1#ifdef __KERNEL__ 2#ifndef _ASM_POWERPC_IRQ_H 3#define _ASM_POWERPC_IRQ_H 4 5/* 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12#include <linux/threads.h> 13#include <linux/list.h> 14#include <linux/radix-tree.h> 15 16#include <asm/types.h> 17#include <asm/atomic.h> 18 19 20/* Define a way to iterate across irqs. */ 21#define for_each_irq(i) \ 22 for ((i) = 0; (i) < NR_IRQS; ++(i)) 23 24extern atomic_t ppc_n_lost_interrupts; 25 26/* This number is used when no interrupt has been assigned */ 27#define NO_IRQ (0) 28 29/* This is a special irq number to return from get_irq() to tell that 30 * no interrupt happened _and_ ignore it (don't count it as bad). Some 31 * platforms like iSeries rely on that. 32 */ 33#define NO_IRQ_IGNORE ((unsigned int)-1) 34 35/* Total number of virq in the platform */ 36#define NR_IRQS CONFIG_NR_IRQS 37 38/* Number of irqs reserved for the legacy controller */ 39#define NUM_ISA_INTERRUPTS 16 40 41/* Same thing, used by the generic IRQ code */ 42#define NR_IRQS_LEGACY NUM_ISA_INTERRUPTS 43 44/* This type is the placeholder for a hardware interrupt number. It has to 45 * be big enough to enclose whatever representation is used by a given 46 * platform. 47 */ 48typedef unsigned long irq_hw_number_t; 49 50/* Interrupt controller "host" data structure. This could be defined as a 51 * irq domain controller. That is, it handles the mapping between hardware 52 * and virtual interrupt numbers for a given interrupt domain. The host 53 * structure is generally created by the PIC code for a given PIC instance 54 * (though a host can cover more than one PIC if they have a flat number 55 * model). It's the host callbacks that are responsible for setting the 56 * irq_chip on a given irq_desc after it's been mapped. 57 * 58 * The host code and data structures are fairly agnostic to the fact that 59 * we use an open firmware device-tree. We do have references to struct 60 * device_node in two places: in irq_find_host() to find the host matching 61 * a given interrupt controller node, and of course as an argument to its 62 * counterpart host->ops->match() callback. However, those are treated as 63 * generic pointers by the core and the fact that it's actually a device-node 64 * pointer is purely a convention between callers and implementation. This 65 * code could thus be used on other architectures by replacing those two 66 * by some sort of arch-specific void * "token" used to identify interrupt 67 * controllers. 68 */ 69struct irq_host; 70struct radix_tree_root; 71 72/* Functions below are provided by the host and called whenever a new mapping 73 * is created or an old mapping is disposed. The host can then proceed to 74 * whatever internal data structures management is required. It also needs 75 * to setup the irq_desc when returning from map(). 76 */ 77struct irq_host_ops { 78 /* Match an interrupt controller device node to a host, returns 79 * 1 on a match 80 */ 81 int (*match)(struct irq_host *h, struct device_node *node); 82 83 /* Create or update a mapping between a virtual irq number and a hw 84 * irq number. This is called only once for a given mapping. 85 */ 86 int (*map)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw); 87 88 /* Dispose of such a mapping */ 89 void (*unmap)(struct irq_host *h, unsigned int virq); 90 91 /* Update of such a mapping */ 92 void (*remap)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw); 93 94 /* Translate device-tree interrupt specifier from raw format coming 95 * from the firmware to a irq_hw_number_t (interrupt line number) and 96 * type (sense) that can be passed to set_irq_type(). In the absence 97 * of this callback, irq_create_of_mapping() and irq_of_parse_and_map() 98 * will return the hw number in the first cell and IRQ_TYPE_NONE for 99 * the type (which amount to keeping whatever default value the 100 * interrupt controller has for that line) 101 */ 102 int (*xlate)(struct irq_host *h, struct device_node *ctrler, 103 const u32 *intspec, unsigned int intsize, 104 irq_hw_number_t *out_hwirq, unsigned int *out_type); 105}; 106 107struct irq_host { 108 struct list_head link; 109 110 /* type of reverse mapping technique */ 111 unsigned int revmap_type; 112#define