1 | /* Iterate over device tree topology, breadth or depth-first |
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2 | * |
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3 | * COPYRIGHT (c) 2009 Cobham Gaisler AB. |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.org/license/LICENSE. |
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8 | */ |
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9 | |
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10 | #include <string.h> |
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11 | #include <drvmgr/drvmgr.h> |
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12 | #include <drvmgr/drvmgr_list.h> |
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13 | #include "drvmgr_internal.h" |
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14 | |
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15 | /* Traverse device tree breadth-first. Supports up to 31 buses */ |
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16 | static int drvmgr_for_each_dev_breadth( |
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17 | int (*func)(struct drvmgr_dev *dev, void *arg), |
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18 | void *arg |
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19 | ) |
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20 | { |
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21 | int ret = 0, i, pos; |
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22 | struct drvmgr_bus *bus, *buses[32]; |
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23 | struct drvmgr_dev *dev; |
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24 | |
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25 | pos = 0; |
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26 | memset(&buses[0], 0, sizeof(buses)); |
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27 | buses[pos++] = drvmgr.root_dev.bus; /* Get root bus */ |
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28 | |
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29 | for (i = 0, bus = buses[0]; buses[i]; i++, bus = buses[i]) { |
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30 | dev = bus->children; |
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31 | while (dev) { |
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32 | ret = func(dev, arg); |
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33 | if (ret != 0) |
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34 | break; |
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35 | if (dev->bus && pos < 31) |
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36 | buses[pos++] = dev->bus; |
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37 | |
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38 | dev = dev->next_in_bus; |
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39 | } |
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40 | } |
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41 | |
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42 | return ret; |
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43 | } |
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44 | |
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45 | /* Traverse device tree depth-first. */ |
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46 | static int drvmgr_for_each_dev_depth( |
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47 | int (*func)(struct drvmgr_dev *dev, void *arg), |
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48 | void *arg |
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49 | ) |
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50 | { |
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51 | int ret = 0; |
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52 | struct drvmgr_dev *dev; |
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53 | |
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54 | /* Get first device */ |
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55 | dev = drvmgr.root_dev.bus->children; |
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56 | |
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57 | while (dev) { |
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58 | ret = func(dev, arg); |
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59 | if (ret != 0) |
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60 | break; |
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61 | if (dev->bus && dev->bus->children) { |
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62 | dev = dev->bus->children; |
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63 | } else { |
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64 | next_dev: |
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65 | if (dev->next_in_bus == NULL) { |
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66 | /* Step up one level... back to parent bus */ |
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67 | dev = dev->parent->dev; |
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68 | if (dev == &drvmgr.root_dev) |
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69 | break; |
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70 | goto next_dev; |
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71 | } else { |
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72 | dev = dev->next_in_bus; |
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73 | } |
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74 | } |
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75 | } |
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76 | |
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77 | return ret; |
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78 | } |
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79 | |
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80 | /* Traverse device tree depth-first or breadth-first */ |
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81 | int drvmgr_for_each_dev( |
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82 | int (*func)(struct drvmgr_dev *dev, void *arg), |
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83 | void *arg, |
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84 | int options |
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85 | ) |
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86 | { |
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87 | int ret; |
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88 | |
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89 | DRVMGR_LOCK_READ(); |
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90 | |
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91 | /* Get Root Device */ |
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92 | if (drvmgr.root_dev.bus->children != NULL) { |
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93 | if (options & DRVMGR_FED_BF) |
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94 | ret = drvmgr_for_each_dev_breadth(func, arg); |
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95 | else |
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96 | ret = drvmgr_for_each_dev_depth(func, arg); |
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97 | } else |
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98 | ret = 0; |
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99 | |
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100 | DRVMGR_UNLOCK(); |
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101 | |
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102 | return ret; |
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103 | } |
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