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msi_ia64.c

/*
 * MSI hooks for standard x86 apic
 */

#include <linux/pci.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <asm/smp.h>

/*
 * Shifts for APIC-based data
 */

#define MSI_DATA_VECTOR_SHIFT       0
#define         MSI_DATA_VECTOR(v)        (((u8)v) << MSI_DATA_VECTOR_SHIFT)
#define MSI_DATA_VECTOR_MASK        0xffffff00

#define MSI_DATA_DELIVERY_SHIFT           8
#define     MSI_DATA_DELIVERY_FIXED (0 << MSI_DATA_DELIVERY_SHIFT)
#define     MSI_DATA_DELIVERY_LOWPRI      (1 << MSI_DATA_DELIVERY_SHIFT)

#define MSI_DATA_LEVEL_SHIFT        14
#define     MSI_DATA_LEVEL_DEASSERT (0 << MSI_DATA_LEVEL_SHIFT)
#define     MSI_DATA_LEVEL_ASSERT   (1 << MSI_DATA_LEVEL_SHIFT)

#define MSI_DATA_TRIGGER_SHIFT            15
#define     MSI_DATA_TRIGGER_EDGE   (0 << MSI_DATA_TRIGGER_SHIFT)
#define     MSI_DATA_TRIGGER_LEVEL  (1 << MSI_DATA_TRIGGER_SHIFT)

/*
 * Shift/mask fields for APIC-based bus address
 */

#define MSI_TARGET_CPU_SHIFT        4
#define MSI_ADDR_HEADER             0xfee00000

#define MSI_ADDR_DESTID_MASK        0xfff0000f
#define     MSI_ADDR_DESTID_CPU(cpu)      ((cpu) << MSI_TARGET_CPU_SHIFT)

#define MSI_ADDR_DESTMODE_SHIFT           2
#define     MSI_ADDR_DESTMODE_PHYS  (0 << MSI_ADDR_DESTMODE_SHIFT)
#define         MSI_ADDR_DESTMODE_LOGIC   (1 << MSI_ADDR_DESTMODE_SHIFT)

#define MSI_ADDR_REDIRECTION_SHIFT  3
#define     MSI_ADDR_REDIRECTION_CPU      (0 << MSI_ADDR_REDIRECTION_SHIFT)
#define     MSI_ADDR_REDIRECTION_LOWPRI   (1 << MSI_ADDR_REDIRECTION_SHIFT)

static struct irq_chip  ia64_msi_chip;

#ifdef CONFIG_SMP
static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
{
      struct msi_msg msg;
      u32 addr, data;
      int cpu = first_cpu(cpu_mask);

      if (!cpu_online(cpu))
            return;

      if (irq_prepare_move(irq, cpu))
            return;

      read_msi_msg(irq, &msg);

      addr = msg.address_lo;
      addr &= MSI_ADDR_DESTID_MASK;
      addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu));
      msg.address_lo = addr;

      data = msg.data;
      data &= MSI_DATA_VECTOR_MASK;
      data |= MSI_DATA_VECTOR(irq_to_vector(irq));
      msg.data = data;

      write_msi_msg(irq, &msg);
      irq_desc[irq].affinity = cpumask_of_cpu(cpu);
}
#endif /* CONFIG_SMP */

int ia64_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
{
      struct msi_msg    msg;
      unsigned long     dest_phys_id;
      int   irq, vector;
      cpumask_t mask;

      irq = create_irq();
      if (irq < 0)
            return irq;

      set_irq_msi(irq, desc);
      cpus_and(mask, irq_to_domain(irq), cpu_online_map);
      dest_phys_id = cpu_physical_id(first_cpu(mask));
      vector = irq_to_vector(irq);

      msg.address_hi = 0;
      msg.address_lo =
            MSI_ADDR_HEADER |
            MSI_ADDR_DESTMODE_PHYS |
            MSI_ADDR_REDIRECTION_CPU |
            MSI_ADDR_DESTID_CPU(dest_phys_id);

      msg.data =
            MSI_DATA_TRIGGER_EDGE |
            MSI_DATA_LEVEL_ASSERT |
            MSI_DATA_DELIVERY_FIXED |
            MSI_DATA_VECTOR(vector);

      write_msi_msg(irq, &msg);
      set_irq_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);

      return 0;
}

void ia64_teardown_msi_irq(unsigned int irq)
{
      destroy_irq(irq);
}

static void ia64_ack_msi_irq(unsigned int irq)
{
      irq_complete_move(irq);
      move_native_irq(irq);
      ia64_eoi();
}

static int ia64_msi_retrigger_irq(unsigned int irq)
{
      unsigned int vector = irq_to_vector(irq);
      ia64_resend_irq(vector);

      return 1;
}

/*
 * Generic ops used on most IA64 platforms.
 */
static struct irq_chip ia64_msi_chip = {
      .name       = "PCI-MSI",
      .mask       = mask_msi_irq,
      .unmask           = unmask_msi_irq,
      .ack        = ia64_ack_msi_irq,
#ifdef CONFIG_SMP
      .set_affinity     = ia64_set_msi_irq_affinity,
#endif
      .retrigger  = ia64_msi_retrigger_irq,
};


int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
{
      if (platform_setup_msi_irq)
            return platform_setup_msi_irq(pdev, desc);

      return ia64_setup_msi_irq(pdev, desc);
}

void arch_teardown_msi_irq(unsigned int irq)
{
      if (platform_teardown_msi_irq)
            return platform_teardown_msi_irq(irq);

      return ia64_teardown_msi_irq(irq);
}

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