1 | /*===============================================================*\ |
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2 | | Project: RTEMS support for PGH360 | |
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3 | +-----------------------------------------------------------------+ |
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4 | | Copyright (c) 2008 | |
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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.org/license/LICENSE. | |
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15 | | | |
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16 | +-----------------------------------------------------------------+ |
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17 | | this file contains the M360 SPI driver | |
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18 | \*===============================================================*/ |
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19 | #include <stdlib.h> |
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20 | #include <bsp.h> |
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21 | #include <rtems/m68k/m68360.h> |
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22 | #include <rtems/m68k/m360_spi.h> |
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23 | #include <rtems/error.h> |
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24 | #include <rtems/bspIo.h> |
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25 | #include <errno.h> |
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26 | #include <rtems/libi2c.h> |
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27 | |
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28 | #undef DEBUG |
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29 | static m360_spi_softc_t *m360_spi_softc_ptr; |
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30 | /* |
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31 | * this is a dummy receive buffer for sequences, |
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32 | * where only send data are available |
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33 | */ |
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34 | uint8_t m360_spi_dummy_rxbuf[2]; |
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35 | /*=========================================================================*\ |
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36 | | Function: | |
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37 | \*-------------------------------------------------------------------------*/ |
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38 | static rtems_status_code m360_spi_baud_to_mode |
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39 | ( |
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40 | /*-------------------------------------------------------------------------*\ |
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41 | | Purpose: | |
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42 | | determine proper divider value | |
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43 | +---------------------------------------------------------------------------+ |
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44 | | Input Parameters: | |
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45 | \*-------------------------------------------------------------------------*/ |
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46 | uint32_t baudrate, /* desired baudrate */ |
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47 | uint32_t *spimode /* result value */ |
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48 | ) |
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49 | /*-------------------------------------------------------------------------*\ |
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50 | | Return Value: | |
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51 | | o = ok or error code | |
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52 | \*=========================================================================*/ |
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53 | { |
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54 | uint32_t divider; |
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55 | uint16_t tmpmode = 0; |
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56 | /* |
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57 | * determine clock divider and DIV16 bit |
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58 | */ |
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59 | divider = m360_clock_rate/baudrate; |
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60 | if (divider > 64) { |
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61 | tmpmode = M360_SPMODE_DIV16; |
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62 | divider /= 16; |
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63 | } |
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64 | if ((divider < 1) || |
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65 | (divider > 64)) { |
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66 | return RTEMS_INVALID_NUMBER; |
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67 | } |
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68 | else { |
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69 | tmpmode |= M360_SPMODE_PM(divider/4-1); |
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70 | } |
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71 | *spimode = tmpmode; |
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72 | return RTEMS_SUCCESSFUL; |
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73 | } |
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74 | |
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75 | /*=========================================================================*\ |
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76 | | Function: | |
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77 | \*-------------------------------------------------------------------------*/ |
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78 | static rtems_status_code m360_spi_char_mode |
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79 | ( |
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80 | /*-------------------------------------------------------------------------*\ |
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81 | | Purpose: | |
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82 | | determine proper value for character size | |
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83 | +---------------------------------------------------------------------------+ |
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84 | | Input Parameters: | |
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85 | \*-------------------------------------------------------------------------*/ |
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86 | m360_spi_softc_t *softc_ptr, /* handle */ |
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87 | uint32_t bits_per_char, /* bits per character */ |
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88 | bool lsb_first, /* TRUE: send LSB first */ |
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89 | uint16_t *spimode /* result value */ |
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90 | ) |
