1 | /* GR1553B driver, used by BC, RT and/or BM driver |
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2 | * |
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3 | * COPYRIGHT (c) 2010. |
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4 | * Cobham Gaisler AB. |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * http://www.rtems.org/license/LICENSE. |
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9 | */ |
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10 | |
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11 | #include <stdlib.h> |
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12 | #include <grlib/ambapp_bus.h> |
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13 | |
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14 | #include <grlib/gr1553b.h> |
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15 | |
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16 | #include <grlib/grlib_impl.h> |
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17 | |
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18 | /* Driver Manager interface for BC, RT, BM, BRM, BC-BM and RT-BM */ |
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19 | |
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20 | #define GR1553B_WRITE_REG(adr, val) *(volatile uint32_t *)(adr) = (val) |
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21 | #define GR1553B_READ_REG(adr) (*(volatile uint32_t *)(adr)) |
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22 | |
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23 | #define FEAT_BC 0x1 |
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24 | #define FEAT_RT 0x2 |
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25 | #define FEAT_BM 0x4 |
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26 | |
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27 | #define ALLOC_BC 0x1 |
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28 | #define ALLOC_RT 0x2 |
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29 | #define ALLOC_BM 0x4 |
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30 | |
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31 | struct gr1553_device { |
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32 | struct drvmgr_dev *dev; |
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33 | int features; |
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34 | int alloc; |
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35 | }; |
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36 | |
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37 | struct gr1553_device_feature { |
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38 | struct gr1553_device_feature *next; |
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39 | struct gr1553_device *dev; |
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40 | int minor; |
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41 | }; |
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42 | |
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43 | /* Device lists */ |
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44 | static struct gr1553_device_feature *gr1553_bm_root = NULL; |
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45 | static struct gr1553_device_feature *gr1553_rt_root = NULL; |
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46 | static struct gr1553_device_feature *gr1553_bc_root = NULL; |
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47 | |
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48 | /* Driver registered */ |
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49 | static int gr1553_driver_registerd = 0; |
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50 | |
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51 | /* Add 'feat' to linked list pointed to by 'root'. A minor is also assigned. */ |
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52 | static void gr1553_list_add |
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53 | ( |
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54 | struct gr1553_device_feature **root, |
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55 | struct gr1553_device_feature *feat |
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56 | ) |
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57 | { |
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58 | int minor; |
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59 | struct gr1553_device_feature *curr; |
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60 | |
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61 | if ( *root == NULL ) { |
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62 | *root = feat; |
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63 | feat->next = NULL; |
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64 | feat->minor = 0; |
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65 | return; |
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66 | } |
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67 | |
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68 | minor = 0; |
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69 | retry_new_minor: |
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70 | curr = *root; |
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71 | while ( curr->next ) { |
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72 | if ( curr->minor == minor ) { |
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73 | minor++; |
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74 | goto retry_new_minor; |
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75 | } |
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76 | curr = curr->next; |
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77 | } |
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78 | |
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79 | feat->next = NULL; |
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80 | feat->minor = minor; |
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81 | curr->next = feat; |
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82 | } |
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83 | |
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84 | static struct gr1553_device_feature *gr1553_list_find |
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85 | ( |
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86 | struct gr1553_device_feature *root, |
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87 | int minor |
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88 | ) |
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89 | { |
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90 | struct gr1553_device_feature *curr = root; |
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91 | while ( curr ) { |
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92 | if ( curr->minor == minor ) { |
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93 | return curr; |
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94 | } |
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95 | curr = curr->next; |
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96 | } |
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97 | return NULL; |
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98 | } |
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99 | |
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100 | struct drvmgr_dev **gr1553_bc_open(int minor) |
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101 | { |
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102 | struct gr1553_device_feature *feat; |
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103 | |
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104 | feat = gr1553_list_find(gr1553_bc_root, minor); |
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105 | if ( feat == NULL ) |
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106 | return NULL; |
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107 | |
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108 | /* Only possible to allocate is RT and BC is free, |
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109 | * this is beacuse it is not possible to use the |
