1 | /*===============================================================*\ |
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2 | | Project: RTEMS support for tqm8xx | |
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3 | +-----------------------------------------------------------------+ |
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4 | | Copyright (c) 2009 | |
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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 MPC8xx 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 <mpc8xx.h> |
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22 | #include <bsp/spi.h> |
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23 | #include <libchip/disp_hcms29xx.h> |
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24 | #include <rtems/error.h> |
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25 | #include <rtems/bspIo.h> |
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26 | #include <errno.h> |
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27 | #include <rtems/libi2c.h> |
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28 | #include <bsp/irq.h> |
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29 | |
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30 | #define M8xx_PB_SPI_MISO_MSK (1<<(31-28)) |
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31 | #define M8xx_PB_SPI_MOSI_MSK (1<<(31-29)) |
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32 | #define M8xx_PB_SPI_CLK_MSK (1<<(31-30)) |
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33 | |
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34 | #undef DEBUG |
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35 | |
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36 | /* |
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37 | * this is a dummy receive buffer for sequences, |
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38 | * where only send data are available |
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39 | */ |
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40 | uint8_t m8xx_spi_dummy_rxbuf[2]; |
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41 | /*=========================================================================*\ |
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42 | | Function: | |
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43 | \*-------------------------------------------------------------------------*/ |
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44 | static rtems_status_code m8xx_spi_baud_to_mode |
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45 | ( |
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46 | /*-------------------------------------------------------------------------*\ |
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47 | | Purpose: | |
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48 | | determine proper divider value | |
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49 | +---------------------------------------------------------------------------+ |
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50 | | Input Parameters: | |
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51 | \*-------------------------------------------------------------------------*/ |
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52 | uint32_t baudrate, /* desired baudrate */ |
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53 | uint32_t *spimode /* result value */ |
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54 | ) |
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55 | /*-------------------------------------------------------------------------*\ |
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56 | | Return Value: | |
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57 | | o = ok or error code | |
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58 | \*=========================================================================*/ |
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59 | { |
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60 | uint32_t divider; |
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61 | uint16_t tmpmode = 0; |
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62 | /* |
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63 | * determine clock divider and DIV16 bit |
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64 | */ |
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65 | divider = BSP_bus_frequency/baudrate; |
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66 | if (divider > 64) { |
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67 | tmpmode = M8xx_SPMODE_DIV16; |
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68 | divider /= 16; |
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69 | } |
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70 | if ((divider < 1) || |
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71 | (divider > 64)) { |
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72 | return RTEMS_INVALID_NUMBER; |
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73 | } |
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74 | else { |
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75 | tmpmode |= M8xx_SPMODE_PM(divider/4-1); |
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76 | } |
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77 | *spimode = tmpmode; |
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78 | return RTEMS_SUCCESSFUL; |
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79 | } |
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80 | |
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81 | /*=========================================================================*\ |
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82 | | Function: | |
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83 | \*-------------------------------------------------------------------------*/ |
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84 | static rtems_status_code m8xx_spi_char_mode |
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85 | ( |
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86 | /*-------------------------------------------------------------------------*\ |
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87 | | Purpose: | |
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88 | | determine proper value for character size | |
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89 | +---------------------------------------------------------------------------+ |
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90 | | Input Parameters: | |
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91 | \*-------------------------------------------------------------------------*/ |
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92 | m8xx_spi_softc_t *softc_ptr, /* handle */ |
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93 | uint32_t bits_per_char, /* bits per character */ |
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94 | bool lsb_first, /* TRUE: send LSB first */ |
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95 | uint16_t *spimode /* result value */ |
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96 | ) |
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97 | /*-------------------------------------------------------------------------*\ |
