1 | /* video.c |
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2 | * |
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3 | * Milkymist video input driver for RTEMS |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.com/license/LICENSE. |
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8 | * |
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9 | * $Id$ |
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10 | * |
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11 | * COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq |
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12 | */ |
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13 | |
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14 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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15 | |
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16 | #include <stdlib.h> |
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17 | #include <stdio.h> |
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18 | #include <errno.h> |
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19 | #include <sys/types.h> |
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20 | #include <rtems.h> |
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21 | #include <bsp.h> |
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22 | #include <bsp/irq-generic.h> |
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23 | #include <rtems/libio.h> |
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24 | #include <rtems/status-checks.h> |
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25 | #include "../include/system_conf.h" |
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26 | #include "milkymist_video.h" |
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27 | |
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28 | #define DEVICE_NAME "/dev/video" |
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29 | #define N_BUFFERS 3 |
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30 | #define FRAME_W 720 |
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31 | #define FRAME_H 288 |
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32 | |
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33 | static bool buffers_locked[N_BUFFERS]; |
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34 | static void *buffers[N_BUFFERS]; |
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35 | static int last_buffer; |
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36 | static int current_buffer; |
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37 | |
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38 | static rtems_isr frame_handler(rtems_vector_number n) |
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39 | { |
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40 | int remaining_attempts; |
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41 | |
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42 | lm32_interrupt_ack(1 << MM_IRQ_VIDEOIN); |
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43 | |
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44 | last_buffer = current_buffer; |
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45 | |
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46 | /* get a new buffer */ |
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47 | remaining_attempts = N_BUFFERS; |
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48 | do { |
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49 | current_buffer++; |
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50 | if(current_buffer == N_BUFFERS) |
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51 | current_buffer = 0; |
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52 | remaining_attempts--; |
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53 | } while(buffers_locked[current_buffer] && (remaining_attempts > 0)); |
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54 | |
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55 | MM_WRITE(MM_BT656_BASE, (unsigned int)buffers[current_buffer]); |
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56 | |
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57 | if(buffers_locked[current_buffer]) |
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58 | printk("Failed to find unlocked buffer\n"); |
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59 | } |
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60 | |
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61 | static void i2c_delay(void) |
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62 | { |
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63 | unsigned int i; |
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64 | |
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65 | for(i=0;i<1000;i++) __asm__("nop"); |
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66 | } |
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67 | |
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68 | /* I2C bit-banging functions from http://en.wikipedia.org/wiki/I2c */ |
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69 | static unsigned int i2c_read_bit(void) |
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70 | { |
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71 | unsigned int bit; |
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72 | |
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73 | /* Let the slave drive data */ |
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74 | MM_WRITE(MM_BT656_I2C, 0); |
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75 | i2c_delay(); |
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76 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDC); |
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77 | i2c_delay(); |
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78 | bit = MM_READ(MM_BT656_I2C) & BT656_I2C_SDAIN; |
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79 | i2c_delay(); |
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80 | MM_WRITE(MM_BT656_I2C, 0); |
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81 | return bit; |
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82 | } |
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83 | |
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84 | static void i2c_write_bit(unsigned int bit) |
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85 | { |
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86 | if(bit) { |
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87 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDAOUT); |
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88 | } else { |
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89 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE); |
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90 | } |
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91 | i2c_delay(); |
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92 | MM_WRITE(MM_BT656_I2C, MM_READ(MM_BT656_I2C) | BT656_I2C_SDC); |
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93 | i2c_delay(); |
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94 | MM_WRITE(MM_BT656_I2C, MM_READ(MM_BT656_I2C) & ~BT656_I2C_SDC); |
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95 | } |
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96 | |
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97 | static int i2c_started; |
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98 | |
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99 | static void i2c_start_cond(void) |
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100 | { |
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101 | if(i2c_started) { |
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102 | /* set SDA to 1 */ |
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103 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDAOUT); |
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104 | i2c_delay(); |
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105 | MM_WRITE(MM_BT656_I2C, MM_READ(MM_BT656_I2C) | BT656_I2C_SDC); |
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106 | } |
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107 | /* SCL is high, set SDA from 1 to 0 */ |
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108 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDC); |
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109 | i2c_delay(); |
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110 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE); |
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111 | i2c_started = 1; |
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112 | } |
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113 | |
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114 | static void i2c_stop_cond(void) |
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115 | { |
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116 | /* set SDA to 0 */ |
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117 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE); |
