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 BeagleBoard I2C bus initialization and API Support. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2016 Punit Vara <punitvara@gmail.com> |
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11 | * Copyright (c) 2017 Sichen Zhao <zsc19940506@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.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | /* |
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19 | * Modified on Punit Vara<punitvara@gmail.com> works, currently |
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20 | * the i2c file is working on the Beaglebone Black board(AM335x) |
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21 | */ |
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22 | |
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23 | #include <stdio.h> |
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24 | #include <bsp/i2c.h> |
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25 | #include <libcpu/am335x.h> |
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26 | #include <rtems/irq-extension.h> |
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27 | #include <rtems/counter.h> |
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28 | #include <bsp/bbb-gpio.h> |
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29 | #include <rtems/score/assert.h> |
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30 | |
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31 | static void am335x_i2c0_pinmux( bbb_i2c_bus *bus ) |
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32 | { |
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33 | REG( bus->regs + AM335X_CONF_I2C0_SDA ) = |
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34 | ( BBB_RXACTIVE | BBB_SLEWCTRL | BBB_PU_EN ); |
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35 | |
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36 | REG( bus->regs + AM335X_CONF_I2C0_SCL ) = |
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37 | ( BBB_RXACTIVE | BBB_SLEWCTRL | BBB_PU_EN ); |
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38 | } |
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39 | |
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40 | static void I2C0ModuleClkConfig( void ) |
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41 | { |
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42 | /* Writing to MODULEMODE field of AM335X_CM_WKUP_I2C0_CLKCTRL register. */ |
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43 | REG( AM335X_SOC_CM_WKUP_REGS + AM335X_CM_WKUP_I2C0_CLKCTRL ) |= |
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44 | AM335X_CM_WKUP_I2C0_CLKCTRL_MODULEMODE_ENABLE; |
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45 | |
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46 | /* Waiting for MODULEMODE field to reflect the written value. */ |
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47 | while ( AM335X_CM_WKUP_I2C0_CLKCTRL_MODULEMODE_ENABLE != |
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48 | ( REG( AM335X_SOC_CM_WKUP_REGS + AM335X_CM_WKUP_I2C0_CLKCTRL ) & |
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49 | AM335X_CM_WKUP_I2C0_CLKCTRL_MODULEMODE ) ) ; |
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50 | |
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51 | /* |
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52 | * Waiting for IDLEST field in AM335X_CM_WKUP_CONTROL_CLKCTRL |
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53 | * register to attain desired value. |
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54 | */ |
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55 | while ( ( AM335X_CM_WKUP_CONTROL_CLKCTRL_IDLEST_FUNC << |
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56 | AM335X_CM_WKUP_CONTROL_CLKCTRL_IDLEST_SHIFT ) != |
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57 | ( REG( AM335X_SOC_CM_WKUP_REGS + AM335X_CM_WKUP_CONTROL_CLKCTRL ) & |
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58 | AM335X_CM_WKUP_CONTROL_CLKCTRL_IDLEST ) ) ; |
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59 | |
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60 | /* |
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61 | * Waiting for CLKACTIVITY_I2C0_GFCLK field in AM335X_CM_WKUP_CLKSTCTRL |
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62 | * register to attain desired value. |
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63 | */ |
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64 | while ( AM335X_CM_WKUP_CLKSTCTRL_CLKACTIVITY_I2C0_GFCLK != |
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65 | ( REG( AM335X_SOC_CM_WKUP_REGS + AM335X_CM_WKUP_CLKSTCTRL ) & |
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66 | AM335X_CM_WKUP_CLKSTCTRL_CLKACTIVITY_I2C0_GFCLK ) ) ; |
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67 | |
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68 | /* |
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69 | * Waiting for IDLEST field in AM335X_CM_WKUP_I2C0_CLKCTRL register to attain |
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70 | * desired value. |
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71 | */ |
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72 | while ( ( AM335X_CM_WKUP_I2C0_CLKCTRL_IDLEST_FUNC << |
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73 | AM335X_CM_WKUP_I2C0_CLKCTRL_IDLEST_SHIFT ) != |
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74 | ( REG( AM335X_SOC_CM_WKUP_REGS + AM335X_CM_WKUP_I2C0_CLKCTRL ) & |
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75 | AM335X_CM_WKUP_I2C0_CLKCTRL_IDLEST ) ) ; |
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76 | } |
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77 | |
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78 | static void am335x_i2c_reset( bbb_i2c_bus *bus ) |
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79 | { |
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80 | volatile bbb_i2c_regs *regs = bus->regs; |
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81 | int timeout = I2C_TIMEOUT; |
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82 | |
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83 | if ( REG( ®s->BBB_I2C_CON ) & BBB_I2C_CON_EN ) { |
