1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup arm_beagle |
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5 | * |
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6 | * @brief RTC driver for AM335x SoC. |
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7 | * |
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8 | */ |
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9 | |
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10 | /* |
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11 | * Copyright (c) 2015 Ragunath <ragunath3252@gmail.com>. |
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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 | #include <bspopts.h> |
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19 | |
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20 | #if IS_AM335X |
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21 | #include <rtems.h> |
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22 | #include <bsp.h> |
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23 | #include <time.h> |
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24 | #include <libchip/rtc.h> |
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25 | #include <libcpu/omap3.h> |
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26 | |
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27 | #define setbit(a,x) (a | (1<<x)) |
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28 | #define bcd(a) ((a & 0x0f)+ (((a & 0xf0) >> 4 )*10)) |
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29 | #define dec(a) (((a / 10) << 4) | (a % 10)) |
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30 | #define WRITE_WAIT_MAX_COUNT 10000 |
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31 | |
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32 | size_t RTC_Count = 1; |
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33 | |
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34 | static void rtc_write_enable(void); |
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35 | static void rtc_write_disable(void); |
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36 | static int rtc_write_wait(void); |
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37 | static void rtc_clk_init(void); |
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38 | void rtc_init(int minor); |
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39 | void print_time(void); |
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40 | int am335x_rtc_gettime(int minor,rtems_time_of_day *t); |
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41 | int am335x_rtc_settime(int minor, const rtems_time_of_day *t); |
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42 | void am335x_rtc_debug(void); |
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43 | |
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44 | /* |
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45 | * probe for a rtc. we always claim to have one. |
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46 | */ |
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47 | static bool am335x_rtc_probe (int minor) |
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48 | { |
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49 | return true; |
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50 | } |
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51 | |
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52 | /* |
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53 | * Write key values to kick0 and kick1 registers to enable write access |
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54 | */ |
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55 | static void rtc_write_enable(void) |
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56 | { |
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57 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK0,AM335X_RTC_KICK0_KEY); |
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58 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK1,AM335X_RTC_KICK1_KEY); |
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59 | } |
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60 | |
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61 | /* |
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62 | * Write random (0x11111111) value to kick0 and kick1 registers to disable write access |
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63 | */ |
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64 | static void rtc_write_disable(void) |
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65 | { |
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66 | /* Write some random value other than key to disable*/ |
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67 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK0,0x11111111); |
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68 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_KICK1,0x11111111); |
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69 | } |
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70 | |
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71 | /* |
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72 | * Wait till busy bit is reset |
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73 | */ |
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74 | static int rtc_write_wait(void) |
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75 | { |
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76 | int i = WRITE_WAIT_MAX_COUNT; |
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77 | while((mmio_read(AM335X_RTC_BASE+AM335X_RTC_STATUS_REG) & 0x1) && (i--)); |
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78 | |
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79 | if(i == 0) |
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80 | return RTEMS_RESOURCE_IN_USE; |
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81 | else |
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82 | return RTEMS_SUCCESSFUL; |
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83 | } |
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84 | |
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85 | |
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86 | /* |
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87 | * Initialize RTC clock |
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88 | */ |
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89 | static void rtc_clk_init(void) |
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90 | { |
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91 | uint32_t a = 0x0; |
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92 | |
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93 | a = setbit(a,1); |
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94 | /* IDLEST = 0x0 & MODULEMODE = 0x1*/ |
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95 | mmio_write(CM_RTC_BASE+CM_RTC_RTC_CLKCTRL,a); |
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96 | a = 0x0; |
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97 | |
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98 | /*32K rtc clock active*/ |
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99 | a = setbit(a,9); |
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100 | a = setbit(a,8); |
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101 | mmio_write(CM_RTC_BASE+CM_RTC_CLKSTCTRL,a); |
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102 | } |
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103 | |
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104 | void rtc_init(int minor) |
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105 | { |
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106 | uint32_t a = 0x0; |
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107 | |
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108 | rtc_clk_init(); |
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109 | /* |
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110 | * Steps to enable RTC |
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111 | * 1. Enable the module clock domains (rtc_clk_init). |
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112 | * 2. Enable the RTC module using CTRL_REG.RTC_disable. (Default enabled. Nothing done) |
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113 | * 3. Enable the 32K clock from PER PLL, if using the internal RTC oscillator. |
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114 | * 4. Write to the kick registers (KICK0R, KICK1R) in the RTC. |
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115 | * 5. Configure the timer in RTCSS for desired application (set time and date, alarm wakeup, and so on). |
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116 | * 6. Start the RTC (in CTRL_REG.STOP_RTC). |
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117 | */ |
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118 | rtc_write_enable(); |
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119 | a = setbit(a,0); |
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120 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_SYSCONFIG,a); |
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121 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_OSC_CLOCK); |
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122 | a = setbit(a,6); |
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123 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_OSC_CLOCK,a); |
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124 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_CTRL_REG); |
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125 | a = setbit(a,0); |
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126 | mmio_write(AM335X_RTC_BASE+AM335X_RTC_CTRL_REG,a); |
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127 | |
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128 | rtc_write_disable(); |
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129 | } |
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130 | |
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131 | int am335x_rtc_gettime(int minor,rtems_time_of_day *t) |
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132 | { |
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133 | uint32_t a = 0x0; |
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134 | |
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135 | if(minor != 0) |
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136 | return RTEMS_INVALID_NUMBER; |
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137 | |
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138 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_SECS); |
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139 | t->second = bcd(a); |
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140 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MINS); |
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141 | t->minute = bcd(a); |
