104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
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/*
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* Copyright 2006-2007, Michael Ellerman, IBM Corporation.
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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; version 2 of the
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* License.
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*
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*/
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#include <linux/irq.h>
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#include <linux/bitmap.h>
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#include <linux/msi.h>
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#include <asm/mpic.h>
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#include <asm/prom.h>
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#include <asm/hw_irq.h>
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#include <asm/ppc-pci.h>
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#include <asm/msi_bitmap.h>
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#include <sysdev/mpic.h>
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void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
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{
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/* The mpic calls this even when there is no allocator setup */
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if (!mpic->msi_bitmap.bitmap)
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return;
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
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}
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#ifdef CONFIG_MPIC_U3_HT_IRQS
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static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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{
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irq_hw_number_t hwirq;
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const struct irq_domain_ops *ops = mpic->irqhost->ops;
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struct device_node *np;
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int flags, index, i;
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struct of_phandle_args oirq;
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pr_debug("mpic: found U3, guessing msi allocator setup\n");
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/* Reserve source numbers we know are reserved in the HW.
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*
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* This is a bit of a mix of U3 and U4 reserves but that's going
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* to work fine, we have plenty enugh numbers left so let's just
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* mark anything we don't like reserved.
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*/
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for (i = 0; i < 8; i++)
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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for (i = 42; i < 46; i++)
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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for (i = 100; i < 105; i++)
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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for (i = 124; i < mpic->num_sources; i++)
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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np = NULL;
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while ((np = of_find_all_nodes(np))) {
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pr_debug("mpic: mapping hwirqs for %pOF\n", np);
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index = 0;
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while (of_irq_parse_one(np, index++, &oirq) == 0) {
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ops->xlate(mpic->irqhost, NULL, oirq.args,
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oirq.args_count, &hwirq, &flags);
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
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}
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}
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return 0;
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}
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#else
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static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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{
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return -1;
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}
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#endif
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int mpic_msi_init_allocator(struct mpic *mpic)
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{
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int rc;
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rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources,
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irq_domain_get_of_node(mpic->irqhost));
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if (rc)
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return rc;
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rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
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if (rc > 0) {
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if (mpic->flags & MPIC_U3_HT_IRQS)
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rc = mpic_msi_reserve_u3_hwirqs(mpic);
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if (rc) {
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msi_bitmap_free(&mpic->msi_bitmap);
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return rc;
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}
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}
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return 0;
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}
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