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91 | /*-------------------------------------------------------------------------*\ |
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92 | | Return Value: | |
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93 | | o = ok or error code | |
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94 | \*=========================================================================*/ |
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95 | { |
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96 | uint16_t tmpmode; |
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97 | |
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98 | /* |
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99 | * calculate data format |
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100 | */ |
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101 | if ((bits_per_char >= 4) && |
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102 | (bits_per_char <= 16)) { |
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103 | tmpmode = M360_SPMODE_CLEN( bits_per_char-1); |
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104 | } |
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105 | else { |
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106 | return RTEMS_INVALID_NUMBER; |
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107 | } |
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108 | |
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109 | *spimode = tmpmode; |
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110 | return 0; |
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111 | } |
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112 | |
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113 | /*=========================================================================*\ |
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114 | | Function: | |
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115 | \*-------------------------------------------------------------------------*/ |
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116 | static int m360_spi_wait |
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117 | ( |
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118 | /*-------------------------------------------------------------------------*\ |
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119 | | Purpose: | |
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120 | | wait for spi to become idle | |
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121 | +---------------------------------------------------------------------------+ |
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122 | | Input Parameters: | |
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123 | \*-------------------------------------------------------------------------*/ |
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124 | m360_spi_softc_t *softc_ptr /* handle */ |
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125 | ) |
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126 | /*-------------------------------------------------------------------------*\ |
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127 | | Return Value: | |
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128 | | o = ok or error code | |
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129 | \*=========================================================================*/ |
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130 | { |
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131 | uint16_t act_status; |
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132 | rtems_status_code rc; |
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133 | uint32_t tout; |
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134 | |
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135 | #if defined(DEBUG) |
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136 | printk("m360_spi_wait called... "); |
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137 | #endif |
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138 | if (softc_ptr->initialized) { |
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139 | /* |
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140 | * allow interrupts, when receiver is not empty |
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141 | */ |
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142 | m360.spim = (M360_SPIE_TXE | M360_SPIE_TXB | |
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143 | M360_SPIE_BSY | M360_SPIE_MME); |
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144 | |
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145 | rc = rtems_semaphore_obtain(softc_ptr->irq_sema_id, |
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146 | RTEMS_WAIT, |
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147 | RTEMS_NO_TIMEOUT); |
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148 | if (rc != RTEMS_SUCCESSFUL) { |
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149 | return rc; |
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150 | } |
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151 | } |
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152 | else { |
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153 | tout = 0; |
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154 | do { |
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155 | if (tout++ > 1000000) { |
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156 | #if defined(DEBUG) |
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157 | printk("... exit with RTEMS_TIMEOUT\r\n"); |
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158 | #endif |
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159 | return RTEMS_TIMEOUT; |
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160 | } |
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161 | /* |
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162 | * wait for SPI to terminate |
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163 | */ |
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164 | } while (!(m360.spie & M360_SPIE_TXB)); |
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165 | } |
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166 | |
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167 | act_status = m360.spie; |
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168 | if ((act_status & (M360_SPIE_TXE | M360_SPIE_TXB | |
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169 | M360_SPIE_BSY | M360_SPIE_MME))!= M360_SPIE_TXB) { |
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170 | #if defined(DEBUG) |
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171 | printk("... exit with RTEMS_IO_ERROR," |
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172 | "act_status=0x%04x,mask=0x%04x,desired_status=0x%04x\r\n", |
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173 | act_status,status_mask,desired_status); |
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174 | #endif |
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175 | return RTEMS_IO_ERROR; |
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176 | } |
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177 | #if defined(DEBUG) |
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178 | printk("... exit OK\r\n"); |
