powerpc: Convert to new irq_* function names
[linux-2.6.git] / arch / powerpc / platforms / iseries / irq.c
1 /*
2  * This module supports the iSeries PCI bus interrupt handling
3  * Copyright (C) 20yy  <Robert L Holtorf> <IBM Corp>
4  * Copyright (C) 2004-2005 IBM Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the:
18  * Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330,
20  * Boston, MA  02111-1307  USA
21  *
22  * Change Activity:
23  *   Created, December 13, 2000 by Wayne Holm
24  * End Change Activity
25  */
26 #include <linux/pci.h>
27 #include <linux/init.h>
28 #include <linux/threads.h>
29 #include <linux/smp.h>
30 #include <linux/param.h>
31 #include <linux/string.h>
32 #include <linux/bootmem.h>
33 #include <linux/irq.h>
34 #include <linux/spinlock.h>
35
36 #include <asm/paca.h>
37 #include <asm/iseries/hv_types.h>
38 #include <asm/iseries/hv_lp_event.h>
39 #include <asm/iseries/hv_call_xm.h>
40 #include <asm/iseries/it_lp_queue.h>
41
42 #include "irq.h"
43 #include "pci.h"
44 #include "call_pci.h"
45 #include "smp.h"
46
47 #ifdef CONFIG_PCI
48
49 enum pci_event_type {
50         pe_bus_created          = 0,    /* PHB has been created */
51         pe_bus_error            = 1,    /* PHB has failed */
52         pe_bus_failed           = 2,    /* Msg to Secondary, Primary failed bus */
53         pe_node_failed          = 4,    /* Multi-adapter bridge has failed */
54         pe_node_recovered       = 5,    /* Multi-adapter bridge has recovered */
55         pe_bus_recovered        = 12,   /* PHB has been recovered */
56         pe_unquiese_bus         = 18,   /* Secondary bus unqiescing */
57         pe_bridge_error         = 21,   /* Bridge Error */
58         pe_slot_interrupt       = 22    /* Slot interrupt */
59 };
60
61 struct pci_event {
62         struct HvLpEvent event;
63         union {
64                 u64 __align;            /* Align on an 8-byte boundary */
65                 struct {
66                         u32             fisr;
67                         HvBusNumber     bus_number;
68                         HvSubBusNumber  sub_bus_number;
69                         HvAgentId       dev_id;
70                 } slot;
71                 struct {
72                         HvBusNumber     bus_number;
73                         HvSubBusNumber  sub_bus_number;
74                 } bus;
75                 struct {
76                         HvBusNumber     bus_number;
77                         HvSubBusNumber  sub_bus_number;
78                         HvAgentId       dev_id;
79                 } node;
80         } data;
81 };
82
83 static DEFINE_SPINLOCK(pending_irqs_lock);
84 static int num_pending_irqs;
85 static int pending_irqs[NR_IRQS];
86
87 static void int_received(struct pci_event *event)
88 {
89         int irq;
90
91         switch (event->event.xSubtype) {
92         case pe_slot_interrupt:
93                 irq = event->event.xCorrelationToken;
94                 if (irq < NR_IRQS) {
95                         spin_lock(&pending_irqs_lock);
96                         pending_irqs[irq]++;
97                         num_pending_irqs++;
98                         spin_unlock(&pending_irqs_lock);
99                 } else {
100                         printk(KERN_WARNING "int_received: bad irq number %d\n",
101                                         irq);
102                         HvCallPci_eoi(event->data.slot.bus_number,
103                                         event->data.slot.sub_bus_number,
104                                         event->data.slot.dev_id);
105                 }
106                 break;
107                 /* Ignore error recovery events for now */
108         case pe_bus_created:
109                 printk(KERN_INFO "int_received: system bus %d created\n",
110                         event->data.bus.bus_number);
111                 break;
112         case pe_bus_error:
113         case pe_bus_failed:
114                 printk(KERN_INFO "int_received: system bus %d failed\n",
115                         event->data.bus.bus_number);
116                 break;
117         case pe_bus_recovered:
118         case pe_unquiese_bus:
119                 printk(KERN_INFO "int_received: system bus %d recovered\n",
120                         event->data.bus.bus_number);
121                 break;
122         case pe_node_failed:
123         case pe_bridge_error:
124                 printk(KERN_INFO
125                         "int_received: multi-adapter bridge %d/%d/%d failed\n",
126                         event->data.node.bus_number,
127                         event->data.node.sub_bus_number,
128                         event->data.node.dev_id);
129                 break;
130         case pe_node_recovered:
131                 printk(KERN_INFO
132                         "int_received: multi-adapter bridge %d/%d/%d recovered\n",
133                         event->data.node.bus_number,
134                         event->data.node.sub_bus_number,
135                         event->data.node.dev_id);
136                 break;
137         default:
138                 printk(KERN_ERR
139                         "int_received: unrecognized event subtype 0x%x\n",
140                         event->event.xSubtype);
141                 break;
142         }
143 }
144
145 static void pci_event_handler(struct HvLpEvent *event)
146 {
147         if (event && (event->xType == HvLpEvent_Type_PciIo)) {
148                 if (hvlpevent_is_int(event))
149                         int_received((struct pci_event *)event);
150                 else
151                         printk(KERN_ERR
152                                 "pci_event_handler: unexpected ack received\n");
153         } else if (event)
154                 printk(KERN_ERR
155                         "pci_event_handler: Unrecognized PCI event type 0x%x\n",
156                         (int)event->xType);
157         else
158                 printk(KERN_ERR "pci_event_handler: NULL event received\n");
159 }
160
161 #define REAL_IRQ_TO_SUBBUS(irq) (((irq) >> 14) & 0xff)
162 #define REAL_IRQ_TO_BUS(irq)    ((((irq) >> 6) & 0xff) + 1)
163 #define REAL_IRQ_TO_IDSEL(irq)  ((((irq) >> 3) & 7) + 1)
164 #define REAL_IRQ_TO_FUNC(irq)   ((irq) & 7)
165
166 /*
167  * This will be called by device drivers (via enable_IRQ)
168  * to enable INTA in the bridge interrupt status register.
