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 extern void icp_opal_flush_interrupt(void); 48 #else 49 static inline int icp_opal_init(void) { return -ENODEV; } 50 #endif 51 52 /* ICP ops */ 53 struct icp_ops { 54 unsigned int (*get_irq)(void); 55 void (*eoi)(struct irq_data *d); 56 void (*set_priority)(unsigned char prio); 57 void (*teardown_cpu)(void); 58 void (*flush_ipi)(void); 59 #ifdef CONFIG_SMP 60 void (*cause_ipi)(int cpu, unsigned long data); 61 irq_handler_t ipi_action; 62 #endif 63 }; 64 65 extern const struct icp_ops *icp_ops; 66 67 /* Native ICS */ 68 extern int ics_native_init(void); 69 70 /* RTAS ICS */ 71 #ifdef CONFIG_PPC_ICS_RTAS 72 extern int ics_rtas_init(void); 73 #else 74 static inline int ics_rtas_init(void) { return -ENODEV; } 75 #endif 76 77 /* HAL ICS */ 78 #ifdef CONFIG_PPC_POWERNV 79 extern int ics_opal_init(void); 80 #else 81 static inline int ics_opal_init(void) { return -ENODEV; } 82 #endif 83 84 /* ICS instance, hooked up to chip_data of an irq */ 85 struct ics { 86 struct list_head link; 87 int (*map)(struct ics *ics, unsigned int virq); 88 void (*mask_unknown)(struct ics *ics, unsigned long vec); 89 long (*get_server)(struct ics *ics, unsigned long vec); 90 int (*host_match)(struct ics *ics, struct device_node *node); 91 char data[]; 92 }; 93 94 /* Commons */ 95 extern unsigned int xics_default_server; 96 extern unsigned int xics_default_distrib_server; 97 extern unsigned int xics_interrupt_server_size; 98 extern struct irq_domain *xics_host; 99 100 struct xics_cppr { 101 unsigned char stack[MAX_NUM_PRIORITIES]; 102 int index; 103 }; 104 105 DECLARE_PER_CPU(struct xics_cppr, xics_cppr); 106 107 static inline void xics_push_cppr(unsigned int vec) 108 { 109 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 110 111 if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1)) 112 return; 113 114 if (vec == XICS_IPI) 115 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY; 116 else 117 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY; 118 } 119 120 static inline unsigned char xics_pop_cppr(void) 121 { 122 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 123 124 if (WARN_ON(os_cppr->index < 1)) 125 return LOWEST_PRIORITY; 126 127 return os_cppr->stack[--os_cppr->index]; 128 } 129 130 static inline void xics_set_base_cppr(unsigned char cppr) 131 { 132 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 133 134 /* we only really want to set the priority when there's 135 * just one cppr value on the stack 136 */ 137 WARN_ON(os_cppr->index != 0); 138 139 os_cppr->stack[0] = cppr; 140 } 141 142 static inline unsigned char xics_cppr_top(void) 143 { 144 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 145 146 return os_cppr->stack[os_cppr->index]; 147 } 148 149 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); 150 151 extern void xics_init(void); 152 extern void xics_setup_cpu(void); 153 extern void xics_update_irq_servers(void); 154 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join); 155 extern void xics_mask_unknown_vec(unsigned int vec); 156 extern irqreturn_t xics_ipi_dispatch(int cpu); 157 extern void xics_smp_probe(void); 158 extern void xics_register_ics(struct ics *ics); 159 extern void xics_teardown_cpu(void); 160 extern void xics_kexec_teardown_cpu(int secondary); 161 extern void xics_migrate_irqs_away(void); 162 extern void icp_native_eoi(struct irq_data *d); 163 extern int xics_set_irq_type(struct irq_data *d, unsigned int flow_type); 164 extern int xics_retrigger(struct irq_data *data); 165 #ifdef CONFIG_SMP 166 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask, 167 unsigned int strict_check); 168 #else 169 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server) 170 #endif 171 172 173 #endif /* _XICS_H */ 174