTA; |
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213 | regs->UART_IDR = 0xffffffff; |
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214 | |
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215 | PMC_EnablePeripheral(ctx->id); |
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216 | |
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217 | rtems_termios_set_initial_baud(tty, ATSAM_CONSOLE_BAUD); |
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218 | atsam_uart_set_attributes(base, term); |
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219 | |
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220 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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221 | regs->UART_IER = UART_IDR_RXRDY; |
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222 | sc = rtems_interrupt_handler_install( |
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223 | ctx->irq, |
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224 | ctx->is_usart ? "USART" : "UART", |
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225 | RTEMS_INTERRUPT_SHARED, |
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226 | atsam_uart_interrupt, |
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227 | tty |
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228 | ); |
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229 | if (sc != RTEMS_SUCCESSFUL) { |
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230 | return false; |
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231 | } |
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232 | #endif |
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233 | |
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234 | return true; |
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235 | } |
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236 | |
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237 | static void atsam_uart_last_close( |
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238 | rtems_termios_tty *tty, |
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239 | rtems_termios_device_context *base, |
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240 | rtems_libio_open_close_args_t *args |
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241 | ) |
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242 | { |
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243 | atsam_uart_context *ctx = (atsam_uart_context *) base; |
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244 | |
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245 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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246 | rtems_interrupt_handler_remove(ctx->irq, atsam_uart_interrupt, tty); |
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247 | #endif |
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248 | |
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249 | if (!ctx->console) { |
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250 | PMC_DisablePeripheral(ctx->id); |
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251 | } |
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252 | } |
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253 | |
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254 | static void atsam_uart_write( |
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255 | rtems_termios_device_context *base, |
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256 | const char *buf, |
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257 | size_t len |
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258 | ) |
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259 | { |
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260 | atsam_uart_context *ctx = (atsam_uart_context *) base; |
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261 | Uart *regs = ctx->regs; |
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262 | |
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263 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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264 | if (len > 0) { |
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265 | ctx->transmitting = true; |
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266 | regs->UART_THR = buf[0]; |
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267 | regs->UART_IER = UART_IDR_TXEMPTY; |
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268 | } else { |
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269 | ctx->transmitting = false; |
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270 | regs->UART_IDR = UART_IDR_TXEMPTY; |
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271 | } |
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272 | #else |
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273 | size_t i; |
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274 | |
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275 | for (i = 0; i < len; ++i) { |
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276 | while ((regs->UART_SR & UART_SR_TXEMPTY) == 0) { |
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277 | /* Wait */ |
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278 | } |
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279 | |
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280 | regs->UART_THR = buf[i]; |
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281 | } |
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282 | #endif |
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283 | } |
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284 | |
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285 | #ifndef ATSAM_CONSOLE_USE_INTERRUPTS |
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286 | static int atsam_uart_read(rtems_termios_device_context *base) |
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287 | { |
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288 | atsam_uart_context *ctx = (atsam_uart_context *) base; |
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289 | Uart *regs = ctx->regs; |
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290 | |
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291 | if ((regs->UART_SR & UART_SR_RXRDY) != 0) { |
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292 | return (char) regs->UART_RHR; |
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293 | } else { |
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294 | return -1; |
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295 | } |
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296 | } |
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297 | #endif |
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298 | |
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299 | static const rtems_termios_device_handler atsam_uart_handler = { |
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300 | .first_open = atsam_uart_first_open, |
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301 | .last_close = atsam_uart_last_close, |
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302 | .write = atsam_uart_write, |
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303 | .set_attributes = atsam_uart_set_attributes, |
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304 | #ifdef ATSAM_CONSOLE_USE_INTERRUPTS |
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305 | .mode = TERMIOS_IRQ_DRIVEN |
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306 | #else |
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307 | .poll_read = atsam_uart_read, |
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308 | .mode = TERMIOS_POLLED |
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309 | #endif |
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310 | }; |
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311 | |
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312 | rtems_status_code console_initialize( |
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313 | rtems_device_major_number major, |
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314 | rtems_device_minor_number minor, |
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315 | void *arg |
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316 | ) |
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317 | { |
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318 | size_t i; |
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319 | |
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320 | rtems_termios_initialize(); |
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321 | |
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322 | for (i = 0; i < RTEMS_ARRAY_SIZE(atsam_usart_instances); ++i) { |
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323 | char usart[] = "/dev/ttyUSARTX"; |
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324 | |
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325 | usart[sizeof(usart) - 2] = (char) ('0' + i); |
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326 | rtems_termios_device_install( |
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327 | &usart[0], |
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328 | &atsam_uart_handler, |
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329 | NULL, |
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330 | &atsam_usart_instances[i].base |
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331 | ); |
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332 | |
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333 | #if ATSAM_CONSOLE_DEVICE_TYPE == 0 |
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334 | if (i == ATSAM_CONSOLE_DEVICE_INDEX) { |
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335 | atsam_usart_instances[i].console = true; |
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336 | link(&usart[0], CONSOLE_DEVICE_NAME); |
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337 | } |
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338 | #endif |
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339 | } |
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340 | |
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341 | for (i = 0; i < RTEMS_ARRAY_SIZE(atsam_uart_instances); ++i) { |
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342 | char uart[] = "/dev/ttyUARTX"; |
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343 | |
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344 | uart[sizeof(uart) - 2] = (char) ('0' + i); |
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345 | rtems_termios_device_install( |
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346 | &uart[0], |
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347 | &atsam_uart_handler, |
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348 | NULL, |
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349 | &atsam_uart_instances[i].base |
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350 | ); |
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351 | |
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352 | #if ATSAM_CONSOLE_DEVICE_TYPE == 1 |
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353 | if (i == ATSAM_CONSOLE_DEVICE_INDEX) { |
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354 | atsam_uart_instances[i].console = true; |
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355 | link(&uart[0], CONSOLE_DEVICE_NAME); |
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356 | } |
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357 | #endif |
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358 | } |
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359 | |
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360 | return RTEMS_SUCCESSFUL; |
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361 | } |
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