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84 | REG( ®s->BBB_I2C_CON ) = BBB_I2C_CON_CLR; |
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85 | udelay( 50000 ); |
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86 | } |
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87 | |
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88 | REG( ®s->BBB_I2C_SYSC ) = BBB_I2C_SYSC_SRST; /* for ES2 after soft reset */ |
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89 | udelay( 1000 ); |
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90 | REG( ®s->BBB_I2C_CON ) = BBB_I2C_CON_EN; |
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91 | |
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92 | while ( !( REG( ®s->BBB_I2C_SYSS ) & BBB_I2C_SYSS_RDONE ) && timeout-- ) { |
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93 | if ( timeout <= 0 ) { |
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94 | puts( "ERROR: Timeout in soft-reset\n" ); |
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95 | |
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96 | return; |
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97 | } |
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98 | |
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99 | udelay( 1000 ); |
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100 | } |
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101 | } |
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102 | /* |
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103 | * Possible values for msg->flag |
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104 | * - @ref I2C_M_TEN, |
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105 | * - @ref I2C_M_RD, |
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106 | * - @ref I2C_M_STOP, |
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107 | * - @ref I2C_M_NOSTART, |
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108 | * - @ref I2C_M_REV_DIR_ADDR, |
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109 | * - @ref I2C_M_IGNORE_NAK, |
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110 | * - @ref I2C_M_NO_RD_ACK, and |
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111 | * - @ref I2C_M_RECV_LEN. |
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112 | */ |
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113 | |
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114 | static void am335x_i2c_set_address_size( |
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115 | const i2c_msg *msgs, |
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116 | volatile bbb_i2c_regs *regs |
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117 | ) |
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118 | { |
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119 | /* |
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120 | * Can be configured multiple modes here. |
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121 | * Need to think about own address modes |
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122 | */ |
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123 | if ( ( msgs->flags & I2C_M_TEN ) == 0 ) { |
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124 | /* 7-bit mode slave address mode */ |
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125 | REG( ®s->BBB_I2C_CON ) = AM335X_I2C_CFG_7BIT_SLAVE_ADDR; |
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126 | } else { |
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127 | /* 10-bit slave address mode */ |
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128 | REG( ®s->BBB_I2C_CON ) = AM335X_I2C_CFG_10BIT_SLAVE_ADDR; |
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129 | } |
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130 | } |
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131 | |
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132 | static void am335x_i2c_next_byte( bbb_i2c_bus *bus ) |
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133 | { |
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134 | i2c_msg *msg; |
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135 | |
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136 | ++bus->msgs; |
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137 | --bus->msg_todo; |
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138 | msg = &bus->msgs[ 0 ]; |
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139 | bus->current_msg_todo = msg->len; |
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140 | bus->current_msg_byte = msg->buf; |
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141 | } |
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142 | |
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143 | static void am335x_i2c_masterint_enable( |
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144 | volatile bbb_i2c_regs *regs, |
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145 | unsigned int flag |
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146 | ) |
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147 | { |
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148 | REG( ®s->BBB_I2C_IRQENABLE_SET ) |= flag; |
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149 | } |
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150 | |
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151 | static void am335x_i2c_masterint_disable( |
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152 | volatile bbb_i2c_regs *regs, |
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153 | unsigned int flag |
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154 | ) |
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155 | { |
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156 | REG( ®s->BBB_I2C_IRQENABLE_CLR ) = flag; |
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157 | } |
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158 | |
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159 | static void am335x_int_clear( |
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160 | volatile bbb_i2c_regs *regs, |
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161 | unsigned int flag |
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162 | ) |
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163 | { |