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98 | | Return Value: | |
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99 | | o = ok or error code | |
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100 | \*=========================================================================*/ |
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101 | { |
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102 | uint16_t tmpmode; |
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103 | |
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104 | /* |
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105 | * calculate data format |
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106 | */ |
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107 | if ((bits_per_char >= 4) && |
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108 | (bits_per_char <= 16)) { |
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109 | tmpmode = M8xx_SPMODE_CLEN( bits_per_char-1); |
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110 | } |
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111 | else { |
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112 | return RTEMS_INVALID_NUMBER; |
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113 | } |
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114 | |
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115 | *spimode = tmpmode; |
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116 | return 0; |
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117 | } |
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118 | |
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119 | /*=========================================================================*\ |
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120 | | Function: | |
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121 | \*-------------------------------------------------------------------------*/ |
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122 | static int m8xx_spi_wait |
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123 | ( |
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124 | /*-------------------------------------------------------------------------*\ |
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125 | | Purpose: | |
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126 | | wait for spi to become idle | |
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127 | +---------------------------------------------------------------------------+ |
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128 | | Input Parameters: | |
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129 | \*-------------------------------------------------------------------------*/ |
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130 | m8xx_spi_softc_t *softc_ptr /* handle */ |
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131 | ) |
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132 | /*-------------------------------------------------------------------------*\ |
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133 | | Return Value: | |
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134 | | o = ok or error code | |
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135 | \*=========================================================================*/ |
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136 | { |
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137 | uint16_t act_status; |
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138 | rtems_status_code rc; |
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139 | uint32_t tout; |
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140 | |
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141 | #if defined(DEBUG) |
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142 | printk("m8xx_spi_wait called... "); |
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143 | #endif |
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144 | if (softc_ptr->initialized) { |
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145 | /* |
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146 | * allow interrupts, when receiver is not empty |
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147 | */ |
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148 | m8xx.spim = (M8xx_SPIE_TXE | M8xx_SPIE_TXB | |
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149 | M8xx_SPIE_BSY | M8xx_SPIE_MME); |
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150 | |
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151 | rc = rtems_semaphore_obtain(softc_ptr->irq_sema_id, |
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152 | RTEMS_WAIT, |
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153 | RTEMS_NO_TIMEOUT); |
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154 | if (rc != RTEMS_SUCCESSFUL) { |
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155 | return rc; |
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156 | } |
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157 | } |
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158 | else { |
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159 | tout = 0; |
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160 | do { |
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161 | if (tout++ > 1000000) { |
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162 | #if defined(DEBUG) |
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163 | printk("... exit with RTEMS_TIMEOUT\r\n"); |
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164 | #endif |
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165 | return RTEMS_TIMEOUT; |
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166 | } |
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167 | /* |
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168 | * wait for SPI to terminate |
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169 | */ |
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170 | } while (!(m8xx.spie & M8xx_SPIE_TXB)); |
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171 | } |
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172 | |
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173 | act_status = m8xx.spie; |
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174 | if ((act_status & (M8xx_SPIE_TXE | M8xx_SPIE_TXB | |
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175 | M8xx_SPIE_BSY | M8xx_SPIE_MME))!= M8xx_SPIE_TXB) { |
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176 | #if defined(DEBUG) |
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177 | printk("... exit with RTEMS_IO_ERROR," |
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178 | "act_status=0x%04x,mask=0x%04x,desired_status=0x%04x\r\n", |
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179 | act_status,status_mask,desired_status); |
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180 | #endif |
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181 | return RTEMS_IO_ERROR; |
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182 | } |
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183 | #if defined(DEBUG) |
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184 | printk("... exit OK\r\n"); |
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185 | #endif |
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186 | return RTEMS_SUCCESSFUL; |
