include/sysemu/device_tree.h

   1 /*
   2  * Header with function prototypes to help device tree manipulation using
   3  * libfdt. It also provides functions to read entries from device tree proc
   4  * interface.
   5  *
   6  * Copyright 2008 IBM Corporation.
   7  * Authors: Jerone Young <jyoung5@us.ibm.com>
   8  *          Hollis Blanchard <hollisb@us.ibm.com>
   9  *
  10  * This work is licensed under the GNU GPL license version 2 or later.
  11  *
  12  */
  13
  14 #ifndef DEVICE_TREE_H
  15 #define DEVICE_TREE_H
  16
  17 void *create_device_tree(int *sizep);
  18 void *load_device_tree(const char *filename_path, int *sizep);
  19 #ifdef CONFIG_LINUX
  20 /**
  21  * load_device_tree_from_sysfs: reads the device tree information in the
  22  * /proc/device-tree directory and return the corresponding binary blob
  23  * buffer pointer. Asserts in case of error.
  24  */
  25 void *load_device_tree_from_sysfs(void);
  26 #endif
  27
  28 /**
  29  * qemu_fdt_node_path: return the paths of nodes matching a given
  30  * name and compat string
  31  * @fdt: pointer to the dt blob
  32  * @name: node name
  33  * @compat: compatibility string
  34  * @errp: handle to an error object
  35  *
  36  * returns a newly allocated NULL-terminated array of node paths.
  37  * Use g_strfreev() to free it. If one or more nodes were found, the
  38  * array contains the path of each node and the last element equals to
  39  * NULL. If there is no error but no matching node was found, the
  40  * returned array contains a single element equal to NULL. If an error
  41  * was encountered when parsing the blob, the function returns NULL
  42  *
  43  * @name may be NULL to wildcard names and only match compatibility
  44  * strings.
  45  */
  46 char **qemu_fdt_node_path(void *fdt, const char *name, const char *compat,
  47                           Error **errp);
  48
  49 /**
  50  * qemu_fdt_node_unit_path: return the paths of nodes matching a given
  51  * node-name, ie. node-name and node-name@unit-address
  52  * @fdt: pointer to the dt blob
  53  * @name: node name
  54  * @errp: handle to an error object
  55  *
  56  * returns a newly allocated NULL-terminated array of node paths.
  57  * Use g_strfreev() to free it. If one or more nodes were found, the
  58  * array contains the path of each node and the last element equals to
  59  * NULL. If there is no error but no matching node was found, the
  60  * returned array contains a single element equal to NULL. If an error
  61  * was encountered when parsing the blob, the function returns NULL
  62  */
  63 char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp);
  64
  65 int qemu_fdt_setprop(void *fdt, const char *node_path,
  66                      const char *property, const void *val, int size);
  67 int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
  68                           const char *property, uint32_t val);
  69 int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
  70                          const char *property, uint64_t val);
  71 int qemu_fdt_setprop_string(void *fdt, const char *node_path,
  72                             const char *property, const char *string);
  73 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
  74                              const char *property,
  75                              const char *target_node_path);
  76 /**
  77  * qemu_fdt_getprop: retrieve the value of a given property
  78  * @fdt: pointer to the device tree blob
  79  * @node_path: node path
  80  * @property: name of the property to find
  81  * @lenp: fdt error if any or length of the property on success
  82  * @errp: handle to an error object
  83  *
  84  * returns a pointer to the property on success and NULL on failure
  85  */
  86 const void *qemu_fdt_getprop(void *fdt, const char *node_path,
  87                              const char *property, int *lenp,
  88                              Error **errp);
  89 /**
  90  * qemu_fdt_getprop_cell: retrieve the value of a given 4 byte property
  91  * @fdt: pointer to the device tree blob
  92  * @node_path: node path
  93  * @property: name of the property to find
  94  * @lenp: fdt error if any or -EINVAL if the property size is different from
  95  *        4 bytes, or 4 (expected length of the property) upon success.
