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Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
367 lines
8.3 KiB
C
367 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/irqchip/irq-crossbar.c
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*
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* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
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* Author: Sricharan R <r.sricharan@ti.com>
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/slab.h>
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#define IRQ_FREE -1
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#define IRQ_RESERVED -2
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#define IRQ_SKIP -3
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#define GIC_IRQ_START 32
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/**
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* struct crossbar_device - crossbar device description
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* @lock: spinlock serializing access to @irq_map
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* @int_max: maximum number of supported interrupts
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* @safe_map: safe default value to initialize the crossbar
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* @max_crossbar_sources: Maximum number of crossbar sources
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* @irq_map: array of interrupts to crossbar number mapping
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* @crossbar_base: crossbar base address
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* @register_offsets: offsets for each irq number
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* @write: register write function pointer
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*/
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struct crossbar_device {
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raw_spinlock_t lock;
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uint int_max;
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uint safe_map;
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uint max_crossbar_sources;
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uint *irq_map;
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void __iomem *crossbar_base;
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int *register_offsets;
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void (*write)(int, int);
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};
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static struct crossbar_device *cb;
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static void crossbar_writel(int irq_no, int cb_no)
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{
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writel(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);
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}
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static void crossbar_writew(int irq_no, int cb_no)
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{
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writew(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);
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}
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static void crossbar_writeb(int irq_no, int cb_no)
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{
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writeb(cb_no, cb->crossbar_base + cb->register_offsets[irq_no]);
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}
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static struct irq_chip crossbar_chip = {
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.name = "CBAR",
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.irq_eoi = irq_chip_eoi_parent,
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.irq_mask = irq_chip_mask_parent,
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.irq_unmask = irq_chip_unmask_parent,
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.irq_retrigger = irq_chip_retrigger_hierarchy,
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.irq_set_type = irq_chip_set_type_parent,
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.flags = IRQCHIP_MASK_ON_SUSPEND |
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IRQCHIP_SKIP_SET_WAKE,
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#ifdef CONFIG_SMP
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.irq_set_affinity = irq_chip_set_affinity_parent,
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#endif
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};
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static int allocate_gic_irq(struct irq_domain *domain, unsigned virq,
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irq_hw_number_t hwirq)
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{
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struct irq_fwspec fwspec;
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int i;
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int err;
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if (!irq_domain_get_of_node(domain->parent))
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return -EINVAL;
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raw_spin_lock(&cb->lock);
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for (i = cb->int_max - 1; i >= 0; i--) {
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if (cb->irq_map[i] == IRQ_FREE) {
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cb->irq_map[i] = hwirq;
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break;
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}
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}
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raw_spin_unlock(&cb->lock);
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if (i < 0)
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return -ENODEV;
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fwspec.fwnode = domain->parent->fwnode;
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fwspec.param_count = 3;
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fwspec.param[0] = 0; /* SPI */
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fwspec.param[1] = i;
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fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
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err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
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if (err)
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cb->irq_map[i] = IRQ_FREE;
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else
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cb->write(i, hwirq);
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return err;
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}
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static int crossbar_domain_alloc(struct irq_domain *d, unsigned int virq,
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unsigned int nr_irqs, void *data)
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{
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struct irq_fwspec *fwspec = data;
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irq_hw_number_t hwirq;
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int i;
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if (fwspec->param_count != 3)
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return -EINVAL; /* Not GIC compliant */
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if (fwspec->param[0] != 0)
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return -EINVAL; /* No PPI should point to this domain */
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hwirq = fwspec->param[1];
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if ((hwirq + nr_irqs) > cb->max_crossbar_sources)
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return -EINVAL; /* Can't deal with this */
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for (i = 0; i < nr_irqs; i++) {
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int err = allocate_gic_irq(d, virq + i, hwirq + i);
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if (err)
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return err;
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irq_domain_set_hwirq_and_chip(d, virq + i, hwirq + i,
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&crossbar_chip, NULL);
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}
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return 0;
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}
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/**
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* crossbar_domain_free - unmap/free a crossbar<->irq connection
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* @domain: domain of irq to unmap
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* @virq: virq number
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* @nr_irqs: number of irqs to free
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*
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* We do not maintain a use count of total number of map/unmap
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* calls for a particular irq to find out if a irq can be really
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* unmapped. This is because unmap is called during irq_dispose_mapping(irq),
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* after which irq is anyways unusable. So an explicit map has to be called
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* after that.
