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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ad69674e73
The commit 9ec36cafe4
"of/irq: do irq resolution in platform_get_irq" from Rob Herring -
moves resolving of the interrupt resources in platform_get_irq().
But this solution isn't complete because platform_get_irq_byname()
need to be modified the same way.
Hence, fix it by adding interrupt resolution code at the
platform_get_irq_byname() function too.
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Rob Herring <robh@kernel.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
574 lines
16 KiB
C
574 lines
16 KiB
C
/*
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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 program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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#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/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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const __be32 *parp;
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if (!of_node_get(child))
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return NULL;
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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(be32_to_cpup(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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return p;
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}
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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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* @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. 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] = ~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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#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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tmp = of_get_property(ipar, "#interrupt-cells", NULL);
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if (tmp != NULL) {
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intsize = be32_to_cpu(*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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pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), 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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* 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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goto fail;
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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_get_property(ipar, "interrupt-controller", NULL) !=
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NULL) {
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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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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 = be32_to_cpu(*tmp);
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tmp = of_get_property(newpar, "#address-cells", NULL);
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newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
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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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goto fail;
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if (imaplen < (newaddrsize + newintsize))
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goto fail;
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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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out_irq->np = 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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skiplevel:
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/* Iterate again with new parent */
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pr_debug(" -> new parent: %s\n", of_node_full_name(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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fail:
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of_node_put(ipar);
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of_node_put(newpar);
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return -EINVAL;
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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 *intspec, *tmp, *addr;
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u32 intsize, intlen;
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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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/* 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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/* 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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/* Try the new-style interrupts-extended */
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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 -EINVAL;
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return of_irq_parse_raw(addr, out_irq);
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}
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intlen /= sizeof(*intspec);
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pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);
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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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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 = be32_to_cpu(*tmp);
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pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
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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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/* 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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}
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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 = irq_of_parse_and_map(dev, index);
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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 -EPROBE_DEFER if the irq domain
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* is not yet created.
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*
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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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/**
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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 -EPROBE_DEFER if the irq domain
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* is not yet created, or error code in case 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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/**
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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))
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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 intc_desc {
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struct list_head list;
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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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struct device_node *np, *parent = NULL;
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struct intc_desc *desc, *temp_desc;
|
|
struct list_head intc_desc_list, intc_parent_list;
|
|
|
|
INIT_LIST_HEAD(&intc_desc_list);
|
|
INIT_LIST_HEAD(&intc_parent_list);
|
|
|
|
for_each_matching_node(np, matches) {
|
|
if (!of_find_property(np, "interrupt-controller", NULL) ||
|
|
!of_device_is_available(np))
|
|
continue;
|
|
/*
|
|
* Here, we allocate and populate an intc_desc with the node
|
|
* pointer, interrupt-parent device_node etc.
|
|
*/
|
|
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
|
|
if (WARN_ON(!desc))
|
|
goto err;
|
|
|
|
desc->dev = 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) {
|
|
const struct of_device_id *match;
|
|
int ret;
|
|
of_irq_init_cb_t irq_init_cb;
|
|
|
|
if (desc->interrupt_parent != parent)
|
|
continue;
|
|
|
|
list_del(&desc->list);
|
|
match = of_match_node(matches, desc->dev);
|
|
if (WARN(!match->data,
|
|
"of_irq_init: no init function for %s\n",
|
|
match->compatible)) {
|
|
kfree(desc);
|
|
continue;
|
|
}
|
|
|
|
pr_debug("of_irq_init: init %s @ %p, parent %p\n",
|
|
match->compatible,
|
|
desc->dev, desc->interrupt_parent);
|
|
irq_init_cb = (of_irq_init_cb_t)match->data;
|
|
ret = irq_init_cb(desc->dev, desc->interrupt_parent);
|
|
if (ret) {
|
|
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);
|
|
kfree(desc);
|
|
}
|
|
}
|