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179 | #endif |
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180 | return RTEMS_SUCCESSFUL; |
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181 | } |
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182 | |
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183 | /*=========================================================================*\ |
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184 | | Function: | |
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185 | \*-------------------------------------------------------------------------*/ |
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186 | static rtems_isr m360_spi_irq_handler |
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187 | ( |
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188 | /*-------------------------------------------------------------------------*\ |
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189 | | Purpose: | |
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190 | | handle interrupts | |
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191 | +---------------------------------------------------------------------------+ |
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192 | | Input Parameters: | |
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193 | \*-------------------------------------------------------------------------*/ |
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194 | rtems_vector_number v /* vector number */ |
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195 | ) |
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196 | /*-------------------------------------------------------------------------*\ |
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197 | | Return Value: | |
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198 | | <none> | |
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199 | \*=========================================================================*/ |
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200 | { |
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201 | m360_spi_softc_t *softc_ptr = m360_spi_softc_ptr; |
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202 | |
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203 | /* |
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204 | * disable interrupt mask |
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205 | */ |
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206 | m360.spim = 0; |
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207 | if (softc_ptr->initialized) { |
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208 | rtems_semaphore_release(softc_ptr->irq_sema_id); |
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209 | } |
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210 | } |
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211 | |
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212 | /*=========================================================================*\ |
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213 | | Function: | |
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214 | \*-------------------------------------------------------------------------*/ |
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215 | static void m360_spi_install_irq_handler |
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216 | ( |
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217 | /*-------------------------------------------------------------------------*\ |
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218 | | Purpose: | |
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219 | | (un-)install the interrupt handler | |
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220 | +---------------------------------------------------------------------------+ |
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221 | | Input Parameters: | |
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222 | \*-------------------------------------------------------------------------*/ |
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223 | m360_spi_softc_t *softc_ptr, /* ptr to control structure */ |
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224 | int install /* TRUE: install, FALSE: remove */ |
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225 | ) |
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226 | /*-------------------------------------------------------------------------*\ |
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227 | | Return Value: | |
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228 | | <none> | |
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229 | \*=========================================================================*/ |
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230 | { |
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231 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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232 | |
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233 | /* |
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234 | * (un-)install handler for SPI device |
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235 | */ |
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236 | if (install) { |
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237 | /* |
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238 | * create semaphore for IRQ synchronization |
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239 | */ |
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240 | rc = rtems_semaphore_create(rtems_build_name('s','p','i','s'), |
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241 | 0, |
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242 | RTEMS_FIFO |
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243 | | RTEMS_SIMPLE_BINARY_SEMAPHORE, |
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244 | 0, |
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245 | &softc_ptr->irq_sema_id); |
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246 | if (rc != RTEMS_SUCCESSFUL) { |
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247 | rtems_panic("SPI: cannot create semaphore"); |
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248 | } |
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249 | if (rc == RTEMS_SUCCESSFUL) { |
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250 | rc = rtems_interrupt_catch (m360_spi_irq_handler, |
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251 | (m360.cicr & 0xE0) | 0x05, |
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252 | &softc_ptr->old_handler); |
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253 | if (rc != RTEMS_SUCCESSFUL) { |
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254 | rtems_panic("SPI: cannot install IRQ handler"); |
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255 | } |
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256 | } |
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257 | /* |
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258 | * enable IRQ in CPIC |
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259 | */ |
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260 | if (rc == RTEMS_SUCCESSFUL) { |
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261 | m360.cimr |= (1 << 5); |
