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 */ 143