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