1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /* |
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4 | * RTEMS support for MPC83xx |
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5 | * |
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6 | * This file contains the low level MPC83xx I2C driver parameters. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2007 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * Redistribution and use in source and binary forms, with or without |
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13 | * modification, are permitted provided that the following conditions |
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14 | * are met: |
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15 | * 1. Redistributions of source code must retain the above copyright |
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16 | * notice, this list of conditions and the following disclaimer. |
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17 | * 2. Redistributions in binary form must reproduce the above copyright |
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18 | * notice, this list of conditions and the following disclaimer in the |
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19 | * documentation and/or other materials provided with the distribution. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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22 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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31 | * POSSIBILITY OF SUCH DAMAGE. |
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32 | */ |
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33 | |
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34 | #include <mpc83xx/mpc83xx_i2cdrv.h> |
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35 | #include <libchip/i2c-2b-eeprom.h> |
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36 | #include <libchip/i2c-sc620.h> |
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37 | #include <bsp/irq.h> |
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38 | #include <bsp.h> |
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39 | |
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40 | static void i2c1_probe(mpc83xx_i2c_softc_t *self) |
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41 | { |
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42 | #if MPC83XX_CHIP_TYPE != 8309 |
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43 | if (((mpc83xx.clk.sccr >> (31-1)) & 0x03) > 0) { |
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44 | self->base_frq = |
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45 | (BSP_bus_frequency |
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46 | /((mpc83xx.clk.sccr >> (31-1)) & 0x03)); |
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47 | } |
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48 | #else /* MPC83XX_CHIP_TYPE != 8309 */ |
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49 | self->base_frq = BSP_bus_frequency; |
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50 | #endif /* MPC83XX_CHIP_TYPE != 8309 */ |
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51 | } |
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52 | |
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53 | #ifndef MPC83XX_BOARD_BR_UID |
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54 | static void i2c2_probe(mpc83xx_i2c_softc_t *self) |
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55 | { |
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56 | self->base_frq = BSP_bus_frequency; |
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57 | } |
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58 | #endif /* MPC83XX_BOARD_BR_UID */ |
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59 | |
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60 | static mpc83xx_i2c_desc_t mpc83xx_i2c_bus_tbl[] = { |
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61 | /* first channel */ |
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62 | { |
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63 | {/* public fields */ |
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64 | .ops = &mpc83xx_i2c_ops, |
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65 | .size = sizeof(mpc83xx_i2c_bus_tbl[0]), |
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66 | }, |
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67 | { /* our private fields */ |
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68 | .reg_ptr = &mpc83xx.i2c[0], |
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69 | .initialized = FALSE, |
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70 | .irq_number = BSP_IPIC_IRQ_I2C1, |
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71 | .base_frq = 0, /* will be set during probe */ |
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72 | .probe = i2c1_probe |
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73 | } |
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74 | } |
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75 | #ifndef MPC83XX_BOARD_BR_UID |
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76 | /* second channel */ |
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77 | , { |
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78 | { /* public fields */ |
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79 | .ops = &mpc83xx_i2c_ops, |
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80 | .size = sizeof(mpc83xx_i2c_bus_tbl[0]), |
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81 | }, |
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82 | { /* our private fields */ |
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83 | .reg_ptr = &mpc83xx.i2c[1], |
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84 | .initialized = FALSE, |
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85 | .irq_number = BSP_IPIC_IRQ_I2C2, |
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86 | .base_frq = 0, /* will be set during probe */ |
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87 | .probe = i2c2_probe |
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88 | } |
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89 | } |
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90 | #endif /* MPC83XX_BOARD_BR_UID */ |
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91 | }; |
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92 | |
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93 | /*=========================================================================*\ |
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94 | | Function: | |
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95 | \*-------------------------------------------------------------------------*/ |
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96 | rtems_status_code bsp_register_i2c |
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97 | ( |
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98 | /*-------------------------------------------------------------------------*\ |
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99 | | Purpose: | |
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100 | | register I2C busses and devices | |
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101 | +---------------------------------------------------------------------------+ |
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102 | | Input Parameters: | |
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103 | \*-------------------------------------------------------------------------*/ |
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104 | void /* <none> */ |
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105 | ) |
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106 | /*-------------------------------------------------------------------------*\ |
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107 | | Return Value: | |
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108 | | 0 or error code | |
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109 | \*=========================================================================*/ |
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110 | |
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111 | { |
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112 | char device_path[] = "/dev/i2c?"; |
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113 | size_t n = RTEMS_ARRAY_SIZE(mpc83xx_i2c_bus_tbl); |
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114 | size_t i; |
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115 | int i2c_busno[n]; |
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116 | |
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117 | /* |
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118 | * init I2C library (if not already done) |
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119 | */ |
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120 | rtems_libi2c_initialize (); |
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121 | |
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122 | /* |
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123 | * init I2C buses |
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124 | */ |
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125 | for (i = 0; i < n; ++i) { |
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126 | mpc83xx_i2c_desc_t *desc = &mpc83xx_i2c_bus_tbl[i]; |
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127 | |
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128 | (*desc->softc.probe)(&desc->softc); |
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129 | device_path[sizeof(device_path) - 2] = (char) ('1' + i); |
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130 | i2c_busno[i] = rtems_libi2c_register_bus(device_path, &desc->bus_desc); |
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131 | } |
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132 | |
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133 | #if defined(RTEMS_BSP_I2C_EEPROM_DEVICE_NAME) |
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134 | if (n > 0) { |
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135 | /* |
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136 | * register EEPROM to bus 1, Address 0x50 |
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137 | */ |
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138 | rtems_libi2c_register_drv(RTEMS_BSP_I2C_EEPROM_DEVICE_NAME, |
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139 | i2c_2b_eeprom_driver_descriptor, |
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140 | i2c_busno[0],0x50); |
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141 | } |
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142 | #elif defined(MPC83XX_BOARD_BR_UID) |
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143 | if (n > 0) { |
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144 | rtems_libi2c_register_drv( |
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145 | "sc620", |
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146 | &i2c_sc620_driver, |
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147 | i2c_busno[0], |
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148 | 0x70 |
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149 | ); |
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150 | } |
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151 | #else |
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152 | |
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153 | /* |
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154 | * We have no i2c configuration for this variant but need to mark |
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155 | * i2c_busno as used. |
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156 | */ |
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157 | (void) i2c_busno[0]; /* avoid set but not used warning */ |
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158 | #endif |
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159 | |
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160 | /* |
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161 | * FIXME: register RTC driver, when available |
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162 | */ |
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163 | |
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164 | return RTEMS_SUCCESSFUL; |
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165 | } |
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