1 | /* Register i2c bus driver & devices */ |
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2 | |
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3 | /* |
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4 | * Authorship |
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5 | * ---------- |
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6 | * This software ('mvme3100' RTEMS BSP) was created by |
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7 | * |
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8 | * Till Straumann <strauman@slac.stanford.edu>, 2005-2007, |
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9 | * Stanford Linear Accelerator Center, Stanford University. |
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10 | * |
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11 | * Acknowledgement of sponsorship |
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12 | * ------------------------------ |
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13 | * The 'mvme3100' BSP was produced by |
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14 | * the Stanford Linear Accelerator Center, Stanford University, |
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15 | * under Contract DE-AC03-76SFO0515 with the Department of Energy. |
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16 | * |
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17 | * Government disclaimer of liability |
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18 | * ---------------------------------- |
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19 | * Neither the United States nor the United States Department of Energy, |
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20 | * nor any of their employees, makes any warranty, express or implied, or |
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21 | * assumes any legal liability or responsibility for the accuracy, |
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22 | * completeness, or usefulness of any data, apparatus, product, or process |
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23 | * disclosed, or represents that its use would not infringe privately owned |
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24 | * rights. |
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25 | * |
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26 | * Stanford disclaimer of liability |
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27 | * -------------------------------- |
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28 | * Stanford University makes no representations or warranties, express or |
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29 | * implied, nor assumes any liability for the use of this software. |
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30 | * |
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31 | * Stanford disclaimer of copyright |
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32 | * -------------------------------- |
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33 | * Stanford University, owner of the copyright, hereby disclaims its |
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34 | * copyright and all other rights in this software. Hence, anyone may |
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35 | * freely use it for any purpose without restriction. |
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36 | * |
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37 | * Maintenance of notices |
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38 | * ---------------------- |
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39 | * In the interest of clarity regarding the origin and status of this |
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40 | * SLAC software, this and all the preceding Stanford University notices |
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41 | * are to remain affixed to any copy or derivative of this software made |
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42 | * or distributed by the recipient and are to be affixed to any copy of |
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43 | * software made or distributed by the recipient that contains a copy or |
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44 | * derivative of this software. |
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45 | * |
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46 | * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 |
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47 | */ |
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48 | |
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49 | #include <rtems.h> |
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50 | #include <bsp.h> |
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51 | #include <rtems/bspIo.h> |
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52 | #include <rtems/libi2c.h> |
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53 | #include <libchip/i2c-2b-eeprom.h> |
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54 | #include <libchip/i2c-ds1621.h> |
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55 | #include <bsp/mpc8540_i2c_busdrv.h> |
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56 | #include <rtems/libio.h> |
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57 | #include <rtems/score/sysstate.h> |
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58 | |
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59 | #include <stdio.h> |
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60 | #include <sys/stat.h> |
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61 | #include <errno.h> |
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62 | #include <stdarg.h> |
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63 | |
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64 | static void |
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65 | safe_printf (const char *fmt, ...) |
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66 | { |
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67 | va_list ap; |
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68 | |
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69 | va_start(ap, fmt); |
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70 | if ( _System_state_Is_up( _System_state_Get() ) ) |
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71 | vfprintf( stderr, fmt, ap ); |
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72 | else |
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73 | vprintk( fmt, ap ); |
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74 | va_end(ap); |
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75 | } |
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76 | |
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77 | static void |
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78 | safe_perror(const char *s) |
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79 | { |
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80 | safe_printf("%s :%s\n", s, strerror(errno)); |
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81 | } |
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82 | |
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83 | |
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84 | int |
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85 | BSP_i2c_initialize(void) |
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86 | { |
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87 | int busno, succ = 0; |
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88 | |
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89 | /* Initialize the library */ |
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90 | if ( rtems_libi2c_initialize() ) { |
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91 | safe_printf("Initializing I2C library failed\n"); |
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92 | return -1; |
