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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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2455 | mario79 | 3 | ;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;; |
2288 | clevermous | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | $Revision: 2455 $ |
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9 | |||
10 | |||
11 | ;*************************************************************************** |
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12 | ; |
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13 | ; PCI CODE FOLLOWS |
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14 | ; |
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15 | ; the following functions provide access to the PCI interface. |
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16 | ; These functions are used by scan_bus, and also some ethernet drivers |
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17 | ; |
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18 | ;*************************************************************************** |
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19 | |||
20 | ; PCI Bus defines |
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21 | PCI_HEADER_TYPE equ 0x0e ;8 bit |
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22 | PCI_BASE_ADDRESS_0 equ 0x10 ;32 bit |
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23 | PCI_BASE_ADDRESS_5 equ 0x24 ;32 bits |
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24 | PCI_BASE_ADDRESS_SPACE_IO equ 0x01 |
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25 | PCI_VENDOR_ID equ 0x00 ;16 bit |
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26 | PCI_BASE_ADDRESS_IO_MASK equ 0xFFFFFFFC |
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27 | |||
28 | ;*************************************************************************** |
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29 | ; Function |
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30 | ; config_cmd |
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31 | ; |
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32 | ; Description |
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33 | ; creates a command dword for use with the PCI bus |
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34 | ; bus # in ebx |
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35 | ; devfn in ecx |
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36 | ; where in edx |
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37 | ; |
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38 | ; command dword returned in eax |
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39 | ; Only eax destroyed |
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40 | ;*************************************************************************** |
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41 | config_cmd: |
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42 | push ecx |
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43 | mov eax, ebx |
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44 | shl eax, 16 |
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45 | or eax, 0x80000000 |
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46 | shl ecx, 8 |
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47 | or eax, ecx |
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48 | pop ecx |
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49 | or eax, edx |
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50 | and eax, 0xFFFFFFFC |
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51 | ret |
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52 | |||
53 | ;*************************************************************************** |
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54 | ; Function |
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55 | ; pcibios_read_config_byte |
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56 | ; |
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57 | ; Description |
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58 | ; reads a byte from the PCI config space |
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59 | ; bus # in ebx |
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60 | ; devfn in ecx |
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61 | ; where in edx ( ls 16 bits significant ) |
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62 | ; |
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63 | ; byte returned in al ( rest of eax zero ) |
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64 | ; Only eax/edx destroyed |
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65 | ;*************************************************************************** |
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66 | pcibios_read_config_byte: |
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67 | call config_cmd |
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68 | push dx |
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69 | mov dx, 0xCF8 |
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70 | out dx, eax |
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71 | pop dx |
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72 | |||
73 | xor eax, eax |
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74 | and dx, 0x03 |
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75 | add dx, 0xCFC |
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76 | ; and dx, 0xFFC |
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77 | in al, dx |
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78 | ret |
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79 | |||
80 | ;*************************************************************************** |
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81 | ; Function |
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82 | ; pcibios_read_config_word |
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83 | ; |
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84 | ; Description |
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85 | ; reads a word from the PCI config space |
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86 | ; bus # in ebx |
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87 | ; devfn in ecx |
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88 | ; where in edx ( ls 16 bits significant ) |
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89 | ; |
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90 | ; word returned in ax ( rest of eax zero ) |
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91 | ; Only eax/edx destroyed |
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92 | ;*************************************************************************** |
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93 | pcibios_read_config_word: |
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94 | call config_cmd |
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95 | push dx |
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96 | mov dx, 0xCF8 |
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97 | out dx, eax |
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98 | pop dx |
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99 | |||
100 | xor eax, eax |
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101 | and dx, 0x02 |
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102 | add dx, 0xCFC |
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103 | ; and dx, 0xFFC |
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104 | in ax, dx |
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105 | ret |
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106 | |||
107 | ;*************************************************************************** |
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108 | ; Function |
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109 | ; pcibios_read_config_dword |
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110 | ; |
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111 | ; Description |
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112 | ; reads a dword from the PCI config space |
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113 | ; bus # in ebx |
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114 | ; devfn in ecx |
