1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2006-2007, Michael Ellerman, IBM Corporation. 4 */ 5 6 #include <linux/irq.h> 7 #include <linux/bitmap.h> 8 #include <linux/msi.h> 9 #include <asm/mpic.h> 10 #include <asm/prom.h> 11 #include <asm/hw_irq.h> 12 #include <asm/ppc-pci.h> 13 #include <asm/msi_bitmap.h> 14 15 #include <sysdev/mpic.h> 16 17 void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq) 18 { 19 /* The mpic calls this even when there is no allocator setup */ 20 if (!mpic->msi_bitmap.bitmap) 21 return; 22 23 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); 24 } 25 26 #ifdef CONFIG_MPIC_U3_HT_IRQS 27 static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) 28 { 29 irq_hw_number_t hwirq; 30 const struct irq_domain_ops *ops = mpic->irqhost->ops; 31 struct device_node *np; 32 int flags, index, i; 33 struct of_phandle_args oirq; 34 35 pr_debug("mpic: found U3, guessing msi allocator setup\n"); 36 37 /* Reserve source numbers we know are reserved in the HW. 38 * 39 * This is a bit of a mix of U3 and U4 reserves but that's going 40 * to work fine, we have plenty enugh numbers left so let's just 41 * mark anything we don't like reserved. 42 */ 43 for (i = 0; i < 8; i++) 44 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 45 46 for (i = 42; i < 46; i++) 47 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 48 49 for (i = 100; i < 105; i++) 50 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 51 52 for (i = 124; i < mpic->num_sources; i++) 53 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); 54 55 56 np = NULL; 57 while ((np = of_find_all_nodes(np))) { 58 pr_debug("mpic: mapping hwirqs for %pOF\n", np); 59 60 index = 0; 61 while (of_irq_parse_one(np, index++, &oirq) == 0) { 62 ops->xlate(mpic->irqhost, NULL, oirq.args, 63 oirq.args_count, &hwirq, &flags); 64 msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); 65 } 66 } 67 68 return 0; 69 } 70 #else 71 static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) 72 { 73 return -1; 74 } 75 #endif 76 77 int mpic_msi_init_allocator(struct mpic *mpic) 78 { 79 int rc; 80 81 rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources, 82 irq_domain_get_of_node(mpic->irqhost)); 83 if (rc) 84 return rc; 85 86 rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap); 87 if (rc > 0) { 88 if (mpic->flags & MPIC_U3_HT_IRQS) 89 rc = mpic_msi_reserve_u3_hwirqs(mpic); 90 91 if (rc) { 92 msi_bitmap_free(&mpic->msi_bitmap); 93 return rc; 94 } 95 } 96 97 return 0; 98 } 99