122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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* resource.c - barebox resource management
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*
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* Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <errno.h>
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#include <init.h>
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#include <linux/ioport.h>
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static int init_resource(struct resource *res, const char *name)
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{
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INIT_LIST_HEAD(&res->children);
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res->parent = NULL;
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res->name = xstrdup(name);
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return 0;
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}
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/*
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* request a region.
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* This will succedd when the requested region is completely inside
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* the parent resource and does not conflict with any of the child
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* resources.
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*/
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struct resource *request_region(struct resource *parent,
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const char *name, resource_size_t start,
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resource_size_t size)
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{
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struct resource *r, *new;
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/* outside parent resource? */
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if (start < parent->start ||
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start + size > parent->start + parent->size) {
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debug("%s: 0x%08x:0x%08x outside parent resource 0x%08x:0x%08x\n",
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__func__, start, size, parent->start,
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parent->size);
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return NULL;
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}
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/*
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* We keep the list of child resources ordered which helps
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* us searching for conflicts here.
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*/
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list_for_each_entry(r, &parent->children, sibling) {
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if (start + size <= r->start)
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goto ok;
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if (start >= r->start + r->size)
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continue;
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debug("%s: 0x%08x:0x%08x conflicts with 0x%08x:0x%08x\n",
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__func__, start, size, r->start, r->size);
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return NULL;
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}
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ok:
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debug("%s ok: 0x%08x 0x%08x\n", __func__, start, size);
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new = xzalloc(sizeof(*new));
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init_resource(new, name);
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new->start = start;
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new->size = size;
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new->parent = parent;
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list_add_tail(&new->sibling, &r->sibling);
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return new;
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}
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/*
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* release a region previously requested with request_region
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*/
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int release_region(struct resource *res)
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{
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if (!list_empty(&res->children))
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return -EBUSY;
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list_del(&res->sibling);
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free((char *)res->name);
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free(res);
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return 0;
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}
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/* The root resource for the whole io space */
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struct resource iomem_resource = {
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.start = 0,
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.size = ~0,
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};
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/*
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* request a region inside the io space
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*/
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struct resource *request_iomem_region(const char *name,
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resource_size_t start, resource_size_t size)
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{
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return request_region(&iomem_resource, name, start, size);
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}
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static int iomem_init(void)
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{
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init_resource(&iomem_resource, "iomem");
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return 0;
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}
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postcore_initcall(iomem_init);
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