arch/powerpc/include/asm/xics.h

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