1 /*
2 * Common definitions accross 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
31 extern int icp_native_init(void);
32 #else
icp_native_init(void)33 static inline int icp_native_init(void) { return -ENODEV; }
34 #endif
35
36 /* PAPR ICP */
37 #ifdef CONFIG_PPC_ICP_HV
38 extern int icp_hv_init(void);
39 #else
icp_hv_init(void)40 static inline int icp_hv_init(void) { return -ENODEV; }
41 #endif
42
43 /* ICP ops */
44 struct icp_ops {
45 unsigned int (*get_irq)(void);
46 void (*eoi)(struct irq_data *d);
47 void (*set_priority)(unsigned char prio);
48 void (*teardown_cpu)(void);
49 void (*flush_ipi)(void);
50 #ifdef CONFIG_SMP
51 void (*cause_ipi)(int cpu, unsigned long data);
52 irq_handler_t ipi_action;
53 #endif
54 };
55
56 extern const struct icp_ops *icp_ops;
57
58 /* Native ICS */
59 extern int ics_native_init(void);
60
61 /* RTAS ICS */
62 #ifdef CONFIG_PPC_ICS_RTAS
63 extern int ics_rtas_init(void);
64 #else
ics_rtas_init(void)65 static inline int ics_rtas_init(void) { return -ENODEV; }
66 #endif
67
68 /* HAL ICS */
69 #ifdef CONFIG_PPC_POWERNV
70 extern int ics_opal_init(void);
71 #else
ics_opal_init(void)72 static inline int ics_opal_init(void) { return -ENODEV; }
73 #endif
74
75 /* ICS instance, hooked up to chip_data of an irq */
76 struct ics {
77 struct list_head link;
78 int (*map)(struct ics *ics, unsigned int virq);
79 void (*mask_unknown)(struct ics *ics, unsigned long vec);
80 long (*get_server)(struct ics *ics, unsigned long vec);
81 int (*host_match)(struct ics *ics, struct device_node *node);
82 char data[];
83 };
84
85 /* Commons */
86 extern unsigned int xics_default_server;
87 extern unsigned int xics_default_distrib_server;
88 extern unsigned int xics_interrupt_server_size;
89 extern struct irq_domain *xics_host;
90
91 struct xics_cppr {
92 unsigned char stack[MAX_NUM_PRIORITIES];
93 int index;
94 };
95
96 DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
97
xics_push_cppr(unsigned int vec)98 static inline void xics_push_cppr(unsigned int vec)
99 {
100 struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
101
102 if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
103 return;
104
105 if (vec == XICS_IPI)
106 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
107 else
108 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
109 }
110
xics_pop_cppr(void)111 static inline unsigned char xics_pop_cppr(void)
112 {
113 struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
114
115 if (WARN_ON(os_cppr->index < 1))
116 return LOWEST_PRIORITY;
117
118 return os_cppr->stack[--os_cppr->index];
119 }
120
xics_set_base_cppr(unsigned char cppr)121 static inline void xics_set_base_cppr(unsigned char cppr)
122 {
123 struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
124
125 /* we only really want to set the priority when there's
126 * just one cppr value on the stack
127 */
128 WARN_ON(os_cppr->index != 0);
129
130 os_cppr->stack[0] = cppr;
131 }
132
xics_cppr_top(void)133 static inline unsigned char xics_cppr_top(void)
134 {
135 struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr);
136
137 return os_cppr->stack[os_cppr->index];
138 }
139
140 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
141
142 extern void xics_init(void);
143 extern void xics_setup_cpu(void);
144 extern void xics_update_irq_servers(void);
145 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
146 extern void xics_mask_unknown_vec(unsigned int vec);
147 extern irqreturn_t xics_ipi_dispatch(int cpu);
148 extern int xics_smp_probe(void);
149 extern void xics_register_ics(struct ics *ics);
150 extern void xics_teardown_cpu(void);
151 extern void xics_kexec_teardown_cpu(int secondary);
152 extern void xics_migrate_irqs_away(void);
153 #ifdef CONFIG_SMP
154 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
155 unsigned int strict_check);
156 #else
157 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
158 #endif
159
160
161 #endif /* _XICS_H */
162