169  */
170 static void iseries_enable_IRQ(struct irq_data *d)
171 {
172         u32 bus, dev_id, function, mask;
173         const u32 sub_bus = 0;
174         unsigned int rirq = (unsigned int)irq_map[d->irq].hwirq;
175
176         /* The IRQ has already been locked by the caller */
177         bus = REAL_IRQ_TO_BUS(rirq);
178         function = REAL_IRQ_TO_FUNC(rirq);
179         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
180
181         /* Unmask secondary INTA */
182         mask = 0x80000000;
183         HvCallPci_unmaskInterrupts(bus, sub_bus, dev_id, mask);
184 }
185
186 /* This is called by iseries_activate_IRQs */
187 static unsigned int iseries_startup_IRQ(struct irq_data *d)
188 {
189         u32 bus, dev_id, function, mask;
190         const u32 sub_bus = 0;
191         unsigned int rirq = (unsigned int)irq_map[d->irq].hwirq;
192
193         bus = REAL_IRQ_TO_BUS(rirq);
194         function = REAL_IRQ_TO_FUNC(rirq);
195         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
196
197         /* Link the IRQ number to the bridge */
198         HvCallXm_connectBusUnit(bus, sub_bus, dev_id, d->irq);
199
200         /* Unmask bridge interrupts in the FISR */
201         mask = 0x01010000 << function;
202         HvCallPci_unmaskFisr(bus, sub_bus, dev_id, mask);
203         iseries_enable_IRQ(d);
204         return 0;
205 }
206
207 /*
208  * This is called out of iSeries_fixup to activate interrupt
209  * generation for usable slots
210  */
211 void __init iSeries_activate_IRQs()
212 {
213         int irq;
214         unsigned long flags;
215
216         for_each_irq (irq) {
217                 struct irq_desc *desc = irq_to_desc(irq);
218                 struct irq_chip *chip;
219
220                 if (!desc)
221                         continue;
222
223                 chip = irq_desc_get_chip(desc);
224                 if (chip && chip->irq_startup) {
225                         raw_spin_lock_irqsave(&desc->lock, flags);
226                         chip->irq_startup(&desc->irq_data);
227                         raw_spin_unlock_irqrestore(&desc->lock, flags);
228                 }
229         }
230 }
231
232 /*  this is not called anywhere currently */
233 static void iseries_shutdown_IRQ(struct irq_data *d)
234 {
235         u32 bus, dev_id, function, mask;
236         const u32 sub_bus = 0;
237         unsigned int rirq = (unsigned int)irq_map[d->irq].hwirq;
238
239         /* irq should be locked by the caller */
240         bus = REAL_IRQ_TO_BUS(rirq);
241         function = REAL_IRQ_TO_FUNC(rirq);
242         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
243
244         /* Invalidate the IRQ number in the bridge */
245         HvCallXm_connectBusUnit(bus, sub_bus, dev_id, 0);
246
247         /* Mask bridge interrupts in the FISR */
248         mask = 0x01010000 << function;
249         HvCallPci_maskFisr(bus, sub_bus, dev_id, mask);
250 }
251
252 /*
253  * This will be called by device drivers (via disable_IRQ)
254  * to disable INTA in the bridge interrupt status register.
