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path: root/drivers/of/irq.c
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Diffstat (limited to 'drivers/of/irq.c')
-rw-r--r--drivers/of/irq.c164
1 files changed, 91 insertions, 73 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 1752988d6aa8..786b0b47fae4 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -31,18 +31,17 @@
* @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_map_one() and
+ * 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_irq oirq;
+ struct of_phandle_args oirq;
- if (of_irq_map_one(dev, index, &oirq))
+ if (of_irq_parse_one(dev, index, &oirq))
return 0;
- return irq_create_of_mapping(oirq.controller, oirq.specifier,
- oirq.size);
+ return irq_create_of_mapping(&oirq);
}
EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
@@ -79,33 +78,34 @@ struct device_node *of_irq_find_parent(struct device_node *child)
}
/**
- * of_irq_map_raw - Low level interrupt tree parsing
+ * of_irq_parse_raw - Low level interrupt tree parsing
* @parent: the device interrupt parent
- * @intspec: interrupt specifier ("interrupts" property of the device)
- * @ointsize: size of the passed in interrupt specifier
- * @addr: address specifier (start of "reg" property of the device)
- * @out_irq: structure of_irq filled by this function
+ * @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.
+ * 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_map_raw(struct device_node *parent, const __be32 *intspec,
- u32 ointsize, const __be32 *addr, struct of_irq *out_irq)
+int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
{
struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
- const __be32 *tmp, *imap, *imask;
+ __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;
- pr_debug("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
- parent->full_name, be32_to_cpup(intspec),
- be32_to_cpup(intspec + 1), ointsize);
+#ifdef DEBUG
+ of_print_phandle_args("of_irq_parse_raw: ", out_irq);
+#endif
- ipar = of_node_get(parent);
+ 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
@@ -126,9 +126,9 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
goto fail;
}
- pr_debug("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
+ pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize);
- if (ointsize != intsize)
+ if (out_irq->args_count != intsize)
return -EINVAL;
/* Look for this #address-cells. We have to implement the old linux
@@ -147,6 +147,16 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
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
@@ -155,15 +165,19 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
if (of_get_property(ipar, "interrupt-controller", NULL) !=
NULL) {
pr_debug(" -> got it !\n");
- for (i = 0; i < intsize; i++)
- out_irq->specifier[i] =
- of_read_number(intspec +i, 1);
- out_irq->size = intsize;
- out_irq->controller = ipar;
of_node_put(old);
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 */
@@ -176,34 +190,16 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
/* Look for a mask */
imask = of_get_property(ipar, "interrupt-map-mask", NULL);
-
- /* If we were passed no "reg" property and we attempt to parse
- * an interrupt-map, then #address-cells must be 0.
- * Fail if it's not.
- */
- if (addr == NULL && addrsize != 0) {
- pr_debug(" -> no reg passed in when needed !\n");
- goto fail;
- }
+ 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 && match; ++i) {
- __be32 mask = imask ? imask[i]
- : cpu_to_be32(0xffffffffu);
- match = ((addr[i] ^ imap[i]) & mask) == 0;
- }
- for (; i < (addrsize + intsize) && match; ++i) {
- __be32 mask = imask ? imask[i]
- : cpu_to_be32(0xffffffffu);
- match =
- ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
- }
- imap += addrsize + intsize;
- imaplen -= addrsize + intsize;
+ for (i = 0; i < (addrsize + intsize); i++, imaplen--)
+ match &= !((match_array[i] ^ *imap++) & imask[i]);
pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
@@ -237,6 +233,8 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
newintsize, newaddrsize);
/* Check for malformed properties */
+ if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS))
+ goto fail;
if (imaplen < (newaddrsize + newintsize))
goto fail;
@@ -248,12 +246,18 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
if (!match)
goto fail;
- of_node_put(old);
- old = of_node_get(newpar);
+ /*
+ * Successfully parsed an interrrupt-map translation; copy new
+ * interrupt specifier into the out_irq structure
+ */
+ of_node_put(out_irq->np);
+ out_irq->np = of_node_get(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;
- intsize = newintsize;
- intspec = imap - intsize;
- addr = intspec - addrsize;
skiplevel:
/* Iterate again with new parent */
@@ -264,46 +268,53 @@ int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
}
fail:
of_node_put(ipar);
- of_node_put(old);
+ of_node_put(out_irq->np);
of_node_put(newpar);
return -EINVAL;
}
-EXPORT_SYMBOL_GPL(of_irq_map_raw);
+EXPORT_SYMBOL_GPL(of_irq_parse_raw);
/**
- * of_irq_map_one - Resolve an interrupt for a device
+ * 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, walking the tree, for a given
- * device-tree node. It's the high level pendant to of_irq_map_raw().
+ * 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_map_one(struct device_node *device, int index, struct of_irq *out_irq)
+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 res = -EINVAL;
+ int i, res = -EINVAL;
- pr_debug("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);
+ 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_map_oldworld(device, index, out_irq);
+ 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)
- return -EINVAL;
+ 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);
- /* Get the reg property (if any) */
- addr = of_get_property(device, "reg", NULL);
-
/* Look for the interrupt parent. */
p = of_irq_find_parent(device);
if (p == NULL)
@@ -321,14 +332,20 @@ int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq
if ((index + 1) * intsize > intlen)
goto out;
- /* Get new specifier and map it */
- res = of_irq_map_raw(p, intspec + index * intsize, intsize,
- addr, out_irq);
+ /* 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_map_one);
+EXPORT_SYMBOL_GPL(of_irq_parse_one);
/**
* of_irq_to_resource - Decode a node's IRQ and return it as a resource
@@ -354,8 +371,8 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
&name);
r->start = r->end = irq;
- r->flags = IORESOURCE_IRQ;
- r->name = name ? name : dev->full_name;
+ r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq));
+ r->name = name ? name : of_node_full_name(dev);
}
return irq;
@@ -368,9 +385,10 @@ EXPORT_SYMBOL_GPL(of_irq_to_resource);
*/
int of_irq_count(struct device_node *dev)
{
+ struct of_phandle_args irq;
int nr = 0;
- while (of_irq_to_resource(dev, nr, NULL))
+ while (of_irq_parse_one(dev, nr, &irq) == 0)
nr++;
return nr;