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authorMark Salter <msalter@redhat.com>2012-01-26 09:26:21 -0500
committerGrant Likely <grant.likely@secretlab.ca>2012-02-16 08:11:24 -0500
commit0bd761e1b6d909d3fd08841be7d5035f9fde8a53 (patch)
tree9ea9032e6259e2a6fd495e75db7755cdb92cef3e
parenta18dc81bf58258ac0920bec26b91656cb0140d2a (diff)
irq_domain/c6x: Convert c6x to use generic irq_domain support.
The C6X IRQ support was copied almost verbatim from the PowerPC virtual IRQ code. The PowerPC code was used as the basis for generic irq_domain support, so this patch mostly copies what what done to arch/powerpc by Grant Likely in his irq_domain patch series. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat
-rw-r--r--arch/c6x/Kconfig1
-rw-r--r--arch/c6x/include/asm/irq.h245
-rw-r--r--arch/c6x/kernel/irq.c611
-rw-r--r--arch/c6x/platforms/megamod-pic.c13
4 files changed, 21 insertions, 849 deletions
diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index 26e67f0f0051..3c64b2894c13 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -12,6 +12,7 @@ config TMS320C6X
12 select HAVE_GENERIC_HARDIRQS 12 select HAVE_GENERIC_HARDIRQS
13 select HAVE_MEMBLOCK 13 select HAVE_MEMBLOCK
14 select HAVE_SPARSE_IRQ 14 select HAVE_SPARSE_IRQ
15 select IRQ_DOMAIN
15 select OF 16 select OF
16 select OF_EARLY_FLATTREE 17 select OF_EARLY_FLATTREE
17 18
diff --git a/arch/c6x/include/asm/irq.h b/arch/c6x/include/asm/irq.h
index a6ae3c9d9c40..f13b78d5e1ca 100644
--- a/arch/c6x/include/asm/irq.h
+++ b/arch/c6x/include/asm/irq.h
@@ -13,6 +13,7 @@
13#ifndef _ASM_C6X_IRQ_H 13#ifndef _ASM_C6X_IRQ_H
14#define _ASM_C6X_IRQ_H 14#define _ASM_C6X_IRQ_H
15 15
16#include <linux/irqdomain.h>
16#include <linux/threads.h> 17#include <linux/threads.h>
17#include <linux/list.h> 18#include <linux/list.h>
18#include <linux/radix-tree.h> 19#include <linux/radix-tree.h>
@@ -41,253 +42,9 @@
41/* This number is used when no interrupt has been assigned */ 42/* This number is used when no interrupt has been assigned */
42#define NO_IRQ 0 43#define NO_IRQ 0
43 44
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;
71struct device_node;
72
73/* Functions below are provided by the host and called whenever a new mapping
74 * is created or an old mapping is disposed. The host can then proceed to
75 * whatever internal data structures management is required. It also needs
76 * to setup the irq_desc when returning from map().
77 */
78struct irq_host_ops {
79 /* Match an interrupt controller device node to a host, returns
80 * 1 on a match
81 */
82 int (*match)(struct irq_host *h, struct device_node *node);
83
84 /* Create or update a mapping between a virtual irq number and a hw
85 * irq number. This is called only once for a given mapping.
