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