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110 | * RT and the BC at the same time. |
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111 | */ |
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112 | if ( feat->dev->alloc & (ALLOC_BC|ALLOC_RT) ) |
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113 | return NULL; |
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114 | |
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115 | /* Alloc BC device */ |
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116 | feat->dev->alloc |= ALLOC_BC; |
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117 | |
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118 | return &feat->dev->dev; |
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119 | } |
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120 | |
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121 | void gr1553_bc_close(struct drvmgr_dev **dev) |
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122 | { |
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123 | struct gr1553_device *d = (struct gr1553_device *)dev; |
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124 | |
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125 | d->alloc &= ~ALLOC_BC; |
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126 | } |
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127 | |
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128 | struct drvmgr_dev **gr1553_rt_open(int minor) |
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129 | { |
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130 | struct gr1553_device_feature *feat; |
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131 | |
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132 | feat = gr1553_list_find(gr1553_rt_root, minor); |
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133 | if ( feat == NULL ) |
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134 | return NULL; |
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135 | |
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136 | /* Only possible to allocate is RT and BC is free, |
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137 | * this is beacuse it is not possible to use the |
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138 | * RT and the BC at the same time. |
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139 | */ |
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140 | if ( feat->dev->alloc & (ALLOC_BC|ALLOC_RT) ) |
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141 | return NULL; |
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142 | |
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143 | /* Alloc RT device */ |
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144 | feat->dev->alloc |= ALLOC_RT; |
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145 | |
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146 | return &feat->dev->dev; |
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147 | } |
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148 | |
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149 | void gr1553_rt_close(struct drvmgr_dev **dev) |
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150 | { |
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151 | struct gr1553_device *d = (struct gr1553_device *)dev; |
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152 | |
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153 | d->alloc &= ~ALLOC_RT; |
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154 | } |
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155 | |
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156 | struct drvmgr_dev **gr1553_bm_open(int minor) |
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157 | { |
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158 | struct gr1553_device_feature *feat; |
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159 | |
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160 | feat = gr1553_list_find(gr1553_bm_root, minor); |
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161 | if ( feat == NULL ) |
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162 | return NULL; |
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163 | |
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164 | /* Only possible to allocate is RT and BC is free, |
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165 | * this is beacuse it is not possible to use the |
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166 | * RT and the BC at the same time. |
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167 | */ |
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168 | if ( feat->dev->alloc & ALLOC_BM ) |
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169 | return NULL; |
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170 | |
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171 | /* Alloc BM device */ |
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172 | feat->dev->alloc |= ALLOC_BM; |
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173 | |
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174 | return &feat->dev->dev; |
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175 | } |
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176 | |
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177 | void gr1553_bm_close(struct drvmgr_dev **dev) |
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178 | { |
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179 | struct gr1553_device *d = (struct gr1553_device *)dev; |
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180 | |
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181 | d->alloc &= ~ALLOC_BM; |
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182 | } |
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183 | |
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184 | static int gr1553_init2(struct drvmgr_dev *dev) |
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185 | { |
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186 | struct amba_dev_info *ambadev; |
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187 | struct ambapp_core *pnpinfo; |
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188 | struct gr1553b_regs *regs; |
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189 | |
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190 | /* Get device information from AMBA PnP information */ |
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191 | ambadev = (struct amba_dev_info *)dev->businfo; |
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192 | if ( ambadev == NULL ) { |
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193 | return DRVMGR_FAIL; |
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194 | } |
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195 | pnpinfo = &ambadev->info; |
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196 | if ( pnpinfo->apb_slv == NULL ) |
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197 | return DRVMGR_EIO; |
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198 | regs = (struct gr1553b_regs *)pnpinfo->apb_slv->start; |
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199 | |
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200 | /* Stop IRQ */ |
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201 | GR1553B_WRITE_REG(®s->imask, 0); |
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202 | GR1553B_WRITE_REG(®s->irq, 0xffffffff); |
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203 | /* Stop BC if not already stopped (just in case) */ |
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204 | GR1553B_WRITE_REG(®s->bc_ctrl, 0x15520204); |
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205 | /* Stop RT rx (just in case) */ |
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206 | GR1553B_WRITE_REG(®s->rt_cfg, 0x15530000); |
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207 | /* Stop BM logging (just in case) */ |
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208 | GR1553B_WRITE_REG(®s->bm_ctrl, 0); |
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209 | |
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210 | return DRVMGR_OK; |
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211 | } |
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212 | |
