1 | /* |
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2 | * This file contains the TTY driver for the serial ports on the LEON. |
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3 | * |
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4 | * This driver uses the termios pseudo driver. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1998. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * Modified for LEON3 BSP. |
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10 | * COPYRIGHT (c) 2004. |
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11 | * Gaisler Research. |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.com/license/LICENSE. |
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16 | */ |
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17 | |
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18 | /* Define CONSOLE_USE_INTERRUPTS to enable APBUART interrupt handling instead |
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19 | * of polling mode. |
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20 | * |
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21 | * Note that it is not possible to use the interrupt mode of the driver |
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22 | * together with the "old" APBUART and -u to GRMON. However the new |
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23 | * APBUART core (from GRLIB 1.0.17-b2710) has the GRMON debug bit and can |
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24 | * handle interrupts. |
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25 | * |
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26 | * NOTE: This can be defined in the make/custom/leon3.cfg file. |
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27 | */ |
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28 | |
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29 | #include <bsp.h> |
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30 | #include <rtems/libio.h> |
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31 | #include <stdlib.h> |
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32 | #include <assert.h> |
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33 | #include <rtems/bspIo.h> |
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34 | #include <leon.h> |
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35 | #include <rtems/termiostypes.h> |
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36 | |
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37 | int syscon_uart_index __attribute__((weak)) = 0; |
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38 | |
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39 | /* body is in debugputs.c */ |
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40 | |
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41 | struct apbuart_priv { |
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42 | struct apbuart_regs *regs; |
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43 | unsigned int freq_hz; |
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44 | #if CONSOLE_USE_INTERRUPTS |
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45 | int irq; |
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46 | void *cookie; |
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47 | volatile int sending; |
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48 | char *buf; |
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49 | #endif |
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50 | }; |
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51 | static struct apbuart_priv apbuarts[BSP_NUMBER_OF_TERMIOS_PORTS]; |
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52 | static int uarts = 0; |
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53 | |
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54 | static struct apbuart_priv *leon3_console_get_uart(int minor) |
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55 | { |
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56 | struct apbuart_priv *uart; |
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57 | |
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58 | if (minor == 0) |
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59 | uart = &apbuarts[syscon_uart_index]; |
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60 | else |
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61 | uart = &apbuarts[minor - 1]; |
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62 | |
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63 | return uart; |
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64 | } |
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65 | |
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66 | #if CONSOLE_USE_INTERRUPTS |
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67 | |
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68 | /* Handle UART interrupts */ |
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69 | static void leon3_console_isr(void *arg) |
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70 | { |
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71 | struct apbuart_priv *uart = arg; |
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72 | unsigned int status; |
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73 | char data; |
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74 | |
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75 | /* Get all received characters */ |
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76 | while ((status=uart->regs->status) & LEON_REG_UART_STATUS_DR) { |
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77 | /* Data has arrived, get new data */ |
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78 | data = uart->regs->data; |
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79 | |
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80 | /* Tell termios layer about new character */ |
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81 | rtems_termios_enqueue_raw_characters(uart->cookie, &data, 1); |
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82 | } |
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83 | |
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84 | if ( |
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85 | (status & LEON_REG_UART_STATUS_THE) |
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86 | && (uart->regs->ctrl & LEON_REG_UART_CTRL_TI) != 0 |
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87 | ) { |
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88 | /* write_interrupt will get called from this function */ |
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89 | rtems_termios_dequeue_characters(uart->cookie, 1); |
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90 | } |
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91 | } |
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92 | |
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93 | /* |
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94 | * Console Termios Write-Buffer Support Entry Point |
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95 | * |
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96 | */ |
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97 | static int leon3_console_write_support(int minor, const char *buf, size_t len) |
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98 | { |
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99 | struct apbuart_priv *uart = leon3_console_get_uart(minor); |
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100 | int sending; |
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101 | |
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102 | if (len > 0) { |
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103 | /* Enable TX interrupt (interrupt is edge-triggered) */ |
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104 | uart->regs->ctrl |= LEON_REG_UART_CTRL_TI; |
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105 | |
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106 | /* start UART TX, this will result in an interrupt when done */ |
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107 | uart->regs->data = *buf; |
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108 | |
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109 | sending = 1; |
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110 | } else { |
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111 | /* No more to send, disable TX interrupts */ |
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112 | uart->regs->ctrl &= ~LEON_REG_UART_CTRL_TI; |
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113 | |
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114 | /* Tell close that we sent everything */ |
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115 | sending = 0; |
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116 | } |
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117 | |
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118 | uart->sending = sending; |
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119 | |
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120 | return 0; |
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121 | } |
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122 | |
