177 lines
3.9 KiB
C
177 lines
3.9 KiB
C
/*
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* Copyright 2006, Segher Boessenkool, IBM Corporation.
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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/bootmem.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 "mpic.h"
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/* A bit ugly, can we get this from the pci_dev somehow? */
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static struct mpic *msi_mpic;
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static void mpic_u3msi_mask_irq(unsigned int irq)
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{
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mask_msi_irq(irq);
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mpic_mask_irq(irq);
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}
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static void mpic_u3msi_unmask_irq(unsigned int irq)
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{
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mpic_unmask_irq(irq);
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unmask_msi_irq(irq);
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}
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static struct irq_chip mpic_u3msi_chip = {
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.shutdown = mpic_u3msi_mask_irq,
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.mask = mpic_u3msi_mask_irq,
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.unmask = mpic_u3msi_unmask_irq,
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.eoi = mpic_end_irq,
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.set_type = mpic_set_irq_type,
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.set_affinity = mpic_set_affinity,
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.typename = "MPIC-U3MSI",
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};
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static u64 read_ht_magic_addr(struct pci_dev *pdev, unsigned int pos)
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{
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u8 flags;
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u32 tmp;
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u64 addr;
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pci_read_config_byte(pdev, pos + HT_MSI_FLAGS, &flags);
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if (flags & HT_MSI_FLAGS_FIXED)
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return HT_MSI_FIXED_ADDR;
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pci_read_config_dword(pdev, pos + HT_MSI_ADDR_LO, &tmp);
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addr = tmp & HT_MSI_ADDR_LO_MASK;
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pci_read_config_dword(pdev, pos + HT_MSI_ADDR_HI, &tmp);
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addr = addr | ((u64)tmp << 32);
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return addr;
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}
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static u64 find_ht_magic_addr(struct pci_dev *pdev)
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{
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struct pci_bus *bus;
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unsigned int pos;
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for (bus = pdev->bus; bus; bus = bus->parent) {
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pos = pci_find_ht_capability(bus->self, HT_CAPTYPE_MSI_MAPPING);
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if (pos)
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return read_ht_magic_addr(bus->self, pos);
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}
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return 0;
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}
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static int u3msi_msi_check_device(struct pci_dev *pdev, int nvec, int type)
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{
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if (type == PCI_CAP_ID_MSIX)
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pr_debug("u3msi: MSI-X untested, trying anyway.\n");
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/* If we can't find a magic address then MSI ain't gonna work */
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if (find_ht_magic_addr(pdev) == 0) {
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pr_debug("u3msi: no magic address found for %s\n",
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pci_name(pdev));
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return -ENXIO;
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}
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return 0;
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}
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static void u3msi_teardown_msi_irqs(struct pci_dev *pdev)
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{
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struct msi_desc *entry;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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if (entry->irq == NO_IRQ)
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continue;
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set_irq_msi(entry->irq, NULL);
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msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap,
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virq_to_hw(entry->irq), 1);
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irq_dispose_mapping(entry->irq);
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}
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return;
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}
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static int u3msi_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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{
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unsigned int virq;
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struct msi_desc *entry;
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struct msi_msg msg;
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u64 addr;
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int hwirq;
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addr = find_ht_magic_addr(pdev);
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msg.address_lo = addr & 0xFFFFFFFF;
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msg.address_hi = addr >> 32;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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hwirq = msi_bitmap_alloc_hwirqs(&msi_mpic->msi_bitmap, 1);
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if (hwirq < 0) {
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pr_debug("u3msi: failed allocating hwirq\n");
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return hwirq;
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}
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virq = irq_create_mapping(msi_mpic->irqhost, hwirq);
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if (virq == NO_IRQ) {
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pr_debug("u3msi: failed mapping hwirq 0x%x\n", hwirq);
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msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq, 1);
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return -ENOSPC;
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}
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set_irq_msi(virq, entry);
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set_irq_chip(virq, &mpic_u3msi_chip);
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set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
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pr_debug("u3msi: allocated virq 0x%x (hw 0x%x) addr 0x%lx\n",
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virq, hwirq, (unsigned long)addr);
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msg.data = hwirq;
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write_msi_msg(virq, &msg);
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hwirq++;
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}
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return 0;
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}
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int mpic_u3msi_init(struct mpic *mpic)
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{
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int rc;
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rc = mpic_msi_init_allocator(mpic);
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if (rc) {
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pr_debug("u3msi: Error allocating bitmap!\n");
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return rc;
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}
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pr_debug("u3msi: Registering MPIC U3 MSI callbacks.\n");
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BUG_ON(msi_mpic);
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msi_mpic = mpic;
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WARN_ON(ppc_md.setup_msi_irqs);
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ppc_md.setup_msi_irqs = u3msi_setup_msi_irqs;
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ppc_md.teardown_msi_irqs = u3msi_teardown_msi_irqs;
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ppc_md.msi_check_device = u3msi_msi_check_device;
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return 0;
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}
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