86 */
87 int (*map)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
88
89 /* Dispose of such a mapping */
90 void (*unmap)(struct irq_host *h, unsigned int virq);
91
92 /* Translate device-tree interrupt specifier from raw format coming
93 * from the firmware to a irq_hw_number_t (interrupt line number) and
94 * type (sense) that can be passed to set_irq_type(). In the absence
95 * of this callback, irq_create_of_mapping() and irq_of_parse_and_map()
96 * will return the hw number in the first cell and IRQ_TYPE_NONE for
97 * the type (which amount to keeping whatever default value the
98 * interrupt controller has for that line)
99 */
100 int (*xlate)(struct irq_host *h, struct device_node *ctrler,
101 const u32 *intspec, unsigned int intsize,
102 irq_hw_number_t *out_hwirq, unsigned int *out_type);
103};
104
105struct irq_host {
106 struct list_head link;
107
108 /* type of reverse mapping technique */
109 unsigned int revmap_type;
110#define IRQ_HOST_MAP_PRIORITY 0 /* core priority irqs, get irqs 1..15 */
111#define IRQ_HOST_MAP_NOMAP 1 /* no fast reverse mapping */
112#define IRQ_HOST_MAP_LINEAR 2 /* linear map of interrupts */
113#define IRQ_HOST_MAP_TREE 3 /* radix tree */
114 union {
115 struct {
116 unsigned int size;
117 unsigned int *revmap;
118 } linear;
119 struct radix_tree_root tree;
120 } revmap_data;
121 struct irq_host_ops *ops;
122 void *host_data;
123 irq_hw_number_t inval_irq;
124
125 /* Optional device node pointer */
126 struct device_node *of_node;
127};
128
129struct irq_data; 45struct irq_data;
130extern irq_hw_number_t irqd_to_hwirq(struct irq_data *d); 46extern irq_hw_number_t irqd_to_hwirq(struct irq_data *d);
131extern irq_hw_number_t virq_to_hw(unsigned int virq); 47extern irq_hw_number_t virq_to_hw(unsigned int virq);
132extern bool virq_is_host(unsigned int virq, struct irq_host *host);
133
134/**
135 * irq_alloc_host - Allocate a new irq_host data structure
136 * @of_node: optional device-tree node of the interrupt controller
137 * @revmap_type: type of reverse mapping to use
138 * @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map
139 * @ops: map/unmap host callbacks
140 * @inval_irq: provide a hw number in that host space that is always invalid
141 *
142 * Allocates and initialize and irq_host structure. Note that in the case of
143 * IRQ_HOST_MAP_LEGACY, the map() callback will be called before this returns
144 * for all legacy interrupts except 0 (which is always the invalid irq for
145 * a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by
146 * this call as well. For a IRQ_HOST_MAP_TREE, the radix tree will be allocated
147 * later during boot automatically (the reverse mapping will use the slow path
148 * until that happens).
149 */
150extern struct irq_host *irq_alloc_host(struct device_node *of_node,
151 unsigned int revmap_type,
152 unsigned int revmap_arg,
153 struct irq_host_ops *ops,
154 irq_hw_number_t inval_irq);
155
156
157/**
158 * irq_find_host - Locates a host for a given device node
159 * @node: device-tree node of the interrupt controller
160 */
161extern struct irq_host *irq_find_host(struct device_node *node);
162
163
164/**
165 * irq_set_default_host - Set a "default" host
166 * @host: default host pointer
167 *
168 * For convenience, it's possible to set a "default" host that will be used
169 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
170 * platforms that want to manipulate a few hard coded interrupt numbers that
171 * aren't properly represented in the device-tree.
172 */
173extern void irq_set_default_host(struct irq_host *host);
174
175
176/**
177 * irq_set_virq_count - Set the maximum number of virt irqs
178 * @count: number of linux virtual irqs, capped with NR_IRQS
179 *
180 * This is mainly for use by platforms like iSeries who want to program
181 * the virtual irq number in the controller to avoid the reverse mapping
182 */
183extern void irq_set_virq_count(unsigned int count);
184
185
186/**
187 * irq_create_mapping - Map a hardware interrupt into linux virq space
188 * @host: host owning this hardware interrupt or NULL for default host
189 * @hwirq: hardware irq number in that host space
190 *
191 * Only one mapping per hardware interrupt is permitted. Returns a linux
192 * virq number.
193 * If the sense/trigger is to be specified, set_irq_type() should be called
194 * on the number returned from that call.
195 */
196extern unsigned int irq_create_mapping(struct irq_host *host,
197 irq_hw_number_t hwirq);
198
199
200/**
201 * irq_dispose_mapping - Unmap an interrupt
202 * @virq: linux virq number of the interrupt to unmap
203 */
204extern void irq_dispose_mapping(unsigned int virq);
205
206/**
207 * irq_find_mapping - Find a linux virq from an hw irq number.
208 * @host: host owning this hardware interrupt
209 * @hwirq: hardware irq number in that host space
210 *
211 * This is a slow path, for use by generic code. It's expected that an
212 * irq controller implementation directly calls the appropriate low level
213 * mapping function.
214 */
215extern unsigned int irq_find_mapping(struct irq_host *host,
216 irq_hw_number_t hwirq);
217
218/**
219 * irq_create_direct_mapping - Allocate a virq for direct mapping
220 * @host: host to allocate the virq for or NULL for default host
221 *
222 * This routine is used for irq controllers which can choose the hardware
223 * interrupt numbers they generate. In such a case it's simplest to use
224 * the linux virq as the hardware interrupt number.
225 */
226extern unsigned int irq_create_direct_mapping(struct irq_host *host);
227
228/**
229 * irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.
