1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_HW_IRQ_H
3 #define _ASM_IA64_HW_IRQ_H
4
5 /*
6 * Copyright (C) 2001-2003 Hewlett-Packard Co
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 */
9
10 #include <linux/interrupt.h>
11 #include <linux/sched.h>
12 #include <linux/types.h>
13 #include <linux/profile.h>
14
15 #include <asm/ptrace.h>
16 #include <asm/smp.h>
17
18 typedef u8 ia64_vector;
19
20 /*
21 * 0 special
22 *
23 * 1,3-14 are reserved from firmware
24 *
25 * 16-255 (vectored external interrupts) are available
26 *
27 * 15 spurious interrupt (see IVR)
28 *
29 * 16 lowest priority, 255 highest priority
30 *
31 * 15 classes of 16 interrupts each.
32 */
33 #define IA64_MIN_VECTORED_IRQ 16
34 #define IA64_MAX_VECTORED_IRQ 255
35 #define IA64_NUM_VECTORS 256
36
37 #define AUTO_ASSIGN -1
38
39 #define IA64_SPURIOUS_INT_VECTOR 0x0f
40
41 /*
42 * Vectors 0x10-0x1f are used for low priority interrupts, e.g. CMCI.
43 */
44 #define IA64_CPEP_VECTOR 0x1c /* corrected platform error polling vector */
45 #define IA64_CMCP_VECTOR 0x1d /* corrected machine-check polling vector */
46 #define IA64_CPE_VECTOR 0x1e /* corrected platform error interrupt vector */
47 #define IA64_CMC_VECTOR 0x1f /* corrected machine-check interrupt vector */
48 /*
49 * Vectors 0x20-0x2f are reserved for legacy ISA IRQs.
50 * Use vectors 0x30-0xe7 as the default device vector range for ia64.
51 * Platforms may choose to reduce this range in platform_irq_setup, but the
52 * platform range must fall within
53 * [IA64_DEF_FIRST_DEVICE_VECTOR..IA64_DEF_LAST_DEVICE_VECTOR]
54 */
55 extern int ia64_first_device_vector;
56 extern int ia64_last_device_vector;
57
58 #ifdef CONFIG_SMP
59 /* Reserve the lower priority vector than device vectors for "move IRQ" IPI */
60 #define IA64_IRQ_MOVE_VECTOR 0x30 /* "move IRQ" IPI */
61 #define IA64_DEF_FIRST_DEVICE_VECTOR 0x31
62 #else
63 #define IA64_DEF_FIRST_DEVICE_VECTOR 0x30
64 #endif
65 #define IA64_DEF_LAST_DEVICE_VECTOR 0xe7
66 #define IA64_FIRST_DEVICE_VECTOR ia64_first_device_vector
67 #define IA64_LAST_DEVICE_VECTOR ia64_last_device_vector
68 #define IA64_MAX_DEVICE_VECTORS (IA64_DEF_LAST_DEVICE_VECTOR - IA64_DEF_FIRST_DEVICE_VECTOR + 1)
69 #define IA64_NUM_DEVICE_VECTORS (IA64_LAST_DEVICE_VECTOR - IA64_FIRST_DEVICE_VECTOR + 1)
70
71 #define IA64_MCA_RENDEZ_VECTOR 0xe8 /* MCA rendez interrupt */
72 #define IA64_TIMER_VECTOR 0xef /* use highest-prio group 15 interrupt for timer */
73 #define IA64_MCA_WAKEUP_VECTOR 0xf0 /* MCA wakeup (must be >MCA_RENDEZ_VECTOR) */
74 #define IA64_IPI_LOCAL_TLB_FLUSH 0xfc /* SMP flush local TLB */
75 #define IA64_IPI_RESCHEDULE 0xfd /* SMP reschedule */
76 #define IA64_IPI_VECTOR 0xfe /* inter-processor interrupt vector */
77
78 /* Used for encoding redirected irqs */
79
80 #define IA64_IRQ_REDIRECTED (1 << 31)
81
82 /* IA64 inter-cpu interrupt related definitions */
83
84 #define IA64_IPI_DEFAULT_BASE_ADDR 0xfee00000
85
86 /* Delivery modes for inter-cpu interrupts */
87 enum {
88 IA64_IPI_DM_INT = 0x0, /* pend an external interrupt */
89 IA64_IPI_DM_PMI = 0x2, /* pend a PMI */
90 IA64_IPI_DM_NMI = 0x4, /* pend an NMI (vector 2) */
