1 #ifndef _ASM_IA64_HW_IRQ_H
2 #define _ASM_IA64_HW_IRQ_H
5 * Copyright (C) 2001, 2002 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
9 #include <linux/sched.h>
10 #include <linux/types.h>
12 #include <asm/machvec.h>
13 #include <asm/ptrace.h>
16 typedef u8 ia64_vector;
21 * 1,3-14 are reserved from firmware
23 * 16-255 (vectored external interrupts) are available
25 * 15 spurious interrupt (see IVR)
27 * 16 lowest priority, 255 highest priority
29 * 15 classes of 16 interrupts each.
31 #define IA64_MIN_VECTORED_IRQ 16
32 #define IA64_MAX_VECTORED_IRQ 255
33 #define IA64_NUM_VECTORS 256
35 #define IA64_SPURIOUS_INT_VECTOR 0x0f
38 * Vectors 0x10-0x1f are used for low priority interrupts, e.g. CMCI.
40 #define IA64_PCE_VECTOR 0x1e /* platform corrected error interrupt vector */
41 #define IA64_CMC_VECTOR 0x1f /* correctable machine-check interrupt vector */
43 * Vectors 0x20-0x2f are reserved for legacy ISA IRQs.
45 #define IA64_FIRST_DEVICE_VECTOR 0x30
46 #define IA64_LAST_DEVICE_VECTOR 0xe7
48 #define IA64_MCA_RENDEZ_VECTOR 0xe8 /* MCA rendez interrupt */
49 #define IA64_PERFMON_VECTOR 0xee /* performanc monitor interrupt vector */
50 #define IA64_TIMER_VECTOR 0xef /* use highest-prio group 15 interrupt for timer */
51 #define IA64_MCA_WAKEUP_VECTOR 0xf0 /* MCA wakeup (must be >MCA_RENDEZ_VECTOR) */
52 #define IA64_IPI_RESCHEDULE 0xfd /* SMP reschedule */
53 #define IA64_IPI_VECTOR 0xfe /* inter-processor interrupt vector */
55 /* Used for encoding redirected irqs */
57 #define IA64_IRQ_REDIRECTED (1 << 31)
59 /* IA64 inter-cpu interrupt related definitions */
61 #define IA64_IPI_DEFAULT_BASE_ADDR 0xfee00000
63 /* Delivery modes for inter-cpu interrupts */
65 IA64_IPI_DM_INT = 0x0, /* pend an external interrupt */
66 IA64_IPI_DM_PMI = 0x2, /* pend a PMI */
67 IA64_IPI_DM_NMI = 0x4, /* pend an NMI (vector 2) */
68 IA64_IPI_DM_INIT = 0x5, /* pend an INIT interrupt */
69 IA64_IPI_DM_EXTINT = 0x7, /* pend an 8259-compatible interrupt. */
72 extern __u8 isa_irq_to_vector_map[16];
73 #define isa_irq_to_vector(x) isa_irq_to_vector_map[(x)]
75 extern unsigned long ipi_base_addr;
77 extern struct hw_interrupt_type irq_type_ia64_lsapic; /* CPU-internal interrupt controller */
79 extern int ia64_alloc_vector (void); /* allocate a free vector */
80 extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);
81 extern void register_percpu_irq (ia64_vector vec, struct irqaction *action);
84 hw_resend_irq (struct hw_interrupt_type *h, unsigned int vector)
86 platform_send_ipi(smp_processor_id(), vector, IA64_IPI_DM_INT, 0);
90 * Default implementations for the irq-descriptor API:
93 extern struct irq_desc _irq_desc[NR_IRQS];
95 #ifndef CONFIG_IA64_GENERIC
96 static inline struct irq_desc *
97 __ia64_irq_desc (unsigned int irq)
99 return _irq_desc + irq;
102 static inline ia64_vector
103 __ia64_irq_to_vector (unsigned int irq)
105 return (ia64_vector) irq;
108 static inline unsigned int
109 __ia64_local_vector_to_irq (ia64_vector vec)
111 return (unsigned int) vec;
116 * Next follows the irq descriptor interface. On IA-64, each CPU supports 256 interrupt
117 * vectors. On smaller systems, there is a one-to-one correspondence between interrupt
118 * vectors and the Linux irq numbers. However, larger systems may have multiple interrupt
119 * domains meaning that the translation from vector number to irq number depends on the
120 * interrupt domain that a CPU belongs to. This API abstracts such platform-dependent
121 * differences and provides a uniform means to translate between vector and irq numbers
122 * and to obtain the irq descriptor for a given irq number.
125 /* Return a pointer to the irq descriptor for IRQ. */
126 static inline struct irq_desc *
129 return platform_irq_desc(irq);
132 /* Extract the IA-64 vector that corresponds to IRQ. */
133 static inline ia64_vector
134 irq_to_vector (int irq)
136 return platform_irq_to_vector(irq);
140 * Convert the local IA-64 vector to the corresponding irq number. This translation is
141 * done in the context of the interrupt domain that the currently executing CPU belongs
144 static inline unsigned int
145 local_vector_to_irq (ia64_vector vec)
147 return platform_local_vector_to_irq(vec);
150 #endif /* _ASM_IA64_HW_IRQ_H */