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*/
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static void crossbar_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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int i;
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raw_spin_lock(&cb->lock);
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for (i = 0; i < nr_irqs; i++) {
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struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
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irq_domain_reset_irq_data(d);
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cb->irq_map[d->hwirq] = IRQ_FREE;
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cb->write(d->hwirq, cb->safe_map);
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}
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raw_spin_unlock(&cb->lock);
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}
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static int crossbar_domain_translate(struct irq_domain *d,
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struct irq_fwspec *fwspec,
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unsigned long *hwirq,
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unsigned int *type)
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{
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if (is_of_node(fwspec->fwnode)) {
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if (fwspec->param_count != 3)
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return -EINVAL;
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/* No PPI should point to this domain */
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if (fwspec->param[0] != 0)
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return -EINVAL;
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*hwirq = fwspec->param[1];
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*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
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return 0;
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}
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return -EINVAL;
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}
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static const struct irq_domain_ops crossbar_domain_ops = {
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.alloc = crossbar_domain_alloc,
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.free = crossbar_domain_free,
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.translate = crossbar_domain_translate,
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};
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static int __init crossbar_of_init(struct device_node *node)
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{
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u32 max = 0, entry, reg_size;
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int i, size, reserved = 0;
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const __be32 *irqsr;
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int ret = -ENOMEM;
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cb = kzalloc(sizeof(*cb), GFP_KERNEL);
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if (!cb)
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return ret;
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cb->crossbar_base = of_iomap(node, 0);
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if (!cb->crossbar_base)
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goto err_cb;
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of_property_read_u32(node, "ti,max-crossbar-sources",
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&cb->max_crossbar_sources);
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if (!cb->max_crossbar_sources) {
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pr_err("missing 'ti,max-crossbar-sources' property\n");
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ret = -EINVAL;
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goto err_base;
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}
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of_property_read_u32(node, "ti,max-irqs", &max);
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if (!max) {
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pr_err("missing 'ti,max-irqs' property\n");
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ret = -EINVAL;
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goto err_base;
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}
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cb->irq_map = kcalloc(max, sizeof(int), GFP_KERNEL);
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if (!cb->irq_map)
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goto err_base;
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cb->int_max = max;
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for (i = 0; i < max; i++)
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cb->irq_map[i] = IRQ_FREE;
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/* Get and mark reserved irqs */
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irqsr = of_get_property(node, "ti,irqs-reserved", &size);
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if (irqsr) {
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size /= sizeof(__be32);
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for (i = 0; i < size; i++) {
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of_property_read_u32_index(node,
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"ti,irqs-reserved",
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i, &entry);
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if (entry >= max) {
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pr_err("Invalid reserved entry\n");
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ret = -EINVAL;
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goto err_irq_map;
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}
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cb->irq_map[entry] = IRQ_RESERVED;
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}
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}
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/* Skip irqs hardwired to bypass the crossbar */
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irqsr = of_get_property(node, "ti,irqs-skip", &size);
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if (irqsr) {
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size /= sizeof(__be32);
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for (i = 0; i < size; i++) {
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of_property_read_u32_index(node,
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"ti,irqs-skip",
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i, &entry);
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if (entry >= max) {
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pr_err("Invalid skip entry\n");
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ret = -EINVAL;
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goto err_irq_map;
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}
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cb->irq_map[entry] = IRQ_SKIP;
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}
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}
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cb->register_offsets = kcalloc(max, sizeof(int), GFP_KERNEL);
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if (!cb->register_offsets)
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goto err_irq_map;
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of_property_read_u32(node, "ti,reg-size", ®_size);
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switch (reg_size) {
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case 1:
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cb->write = crossbar_writeb;
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break;
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case 2:
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cb->write = crossbar_writew;
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break;
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case 4:
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cb->write = crossbar_writel;
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break;
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default:
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pr_err("Invalid reg-size property\n");
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ret = -EINVAL;
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goto err_reg_offset;
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break;
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}
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/*
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* Register offsets are not linear because of the
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* reserved irqs. so find and store the offsets once.
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*/
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for (i = 0; i < max; i++) {
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if (cb->irq_map[i] == IRQ_RESERVED)
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continue;
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cb->register_offsets[i] = reserved;
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reserved += reg_size;
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}
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of_property_read_u32(node, "ti,irqs-safe-map", &cb->safe_map);
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/* Initialize the crossbar with safe map to start with */
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for (i = 0; i < max; i++) {
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if (cb->irq_map[i] == IRQ_RESERVED ||
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cb->irq_map[i] == IRQ_SKIP)
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continue;
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cb->write(i, cb->safe_map);
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}
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raw_spin_lock_init(&cb->lock);
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return 0;
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err_reg_offset:
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kfree(cb->register_offsets);
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err_irq_map:
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kfree(cb->irq_map);
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err_base:
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iounmap(cb->crossbar_base);
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err_cb:
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kfree(cb);
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cb = NULL;
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return ret;
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}
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static int __init irqcrossbar_init(struct device_node *node,
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struct device_node *parent)
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{
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struct irq_domain *parent_domain, *domain;
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int err;
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if (!parent) {
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pr_err("%pOF: no parent, giving up\n", node);
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return -ENODEV;
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}
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parent_domain = irq_find_host(parent);
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if (!parent_domain) {
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pr_err("%pOF: unable to obtain parent domain\n", node);
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return -ENXIO;
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}
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err = crossbar_of_init(node);
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if (err)
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return err;
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domain = irq_domain_add_hierarchy(parent_domain, 0,
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cb->max_crossbar_sources,
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node, &crossbar_domain_ops,
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NULL);
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if (!domain) {
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pr_err("%pOF: failed to allocated domain\n", node);
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return -ENOMEM;
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}
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return 0;
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}
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IRQCHIP_DECLARE(ti_irqcrossbar, "ti,irq-crossbar", irqcrossbar_init);
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