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![Rob Herring](/assets/img/avatar_default.png)
Convert remaining DT files to use SPDX-License-Identifier tags. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com> Reviewed-by: Frank Rowand <frank.rowand@sony.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Signed-off-by: Rob Herring <robh@kernel.org>
688 lines
19 KiB
C
688 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Derived from arch/i386/kernel/irq.c
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* Copyright (C) 1992 Linus Torvalds
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* Adapted from arch/i386 by Gary Thomas
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Updated and modified by Cort Dougan <cort@fsmlabs.com>
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* Copyright (C) 1996-2001 Cort Dougan
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* Adapted for Power Macintosh by Paul Mackerras
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* Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
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*
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* This file contains the code used to make IRQ descriptions in the
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* device tree to actual irq numbers on an interrupt controller
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* driver.
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*/
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#define pr_fmt(fmt) "OF: " fmt
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_pci.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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/**
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* irq_of_parse_and_map - Parse and map an interrupt into linux virq space
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* @dev: Device node of the device whose interrupt is to be mapped
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* @index: Index of the interrupt to map
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*
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* This function is a wrapper that chains of_irq_parse_one() and
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* irq_create_of_mapping() to make things easier to callers
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*/
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unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
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{
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struct of_phandle_args oirq;
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if (of_irq_parse_one(dev, index, &oirq))
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return 0;
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return irq_create_of_mapping(&oirq);
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}
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EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
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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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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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phandle parent;
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if (!of_node_get(child))
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return NULL;
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do {
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if (of_property_read_u32(child, "interrupt-parent", &parent)) {
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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(parent);
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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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return p;
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}
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EXPORT_SYMBOL_GPL(of_irq_find_parent);
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/**
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* of_irq_parse_raw - Low level interrupt tree parsing
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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_phandle_args 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. 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(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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__be32 initial_match_array[MAX_PHANDLE_ARGS];
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const __be32 *match_array = initial_match_array;
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const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) };
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u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
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int imaplen, match, i, rc = -EINVAL;
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#ifdef DEBUG
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of_print_phandle_args("of_irq_parse_raw: ", out_irq);
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#endif
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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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* is none, we are nice and just walk up the tree
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*/
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do {
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if (!of_property_read_u32(ipar, "#interrupt-cells", &intsize))
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break;
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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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pr_debug("of_irq_parse_raw: ipar=%pOF, size=%d\n", ipar, intsize);
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if (out_irq->args_count != intsize)
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goto fail;
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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 : be32_to_cpu(*tmp);
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pr_debug(" -> addrsize=%d\n", addrsize);
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/* Range check so that the temporary buffer doesn't overflow */
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if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) {
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rc = -EFAULT;
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goto fail;
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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 ? addr[i] : 0;
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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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* then we are done
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*/
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if (of_property_read_bool(ipar, "interrupt-controller")) {
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pr_debug(" -> got it !\n");
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return 0;
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}
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/*
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* interrupt-map parsing does not work without a reg
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* property when #address-cells != 0
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*/
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if (addrsize && !addr) {
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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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/* 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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/* Look for a mask */
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imask = of_get_property(ipar, "interrupt-map-mask", NULL);
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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 + 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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/* 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(be32_to_cpup(imap));
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imap++;
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--imaplen;
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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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if (!of_device_is_available(newpar))
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match = 0;
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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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if (of_property_read_u32(newpar, "#interrupt-cells",
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&newintsize)) {
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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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if (of_property_read_u32(newpar, "#address-cells",
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&newaddrsize))
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newaddrsize = 0;
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pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
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newintsize, newaddrsize);
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/* Check for malformed properties */
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if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS)
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|| (imaplen < (newaddrsize + newintsize))) {
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rc = -EFAULT;
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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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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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* 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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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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skiplevel:
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/* Iterate again with new parent */
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out_irq->np = newpar;
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pr_debug(" -> new parent: %pOF\n", newpar);
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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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rc = -ENOENT; /* No interrupt-map found */
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fail:
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of_node_put(ipar);
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of_node_put(newpar);
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return rc;
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}
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EXPORT_SYMBOL_GPL(of_irq_parse_raw);
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/**
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* of_irq_parse_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 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 *addr;
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u32 intsize;
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int i, res;
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pr_debug("of_irq_parse_one: dev=%pOF, index=%d\n", device, index);
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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_parse_oldworld(device, index, out_irq);
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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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/* Try the new-style interrupts-extended first */
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res = of_parse_phandle_with_args(device, "interrupts-extended",
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"#interrupt-cells", index, out_irq);
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if (!res)
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return of_irq_parse_raw(addr, out_irq);
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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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/* Get size of interrupt specifier */
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if (of_property_read_u32(p, "#interrupt-cells", &intsize)) {
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res = -EINVAL;
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goto out;
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}
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pr_debug(" parent=%pOF, intsize=%d\n", p, intsize);
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/* Copy intspec into irq structure */
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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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res = of_property_read_u32_index(device, "interrupts",
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(index * intsize) + i,
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out_irq->args + i);
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if (res)
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goto out;
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}
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pr_debug(" intspec=%d\n", *out_irq->args);
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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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}
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EXPORT_SYMBOL_GPL(of_irq_parse_one);
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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 = of_irq_get(dev, index);
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if (irq < 0)
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return irq;
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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) {
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const char *name = NULL;
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memset(r, 0, sizeof(*r));
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/*
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* Get optional "interrupt-names" property to add a name
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* to the resource.
