1 | /*===============================================================*\ |
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2 | | Project: RTEMS support for MPC83xx | |
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3 | +-----------------------------------------------------------------+ |
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4 | | Copyright (c) 2007 | |
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5 | | Embedded Brains GmbH | |
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6 | | Obere Lagerstr. 30 | |
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7 | | D-82178 Puchheim | |
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8 | | Germany | |
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9 | | rtems@embedded-brains.de | |
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10 | +-----------------------------------------------------------------+ |
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11 | | The license and distribution terms for this file may be | |
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12 | | found in the file LICENSE in this distribution or at | |
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13 | | | |
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14 | | http://www.rtems.com/license/LICENSE. | |
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15 | | | |
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16 | +-----------------------------------------------------------------+ |
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17 | | this file contains the low level MPC83xx SPI driver parameters | |
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18 | | and board-specific functions | |
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19 | \*===============================================================*/ |
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20 | #include <mpc83xx/mpc83xx_spidrv.h> |
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21 | #include <bsp/irq.h> |
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22 | #include <bsp.h> |
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23 | #if defined(MPC8349EAMDS) |
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24 | #include <libchip/i2c-2b-eeprom.h> |
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25 | #include <libchip/spi-flash-m25p40.h> |
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26 | #endif |
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27 | |
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28 | /*=========================================================================*\ |
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29 | | Board-specific adaptation functions | |
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30 | \*=========================================================================*/ |
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31 | |
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32 | /*=========================================================================*\ |
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33 | | Function: | |
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34 | \*-------------------------------------------------------------------------*/ |
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35 | static rtems_status_code bsp_spi_sel_addr |
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36 | ( |
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37 | /*-------------------------------------------------------------------------*\ |
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38 | | Purpose: | |
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39 | | address a slave device on the bus | |
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40 | +---------------------------------------------------------------------------+ |
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41 | | Input Parameters: | |
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42 | \*-------------------------------------------------------------------------*/ |
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43 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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44 | uint32_t addr, /* address to send on bus */ |
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45 | int rw /* 0=write,1=read */ |
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46 | ) |
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47 | /*-------------------------------------------------------------------------*\ |
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48 | | Return Value: | |
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49 | | o = ok or error code | |
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50 | \*=========================================================================*/ |
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51 | { |
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52 | #if defined(MPC8349EAMDS) |
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53 | /* |
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54 | * check device address for valid range |
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55 | */ |
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56 | if (addr > 0) { |
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57 | return RTEMS_INVALID_NUMBER; |
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58 | } |
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59 | /* |
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60 | * select given device |
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61 | * GPIO1[0] is nSEL_SPI for M25P40 |
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62 | * set it to be active/low |
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63 | */ |
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64 | mpc83xx.gpio[0].gpdat &= ~(1 << (31- 0)); |
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65 | #endif |
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66 | #if defined(HSC_CM01) |
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67 | /* |
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68 | * check device address for valid range |
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69 | */ |
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70 | if (addr > 7) { |
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71 | return RTEMS_INVALID_NUMBER; |
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72 | } |
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73 | /* |
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74 | * select given device |
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75 | */ |
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76 | /* |
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77 | * GPIO1[24] is SPI_A0 |
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78 | * GPIO1[25] is SPI_A1 |
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79 | * GPIO1[26] is SPI_A2 |
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80 | * set pins to address |
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81 | */ |
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82 | mpc83xx.gpio[0].gpdat = |
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83 | (mpc83xx.gpio[0].gpdat & ~(0x7 << (31-26))) |
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84 | | (addr << (31-26)); |
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85 | /* |
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86 | * GPIO1[27] is high-active strobe |
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87 | */ |
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88 | mpc83xx.gpio[0].gpdat |= (1 << (31- 27)); |
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89 | #endif |
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90 | return RTEMS_SUCCESSFUL; |
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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 | static rtems_status_code bsp_spi_send_start_dummy |
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97 | ( |
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98 | /*-------------------------------------------------------------------------*\ |
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99 | | Purpose: | |
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100 | | dummy function, SPI has no start condition | |
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101 | +---------------------------------------------------------------------------+ |
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102 | | Input Parameters: | |
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103 | \*-------------------------------------------------------------------------*/ |
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104 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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105 | ) |
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106 | /*-------------------------------------------------------------------------*\ |
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107 | | Return Value: | |
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108 | | o = ok or error code | |
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109 | \*=========================================================================*/ |
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110 | { |
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111 | #if defined(MPC8349EAMDS) |
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112 | /* |
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113 | * GPIO1[0] is nSEL_SPI for M25P40 |
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114 | * set it to inactive/high |
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115 | */ |
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116 | mpc83xx.gpio[0].gpdat |= (1 << (31- 0)); |
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117 | #endif |
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118 | #if defined(HSC_CM01) |
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119 | /* |
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120 | * GPIO1[27] is high-active strobe |
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121 | * set it to inactive/ low |
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122 | */ |
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123 | mpc83xx.gpio[0].gpdat &= ~(0x1 << (31-27)); |
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124 | #endif |
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125 | return 0; |
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126 | } |
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127 | |
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128 | /*=========================================================================*\ |
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129 | | Function: | |
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130 | \*-------------------------------------------------------------------------*/ |
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131 | static rtems_status_code bsp_spi_send_stop |
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132 | ( |
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133 | /*-------------------------------------------------------------------------*\ |
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134 | | Purpose: | |
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135 | | deselect SPI | |
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136 | +---------------------------------------------------------------------------+ |