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164 | REG( ®s->BBB_I2C_IRQSTATUS ) = flag; |
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165 | } |
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166 | |
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167 | static void am335x_clean_interrupts( volatile bbb_i2c_regs *regs ) |
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168 | { |
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169 | am335x_i2c_masterint_enable( regs, BBB_I2C_ALL_FLAGS ); |
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170 | am335x_int_clear( regs, BBB_I2C_ALL_FLAGS ); |
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171 | am335x_i2c_masterint_disable( regs, BBB_I2C_ALL_FLAGS ); |
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172 | } |
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173 | |
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174 | static void am335x_i2c_setup_read_transfer( |
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175 | bbb_i2c_bus *bus, |
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176 | volatile bbb_i2c_regs *regs, |
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177 | const i2c_msg *msgs, |
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178 | bool send_stop |
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179 | ) |
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180 | { |
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181 | REG( ®s->BBB_I2C_CNT ) = bus->current_msg_todo; |
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182 | |
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183 | REG( ®s->BBB_I2C_CON ) = AM335X_I2C_CFG_MST_RX | AM335X_I2C_CON_I2C_EN; |
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184 | |
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185 | if ( send_stop ) { |
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186 | REG( ®s->BBB_I2C_CON ) |= AM335X_I2C_CON_START | AM335X_I2C_CON_STOP; |
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187 | } else { |
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188 | REG( ®s->BBB_I2C_CON ) |= AM335X_I2C_CON_START; |
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189 | } |
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190 | |
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191 | am335x_i2c_masterint_enable( regs, AM335X_I2C_INT_RECV_READY | |
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192 | AM335X_I2C_IRQSTATUS_ARDY ); |
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193 | } |
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194 | |
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195 | static void am335x_i2c_continue_read_transfer( |
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196 | bbb_i2c_bus *bus, |
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197 | volatile bbb_i2c_regs *regs |
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198 | ) |
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199 | { |
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200 | bus->current_msg_byte[ bus->already_transferred ] = |
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201 | REG( ®s->BBB_I2C_DATA ); |
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202 | |
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203 | bus->already_transferred++; |
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204 | |
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205 | REG( ®s->BBB_I2C_IRQSTATUS ) = AM335X_I2C_INT_RECV_READY; |
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206 | |
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207 | if ( bus->already_transferred == bus->current_msg_todo - 1 ) { |
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208 | REG( ®s->BBB_I2C_CON ) |= AM335X_I2C_CON_STOP; |
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209 | } |
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210 | } |
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211 | |
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212 | static void am335x_i2c_continue_write( |
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213 | bbb_i2c_bus *bus, |
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214 | volatile bbb_i2c_regs *regs |
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215 | ) |
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216 | { |
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217 | if ( bus->already_transferred == bus->msg_todo ) { |
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218 | REG( ®s->BBB_I2C_DATA ) = |
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219 | bus->current_msg_byte[ bus->already_transferred ]; |
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220 | REG( ®s->BBB_I2C_IRQSTATUS ) = AM335X_I2C_IRQSTATUS_XRDY; |
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221 | am335x_i2c_masterint_disable( regs, AM335X_I2C_IRQSTATUS_XRDY ); |
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222 | REG( ®s->BBB_I2C_CON ) |= AM335X_I2C_CON_STOP; |
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223 | } else { |
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224 | writeb( bus->current_msg_byte[ bus->already_transferred ], |
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225 | ®s->BBB_I2C_DATA ); |
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226 | REG( ®s->BBB_I2C_IRQSTATUS ) = AM335X_I2C_IRQSTATUS_XRDY; |
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227 | bus->already_transferred++; |
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228 | } |
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229 | } |
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230 | |
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231 | static void am335x_i2c_setup_write_transfer( |
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232 | bbb_i2c_bus *bus, |
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233 | volatile bbb_i2c_regs *regs, |
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234 | const i2c_msg *msgs |
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235 | ) |
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236 | { |
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237 | volatile unsigned int no_bytes; |
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238 | |
