litmus-rt.git - The LITMUS^RT kernel.

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author	Trond Myklebust <Trond.Myklebust@netapp.com>	2006-07-05 13:19:25 -0400
committer	Trond Myklebust <Trond.Myklebust@netapp.com>	2006-07-05 13:19:25 -0400
commit	72dbac37e3a0acf8e8f07fc65e34e83de83e0b28 (patch)
tree	4f70bea9d6e8098c13a8cc89806a1e569737ad13 /net/tipc/ref.h
parent	4e0641a7ad98fca5646a6be17605bc80f6c4ebde (diff)
parent	01c3b861cd77b28565a2d18c7caa3ce7f938e35c (diff)

Merge branch 'locks'

Diffstat (limited to 'net/tipc/ref.h')

0 files changed, 0 insertions, 0 deletions

/* * Derived from arch/i386/kernel/irq.c * Copyright (C) 1992 Linus Torvalds * Adapted from arch/i386 by Gary Thomas * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * Updated and modified by Cort Dougan <cort@fsmlabs.com> * Copyright (C) 1996-2001 Cort Dougan * Adapted for Power Macintosh by Paul Mackerras * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) * * This program 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. * * This file contains the code used to make IRQ descriptions in the * device tree to actual irq numbers on an interrupt controller * driver. */ #include <linux/errno.h> #include <linux/list.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/string.h> #include <linux/slab.h> /** * irq_of_parse_and_map - Parse and map an interrupt into linux virq space * @dev: Device node of the device whose interrupt is to be mapped * @index: Index of the interrupt to map * * This function is a wrapper that chains of_irq_parse_one() and * irq_create_of_mapping() to make things easier to callers */ unsigned int irq_of_parse_and_map(struct device_node *dev, int index) { struct of_phandle_args oirq; if (of_irq_parse_one(dev, index, &oirq)) return 0; return irq_create_of_mapping(&oirq); } EXPORT_SYMBOL_GPL(irq_of_parse_and_map); /** * of_irq_find_parent - Given a device node, find its interrupt parent node * @child: pointer to device node * * Returns a pointer to the interrupt parent node, or NULL if the interrupt * parent could not be determined. */ struct device_node *of_irq_find_parent(struct device_node *child) { struct device_node *p; const __be32 *parp; if (!of_node_get(child)) return NULL; do { parp = of_get_property(child, "interrupt-parent", NULL); if (parp == NULL) p = of_get_parent(child); else { if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) p = of_node_get(of_irq_dflt_pic); else p = of_find_node_by_phandle(be32_to_cpup(parp)); } of_node_put(child); child = p; } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL); return p; } /** * of_irq_parse_raw - Low level interrupt tree parsing * @parent: the device interrupt parent * @addr: address specifier (start of "reg" property of the device) in be32 format * @out_irq: structure of_irq updated by this function * * Returns 0 on success and a negative number on error * * This function is a low-level interrupt tree walking function. It * can be used to do a partial walk with synthetized reg and interrupts * properties, for example when resolving PCI interrupts when no device * node exist for the parent. It takes an interrupt specifier structure as * input, walks the tree looking for any interrupt-map properties, translates * the specifier for each map, and then returns the translated map. */ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) { struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; __be32 initial_match_array[MAX_PHANDLE_ARGS]; const __be32 *match_array = initial_match_array; const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 }; u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; int imaplen, match, i; #ifdef DEBUG of_print_phandle_args("of_irq_parse_raw: ", out_irq); #endif ipar = of_node_get(out_irq->np); /* First get the #interrupt-cells property of the current cursor * that tells us how to interpret the passed-in intspec. If there * is none, we are nice and just walk up the tree */ do { tmp = of_get_property(ipar, "#interrupt-cells", NULL); if (tmp != NULL) { intsize = be32_to_cpu(*tmp); break; } tnode = ipar; ipar = of_irq_find_parent(ipar); of_node_put(tnode); } while (ipar); if (ipar == NULL) { pr_debug(" -> no parent found !\n"); goto fail; } pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize); if (out_irq->args_count != intsize) return -EINVAL; /* Look for this #address-cells. We have to implement the old linux * trick of looking for the parent here as some device-trees rely on it */ old = of_node_get(ipar); do { tmp = of_get_property(old, "#address-cells", NULL); tnode = of_get_parent(old); of_node_put(old); old = tnode; } while (old && tmp == NULL); of_node_put(old); old = NULL; addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); pr_debug(" -> addrsize=%d\n", addrsize); /* Range check so that the temporary buffer doesn't overflow */ if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) goto fail; /* Precalculate the match array - this simplifies match loop */ for (i = 0; i < addrsize; i++) initial_match_array[i] = addr ? addr[i] : 0; for (i = 0; i < intsize; i++) initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); /* Now start the actual "proper" walk of the interrupt tree */ while (ipar != NULL) { /* Now check if cursor is an interrupt-controller and if it is * then we are done */ if (of_get_property(ipar, "interrupt-controller", NULL) != NULL) { pr_debug(" -> got it !\n"); return 0; } /* * interrupt-map parsing does not work without a reg * property when #address-cells != 0 */ if (addrsize && !addr) { pr_debug(" -> no reg passed in when needed !\n"); goto fail; } /* Now look for an interrupt-map */ imap = of_get_property(ipar, "interrupt-map", &imaplen); /* No interrupt map, check for an interrupt parent */ if (imap == NULL) { pr_debug(" -> no map, getting parent\n"); newpar = of_irq_find_parent(ipar); goto skiplevel; } imaplen /= sizeof(u32); /* Look for a mask */ imask = of_get_property(ipar, "interrupt-map-mask", NULL); if (!imask) imask = dummy_imask; /* Parse interrupt-map */ match = 0; while (imaplen > (addrsize + intsize + 1) && !match) { /* Compare specifiers */ match = 1; for (i = 0; i < (addrsize + intsize); i++, imaplen--) match &= !