  96  * @errp: handle to an error object
  97  *
  98  * returns the property value on success
  99  */
 100 uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
 101                                const char *property, int *lenp,
 102                                Error **errp);
 103 uint32_t qemu_fdt_get_phandle(void *fdt, const char *path);
 104 uint32_t qemu_fdt_alloc_phandle(void *fdt);
 105 int qemu_fdt_nop_node(void *fdt, const char *node_path);
 106 int qemu_fdt_add_subnode(void *fdt, const char *name);
 107
 108 #define qemu_fdt_setprop_cells(fdt, node_path, property, ...)                 \
 109     do {                                                                      \
 110         uint32_t qdt_tmp[] = { __VA_ARGS__ };                                 \
 111         int i;                                                                \
 112                                                                               \
 113         for (i = 0; i < ARRAY_SIZE(qdt_tmp); i++) {                           \
 114             qdt_tmp[i] = cpu_to_be32(qdt_tmp[i]);                             \
 115         }                                                                     \
 116         qemu_fdt_setprop(fdt, node_path, property, qdt_tmp,                   \
 117                          sizeof(qdt_tmp));                                    \
 118     } while (0)
 119
 120 void qemu_fdt_dumpdtb(void *fdt, int size);
 121
 122 /**
 123  * qemu_fdt_setprop_sized_cells_from_array:
 124  * @fdt: device tree blob
 125  * @node_path: node to set property on
 126  * @property: property to set
 127  * @numvalues: number of values
 128  * @values: array of number-of-cells, value pairs
 129  *
 130  * Set the specified property on the specified node in the device tree
 131  * to be an array of cells. The values of the cells are specified via
 132  * the values list, which alternates between "number of cells used by
 133  * this value" and "value".
 134  * number-of-cells must be either 1 or 2 (other values will result in
 135  * an error being returned). If a value is too large to fit in the
 136  * number of cells specified for it, an error is returned.
 137  *
 138  * This function is useful because device tree nodes often have cell arrays
 139  * which are either lists of addresses or lists of address,size tuples, but
 140  * the number of cells used for each element vary depending on the
 141  * #address-cells and #size-cells properties of their parent node.
 142  * If you know all your cell elements are one cell wide you can use the
 143  * simpler qemu_fdt_setprop_cells(). If you're not setting up the
 144  * array programmatically, qemu_fdt_setprop_sized_cells may be more
 145  * convenient.
 146  *
 147  * Return value: 0 on success, <0 on error.
 148  */
 149 int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
 150                                             const char *node_path,
 151                                             const char *property,
 152                                             int numvalues,
 153                                             uint64_t *values);
 154
 155 /**
 156  * qemu_fdt_setprop_sized_cells:
 157  * @fdt: device tree blob
 158  * @node_path: node to set property on
 159  * @property: property to set
 160  * @...: list of number-of-cells, value pairs
 161  *
 162  * Set the specified property on the specified node in the device tree
 163  * to be an array of cells. The values of the cells are specified via
 164  * the variable arguments, which alternates between "number of cells
 165  * used by this value" and "value".
 166  *
 167  * This is a convenience wrapper for the function
 168  * qemu_fdt_setprop_sized_cells_from_array().
 169  *
 170  * Return value: 0 on success, <0 on error.
 171  */
 172 #define qemu_fdt_setprop_sized_cells(fdt, node_path, property, ...)       \
 173     ({                                                                    \
 174         uint64_t qdt_tmp[] = { __VA_ARGS__ };                             \
 175         qemu_fdt_setprop_sized_cells_from_array(fdt, node_path,           \
 176                                                 property,                 \
 177                                                 ARRAY_SIZE(qdt_tmp) / 2,  \
 178                                                 qdt_tmp);                 \
 179     })
 180
 181 #define FDT_PCI_RANGE_RELOCATABLE          0x80000000
 182 #define FDT_PCI_RANGE_PREFETCHABLE         0x40000000
 183 #define FDT_PCI_RANGE_ALIASED              0x20000000
 184 #define FDT_PCI_RANGE_TYPE_MASK            0x03000000
 185 #define FDT_PCI_RANGE_MMIO_64BIT           0x03000000
 186 #define FDT_PCI_RANGE_MMIO                 0x02000000
 187 #define FDT_PCI_RANGE_IOPORT               0x01000000
 188 #define FDT_PCI_RANGE_CONFIG               0x00000000
 189
 190 #endif /* DEVICE_TREE_H */