1 /* 2 * Common definitions across 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 extern void icp_native_flush_interrupt(void); 33 extern void icp_native_cause_ipi_rm(int cpu); 34 #else 35 static inline int icp_native_init(void) { return -ENODEV; } 36 #endif 37 38 /* PAPR ICP */ 39 #ifdef CONFIG_PPC_ICP_HV 40 extern int icp_hv_init(void); 41 #else 42 static inline int icp_hv_init(void) { return -ENODEV; } 43 #endif 44 45 #ifdef CONFIG_PPC_POWERNV 46 extern int icp_opal_init(void); 47 #else 48 static inline int icp_opal_init(void) { return -ENODEV; } 49 #endif 50 51 /* ICP ops */ 52 struct icp_ops { 53 unsigned int (*get_irq)(void); 54 void (*eoi)(struct irq_data *d); 55 void (*set_priority)(unsigned char prio); 56 void (*teardown_cpu)(void); 57 void (*flush_ipi)(void); 58 #ifdef CONFIG_SMP 59 void (*cause_ipi)(int cpu, unsigned long data); 60 irq_handler_t ipi_action; 61 #endif 62 }; 63 64 extern const struct icp_ops *icp_ops; 65 66 /* Native ICS */ 67 extern int ics_native_init(void); 68 69 /* RTAS ICS */ 70 #ifdef CONFIG_PPC_ICS_RTAS 71 extern int ics_rtas_init(void); 72 #else 73 static inline int ics_rtas_init(void) { return -ENODEV; } 74 #endif 75 76 /* HAL ICS */ 77 #ifdef CONFIG_PPC_POWERNV 78 extern int ics_opal_init(void); 79 #else 80 static inline int ics_opal_init(void) { return -ENODEV; } 81 #endif 82 83 /* ICS instance, hooked up to chip_data of an irq */ 84 struct ics { 85 struct list_head link; 86 int (*map)(struct ics *ics, unsigned int virq); 87 void (*mask_unknown)(struct ics *ics, unsigned long vec); 88 long (*get_server)(struct ics *ics, unsigned long vec); 89 int (*host_match)(struct ics *ics, struct device_node *node); 90 char data[]; 91 }; 92 93 /* Commons */ 94 extern unsigned int xics_default_server; 95 extern unsigned int xics_default_distrib_server; 96 extern unsigned int xics_interrupt_server_size; 97 extern struct irq_domain *xics_host; 98 99 struct xics_cppr { 100 unsigned char stack[MAX_NUM_PRIORITIES]; 101 int index; 102 }; 103 104 DECLARE_PER_CPU(struct xics_cppr, xics_cppr); 105 106 static inline void xics_push_cppr(unsigned int vec) 107 { 108 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 109 110 if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1)) 111 return; 112 113 if (vec == XICS_IPI) 114 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY; 115 else 116 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY; 117 } 118 119 static inline unsigned char xics_pop_cppr(void) 120 { 121 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 122 123 if (WARN_ON(os_cppr->index < 1)) 124 return LOWEST_PRIORITY; 125 126 return os_cppr->stack[--os_cppr->index]; 127 } 128 129 static inline void xics_set_base_cppr(unsigned char cppr) 130 { 131 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 132 133 /* we only really want to set the priority when there's 134 * just one cppr value on the stack 135 */ 136 WARN_ON(os_cppr->index != 0); 137 138 os_cppr->stack[0] = cppr; 139 } 140 141 static inline unsigned char xics_cppr_top(void) 142 { 143 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 144 145 return os_cppr->stack[os_cppr->index]; 146 } 147 148 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); 149 150 extern void xics_init(void); 151 extern void xics_setup_cpu(void); 152 extern void xics_update_irq_servers(void); 153 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join); 154 extern void xics_mask_unknown_vec(unsigned int vec); 155 extern irqreturn_t xics_ipi_dispatch(int cpu); 156 extern void xics_smp_probe(void); 157 extern void xics_register_ics(struct ics *ics); 158 extern void xics_teardown_cpu(void); 159 extern void xics_kexec_teardown_cpu(int secondary); 160 extern void xics_migrate_irqs_away(void); 161 extern void icp_native_eoi(struct irq_data *d); 162 #ifdef CONFIG_SMP 163 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask, 164 unsigned int strict_check); 165 #else 166 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server) 167 #endif 168 169 170 #endif /* _XICS_H */ 171