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187 | } |
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188 | |
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189 | /*=========================================================================*\ |
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190 | | Function: | |
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191 | \*-------------------------------------------------------------------------*/ |
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192 | static rtems_isr m8xx_spi_irq_handler |
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193 | ( |
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194 | /*-------------------------------------------------------------------------*\ |
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195 | | Purpose: | |
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196 | | handle interrupts | |
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197 | +---------------------------------------------------------------------------+ |
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198 | | Input Parameters: | |
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199 | \*-------------------------------------------------------------------------*/ |
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200 | void *arg |
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201 | ) |
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202 | /*-------------------------------------------------------------------------*\ |
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203 | | Return Value: | |
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204 | | <none> | |
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205 | \*=========================================================================*/ |
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206 | { |
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207 | m8xx_spi_softc_t *softc_ptr = arg; |
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208 | |
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209 | /* |
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210 | * disable interrupt mask |
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211 | */ |
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212 | m8xx.spim = 0; |
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213 | if (softc_ptr->initialized) { |
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214 | rtems_semaphore_release(softc_ptr->irq_sema_id); |
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215 | } |
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216 | } |
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217 | |
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218 | static void |
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219 | mpc8xx_spi_irq_on(const rtems_irq_connect_data *irq) |
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220 | { |
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221 | } |
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222 | |
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223 | static void |
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224 | mpc8xx_spi_irq_off(const rtems_irq_connect_data *irq) |
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225 | { |
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226 | } |
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227 | |
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228 | static int |
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229 | mpc8xx_spi_irq_isOn(const rtems_irq_connect_data *irq) |
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230 | { |
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231 | return 1; |
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232 | } |
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233 | |
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234 | /*=========================================================================*\ |
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235 | | Function: | |
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236 | \*-------------------------------------------------------------------------*/ |
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237 | static void m8xx_spi_install_irq_handler |
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238 | ( |
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239 | /*-------------------------------------------------------------------------*\ |
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240 | | Purpose: | |
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241 | | install the interrupt handler | |
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242 | +---------------------------------------------------------------------------+ |
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243 | | Input Parameters: | |
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244 | \*-------------------------------------------------------------------------*/ |
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245 | m8xx_spi_softc_t *softc_ptr, /* ptr to control structure */ |
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246 | int install /* TRUE: install, FALSE: remove */ |
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247 | ) |
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248 | /*-------------------------------------------------------------------------*\ |
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249 | | Return Value: | |
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250 | | <none> | |
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251 | \*=========================================================================*/ |
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252 | { |
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253 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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254 | |
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255 | /* |
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256 | * install handler for SPI device |
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257 | */ |
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258 | /* |
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259 | * create semaphore for IRQ synchronization |
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260 | */ |
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261 | rc = rtems_semaphore_create(rtems_build_name('s','p','i','s'), |
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262 | 0, |
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263 | RTEMS_FIFO |
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264 | | RTEMS_SIMPLE_BINARY_SEMAPHORE, |
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265 | 0, |
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266 | &softc_ptr->irq_sema_id); |
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267 | if (rc != RTEMS_SUCCESSFUL) { |
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268 | rtems_panic("SPI: cannot create semaphore"); |
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269 | } |
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270 | if (rc == RTEMS_SUCCESSFUL) { |
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271 | rtems_irq_connect_data irq_conn_data = { |