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93 | } |
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94 | |
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95 | /* Register our bus driver */ |
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96 | if ( (busno=rtems_libi2c_register_bus( |
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97 | BSP_I2C_BUS0_NAME, |
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98 | BSP_I2C_BUS_DESCRIPTOR) ) < 0 ) { |
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99 | safe_perror("Registering mpc8540 i2c bus driver"); |
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100 | return -1; |
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101 | } |
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102 | |
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103 | /* Now register higher level drivers; note that |
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104 | * the i2c address in the manual is actually left-shifted |
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105 | * by one bit, i.e., as it would go on the bus. |
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106 | */ |
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107 | |
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108 | /* Use read-only driver for VPD */ |
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109 | if ( rtems_libi2c_register_drv( |
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110 | BSP_I2C_VPD_EEPROM_NAME, |
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111 | i2c_2b_eeprom_ro_driver_descriptor, |
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112 | busno, |
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113 | BSP_VPD_I2C_ADDR) < 0 ) { |
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114 | safe_perror("Registering i2c VPD eeprom driver failed"); |
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115 | } else { |
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116 | succ++; |
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117 | } |
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118 | |
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119 | /* Use read-write driver for user eeprom -- you still might |
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120 | * have to disable HW write-protection on your board. |
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121 | */ |
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122 | if ( rtems_libi2c_register_drv( |
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123 | BSP_I2C_USR_EEPROM_NAME, |
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124 | i2c_2b_eeprom_driver_descriptor, |
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125 | busno, |
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126 | BSP_USR0_I2C_ADDR) < 0 ) { |
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127 | safe_perror("Registering i2c 1st USR eeprom driver failed"); |
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128 | } else { |
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129 | succ++; |
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130 | } |
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131 | |
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132 | /* Use read-write driver for user eeprom -- you still might |
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133 | * have to disable HW write-protection on your board. |
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134 | */ |
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135 | if ( rtems_libi2c_register_drv( |
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136 | BSP_I2C_USR1_EEPROM_NAME, |
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137 | i2c_2b_eeprom_driver_descriptor, |
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138 | busno, |
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139 | BSP_USR1_I2C_ADDR) < 0 ) { |
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140 | safe_perror("Registering i2c 2nd USR eeprom driver failed"); |
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141 | } else { |
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142 | succ++; |
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143 | } |
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144 | |
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145 | /* The thermostat */ |
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146 | if ( rtems_libi2c_register_drv( |
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147 | BSP_I2C_DS1621_NAME, |
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148 | i2c_ds1621_driver_descriptor, |
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149 | busno, |
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150 | BSP_THM_I2C_ADDR) < 0 ) { |
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151 | safe_perror("Registering i2c ds1621 temp sensor. driver failed"); |
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152 | } else { |
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153 | succ++; |
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154 | } |
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155 | |
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156 | /* Finally, as an example, register raw access to the |
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157 | * ds1621. The driver above just reads the 8 msb of the |
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158 | * temperature but doesn't support anything else. Using |
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159 | * the raw device node you can write/read individual |
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160 | * control bytes yourself and e.g., program the thermostat... |
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161 | */ |
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162 | |
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163 | if ( mknod( |
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164 | BSP_I2C_DS1621_RAW_DEV_NAME, |
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165 | 0666 | S_IFCHR, |
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166 | rtems_filesystem_make_dev_t(rtems_libi2c_major, |
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167 | RTEMS_LIBI2C_MAKE_MINOR(busno,BSP_THM_I2C_ADDR))) ) { |
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168 | safe_perror("Creating device node for raw ds1621 (temp. sensor) access failed"); |
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169 | } else { |
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170 | succ++; |
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171 | } |
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172 | |
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173 | /* Raw access to RTC */ |
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174 | if ( mknod( |
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175 | BSP_I2C_DS1375_RAW_DEV_NAME, |
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176 | 0666 | S_IFCHR, |
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177 | rtems_filesystem_make_dev_t(rtems_libi2c_major, |
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178 | RTEMS_LIBI2C_MAKE_MINOR(busno,BSP_RTC_I2C_ADDR))) ) { |
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179 | safe_perror("Creating device node for raw ds1375 (rtc) access failed"); |
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180 | } else { |
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181 | succ++; |
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182 | } |
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183 | |
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184 | safe_printf("%i I2C devices registered\n", succ); |
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185 | return 0; |
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186 | } |
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