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123 | #else |
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124 | |
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125 | /* |
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126 | * Console Termios Support Entry Points |
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127 | */ |
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128 | static ssize_t leon3_console_write_polled( |
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129 | int minor, |
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130 | const char *buf, |
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131 | size_t len |
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132 | ) |
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133 | { |
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134 | struct apbuart_priv *uart = leon3_console_get_uart(minor); |
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135 | int nwrite = 0; |
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136 | |
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137 | while (nwrite < len) { |
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138 | apbuart_outbyte_polled(uart->regs, *buf++, 1, 0); |
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139 | nwrite++; |
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140 | } |
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141 | return nwrite; |
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142 | } |
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143 | |
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144 | static int leon3_console_pollRead(int minor) |
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145 | { |
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146 | struct apbuart_priv *uart = leon3_console_get_uart(minor); |
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147 | |
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148 | return apbuart_inbyte_nonblocking(uart->regs); |
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149 | } |
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150 | |
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151 | #endif |
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152 | |
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153 | static int leon3_console_set_attributes(int minor, const struct termios *t) |
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154 | { |
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155 | struct apbuart_priv *uart = leon3_console_get_uart(minor); |
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156 | unsigned int scaler; |
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157 | unsigned int ctrl; |
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158 | int baud; |
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159 | |
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160 | switch (t->c_cflag & CSIZE) { |
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161 | default: |
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162 | case CS5: |
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163 | case CS6: |
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164 | case CS7: |
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165 | /* Hardware doesn't support other than CS8 */ |
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166 | return -1; |
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167 | case CS8: |
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168 | break; |
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169 | } |
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170 | |
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171 | /* |
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172 | * FIXME: This read-modify-write sequence is broken since interrupts may |
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173 | * interfere. |
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174 | */ |
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175 | |
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176 | /* Read out current value */ |
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177 | ctrl = uart->regs->ctrl; |
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178 | |
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179 | switch (t->c_cflag & (PARENB|PARODD)) { |
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180 | case (PARENB|PARODD): |
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181 | /* Odd parity */ |
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182 | ctrl |= LEON_REG_UART_CTRL_PE|LEON_REG_UART_CTRL_PS; |
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183 | break; |
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184 | |
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185 | case PARENB: |
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186 | /* Even parity */ |
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187 | ctrl &= ~LEON_REG_UART_CTRL_PS; |
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188 | ctrl |= LEON_REG_UART_CTRL_PE; |
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189 | break; |
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190 | |
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191 | default: |
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192 | case 0: |
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193 | case PARODD: |
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194 | /* No Parity */ |
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195 | ctrl &= ~(LEON_REG_UART_CTRL_PS|LEON_REG_UART_CTRL_PE); |
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196 | } |
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197 | |
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198 | if (!(t->c_cflag & CLOCAL)) { |
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199 | ctrl |= LEON_REG_UART_CTRL_FL; |
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200 | } else { |
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201 | ctrl &= ~LEON_REG_UART_CTRL_FL; |
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202 | } |
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203 | |
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204 | /* Update new settings */ |
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205 | uart->regs->ctrl = ctrl; |
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206 | |
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207 | /* Baud rate */ |
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208 | baud = rtems_termios_baud_to_number(t->c_cflag); |
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209 | if (baud > 0) { |
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210 | /* Calculate Baud rate generator "scaler" number */ |
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211 | scaler = (((uart->freq_hz * 10) / (baud * 8)) - 5) / 10; |
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212 | |
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213 | /* Set new baud rate by setting scaler */ |
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214 | uart->regs->scaler = scaler; |
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215 | } |
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216 | |
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217 | return 0; |
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218 | } |
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219 | |
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220 | #ifndef LEON3_QEMU |
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221 | /* AMBA PP find routine. Extract AMBA PnP information into data structure. */ |
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222 | static int find_matching_apbuart(struct ambapp_dev *dev, int index, void *arg) |
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223 | { |
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224 | struct ambapp_apb_info *apb = (struct ambapp_apb_info *)dev->devinfo; |
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225 | |
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226 | /* Extract needed information of one APBUART */ |
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227 | apbuarts[uarts].regs = (struct apbuart_regs *)apb->start; |
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228 | #if CONSOLE_USE_INTERRUPTS |
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229 | apbuarts[uarts].irq = apb->irq; |
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230 | #endif |
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231 | /* Get APBUART core frequency, it is assumed that it is the same |
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232 | * as Bus frequency where the UART is situated |
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233 | */ |
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234 | apbuarts[uarts].freq_hz = ambapp_freq_get(&ambapp_plb, dev); |
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235 | uarts++; |
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236 | |
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237 | if (uarts >= BSP_NUMBER_OF_TERMIOS_PORTS) |
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238 | return 1; /* Satisfied number of UARTs, stop search */ |
