release/src-rt-6.x/linux/linux-2.6/arch/ia64/kernel/msi_ia64.c

   1 /*
   2  * MSI hooks for standard x86 apic
   3  */
   4
   5 #include <linux/pci.h>
   6 #include <linux/irq.h>
   7 #include <linux/msi.h>
   8 #include <asm/smp.h>
   9
  10 /*
  11  * Shifts for APIC-based data
  12  */
  13
  14 #define MSI_DATA_VECTOR_SHIFT           0
  15 #define     MSI_DATA_VECTOR(v)          (((u8)v) << MSI_DATA_VECTOR_SHIFT)
  16
  17 #define MSI_DATA_DELIVERY_SHIFT         8
  18 #define     MSI_DATA_DELIVERY_FIXED     (0 << MSI_DATA_DELIVERY_SHIFT)
  19 #define     MSI_DATA_DELIVERY_LOWPRI    (1 << MSI_DATA_DELIVERY_SHIFT)
  20
  21 #define MSI_DATA_LEVEL_SHIFT            14
  22 #define     MSI_DATA_LEVEL_DEASSERT     (0 << MSI_DATA_LEVEL_SHIFT)
  23 #define     MSI_DATA_LEVEL_ASSERT       (1 << MSI_DATA_LEVEL_SHIFT)
  24
  25 #define MSI_DATA_TRIGGER_SHIFT          15
  26 #define     MSI_DATA_TRIGGER_EDGE       (0 << MSI_DATA_TRIGGER_SHIFT)
  27 #define     MSI_DATA_TRIGGER_LEVEL      (1 << MSI_DATA_TRIGGER_SHIFT)
  28
  29 /*
  30  * Shift/mask fields for APIC-based bus address
  31  */
  32
  33 #define MSI_TARGET_CPU_SHIFT            4
  34 #define MSI_ADDR_HEADER                 0xfee00000
  35
  36 #define MSI_ADDR_DESTID_MASK            0xfff0000f
  37 #define     MSI_ADDR_DESTID_CPU(cpu)    ((cpu) << MSI_TARGET_CPU_SHIFT)
  38
  39 #define MSI_ADDR_DESTMODE_SHIFT         2
  40 #define     MSI_ADDR_DESTMODE_PHYS      (0 << MSI_ADDR_DESTMODE_SHIFT)
  41 #define     MSI_ADDR_DESTMODE_LOGIC     (1 << MSI_ADDR_DESTMODE_SHIFT)
  42
  43 #define MSI_ADDR_REDIRECTION_SHIFT      3
  44 #define     MSI_ADDR_REDIRECTION_CPU    (0 << MSI_ADDR_REDIRECTION_SHIFT)
  45 #define     MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
  46
  47 static struct irq_chip  ia64_msi_chip;
  48
  49 #ifdef CONFIG_SMP
  50 static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
  51 {
  52         struct msi_msg msg;
  53         u32 addr;
  54
  55         read_msi_msg(irq, &msg);
  56
  57         addr = msg.address_lo;
  58         addr &= MSI_ADDR_DESTID_MASK;
  59         addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(first_cpu(cpu_mask)));
  60         msg.address_lo = addr;
  61
  62         write_msi_msg(irq, &msg);
  63         irq_desc[irq].affinity = cpu_mask;
  64 }
  65 #endif /* CONFIG_SMP */
  66
  67 int ia64_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
  68 {
  69         struct msi_msg  msg;
  70         unsigned long   dest_phys_id;
  71         int     irq, vector;
  72
  73         irq = create_irq();
  74         if (irq < 0)
  75                 return irq;
  76
  77         set_irq_msi(irq, desc);
  78         dest_phys_id = cpu_physical_id(first_cpu(cpu_online_map));
  79         vector = irq_to_vector(irq);
  80
  81         msg.address_hi = 0;
  82         msg.address_lo =
  83                 MSI_ADDR_HEADER |
  84                 MSI_ADDR_DESTMODE_PHYS |
  85                 MSI_ADDR_REDIRECTION_CPU |
  86                 MSI_ADDR_DESTID_CPU(dest_phys_id);
  87
  88         msg.data =
  89                 MSI_DATA_TRIGGER_EDGE |
  90                 MSI_DATA_LEVEL_ASSERT |
  91                 MSI_DATA_DELIVERY_FIXED |
  92                 MSI_DATA_VECTOR(vector);
  93
  94         write_msi_msg(irq, &msg);
  95         set_irq_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);
  96
  97         return irq;
  98 }
  99
 100 void ia64_teardown_msi_irq(unsigned int irq)
 101 {
 102         destroy_irq(irq);
 103 }
 104
 105 static void ia64_ack_msi_irq(unsigned int irq)
 106 {
 107         move_native_irq(irq);
 108         ia64_eoi();
 109 }
 110
 111 static int ia64_msi_retrigger_irq(unsigned int irq)
 112 {
 113         unsigned int vector = irq_to_vector(irq);
 114         ia64_resend_irq(vector);
 115
 116         return 1;
 117 }
 118
 119 /*
 120  * Generic ops used on most IA64 platforms.
 121  */
 122 static struct irq_chip ia64_msi_chip = {
 123         .name           = "PCI-MSI",
 124         .mask           = mask_msi_irq,
 125         .unmask         = unmask_msi_irq,
 126         .ack            = ia64_ack_msi_irq,
 127 #ifdef CONFIG_SMP
 128         .set_affinity   = ia64_set_msi_irq_affinity,
 129 #endif
 130         .retrigger      = ia64_msi_retrigger_irq,
 131 };
 132
 133
 134 int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
 135 {
 136         if (platform_setup_msi_irq)
 137                 return platform_setup_msi_irq(pdev, desc);
 138
 139         return ia64_setup_msi_irq(pdev, desc);
 140 }
 141
 142 void arch_teardown_msi_irq(unsigned int irq)
 143 {
 144         if (platform_teardown_msi_irq)
 145                 return platform_teardown_msi_irq(irq);
 146
 147         return ia64_teardown_msi_irq(irq);
 148 }