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262 | } |
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263 | } |
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264 | else { |
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265 | rtems_isr_entry old_handler; |
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266 | /* |
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267 | * disable IRQ in CPIC |
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268 | */ |
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269 | if (rc == RTEMS_SUCCESSFUL) { |
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270 | m360.cimr &= ~(1 << 5); |
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271 | } |
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272 | rc = rtems_interrupt_catch (softc_ptr->old_handler, |
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273 | (m360.cicr & 0xE0) | 0x05, |
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274 | &old_handler); |
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275 | if (rc != RTEMS_SUCCESSFUL) { |
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276 | rtems_panic("SPI: cannot uninstall IRQ handler"); |
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277 | } |
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278 | /* |
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279 | * delete sync semaphore |
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280 | */ |
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281 | if (softc_ptr->irq_sema_id != 0) { |
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282 | rc = rtems_semaphore_delete(softc_ptr->irq_sema_id); |
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283 | if (rc != RTEMS_SUCCESSFUL) { |
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284 | rtems_panic("SPI: cannot delete semaphore"); |
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285 | } |
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286 | } |
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287 | } |
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288 | } |
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289 | |
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290 | /*=========================================================================*\ |
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291 | | Function: | |
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292 | \*-------------------------------------------------------------------------*/ |
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293 | rtems_status_code m360_spi_init |
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294 | ( |
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295 | /*-------------------------------------------------------------------------*\ |
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296 | | Purpose: | |
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297 | | initialize the driver | |
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298 | +---------------------------------------------------------------------------+ |
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299 | | Input Parameters: | |
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300 | \*-------------------------------------------------------------------------*/ |
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301 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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302 | ) |
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303 | /*-------------------------------------------------------------------------*\ |
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304 | | Return Value: | |
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305 | | o = ok or error code | |
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306 | \*=========================================================================*/ |
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307 | { |
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308 | m360_spi_softc_t *softc_ptr = &(((m360_spi_desc_t *)(bh))->softc); |
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309 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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310 | |
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311 | #if defined(DEBUG) |
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312 | printk("m360_spi_init called... "); |
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313 | #endif |
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314 | /* |
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315 | * init HW registers: |
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316 | */ |
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317 | /* |
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318 | * FIXME: set default mode in SPMODE |
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319 | */ |
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320 | |
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321 | /* |
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322 | * allocate BDs (1x RX, 1x TX) |
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323 | */ |
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324 | if (rc == RTEMS_SUCCESSFUL) { |
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325 | softc_ptr->rx_bd = M360AllocateBufferDescriptors (1); |
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326 | softc_ptr->tx_bd = M360AllocateBufferDescriptors (1); |
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327 | if ((softc_ptr->rx_bd == NULL) || |
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328 | (softc_ptr->tx_bd == NULL)) { |
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329 | rc = RTEMS_NO_MEMORY; |
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330 | } |
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331 | } |
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332 | /* |
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333 | * set parameter RAM |
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334 | */ |
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335 | m360.spip.rbase = (char *)softc_ptr->rx_bd - (char *)&m360; |
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336 | m360.spip.tbase = (char *)softc_ptr->tx_bd - (char *)&m360; |
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337 | m360.spip.rfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE; |
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338 | m360.spip.tfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE; |
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339 | m360.spip.mrblr = 2; |
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340 | |
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341 | /* |
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342 | * issue "InitRxTx" Command to CP |
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343 | */ |
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344 | M360ExecuteRISC (M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SPI); |
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345 | |
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346 | /* |
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347 | * init interrupt stuff |