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115 | ; where in edx ( ls 16 bits significant ) |
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116 | ; |
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117 | ; dword returned in eax |
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118 | ; Only eax/edx destroyed |
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119 | ;*************************************************************************** |
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120 | pcibios_read_config_dword: |
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121 | push edx |
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122 | call config_cmd |
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123 | push dx |
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124 | mov dx, 0xCF8 |
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125 | out dx, eax |
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126 | pop dx |
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127 | xor eax, eax |
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128 | mov dx, 0xCFC |
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129 | in eax, dx |
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130 | pop edx |
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131 | ret |
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132 | |||
133 | ;*************************************************************************** |
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134 | ; Function |
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135 | ; pcibios_write_config_byte |
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136 | ; |
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137 | ; Description |
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138 | ; write a byte in al to the PCI config space |
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139 | ; bus # in ebx |
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140 | ; devfn in ecx |
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141 | ; where in edx ( ls 16 bits significant ) |
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142 | ; |
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143 | ; Only eax/edx destroyed |
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144 | ;*************************************************************************** |
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145 | pcibios_write_config_byte: |
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146 | push ax |
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147 | call config_cmd |
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148 | push dx |
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149 | mov dx, 0xCF8 |
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150 | out dx, eax |
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151 | pop dx |
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152 | pop ax |
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153 | |||
154 | and dx, 0x03 |
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155 | add dx, 0xCFC |
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156 | out dx, al |
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157 | ret |
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158 | |||
159 | ;*************************************************************************** |
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160 | ; Function |
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161 | ; pcibios_write_config_word |
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162 | ; |
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163 | ; Description |
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164 | ; write a word in ax to the PCI config space |
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165 | ; bus # in ebx |
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166 | ; devfn in ecx |
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167 | ; where in edx ( ls 16 bits significant ) |
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168 | ; |
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169 | ; Only eax/edx destroyed |
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170 | ;*************************************************************************** |
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171 | pcibios_write_config_word: |
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172 | push ax |
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173 | call config_cmd |
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174 | push dx |
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175 | mov dx, 0xCF8 |
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176 | out dx, eax |
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177 | pop dx |
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178 | pop ax |
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179 | |||
180 | and dx, 0x02 |
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181 | add dx, 0xCFC |
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182 | out dx, ax |
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183 | ret |
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184 | |||
185 | ;*************************************************************************** |
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186 | ; Function |
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187 | ; delay_us |
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188 | ; |
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189 | ; Description |
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190 | ; delays for 30 to 60 us |
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191 | ; |
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192 | ; I would prefer this routine to be able to delay for |
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193 | ; a selectable number of microseconds, but this works for now. |
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194 | ; |
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195 | ; If you know a better way to do 2us delay, pleae tell me! |
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196 | ;*************************************************************************** |
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197 | delay_us: |
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198 | push eax |
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199 | push ecx |
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200 | |||
201 | mov ecx, 2 |
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202 | |||
203 | in al, 0x61 |
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204 | and al, 0x10 |
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205 | mov ah, al |
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206 | cld |
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207 | |||
208 | dcnt1: |
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209 | in al, 0x61 |
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210 | and al, 0x10 |
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211 | cmp al, ah |
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212 | jz dcnt1 |
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213 | |||
214 | mov ah, al |
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215 | loop dcnt1 |
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216 | |||
217 | pop ecx |
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218 | pop eax |
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219 | |||
220 | ret |
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221 | |||
222 | ;*************************************************************************** |
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223 | ; Function |
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224 | ; scan_bus |
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225 | ; |
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226 | ; Description |
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227 | ; Scans the PCI bus for a supported device |
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228 | ; If a supported device is found, the drvr_ variables are initialised |
