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
  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
  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
  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
  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
  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
  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
 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
 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
 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 */