// SPDX-License-Identifier: GPL-2.0-only/* * Copyright 2006-2007, Michael Ellerman, IBM Corporation. */ #include <linux/irq.h>#include <linux/irqdomain.h>#include <linux/of_irq.h>#include <linux/bitmap.h>#include <linux/msi.h>#include <asm/mpic.h>#include <asm/hw_irq.h>#include <asm/ppc-pci.h>#include <asm/msi_bitmap.h> #include <sysdev/mpic.h> void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq){	/* The mpic calls this even when there is no allocator setup */	if (!mpic->msi_bitmap.bitmap)		return; 	msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);} #ifdef CONFIG_MPIC_U3_HT_IRQSstatic int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic){	irq_hw_number_t hwirq;	const struct irq_domain_ops *ops = mpic->irqhost->ops;	struct device_node *np;	int flags, index, i;	struct of_phandle_args oirq; 	pr_debug("mpic: found U3, guessing msi allocator setup\n"); 	/* Reserve source numbers we know are reserved in the HW.	 *	 * This is a bit of a mix of U3 and U4 reserves but that's going	 * to work fine, we have plenty enough numbers left so let's just	 * mark anything we don't like reserved.	 */	for (i = 0;   i < 8;   i++)		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 	for (i = 42;  i < 46;  i++)		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 	for (i = 100; i < 105; i++)		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 	for (i = 124; i < mpic->num_sources; i++)		msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);  	np = NULL;	while ((np = of_find_all_nodes(np))) {		pr_debug("mpic: mapping hwirqs for %pOF\n", np); 		index = 0;		while (of_irq_parse_one(np, index++, &oirq) == 0) {			ops->xlate(mpic->irqhost, NULL, oirq.args,						oirq.args_count, &hwirq, &flags);			msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);		}	} 	return 0;}#elsestatic int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic){	return -1;}#endif int __init mpic_msi_init_allocator(struct mpic *mpic){	int rc; 	rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources,			      irq_domain_get_of_node(mpic->irqhost));	if (rc)		return rc; 	rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);	if (rc > 0) {		if (mpic->flags & MPIC_U3_HT_IRQS)			rc = mpic_msi_reserve_u3_hwirqs(mpic); 		if (rc) {			msi_bitmap_free(&mpic->msi_bitmap);			return rc;		}	} 	return 0;}