forked from Minki/linux
f7feaca77d
The arch hooks arch_setup_msi_irq and arch_teardown_msi_irq are now responsible for allocating and freeing the linux irq in addition to setting up the the linux irq to work with the interrupt. arch_setup_msi_irq now takes a pci_device and a msi_desc and returns an irq. With this change in place this code should be useable by all platforms except those that won't let the OS touch the hardware like ppc RTAS. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
/*
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* MSI hooks for standard x86 apic
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*/
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#include <linux/pci.h>
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#include <linux/irq.h>
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#include <linux/msi.h>
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#include <asm/smp.h>
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/*
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* Shifts for APIC-based data
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*/
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#define MSI_DATA_VECTOR_SHIFT 0
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#define MSI_DATA_VECTOR(v) (((u8)v) << MSI_DATA_VECTOR_SHIFT)
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#define MSI_DATA_DELIVERY_SHIFT 8
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#define MSI_DATA_DELIVERY_FIXED (0 << MSI_DATA_DELIVERY_SHIFT)
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#define MSI_DATA_DELIVERY_LOWPRI (1 << MSI_DATA_DELIVERY_SHIFT)
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#define MSI_DATA_LEVEL_SHIFT 14
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#define MSI_DATA_LEVEL_DEASSERT (0 << MSI_DATA_LEVEL_SHIFT)
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#define MSI_DATA_LEVEL_ASSERT (1 << MSI_DATA_LEVEL_SHIFT)
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#define MSI_DATA_TRIGGER_SHIFT 15
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#define MSI_DATA_TRIGGER_EDGE (0 << MSI_DATA_TRIGGER_SHIFT)
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#define MSI_DATA_TRIGGER_LEVEL (1 << MSI_DATA_TRIGGER_SHIFT)
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/*
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* Shift/mask fields for APIC-based bus address
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*/
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#define MSI_TARGET_CPU_SHIFT 4
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#define MSI_ADDR_HEADER 0xfee00000
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#define MSI_ADDR_DESTID_MASK 0xfff0000f
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#define MSI_ADDR_DESTID_CPU(cpu) ((cpu) << MSI_TARGET_CPU_SHIFT)
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#define MSI_ADDR_DESTMODE_SHIFT 2
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#define MSI_ADDR_DESTMODE_PHYS (0 << MSI_ADDR_DESTMODE_SHIFT)
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#define MSI_ADDR_DESTMODE_LOGIC (1 << MSI_ADDR_DESTMODE_SHIFT)
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#define MSI_ADDR_REDIRECTION_SHIFT 3
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#define MSI_ADDR_REDIRECTION_CPU (0 << MSI_ADDR_REDIRECTION_SHIFT)
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#define MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
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static struct irq_chip ia64_msi_chip;
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#ifdef CONFIG_SMP
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static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
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{
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struct msi_msg msg;
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u32 addr;
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read_msi_msg(irq, &msg);
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addr = msg.address_lo;
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addr &= MSI_ADDR_DESTID_MASK;
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addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(first_cpu(cpu_mask)));
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msg.address_lo = addr;
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write_msi_msg(irq, &msg);
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set_native_irq_info(irq, cpu_mask);
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}
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#endif /* CONFIG_SMP */
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int ia64_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
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{
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struct msi_msg msg;
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unsigned long dest_phys_id;
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unsigned int irq, vector;
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irq = create_irq();
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if (irq < 0)
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return irq;
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set_irq_msi(irq, desc);
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dest_phys_id = cpu_physical_id(first_cpu(cpu_online_map));
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vector = irq;
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msg.address_hi = 0;
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msg.address_lo =
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MSI_ADDR_HEADER |
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MSI_ADDR_DESTMODE_PHYS |
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MSI_ADDR_REDIRECTION_CPU |
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MSI_ADDR_DESTID_CPU(dest_phys_id);
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msg.data =
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MSI_DATA_TRIGGER_EDGE |
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MSI_DATA_LEVEL_ASSERT |
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MSI_DATA_DELIVERY_FIXED |
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MSI_DATA_VECTOR(vector);
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write_msi_msg(irq, &msg);
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set_irq_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);
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return irq;
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}
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void ia64_teardown_msi_irq(unsigned int irq)
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{
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destroy_irq(irq);
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}
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static void ia64_ack_msi_irq(unsigned int irq)
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{
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move_native_irq(irq);
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ia64_eoi();
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}
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static int ia64_msi_retrigger_irq(unsigned int irq)
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{
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unsigned int vector = irq;
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ia64_resend_irq(vector);
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return 1;
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}
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/*
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* Generic ops used on most IA64 platforms.
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*/
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static struct irq_chip ia64_msi_chip = {
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.name = "PCI-MSI",
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.mask = mask_msi_irq,
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.unmask = unmask_msi_irq,
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.ack = ia64_ack_msi_irq,
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#ifdef CONFIG_SMP
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.set_affinity = ia64_set_msi_irq_affinity,
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#endif
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.retrigger = ia64_msi_retrigger_irq,
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};
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int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
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{
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if (platform_setup_msi_irq)
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return platform_setup_msi_irq(pdev, desc);
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return ia64_setup_msi_irq(pdev, desc);
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}
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void arch_teardown_msi_irq(unsigned int irq)
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{
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if (platform_teardown_msi_irq)
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return platform_teardown_msi_irq(irq);
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return ia64_teardown_msi_irq(irq);
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}
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