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*/
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of_property_read_string_index(dev, "interrupt-names", index,
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&name);
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r->start = r->end = irq;
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r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq));
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r->name = name ? name : of_node_full_name(dev);
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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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/**
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* of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number
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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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*
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* Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or
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* -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
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* of any other failure.
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*/
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int of_irq_get(struct device_node *dev, int index)
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{
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int rc;
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struct of_phandle_args oirq;
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struct irq_domain *domain;
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rc = of_irq_parse_one(dev, index, &oirq);
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if (rc)
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return rc;
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domain = irq_find_host(oirq.np);
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if (!domain)
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return -EPROBE_DEFER;
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return irq_create_of_mapping(&oirq);
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}
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EXPORT_SYMBOL_GPL(of_irq_get);
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/**
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* of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number
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* @dev: pointer to device tree node
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* @name: IRQ name
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*
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* Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or
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* -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
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* of any other failure.
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*/
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int of_irq_get_byname(struct device_node *dev, const char *name)
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{
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int index;
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if (unlikely(!name))
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return -EINVAL;
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index = of_property_match_string(dev, "interrupt-names", name);
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if (index < 0)
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return index;
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return of_irq_get(dev, index);
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}
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EXPORT_SYMBOL_GPL(of_irq_get_byname);
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/**
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* of_irq_count - Count the number of IRQs a node uses
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* @dev: pointer to device tree node
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*/
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int of_irq_count(struct device_node *dev)
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{
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struct of_phandle_args irq;
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int nr = 0;
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while (of_irq_parse_one(dev, nr, &irq) == 0)
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nr++;
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return nr;
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}
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/**
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* of_irq_to_resource_table - Fill in resource table with node's IRQ info
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* @dev: pointer to device tree node
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* @res: array of resources to fill in
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* @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
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*
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* Returns the size of the filled in table (up to @nr_irqs).
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*/
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int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
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int nr_irqs)
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{
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int i;
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for (i = 0; i < nr_irqs; i++, res++)
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if (of_irq_to_resource(dev, i, res) <= 0)
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break;
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return i;
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}
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EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
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struct of_intc_desc {
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struct list_head list;
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of_irq_init_cb_t irq_init_cb;
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struct device_node *dev;
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struct device_node *interrupt_parent;
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};
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/**
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* of_irq_init - Scan and init matching interrupt controllers in DT
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* @matches: 0 terminated array of nodes to match and init function to call
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*
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* This function scans the device tree for matching interrupt controller nodes,
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* and calls their initialization functions in order with parents first.
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*/
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void __init of_irq_init(const struct of_device_id *matches)
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{
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const struct of_device_id *match;
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struct device_node *np, *parent = NULL;
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struct of_intc_desc *desc, *temp_desc;
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struct list_head intc_desc_list, intc_parent_list;
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INIT_LIST_HEAD(&intc_desc_list);
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INIT_LIST_HEAD(&intc_parent_list);
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|
|
for_each_matching_node_and_match(np, matches, &match) {
|
|
if (!of_property_read_bool(np, "interrupt-controller") ||
|
|
!of_device_is_available(np))
|
|
continue;
|
|
|
|
if (WARN(!match->data, "of_irq_init: no init function for %s\n",
|
|
match->compatible))
|
|
continue;
|
|
|
|
/*
|
|
* Here, we allocate and populate an of_intc_desc with the node
|
|
* pointer, interrupt-parent device_node etc.
|
|
*/
|
|
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
|
|
if (WARN_ON(!desc)) {
|
|
of_node_put(np);
|
|
goto err;
|
|
}
|
|
|
|
desc->irq_init_cb = match->data;
|
|
desc->dev = of_node_get(np);
|
|
desc->interrupt_parent = of_irq_find_parent(np);
|
|
if (desc->interrupt_parent == np)
|
|
desc->interrupt_parent = NULL;
|
|
list_add_tail(&desc->list, &intc_desc_list);
|
|
}
|
|
|
|
/*
|
|
* The root irq controller is the one without an interrupt-parent.
|
|
* That one goes first, followed by the controllers that reference it,
|
|
* followed by the ones that reference the 2nd level controllers, etc.
|
|
*/
|
|
while (!list_empty(&intc_desc_list)) {
|
|
/*
|
|
* Process all controllers with the current 'parent'.
|
|
* First pass will be looking for NULL as the parent.
|
|
* The assumption is that NULL parent means a root controller.