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272 | BSP_CPM_IRQ_SPI, |
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273 | m8xx_spi_irq_handler, /* rtems_irq_hdl */ |
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274 | (rtems_irq_hdl_param)softc_ptr, /* (rtems_irq_hdl_param) */ |
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275 | mpc8xx_spi_irq_on, /* (rtems_irq_enable) */ |
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276 | mpc8xx_spi_irq_off, /* (rtems_irq_disable) */ |
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277 | mpc8xx_spi_irq_isOn /* (rtems_irq_is_enabled) */ |
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278 | }; |
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279 | if (!BSP_install_rtems_irq_handler (&irq_conn_data)) { |
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280 | rtems_panic("SPI: cannot install IRQ handler"); |
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281 | } |
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282 | } |
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283 | } |
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284 | |
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285 | /*=========================================================================*\ |
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286 | | Function: | |
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287 | \*-------------------------------------------------------------------------*/ |
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288 | rtems_status_code m8xx_spi_init |
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289 | ( |
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290 | /*-------------------------------------------------------------------------*\ |
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291 | | Purpose: | |
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292 | | initialize the driver | |
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293 | +---------------------------------------------------------------------------+ |
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294 | | Input Parameters: | |
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295 | \*-------------------------------------------------------------------------*/ |
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296 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
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297 | ) |
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298 | /*-------------------------------------------------------------------------*\ |
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299 | | Return Value: | |
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300 | | o = ok or error code | |
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301 | \*=========================================================================*/ |
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302 | { |
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303 | m8xx_spi_softc_t *softc_ptr = &(((m8xx_spi_desc_t *)(bh))->softc); |
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304 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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305 | |
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306 | #if defined(DEBUG) |
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307 | printk("m8xx_spi_init called... "); |
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308 | #endif |
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309 | /* |
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310 | * init HW registers: |
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311 | */ |
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312 | /* |
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313 | * FIXME: set default mode in SPMODE |
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314 | */ |
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315 | |
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316 | /* |
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317 | * allocate BDs (1x RX, 1x TX) |
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318 | */ |
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319 | if (rc == RTEMS_SUCCESSFUL) { |
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320 | softc_ptr->rx_bd = m8xx_bd_allocate (1); |
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321 | softc_ptr->tx_bd = m8xx_bd_allocate (1); |
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322 | if ((softc_ptr->rx_bd == NULL) || |
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323 | (softc_ptr->tx_bd == NULL)) { |
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324 | rc = RTEMS_NO_MEMORY; |
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325 | } |
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326 | } |
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327 | /* |
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328 | * set parameter RAM |
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329 | */ |
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330 | m8xx.spip.rbase = (char *)softc_ptr->rx_bd - (char *)&m8xx; |
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331 | m8xx.spip.tbase = (char *)softc_ptr->tx_bd - (char *)&m8xx; |
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332 | m8xx.spip.rfcr = M8xx_RFCR_MOT | M8xx_RFCR_DMA_SPACE(0); |
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333 | m8xx.spip.tfcr = M8xx_RFCR_MOT | M8xx_RFCR_DMA_SPACE(0); |
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334 | m8xx.spip.mrblr = 2; |
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335 | |
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336 | /* |
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337 | * issue "InitRxTx" Command to CP |
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338 | */ |
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339 | m8xx_cp_execute_cmd (M8xx_CR_OP_INIT_RX_TX | M8xx_CR_CHAN_SPI); |
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340 | |
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341 | /* |
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342 | * init interrupt stuff |
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343 | */ |
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344 | if (rc == RTEMS_SUCCESSFUL) { |
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345 | m8xx_spi_install_irq_handler(softc_ptr,TRUE); |
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346 | } |
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347 | if (rc == RTEMS_SUCCESSFUL) { |
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348 | /* |
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349 | * set up ports |
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350 | * LINE PAR DIR DAT |
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351 | * ----------------------- |
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352 | * MOSI 1 1 x |
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353 | * MISO 1 1 x |
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354 | * CLK 1 1 x |
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355 | */ |
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356 | |