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118 | i2c_delay(); |
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119 | /* Clock stretching */ |
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120 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDC); |
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121 | /* SCL is high, set SDA from 0 to 1 */ |
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122 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDC); |
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123 | i2c_delay(); |
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124 | i2c_started = 0; |
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125 | } |
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126 | |
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127 | static unsigned int i2c_write(unsigned char byte) |
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128 | { |
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129 | unsigned int bit; |
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130 | unsigned int ack; |
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131 | |
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132 | for(bit = 0; bit < 8; bit++) { |
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133 | i2c_write_bit(byte & 0x80); |
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134 | byte <<= 1; |
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135 | } |
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136 | ack = !i2c_read_bit(); |
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137 | return ack; |
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138 | } |
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139 | |
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140 | static unsigned char i2c_read(int ack) |
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141 | { |
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142 | unsigned char byte = 0; |
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143 | unsigned int bit; |
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144 | |
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145 | for(bit = 0; bit < 8; bit++) { |
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146 | byte <<= 1; |
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147 | byte |= i2c_read_bit(); |
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148 | } |
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149 | i2c_write_bit(!ack); |
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150 | return byte; |
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151 | } |
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152 | |
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153 | static unsigned char read_reg(unsigned char addr) |
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154 | { |
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155 | unsigned char r; |
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156 | |
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157 | i2c_start_cond(); |
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158 | i2c_write(0x40); |
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159 | i2c_write(addr); |
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160 | i2c_start_cond(); |
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161 | i2c_write(0x41); |
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162 | r = i2c_read(0); |
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163 | i2c_stop_cond(); |
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164 | |
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165 | return r; |
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166 | } |
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167 | |
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168 | static void write_reg(unsigned char addr, unsigned char val) |
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169 | { |
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170 | i2c_start_cond(); |
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171 | i2c_write(0x40); |
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172 | i2c_write(addr); |
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173 | i2c_write(val); |
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174 | i2c_stop_cond(); |
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175 | } |
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176 | |
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177 | static const char vreg_addr[] = { |
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178 | 0x1d, 0xc3, 0xc4 |
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179 | }; |
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180 | |
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181 | static const char vreg_dat[] = { |
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182 | 0x40, 0x05, 0x80 |
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183 | }; |
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184 | |
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185 | rtems_device_driver video_initialize( |
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186 | rtems_device_major_number major, |
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187 | rtems_device_minor_number minor, |
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188 | void *arg |
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189 | ) |
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190 | { |
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191 | rtems_status_code sc; |
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192 | rtems_isr_entry dummy; |
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193 | int i; |
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194 | |
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195 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDC); |
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196 | |
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197 | sc = rtems_io_register_name(DEVICE_NAME, major, 0); |
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198 | RTEMS_CHECK_SC(sc, "create video input device"); |
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199 | |
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200 | rtems_interrupt_catch(frame_handler, MM_IRQ_VIDEOIN, &dummy); |
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201 | bsp_interrupt_vector_enable(MM_IRQ_VIDEOIN); |
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202 | |
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203 | for(i=0;i<sizeof(vreg_addr);i++) |
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204 | write_reg(vreg_addr[i], vreg_dat[i]); |
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205 | |
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206 | return RTEMS_SUCCESSFUL; |
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207 | } |
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208 | |
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209 | rtems_device_driver video_open( |
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210 | rtems_device_major_number major, |
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211 | rtems_device_minor_number minor, |
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212 | void *arg |
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213 | ) |
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214 | { |
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215 | int i; |
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216 | int status; |
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217 | |
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218 | for(i=0;i<N_BUFFERS;i++) { |
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219 | status = posix_memalign(&buffers[i], 32, 2*FRAME_W*FRAME_H); |
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220 | if(status != 0) { |
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221 | i--; |
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222 | while(i > 0) { |
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223 | free(buffers[i]); |
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224 | i--; |
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225 | } |
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226 | return RTEMS_UNSATISFIED; |
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227 | } |
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228 | } |
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229 | |
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230 | last_buffer = -1; |
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231 | current_buffer = 0; |
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232 | |
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233 | MM_WRITE(MM_BT656_BASE, (unsigned int)buffers[current_buffer]); |
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234 | MM_WRITE(MM_BT656_FILTERSTATUS, BT656_FILTER_FIELD1); |
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235 | |
