| 1 | |
| 2 | |
| 3 | * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
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| 4 |
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| 5 |
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| 6 | #include <linux/irq.h>
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| 7 | #include <linux/irqdomain.h>
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| 8 | #include <linux/of_irq.h>
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| 9 | #include <linux/bitmap.h>
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| 10 | #include <linux/msi.h>
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| 11 | #include <asm/mpic.h>
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| 12 | #include <asm/hw_irq.h>
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| 13 | #include <asm/ppc-pci.h>
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| 14 | #include <asm/msi_bitmap.h>
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| 15 |
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| 16 | #include <sysdev/mpic.h>
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| 17 |
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| 18 | void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
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| 19 | {
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| 20 |
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| 21 | if (!mpic->msi_bitmap.bitmap)
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| 22 | return;
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| 23 |
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| 24 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
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| 25 | }
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| 26 |
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| 27 | #ifdef CONFIG_MPIC_U3_HT_IRQS
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| 28 | static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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| 29 | {
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| 30 | irq_hw_number_t hwirq;
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| 31 | const struct irq_domain_ops *ops = mpic->irqhost->ops;
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| 32 | struct device_node *np;
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| 33 | int flags, index, i;
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| 34 | struct of_phandle_args oirq;
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| 35 |
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| 36 | pr_debug("mpic: found U3, guessing msi allocator setup\n");
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| 37 |
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| 38 | |
| 39 | *
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| 40 | * This is a bit of a mix of U3 and U4 reserves but that's going
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| 41 | * to work fine, we have plenty enough numbers left so let's just
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| 42 | * mark anything we don't like reserved.
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| 43 |
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| 44 | for (i = 0; i < 8; i++)
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| 45 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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| 46 |
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| 47 | for (i = 42; i < 46; i++)
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| 48 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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| 49 |
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| 50 | for (i = 100; i < 105; i++)
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| 51 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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| 52 |
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| 53 | for (i = 124; i < mpic->num_sources; i++)
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| 54 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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| 55 |
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| 56 |
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| 57 | np = NULL;
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| 58 | while ((np = of_find_all_nodes(np))) {
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| 59 | pr_debug("mpic: mapping hwirqs for %pOF\n", np);
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| 60 |
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| 61 | index = 0;
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| 62 | while (of_irq_parse_one(np, index++, &oirq) == 0) {
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| 63 | ops->xlate(mpic->irqhost, NULL, oirq.args,
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| 64 | oirq.args_count, &hwirq, &flags);
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| 65 | msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | return 0;
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| 70 | }
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| 71 | #else
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| 72 | static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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| 73 | {
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| 74 | return -1;
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| 75 | }
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| 76 | #endif
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| 77 |
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| 78 | int __init mpic_msi_init_allocator(struct mpic *mpic)
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| 79 | {
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| 80 | int rc;
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| 81 |
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| 82 | rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources,
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| 83 | irq_domain_get_of_node(mpic->irqhost));
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| 84 | if (rc)
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| 85 | return rc;
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| 86 |
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| 87 | rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
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| 88 | if (rc > 0) {
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| 89 | if (mpic->flags & MPIC_U3_HT_IRQS)
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| 90 | rc = mpic_msi_reserve_u3_hwirqs(mpic);
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| 91 |
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| 92 | if (rc) {
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| 93 | msi_bitmap_free(&mpic->msi_bitmap);
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| 94 | return rc;
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | return 0;
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| 99 | }
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