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357 | /* set Port B Pin Assignment Register... */ |
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358 | m8xx.pbpar = |
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359 | m8xx.pbpar |
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360 | | M8xx_PB_SPI_MISO_MSK |
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361 | | M8xx_PB_SPI_MOSI_MSK |
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362 | | M8xx_PB_SPI_CLK_MSK; |
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363 | |
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364 | /* set Port B Data Direction Register... */ |
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365 | m8xx.pbdir = |
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366 | m8xx.pbdir |
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367 | | M8xx_PB_SPI_MISO_MSK |
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368 | | M8xx_PB_SPI_MOSI_MSK |
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369 | | M8xx_PB_SPI_CLK_MSK; |
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370 | } |
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371 | /* |
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372 | * mark, that we have initialized |
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373 | */ |
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374 | if (rc == RTEMS_SUCCESSFUL) { |
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375 | softc_ptr->initialized = TRUE; |
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376 | } |
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377 | #if defined(DEBUG) |
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378 | printk("... exit OK\r\n"); |
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379 | #endif |
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380 | return rc; |
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381 | } |
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382 | |
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383 | |
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384 | /*=========================================================================*\ |
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385 | | Function: | |
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386 | \*-------------------------------------------------------------------------*/ |
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387 | static int m8xx_spi_read_write_bytes |
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388 | ( |
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389 | /*-------------------------------------------------------------------------*\ |
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390 | | Purpose: | |
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391 | | transmit/receive some bytes from SPI device | |
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392 | +---------------------------------------------------------------------------+ |
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393 | | Input Parameters: | |
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394 | \*-------------------------------------------------------------------------*/ |
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395 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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396 | unsigned char *rbuf, /* buffer to store bytes */ |
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397 | const unsigned char *tbuf, /* buffer to send bytes */ |
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398 | int len /* number of bytes to transceive */ |
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399 | ) |
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400 | /*-------------------------------------------------------------------------*\ |
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401 | | Return Value: | |
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402 | | number of bytes received or (negative) error code | |
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403 | \*=========================================================================*/ |
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404 | { |
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405 | m8xx_spi_softc_t *softc_ptr = &(((m8xx_spi_desc_t *)(bh))->softc); |
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406 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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407 | int bc = 0; |
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408 | |
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409 | #if defined(DEBUG) |
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410 | printk("m8xx_spi_read_write_bytes called... "); |
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411 | #endif |
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412 | |
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413 | /* |
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414 | * prepare RxBD |
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415 | */ |
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416 | if (rc == RTEMS_SUCCESSFUL) { |
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417 | if (rbuf == NULL) { |
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418 | /* |
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419 | * no Tx buffer: receive to dummy buffer |
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420 | */ |
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421 | m8xx.spip.mrblr = sizeof(m8xx_spi_dummy_rxbuf); |
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422 | softc_ptr->rx_bd->buffer = m8xx_spi_dummy_rxbuf; |
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423 | softc_ptr->rx_bd->length = 0; |
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424 | softc_ptr->rx_bd->status = (M8xx_BD_EMPTY | M8xx_BD_WRAP | |
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425 | M8xx_BD_CONTINUOUS); |
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426 | } |
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427 | else { |
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428 | m8xx.spip.mrblr = len; |
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429 | softc_ptr->rx_bd->buffer = rbuf; |
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430 | softc_ptr->rx_bd->length = 0; |
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431 | softc_ptr->rx_bd->status = (M8xx_BD_EMPTY | M8xx_BD_WRAP); |
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432 | } |
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433 | } |
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434 | /* |
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435 | * prepare TxBD |
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436 | */ |
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437 | if (rc == RTEMS_SUCCESSFUL) { |
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438 | if (tbuf == NULL) { |
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439 | /* |
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440 | * no Tx buffer: transmit from dummy buffer |
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441 | */ |
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442 | softc_ptr->tx_bd->buffer = m8xx_spi_dummy_rxbuf; |