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239 | REG( ®s->BBB_I2C_CNT ) = bus->current_msg_todo; |
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240 | no_bytes = REG( ®s->BBB_I2C_CNT ); |
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241 | (void) no_bytes; /* indicate we know that no_bytes is not referenced again */ |
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242 | REG( ®s->BBB_I2C_SA ) = msgs->addr; |
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243 | REG( ®s->BBB_I2C_CON ) = AM335X_I2C_CFG_MST_TX | AM335X_I2C_CON_I2C_EN; |
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244 | am335x_clean_interrupts( regs ); |
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245 | am335x_i2c_masterint_enable( regs, AM335X_I2C_IRQSTATUS_XRDY ); |
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246 | REG( ®s->BBB_I2C_CON ) |= AM335X_I2C_CON_START | AM335X_I2C_CON_STOP; |
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247 | } |
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248 | |
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249 | static void am335x_i2c_setup_transfer( |
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250 | bbb_i2c_bus *bus, |
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251 | volatile bbb_i2c_regs *regs |
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252 | ) |
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253 | { |
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254 | const i2c_msg *msgs = bus->msgs; |
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255 | uint32_t msg_todo = bus->msg_todo; |
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256 | bool send_stop = false; |
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257 | uint32_t i; |
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258 | |
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259 | bus->current_todo = msgs[ 0 ].len; |
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260 | |
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261 | for ( i = 1; i < msg_todo && ( msgs[ i ].flags & I2C_M_NOSTART ) != 0; |
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262 | ++i ) { |
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263 | bus->current_todo += msgs[ i ].len; |
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264 | } |
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265 | |
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266 | regs = bus->regs; |
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267 | REG( &bus->regs->BBB_I2C_BUF ) |= AM335X_I2C_BUF_TXFIFO_CLR; |
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268 | REG( &bus->regs->BBB_I2C_BUF ) |= AM335X_I2C_BUF_RXFIFO_CLR; |
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269 | am335x_i2c_set_address_size( msgs, regs ); |
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270 | bus->read = ( msgs->flags & I2C_M_RD ) != 0; |
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271 | bus->already_transferred = ( bus->read == true ) ? 0 : 1; |
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272 | |
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273 | if ( bus->read ) { |
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274 | if ( bus->current_msg_todo == 1 ) { |
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275 | send_stop = true; |
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276 | } |
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277 | |
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278 | am335x_i2c_setup_read_transfer( bus, regs, msgs, send_stop ); |
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279 | } else { |
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280 | am335x_i2c_setup_write_transfer( bus, regs, msgs ); |
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281 | } |
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282 | } |
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283 | |
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284 | static void am335x_i2c_interrupt( void *arg ) |
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285 | { |
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286 | bbb_i2c_bus *bus = arg; |
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287 | volatile bbb_i2c_regs *regs = bus->regs; |
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288 | /* Get status of enabled interrupts */ |
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289 | uint32_t irqstatus = REG( ®s->BBB_I2C_IRQSTATUS ); |
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290 | bool done = false; |
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291 | |
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292 | /* |
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293 | * Clear all enabled interrupt except receive ready |
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294 | * and transmit ready interrupt in status register |
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295 | */ |
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296 | REG( ®s->BBB_I2C_IRQSTATUS ) = |
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297 | ( irqstatus & ~( AM335X_I2C_IRQSTATUS_RRDY | |
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298 | AM335X_I2C_IRQSTATUS_XRDY ) ); |
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299 | |
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300 | if ( irqstatus & AM335X_I2C_INT_RECV_READY ) { |
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301 | am335x_i2c_continue_read_transfer( bus, regs ); |
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302 | } |
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303 | |
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304 | if ( irqstatus & AM335X_I2C_IRQSTATUS_XRDY ) { |
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305 | am335x_i2c_continue_write( bus, regs ); |
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306 | } |
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307 | |
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308 | if ( irqstatus & AM335X_I2C_IRQSTATUS_NACK ) { |
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309 | done = true; |
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310 | am335x_i2c_masterint_disable( regs, AM335X_I2C_IRQSTATUS_NACK ); |
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311 | } |