255  */
256 static void iseries_disable_IRQ(struct irq_data *d)
257 {
258         u32 bus, dev_id, function, mask;
259         const u32 sub_bus = 0;
260         unsigned int rirq = (unsigned int)irq_map[d->irq].hwirq;
261
262         /* The IRQ has already been locked by the caller */
263         bus = REAL_IRQ_TO_BUS(rirq);
264         function = REAL_IRQ_TO_FUNC(rirq);
265         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
266
267         /* Mask secondary INTA   */
268         mask = 0x80000000;
269         HvCallPci_maskInterrupts(bus, sub_bus, dev_id, mask);
270 }
271
272 static void iseries_end_IRQ(struct irq_data *d)
273 {
274         unsigned int rirq = (unsigned int)irq_map[d->irq].hwirq;
275
276         HvCallPci_eoi(REAL_IRQ_TO_BUS(rirq), REAL_IRQ_TO_SUBBUS(rirq),
277                 (REAL_IRQ_TO_IDSEL(rirq) << 4) + REAL_IRQ_TO_FUNC(rirq));
278 }
279
280 static struct irq_chip iseries_pic = {
281         .name           = "iSeries",
282         .irq_startup    = iseries_startup_IRQ,
283         .irq_shutdown   = iseries_shutdown_IRQ,
284         .irq_unmask     = iseries_enable_IRQ,
285         .irq_mask       = iseries_disable_IRQ,
286         .irq_eoi        = iseries_end_IRQ
287 };
288
289 /*
290  * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
291  * It calculates the irq value for the slot.
292  * Note that sub_bus is always 0 (at the moment at least).
293  */
294 int __init iSeries_allocate_IRQ(HvBusNumber bus,
295                 HvSubBusNumber sub_bus, u32 bsubbus)
296 {
297         unsigned int realirq;
298         u8 idsel = ISERIES_GET_DEVICE_FROM_SUBBUS(bsubbus);
299         u8 function = ISERIES_GET_FUNCTION_FROM_SUBBUS(bsubbus);
300
301         realirq = (((((sub_bus << 8) + (bus - 1)) << 3) + (idsel - 1)) << 3)
302                 + function;
303
304         return irq_create_mapping(NULL, realirq);
305 }
306
307 #endif /* CONFIG_PCI */
308
309 /*
310  * Get the next pending IRQ.
311  */
312 unsigned int iSeries_get_irq(void)
313 {
314         int irq = NO_IRQ_IGNORE;
315
316 #ifdef CONFIG_SMP
317         if (get_lppaca()->int_dword.fields.ipi_cnt) {
318                 get_lppaca()->int_dword.fields.ipi_cnt = 0;
319                 iSeries_smp_message_recv();
320         }
321 #endif /* CONFIG_SMP */
322         if (hvlpevent_is_pending())
323                 process_hvlpevents();
324
325 #ifdef CONFIG_PCI
326         if (num_pending_irqs) {
327                 spin_lock(&pending_irqs_lock);
328                 for (irq = 0; irq < NR_IRQS; irq++) {
329                         if (pending_irqs[irq]) {
330                                 pending_irqs[irq]--;
331                                 num_pending_irqs--;
332                                 break;
333                         }
334                 }
335                 spin_unlock(&pending_irqs_lock);
336                 if (irq >= NR_IRQS)
337                         irq = NO_IRQ_IGNORE;
338         }
339 #endif
340
341         return irq;
342 }
343
344 #ifdef CONFIG_PCI
345
346 static int iseries_irq_host_map(struct irq_host *h, unsigned int virq,
347                                 irq_hw_number_t hw)
348 {
349         irq_set_chip_and_handler(virq, &iseries_pic, handle_fasteoi_irq);
350
351         return 0;
352 }
353
354 static int iseries_irq_host_match(struct irq_host *h, struct device_node *np)
355 {
356         /* Match all */
357         return 1;
358 }
359
360 static struct irq_host_ops iseries_irq_host_ops = {
361         .map = iseries_irq_host_map,
362         .match = iseries_irq_host_match,
363 };
364
365 /*
366  * This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c
367  * It must be called before the bus walk.
368  */
369 void __init iSeries_init_IRQ(void)
370 {
371         /* Register PCI event handler and open an event path */
372         struct irq_host *host;
373         int ret;
374
375         /*
376          * The Hypervisor only allows us up to 256 interrupt
377          * sources (the irq number is passed in a u8).
378          */
379         irq_set_virq_count(256);
380
381         /* Create irq host. No need for a revmap since HV will give us
382          * back our virtual irq number
383          */
384         host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0,
385                               &iseries_irq_host_ops, 0);
386         BUG_ON(host == NULL);
387         irq_set_default_host(host);
388
389         ret = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
390                         &pci_event_handler);
391         if (ret == 0) {
392                 ret = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
393                 if (ret != 0)
394                         printk(KERN_ERR "iseries_init_IRQ: open event path "
395                                         "failed with rc 0x%x\n", ret);
396         } else
397                 printk(KERN_ERR "iseries_init_IRQ: register handler "
398                                 "failed with rc 0x%x\n", ret);
399 }
400
401 #endif  /* CONFIG_PCI */