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443 | softc_ptr->tx_bd->length = len; |
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444 | softc_ptr->tx_bd->status = (M8xx_BD_READY | M8xx_BD_WRAP | |
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445 | M8xx_BD_CONTINUOUS); |
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446 | } |
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447 | else { |
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448 | softc_ptr->tx_bd->buffer = (char *)tbuf; |
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449 | softc_ptr->tx_bd->length = len; |
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450 | softc_ptr->tx_bd->status = (M8xx_BD_READY | M8xx_BD_WRAP); |
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451 | } |
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452 | } |
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453 | |
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454 | if (rc == RTEMS_SUCCESSFUL) { |
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455 | /* |
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456 | * set START command |
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457 | */ |
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458 | m8xx.spcom = M8xx_SPCOM_STR; |
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459 | /* |
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460 | * wait for SPI to finish |
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461 | */ |
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462 | rc = m8xx_spi_wait(softc_ptr); |
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463 | } |
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464 | #if defined(DEBUG) |
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465 | printk("... exit OK, rc=%d\r\n",bc); |
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466 | #endif |
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467 | return (rc == RTEMS_SUCCESSFUL) ? bc : -rc; |
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468 | } |
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469 | |
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470 | /*=========================================================================*\ |
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471 | | Function: | |
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472 | \*-------------------------------------------------------------------------*/ |
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473 | int m8xx_spi_read_bytes |
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474 | ( |
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475 | /*-------------------------------------------------------------------------*\ |
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476 | | Purpose: | |
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477 | | receive some bytes from SPI device | |
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478 | +---------------------------------------------------------------------------+ |
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479 | | Input Parameters: | |
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480 | \*-------------------------------------------------------------------------*/ |
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481 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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482 | unsigned char *buf, /* buffer to store bytes */ |
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483 | int len /* number of bytes to receive */ |
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484 | ) |
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485 | /*-------------------------------------------------------------------------*\ |
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486 | | Return Value: | |
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487 | | number of bytes received or (negative) error code | |
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488 | \*=========================================================================*/ |
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489 | { |
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490 | return m8xx_spi_read_write_bytes(bh,buf,NULL,len); |
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491 | } |
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492 | |
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493 | /*=========================================================================*\ |
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494 | | Function: | |
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495 | \*-------------------------------------------------------------------------*/ |
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496 | int m8xx_spi_write_bytes |
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497 | ( |
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498 | /*-------------------------------------------------------------------------*\ |
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499 | | Purpose: | |
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500 | | send some bytes to SPI device | |
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501 | +---------------------------------------------------------------------------+ |
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502 | | Input Parameters: | |
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503 | \*-------------------------------------------------------------------------*/ |
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504 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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505 | unsigned char *buf, /* buffer to send */ |
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506 | int len /* number of bytes to send */ |
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507 | |
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508 | ) |
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509 | /*-------------------------------------------------------------------------*\ |
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510 | | Return Value: | |
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511 | | number of bytes sent or (negative) error code | |
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512 | \*=========================================================================*/ |
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513 | { |
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514 | return m8xx_spi_read_write_bytes(bh,NULL,buf,len); |
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515 | } |
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516 | |
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517 | /*=========================================================================*\ |
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518 | | Function: | |
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519 | \*-------------------------------------------------------------------------*/ |
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520 | rtems_status_code m8xx_spi_set_tfr_mode |
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521 | ( |
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522 | /*-------------------------------------------------------------------------*\ |