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137 | | Input Parameters: | |
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138 | \*-------------------------------------------------------------------------*/ |
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139 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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140 | ) |
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141 | /*-------------------------------------------------------------------------*\ |
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142 | | Return Value: | |
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143 | | o = ok or error code | |
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144 | \*=========================================================================*/ |
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145 | { |
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146 | #if defined(DEBUG) |
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147 | printk("bsp_spi_send_stop called... "); |
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148 | #endif |
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149 | #if defined(MPC8349EAMDS) |
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150 | /* |
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151 | * deselect given device |
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152 | * GPIO1[0] is nSEL_SPI for M25P40 |
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153 | * set it to be inactive/high |
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154 | */ |
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155 | mpc83xx.gpio[0].gpdat |= (1 << (31- 0)); |
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156 | #endif |
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157 | #if defined(HSC_CM01) |
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158 | /* |
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159 | * deselect device |
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160 | * GPIO1[27] is high-active strobe |
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161 | */ |
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162 | mpc83xx.gpio[0].gpdat &= ~(1 << (31- 27)); |
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163 | #endif |
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164 | #if defined(DEBUG) |
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165 | printk("... exit OK\r\n"); |
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166 | #endif |
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167 | return 0; |
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168 | } |
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169 | |
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170 | /*=========================================================================*\ |
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171 | | list of handlers | |
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172 | \*=========================================================================*/ |
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173 | |
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174 | rtems_libi2c_bus_ops_t bsp_spi_ops = { |
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175 | init: mpc83xx_spi_init, |
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176 | send_start: bsp_spi_send_start_dummy, |
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177 | send_stop: bsp_spi_send_stop, |
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178 | send_addr: bsp_spi_sel_addr, |
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179 | read_bytes: mpc83xx_spi_read_bytes, |
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180 | write_bytes: mpc83xx_spi_write_bytes, |
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181 | ioctl: mpc83xx_spi_ioctl |
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182 | }; |
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183 | |
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184 | static mpc83xx_spi_desc_t bsp_spi_bus_desc = { |
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185 | {/* public fields */ |
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186 | ops: &bsp_spi_ops, |
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187 | size: sizeof(bsp_spi_bus_desc), |
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188 | }, |
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189 | { /* our private fields */ |
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190 | reg_ptr: &mpc83xx.spi, |
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191 | initialized: FALSE, |
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192 | irq_number: BSP_IPIC_IRQ_SPI |
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193 | } |
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194 | }; |
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195 | |
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196 | /*=========================================================================*\ |
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197 | | initialization | |
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198 | \*=========================================================================*/ |
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199 | |
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200 | /*=========================================================================*\ |
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201 | | Function: | |
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202 | \*-------------------------------------------------------------------------*/ |
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203 | rtems_status_code bsp_register_spi |
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204 | ( |
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205 | /*-------------------------------------------------------------------------*\ |
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206 | | Purpose: | |
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207 | | register SPI bus and devices | |
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208 | +---------------------------------------------------------------------------+ |
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209 | | Input Parameters: | |
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210 | \*-------------------------------------------------------------------------*/ |
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211 | void /* <none> */ |
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212 | ) |
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213 | /*-------------------------------------------------------------------------*\ |
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214 | | Return Value: | |
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215 | | 0 or error code | |
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216 | \*=========================================================================*/ |
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217 | { |
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218 | int ret_code; |
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219 | int spi_busno; |
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220 | |
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221 | /* |
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222 | * init I2C library (if not already done) |
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223 | */ |
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224 | rtems_libi2c_initialize (); |
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225 | |
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226 | /* |
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227 | * init port pins used to address/select SPI devices |
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228 | */ |
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229 | #if defined(MPC8349EAMDS) |
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230 | /* |
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231 | * GPIO1[0] is nSEL_SPI for M25P40 |
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232 | * set it to be output, high |
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233 | */ |
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234 | mpc83xx.gpio[0].gpdat |= (1 << (31- 0)); |
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235 | mpc83xx.gpio[0].gpdir |= (1 << (31- 0)); |
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236 | mpc83xx.gpio[0].gpdr &= ~(1 << (31- 0)); |
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237 | #endif |
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238 | #if defined(HSC_CM01) |
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239 | /* |
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240 | * GPIO1[24] is SPI_A0 |
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241 | * GPIO1[25] is SPI_A1 |
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242 | * GPIO1[26] is SPI_A2 |
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243 | * GPIO1[27] is high-active strobe |
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244 | * set pins to be output, low |
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245 | */ |
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246 | mpc83xx.gpio[0].gpdat &= ~(0xf << (31-27)); |
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247 | mpc83xx.gpio[0].gpdir |= (0xf << (31-27)); |
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248 | mpc83xx.gpio[0].gpdr &= ~(0xf << (31-27)); |
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249 | #endif |
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250 | /* |
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251 | * register SPI bus |
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252 | */ |
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253 | ret_code = rtems_libi2c_register_bus("/dev/spi", |
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254 | &(bsp_spi_bus_desc.bus_desc)); |
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255 | if (ret_code < 0) { |
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256 | return -ret_code; |
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257 | } |
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258 | spi_busno = ret_code; |
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259 | /* |
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260 | * register M25P40 Flash, when available |
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261 | */ |
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262 | #if defined(MPC8349EAMDS) |
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263 | ret_code = rtems_libi2c_register_drv(RTEMS_BSP_SPI_FLASH_DEVICE_NAME, |
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264 | spi_flash_m25p40_rw_driver_descriptor, |
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265 | spi_busno,0x00); |
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266 | if (ret_code < 0) { |
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267 | return -ret_code; |
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268 | } |
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269 | #endif |
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270 | /* |
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271 | * FIXME: further drivers, when available |
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272 | */ |
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273 | return 0; |
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274 | } |
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