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348 | */ |
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349 | if (rc == RTEMS_SUCCESSFUL) { |
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350 | m360_spi_install_irq_handler(softc_ptr,TRUE); |
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351 | } |
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352 | if (rc == RTEMS_SUCCESSFUL) { |
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353 | /* |
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354 | * set up ports |
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355 | * LINE PAR DIR DAT |
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356 | * ----------------------- |
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357 | * MOSI 1 1 x |
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358 | * MISO 1 1 x |
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359 | * CLK 1 1 x |
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360 | */ |
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361 | |
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362 | /* set Port B Pin Assignment Register... */ |
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363 | m360.pbpar = |
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364 | m360.pbpar |
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365 | | M360_PB_SPI_MISO_MSK |
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366 | | M360_PB_SPI_MOSI_MSK |
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367 | | M360_PB_SPI_CLK_MSK; |
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368 | |
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369 | /* set Port B Data Direction Register... */ |
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370 | m360.pbdir = |
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371 | m360.pbdir |
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372 | | M360_PB_SPI_MISO_MSK |
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373 | | M360_PB_SPI_MOSI_MSK |
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374 | | M360_PB_SPI_CLK_MSK; |
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375 | } |
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376 | /* |
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377 | * mark, that we have initialized |
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378 | */ |
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379 | if (rc == RTEMS_SUCCESSFUL) { |
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380 | softc_ptr->initialized = TRUE; |
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381 | } |
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382 | #if defined(DEBUG) |
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383 | printk("... exit OK\r\n"); |
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384 | #endif |
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385 | return rc; |
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386 | } |
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387 | |
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388 | |
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389 | /*=========================================================================*\ |
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390 | | Function: | |
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391 | \*-------------------------------------------------------------------------*/ |
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392 | static int m360_spi_read_write_bytes |
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393 | ( |
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394 | /*-------------------------------------------------------------------------*\ |
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395 | | Purpose: | |
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396 | | transmit/receive some bytes from SPI device | |
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397 | +---------------------------------------------------------------------------+ |
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398 | | Input Parameters: | |
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399 | \*-------------------------------------------------------------------------*/ |
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400 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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401 | unsigned char *rbuf, /* buffer to store bytes */ |
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402 | const unsigned char *tbuf, /* buffer to send bytes */ |
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403 | int len /* number of bytes to transceive */ |
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404 | ) |
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405 | /*-------------------------------------------------------------------------*\ |
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406 | | Return Value: | |
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407 | | number of bytes received or (negative) error code | |
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408 | \*=========================================================================*/ |
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409 | { |
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410 | m360_spi_softc_t *softc_ptr = &(((m360_spi_desc_t *)(bh))->softc); |
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411 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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412 | int bc = 0; |
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413 | |
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414 | #if defined(DEBUG) |
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415 | printk("m360_spi_read_write_bytes called... "); |
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416 | #endif |
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417 | |
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418 | /* |
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419 | * prepare RxBD |
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420 | */ |
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421 | if (rc == RTEMS_SUCCESSFUL) { |
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422 | if (rbuf == NULL) { |
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423 | /* |
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424 | * no Tx buffer: receive to dummy buffer |
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425 | */ |
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426 | m360.spip.mrblr = sizeof(m360_spi_dummy_rxbuf); |
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427 | softc_ptr->rx_bd->buffer = m360_spi_dummy_rxbuf; |
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428 | softc_ptr->rx_bd->length = 0; |
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429 | softc_ptr->rx_bd->status = (M360_BD_EMPTY | M360_BD_WRAP | |
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430 | M360_BD_CONTINUOUS); |
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431 | } |
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432 | else { |
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433 | m360.spip.mrblr = len; |
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434 | softc_ptr->rx_bd->buffer = rbuf; |
