of/irq: Refactor interrupt-map parsing
All the users of of_irq_parse_raw pass in a raw interrupt specifier from the device tree and expect it to be returned (possibly modified) in an of_phandle_args structure. However, the primary function of of_irq_parse_raw() is to check for translations due to the presence of one or more interrupt-map properties. The actual placing of the data into an of_phandle_args structure is trivial. If it is refactored to accept an of_phandle_args structure directly, then it becomes possible to consume of_phandle_args from other sources. This is important for an upcoming patch that allows a device to be connected to more than one interrupt parent. It also simplifies the code a bit. The biggest complication with this patch is that the old version works on the interrupt specifiers in __be32 form, but the of_phandle_args structure is intended to carry it in the cpu-native version. A bit of churn was required to make this work. In the end it results in tighter code, so the churn is worth it. Signed-off-by: Grant Likely <grant.likely@linaro.org> Acked-by: Tony Lindgren <tony@atomide.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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e6d30ab1e7
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4 changed files with 67 additions and 59 deletions
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@ -322,7 +322,6 @@ static void hpcd_final_uli5288(struct pci_dev *dev)
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struct pci_controller *hose = pci_bus_to_host(dev->bus);
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struct device_node *hosenode = hose ? hose->dn : NULL;
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struct of_phandle_args oirq;
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int pin = 2;
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u32 laddr[3];
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if (!machine_is(mpc86xx_hpcd))
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@ -331,9 +330,12 @@ static void hpcd_final_uli5288(struct pci_dev *dev)
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if (!hosenode)
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return;
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oirq.np = hosenode;
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oirq.args[0] = 2;
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oirq.args_count = 1;
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laddr[0] = (hose->first_busno << 16) | (PCI_DEVFN(31, 0) << 8);
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laddr[1] = laddr[2] = 0;
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of_irq_parse_raw(hosenode, &pin, 1, laddr, &oirq);
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of_irq_parse_raw(laddr, &oirq);
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dev->irq = irq_create_of_mapping(&oirq);
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}
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108
drivers/of/irq.c
108
drivers/of/irq.c
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@ -80,31 +80,32 @@ struct device_node *of_irq_find_parent(struct device_node *child)
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/**
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* of_irq_parse_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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* @addr: address specifier (start of "reg" property of the device) in be32 format
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* @out_irq: structure of_irq updated 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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* node exist for the parent. It takes an interrupt specifier structure as
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* input, walks the tree looking for any interrupt-map properties, translates
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* the specifier for each map, and then returns the translated map.
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*/
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int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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u32 ointsize, const __be32 *addr, struct of_phandle_args *out_irq)
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int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
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{
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struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
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const __be32 *tmp, *imap, *imask;
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__be32 initial_match_array[8];
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const __be32 *match_array = initial_match_array;
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const __be32 *tmp, *imap, *imask, dummy_imask[] = { ~0, ~0, ~0, ~0, ~0 };
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u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
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int imaplen, match, i;
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pr_debug("of_irq_parse_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
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of_node_full_name(parent), be32_to_cpup(intspec),
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be32_to_cpup(intspec + 1), ointsize);
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of_node_full_name(out_irq->np), out_irq->args[0], out_irq->args[1],
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out_irq->args_count);
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ipar = of_node_get(parent);
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ipar = of_node_get(out_irq->np);
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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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@ -127,7 +128,7 @@ int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize);
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if (ointsize != intsize)
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if (out_irq->args_count != intsize)
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return -EINVAL;
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/* Look for this #address-cells. We have to implement the old linux
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@ -146,6 +147,21 @@ int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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pr_debug(" -> addrsize=%d\n", addrsize);
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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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return -EINVAL;
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}
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/* Precalculate the match array - this simplifies match loop */
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for (i = 0; i < addrsize; i++)
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initial_match_array[i] = addr[i];
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for (i = 0; i < intsize; i++)
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initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]);
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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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@ -154,11 +170,6 @@ int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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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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for (i = 0; i < intsize; i++)
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out_irq->args[i] =
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of_read_number(intspec +i, 1);
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out_irq->args_count = intsize;
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out_irq->np = ipar;
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of_node_put(old);
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return 0;
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}
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@ -175,34 +186,16 @@ int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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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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/* 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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if (!imask)
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imask = dummy_imask;
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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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__be32 mask = imask ? imask[i]
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: cpu_to_be32(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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__be32 mask = imask ? imask[i]
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: cpu_to_be32(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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for (i = 0; i < (addrsize + intsize); i++, imaplen--)
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match = !((match_array[i] ^ *imap++) & imask[i]);
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pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
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@ -247,12 +240,18 @@ int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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if (!match)
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goto fail;
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of_node_put(old);
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old = of_node_get(newpar);
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/*
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* Successfully parsed an interrrupt-map translation; copy new
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* interrupt specifier into the out_irq structure
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*/
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of_node_put(out_irq->np);
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out_irq->np = of_node_get(newpar);
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match_array = imap - newaddrsize - newintsize;
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for (i = 0; i < newintsize; i++)
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out_irq->args[i] = be32_to_cpup(imap - newintsize + i);
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out_irq->args_count = intsize = newintsize;
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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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skiplevel:
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/* Iterate again with new parent */
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@ -263,7 +262,7 @@ int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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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(out_irq->np);
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of_node_put(newpar);
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return -EINVAL;
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@ -276,15 +275,16 @@ EXPORT_SYMBOL_GPL(of_irq_parse_raw);
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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_parse_raw().
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* This function resolves an interrupt for a node by walking the interrupt tree,
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* finding which interrupt controller node it is attached to, and returning the
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* interrupt specifier that can be used to retrieve a Linux IRQ number.
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*/
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int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq)
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{
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struct device_node *p;
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const __be32 *intspec, *tmp, *addr;
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u32 intsize, intlen;
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int res = -EINVAL;
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int i, res = -EINVAL;
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pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index);
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if ((index + 1) * intsize > intlen)
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goto out;
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/* Get new specifier and map it */
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res = of_irq_parse_raw(p, intspec + index * intsize, intsize,
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addr, out_irq);
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/* Copy intspec into irq structure */
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intspec += index * intsize;
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out_irq->np = p;
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out_irq->args_count = intsize;
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for (i = 0; i < intsize; i++)
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out_irq->args[i] = be32_to_cpup(intspec++);
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/* Check if there are any interrupt-map translations to process */
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res = of_irq_parse_raw(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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@ -85,9 +85,12 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq
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pdev = ppdev;
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}
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out_irq->np = ppnode;
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out_irq->args_count = 1;
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out_irq->args[0] = lspec;
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lspec_be = cpu_to_be32(lspec);
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laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8));
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laddr[1] = laddr[2] = cpu_to_be32(0);
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return of_irq_parse_raw(ppnode, &lspec_be, 1, laddr, out_irq);
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laddr[1] = laddr[2] = cpu_to_be32(0);
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return of_irq_parse_raw(laddr, out_irq);
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}
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EXPORT_SYMBOL_GPL(of_irq_parse_pci);
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@ -31,10 +31,7 @@ static inline int of_irq_parse_oldworld(struct device_node *device, int index,
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}
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#endif /* CONFIG_PPC32 && CONFIG_PPC_PMAC */
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extern int of_irq_parse_raw(struct device_node *parent, const __be32 *intspec,
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u32 ointsize, const __be32 *addr,
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struct of_phandle_args *out_irq);
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extern int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq);
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extern int of_irq_parse_one(struct device_node *device, int index,
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struct of_phandle_args *out_irq);
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extern unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data);
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