IRQ_HOST_MAP_LEGACY 0 /* legacy 8259, gets irqs 1..15 */ 113#define IRQ_HOST_MAP_NOMAP 1 /* no fast reverse mapping */ 114#define IRQ_HOST_MAP_LINEAR 2 /* linear map of interrupts */ 115#define IRQ_HOST_MAP_TREE 3 /* radix tree */ 116 union { 117 struct { 118 unsigned int size; 119 unsigned int *revmap; 120 } linear; 121 struct radix_tree_root tree; 122 } revmap_data; 123 struct irq_host_ops *ops; 124 void *host_data; 125 irq_hw_number_t inval_irq; 126 127 /* Optional device node pointer */ 128 struct device_node *of_node; 129}; 130 131/* The main irq map itself is an array of NR_IRQ entries containing the 132 * associate host and irq number. An entry with a host of NULL is free. 133 * An entry can be allocated if it's free, the allocator always then sets 134 * hwirq first to the host's invalid irq number and then fills ops. 135 */ 136struct irq_map_entry { 137 irq_hw_number_t hwirq; 138 struct irq_host *host; 139}; 140 141extern struct irq_map_entry irq_map[NR_IRQS]; 142 143extern irq_hw_number_t virq_to_hw(unsigned int virq); 144 145/** 146 * irq_alloc_host - Allocate a new irq_host data structure 147 * @of_node: optional device-tree node of the interrupt controller 148 * @revmap_type: type of reverse mapping to use 149 * @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map 150 * @ops: map/unmap host callbacks 151 * @inval_irq: provide a hw number in that host space that is always invalid 152 * 153 * Allocates and initialize and irq_host structure. Note that in the case of 154 * IRQ_HOST_MAP_LEGACY, the map() callback will be called before this returns 155 * for all legacy interrupts except 0 (which is always the invalid irq for 156 * a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by 157 * this call as well. For a IRQ_HOST_MAP_TREE, the radix tree will be allocated 158 * later during boot automatically (the reverse mapping will use the slow path 159 * until that happens). 160 */ 161extern struct irq_host *irq_alloc_host(struct device_node *of_node, 162 unsigned int revmap_type, 163 unsigned int revmap_arg, 164 struct irq_host_ops *ops, 165 irq_hw_number_t inval_irq); 166 167 168/** 169 * irq_find_host - Locates a host for a given device node 170 * @node: device-tree node of the interrupt controller 171 */ 172extern struct irq_host *irq_find_host(struct device_node *node); 173 174 175/** 176 * irq_set_default_host - Set a "default" host 177 * @host: default host pointer 178 * 179 * For convenience, it's possible to set a "default" host that will be used 180 * whenever NULL is passed to irq_create_mapping(). It makes life easier for 181 * platforms that want to manipulate a few hard coded interrupt numbers that 182 * aren't properly represented in the device-tree. 183 */ 184extern void irq_set_default_host(struct irq_host *host); 185 186 187/** 188 * irq_set_virq_count - Set the maximum number of virt irqs 189 * @count: number of linux virtual irqs, capped with NR_IRQS 190 * 191 * This is mainly for use by platforms like iSeries who want to program 192 * the virtual irq number in the controller to avoid the reverse mapping 193 */ 194extern void irq_set_virq_count(unsigned int count); 195 196 197/** 198 * irq_create_mapping - Map a hardware interrupt into linux virq space 199 * @host: host owning this hardware interrupt or NULL for default host 200 * @hwirq: hardware irq number in that host space 201 * 202 * Only one mapping per hardware interrupt is permitted. Returns a linux 203 * virq number. 204 * If the sense/trigger is to be specified, set_irq_type() should be called 205 * on the number returned from that call. 206 */ 207extern unsigned int irq_create_mapping(struct irq_host *host, 208 irq_hw_number_t hwirq); 209 210 211/** 212 * irq_dispose_mapping - Unmap an interrupt 213 * @virq: linux virq number of the interrupt to unmap 214 */ 215extern void irq_dispose_mapping(unsigned int virq); 216 217/** 218 * irq_find_mapping - Find a linux virq from an hw irq number. 219 * @host: host owning this hardware interrupt 220 * @hwirq: hardware irq number in that host space 221 * 222 * This is a slow path, for use by generic code. It's expected that an 223 * irq controller implementation directly calls the appropriate low level 224 * mapping function. 