230 * @host: host owning this hardware interrupt
231 * @virq: linux irq number
232 * @hwirq: hardware irq number in that host space
233 *
234 * This is for use by irq controllers that use a radix tree reverse
235 * mapping for fast lookup.
236 */
237extern void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
238 irq_hw_number_t hwirq);
239
240/**
241 * irq_radix_revmap_lookup - Find a linux virq from a hw irq number.
242 * @host: host owning this hardware interrupt
243 * @hwirq: hardware irq number in that host space
244 *
245 * This is a fast path, for use by irq controller code that uses radix tree
246 * revmaps
247 */
248extern unsigned int irq_radix_revmap_lookup(struct irq_host *host,
249 irq_hw_number_t hwirq);
250
251/**
252 * irq_linear_revmap - 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 linear
257 * revmaps. It does fallback to the slow path if the revmap doesn't exist
258 * yet and will create the revmap entry with appropriate locking
259 */
260
261extern unsigned int irq_linear_revmap(struct irq_host *host,
262 irq_hw_number_t hwirq);
263
264
265
266/**
267 * irq_alloc_virt - Allocate virtual irq numbers
268 * @host: host owning these new virtual irqs
269 * @count: number of consecutive numbers to allocate
270 * @hint: pass a hint number, the allocator will try to use a 1:1 mapping
271 *
272 * This is a low level function that is used internally by irq_create_mapping()
273 * and that can be used by some irq controllers implementations for things
274 * like allocating ranges of numbers for MSIs. The revmaps are left untouched.
275 */
276extern unsigned int irq_alloc_virt(struct irq_host *host,
277 unsigned int count,
278 unsigned int hint);
279
280/**
281 * irq_free_virt - Free virtual irq numbers
282 * @virq: virtual irq number of the first interrupt to free
283 * @count: number of interrupts to free
284 *
285 * This function is the opposite of irq_alloc_virt. It will not clear reverse
286 * maps, this should be done previously by unmap'ing the interrupt. In fact,
287 * all interrupts covered by the range being freed should have been unmapped
288 * prior to calling this.
289 */
290extern void irq_free_virt(unsigned int virq, unsigned int count);
291 48
292extern void __init init_pic_c64xplus(void); 49extern void __init init_pic_c64xplus(void);
293 50
diff --git a/arch/c6x/kernel/irq.c b/arch/c6x/kernel/irq.c
index 0929e4b2b244..3d5ac600a38b 100644
--- a/arch/c6x/kernel/irq.c
+++ b/arch/c6x/kernel/irq.c
@@ -73,10 +73,10 @@ asmlinkage void c6x_do_IRQ(unsigned int prio, struct pt_regs *regs)
73 set_irq_regs(old_regs); 73 set_irq_regs(old_regs);
74} 74}
75 75
76static struct irq_host *core_host; 76static struct irq_domain *core_domain;
77 77
78static int core_host_map(struct irq_host *h, unsigned int virq, 78static int core_domain_map(struct irq_domain *h, unsigned int virq,
79 irq_hw_number_t hw) 79 irq_hw_number_t hw)
80{ 80{
81 if (hw < 4 || hw >= NR_PRIORITY_IRQS) 81 if (hw < 4 || hw >= NR_PRIORITY_IRQS)
82 return -EINVAL; 82 return -EINVAL;
@@ -86,8 +86,8 @@ static int core_host_map(struct irq_host *h, unsigned int virq,
86 return 0; 86 return 0;
87} 87}
88 88
89static struct irq_host_ops core_host_ops = { 89static struct irq_domain_ops core_domain_ops = {
90 .map = core_host_map, 90 .map = core_domain_map,
91}; 91};
92 92
93void __init init_IRQ(void) 93void __init init_IRQ(void)
@@ -100,10 +100,11 @@ void __init init_IRQ(void)
100 np = of_find_compatible_node(NULL, NULL, "ti,c64x+core-pic"); 100 np = of_find_compatible_node(NULL, NULL, "ti,c64x+core-pic");
101 if (np != NULL) { 101 if (np != NULL) {
102 /* create the core host */ 102 /* create the core host */
103 core_host = irq_alloc_host(np, IRQ_HOST_MAP_PRIORITY, 0, 103 core_domain = irq_domain_add_legacy(np, NR_PRIORITY_IRQS,
104 &core_host_ops, 0); 104 0, 0, &core_domain_ops,
105 if (core_host) 105 NULL);
106 irq_set_default_host(core_host); 106 if (core_domain)
107 irq_set_default_host(core_domain);
107 of_node_put(np); 108 of_node_put(np);
108 } 109 }
109 110
@@ -128,601 +129,15 @@ int arch_show_interrupts(struct seq_file *p, int prec)
128 return 0; 129 return 0;
129} 130}
130 131
131/*
132 * IRQ controller and virtual interrupts
133 */
134
135/* The main irq map itself is an array of NR_IRQ entries containing the
136 * associate host and irq number. An entry with a host of NULL is free.
