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 31extern int icp_native_init(void); 32extern void icp_native_flush_interrupt(void); 33#else 34static inline int icp_native_init(void) { return -ENODEV; } 35#endif 36 37/* PAPR ICP */ 38#ifdef CONFIG_PPC_ICP_HV 39extern int icp_hv_init(void); 40#else 41static inline int icp_hv_init(void) { return -ENODEV; } 42#endif 43 44/* ICP ops */ 45struct 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 57extern const struct icp_ops *icp_ops; 58 59/* Native ICS */ 60extern int ics_native_init(void); 61 62/* RTAS ICS */ 63#ifdef CONFIG_PPC_ICS_RTAS 64extern int ics_rtas_init(void); 65#else 66static inline int ics_rtas_init(void) { return -ENODEV; } 67#endif 68 69/* HAL ICS */ 70#ifdef CONFIG_PPC_POWERNV 71extern int ics_opal_init(void); 72#else 73static inline int ics_opal_init(void) { return -ENODEV; } 74#endif 75 76/* ICS instance, hooked up to chip_data of an irq */ 77struct 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 */ 87extern unsigned int xics_default_server; 88extern unsigned int xics_default_distrib_server; 89extern unsigned int xics_interrupt_server_size; 90extern struct irq_domain *xics_host; 91 92struct xics_cppr { 93 unsigned char stack[MAX_NUM_PRIORITIES]; 94 int index; 95}; 96 97DECLARE_PER_CPU(struct xics_cppr, xics_cppr); 98 99static 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 112static 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 122static 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 134static 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 141DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); 142 143extern void xics_init(void); 144extern void xics_setup_cpu(void); 145extern void xics_update_irq_servers(void); 146extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join); 147extern void xics_mask_unknown_vec(unsigned int vec); 148extern irqreturn_t xics_ipi_dispatch(int cpu); 149extern void xics_smp_probe(void); 150extern void xics_register_ics(struct ics *ics); 151extern void xics_teardown_cpu(void); 152extern void xics_kexec_teardown_cpu(int secondary); 153extern void xics_migrate_irqs_away(void); 154extern void icp_native_eoi(struct irq_data *d); 155#ifdef CONFIG_SMP 156extern 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