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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Common definitions across all variants of ICP and ICS interrupt
4 * controllers.
5 */
6
7#ifndef _XICS_H
8#define _XICS_H
9
10#include <linux/interrupt.h>
11
12#define XICS_IPI 2
13#define XICS_IRQ_SPURIOUS 0
14
15/* Want a priority other than 0. Various HW issues require this. */
16#define DEFAULT_PRIORITY 5
17
18/*
19 * Mark IPIs as higher priority so we can take them inside interrupts
20 * FIXME: still true now?
21 */
22#define IPI_PRIORITY 4
23
24/* The least favored priority */
25#define LOWEST_PRIORITY 0xFF
26
27/* The number of priorities defined above */
28#define MAX_NUM_PRIORITIES 3
29
30/* Native ICP */
31#ifdef CONFIG_PPC_ICP_NATIVE
32extern int icp_native_init(void);
33extern void icp_native_flush_interrupt(void);
34#else
35static inline int icp_native_init(void) { return -ENODEV; }
36#endif
37
38/* PAPR ICP */
39#ifdef CONFIG_PPC_ICP_HV
40int __init icp_hv_init(void);
41#else
42static inline int icp_hv_init(void) { return -ENODEV; }
43#endif
44
45#ifdef CONFIG_PPC_POWERNV
46int __init icp_opal_init(void);
47extern void icp_opal_flush_interrupt(void);
48#else
49static inline int icp_opal_init(void) { return -ENODEV; }
50#endif
51
52/* ICP ops */
53struct icp_ops {
54 unsigned int (*get_irq)(void);
55 void (*eoi)(struct irq_data *d);
56 void (*set_priority)(unsigned char prio);
57 void (*teardown_cpu)(void);
58 void (*flush_ipi)(void);
59#ifdef CONFIG_SMP
60 void (*cause_ipi)(int cpu);
61 irq_handler_t ipi_action;
62#endif
63};
64
65extern const struct icp_ops *icp_ops;
66
67#ifdef CONFIG_PPC_ICS_NATIVE
68/* Native ICS */
69extern int ics_native_init(void);
70#else
71static inline int ics_native_init(void) { return -ENODEV; }
72#endif
73
74/* RTAS ICS */
75#ifdef CONFIG_PPC_ICS_RTAS
76extern int ics_rtas_init(void);
77#else
78static inline int ics_rtas_init(void) { return -ENODEV; }
79#endif
80
81/* HAL ICS */
82#ifdef CONFIG_PPC_POWERNV
83extern int ics_opal_init(void);
84#else
85static inline int ics_opal_init(void) { return -ENODEV; }
86#endif
87
88/* ICS instance, hooked up to chip_data of an irq */
89struct ics {
90 struct list_head link;
91 int (*check)(struct ics *ics, unsigned int hwirq);
92 void (*mask_unknown)(struct ics *ics, unsigned long vec);
93 long (*get_server)(struct ics *ics, unsigned long vec);
94 int (*host_match)(struct ics *ics, struct device_node *node);
95 struct irq_chip *chip;
96 char data[];
97};
98
99/* Commons */
100extern unsigned int xics_default_server;
101extern unsigned int xics_default_distrib_server;
102extern unsigned int xics_interrupt_server_size;
103extern struct irq_domain *xics_host;
104
105struct xics_cppr {
106 unsigned char stack[MAX_NUM_PRIORITIES];
107 int index;
108};
109
110DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
111
112static inline void xics_push_cppr(unsigned int vec)
113{
114 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
115
116 if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
117 return;
118
119 if (vec == XICS_IPI)
120 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
121 else
122 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
123}
124
125static inline unsigned char xics_pop_cppr(void)
126{
127 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
128
129 if (WARN_ON(os_cppr->index < 1))
130 return LOWEST_PRIORITY;
131
132 return os_cppr->stack[--os_cppr->index];
133}
134
135static inline void xics_set_base_cppr(unsigned char cppr)
136{
137 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
138
139 /* we only really want to set the priority when there's
140 * just one cppr value on the stack
141 */
142 WARN_ON(os_cppr->index != 0);
143
144 os_cppr->stack[0] = cppr;
145}
146
147static inline unsigned char xics_cppr_top(void)
148{
149 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
150
151 return os_cppr->stack[os_cppr->index];
152}
153
154DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
155
156extern void xics_init(void);
157extern void xics_setup_cpu(void);
158extern void xics_update_irq_servers(void);
159extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
160extern void xics_mask_unknown_vec(unsigned int vec);
161extern void xics_smp_probe(void);
162extern void xics_register_ics(struct ics *ics);
163extern void xics_teardown_cpu(void);
164extern void xics_kexec_teardown_cpu(int secondary);
165extern void xics_migrate_irqs_away(void);
166extern void icp_native_eoi(struct irq_data *d);
167extern int xics_set_irq_type(struct irq_data *d, unsigned int flow_type);
168extern int xics_retrigger(struct irq_data *data);
169#ifdef CONFIG_SMP
170extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
171 unsigned int strict_check);
172#else
173#define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
174#endif
175
176
177#endif /* _XICS_H */