137 * An entry can be allocated if it's free, the allocator always then sets
138 * hwirq first to the host's invalid irq number and then fills ops.
139 */
140struct irq_map_entry {
141 irq_hw_number_t hwirq;
142 struct irq_host *host;
143};
144
145static LIST_HEAD(irq_hosts);
146static DEFINE_RAW_SPINLOCK(irq_big_lock);
147static DEFINE_MUTEX(revmap_trees_mutex);
148static struct irq_map_entry irq_map[NR_IRQS];
149static unsigned int irq_virq_count = NR_IRQS;
150static struct irq_host *irq_default_host;
151
152irq_hw_number_t irqd_to_hwirq(struct irq_data *d) 132irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
153{ 133{
154 return irq_map[d->irq].hwirq; 134 return d->hwirq;
155} 135}
156EXPORT_SYMBOL_GPL(irqd_to_hwirq); 136EXPORT_SYMBOL_GPL(irqd_to_hwirq);
157 137
158irq_hw_number_t virq_to_hw(unsigned int virq) 138irq_hw_number_t virq_to_hw(unsigned int virq)
159{ 139{
160 return irq_map[virq].hwirq; 140 struct irq_data *irq_data = irq_get_irq_data(virq);
141 return WARN_ON(!irq_data) ? 0 : irq_data->hwirq;
161} 142}
162EXPORT_SYMBOL_GPL(virq_to_hw); 143EXPORT_SYMBOL_GPL(virq_to_hw);
163
164bool virq_is_host(unsigned int virq, struct irq_host *host)
165{
166 return irq_map[virq].host == host;
167}
168EXPORT_SYMBOL_GPL(virq_is_host);
169
170static int default_irq_host_match(struct irq_host *h, struct device_node *np)
171{
172 return h->of_node != NULL && h->of_node == np;
173}
174
175struct irq_host *irq_alloc_host(struct device_node *of_node,
176 unsigned int revmap_type,
177 unsigned int revmap_arg,
178 struct irq_host_ops *ops,
179 irq_hw_number_t inval_irq)
180{
181 struct irq_host *host;
182 unsigned int size = sizeof(struct irq_host);
183 unsigned int i;
184 unsigned int *rmap;
185 unsigned long flags;
186
187 /* Allocate structure and revmap table if using linear mapping */
188 if (revmap_type == IRQ_HOST_MAP_LINEAR)
189 size += revmap_arg * sizeof(unsigned int);
190 host = kzalloc(size, GFP_KERNEL);
191 if (host == NULL)
192 return NULL;
193
194 /* Fill structure */
195 host->revmap_type = revmap_type;
196 host->inval_irq = inval_irq;
197 host->ops = ops;
198 host->of_node = of_node_get(of_node);
199
200 if (host->ops->match == NULL)
201 host->ops->match = default_irq_host_match;
202
203 raw_spin_lock_irqsave(&irq_big_lock, flags);
204
205 /* Check for the priority controller. */
206 if (revmap_type == IRQ_HOST_MAP_PRIORITY) {
207 if (irq_map[0].host != NULL) {
208 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
209 of_node_put(host->of_node);
210 kfree(host);
211 return NULL;
212 }
213 irq_map[0].host = host;
214 }
215
216 list_add(&host->link, &irq_hosts);
217 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
218
219 /* Additional setups per revmap type */
220 switch (revmap_type) {
221 case IRQ_HOST_MAP_PRIORITY:
222 /* 0 is always the invalid number for priority */
223 host->inval_irq = 0;
224 /* setup us as the host for all priority interrupts */
225 for (i = 1; i < NR_PRIORITY_IRQS; i++) {
226 irq_map[i].hwirq = i;
227 smp_wmb();
228 irq_map[i].host = host;
229 smp_wmb();
230
231 ops->map(host, i, i);
232 }
233 break;
234 case IRQ_HOST_MAP_LINEAR:
235 rmap = (unsigned int *)(host + 1);
236 for (i = 0; i < revmap_arg; i++)
237 rmap[i] = NO_IRQ;
238 host->revmap_data.linear.size = revmap_arg;
239 smp_wmb();
240 host->revmap_data.linear.revmap = rmap;
241 break;
242 case IRQ_HOST_MAP_TREE:
243 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
244 break;
245 default:
246 break;
247 }
248
249 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
250
251 return host;
252}
253
254struct irq_host *irq_find_host(struct device_node *node)
255{
256 struct irq_host *h, *found = NULL;
257 unsigned long flags;
258
259 /* We might want to match the legacy controller last since
260 * it might potentially be set to match all interrupts in
261 * the absence of a device node. This isn't a problem so far
262 * yet though...