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229 | ; to that drivers functions ( as defined in the PCICards table) |
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230 | ; |
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231 | ; io_addr holds card I/O space. 32 bit, but only LS 16 bits valid |
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232 | ; pci_data holds the PCI vendor + device code |
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233 | ; pci_dev holds PCI bus dev # |
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234 | ; pci_bus holds PCI bus # |
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235 | ; |
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236 | ; io_addr will be zero if no card found |
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237 | ; |
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238 | ;*************************************************************************** |
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239 | scan_bus: |
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240 | xor eax, eax |
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241 | mov [hdrtype], al |
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242 | mov [pci_data], eax |
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243 | |||
244 | xor ebx, ebx ; ebx = bus# 0 .. 255 |
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245 | |||
246 | sb_bus_loop: |
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247 | xor ecx, ecx ; ecx = devfn# 0 .. 254 ( not 255? ) |
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248 | |||
249 | sb_devf_loop: |
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250 | mov eax, ecx |
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251 | and eax, 0x07 |
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252 | |||
253 | cmp eax, 0 |
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254 | jne sb_001 |
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255 | |||
256 | mov edx, PCI_HEADER_TYPE |
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257 | call pcibios_read_config_byte |
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258 | mov [hdrtype], al |
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259 | jmp sb_002 |
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260 | |||
261 | sb_001: |
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262 | mov al, [hdrtype] |
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263 | and al, 0x80 |
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264 | cmp al, 0x80 |
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265 | jne sb_inc_devf |
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266 | |||
267 | sb_002: |
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268 | mov edx, PCI_VENDOR_ID |
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269 | call pcibios_read_config_dword |
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270 | mov [vendor_device], eax |
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271 | cmp eax, 0xffffffff |
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272 | je sb_empty |
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273 | cmp eax, 0 |
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274 | jne sb_check_vendor |
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275 | |||
276 | sb_empty: |
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277 | mov [hdrtype], byte 0 |
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278 | jmp sb_inc_devf |
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279 | |||
280 | sb_check_vendor: |
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281 | ; iterate though PCICards until end or match found |
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282 | mov esi, PCICards |
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283 | |||
284 | sb_check: |
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285 | cmp [esi], dword 0 |
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286 | je sb_inc_devf ; Quit if at last entry |
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287 | cmp eax, [esi] |
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288 | je sb_got_card |
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289 | add esi, PCICARDS_ENTRY_SIZE |
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290 | jmp sb_check |
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291 | |||
292 | sb_got_card: |
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293 | ; indicate that we have found the card |
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294 | mov [pci_data], eax |
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295 | mov [pci_dev], ecx |
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296 | mov [pci_bus], ebx |
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297 | |||
298 | ; Define the driver functions |
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299 | push eax |
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300 | mov eax, [esi+4] |
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301 | mov [drvr_probe], eax |
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302 | mov eax, [esi+8] |
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303 | mov [drvr_reset], eax |
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304 | mov eax, [esi+12] |
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305 | mov [drvr_poll], eax |
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306 | mov eax, [esi+16] |
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307 | mov [drvr_transmit], eax |
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308 | mov eax, [esi+20] |
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309 | mov [drvr_cable], eax |
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310 | pop eax |
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311 | |||
312 | mov edx, PCI_BASE_ADDRESS_0 |
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313 | |||
314 | sb_reg_check: |
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315 | call pcibios_read_config_dword |
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316 | mov [io_addr], eax |
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317 | and eax, PCI_BASE_ADDRESS_IO_MASK |
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318 | cmp eax, 0 |
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319 | je sb_inc_reg |
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320 | mov eax, [io_addr] |
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321 | and eax, PCI_BASE_ADDRESS_SPACE_IO |
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322 | cmp eax, 0 |
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323 | je sb_inc_reg |
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324 | |||
325 | mov eax, [io_addr] |
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326 | and eax, PCI_BASE_ADDRESS_IO_MASK |
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327 | mov [io_addr], eax |
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328 | |||
329 | sb_exit1: |
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330 | ret |
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331 | |||
332 | sb_inc_reg: |
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333 | add edx, 4 |
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334 | cmp edx, PCI_BASE_ADDRESS_5 |
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335 | jbe sb_reg_check |
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336 | |||
337 | sb_inc_devf: |
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338 | inc ecx |
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339 | cmp ecx, 255 |
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340 | jb sb_devf_loop |
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341 | inc ebx |
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342 | cmp ebx, 256 |
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343 | jb sb_bus_loop |
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344 | |||
345 | ; We get here if we didn't find our card |
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346 | ; set io_addr to 0 as an indication |
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347 | xor eax, eax |
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348 | mov [io_addr], eax |
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349 | |||
350 | sb_exit2: |
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351 | ret |