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435 | softc_ptr->rx_bd->length = 0; |
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436 | softc_ptr->rx_bd->status = (M360_BD_EMPTY | M360_BD_WRAP); |
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437 | } |
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438 | } |
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439 | /* |
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440 | * prepare TxBD |
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441 | */ |
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442 | if (rc == RTEMS_SUCCESSFUL) { |
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443 | if (tbuf == NULL) { |
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444 | /* |
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445 | * FIXME: no Tx buffer: transmit from dummy buffer |
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446 | */ |
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447 | softc_ptr->tx_bd->buffer = m360_spi_dummy_rxbuf; |
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448 | softc_ptr->tx_bd->length = len; |
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449 | softc_ptr->tx_bd->status = (M360_BD_READY | M360_BD_WRAP | |
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450 | M360_BD_CONTINUOUS); |
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451 | } |
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452 | else { |
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453 | softc_ptr->tx_bd->buffer = tbuf; |
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454 | softc_ptr->tx_bd->length = len; |
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455 | softc_ptr->tx_bd->status = (M360_BD_READY | M360_BD_WRAP); |
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456 | } |
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457 | } |
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458 | |
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459 | if (rc == RTEMS_SUCCESSFUL) { |
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460 | /* |
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461 | * set START command |
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462 | */ |
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463 | m360.spcom = M360_SPCOM_STR; |
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464 | /* |
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465 | * wait for SPI to finish |
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466 | */ |
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467 | rc = m360_spi_wait(softc_ptr); |
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468 | } |
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469 | #if defined(DEBUG) |
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470 | printk("... exit OK, rc=%d\r\n",bc); |
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471 | #endif |
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472 | return (rc == RTEMS_SUCCESSFUL) ? bc : -rc; |
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473 | } |
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474 | |
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475 | /*=========================================================================*\ |
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476 | | Function: | |
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477 | \*-------------------------------------------------------------------------*/ |
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478 | int m360_spi_read_bytes |
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479 | ( |
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480 | /*-------------------------------------------------------------------------*\ |
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481 | | Purpose: | |
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482 | | receive some bytes from SPI device | |
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483 | +---------------------------------------------------------------------------+ |
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484 | | Input Parameters: | |
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485 | \*-------------------------------------------------------------------------*/ |
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486 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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487 | unsigned char *buf, /* buffer to store bytes */ |
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488 | int len /* number of bytes to receive */ |
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489 | ) |
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490 | /*-------------------------------------------------------------------------*\ |
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491 | | Return Value: | |
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492 | | number of bytes received or (negative) error code | |
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493 | \*=========================================================================*/ |
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494 | { |
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495 | return m360_spi_read_write_bytes(bh,buf,NULL,len); |
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496 | } |
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497 | |
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498 | /*=========================================================================*\ |
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499 | | Function: | |
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500 | \*-------------------------------------------------------------------------*/ |
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501 | int m360_spi_write_bytes |
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502 | ( |
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503 | /*-------------------------------------------------------------------------*\ |
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504 | | Purpose: | |
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505 | | send some bytes to SPI device | |
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506 | +---------------------------------------------------------------------------+ |
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507 | | Input Parameters: | |
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508 | \*-------------------------------------------------------------------------*/ |
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509 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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510 | unsigned char *buf, /* buffer to send */ |
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511 | int len /* number of bytes to send */ |
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512 | |
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513 | ) |
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514 | /*-------------------------------------------------------------------------*\ |
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515 | | Return Value: | |
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516 | | number of bytes sent or (negative) error code | |
