108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* Support Hypertransport IRQ
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*
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* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
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* Moved from arch/x86/kernel/apic/io_apic.c.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/htirq.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#include <asm/hypertransport.h>
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/*
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* Hypertransport interrupt support
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*/
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static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
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{
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struct ht_irq_msg msg;
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fetch_ht_irq_msg(irq, &msg);
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msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
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msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
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msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
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msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
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write_ht_irq_msg(irq, &msg);
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}
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static int
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ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
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{
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struct irq_cfg *cfg = irqd_cfg(data);
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unsigned int dest;
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int ret;
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ret = apic_set_affinity(data, mask, &dest);
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if (ret)
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return ret;
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target_ht_irq(data->irq, dest, cfg->vector);
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return IRQ_SET_MASK_OK_NOCOPY;
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}
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static struct irq_chip ht_irq_chip = {
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.name = "PCI-HT",
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.irq_mask = mask_ht_irq,
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.irq_unmask = unmask_ht_irq,
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.irq_ack = apic_ack_edge,
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.irq_set_affinity = ht_set_affinity,
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.irq_retrigger = apic_retrigger_irq,
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.flags = IRQCHIP_SKIP_SET_WAKE,
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};
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int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
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{
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struct irq_cfg *cfg;
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struct ht_irq_msg msg;
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unsigned dest;
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int err;
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if (disable_apic)
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return -ENXIO;
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cfg = irq_cfg(irq);
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err = assign_irq_vector(irq, cfg, apic->target_cpus());
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if (err)
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return err;
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err = apic->cpu_mask_to_apicid_and(cfg->domain,
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apic->target_cpus(), &dest);
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if (err)
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return err;
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msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
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msg.address_lo =
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HT_IRQ_LOW_BASE |
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HT_IRQ_LOW_DEST_ID(dest) |
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HT_IRQ_LOW_VECTOR(cfg->vector) |
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((apic->irq_dest_mode == 0) ?
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HT_IRQ_LOW_DM_PHYSICAL :
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HT_IRQ_LOW_DM_LOGICAL) |
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HT_IRQ_LOW_RQEOI_EDGE |
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((apic->irq_delivery_mode != dest_LowestPrio) ?
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HT_IRQ_LOW_MT_FIXED :
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HT_IRQ_LOW_MT_ARBITRATED) |
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HT_IRQ_LOW_IRQ_MASKED;
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write_ht_irq_msg(irq, &msg);
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irq_set_chip_and_handler_name(irq, &ht_irq_chip,
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handle_edge_irq, "edge");
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dev_dbg(&dev->dev, "irq %d for HT\n", irq);
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return 0;
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}
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