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142 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_HOURS); |
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143 | t->hour = bcd(a); |
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144 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_DAYS); |
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145 | t->day = bcd(a); |
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146 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MONTHS); |
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147 | t->month = bcd(a); |
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148 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_YEARS); |
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149 | t->year = bcd(a)+2000; |
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150 | t->ticks=0; |
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151 | return RTEMS_SUCCESSFUL; |
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152 | } |
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153 | |
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154 | int am335x_rtc_settime(int minor,const rtems_time_of_day *t) |
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155 | { |
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156 | uint32_t a=0x0; |
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157 | int rv; |
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158 | |
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159 | if(minor != 0) |
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160 | return RTEMS_INVALID_NUMBER; |
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161 | |
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162 | rtc_write_enable(); |
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163 | |
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164 | /* Wait till the busy bit is reset to write again*/ |
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165 | a = t->second; |
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166 | rv=rtc_write_wait(); |
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167 | if(rv != RTEMS_SUCCESSFUL) |
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168 | return rv; |
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169 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_SECS,dec(a) & 0x7f); |
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170 | |
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171 | a = t->minute; |
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172 | rv=rtc_write_wait(); |
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173 | if(rv != RTEMS_SUCCESSFUL) |
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174 | return rv; |
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175 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_MINS,dec(a) & 0x7f); |
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176 | |
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177 | a = t->hour; |
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178 | rv=rtc_write_wait(); |
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179 | if(rv != RTEMS_SUCCESSFUL) |
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180 | return rv; |
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181 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_HOURS,dec(a) & 0x3f); |
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182 | |
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183 | a = t->day; |
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184 | rv=rtc_write_wait(); |
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185 | if(rv != RTEMS_SUCCESSFUL) |
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186 | return rv; |
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187 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_DAYS,dec(a) & 0x3f); |
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188 | |
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189 | a = t->month; |
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190 | rv=rtc_write_wait(); |
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191 | if(rv != RTEMS_SUCCESSFUL) |
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192 | return rv; |
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193 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_MONTHS,dec(a) & 0x1f); |
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194 | |
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195 | a = t->year; |
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196 | rv=rtc_write_wait(); |
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197 | if(rv != RTEMS_SUCCESSFUL) |
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198 | return rv; |
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199 | a = mmio_write(AM335X_RTC_BASE+AM335X_RTC_YEARS,(dec(a)%100) & 0xff); |
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200 | |
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201 | rtc_write_disable(); |
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202 | return rv; |
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203 | } |
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204 | |
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205 | #if BBB_DEBUG |
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206 | void print_time(void) |
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207 | { |
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208 | uint32_t a = 0x0; |
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209 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_SECS); |
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210 | printk("\n\rSecs %x",a); |
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211 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MINS); |
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212 | printk("\n\rMins %x",a); |
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213 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_HOURS); |
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214 | printk("\n\rHours %x",a); |
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215 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_DAYS); |
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216 | printk("\n\rDays %x",a); |
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217 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_MONTHS); |
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218 | printk("\n\r Months %x",a); |
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219 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_YEARS); |
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220 | printk("\n\rYears %x",a); |
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221 | a = mmio_read(AM335X_RTC_BASE+AM335X_RTC_WEEKS); |
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222 | printk("\n\rWeeks %x",a); |
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223 | } |
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224 | |
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225 | void am335x_rtc_debug(void) |
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226 | { |
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227 | int i; |
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228 | rtems_time_of_day t,r; |
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229 | |
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230 | t.second = 1; |
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231 | t.minute = 1; |
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232 | t.hour = 1; |
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233 | t.day = 7; |
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234 | t.month = 3; |
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235 | t. year = 2015; |
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236 | |
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237 | am335x_rtc_settime(0,&t); |
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238 | am335x_rtc_gettime(0,&r); |
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239 | |
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240 | printk("Secs %x",r.second); |
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241 | printk("Mins %x",r.minute); |
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242 | printk("Hours %x",r.hour); |
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243 | printk("Days %x",r.day); |
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244 | printk("Months %x",r.month); |
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245 | printk("Years %x",r.year); |
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246 | } |
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247 | #endif |
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248 | |
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249 | /* |
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250 | * driver function table. |
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251 | */ |
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252 | rtc_fns am335x_rtc_fns = { |
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253 | rtc_init, |
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254 | am335x_rtc_gettime, |
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255 | am335x_rtc_settime |
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256 | }; |
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257 | |
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258 | /* |
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259 | * the following table configures the RTC drivers used in this BSP |
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260 | */ |
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261 | |
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262 | rtc_tbl RTC_Table[] = { |
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263 | { |
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264 | "/dev/rtc", /* sDeviceName */ |
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265 | RTC_CUSTOM, /* deviceType */ |
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266 | &am335x_rtc_fns, /* pDeviceFns */ |
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267 | am335x_rtc_probe, /* deviceProbe */ |
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268 | NULL, /* pDeviceParams */ |
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269 | 0, /* ulCtrlPort1 */ |
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270 | 0, /* ulDataPort */ |
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271 | NULL, /* getRegister */ |
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272 | NULL /* setRegister */ |
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273 | } |
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274 | }; |
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275 | |
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276 | #endif |
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