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517 | \*=========================================================================*/ |
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518 | { |
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519 | return m360_spi_read_write_bytes(bh,NULL,buf,len); |
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520 | } |
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521 | |
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522 | /*=========================================================================*\ |
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523 | | Function: | |
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524 | \*-------------------------------------------------------------------------*/ |
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525 | rtems_status_code m360_spi_set_tfr_mode |
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526 | ( |
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527 | /*-------------------------------------------------------------------------*\ |
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528 | | Purpose: | |
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529 | | set SPI to desired baudrate/clock mode/character mode | |
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530 | +---------------------------------------------------------------------------+ |
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531 | | Input Parameters: | |
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532 | \*-------------------------------------------------------------------------*/ |
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533 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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534 | const rtems_libi2c_tfr_mode_t *tfr_mode /* transfer mode info */ |
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535 | ) |
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536 | /*-------------------------------------------------------------------------*\ |
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537 | | Return Value: | |
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538 | | rtems_status_code | |
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539 | \*=========================================================================*/ |
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540 | { |
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541 | m360_spi_softc_t *softc_ptr = &(((m360_spi_desc_t *)(bh))->softc); |
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542 | uint32_t spimode_baud,spimode; |
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543 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
---|
544 | /* |
---|
545 | * FIXME: set proper mode |
---|
546 | */ |
---|
547 | if (rc == RTEMS_SUCCESSFUL) { |
---|
548 | rc = m360_spi_baud_to_mode(tfr_mode->baudrate,&spimode_baud); |
---|
549 | } |
---|
550 | if (rc == RTEMS_SUCCESSFUL) { |
---|
551 | rc = m360_spi_char_mode(softc_ptr, |
---|
552 | tfr_mode->bits_per_char, |
---|
553 | tfr_mode->lsb_first, |
---|
554 | &spimode); |
---|
555 | } |
---|
556 | if (rc == RTEMS_SUCCESSFUL) { |
---|
557 | spimode |= spimode_baud; |
---|
558 | spimode |= M360_SPMODE_MASTER; /* set master mode */ |
---|
559 | if (!tfr_mode->lsb_first) { |
---|
560 | spimode |= M360_SPMODE_REV; |
---|
561 | } |
---|
562 | if (tfr_mode->clock_inv) { |
---|
563 | spimode |= M360_SPMODE_CI; |
---|
564 | } |
---|
565 | if (tfr_mode->clock_phs) { |
---|
566 | spimode |= M360_SPMODE_CP; |
---|
567 | } |
---|
568 | } |
---|
569 | |
---|
570 | if (rc == RTEMS_SUCCESSFUL) { |
---|
571 | /* |
---|
572 | * disable SPI |
---|
573 | */ |
---|
574 | m360.spmode &= ~M360_SPMODE_EN; |
---|
575 | /* |
---|
576 | * set new mode and reenable SPI |
---|
577 | */ |
---|
578 | m360.spmode = spimode | M360_SPMODE_EN; |
---|
579 | } |
---|
580 | return rc; |
---|
581 | } |
---|
582 | |
---|
583 | |
---|
584 | /*=========================================================================*\ |
---|
585 | | Function: | |
---|
586 | \*-------------------------------------------------------------------------*/ |
---|
587 | int m360_spi_ioctl |
---|
588 | ( |
---|
589 | /*-------------------------------------------------------------------------*\ |
---|
590 | | Purpose: | |
---|
591 | | perform selected ioctl function for SPI | |
---|
592 | +---------------------------------------------------------------------------+ |
---|
593 | | Input Parameters: | |
---|
594 | \*-------------------------------------------------------------------------*/ |
---|
595 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
---|
596 | int cmd, /* ioctl command code */ |
---|
597 | void *arg /* additional argument array */ |
---|
598 | ) |
---|
599 | /*-------------------------------------------------------------------------*\ |
---|
600 | | Return Value: | |
---|
601 | | rtems_status_code | |
---|
602 | \*=========================================================================*/ |
---|
603 | { |
---|
604 | int ret_val = -1; |
---|
605 | |
---|
606 | switch(cmd) { |
---|
607 | case RTEMS_LIBI2C_IOCTL_SET_TFRMODE: |
---|
608 | ret_val = |
---|
609 | -m360_spi_set_tfr_mode(bh, |
---|
610 | (const rtems_libi2c_tfr_mode_t *)arg); |
---|
611 | break; |
---|
612 | case RTEMS_LIBI2C_IOCTL_READ_WRITE: |
---|
613 | ret_val = |
---|
614 | m360_spi_read_write_bytes(bh, |
---|
615 | ((rtems_libi2c_read_write_t *)arg)->rd_buf, |
---|
616 | ((rtems_libi2c_read_write_t *)arg)->wr_buf, |
---|
617 | ((rtems_libi2c_read_write_t *)arg)->byte_cnt); |
---|
618 | break; |
---|
619 | default: |
---|
620 | ret_val = -RTEMS_NOT_DEFINED; |
---|
621 | break; |
---|
622 | } |
---|
623 | return ret_val; |
---|
624 | } |
---|
625 | |
---|
626 | /*=========================================================================*\ |
---|
627 | | Board-specific adaptation functions | |
---|
628 | \*=========================================================================*/ |
---|
629 | |
---|
630 | /*=========================================================================*\ |
---|
631 | | Function: | |
---|
632 | \*-------------------------------------------------------------------------*/ |
---|
633 | static rtems_status_code bsp_spi_sel_addr |
---|
634 | ( |
---|
635 | /*-------------------------------------------------------------------------*\ |
---|
636 | | Purpose: | |
---|
637 | | address a slave device on the bus | |
---|
638 | +---------------------------------------------------------------------------+ |
---|
639 | | Input Parameters: | |
---|
640 | \*-------------------------------------------------------------------------*/ |
---|
641 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
---|
642 | uint32_t addr, /* address to send on bus */ |
---|
643 | int rw /* 0=write,1=read */ |
---|
644 | ) |
---|
645 | /*-------------------------------------------------------------------------*\ |
---|
646 | | Return Value: | |
---|
647 | | o = ok or error code | |
---|
648 | \*=========================================================================*/ |
---|
649 | { |
---|
650 | #if defined(PGH360) |
---|
651 | /* |
---|
652 | * select given device |
---|
653 | */ |
---|
654 | /* |
---|
655 | * GPIO1[24] is SPI_A0 |
---|
656 | * GPIO1[25] is SPI_A1 |
---|
657 | * GPIO1[26] is SPI_A2 |
---|
658 | * set pins to address |
---|
659 | */ |
---|