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523 | | Purpose: | |
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524 | | set SPI to desired baudrate/clock mode/character mode | |
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525 | +---------------------------------------------------------------------------+ |
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526 | | Input Parameters: | |
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527 | \*-------------------------------------------------------------------------*/ |
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528 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
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529 | const rtems_libi2c_tfr_mode_t *tfr_mode /* transfer mode info */ |
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530 | ) |
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531 | /*-------------------------------------------------------------------------*\ |
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532 | | Return Value: | |
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533 | | rtems_status_code | |
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534 | \*=========================================================================*/ |
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535 | { |
---|
536 | m8xx_spi_softc_t *softc_ptr = &(((m8xx_spi_desc_t *)(bh))->softc); |
---|
537 | uint32_t spimode_baud; |
---|
538 | uint16_t spimode; |
---|
539 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
---|
540 | /* |
---|
541 | * FIXME: set proper mode |
---|
542 | */ |
---|
543 | if (rc == RTEMS_SUCCESSFUL) { |
---|
544 | rc = m8xx_spi_baud_to_mode(tfr_mode->baudrate,&spimode_baud); |
---|
545 | } |
---|
546 | if (rc == RTEMS_SUCCESSFUL) { |
---|
547 | rc = m8xx_spi_char_mode(softc_ptr, |
---|
548 | tfr_mode->bits_per_char, |
---|
549 | tfr_mode->lsb_first, |
---|
550 | &spimode); |
---|
551 | } |
---|
552 | if (rc == RTEMS_SUCCESSFUL) { |
---|
553 | spimode |= spimode_baud; |
---|
554 | spimode |= M8xx_SPMODE_MASTER; /* set master mode */ |
---|
555 | if (!tfr_mode->lsb_first) { |
---|
556 | spimode |= M8xx_SPMODE_REV; |
---|
557 | } |
---|
558 | if (tfr_mode->clock_inv) { |
---|
559 | spimode |= M8xx_SPMODE_CI; |
---|
560 | } |
---|
561 | if (tfr_mode->clock_phs) { |
---|
562 | spimode |= M8xx_SPMODE_CP; |
---|
563 | } |
---|
564 | } |
---|
565 | |
---|
566 | if (rc == RTEMS_SUCCESSFUL) { |
---|
567 | /* |
---|
568 | * disable SPI |
---|
569 | */ |
---|
570 | m8xx.spmode &= ~M8xx_SPMODE_EN; |
---|
571 | /* |
---|
572 | * set new mode and reenable SPI |
---|
573 | */ |
---|
574 | m8xx.spmode = spimode | M8xx_SPMODE_EN; |
---|
575 | } |
---|
576 | return rc; |
---|
577 | } |
---|
578 | |
---|
579 | |
---|
580 | /*=========================================================================*\ |
---|
581 | | Function: | |
---|
582 | \*-------------------------------------------------------------------------*/ |
---|
583 | int m8xx_spi_ioctl |
---|
584 | ( |
---|
585 | /*-------------------------------------------------------------------------*\ |
---|
586 | | Purpose: | |
---|
587 | | perform selected ioctl function for SPI | |
---|
588 | +---------------------------------------------------------------------------+ |
---|
589 | | Input Parameters: | |
---|
590 | \*-------------------------------------------------------------------------*/ |
---|
591 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
---|
592 | int cmd, /* ioctl command code */ |
---|
593 | void *arg /* additional argument array */ |
---|
594 | ) |
---|
595 | /*-------------------------------------------------------------------------*\ |
---|
596 | | Return Value: | |
---|
597 | | rtems_status_code | |
---|
598 | \*=========================================================================*/ |
---|
599 | { |
---|
600 | int ret_val = -1; |
---|
601 | |
---|
602 | switch(cmd) { |
---|
603 | case RTEMS_LIBI2C_IOCTL_SET_TFRMODE: |
---|
604 | ret_val = |
---|
605 | -m8xx_spi_set_tfr_mode(bh, |
---|
606 | (const rtems_libi2c_tfr_mode_t *)arg); |
---|
607 | break; |
---|
608 | case RTEMS_LIBI2C_IOCTL_READ_WRITE: |
---|
609 | ret_val = |
---|
610 | m8xx_spi_read_write_bytes(bh, |
---|
611 | ((rtems_libi2c_read_write_t *)arg)->rd_buf, |
---|
612 | ((rtems_libi2c_read_write_t *)arg)->wr_buf, |
---|
613 | ((rtems_libi2c_read_write_t *)arg)->byte_cnt); |
---|
614 | break; |
---|
615 | default: |
---|
616 | ret_val = -RTEMS_NOT_DEFINED; |
---|
617 | break; |
---|
618 | } |
---|
619 | return ret_val; |
---|
620 | } |
---|
621 | |
---|
622 | /*=========================================================================*\ |
---|
623 | | Board-specific adaptation functions | |
---|
624 | \*=========================================================================*/ |
---|
625 | |
---|
626 | /*=========================================================================*\ |
---|
627 | | Function: | |
---|
628 | \*-------------------------------------------------------------------------*/ |
---|
629 | static rtems_status_code bsp_spi_send_start |
---|
630 | ( |
---|
631 | /*-------------------------------------------------------------------------*\ |
---|
632 | | Purpose: | |
---|
633 | | dummy function, SPI has no start condition | |
---|
634 | +---------------------------------------------------------------------------+ |
---|
635 | | Input Parameters: | |
---|
636 | \*-------------------------------------------------------------------------*/ |
---|
637 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
---|
638 | ) |
---|
639 | /*-------------------------------------------------------------------------*\ |
---|
640 | | Return Value: | |
---|
641 | | o = ok or error code | |
---|
642 | \*=========================================================================*/ |
---|
643 | { |
---|
644 | return RTEMS_SUCCESSFUL; |
---|
645 | } |
---|
646 | |
---|
647 | /*=========================================================================*\ |
---|
648 | | Function: | |
---|
649 | \*-------------------------------------------------------------------------*/ |
---|
650 | static rtems_status_code bsp_spi_sel_addr |
---|
651 | ( |
---|
652 | /*-------------------------------------------------------------------------*\ |
---|
653 | | Purpose: | |
---|
654 | | address a slave device on the bus | |
---|
655 | +---------------------------------------------------------------------------+ |
---|
656 | | Input Parameters: | |
---|
657 | \*-------------------------------------------------------------------------*/ |
---|
658 | rtems_libi2c_bus_t *bh, /* bus specifier structure */ |
---|
659 | uint32_t addr, /* address to send on bus */ |
---|
660 | int rw /* 0=write,1=read */ |
---|
661 | ) |
---|
662 | /*-------------------------------------------------------------------------*\ |
---|
663 | | Return Value: | |
---|
664 | | rtems_status_code | |
---|
665 | \*=========================================================================*/ |
---|
666 | { |
---|
667 | #if defined(PGHPLUS) |
---|
668 | pbdat_val = m8xx.pbdat | (PGHPLUS_SPI_PB_DISP4_RS_MSK | |
---|
669 | PGHPLUS_SPI_PB_DISP4_CE_MSK | |
---|
670 | PGHPLUS_SPI_PB_EEP_CE_MSK); |
---|
671 | /* |
---|
672 | * select given device |
---|
673 | */ |
---|
674 | switch(addr) { |
---|
675 | case PGHPLUS_SPI_ADDR_EEPROM: |
---|
676 | pbdat_val &= ~PGHPLUS_SPI_PB_EEP_CE_MSK; |
---|
677 | break; |
---|
678 | case PGHPLUS_SPI_ADDR_DISP4_DATA: |
---|
