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@@ -43,3 +43,304 @@ unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
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oirq.size);
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}
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EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
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+
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+/**
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+ * of_irq_find_parent - Given a device node, find its interrupt parent node
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+ * @child: pointer to device node
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+ *
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+ * Returns a pointer to the interrupt parent node, or NULL if the interrupt
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+ * parent could not be determined.
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+ */
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+static struct device_node *of_irq_find_parent(struct device_node *child)
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+{
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+ struct device_node *p;
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+ const phandle *parp;
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+
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+ if (!of_node_get(child))
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+ return NULL;
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+
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+ do {
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+ parp = of_get_property(child, "interrupt-parent", NULL);
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+ if (parp == NULL)
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+ p = of_get_parent(child);
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+ else {
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+ if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
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+ p = of_node_get(of_irq_dflt_pic);
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+ else
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+ p = of_find_node_by_phandle(*parp);
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+ }
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+ of_node_put(child);
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+ child = p;
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+ } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
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+
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+ return p;
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+}
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+
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+/**
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+ * of_irq_map_raw - Low level interrupt tree parsing
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+ * @parent: the device interrupt parent
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+ * @intspec: interrupt specifier ("interrupts" property of the device)
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+ * @ointsize: size of the passed in interrupt specifier
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+ * @addr: address specifier (start of "reg" property of the device)
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+ * @out_irq: structure of_irq filled by this function
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+ *
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+ * Returns 0 on success and a negative number on error
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+ *
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+ * This function is a low-level interrupt tree walking function. It
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+ * can be used to do a partial walk with synthetized reg and interrupts
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+ * properties, for example when resolving PCI interrupts when no device
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+ * node exist for the parent.
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+ */
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+int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize,
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+ const u32 *addr, struct of_irq *out_irq)
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+{
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+ struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
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+ const u32 *tmp, *imap, *imask;
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+ u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
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+ int imaplen, match, i;
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+
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+ pr_debug("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
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+ parent->full_name, intspec[0], intspec[1], ointsize);
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+
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+ ipar = of_node_get(parent);
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+
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+ /* First get the #interrupt-cells property of the current cursor
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+ * that tells us how to interpret the passed-in intspec. If there
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+ * is none, we are nice and just walk up the tree
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+ */
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+ do {
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+ tmp = of_get_property(ipar, "#interrupt-cells", NULL);
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+ if (tmp != NULL) {
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+ intsize = *tmp;
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+ break;
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+ }
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+ tnode = ipar;
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+ ipar = of_irq_find_parent(ipar);
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+ of_node_put(tnode);
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+ } while (ipar);
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+ if (ipar == NULL) {
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+ pr_debug(" -> no parent found !\n");
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+ goto fail;
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+ }
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+
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+ pr_debug("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
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+
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+ if (ointsize != intsize)
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+ return -EINVAL;
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+
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+ /* Look for this #address-cells. We have to implement the old linux
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+ * trick of looking for the parent here as some device-trees rely on it
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+ */
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+ old = of_node_get(ipar);
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+ do {
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+ tmp = of_get_property(old, "#address-cells", NULL);
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+ tnode = of_get_parent(old);
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+ of_node_put(old);
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+ old = tnode;
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+ } while (old && tmp == NULL);
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+ of_node_put(old);
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+ old = NULL;
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+ addrsize = (tmp == NULL) ? 2 : *tmp;
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+
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+ pr_debug(" -> addrsize=%d\n", addrsize);
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+
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+ /* Now start the actual "proper" walk of the interrupt tree */
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+ while (ipar != NULL) {
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+ /* Now check if cursor is an interrupt-controller and if it is
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+ * then we are done
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+ */
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+ if (of_get_property(ipar, "interrupt-controller", NULL) !=
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+ NULL) {
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+ pr_debug(" -> got it !\n");
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+ memcpy(out_irq->specifier, intspec,
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+ intsize * sizeof(u32));
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+ out_irq->size = intsize;
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+ out_irq->controller = ipar;
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+ of_node_put(old);
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+ return 0;
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+ }
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+
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+ /* Now look for an interrupt-map */
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+ imap = of_get_property(ipar, "interrupt-map", &imaplen);
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+ /* No interrupt map, check for an interrupt parent */
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+ if (imap == NULL) {
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+ pr_debug(" -> no map, getting parent\n");
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+ newpar = of_irq_find_parent(ipar);
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+ goto skiplevel;
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+ }
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+ imaplen /= sizeof(u32);
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+
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+ /* Look for a mask */
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+ imask = of_get_property(ipar, "interrupt-map-mask", NULL);
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+
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+ /* If we were passed no "reg" property and we attempt to parse
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+ * an interrupt-map, then #address-cells must be 0.
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+ * Fail if it's not.