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239 | else |
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240 | return 0; /* Continue searching for more UARTs */ |
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241 | } |
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242 | |
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243 | /* Find all UARTs */ |
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244 | static void leon3_console_scan_uarts(void) |
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245 | { |
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246 | memset(apbuarts, 0, sizeof(apbuarts)); |
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247 | |
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248 | /* Find APBUART cores */ |
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249 | ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS), VENDOR_GAISLER, |
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250 | GAISLER_APBUART, find_matching_apbuart, NULL); |
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251 | } |
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252 | #else /* LEON3_QEMU */ |
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253 | static void leon3_console_scan_uarts(void) |
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254 | { |
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255 | uarts = 1; |
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256 | |
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257 | apbuarts[0].regs = (struct apbuart_regs *)0x80000100; |
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258 | #if CONSOLE_USE_INTERRUPTS |
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259 | apbuarts[0].irq = 3; |
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260 | #endif |
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261 | apbuarts[0].freq_hz = 40000000; |
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262 | } |
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263 | #endif /* LEON3_QEMU */ |
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264 | |
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265 | /* |
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266 | * Console Device Driver Entry Points |
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267 | * |
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268 | */ |
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269 | |
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270 | rtems_device_driver console_initialize( |
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271 | rtems_device_major_number major, |
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272 | rtems_device_minor_number minor, |
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273 | void *arg |
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274 | ) |
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275 | { |
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276 | rtems_status_code status; |
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277 | int i; |
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278 | char console_name[16]; |
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279 | |
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280 | rtems_termios_initialize(); |
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281 | |
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282 | /* Find UARTs */ |
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283 | leon3_console_scan_uarts(); |
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284 | |
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285 | /* Update syscon_uart_index to index used as /dev/console |
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286 | * Let user select System console by setting syscon_uart_index. If the |
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287 | * BSP is to provide the default UART (syscon_uart_index==0): |
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288 | * non-MP: APBUART[0] is system console |
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289 | * MP: LEON CPU index select UART |
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290 | */ |
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291 | if (syscon_uart_index == 0) { |
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292 | #if defined(RTEMS_MULTIPROCESSING) |
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293 | syscon_uart_index = LEON3_Cpu_Index; |
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294 | #else |
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295 | syscon_uart_index = 0; |
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296 | #endif |
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297 | } else { |
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298 | syscon_uart_index = syscon_uart_index - 1; /* User selected sys-console */ |
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299 | } |
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300 | |
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301 | /* Register Device Names |
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302 | * |
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303 | * 0 /dev/console - APBUART[USER-SELECTED, DEFAULT=APBUART[0]] |
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304 | * 1 /dev/console_a - APBUART[0] (by default not present because is console) |
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305 | * 2 /dev/console_b - APBUART[1] |
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306 | * ... |
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307 | * |
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308 | * On a MP system one should not open UARTs that other OS instances use. |
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309 | */ |
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310 | if (syscon_uart_index < uarts) { |
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311 | status = rtems_io_register_name("/dev/console", major, 0); |
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312 | if (status != RTEMS_SUCCESSFUL) |
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313 | rtems_fatal_error_occurred(status); |
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314 | } |
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315 | strcpy(console_name,"/dev/console_a"); |
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316 | for (i = 0; i < uarts; i++) { |
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317 | if (i == syscon_uart_index) |
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318 | continue; /* skip UART that is registered as /dev/console */ |
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319 | console_name[13] = 'a' + i; |
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320 | status = rtems_io_register_name( console_name, major, i+1); |
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321 | } |
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322 | |
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323 | return RTEMS_SUCCESSFUL; |
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324 | } |
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325 | |
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326 | #if CONSOLE_USE_INTERRUPTS |
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327 | static struct rtems_termios_tty *leon3_console_get_tty( |
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328 | rtems_libio_open_close_args_t *args |
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329 | ) |
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330 | { |
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331 | return args->iop->data1; |
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332 | } |
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333 | #endif |
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334 | |
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335 | static int leon3_console_first_open(int major, int minor, void *arg) |
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336 | { |
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337 | struct apbuart_priv *uart = leon3_console_get_uart(minor); |
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338 | |
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339 | #if CONSOLE_USE_INTERRUPTS |
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340 | rtems_status_code sc; |
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341 | |
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342 | uart->cookie = leon3_console_get_tty(arg); |
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343 | |
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344 | /* Register Interrupt handler */ |
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345 | sc = rtems_interrupt_handler_install(uart->irq, "console", |
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346 | RTEMS_INTERRUPT_SHARED, |
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347 | leon3_console_isr, |
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348 | uart); |
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349 | if (sc != RTEMS_SUCCESSFUL) |
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350 | return -1; |
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351 | |