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312 | |
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313 | if ( irqstatus & AM335X_I2C_IRQSTATUS_ARDY ) { |
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314 | done = true; |
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315 | REG( ®s->BBB_I2C_IRQSTATUS ) = BBB_I2C_STAT_ARDY; |
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316 | } |
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317 | |
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318 | if ( irqstatus & AM335X_I2C_IRQSTATUS_BF ) { |
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319 | REG( ®s->BBB_I2C_IRQSTATUS ) = AM335X_I2C_IRQSTATUS_BF; |
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320 | } |
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321 | |
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322 | if ( done ) { |
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323 | uint32_t err = irqstatus & BBB_I2C_IRQ_ERROR; |
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324 | am335x_i2c_next_byte( bus ); |
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325 | |
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326 | if ( bus->msg_todo == 0 ) { |
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327 | rtems_status_code sc; |
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328 | am335x_i2c_masterint_disable( regs, ( AM335X_I2C_IRQSTATUS_RRDY | |
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329 | AM335X_I2C_IRQSTATUS_XRDY | |
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330 | AM335X_I2C_IRQSTATUS_BF ) ); |
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331 | REG( ®s->BBB_I2C_IRQSTATUS ) = err; |
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332 | |
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333 | sc = rtems_event_transient_send( bus->task_id ); |
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334 | _Assert( sc == RTEMS_SUCCESSFUL ); |
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335 | (void) sc; |
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336 | } else { |
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337 | am335x_i2c_setup_transfer( bus, regs ); |
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338 | } |
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339 | } |
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340 | } |
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341 | |
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342 | static int am335x_i2c_transfer( |
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343 | i2c_bus *base, |
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344 | i2c_msg *msgs, |
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345 | uint32_t msg_count |
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346 | ) |
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347 | { |
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348 | rtems_status_code sc; |
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349 | bbb_i2c_bus *bus = (bbb_i2c_bus *) base; |
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350 | volatile bbb_i2c_regs *regs; |
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351 | uint32_t i; |
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352 | |
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353 | rtems_task_wake_after( 1 ); |
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354 | |
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355 | if ( msg_count < 1 ) { |
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356 | return 1; |
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357 | } |
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358 | |
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359 | for ( i = 0; i < msg_count; ++i ) { |
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360 | if ( ( msgs[ i ].flags & I2C_M_RECV_LEN ) != 0 ) { |
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361 | return -EINVAL; |
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362 | } |
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363 | } |
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364 | |
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365 | bus->msgs = &msgs[ 0 ]; |
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366 | bus->msg_todo = msg_count; |
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367 | bus->current_msg_todo = msgs[ 0 ].len; |
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368 | bus->current_msg_byte = msgs[ 0 ].buf; |
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369 | bus->task_id = rtems_task_self(); |
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370 | regs = bus->regs; |
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371 | am335x_i2c_setup_transfer( bus, regs ); |
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372 | REG( ®s->BBB_I2C_IRQENABLE_SET ) = BBB_I2C_IRQ_USED; |
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373 | |
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374 | sc = rtems_event_transient_receive( RTEMS_WAIT, bus->base.timeout ); |
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375 | |
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376 | if ( sc != RTEMS_SUCCESSFUL ) { |
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377 | am335x_i2c_reset( bus ); |
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378 | rtems_event_transient_clear(); |
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379 | |
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380 | return -ETIMEDOUT; |
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381 | } |
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382 | |
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383 | return 0; |
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384 | } |
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385 | |
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386 | static int am335x_i2c_set_clock( |
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387 | i2c_bus *base, |
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388 | unsigned long clock |
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389 | ) |
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390 | { |