263 */
264 raw_spin_lock_irqsave(&irq_big_lock, flags);
265 list_for_each_entry(h, &irq_hosts, link)
266 if (h->ops->match(h, node)) {
267 found = h;
268 break;
269 }
270 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
271 return found;
272}
273EXPORT_SYMBOL_GPL(irq_find_host);
274
275void irq_set_default_host(struct irq_host *host)
276{
277 pr_debug("irq: Default host set to @0x%p\n", host);
278
279 irq_default_host = host;
280}
281
282void irq_set_virq_count(unsigned int count)
283{
284 pr_debug("irq: Trying to set virq count to %d\n", count);
285
286 BUG_ON(count < NR_PRIORITY_IRQS);
287 if (count < NR_IRQS)
288 irq_virq_count = count;
289}
290
291static int irq_setup_virq(struct irq_host *host, unsigned int virq,
292 irq_hw_number_t hwirq)
293{
294 int res;
295
296 res = irq_alloc_desc_at(virq, 0);
297 if (res != virq) {
298 pr_debug("irq: -> allocating desc failed\n");
299 goto error;
300 }
301
302 /* map it */
303 smp_wmb();
304 irq_map[virq].hwirq = hwirq;
305 smp_mb();
306
307 if (host->ops->map(host, virq, hwirq)) {
308 pr_debug("irq: -> mapping failed, freeing\n");
309 goto errdesc;
310 }
311
312 irq_clear_status_flags(virq, IRQ_NOREQUEST);
313
314 return 0;
315
316errdesc:
317 irq_free_descs(virq, 1);
318error:
319 irq_free_virt(virq, 1);
320 return -1;
321}
322
323unsigned int irq_create_direct_mapping(struct irq_host *host)
324{
325 unsigned int virq;
326
327 if (host == NULL)
328 host = irq_default_host;
329
330 BUG_ON(host == NULL);
331 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
332
333 virq = irq_alloc_virt(host, 1, 0);
334 if (virq == NO_IRQ) {
335 pr_debug("irq: create_direct virq allocation failed\n");
336 return NO_IRQ;
337 }
338
339 pr_debug("irq: create_direct obtained virq %d\n", virq);
340
341 if (irq_setup_virq(host, virq, virq))
342 return NO_IRQ;
343
344 return virq;
345}
346
347unsigned int irq_create_mapping(struct irq_host *host,
348 irq_hw_number_t hwirq)
349{
350 unsigned int virq, hint;
351
352 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
353
354 /* Look for default host if nececssary */
355 if (host == NULL)
356 host = irq_default_host;
357 if (host == NULL) {
358 printk(KERN_WARNING "irq_create_mapping called for"
359 " NULL host, hwirq=%lx\n", hwirq);
360 WARN_ON(1);
361 return NO_IRQ;
362 }
363 pr_debug("irq: -> using host @%p\n", host);
364
365 /* Check if mapping already exists */
366 virq = irq_find_mapping(host, hwirq);
367 if (virq != NO_IRQ) {
368 pr_debug("irq: -> existing mapping on virq %d\n", virq);
369 return virq;
370 }
371
372 /* Allocate a virtual interrupt number */
373 hint = hwirq % irq_virq_count;
374 virq = irq_alloc_virt(host, 1, hint);
375 if (virq == NO_IRQ) {
376 pr_debug("irq: -> virq allocation failed\n");
377 return NO_IRQ;
378 }
379
380 if (irq_setup_virq(host, virq, hwirq))
381 return NO_IRQ;
382
383 pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
384 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
385
386 return virq;
387}
388EXPORT_SYMBOL_GPL(irq_create_mapping);
389
390unsigned int irq_create_of_mapping(struct device_node *controller,
391 const u32 *intspec, unsigned int intsize)
392{
393 struct irq_host *host;
394 irq_hw_number_t hwirq;
395 unsigned int type = IRQ_TYPE_NONE;
396 unsigned int virq;
397
398 if (controller == NULL)
399 host = irq_default_host;
400 else
401 host = irq_find_host(controller);
