1 | /* |
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2 | * console driver for S3C2400 UARTs |
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3 | * |
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4 | * This driver uses the shared console driver in |
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5 | * ...../libbsp/shared/console.c |
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6 | * |
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7 | * If you want the driver to be interrupt driven, you |
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8 | * need to write the ISR, and in the ISR insert the |
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9 | * chars into termios's queue. |
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10 | * |
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11 | * Copyright (c) 2004 Cogent Computer Systems |
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12 | * Written by Jay Monkman <jtm@lopingdog.com> |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | #include <bsp.h> /* Must be before libio.h */ |
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19 | #include <rtems/libio.h> |
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20 | #include <termios.h> |
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21 | #include <rtems/bspIo.h> |
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22 | |
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23 | /* Put the CPU (or UART) specific header file #include here */ |
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24 | #include <s3c24xx.h> |
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25 | #include <libchip/serial.h> |
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26 | #include <libchip/sersupp.h> |
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27 | |
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28 | /* How many serial ports? */ |
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29 | #define NUM_DEVS 1 |
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30 | |
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31 | int uart_poll_read(int minor); |
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32 | |
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33 | int dbg_dly; |
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34 | |
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35 | /* static function prototypes */ |
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36 | static int uart_first_open(int major, int minor, void *arg); |
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37 | static int uart_last_close(int major, int minor, void *arg); |
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38 | static int uart_read(int minor); |
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39 | static ssize_t uart_write(int minor, const char *buf, size_t len); |
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40 | static void uart_init(int minor); |
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41 | static void uart_write_polled(int minor, char c); |
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42 | static int uart_set_attributes(int minor, const struct termios *t); |
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43 | |
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44 | /* These are used by code in console.c */ |
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45 | unsigned long Console_Configuration_Count = NUM_DEVS; |
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46 | |
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47 | /* Pointers to functions for handling the UART. */ |
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48 | const console_fns uart_fns = |
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49 | { |
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50 | libchip_serial_default_probe, |
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51 | uart_first_open, |
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52 | uart_last_close, |
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53 | uart_read, |
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54 | uart_write, |
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55 | uart_init, |
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56 | uart_write_polled, /* not used in this driver */ |
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57 | uart_set_attributes, |
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58 | FALSE /* TRUE if interrupt driven, FALSE if not. */ |
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59 | }; |
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60 | |
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61 | /* |
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62 | * There's one item in array for each UART. |
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63 | * |
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64 | * Some of these fields are marked "NOT USED". They are not used |
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65 | * by console.c, but may be used by drivers in libchip |
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66 | * |
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67 | */ |
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68 | console_tbl Console_Configuration_Ports[] = { |
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69 | { |
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70 | "/dev/com0", /* sDeviceName */ |
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71 | SERIAL_CUSTOM, /* deviceType */ |
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72 | &uart_fns, /* pDeviceFns */ |
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73 | NULL, /* deviceProbe */ |
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74 | NULL, /* pDeviceFlow */ |
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75 | 0, /* ulMargin - NOT USED */ |
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76 | 0, /* ulHysteresis - NOT USED */ |
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77 | NULL, /* pDeviceParams */ |
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78 | 0, /* ulCtrlPort1 - NOT USED */ |
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79 | 0, /* ulCtrlPort2 - NOT USED */ |
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80 | 0, /* ulDataPort - NOT USED */ |
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81 | NULL, /* getRegister - NOT USED */ |
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82 | NULL, /* setRegister - NOT USED */ |
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83 | NULL, /* getData - NOT USED */ |
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84 | NULL, /* setData - NOT USED */ |
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85 | 0, /* ulClock - NOT USED */ |
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86 | 0 /* ulIntVector - NOT USED */ |
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87 | } |
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88 | }; |
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89 | |
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90 | /*********************************************************************/ |
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91 | /* Functions called via termios callbacks (i.e. the ones in uart_fns */ |
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92 | /*********************************************************************/ |
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93 | |
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94 | /* |
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95 | * This is called the first time each device is opened. If the driver |
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96 | * is interrupt driven, you should enable interrupts here. Otherwise, |
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97 | * it's probably safe to do nothing. |
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98 | * |
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99 | * Since micromonitor already set up the UART, we do nothing. |
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100 | */ |
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101 | static int uart_first_open(int major, int minor, void *arg) |
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102 | { |
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103 | return 0; |
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104 | } |
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105 | |
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106 | |
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107 | /* |
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108 | * This is called the last time each device is closed. If the driver |
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109 | * is interrupt driven, you should disable interrupts here. Otherwise, |
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110 | * it's probably safe to do nothing. |
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111 | */ |
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112 | static int uart_last_close(int major, int minor, void *arg) |
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113 | { |
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114 | return 0; |
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115 | } |
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116 | |
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117 | |
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118 | /* |
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119 | * Read one character from UART. |
