/* * Copyright 2007, Olof Johansson, PA Semi * * Based on arch/powerpc/sysdev/mpic_u3msi.c: * * Copyright 2006, Segher Boessenkool, IBM Corporation. * Copyright 2006-2007, Michael Ellerman, IBM Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; version 2 of the * License. * */ #undef DEBUG #include <linux/irq.h> #include <linux/bootmem.h> #include <linux/msi.h> #include <asm/mpic.h> #include <asm/prom.h> #include <asm/hw_irq.h> #include <asm/ppc-pci.h> #include <asm/msi_bitmap.h> #include "mpic.h" /* Allocate 16 interrupts per device, to give an alignment of 16, * since that's the size of the grouping w.r.t. affinity. If someone * needs more than 32 MSI's down the road we'll have to rethink this, * but it should be OK for now. */ #define ALLOC_CHUNK 16 #define PASEMI_MSI_ADDR 0xfc080000 /* A bit ugly, can we get this from the pci_dev somehow? */ static struct mpic *msi_mpic; static void mpic_pasemi_msi_mask_irq(unsigned int irq) { pr_debug("mpic_pasemi_msi_mask_irq %d\n", irq); mask_msi_irq(irq); mpic_mask_irq(irq); } static void mpic_pasemi_msi_unmask_irq(unsigned int irq) { pr_debug("mpic_pasemi_msi_unmask_irq %d\n", irq); mpic_unmask_irq(irq); unmask_msi_irq(irq); } static struct irq_chip mpic_pasemi_msi_chip = { .shutdown = mpic_pasemi_msi_mask_irq, .mask = mpic_pasemi_msi_mask_irq, .unmask = mpic_pasemi_msi_unmask_irq, .eoi = mpic_end_irq, .set_type = mpic_set_irq_type, .set_affinity = mpic_set_affinity, .typename = "PASEMI-MSI ", }; static int pasemi_msi_check_device(struct pci_dev *pdev, int nvec, int type) { if (type == PCI_CAP_ID_MSIX) pr_debug("pasemi_msi: MSI-X untested, trying anyway\n"); return 0; } static void pasemi_msi_teardown_msi_irqs(struct pci_dev *pdev) { struct msi_desc *entry; pr_debug("pasemi_msi_teardown_msi_irqs, pdev %p\n", pdev); list_for_each_entry(entry, &pdev->msi_list, list) { if (entry->irq == NO_IRQ) continue; set_irq_msi(entry->irq, NULL); msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, virq_to_hw(entry->irq), ALLOC_CHUNK); irq_dispose_mapping(entry->irq); } return; } static int pasemi_msi_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) { unsigned int virq; struct msi_desc *entry; struct msi_msg msg; int hwirq; pr_debug("pasemi_msi_setup_msi_irqs, pdev %p nvec %d type %d\n", pdev, nvec, type); msg.address_hi = 0; msg.address_lo = PASEMI_MSI_ADDR; list_for_each_entry(entry, &pdev->msi_list, list) { /* Allocate 16 interrupts for now, since that's the grouping for * affinity. This can be changed later if it turns out 32 is too * few MSIs for someone, but restrictions will apply to how the * sources can be changed independently. */ hwirq = msi_bitmap_alloc_hwirqs(&msi_mpic->msi_bitmap, ALLOC_CHUNK); if (hwirq < 0) { pr_debug("pasemi_msi: failed allocating hwirq\n"); return hwirq; } virq = irq_create_mapping(msi_mpic->irqhost, hwirq); if (virq == NO_IRQ) { pr_debug("pasemi_msi: failed mapping hwirq 0x%x\n", hwirq); msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq, ALLOC_CHUNK); return -ENOSPC; } /* Vector on MSI is really an offset, the hardware adds * it to the value written at the magic address. So set * it to 0 to remain sane. */ mpic_set_vector(virq, 0); set_irq_msi(virq, entry); set_irq_chip(virq, &mpic_pasemi_msi_chip); set_irq_type(virq, IRQ_TYPE_EDGE_RISING); pr_debug("pasemi_msi: allocated virq 0x%x (hw 0x%x) " \ "addr 0x%x\n", virq, hwirq, msg.address_lo); /* Likewise, the device writes [0...511] into the target * register to generate MSI [512...1023] */ msg.data = hwirq-0x200; write_msi_msg(virq, &msg); } return 0; } int mpic_pasemi_msi_init(struct mpic *mpic) { int rc; if (!mpic->irqhost->of_node || !of_device_is_compatible(mpic->irqhost->of_node, "pasemi,pwrficient-openpic")) return -ENODEV; rc = mpic_msi_init_allocator(mpic); if (rc) { pr_debug("pasemi_msi: Error allocating bitmap!\n"); return rc; } pr_debug("pasemi_msi: Registering PA Semi MPIC MSI callbacks\n"); msi_mpic = mpic; WARN_ON(ppc_md.setup_msi_irqs); ppc_md.setup_msi_irqs = pasemi_msi_setup_msi_irqs; ppc_md.teardown_msi_irqs = pasemi_msi_teardown_msi_irqs; ppc_md.msi_check_device = pasemi_msi_check_device; return 0; }