((match_array[i] ^ *imap++) & imask[i]); pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); /* Get the interrupt parent */ if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) newpar = of_node_get(of_irq_dflt_pic); else newpar = of_find_node_by_phandle(be32_to_cpup(imap)); imap++; --imaplen; /* Check if not found */ if (newpar == NULL) { pr_debug(" -> imap parent not found !\n"); goto fail; } if (!of_device_is_available(newpar)) match = 0; /* Get #interrupt-cells and #address-cells of new * parent */ tmp = of_get_property(newpar, "#interrupt-cells", NULL); if (tmp == NULL) { pr_debug(" -> parent lacks #interrupt-cells!\n"); goto fail; } newintsize = be32_to_cpu(*tmp); tmp = of_get_property(newpar, "#address-cells", NULL); newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp); pr_debug(" -> newintsize=%d, newaddrsize=%d\n", newintsize, newaddrsize); /* Check for malformed properties */ if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS)) goto fail; if (imaplen < (newaddrsize + newintsize)) goto fail; imap += newaddrsize + newintsize; imaplen -= newaddrsize + newintsize; pr_debug(" -> imaplen=%d\n", imaplen); } if (!match) goto fail; /* * Successfully parsed an interrrupt-map translation; copy new * interrupt specifier into the out_irq structure */ out_irq->np = newpar; match_array = imap - newaddrsize - newintsize; for (i = 0; i < newintsize; i++) out_irq->args[i] = be32_to_cpup(imap - newintsize + i); out_irq->args_count = intsize = newintsize; addrsize = newaddrsize; skiplevel: /* Iterate again with new parent */ pr_debug(" -> new parent: %s\n", of_node_full_name(newpar)); of_node_put(ipar); ipar = newpar; newpar = NULL; } fail: of_node_put(ipar); of_node_put(newpar); return -EINVAL; } EXPORT_SYMBOL_GPL(of_irq_parse_raw); /** * of_irq_parse_one - Resolve an interrupt for a device * @device: the device whose interrupt is to be resolved * @index: index of the interrupt to resolve * @out_irq: structure of_irq filled by this function * * This function resolves an interrupt for a node by walking the interrupt tree, * finding which interrupt controller node it is attached to, and returning the * interrupt specifier that can be used to retrieve a Linux IRQ number. */ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) { struct device_node *p; const __be32 *intspec, *tmp, *addr; u32 intsize, intlen; int i, res = -EINVAL; pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index); /* OldWorld mac stuff is "special", handle out of line */ if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) return of_irq_parse_oldworld(device, index, out_irq); /* Get the reg property (if any) */ addr = of_get_property(device, "reg", NULL); /* Get the interrupts property */ intspec = of_get_property(device, "interrupts", &intlen); if (intspec == NULL) { /* Try the new-style interrupts-extended */ res = of_parse_phandle_with_args(device, "interrupts-extended", "#interrupt-cells", index, out_irq); if (res) return -EINVAL; return of_irq_parse_raw(addr, out_irq); } intlen /= sizeof(*intspec); pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen); /* Look for the interrupt parent. */ p = of_irq_find_parent(device); if (p == NULL) return -EINVAL; /* Get size of interrupt specifier */ tmp = of_get_property(p, "#interrupt-cells", NULL); if (tmp == NULL) goto out; intsize = be32_to_cpu(*tmp); pr_debug(" intsize=%d intlen=%d\n", intsize, intlen); /* Check index */ if ((index + 1) * intsize > intlen) goto out; /* Copy intspec into irq structure */ intspec += index * intsize; out_irq->np = p; out_irq->args_count = intsize; for (i = 0; i < intsize; i++) out_irq->args[i] = be32_to_cpup(intspec++); /* Check if there are any interrupt-map translations to process */ res = of_irq_parse_raw(addr, out_irq); out: of_node_put(p); return res; } EXPORT_SYMBOL_GPL(of_irq_parse_one); /** * of_irq_to_resource - Decode a node's IRQ and return it as a resource * @dev: pointer to device tree node * @index: zero-based index of the irq * @r: pointer to resource structure to return result into. */ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) { int irq = irq_of_parse_and_map(dev, index); /* Only dereference the resource if both the * resource and the irq are valid. */ if (r && irq) { const char *name = NULL; memset(r, 0, sizeof(*r)); /* * Get optional "interrupts-names" property to add a name * to the resource. */ of_property_read_string_index(dev, "interrupt-names", index, &name); r->start = r->end = irq; r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); r->name = name ? name : of_node_full_name(dev); } return irq; } EXPORT_SYMBOL_GPL(of_irq_to_resource); /** * of_irq_count - Count the number of IRQs a node uses * @dev: pointer to device tree node */ int of_irq_count(struct device_node *dev) { struct of_phandle_args irq; int nr = 0; while (of_irq_parse_one(dev, nr, &irq) == 0) nr++; return nr; } /** * of_irq_to_resource_table - Fill in resource table with node's IRQ info * @dev: pointer to device tree node * @res: array of resources to fill in * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) * * Returns the size of the filled in table (up to @nr_irqs). */ int of_irq_to_resource_table(struct device_node *dev, struct resource *res, int nr_irqs) { int i; for (i = 0; i < nr_irqs; i++, res++) if (!of_irq_to_resource(dev, i, res)) break; return i; } EXPORT_SYMBOL_GPL(of_irq_to_resource_table); struct intc_desc { struct list_head list; struct device_node *dev; struct device_node *interrupt_parent; }; /** * of_irq_init - Scan and init matching interrupt controllers in DT * @matches: 0 terminated array of nodes to match and init function to call *


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