|
|
*/
|
|
list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
|
|
int ret;
|
|
|
|
if (desc->interrupt_parent != parent)
|
|
continue;
|
|
|
|
list_del(&desc->list);
|
|
|
|
of_node_set_flag(desc->dev, OF_POPULATED);
|
|
|
|
pr_debug("of_irq_init: init %pOF (%p), parent %p\n",
|
|
desc->dev,
|
|
desc->dev, desc->interrupt_parent);
|
|
ret = desc->irq_init_cb(desc->dev,
|
|
desc->interrupt_parent);
|
|
if (ret) {
|
|
of_node_clear_flag(desc->dev, OF_POPULATED);
|
|
kfree(desc);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* This one is now set up; add it to the parent list so
|
|
* its children can get processed in a subsequent pass.
|
|
*/
|
|
list_add_tail(&desc->list, &intc_parent_list);
|
|
}
|
|
|
|
/* Get the next pending parent that might have children */
|
|
desc = list_first_entry_or_null(&intc_parent_list,
|
|
typeof(*desc), list);
|
|
if (!desc) {
|
|
pr_err("of_irq_init: children remain, but no parents\n");
|
|
break;
|
|
}
|
|
list_del(&desc->list);
|
|
parent = desc->dev;
|
|
kfree(desc);
|
|
}
|
|
|
|
list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) {
|
|
list_del(&desc->list);
|
|
kfree(desc);
|
|
}
|
|
err:
|
|
list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
|
|
list_del(&desc->list);
|
|
of_node_put(desc->dev);
|
|
kfree(desc);
|
|
}
|
|
}
|
|
|
|
static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
|
|
u32 rid_in)
|
|
{
|
|
struct device *parent_dev;
|
|
u32 rid_out = rid_in;
|
|
|
|
/*
|
|
* Walk up the device parent links looking for one with a
|
|
* "msi-map" property.
|
|
*/
|
|
for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent)
|
|
if (!of_pci_map_rid(parent_dev->of_node, rid_in, "msi-map",
|
|
"msi-map-mask", np, &rid_out))
|
|
break;
|
|
return rid_out;
|
|
}
|
|
|
|
/**
|
|
* of_msi_map_rid - Map a MSI requester ID for a device.
|
|
* @dev: device for which the mapping is to be done.
|
|
* @msi_np: device node of the expected msi controller.
|
|
* @rid_in: unmapped MSI requester ID for the device.
|
|
*
|
|
* Walk up the device hierarchy looking for devices with a "msi-map"
|
|
* property. If found, apply the mapping to @rid_in.
|
|
*
|
|
* Returns the mapped MSI requester ID.
|
|
*/
|
|
u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
|
|
{
|
|
return __of_msi_map_rid(dev, &msi_np, rid_in);
|
|
}
|
|
|
|
/**
|
|
* of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain
|
|
* @dev: device for which the mapping is to be done.
|
|
* @rid: Requester ID for the device.
|
|
*
|
|
* Walk up the device hierarchy looking for devices with a "msi-map"
|
|
* property.
|
|
*
|
|
* Returns: the MSI domain for this device (or NULL on failure)
|
|
*/
|
|
struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 rid)
|
|
{
|
|
struct device_node *np = NULL;
|
|
|
|
__of_msi_map_rid(dev, &np, rid);
|
|
return irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
|
|
}
|
|
|
|
/**
|
|
* of_msi_get_domain - Use msi-parent to find the relevant MSI domain
|
|
* @dev: device for which the domain is requested
|
|
* @np: device node for @dev
|
|
* @token: bus type for this domain
|
|
*
|
|
* Parse the msi-parent property (both the simple and the complex
|
|
* versions), and returns the corresponding MSI domain.
|
|
*
|
|
* Returns: the MSI domain for this device (or NULL on failure).
|
|
*/
|
|
struct irq_domain *of_msi_get_domain(struct device *dev,
|
|
struct device_node *np,
|
|
enum irq_domain_bus_token token)
|
|
{
|
|
struct device_node *msi_np;
|
|
struct irq_domain *d;
|
|
|
|
/* Check for a single msi-parent property */
|
|
msi_np = of_parse_phandle(np, "msi-parent", 0);
|
|
if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) {
|
|
d = irq_find_matching_host(msi_np, token);
|
|
if (!d)
|
|
of_node_put(msi_np);
|
|
return d;
|
|
}
|
|
|
|
if (token == DOMAIN_BUS_PLATFORM_MSI) {
|
|
/* Check for the complex msi-parent version */
|
|
struct of_phandle_args args;
|
|
int index = 0;
|
|
|
|
while (!of_parse_phandle_with_args(np, "msi-parent",
|
|
"#msi-cells",
|
|
index, &args)) {
|
|
d = irq_find_matching_host(args.np, token);
|
|
if (d)
|
|
return d;
|
|
|
|
of_node_put(args.np);
|
|
index++;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* of_msi_configure - Set the msi_domain field of a device
|
|
* @dev: device structure to associate with an MSI irq domain
|
|
* @np: device node for that device
|
|
*/
|
|
void of_msi_configure(struct device *dev, struct device_node *np)
|
|
{
|
|
dev_set_msi_domain(dev,
|
|
of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI));
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_msi_configure);
|