225 */ 226extern unsigned int irq_find_mapping(struct irq_host *host, 227 irq_hw_number_t hwirq); 228 229/** 230 * irq_create_direct_mapping - Allocate a virq for direct mapping 231 * @host: host to allocate the virq for or NULL for default host 232 * 233 * This routine is used for irq controllers which can choose the hardware 234 * interrupt numbers they generate. In such a case it's simplest to use 235 * the linux virq as the hardware interrupt number. 236 */ 237extern unsigned int irq_create_direct_mapping(struct irq_host *host); 238 239/** 240 * irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping. 241 * @host: host owning this hardware interrupt 242 * @virq: linux irq number 243 * @hwirq: hardware irq number in that host space 244 * 245 * This is for use by irq controllers that use a radix tree reverse 246 * mapping for fast lookup. 247 */ 248extern void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq, 249 irq_hw_number_t hwirq); 250 251/** 252 * irq_radix_revmap_lookup - Find a linux virq from a hw irq number. 253 * @host: host owning this hardware interrupt 254 * @hwirq: hardware irq number in that host space 255 * 256 * This is a fast path, for use by irq controller code that uses radix tree 257 * revmaps 258 */ 259extern unsigned int irq_radix_revmap_lookup(struct irq_host *host, 260 irq_hw_number_t hwirq); 261 262/** 263 * irq_linear_revmap - Find a linux virq from a hw irq number. 264 * @host: host owning this hardware interrupt 265 * @hwirq: hardware irq number in that host space 266 * 267 * This is a fast path, for use by irq controller code that uses linear 268 * revmaps. It does fallback to the slow path if the revmap doesn't exist 269 * yet and will create the revmap entry with appropriate locking 270 */ 271 272extern unsigned int irq_linear_revmap(struct irq_host *host, 273 irq_hw_number_t hwirq); 274 275 276 277/** 278 * irq_alloc_virt - Allocate virtual irq numbers 279 * @host: host owning these new virtual irqs 280 * @count: number of consecutive numbers to allocate 281 * @hint: pass a hint number, the allocator will try to use a 1:1 mapping 282 * 283 * This is a low level function that is used internally by irq_create_mapping() 284 * and that can be used by some irq controllers implementations for things 285 * like allocating ranges of numbers for MSIs. The revmaps are left untouched. 286 */ 287extern unsigned int irq_alloc_virt(struct irq_host *host, 288 unsigned int count, 289 unsigned int hint); 290 291/** 292 * irq_free_virt - Free virtual irq numbers 293 * @virq: virtual irq number of the first interrupt to free 294 * @count: number of interrupts to free 295 * 296 * This function is the opposite of irq_alloc_virt. It will not clear reverse 297 * maps, this should be done previously by unmap'ing the interrupt. In fact, 298 * all interrupts covered by the range being freed should have been unmapped 299 * prior to calling this. 300 */ 301extern void irq_free_virt(unsigned int virq, unsigned int count); 302 303/** 304 * irq_early_init - Init irq remapping subsystem 305 */ 306extern void irq_early_init(void); 307 308static __inline__ int irq_canonicalize(int irq) 309{ 310 return irq; 311} 312 313extern int distribute_irqs; 314 315struct irqaction; 316struct pt_regs; 317 318#define __ARCH_HAS_DO_SOFTIRQ 319 320#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) 321/* 322 * Per-cpu stacks for handling critical, debug and machine check 323 * level interrupts. 324 */ 325extern struct thread_info *critirq_ctx[NR_CPUS]; 326extern struct thread_info *dbgirq_ctx[NR_CPUS]; 327extern struct thread_info *mcheckirq_ctx[NR_CPUS]; 328extern void exc_lvl_ctx_init(void); 329#else 330#define exc_lvl_ctx_init() 331#endif 332 333/* 334 * Per-cpu stacks for handling hard and soft interrupts. 335 */ 336extern struct thread_info *hardirq_ctx[NR_CPUS]; 337extern struct thread_info *softirq_ctx[NR_CPUS]; 338 339extern void irq_ctx_init(void); 340extern void call_do_softirq(struct thread_info *tp); 341extern int call_handle_irq(int irq, void *p1, 342 struct thread_info *tp, void *func); 343extern void do_IRQ(struct pt_regs *regs); 344 345#endif /* _ASM_IRQ_H */ 346#endif /* __KERNEL__ */ 347