402 if (host == NULL) {
403 printk(KERN_WARNING "irq: no irq host found for %s !\n",
404 controller->full_name);
405 return NO_IRQ;
406 }
407
408 /* If host has no translation, then we assume interrupt line */
409 if (host->ops->xlate == NULL)
410 hwirq = intspec[0];
411 else {
412 if (host->ops->xlate(host, controller, intspec, intsize,
413 &hwirq, &type))
414 return NO_IRQ;
415 }
416
417 /* Create mapping */
418 virq = irq_create_mapping(host, hwirq);
419 if (virq == NO_IRQ)
420 return virq;
421
422 /* Set type if specified and different than the current one */
423 if (type != IRQ_TYPE_NONE &&
424 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
425 irq_set_irq_type(virq, type);
426 return virq;
427}
428EXPORT_SYMBOL_GPL(irq_create_of_mapping);
429
430void irq_dispose_mapping(unsigned int virq)
431{
432 struct irq_host *host;
433 irq_hw_number_t hwirq;
434
435 if (virq == NO_IRQ)
436 return;
437
438 /* Never unmap priority interrupts */
439 if (virq < NR_PRIORITY_IRQS)
440 return;
441
442 host = irq_map[virq].host;
443 if (WARN_ON(host == NULL))
444 return;
445
446 irq_set_status_flags(virq, IRQ_NOREQUEST);
447
448 /* remove chip and handler */
449 irq_set_chip_and_handler(virq, NULL, NULL);
450
451 /* Make sure it's completed */
452 synchronize_irq(virq);
453
454 /* Tell the PIC about it */
455 if (host->ops->unmap)
456 host->ops->unmap(host, virq);
457 smp_mb();
458
459 /* Clear reverse map */
460 hwirq = irq_map[virq].hwirq;
461 switch (host->revmap_type) {
462 case IRQ_HOST_MAP_LINEAR:
463 if (hwirq < host->revmap_data.linear.size)
464 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
465 break;
466 case IRQ_HOST_MAP_TREE:
467 mutex_lock(&revmap_trees_mutex);
468 radix_tree_delete(&host->revmap_data.tree, hwirq);
469 mutex_unlock(&revmap_trees_mutex);
470 break;
471 }
472
473 /* Destroy map */
474 smp_mb();
475 irq_map[virq].hwirq = host->inval_irq;
476
477 irq_free_descs(virq, 1);
478 /* Free it */
479 irq_free_virt(virq, 1);
480}
481EXPORT_SYMBOL_GPL(irq_dispose_mapping);
482
483unsigned int irq_find_mapping(struct irq_host *host,
484 irq_hw_number_t hwirq)
485{
486 unsigned int i;
487 unsigned int hint = hwirq % irq_virq_count;
488
489 /* Look for default host if nececssary */
490 if (host == NULL)
491 host = irq_default_host;
492 if (host == NULL)
493 return NO_IRQ;
494
495 /* Slow path does a linear search of the map */
496 i = hint;
497 do {
498 if (irq_map[i].host == host &&
499 irq_map[i].hwirq == hwirq)
500 return i;
501 i++;
502 if (i >= irq_virq_count)
503 i = 4;
504 } while (i != hint);
505 return NO_IRQ;
506}
507EXPORT_SYMBOL_GPL(irq_find_mapping);
508
509unsigned int irq_radix_revmap_lookup(struct irq_host *host,
510 irq_hw_number_t hwirq)
511{
512 struct irq_map_entry *ptr;
513 unsigned int virq;
514
515 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
516 return irq_find_mapping(host, hwirq);
517
518 /*
519 * The ptr returned references the static global irq_map.
520 * but freeing an irq can delete nodes along the path to
521 * do the lookup via call_rcu.
522 */
523 rcu_read_lock();
524 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
525 rcu_read_unlock();
526
527 /*
528 * If found in radix tree, then fine.
529 * Else fallback to linear lookup - this should not happen in practice
530 * as it means that we failed to insert the node in the radix tree.