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120 | * |
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121 | * Return -1 if there's no data, otherwise return |
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122 | * the character in lowest 8 bits of returned int. |
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123 | */ |
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124 | static int uart_read(int minor) |
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125 | { |
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126 | char c; |
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127 | |
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128 | if (minor == 0) { |
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129 | if (rUTRSTAT0 & 0x1) { |
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130 | c = rURXH0 & 0xff; |
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131 | return c; |
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132 | } else { |
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133 | return -1; |
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134 | } |
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135 | } else { |
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136 | printk("Unknown console minor number: %d\n", minor); |
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137 | return -1; |
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138 | } |
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139 | |
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140 | } |
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141 | |
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142 | |
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143 | /* |
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144 | * Write buffer to UART |
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145 | * |
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146 | * return 1 on success, -1 on error |
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147 | */ |
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148 | static ssize_t uart_write(int minor, const char *buf, size_t len) |
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149 | { |
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150 | int i; |
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151 | |
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152 | if (minor == 0) { |
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153 | for (i = 0; i < len; i++) { |
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154 | /* Wait for fifo to have room */ |
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155 | while(!(rUTRSTAT0 & 0x2)) { |
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156 | continue; |
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157 | } |
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158 | |
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159 | rUTXH0 = (char) buf[i]; |
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160 | } |
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161 | } else { |
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162 | printk("Unknown console minor number: %d\n", minor); |
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163 | return -1; |
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164 | } |
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165 | |
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166 | return 1; |
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167 | } |
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168 | |
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169 | |
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170 | /* Set up the UART. */ |
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171 | static void uart_init(int minor) |
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172 | { |
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173 | int i; |
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174 | unsigned int reg = 0; |
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175 | |
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176 | /* enable UART0 */ |
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177 | rCLKCON|=0x100; |
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178 | |
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179 | /* value is calculated so : (int)(PCLK/16./baudrate) -1 */ |
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180 | reg = get_PCLK() / (16 * 115200) - 1; |
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181 | |
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182 | /* FIFO enable, Tx/Rx FIFO clear */ |
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183 | rUFCON0 = 0x07; |
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184 | rUMCON0 = 0x0; |
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185 | /* Normal,No parity,1 stop,8 bit */ |
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186 | rULCON0 = 0x3; |
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187 | /* |
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188 | * tx=level,rx=edge,disable timeout int.,enable rx error int., |
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189 | * normal,interrupt or polling |
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190 | */ |
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191 | rUCON0 = 0x245; |
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192 | rUBRDIV0 = reg; |
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193 | |
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194 | for (i = 0; i < 100; i++); |
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195 | |
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196 | } |
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197 | |
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198 | /* I'm not sure this is needed for the shared console driver. */ |
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199 | static void uart_write_polled(int minor, char c) |
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200 | { |
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201 | uart_write(minor, &c, 1); |
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202 | } |
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203 | |
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204 | /* This is for setting baud rate, bits, etc. */ |
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205 | static int uart_set_attributes(int minor, const struct termios *t) |
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206 | { |
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207 | return 0; |
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208 | } |
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209 | |
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210 | /***********************************************************************/ |
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211 | /* |
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212 | * The following functions are not used by TERMIOS, but other RTEMS |
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213 | * functions use them instead. |
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214 | */ |
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215 | /***********************************************************************/ |
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216 | /* |
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217 | * Read from UART. This is used in the exit code, and can't |
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218 | * rely on interrupts. |
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219 | */ |
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220 | int uart_poll_read(int minor) |
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221 | { |
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222 | return uart_read(minor); |
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223 | } |
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224 | |
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225 | |
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226 | /* |
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227 | * Write a character to the console. This is used by printk() and |
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228 | * maybe other low level functions. It should not use interrupts or any |
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229 | * RTEMS system calls. It needs to be very simple |
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230 | */ |
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231 | static void _BSP_put_char( char c ) { |
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232 | uart_write_polled(0, c); |
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233 | } |
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234 | |
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235 | BSP_output_char_function_type BSP_output_char = _BSP_put_char; |
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236 | |
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237 | static int _BSP_get_char(void) |
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238 | { |
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239 | return uart_poll_read(0); |
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240 | } |
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241 | |
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242 | BSP_polling_getchar_function_type BSP_poll_char = _BSP_get_char; |
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