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 extern void icp_native_eoi(struct irq_data *d); 154 #ifdef CONFIG_SMP 155 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask, 156 unsigned int strict_check); 157 #else 158 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server) 159 #endif 160 161 162 #endif /* _XICS_H */ 163