531 */
532 if (ptr)
533 virq = ptr - irq_map;
534 else
535 virq = irq_find_mapping(host, hwirq);
536
537 return virq;
538}
539
540void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
541 irq_hw_number_t hwirq)
542{
543 if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
544 return;
545
546 if (virq != NO_IRQ) {
547 mutex_lock(&revmap_trees_mutex);
548 radix_tree_insert(&host->revmap_data.tree, hwirq,
549 &irq_map[virq]);
550 mutex_unlock(&revmap_trees_mutex);
551 }
552}
553
554unsigned int irq_linear_revmap(struct irq_host *host,
555 irq_hw_number_t hwirq)
556{
557 unsigned int *revmap;
558
559 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
560 return irq_find_mapping(host, hwirq);
561
562 /* Check revmap bounds */
563 if (unlikely(hwirq >= host->revmap_data.linear.size))
564 return irq_find_mapping(host, hwirq);
565
566 /* Check if revmap was allocated */
567 revmap = host->revmap_data.linear.revmap;
568 if (unlikely(revmap == NULL))
569 return irq_find_mapping(host, hwirq);
570
571 /* Fill up revmap with slow path if no mapping found */
572 if (unlikely(revmap[hwirq] == NO_IRQ))
573 revmap[hwirq] = irq_find_mapping(host, hwirq);
574
575 return revmap[hwirq];
576}
577
578unsigned int irq_alloc_virt(struct irq_host *host,
579 unsigned int count,
580 unsigned int hint)
581{
582 unsigned long flags;
583 unsigned int i, j, found = NO_IRQ;
584
585 if (count == 0 || count > (irq_virq_count - NR_PRIORITY_IRQS))
586 return NO_IRQ;
587
588 raw_spin_lock_irqsave(&irq_big_lock, flags);
589
590 /* Use hint for 1 interrupt if any */
591 if (count == 1 && hint >= NR_PRIORITY_IRQS &&
592 hint < irq_virq_count && irq_map[hint].host == NULL) {
593 found = hint;
594 goto hint_found;
595 }
596
597 /* Look for count consecutive numbers in the allocatable
598 * (non-legacy) space
599 */
600 for (i = NR_PRIORITY_IRQS, j = 0; i < irq_virq_count; i++) {
601 if (irq_map[i].host != NULL)
602 j = 0;
603 else
604 j++;
605
606 if (j == count) {
607 found = i - count + 1;
608 break;
609 }
610 }
611 if (found == NO_IRQ) {
612 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
613 return NO_IRQ;
614 }
615 hint_found:
616 for (i = found; i < (found + count); i++) {
617 irq_map[i].hwirq = host->inval_irq;
618 smp_wmb();
619 irq_map[i].host = host;
620 }
621 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
622 return found;
623}
624
625void irq_free_virt(unsigned int virq, unsigned int count)
626{
627 unsigned long flags;
628 unsigned int i;
629
630 WARN_ON(virq < NR_PRIORITY_IRQS);
631 WARN_ON(count == 0 || (virq + count) > irq_virq_count);
632
633 if (virq < NR_PRIORITY_IRQS) {
634 if (virq + count < NR_PRIORITY_IRQS)
635 return;
636 count -= NR_PRIORITY_IRQS - virq;
637 virq = NR_PRIORITY_IRQS;
638 }
639
640 if (count > irq_virq_count || virq > irq_virq_count - count) {
641 if (virq > irq_virq_count)
642 return;
643 count = irq_virq_count - virq;
644 }
645
646 raw_spin_lock_irqsave(&irq_big_lock, flags);
647 for (i = virq; i < (virq + count); i++) {
648 struct irq_host *host;
649
650 host = irq_map[i].host;
651 irq_map[i].hwirq = host->inval_irq;
652 smp_wmb();
653 irq_map[i].host = NULL;
654 }
655 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
656}
657
658#ifdef CONFIG_VIRQ_DEBUG
659static int virq_debug_show(struct seq_file *m, void *private)
660{
661 unsigned long flags;
662 struct irq_desc *desc;
663 const char *p;
664 static const char none[] = "none";
665 void *data;
666 int i;
667
668 seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
669 "chip name", "chip data", "host name");
670
671 for (i = 1; i < nr_irqs; i++) {
672 desc = irq_to_desc(i);
673 if (!desc)
674 continue;
675