660 | switch(addr) { |
---|
661 | case PGH360_SPI_ADDR_EEPROM: |
---|
662 | m360.pbdat &= ~PGH360_PB_SPI_EEP_CE_MSK; |
---|
663 | break; |
---|
664 | case PGH360_SPI_ADDR_DISP4_DATA: |
---|
665 | m360.pbdat = (m360.pbdat |
---|
666 | & ~(PGH360_PB_SPI_DISP4_CE_MSK | |
---|
667 | PGH360_PB_SPI_DISP4_RS_MSK)); |
---|
668 | break; |
---|
669 | case PGH360_SPI_ADDR_DISP4_CTRL: |
---|
670 | m360.pbdat = (m360.pbdat |
---|
671 | & ~(PGH360_PB_SPI_DISP4_CE_MSK) |
---|
672 | | PGH360_PB_SPI_DISP4_RS_MSK); |
---|
673 | break; |
---|
674 | default: |
---|
675 | return RTEMS_INVALID_NUMBER; |
---|
676 | } |
---|
677 | #endif /* PGH360 */ |
---|
678 | return RTEMS_SUCCESSFUL; |
---|
679 | } |
---|
680 | |
---|
681 | /*=========================================================================*\ |
---|
682 | | Function: | |
---|
683 | \*-------------------------------------------------------------------------*/ |
---|
684 | static rtems_status_code bsp_spi_send_start_dummy |
---|
685 | ( |
---|
686 | /*-------------------------------------------------------------------------*\ |
---|
687 | | Purpose: | |
---|
688 | | dummy function, SPI has no start condition | |
---|
689 | +---------------------------------------------------------------------------+ |
---|
690 | | Input Parameters: | |
---|
691 | \*-------------------------------------------------------------------------*/ |
---|
692 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
---|
693 | ) |
---|
694 | /*-------------------------------------------------------------------------*\ |
---|
695 | | Return Value: | |
---|
696 | | o = ok or error code | |
---|
697 | \*=========================================================================*/ |
---|
698 | { |
---|
699 | return 0; |
---|
700 | } |
---|
701 | |
---|
702 | /*=========================================================================*\ |
---|
703 | | Function: | |
---|
704 | \*-------------------------------------------------------------------------*/ |
---|
705 | static rtems_status_code bsp_spi_send_stop |
---|
706 | ( |
---|
707 | /*-------------------------------------------------------------------------*\ |
---|
708 | | Purpose: | |
---|
709 | | deselect SPI | |
---|
710 | +---------------------------------------------------------------------------+ |
---|
711 | | Input Parameters: | |
---|
712 | \*-------------------------------------------------------------------------*/ |
---|
713 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
---|
714 | ) |
---|
715 | /*-------------------------------------------------------------------------*\ |
---|
716 | | Return Value: | |
---|
717 | | o = ok or error code | |
---|
718 | \*=========================================================================*/ |
---|
719 | { |
---|
720 | #if defined(DEBUG) |
---|
721 | printk("bsp_spi_send_stop called... "); |
---|
722 | #endif |
---|
723 | #if defined(PGH360) |
---|
724 | m360.pbdat = (m360.pbdat |
---|
725 | | PGH360_PB_SPI_DISP4_CE_MSK |
---|
726 | | PGH360_PB_SPI_EEP_CE_MSK); |
---|
727 | #endif |
---|
728 | #if defined(DEBUG) |
---|
729 | printk("... exit OK\r\n"); |
---|
730 | #endif |
---|
731 | return 0; |
---|
732 | } |
---|
733 | |
---|
734 | /*=========================================================================*\ |
---|
735 | | list of handlers | |
---|
736 | \*=========================================================================*/ |
---|
737 | |
---|
738 | rtems_libi2c_bus_ops_t bsp_spi_ops = { |
---|
739 | init: m360_spi_init, |
---|
740 | send_start: bsp_spi_send_start_dummy, |
---|
741 | send_stop: bsp_spi_send_stop, |
---|
742 | send_addr: bsp_spi_sel_addr, |
---|
743 | read_bytes: m360_spi_read_bytes, |
---|
744 | write_bytes: m360_spi_write_bytes, |
---|
745 | ioctl: m360_spi_ioctl |
---|
746 | }; |
---|
747 | |
---|
748 | static m360_spi_desc_t bsp_spi_bus_desc = { |
---|
749 | {/* public fields */ |
---|
750 | ops: &bsp_spi_ops, |
---|
751 | size: sizeof(bsp_spi_bus_desc) |
---|
752 | }, |
---|
753 | { /* our private fields */ |
---|
754 | initialized: FALSE |
---|
755 | } |
---|
756 | }; |
---|
757 | |
---|
758 | /*=========================================================================*\ |
---|
759 | | initialization | |
---|
760 | \*=========================================================================*/ |
---|
761 | |
---|
762 | /*=========================================================================*\ |
---|
763 | | Function: | |
---|
764 | \*-------------------------------------------------------------------------*/ |
---|
765 | rtems_status_code bsp_register_spi |
---|
766 | ( |
---|
767 | /*-------------------------------------------------------------------------*\ |
---|
768 | | Purpose: | |
---|
769 | | register SPI bus and devices | |
---|
770 | +---------------------------------------------------------------------------+ |
---|
771 | | Input Parameters: | |
---|
772 | \*-------------------------------------------------------------------------*/ |
---|
773 | void /* <none> */ |
---|
774 | ) |
---|
775 | /*-------------------------------------------------------------------------*\ |
---|
776 | | Return Value: | |
---|
777 | | 0 or error code | |
---|
778 | \*=========================================================================*/ |
---|
779 | { |
---|
780 | int ret_code; |
---|
781 | int spi_busno; |
---|
782 | |
---|
783 | /* |
---|
784 | * init I2C library (if not already done) |
---|
785 | */ |
---|
786 | rtems_libi2c_initialize (); |
---|
787 | |
---|
788 | /* |
---|
789 | * init port pins used to address/select SPI devices |
---|
790 | */ |
---|
791 | |
---|
792 | #if defined(PGH360) |
---|
793 | |
---|
794 | /* |
---|
795 | * set up ports |
---|
796 | * LINE PAR DIR DAT |
---|
797 | * ----------------------- |
---|
798 | * EEP_CE 0 1 act-high |
---|
799 | * DISP4_CS 0 1 act-high |
---|
800 | * DISP4_RS 0 1 active |
---|
801 | */ |
---|
802 | |
---|
803 | /* set Port B Pin Assignment Register... */ |
---|
804 | m360.pbpar = |
---|
805 | (m360.pbpar |
---|
806 | & ~(PGH360_PB_SPI_EEP_CE_MSK |
---|
807 | | PGH360_PB_SPI_DISP4_CE_MSK |
---|
808 | | PGH360_PB_SPI_DISP4_RS_MSK)); |
---|
809 | |
---|
810 | /* set Port B Data Direction Register... */ |
---|
811 | m360.pbdir = |
---|
812 | m360.pbdir |
---|
813 | | PGH360_PB_SPI_EEP_CE_MSK |
---|
814 | | PGH360_PB_SPI_DISP4_CE_MSK |
---|
815 | | PGH360_PB_SPI_DISP4_RS_MSK; |
---|
816 | |
---|
817 | /* set Port B Data Register to inactive CE state */ |
---|
818 | m360.pbdat = |
---|
819 | m360.pbdat |
---|
820 | | PGH360_PB_SPI_DISP4_CE_MSK |
---|
821 | | PGH360_PB_SPI_DISP4_RS_MSK; |
---|
822 | #endif |
---|
823 | |
---|
824 | /* |
---|
825 | * register SPI bus |
---|
826 | */ |
---|
827 | ret_code = rtems_libi2c_register_bus("/dev/spi", |
---|
828 | &(bsp_spi_bus_desc.bus_desc)); |
---|
829 | if (ret_code < 0) { |
---|
830 | return -ret_code; |
---|
831 | } |
---|
832 | spi_busno = ret_code; |
---|
833 | #if defined(PGH360) |
---|
834 | /* |
---|
835 | * register devices |
---|
836 | */ |
---|
837 | #if 0 |
---|
838 | ret_code = rtems_libi2c_register_drv(RTEMS_BSP_SPI_FLASH_DEVICE_NAME, |
---|
839 | spi_flash_m25p40_rw_driver_descriptor, |
---|
840 | spi_busno,0x00); |
---|
841 | if (ret_code < 0) { |
---|
842 | return -ret_code; |
---|
843 | } |
---|
844 | #endif |
---|
845 | #endif /* defined(PGH360) */ |
---|
846 | /* |
---|
847 | * FIXME: further drivers, when available |
---|
848 | */ |
---|
849 | return 0; |
---|
850 | } |
---|
851 | |
---|
852 | |
---|