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213 | /* Register the different functionalities that the |
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214 | * core supports. |
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215 | */ |
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216 | static int gr1553_init3(struct drvmgr_dev *dev) |
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217 | { |
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218 | struct amba_dev_info *ambadev; |
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219 | struct ambapp_core *pnpinfo; |
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220 | struct gr1553_device *priv; |
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221 | struct gr1553_device_feature *feat; |
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222 | struct gr1553b_regs *regs; |
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223 | |
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224 | priv = grlib_malloc(sizeof(*priv)); |
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225 | if ( priv == NULL ) |
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226 | return DRVMGR_NOMEM; |
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227 | priv->dev = dev; |
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228 | priv->alloc = 0; |
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229 | priv->features = 0; |
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230 | dev->priv = NULL; /* Let higher level driver handle this */ |
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231 | |
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232 | /* Get device information from AMBA PnP information */ |
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233 | ambadev = (struct amba_dev_info *)dev->businfo; |
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234 | pnpinfo = &ambadev->info; |
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235 | regs = (struct gr1553b_regs *)pnpinfo->apb_slv->start; |
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236 | |
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237 | if ( GR1553B_READ_REG(®s->bm_stat) & GR1553B_BM_STAT_BMSUP ) { |
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238 | priv->features |= FEAT_BM; |
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239 | feat = grlib_malloc(sizeof(*feat)); |
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240 | feat->dev = priv; |
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241 | /* Init Minor and Next */ |
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242 | gr1553_list_add(&gr1553_bm_root, feat); |
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243 | } |
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244 | |
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245 | if ( GR1553B_READ_REG(®s->bc_stat) & GR1553B_BC_STAT_BCSUP ) { |
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246 | priv->features |= FEAT_BC; |
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247 | feat = grlib_malloc(sizeof(*feat)); |
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248 | feat->dev = priv; |
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249 | /* Init Minor and Next */ |
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250 | gr1553_list_add(&gr1553_bc_root, feat); |
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251 | } |
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252 | |
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253 | if ( GR1553B_READ_REG(®s->rt_stat) & GR1553B_RT_STAT_RTSUP ) { |
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254 | priv->features |= FEAT_RT; |
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255 | feat = grlib_malloc(sizeof(*feat)); |
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256 | feat->dev = priv; |
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257 | /* Init Minor and Next */ |
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258 | gr1553_list_add(&gr1553_rt_root, feat); |
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259 | } |
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260 | |
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261 | if ( priv->features == 0 ) { |
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262 | /* no features in HW should never happen.. an I/O error? */ |
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263 | free(priv); |
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264 | return DRVMGR_EIO; |
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265 | } |
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266 | |
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267 | return DRVMGR_OK; |
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268 | } |
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269 | |
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270 | struct drvmgr_drv_ops gr1553_ops = |
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271 | { |
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272 | {NULL, gr1553_init2, gr1553_init3, NULL}, |
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273 | NULL, |
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274 | NULL |
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275 | }; |
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276 | |
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277 | struct amba_dev_id gr1553_ids[] = |
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278 | { |
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279 | {VENDOR_GAISLER, GAISLER_GR1553B}, |
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280 | {0, 0} /* Mark end of table */ |
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281 | }; |
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282 | |
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283 | struct amba_drv_info gr1553_drv_info = |
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284 | { |
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285 | { |
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286 | DRVMGR_OBJ_DRV, /* Driver */ |
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287 | NULL, /* Next driver */ |
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288 | NULL, /* Device list */ |
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289 | DRIVER_AMBAPP_GAISLER_GR1553B_ID,/* Driver ID */ |
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290 | "GR1553_DRV", /* Driver Name */ |
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291 | DRVMGR_BUS_TYPE_AMBAPP, /* Bus Type */ |
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292 | &gr1553_ops, |
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293 | NULL, /* Funcs */ |
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294 | 0, /* No devices yet */ |
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295 | 0, |
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296 | }, |
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297 | &gr1553_ids[0] |
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298 | }; |
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299 | |
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300 | /* Multiple drivers may call this function. The drivers that depends on |
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301 | * this driver: |
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302 | * - BM driver |
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303 | * - BC driver |
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304 | * - RT driver |
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305 | */ |
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306 | void gr1553_register(void) |
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307 | { |
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308 | if ( gr1553_driver_registerd == 0 ) { |
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309 | gr1553_driver_registerd = 1; |
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310 | drvmgr_drv_register(&gr1553_drv_info.general); |
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311 | } |
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312 | } |
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