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391 | bbb_i2c_bus *bus = (bbb_i2c_bus *) base; |
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392 | uint32_t prescaler, divider; |
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393 | |
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394 | prescaler = ( BBB_I2C_SYSCLK / BBB_I2C_INTERNAL_CLK ) - 1; |
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395 | REG( &bus->regs->BBB_I2C_PSC ) = prescaler; |
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396 | divider = BBB_I2C_INTERNAL_CLK / ( 2 * clock ); |
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397 | REG( &bus->regs->BBB_I2C_SCLL ) = ( divider - 7 ); |
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398 | REG( &bus->regs->BBB_I2C_SCLH ) = ( divider - 5 ); |
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399 | |
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400 | return 0; |
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401 | } |
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402 | |
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403 | static void am335x_i2c_destroy( i2c_bus *base ) |
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404 | { |
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405 | bbb_i2c_bus *bus = (bbb_i2c_bus *) base; |
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406 | rtems_status_code sc; |
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407 | |
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408 | sc = rtems_interrupt_handler_remove( bus->irq, am335x_i2c_interrupt, bus ); |
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409 | _Assert( sc == RTEMS_SUCCESSFUL ); |
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410 | (void) sc; |
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411 | i2c_bus_destroy_and_free( &bus->base ); |
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412 | } |
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413 | |
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414 | int am335x_i2c_bus_register( |
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415 | const char *bus_path, |
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416 | uintptr_t register_base, |
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417 | uint32_t input_clock, |
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418 | rtems_vector_number irq |
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419 | ) |
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420 | { |
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421 | bbb_i2c_bus *bus; |
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422 | rtems_status_code sc; |
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423 | int err; |
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424 | |
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425 | /* Check bus number is >0 & <MAX */ |
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426 | bus = (bbb_i2c_bus *) i2c_bus_alloc_and_init( sizeof( *bus ) ); |
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427 | |
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428 | if ( bus == NULL ) { |
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429 | return -1; |
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430 | } |
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431 | |
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432 | bus->regs = (volatile bbb_i2c_regs *) register_base; |
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433 | |
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434 | I2C0ModuleClkConfig(); |
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435 | am335x_i2c0_pinmux( bus ); |
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436 | am335x_i2c_reset( bus ); |
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437 | bus->input_clock = input_clock; |
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438 | err = am335x_i2c_set_clock( &bus->base, I2C_BUS_CLOCK_DEFAULT ); |
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439 | |
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440 | if ( err != 0 ) { |
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441 | ( *bus->base.destroy )( &bus->base ); |
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442 | rtems_set_errno_and_return_minus_one( -err ); |
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443 | } |
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444 | |
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445 | bus->irq = irq; |
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446 | REG( &bus->regs->BBB_I2C_IRQSTATUS ) = BBB_I2C_ALL_IRQ_FLAGS; |
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447 | |
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448 | sc = rtems_interrupt_handler_install( |
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449 | irq, |
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450 | "BBB_I2C", |
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451 | RTEMS_INTERRUPT_UNIQUE, |
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452 | (rtems_interrupt_handler) am335x_i2c_interrupt, |
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453 | bus |
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454 | ); |
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455 | |
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456 | if ( sc != RTEMS_SUCCESSFUL ) { |
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457 | ( *bus->base.destroy )( &bus->base ); |
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458 | rtems_set_errno_and_return_minus_one( EIO ); |
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459 | } |
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460 | |
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461 | bus->base.transfer = am335x_i2c_transfer; |
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462 | bus->base.set_clock = am335x_i2c_set_clock; |
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463 | bus->base.destroy = am335x_i2c_destroy; |
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464 | |
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465 | return i2c_bus_register( &bus->base, bus_path ); |
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466 | } |
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