676 raw_spin_lock_irqsave(&desc->lock, flags);
677
678 if (desc->action && desc->action->handler) {
679 struct irq_chip *chip;
680
681 seq_printf(m, "%5d ", i);
682 seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
683
684 chip = irq_desc_get_chip(desc);
685 if (chip && chip->name)
686 p = chip->name;
687 else
688 p = none;
689 seq_printf(m, "%-15s ", p);
690
691 data = irq_desc_get_chip_data(desc);
692 seq_printf(m, "0x%16p ", data);
693
694 if (irq_map[i].host && irq_map[i].host->of_node)
695 p = irq_map[i].host->of_node->full_name;
696 else
697 p = none;
698 seq_printf(m, "%s\n", p);
699 }
700
701 raw_spin_unlock_irqrestore(&desc->lock, flags);
702 }
703
704 return 0;
705}
706
707static int virq_debug_open(struct inode *inode, struct file *file)
708{
709 return single_open(file, virq_debug_show, inode->i_private);
710}
711
712static const struct file_operations virq_debug_fops = {
713 .open = virq_debug_open,
714 .read = seq_read,
715 .llseek = seq_lseek,
716 .release = single_release,
717};
718
719static int __init irq_debugfs_init(void)
720{
721 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
722 NULL, &virq_debug_fops) == NULL)
723 return -ENOMEM;
724
725 return 0;
726}
727device_initcall(irq_debugfs_init);
728#endif /* CONFIG_VIRQ_DEBUG */
diff --git a/arch/c6x/platforms/megamod-pic.c b/arch/c6x/platforms/megamod-pic.c
index 7c37a947fb1c..61f5863f1b1d 100644
--- a/arch/c6x/platforms/megamod-pic.c
+++ b/arch/c6x/platforms/megamod-pic.c
@@ -48,7 +48,7 @@ struct megamod_regs {
48}; 48};
49 49
50struct megamod_pic { 50struct megamod_pic {
51 struct irq_host *irqhost; 51 struct irq_domain *irqhost;
52 struct megamod_regs __iomem *regs; 52 struct megamod_regs __iomem *regs;
53 raw_spinlock_t lock; 53 raw_spinlock_t lock;
54 54
@@ -116,7 +116,7 @@ static void megamod_irq_cascade(unsigned int irq, struct irq_desc *desc)
116 } 116 }
117} 117}
118 118
119static int megamod_map(struct irq_host *h, unsigned int virq, 119static int megamod_map(struct irq_domain *h, unsigned int virq,
120 irq_hw_number_t hw) 120 irq_hw_number_t hw)
121{ 121{
122 struct megamod_pic *pic = h->host_data; 122 struct megamod_pic *pic = h->host_data;
@@ -136,7 +136,7 @@ static int megamod_map(struct irq_host *h, unsigned int virq,
136 return 0; 136 return 0;
137} 137}
138 138
139static int megamod_xlate(struct irq_host *h, struct device_node *ct, 139static int megamod_xlate(struct irq_domain *h, struct device_node *ct,
140 const u32 *intspec, unsigned int intsize, 140 const u32 *intspec, unsigned int intsize,
141 irq_hw_number_t *out_hwirq, unsigned int *out_type) 141 irq_hw_number_t *out_hwirq, unsigned int *out_type)
142 142
@@ -148,7 +148,7 @@ static int megamod_xlate(struct irq_host *h, struct device_node *ct,
148 return 0; 148 return 0;
149} 149}
150 150
151static struct irq_host_ops megamod_host_ops = { 151static struct irq_domain_ops megamod_domain_ops = {
152 .map = megamod_map, 152 .map = megamod_map,
153 .xlate = megamod_xlate, 153 .xlate = megamod_xlate,
154}; 154};
@@ -223,9 +223,8 @@ static struct megamod_pic * __init init_megamod_pic(struct device_node *np)
223 return NULL; 223 return NULL;
224 } 224 }
225 225
226 pic->irqhost = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, 226 pic->irqhost = irq_domain_add_linear(np, NR_COMBINERS * 32,
227 NR_COMBINERS * 32, &megamod_host_ops, 227 &megamod_domain_ops, pic);
228 IRQ_UNMAPPED);
229 if (!pic->irqhost) { 228 if (!pic->irqhost) {
230 pr_err("%s: Could not alloc host.\n", np->full_name); 229 pr_err("%s: Could not alloc host.\n", np->full_name);
231 goto error_free; 230 goto error_free;
generated by cgit v1.2.2 (git 2.25.0) at 2026-05-11 14:47:55 -0400