1 | /** |
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2 | * @file |
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3 | * |
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4 | * This file implements a BSP independent version of pci_find_device(). |
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5 | */ |
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6 | |
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7 | /* |
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8 | * The software in this file was based upon the pci_find_device() |
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9 | * implementation provided by Till Straumann under the following terms. |
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10 | * That implementation had been copied to multiple BSPs. This implementation |
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11 | * is BSP independent and follows RTEMS Project coding guidelines. |
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12 | * |
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13 | * COPYRIGHT (c) 2016. |
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14 | * On-Line Applications Research Corporation (OAR). |
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15 | * |
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16 | * Authorship |
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17 | * ---------- |
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18 | * This software was created by |
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19 | * Till Straumann <strauman@slac.stanford.edu>, 2001, |
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20 | * Stanford Linear Accelerator Center, Stanford University. |
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21 | * |
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22 | * Acknowledgement of sponsorship |
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23 | * ------------------------------ |
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24 | * This software was produced by |
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25 | * the Stanford Linear Accelerator Center, Stanford University, |
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26 | * under Contract DE-AC03-76SFO0515 with the Department of Energy. |
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27 | * |
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28 | * Government disclaimer of liability |
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29 | * ---------------------------------- |
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30 | * Neither the United States nor the United States Department of Energy, |
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31 | * nor any of their employees, makes any warranty, express or implied, or |
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32 | * assumes any legal liability or responsibility for the accuracy, |
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33 | * completeness, or usefulness of any data, apparatus, product, or process |
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34 | * disclosed, or represents that its use would not infringe privately owned |
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35 | * rights. |
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36 | * |
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37 | * Stanford disclaimer of liability |
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38 | * -------------------------------- |
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39 | * Stanford University makes no representations or warranties, express or |
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40 | * implied, nor assumes any liability for the use of this software. |
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41 | * |
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42 | * Stanford disclaimer of copyright |
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43 | * -------------------------------- |
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44 | * Stanford University, owner of the copyright, hereby disclaims its |
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45 | * copyright and all other rights in this software. Hence, anyone may |
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46 | * freely use it for any purpose without restriction. |
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47 | * |
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48 | * Maintenance of notices |
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49 | * ---------------------- |
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50 | * In the interest of clarity regarding the origin and status of this |
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51 | * SLAC software, this and all the preceding Stanford University notices |
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52 | * are to remain affixed to any copy or derivative of this software made |
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53 | * or distributed by the recipient and are to be affixed to any copy of |
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54 | * software made or distributed by the recipient that contains a copy or |
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55 | * derivative of this software. |
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56 | * |
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57 | * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 |
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58 | */ |
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59 | |
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60 | |
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61 | #include <rtems/pci.h> |
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62 | #include <rtems/bspIo.h> |
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63 | #include <inttypes.h> |
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64 | #include <stdio.h> |
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65 | |
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66 | /* |
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67 | * Public methods from this file |
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68 | */ |
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69 | void pci_dump(FILE *f); |
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70 | |
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71 | /* |
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72 | * These are used to construct the handle returned by pci_find_device() |
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73 | * but the caller does not need to know how to decode them. |
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74 | */ |
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75 | #define PCIB_DEVSIG_BUS(x) (((x)>>8) &0xff) |
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76 | #define PCIB_DEVSIG_DEV(x) (((x)>>3) & 0x1f) |
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77 | #define PCIB_DEVSIG_FUNC(x) ((x) & 0x7) |
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78 | #define PCIB_DEVSIG_MAKE(b,d,f) ((b<<8)|(d<<3)|(f)) |
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79 | |
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80 | /* |
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81 | * Function pointer to helper function called during bus iteration. |
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82 | */ |
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83 | typedef int (*pci_scan_helper_t)( |
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84 | int bus, |
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85 | int dev, |
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86 | int fun, |
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87 | void *uarg |
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88 | ); |
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89 | |
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90 | /* |
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91 | * |
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92 | */ |
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93 | static uint32_t pci_scan( |
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94 | uint32_t handle, |
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95 | pci_scan_helper_t helper, |
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96 | void *uarg |
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97 | ); |
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98 | |
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99 | typedef struct { |
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100 | uint16_t vendor_id; |
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101 | uint16_t device_id; |
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102 | int instance; |
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103 | uint8_t bus; |
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104 | uint8_t device; |
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105 | uint8_t function; |
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106 | } pci_scan_arg_t; |
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107 | |
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108 | static int find_dev_helper( |
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109 | int bus, |
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110 | int device, |
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111 | int function, |
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112 | void *uarg |
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113 | ) |
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114 | { |
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115 | pci_scan_arg_t *scan = uarg; |
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116 | uint16_t vendor_tmp; |
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117 | uint16_t device_tmp; |
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118 | |
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119 | pci_read_config_word(bus, device, function, PCI_VENDOR_ID, &vendor_tmp); |
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120 | if (scan->vendor_id == vendor_tmp) { |
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121 | pci_read_config_word(bus, device, function, PCI_DEVICE_ID, &device_tmp); |
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122 | if (scan->device_id == device_tmp && scan->instance-- == 0) { |
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123 | scan->bus = bus; |
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124 | scan->device = device; |
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125 | scan->function = function; |
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126 | |
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127 | return 1; |
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128 | } |
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129 | } |
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130 | return 0; |
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131 | } |
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132 | |
