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 #define MSI_DATA_VECTOR_MASK            0xffffff00
  17
  18 #define MSI_DATA_DELIVERY_SHIFT         8
  19 #define     MSI_DATA_DELIVERY_FIXED     (0 << MSI_DATA_DELIVERY_SHIFT)
  20 #define     MSI_DATA_DELIVERY_LOWPRI    (1 << MSI_DATA_DELIVERY_SHIFT)
  21
  22 #define MSI_DATA_LEVEL_SHIFT            14
  23 #define     MSI_DATA_LEVEL_DEASSERT     (0 << MSI_DATA_LEVEL_SHIFT)
  24 #define     MSI_DATA_LEVEL_ASSERT       (1 << MSI_DATA_LEVEL_SHIFT)
  25
  26 #define MSI_DATA_TRIGGER_SHIFT          15
  27 #define     MSI_DATA_TRIGGER_EDGE       (0 << MSI_DATA_TRIGGER_SHIFT)
  28 #define     MSI_DATA_TRIGGER_LEVEL      (1 << MSI_DATA_TRIGGER_SHIFT)
  29
  30 /*
  31  * Shift/mask fields for APIC-based bus address
  32  */
  33
  34 #define MSI_TARGET_CPU_SHIFT            4
  35 #define MSI_ADDR_HEADER                 0xfee00000
  36
  37 #define MSI_ADDR_DESTID_MASK            0xfff0000f
  38 #define     MSI_ADDR_DESTID_CPU(cpu)    ((cpu) << MSI_TARGET_CPU_SHIFT)
  39
  40 #define MSI_ADDR_DESTMODE_SHIFT         2
  41 #define     MSI_ADDR_DESTMODE_PHYS      (0 << MSI_ADDR_DESTMODE_SHIFT)
  42 #define     MSI_ADDR_DESTMODE_LOGIC     (1 << MSI_ADDR_DESTMODE_SHIFT)
  43
  44 #define MSI_ADDR_REDIRECTION_SHIFT      3
  45 #define     MSI_ADDR_REDIRECTION_CPU    (0 << MSI_ADDR_REDIRECTION_SHIFT)
  46 #define     MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
  47
  48 static struct irq_chip  ia64_msi_chip;
  49
  50 #ifdef CONFIG_SMP
  51 static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
  52 {
  53         struct msi_msg msg;
  54         u32 addr, data;
  55         int cpu = first_cpu(cpu_mask);
  56
  57         if (!cpu_online(cpu))
  58                 return;
  59
  60         if (irq_prepare_move(irq, cpu))
  61                 return;
  62
  63         read_msi_msg(irq, &msg);
  64
  65         addr = msg.address_lo;
  66         addr &= MSI_ADDR_DESTID_MASK;
  67         addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu));
  68         msg.address_lo = addr;
  69
  70         data = msg.data;
  71         data &= MSI_DATA_VECTOR_MASK;
  72         data |= MSI_DATA_VECTOR(irq_to_vector(irq));
  73         msg.data = data;
  74
  75         write_msi_msg(irq, &msg);
  76         irq_desc[irq].affinity = cpumask_of_cpu(cpu);
  77 }
  78 #endif /* CONFIG_SMP */
  79
  80 int ia64_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
  81 {
  82         struct msi_msg  msg;
  83         unsigned long   dest_phys_id;
  84         int     irq, vector;
  85         cpumask_t mask;
  86
  87         irq = create_irq();
  88         if (irq < 0)
  89                 return irq;
  90
  91         set_irq_msi(irq, desc);
  92         cpus_and(mask, irq_to_domain(irq), cpu_online_map);
  93         dest_phys_id = cpu_physical_id(first_cpu(mask));
  94         vector = irq_to_vector(irq);
  95
  96         msg.address_hi = 0;
  97         msg.address_lo =
  98                 MSI_ADDR_HEADER |
  99                 MSI_ADDR_DESTMODE_PHYS |
 100                 MSI_ADDR_REDIRECTION_CPU |
 101                 MSI_ADDR_DESTID_CPU(dest_phys_id);
 102
 103         msg.data =
 104                 MSI_DATA_TRIGGER_EDGE |
 105                 MSI_DATA_LEVEL_ASSERT |
 106                 MSI_DATA_DELIVERY_FIXED |
 107                 MSI_DATA_VECTOR(vector);
 108
 109         write_msi_msg(irq, &msg);
 110         set_irq_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);
 111
 112         return 0;
 113 }
 114
 115 void ia64_teardown_msi_irq(unsigned int irq)
 116 {
 117         destroy_irq(irq);
 118 }
 119
 120 static void ia64_ack_msi_irq(unsigned int irq)
 121 {
 122         irq_complete_move(irq);
 123         move_native_irq(irq);
 124         ia64_eoi();
 125 }
 126
 127 static int ia64_msi_retrigger_irq(unsigned int irq)
 128 {
 129         unsigned int vector = irq_to_vector(irq);
 130         ia64_resend_irq(vector);
 131
 132         return 1;
 133 }
 134
 135 /*
 136  * Generic ops used on most IA64 platforms.
 137  */
 138 static struct irq_chip ia64_msi_chip = {
 139         .name           = "PCI-MSI",
 140         .mask           = mask_msi_irq,
 141         .unmask         = unmask_msi_irq,
 142         .ack            = ia64_ack_msi_irq,
 143 #ifdef CONFIG_SMP
 144         .set_affinity   = ia64_set_msi_irq_affinity,
 145 #endif
 146         .retrigger      = ia64_msi_retrigger_irq,
 147 };
 148
 149
 150 int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
 151 {
 152         if (platform_setup_msi_irq)
 153                 return platform_setup_msi_irq(pdev, desc);
 154
 155         return ia64_setup_msi_irq(pdev, desc);
 156 }
 157
 158 void arch_teardown_msi_irq(unsigned int irq)
 159 {
 160         if (platform_teardown_msi_irq)
 161                 return platform_teardown_msi_irq(irq);
 162
 163         return ia64_teardown_msi_irq(irq);
 164 }