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236 | return RTEMS_SUCCESSFUL; |
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237 | } |
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238 | |
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239 | rtems_device_driver video_close( |
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240 | rtems_device_major_number major, |
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241 | rtems_device_minor_number minor, |
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242 | void *arg |
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243 | ) |
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244 | { |
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245 | int i; |
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246 | |
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247 | MM_WRITE(MM_BT656_FILTERSTATUS, 0); |
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248 | while(MM_READ(MM_BT656_FILTERSTATUS) & BT656_FILTER_INFRAME); |
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249 | for(i=0;i<N_BUFFERS;i++) |
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250 | free(buffers[i]); |
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251 | return RTEMS_SUCCESSFUL; |
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252 | } |
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253 | |
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254 | static void invalidate_caches(void) |
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255 | { |
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256 | volatile char *flushbase = (char *)FMLBRG_FLUSH_BASE; |
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257 | int i, offset; |
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258 | |
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259 | offset = 0; |
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260 | for (i=0;i<FMLBRG_LINE_COUNT;i++) { |
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261 | flushbase[offset] = 0; |
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262 | offset += FMLBRG_LINE_LENGTH; |
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263 | } |
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264 | __asm__ volatile( /* Invalidate Level-1 data cache */ |
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265 | "wcsr DCC, r0\n" |
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266 | "nop\n" |
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267 | ); |
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268 | } |
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269 | |
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270 | rtems_device_driver video_control( |
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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_libio_ioctl_args_t *args = arg; |
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277 | unsigned int *a = (unsigned int *)args->buffer; |
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278 | rtems_status_code sc; |
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279 | |
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280 | switch (args->command) { |
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281 | case VIDEO_BUFFER_LOCK: |
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282 | if (last_buffer == -1) { |
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283 | *a = 0; |
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284 | } else { |
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285 | bsp_interrupt_vector_disable(MM_IRQ_VIDEOIN); |
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286 | if(*a) invalidate_caches(); |
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287 | *a = (unsigned int)buffers[last_buffer]; |
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288 | buffers_locked[last_buffer] = true; |
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289 | bsp_interrupt_vector_enable(MM_IRQ_VIDEOIN); |
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290 | } |
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291 | sc = RTEMS_SUCCESSFUL; |
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292 | break; |
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293 | case VIDEO_BUFFER_UNLOCK: { |
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294 | int i; |
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295 | for(i=0;i<N_BUFFERS;i++) { |
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296 | if ((unsigned int)buffers[i] == (unsigned int)a) { |
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297 | buffers_locked[i] = false; |
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298 | break; |
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299 | } |
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300 | } |
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301 | sc = RTEMS_SUCCESSFUL; |
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302 | break; |
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303 | } |
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304 | |
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305 | case VIDEO_SET_BRIGHTNESS: |
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306 | write_reg(0x0a, (unsigned int)a); |
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307 | sc = RTEMS_SUCCESSFUL; |
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308 | break; |
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309 | case VIDEO_GET_BRIGHTNESS: |
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310 | *a = read_reg(0x0a); |
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311 | sc = RTEMS_SUCCESSFUL; |
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312 | break; |
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313 | case VIDEO_SET_CONTRAST: |
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314 | write_reg(0x08, (unsigned int)a); |
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315 | sc = RTEMS_SUCCESSFUL; |
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316 | break; |
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317 | case VIDEO_GET_CONTRAST: |
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318 | *a = read_reg(0x08); |
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319 | sc = RTEMS_SUCCESSFUL; |
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320 | break; |
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321 | case VIDEO_SET_HUE: |
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322 | write_reg(0x0b, (unsigned int)a); |
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323 | sc = RTEMS_SUCCESSFUL; |
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324 | break; |
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325 | case VIDEO_GET_HUE: |
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326 | *a = read_reg(0x0b); |
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327 | sc = RTEMS_SUCCESSFUL; |
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328 | break; |
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329 | |
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330 | case VIDEO_GET_SIGNAL: |
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331 | *a = read_reg(0x10); |
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332 | sc = RTEMS_SUCCESSFUL; |
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333 | break; |
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334 | |
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335 | case VIDEO_SET_REGISTER: |
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336 | write_reg(((unsigned int )a & 0xffff0000) >> 16, |
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337 | (unsigned int)a & 0x0000ffff); |
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338 | sc = RTEMS_SUCCESSFUL; |
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339 | break; |
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340 | case VIDEO_GET_REGISTER: |
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341 | *a = read_reg(*a); |
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342 | sc = RTEMS_SUCCESSFUL; |
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343 | break; |
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344 | |
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345 | default: |
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346 | sc = RTEMS_UNSATISFIED; |
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347 | break; |
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348 | } |
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349 | |
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350 | if (sc == RTEMS_SUCCESSFUL) |
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351 | args->ioctl_return = 0; |
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352 | else |
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353 | args->ioctl_return = -1; |
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354 | |
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355 | return sc; |
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356 | } |
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