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133 | int pci_find_device( |
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134 | uint16_t vendorid, |
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135 | uint16_t deviceid, |
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136 | int instance, |
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137 | int *bus, |
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138 | int *device, |
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139 | int *function |
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140 | ) |
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141 | { |
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142 | pci_scan_arg_t scan; |
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143 | |
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144 | scan.instance = instance; |
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145 | scan.vendor_id = vendorid; |
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146 | scan.device_id = deviceid; |
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147 | |
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148 | if ( pci_scan(0, find_dev_helper, (void*)&scan) != 0 ) { |
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149 | *bus = scan.bus; |
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150 | *device = scan.device; |
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151 | *function = scan.function; |
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152 | return 0; |
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153 | } |
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154 | return -1; |
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155 | } |
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156 | |
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157 | static int dump_dev_helper( |
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158 | int bus, |
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159 | int device, |
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160 | int function, |
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161 | void *arg |
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162 | ) |
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163 | { |
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164 | uint16_t vendor_id; |
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165 | uint16_t device_id; |
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166 | uint16_t cmd; |
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167 | uint16_t status; |
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168 | uint32_t base0; |
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169 | uint32_t base1; |
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170 | uint8_t irq_pin; |
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171 | uint8_t int_line; |
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172 | FILE *fp = arg; |
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173 | |
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174 | pci_read_config_word (bus, device, function, PCI_VENDOR_ID, &vendor_id); |
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175 | pci_read_config_word (bus, device, function, PCI_DEVICE_ID, &device_id); |
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176 | pci_read_config_word (bus, device, function, PCI_COMMAND, &cmd); |
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177 | pci_read_config_word (bus, device, function, PCI_STATUS, &status); |
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178 | pci_read_config_dword(bus, device, function, PCI_BASE_ADDRESS_0, &base0); |
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179 | pci_read_config_dword(bus, device, function, PCI_BASE_ADDRESS_1, &base1); |
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180 | pci_read_config_byte (bus, device, function, PCI_INTERRUPT_PIN, &irq_pin); |
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181 | pci_read_config_byte (bus, device, function, PCI_INTERRUPT_LINE, &int_line); |
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182 | |
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183 | fprintf( |
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184 | fp, |
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185 | "%3d:0x%02x:%d 0x%04x:0x%04x 0x%04x 0x%04x 0x%08" PRIx32 " 0x%08" PRIx32 " %d %3d(0x%02x)\n", |
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186 | bus, |
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187 | device, |
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188 | function, |
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189 | vendor_id, |
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190 | device_id, |
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191 | cmd, |
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192 | status, |
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193 | base0, |
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194 | base1, |
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195 | irq_pin, |
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196 | int_line, |
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197 | int_line |
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198 | ); |
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199 | return 0; |
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200 | } |
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201 | |
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202 | void pci_dump( |
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203 | FILE *fp |
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204 | ) |
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205 | { |
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206 | if ( !fp ) |
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207 | fp = stdout; |
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208 | fprintf( |
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209 | fp, |
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210 | "BUS:SLOT:FUN VENDOR:DEV_ID CMD STAT BASE_ADDR0 BASE_ADDR1 INTn IRQ_LINE\n" |
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211 | ); |
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212 | pci_scan(0, dump_dev_helper, fp); |
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213 | } |
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214 | |
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215 | static uint32_t pci_scan( |
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216 | uint32_t handle, |
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217 | pci_scan_helper_t helper, |
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218 | void *arg |
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219 | ) |
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220 | { |
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221 | uint32_t vendor; |
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222 | uint8_t bus; |
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223 | uint8_t dev; |
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224 | uint8_t fun; |
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225 | uint8_t hd; |
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226 | |
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227 | bus = PCIB_DEVSIG_BUS( (unsigned long)handle ); |
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228 | dev = PCIB_DEVSIG_DEV( (unsigned long)handle ); |
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229 | fun = PCIB_DEVSIG_FUNC( (unsigned long)handle ); |
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230 | |
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231 | hd = fun > 0 ? PCI_MAX_FUNCTIONS : 1; |
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232 | |
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233 | for (; bus<pci_bus_count(); bus++, dev=0) { |
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234 | for (; dev<PCI_MAX_DEVICES; dev++, fun=0) { |
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235 | for (; fun<hd; fun++) { |
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236 | /* |
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237 | * The last devfn id/slot is special; must skip it |
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238 | */ |
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239 | if ((PCI_MAX_DEVICES-1 == dev) && (PCI_MAX_FUNCTIONS-1 == fun) ) |
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240 | break; |
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241 | |
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242 | (void)pci_read_config_dword(bus, dev, 0, PCI_VENDOR_ID, &vendor); |
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243 | if (PCI_INVALID_VENDORDEVICEID == vendor) |
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244 | continue; |
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245 | |
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246 | if ( fun == 0 ) { |
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247 | pci_read_config_byte(bus,dev, 0, PCI_HEADER_TYPE, &hd); |
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248 | hd = (hd & PCI_HEADER_TYPE_MULTI_FUNCTION ? PCI_MAX_FUNCTIONS : 1); |
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249 | } |
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250 | |
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251 | (void)pci_read_config_dword(bus, dev, fun, PCI_VENDOR_ID, &vendor); |
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252 | if (PCI_INVALID_VENDORDEVICEID == vendor) |
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253 | continue; |
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254 | #ifdef PCI_DEBUG |
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255 | fprintf( |
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256 | stderr, |
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257 | "pci_scan: found 0x%08" PRIx32 " at %d/x%02x/%d\n", vendor, bus, dev, fun |
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258 | ); |
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259 | #endif |
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260 | if ( (*helper)(bus, dev, fun, arg) > 0 ) { |
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261 | if ( ++fun >= hd ) { |
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262 | fun = 0; |
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263 | if ( ++dev >= PCI_MAX_DEVICES ) { |
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264 | dev = 0; |
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265 | bus++; |
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266 | } |
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267 | } |
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268 | return PCIB_DEVSIG_MAKE(bus,dev,fun); |
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269 | } |
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270 | } |
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271 | } |
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272 | } |
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273 | return 0; |
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274 | } |
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