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97 lines
2.4 KiB
97 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/string.h> |
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#include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <asm/prom.h> |
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#include "of_helpers.h" |
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/** |
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* pseries_of_derive_parent - basically like dirname(1) |
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* @path: the full_name of a node to be added to the tree |
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* |
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* Returns the node which should be the parent of the node |
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* described by path. E.g., for path = "/foo/bar", returns |
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* the node with full_name = "/foo". |
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*/ |
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struct device_node *pseries_of_derive_parent(const char *path) |
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{ |
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struct device_node *parent; |
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char *parent_path = "/"; |
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const char *tail; |
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/* We do not want the trailing '/' character */ |
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tail = kbasename(path) - 1; |
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/* reject if path is "/" */ |
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if (!strcmp(path, "/")) |
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return ERR_PTR(-EINVAL); |
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if (tail > path) { |
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parent_path = kstrndup(path, tail - path, GFP_KERNEL); |
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if (!parent_path) |
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return ERR_PTR(-ENOMEM); |
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} |
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parent = of_find_node_by_path(parent_path); |
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if (strcmp(parent_path, "/")) |
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kfree(parent_path); |
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return parent ? parent : ERR_PTR(-EINVAL); |
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} |
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/* Helper Routines to convert between drc_index to cpu numbers */ |
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int of_read_drc_info_cell(struct property **prop, const __be32 **curval, |
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struct of_drc_info *data) |
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{ |
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const char *p = (char *)(*curval); |
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const __be32 *p2; |
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if (!data) |
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return -EINVAL; |
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/* Get drc-type:encode-string */ |
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data->drc_type = (char *)p; |
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p = of_prop_next_string(*prop, p); |
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if (!p) |
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return -EINVAL; |
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/* Get drc-name-prefix:encode-string */ |
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data->drc_name_prefix = (char *)p; |
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p = of_prop_next_string(*prop, p); |
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if (!p) |
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return -EINVAL; |
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/* Get drc-index-start:encode-int */ |
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p2 = (const __be32 *)p; |
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data->drc_index_start = be32_to_cpu(*p2); |
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/* Get drc-name-suffix-start:encode-int */ |
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p2 = of_prop_next_u32(*prop, p2, &data->drc_name_suffix_start); |
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if (!p2) |
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return -EINVAL; |
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/* Get number-sequential-elements:encode-int */ |
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p2 = of_prop_next_u32(*prop, p2, &data->num_sequential_elems); |
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if (!p2) |
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return -EINVAL; |
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/* Get sequential-increment:encode-int */ |
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p2 = of_prop_next_u32(*prop, p2, &data->sequential_inc); |
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if (!p2) |
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return -EINVAL; |
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/* Get drc-power-domain:encode-int */ |
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p2 = of_prop_next_u32(*prop, p2, &data->drc_power_domain); |
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if (!p2) |
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return -EINVAL; |
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/* Should now know end of current entry */ |
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(*curval) = (void *)(++p2); |
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data->last_drc_index = data->drc_index_start + |
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((data->num_sequential_elems - 1) * data->sequential_inc); |
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return 0; |
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} |
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EXPORT_SYMBOL(of_read_drc_info_cell);
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