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352 | uart->sending = 0; |
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353 | /* Enable Receiver and transmitter and Turn on RX interrupts */ |
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354 | uart->regs->ctrl |= LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE | |
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355 | LEON_REG_UART_CTRL_RI; |
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356 | #else |
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357 | /* Initialize UART on opening */ |
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358 | uart->regs->ctrl |= LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE; |
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359 | #endif |
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360 | uart->regs->status = 0; |
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361 | |
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362 | return 0; |
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363 | } |
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364 | |
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365 | #if CONSOLE_USE_INTERRUPTS |
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366 | static int leon3_console_last_close(int major, int minor, void *arg) |
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367 | { |
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368 | struct rtems_termios_tty *tty = leon3_console_get_tty(arg); |
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369 | struct apbuart_priv *uart = leon3_console_get_uart(minor); |
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370 | rtems_interrupt_level level; |
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371 | |
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372 | /* Turn off RX interrupts */ |
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373 | rtems_termios_interrupt_lock_acquire(tty, level); |
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374 | uart->regs->ctrl &= ~(LEON_REG_UART_CTRL_RI); |
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375 | rtems_termios_interrupt_lock_release(tty, level); |
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376 | |
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377 | /**** Flush device ****/ |
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378 | while (uart->sending) { |
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379 | /* Wait until all data has been sent */ |
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380 | } |
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381 | |
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382 | /* uninstall ISR */ |
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383 | rtems_interrupt_handler_remove(uart->irq, leon3_console_isr, uart); |
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384 | |
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385 | return 0; |
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386 | } |
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387 | #endif |
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388 | |
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389 | rtems_device_driver console_open( |
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390 | rtems_device_major_number major, |
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391 | rtems_device_minor_number minor, |
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392 | void * arg |
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393 | ) |
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394 | { |
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395 | #if CONSOLE_USE_INTERRUPTS |
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396 | /* Interrupt mode routines */ |
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397 | static const rtems_termios_callbacks Callbacks = { |
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398 | leon3_console_first_open, /* firstOpen */ |
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399 | leon3_console_last_close, /* lastClose */ |
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400 | NULL, /* pollRead */ |
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401 | leon3_console_write_support, /* write */ |
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402 | leon3_console_set_attributes,/* setAttributes */ |
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403 | NULL, /* stopRemoteTx */ |
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404 | NULL, /* startRemoteTx */ |
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405 | 1 /* outputUsesInterrupts */ |
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406 | }; |
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407 | #else |
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408 | /* Polling mode routines */ |
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409 | static const rtems_termios_callbacks Callbacks = { |
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410 | leon3_console_first_open, /* firstOpen */ |
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411 | NULL, /* lastClose */ |
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412 | leon3_console_pollRead, /* pollRead */ |
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413 | leon3_console_write_polled, /* write */ |
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414 | leon3_console_set_attributes,/* setAttributes */ |
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415 | NULL, /* stopRemoteTx */ |
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416 | NULL, /* startRemoteTx */ |
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417 | 0 /* outputUsesInterrupts */ |
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418 | }; |
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419 | #endif |
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420 | |
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421 | assert(minor <= uarts); |
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422 | if (minor > uarts || minor == (syscon_uart_index + 1)) |
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423 | return RTEMS_INVALID_NUMBER; |
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424 | |
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425 | return rtems_termios_open(major, minor, arg, &Callbacks); |
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426 | } |
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427 | |
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428 | rtems_device_driver console_close( |
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429 | rtems_device_major_number major, |
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430 | rtems_device_minor_number minor, |
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431 | void * arg |
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432 | ) |
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433 | { |
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434 | return rtems_termios_close(arg); |
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435 | } |
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436 | |
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437 | rtems_device_driver console_read( |
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438 | rtems_device_major_number major, |
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439 | rtems_device_minor_number minor, |
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440 | void * arg |
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441 | ) |
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442 | { |
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443 | return rtems_termios_read(arg); |
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444 | } |
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445 | |
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446 | rtems_device_driver console_write( |
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447 | rtems_device_major_number major, |
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448 | rtems_device_minor_number minor, |
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449 | void * arg |
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450 | ) |
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451 | { |
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452 | return rtems_termios_write(arg); |
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453 | } |
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454 | |
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455 | rtems_device_driver console_control( |
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456 | rtems_device_major_number major, |
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457 | rtems_device_minor_number minor, |
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458 | void * arg |
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459 | ) |
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460 | { |
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461 | return rtems_termios_ioctl(arg); |
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462 | } |
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463 | |
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