91 IA64_IPI_DM_INIT = 0x5, /* pend an INIT interrupt */
92 IA64_IPI_DM_EXTINT = 0x7, /* pend an 8259-compatible interrupt. */
93 };
94
95 extern __u8 isa_irq_to_vector_map[16];
96 #define isa_irq_to_vector(x) isa_irq_to_vector_map[(x)]
97
98 struct irq_cfg {
99 ia64_vector vector;
100 cpumask_t domain;
101 cpumask_t old_domain;
102 unsigned move_cleanup_count;
103 u8 move_in_progress : 1;
104 };
105 extern spinlock_t vector_lock;
106 extern struct irq_cfg irq_cfg[NR_IRQS];
107 #define irq_to_domain(x) irq_cfg[(x)].domain
108 DECLARE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq);
109
110 extern struct irq_chip irq_type_ia64_lsapic; /* CPU-internal interrupt controller */
111
112 #define ia64_register_ipi ia64_native_register_ipi
113 #define assign_irq_vector ia64_native_assign_irq_vector
114 #define free_irq_vector ia64_native_free_irq_vector
115 #define ia64_resend_irq ia64_native_resend_irq
116
117 extern void ia64_native_register_ipi(void);
118 extern int bind_irq_vector(int irq, int vector, cpumask_t domain);
119 extern int ia64_native_assign_irq_vector (int irq); /* allocate a free vector */
120 extern void ia64_native_free_irq_vector (int vector);
121 extern int reserve_irq_vector (int vector);
122 extern void __setup_vector_irq(int cpu);
123 extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);
124 extern void destroy_and_reserve_irq (unsigned int irq);
125
126 #ifdef CONFIG_SMP
127 extern int irq_prepare_move(int irq, int cpu);
128 extern void irq_complete_move(unsigned int irq);
129 #else
irq_prepare_move(int irq,int cpu)130 static inline int irq_prepare_move(int irq, int cpu) { return 0; }
irq_complete_move(unsigned int irq)131 static inline void irq_complete_move(unsigned int irq) {}
132 #endif
133
ia64_native_resend_irq(unsigned int vector)134 static inline void ia64_native_resend_irq(unsigned int vector)
135 {
136 ia64_send_ipi(smp_processor_id(), vector, IA64_IPI_DM_INT, 0);
137 }
138
139 /*
140 * Next follows the irq descriptor interface. On IA-64, each CPU supports 256 interrupt
141 * vectors. On smaller systems, there is a one-to-one correspondence between interrupt
142 * vectors and the Linux irq numbers. However, larger systems may have multiple interrupt
143 * domains meaning that the translation from vector number to irq number depends on the
144 * interrupt domain that a CPU belongs to. This API abstracts such platform-dependent
145 * differences and provides a uniform means to translate between vector and irq numbers
146 * and to obtain the irq descriptor for a given irq number.
147 */
148
149 /* Extract the IA-64 vector that corresponds to IRQ. */
150 static inline ia64_vector
irq_to_vector(int irq)151 irq_to_vector (int irq)
152 {
153 return irq_cfg[irq].vector;
154 }
155
156 /*
157 * Convert the local IA-64 vector to the corresponding irq number. This translation is
158 * done in the context of the interrupt domain that the currently executing CPU belongs
159 * to.
160 */
161 static inline unsigned int
local_vector_to_irq(ia64_vector vec)162 local_vector_to_irq (ia64_vector vec)
163 {
164 return __this_cpu_read(vector_irq[vec]);
165 }
166
167 #endif /* _ASM_IA64_HW_IRQ_H */
168