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Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/devtree.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/devtree.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/devtree.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/devtree.c new file mode 100644 index 000000000..1f824d2f1 --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/devtree.c @@ -0,0 +1,173 @@ +/* + * arch/ubicom32/kernel/devtree.c + * Ubicom32 architecture device tree implementation. + * + * (C) Copyright 2009, Ubicom, Inc. + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <asm/devtree.h> + +/* + * The device tree. + */ +struct devtree_node *devtree; + +/* + * devtree_print() + * Print the device tree. + */ +void devtree_print(void) +{ + struct devtree_node *p = devtree; + printk(KERN_INFO "Device Tree:\n"); + while (p) { + if (p->magic != DEVTREE_NODE_MAGIC) { + printk(KERN_EMERG + "device tree has improper node: %p\n", p); + return; + } + printk(KERN_INFO "\t%p: sendirq=%03d, recvirq=%03d, " + " name=%s\n", p, p->sendirq, p->recvirq, p->name); + p = p->next; + } +} +EXPORT_SYMBOL(devtree_print); + +/* + * devtree_irq() + * Return the IRQ(s) associated with devtree node. + */ +int devtree_irq(struct devtree_node *dn, + unsigned char *sendirq, + unsigned char *recvirq) +{ + if (dn->magic != DEVTREE_NODE_MAGIC) { + printk(KERN_EMERG "improper node: %p\n", dn); + if (sendirq) { + *sendirq = DEVTREE_IRQ_NONE; + } + if (recvirq) { + *recvirq = DEVTREE_IRQ_NONE; + } + return -EFAULT; + } + + /* + * Copy the devtree irq(s) to the output parameters. + */ + if (sendirq) { + *sendirq = dn->sendirq; + } + if (recvirq) { + *recvirq = dn->recvirq; + } + return 0; +} +EXPORT_SYMBOL(devtree_irq); + +/* + * devtree_find_next() + * Provide an iterator for walking the device tree. + */ +struct devtree_node *devtree_find_next(struct devtree_node **cur) +{ + struct devtree_node *p = *cur; + if (!p) { + *cur = devtree; + return devtree; + } + p = p->next; + *cur = p; + return p; +} + +/* + * devtree_find_by_irq() + * Return the node associated with a given irq. + */ +struct devtree_node *devtree_find_by_irq(uint8_t sendirq, uint8_t recvirq) +{ + struct devtree_node *p = devtree; + + if (sendirq == recvirq) { + printk(KERN_EMERG "identical request makes no sense sendirq = " + "%d, recvirq= %d\n", sendirq, recvirq); + return NULL; + } + + while (p) { + if (p->magic != DEVTREE_NODE_MAGIC) { + printk(KERN_EMERG + "device tree has improper node: %p\n", p); + return NULL; + } + + /* + * See if we can find a match on the IRQ(s) specified. + */ + if ((sendirq == p->sendirq) && (recvirq == p->recvirq)) { + return p; + } + + if ((sendirq == DEVTREE_IRQ_DONTCARE) && + (p->recvirq == recvirq)) { + return p; + } + + if ((recvirq == DEVTREE_IRQ_DONTCARE) && + (p->sendirq == sendirq)) { + return p; + } + + p = p->next; + } + return NULL; +} +EXPORT_SYMBOL(devtree_find_by_irq); + +/* + * devtree_find_node() + * Find a node in the device tree by name. + */ +struct devtree_node *devtree_find_node(const char *str) +{ + struct devtree_node *p = devtree; + while (p) { + if (p->magic != DEVTREE_NODE_MAGIC) { + printk(KERN_EMERG + "device tree has improper node: %p\n", p); + return NULL; + } + if (strcmp(p->name, str) == 0) { + return p; + } + p = p->next; + } + return NULL; +} +EXPORT_SYMBOL(devtree_find_node); |