679 | pbdat_val = (m8xx.pbdat |
---|
680 | & ~(PGHPLUS_PB_SPI_DISP4_CE_MSK | |
---|
681 | PGHPLUS_PB_SPI_DISP4_RS_MSK)); |
---|
682 | break; |
---|
683 | case PGHPLUS_SPI_ADDR_DISP4_CTRL: |
---|
684 | pbdat_val = (m8xx.pbdat |
---|
685 | & ~(PGHPLUS_PB_SPI_DISP4_CE_MSK) |
---|
686 | | PGHPLUS_PB_SPI_DISP4_RS_MSK); |
---|
687 | break; |
---|
688 | default: |
---|
689 | return RTEMS_INVALID_NUMBER; |
---|
690 | } |
---|
691 | m8xx_pbdat = pbdat_val |
---|
692 | #endif /* PGHPLUS */ |
---|
693 | return RTEMS_SUCCESSFUL; |
---|
694 | } |
---|
695 | |
---|
696 | /*=========================================================================*\ |
---|
697 | | Function: | |
---|
698 | \*-------------------------------------------------------------------------*/ |
---|
699 | static rtems_status_code bsp_spi_send_stop |
---|
700 | ( |
---|
701 | /*-------------------------------------------------------------------------*\ |
---|
702 | | Purpose: | |
---|
703 | | deselect SPI | |
---|
704 | +---------------------------------------------------------------------------+ |
---|
705 | | Input Parameters: | |
---|
706 | \*-------------------------------------------------------------------------*/ |
---|
707 | rtems_libi2c_bus_t *bh /* bus specifier structure */ |
---|
708 | ) |
---|
709 | /*-------------------------------------------------------------------------*\ |
---|
710 | | Return Value: | |
---|
711 | | o = ok or error code | |
---|
712 | \*=========================================================================*/ |
---|
713 | { |
---|
714 | #if defined(DEBUG) |
---|
715 | printk("bsp_spi_send_stop called... "); |
---|
716 | #endif |
---|
717 | m8xx.pbdat = (m8xx.pbdat |
---|
718 | | PGHPLUS_PB_SPI_DISP4_CE_MSK |
---|
719 | | PGHPLUS_PB_SPI_EEP_CE_MSK); |
---|
720 | #if defined(DEBUG) |
---|
721 | printk("... exit OK\r\n"); |
---|
722 | #endif |
---|
723 | return RTEMS_SUCCESSFUL; |
---|
724 | } |
---|
725 | |
---|
726 | /*=========================================================================*\ |
---|
727 | | Function: | |
---|
728 | \*-------------------------------------------------------------------------*/ |
---|
729 | static rtems_status_code bsp_spi_init |
---|
730 | ( |
---|
731 | /*-------------------------------------------------------------------------*\ |
---|
732 | | Purpose: | |
---|
733 | | do board specific init: | |
---|
734 | | - initialize pins for addressing | |
---|
735 | | - register further drivers | |
---|
736 | +---------------------------------------------------------------------------+ |
---|
737 | | Input Parameters: | |
---|
738 | \*-------------------------------------------------------------------------*/ |
---|
739 | int spi_busno |
---|
740 | ) |
---|
741 | /*-------------------------------------------------------------------------*\ |
---|
742 | | Return Value: | |
---|
743 | | o = ok or error code | |
---|
744 | \*=========================================================================*/ |
---|
745 | { |
---|
746 | int ret_code; |
---|
747 | |
---|
748 | #if defined(DEBUG) |
---|
749 | printk("bsp_spi_init called... "); |
---|
750 | #endif |
---|
751 | |
---|
752 | /* |
---|
753 | * init port pins used to address/select SPI devices |
---|
754 | */ |
---|
755 | |
---|
756 | /* |
---|
757 | * set up ports |
---|
758 | * LINE PAR DIR DAT |
---|
759 | * ----------------------- |
---|
760 | * EEP_CE 0 1 act-high |
---|
761 | * DISP4_CS 0 1 act-high |
---|
762 | * DISP4_RS 0 1 active |
---|
763 | */ |
---|
764 | |
---|
765 | /* set Port B Pin Assignment Register... */ |
---|
766 | m8xx.pbpar = |
---|
767 | (m8xx.pbpar |
---|
768 | & ~(PGHPLUS_PB_SPI_EEP_CE_MSK |
---|
769 | | PGHPLUS_PB_SPI_DISP4_CE_MSK |
---|
770 | | PGHPLUS_PB_SPI_DISP4_RS_MSK)); |
---|
771 | |
---|
772 | /* set Port B Data Direction Register... */ |
---|
773 | m8xx.pbdir = |
---|
774 | m8xx.pbdir |
---|
775 | | PGHPLUS_PB_SPI_EEP_CE_MSK |
---|
776 | | PGHPLUS_PB_SPI_DISP4_CE_MSK |
---|
777 | | PGHPLUS_PB_SPI_DISP4_RS_MSK; |
---|
778 | |
---|
779 | /* set Port B Data Register to inactive CE state */ |
---|
780 | m8xx.pbdat = |
---|
781 | m8xx.pbdat |
---|
782 | | PGHPLUS_PB_SPI_DISP4_CE_MSK |
---|
783 | | PGHPLUS_PB_SPI_DISP4_RS_MSK; |
---|
784 | |
---|
785 | /* |
---|
786 | * register devices |
---|
787 | */ |
---|
788 | ret_code = rtems_libi2c_register_drv("disp", |
---|
789 | disp_hcms29xx_driver_descriptor, |
---|
790 | spi_busno,PGHPLUS_SPI_ADDR_DISP4); |
---|
791 | if (ret_code < 0) { |
---|
792 | return -ret_code; |
---|
793 | } |
---|
794 | |
---|
795 | #if defined(DEBUG) |
---|
796 | printk("... exit OK\r\n"); |
---|
797 | #endif |
---|
798 | return RTEMS_SUCCESSFUL; |
---|
799 | } |
---|
800 | |
---|
801 | /*=========================================================================*\ |
---|
802 | | list of handlers | |
---|
803 | \*=========================================================================*/ |
---|
804 | |
---|
805 | rtems_libi2c_bus_ops_t bsp_spi_ops = { |
---|
806 | init: m8xx_spi_init, |
---|
807 | send_start: bsp_spi_send_start, |
---|
808 | send_stop: bsp_spi_send_stop, |
---|
809 | send_addr: bsp_spi_sel_addr, |
---|
810 | read_bytes: m8xx_spi_read_bytes, |
---|
811 | write_bytes: m8xx_spi_write_bytes, |
---|
812 | ioctl: m8xx_spi_ioctl |
---|
813 | }; |
---|
814 | |
---|
815 | static m8xx_spi_desc_t bsp_spi_bus_desc = { |
---|
816 | {/* public fields */ |
---|
817 | ops: &bsp_spi_ops, |
---|
818 | size: sizeof(bsp_spi_bus_desc) |
---|
819 | }, |
---|
820 | { /* our private fields */ |
---|
821 | initialized: FALSE |
---|
822 | } |
---|
823 | }; |
---|
824 | |
---|
825 | /*=========================================================================*\ |
---|
826 | | initialization | |
---|
827 | \*=========================================================================*/ |
---|
828 | |
---|
829 | /*=========================================================================*\ |
---|
830 | | Function: | |
---|
831 | \*-------------------------------------------------------------------------*/ |
---|
832 | rtems_status_code bsp_register_spi |
---|
833 | ( |
---|
834 | /*-------------------------------------------------------------------------*\ |
---|
835 | | Purpose: | |
---|
836 | | register SPI bus and devices | |
---|
837 | +---------------------------------------------------------------------------+ |
---|
838 | | Input Parameters: | |
---|
839 | \*-------------------------------------------------------------------------*/ |
---|
840 | void /* <none> */ |
---|
841 | ) |
---|
842 | /*-------------------------------------------------------------------------*\ |
---|
843 | | Return Value: | |
---|
844 | | 0 or error code | |
---|
845 | \*=========================================================================*/ |
---|
846 | { |
---|
847 | int ret_code; |
---|
848 | int spi_busno; |
---|
849 | |
---|
850 | /* |
---|
851 | * init I2C library (if not already done) |
---|
852 | */ |
---|
853 | rtems_libi2c_initialize (); |
---|
854 | |
---|
855 | |
---|
856 | /* |
---|
857 | * register SPI bus |
---|
858 | */ |
---|
859 | ret_code = rtems_libi2c_register_bus("/dev/spi", |
---|
860 | &(bsp_spi_bus_desc.bus_desc)); |
---|
861 | if (ret_code < 0) { |
---|
862 | return -ret_code; |
---|
863 | } |
---|
864 | spi_busno = ret_code; |
---|
865 | |
---|
866 | bsp_spi_init(spi_busno); |
---|
867 | /* |
---|
868 | * FIXME: further drivers, when available |
---|
869 | */ |
---|
870 | return RTEMS_SUCCESSFUL; |
---|
871 | } |
---|
872 | |
---|
873 | |
---|