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+ */
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+ if (addr == NULL && addrsize != 0) {
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+ pr_debug(" -> no reg passed in when needed !\n");
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+ goto fail;
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+ }
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+
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+ /* Parse interrupt-map */
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+ match = 0;
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+ while (imaplen > (addrsize + intsize + 1) && !match) {
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+ /* Compare specifiers */
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+ match = 1;
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+ for (i = 0; i < addrsize && match; ++i) {
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+ u32 mask = imask ? imask[i] : 0xffffffffu;
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+ match = ((addr[i] ^ imap[i]) & mask) == 0;
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+ }
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+ for (; i < (addrsize + intsize) && match; ++i) {
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+ u32 mask = imask ? imask[i] : 0xffffffffu;
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+ match =
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+ ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
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+ }
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+ imap += addrsize + intsize;
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+ imaplen -= addrsize + intsize;
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+
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+ pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
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+
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+ /* Get the interrupt parent */
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+ if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
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+ newpar = of_node_get(of_irq_dflt_pic);
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+ else
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+ newpar = of_find_node_by_phandle((phandle)*imap);
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+ imap++;
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+ --imaplen;
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+
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+ /* Check if not found */
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+ if (newpar == NULL) {
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+ pr_debug(" -> imap parent not found !\n");
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+ goto fail;
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+ }
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+
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+ /* Get #interrupt-cells and #address-cells of new
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+ * parent
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+ */
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+ tmp = of_get_property(newpar, "#interrupt-cells", NULL);
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+ if (tmp == NULL) {
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+ pr_debug(" -> parent lacks #interrupt-cells!\n");
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+ goto fail;
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+ }
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+ newintsize = *tmp;
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+ tmp = of_get_property(newpar, "#address-cells", NULL);
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+ newaddrsize = (tmp == NULL) ? 0 : *tmp;
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+
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+ pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
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+ newintsize, newaddrsize);
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+
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+ /* Check for malformed properties */
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+ if (imaplen < (newaddrsize + newintsize))
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+ goto fail;
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+
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+ imap += newaddrsize + newintsize;
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+ imaplen -= newaddrsize + newintsize;
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+
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+ pr_debug(" -> imaplen=%d\n", imaplen);
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+ }
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+ if (!match)
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+ goto fail;
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+
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+ of_node_put(old);
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+ old = of_node_get(newpar);
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+ addrsize = newaddrsize;
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+ intsize = newintsize;
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+ intspec = imap - intsize;
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+ addr = intspec - addrsize;
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+
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+ skiplevel:
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+ /* Iterate again with new parent */
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+ pr_debug(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
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+ of_node_put(ipar);
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+ ipar = newpar;
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+ newpar = NULL;
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+ }
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+ fail:
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+ of_node_put(ipar);
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+ of_node_put(old);
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+ of_node_put(newpar);
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+
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+ return -EINVAL;
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+}
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+EXPORT_SYMBOL_GPL(of_irq_map_raw);
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+
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+/**
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+ * of_irq_map_one - Resolve an interrupt for a device
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+ * @device: the device whose interrupt is to be resolved
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+ * @index: index of the interrupt to resolve
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+ * @out_irq: structure of_irq filled by this function
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+ *
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+ * This function resolves an interrupt, walking the tree, for a given
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+ * device-tree node. It's the high level pendant to of_irq_map_raw().
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+ */
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+int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
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+{
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+ struct device_node *p;
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+ const u32 *intspec, *tmp, *addr;
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+ u32 intsize, intlen;
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+ int res = -EINVAL;
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+
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+ pr_debug("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);
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+
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+ /* OldWorld mac stuff is "special", handle out of line */
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+ if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
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+ return of_irq_map_oldworld(device, index, out_irq);
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+
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+ /* Get the interrupts property */
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+ intspec = of_get_property(device, "interrupts", &intlen);
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+ if (intspec == NULL)
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+ return -EINVAL;
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+ intlen /= sizeof(u32);
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+
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+ pr_debug(" intspec=%d intlen=%d\n", *intspec, intlen);
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+
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+ /* Get the reg property (if any) */
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+ addr = of_get_property(device, "reg", NULL);
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+
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+ /* Look for the interrupt parent. */
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+ p = of_irq_find_parent(device);
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+ if (p == NULL)
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+ return -EINVAL;
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+
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+ /* Get size of interrupt specifier */
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+ tmp = of_get_property(p, "#interrupt-cells", NULL);
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+ if (tmp == NULL)
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+ goto out;
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+ intsize = *tmp;
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+
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+ pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
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+
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+ /* Check index */
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+ if ((index + 1) * intsize > intlen)
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+ goto out;
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+
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+ /* Get new specifier and map it */
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+ res = of_irq_map_raw(p, intspec + index * intsize, intsize,
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+ addr, out_irq);
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+ out:
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+ of_node_put(p);
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+ return res;
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+}
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+EXPORT_SYMBOL_GPL(of_irq_map_one);
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+
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+/**
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+ * of_irq_to_resource - Decode a node's IRQ and return it as a resource
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+ * @dev: pointer to device tree node
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+ * @index: zero-based index of the irq
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+ * @r: pointer to resource structure to return result into.
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+ */
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+int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
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+{
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+ int irq = irq_of_parse_and_map(dev, index);
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+
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+ /* Only dereference the resource if both the
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+ * resource and the irq are valid. */
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+ if (r && irq != NO_IRQ) {
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+ r->start = r->end = irq;
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+ r->flags = IORESOURCE_IRQ;
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+ }
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+
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+ return irq;
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+}
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+EXPORT_SYMBOL_GPL(of_irq_to_resource);
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Grant Likely