Pull acpi_device_handle_cleanup into release branch
[linux-2.6] / 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/ide.h>
34 #include <linux/irq.h>
35 #include <linux/spinlock.h>
36
37 #include <asm/paca.h>
38 #include <asm/iseries/hv_types.h>
39 #include <asm/iseries/hv_lp_event.h>
40 #include <asm/iseries/hv_call_xm.h>
41 #include <asm/iseries/it_lp_queue.h>
42
43 #include "irq.h"
44 #include "pci.h"
45 #include "call_pci.h"
46
47 #if defined(CONFIG_SMP)
48 extern void iSeries_smp_message_recv(struct pt_regs *);
49 #endif
50
51 #ifdef CONFIG_PCI
52
53 enum pci_event_type {
54         pe_bus_created          = 0,    /* PHB has been created */
55         pe_bus_error            = 1,    /* PHB has failed */
56         pe_bus_failed           = 2,    /* Msg to Secondary, Primary failed bus */
57         pe_node_failed          = 4,    /* Multi-adapter bridge has failed */
58         pe_node_recovered       = 5,    /* Multi-adapter bridge has recovered */
59         pe_bus_recovered        = 12,   /* PHB has been recovered */
60         pe_unquiese_bus         = 18,   /* Secondary bus unqiescing */
61         pe_bridge_error         = 21,   /* Bridge Error */
62         pe_slot_interrupt       = 22    /* Slot interrupt */
63 };
64
65 struct pci_event {
66         struct HvLpEvent event;
67         union {
68                 u64 __align;            /* Align on an 8-byte boundary */
69                 struct {
70                         u32             fisr;
71                         HvBusNumber     bus_number;
72                         HvSubBusNumber  sub_bus_number;
73                         HvAgentId       dev_id;
74                 } slot;
75                 struct {
76                         HvBusNumber     bus_number;
77                         HvSubBusNumber  sub_bus_number;
78                 } bus;
79                 struct {
80                         HvBusNumber     bus_number;
81                         HvSubBusNumber  sub_bus_number;
82                         HvAgentId       dev_id;
83                 } node;
84         } data;
85 };
86
87 static DEFINE_SPINLOCK(pending_irqs_lock);
88 static int num_pending_irqs;
89 static int pending_irqs[NR_IRQS];
90
91 static void int_received(struct pci_event *event, struct pt_regs *regs)
92 {
93         int irq;
94
95         switch (event->event.xSubtype) {
96         case pe_slot_interrupt:
97                 irq = event->event.xCorrelationToken;
98                 if (irq < NR_IRQS) {
99                         spin_lock(&pending_irqs_lock);
100                         pending_irqs[irq]++;
101                         num_pending_irqs++;
102                         spin_unlock(&pending_irqs_lock);
103                 } else {
104                         printk(KERN_WARNING "int_received: bad irq number %d\n",
105                                         irq);
106                         HvCallPci_eoi(event->data.slot.bus_number,
107                                         event->data.slot.sub_bus_number,
108                                         event->data.slot.dev_id);
109                 }
110                 break;
111                 /* Ignore error recovery events for now */
112         case pe_bus_created:
113                 printk(KERN_INFO "int_received: system bus %d created\n",
114                         event->data.bus.bus_number);
115                 break;
116         case pe_bus_error:
117         case pe_bus_failed:
118                 printk(KERN_INFO "int_received: system bus %d failed\n",
119                         event->data.bus.bus_number);
120                 break;
121         case pe_bus_recovered:
122         case pe_unquiese_bus:
123                 printk(KERN_INFO "int_received: system bus %d recovered\n",
124                         event->data.bus.bus_number);
125                 break;
126         case pe_node_failed:
127         case pe_bridge_error:
128                 printk(KERN_INFO
129                         "int_received: multi-adapter bridge %d/%d/%d failed\n",
130                         event->data.node.bus_number,
131                         event->data.node.sub_bus_number,
132                         event->data.node.dev_id);
133                 break;
134         case pe_node_recovered:
135                 printk(KERN_INFO
136                         "int_received: multi-adapter bridge %d/%d/%d recovered\n",
137                         event->data.node.bus_number,
138                         event->data.node.sub_bus_number,
139                         event->data.node.dev_id);
140                 break;
141         default:
142                 printk(KERN_ERR
143                         "int_received: unrecognized event subtype 0x%x\n",
144                         event->event.xSubtype);
145                 break;
146         }
147 }
148
149 static void pci_event_handler(struct HvLpEvent *event, struct pt_regs *regs)
150 {
151         if (event && (event->xType == HvLpEvent_Type_PciIo)) {
152                 if (hvlpevent_is_int(event))
153                         int_received((struct pci_event *)event, regs);
154                 else
155                         printk(KERN_ERR
156                                 "pci_event_handler: unexpected ack received\n");
157         } else if (event)
158                 printk(KERN_ERR
159                         "pci_event_handler: Unrecognized PCI event type 0x%x\n",
160                         (int)event->xType);
161         else
162                 printk(KERN_ERR "pci_event_handler: NULL event received\n");
163 }
164
165 /*
166  * This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c
167  * It must be called before the bus walk.
168  */
169 void __init iSeries_init_IRQ(void)
170 {
171         /* Register PCI event handler and open an event path */
172         int ret;
173
174         ret = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
175                         &pci_event_handler);
176         if (ret == 0) {
177                 ret = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
178                 if (ret != 0)
179                         printk(KERN_ERR "iseries_init_IRQ: open event path "
180                                         "failed with rc 0x%x\n", ret);
181         } else
182                 printk(KERN_ERR "iseries_init_IRQ: register handler "
183                                 "failed with rc 0x%x\n", ret);
184 }
185
186 #define REAL_IRQ_TO_SUBBUS(irq) (((irq) >> 14) & 0xff)
187 #define REAL_IRQ_TO_BUS(irq)    ((((irq) >> 6) & 0xff) + 1)
188 #define REAL_IRQ_TO_IDSEL(irq)  ((((irq) >> 3) & 7) + 1)
189 #define REAL_IRQ_TO_FUNC(irq)   ((irq) & 7)
190
191 /*
192  * This will be called by device drivers (via enable_IRQ)
193  * to enable INTA in the bridge interrupt status register.
194  */
195 static void iseries_enable_IRQ(unsigned int irq)
196 {
197         u32 bus, dev_id, function, mask;
198         const u32 sub_bus = 0;
199         unsigned int rirq = virt_irq_to_real_map[irq];
200
201         /* The IRQ has already been locked by the caller */
202         bus = REAL_IRQ_TO_BUS(rirq);
203         function = REAL_IRQ_TO_FUNC(rirq);
204         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
205
206         /* Unmask secondary INTA */
207         mask = 0x80000000;
208         HvCallPci_unmaskInterrupts(bus, sub_bus, dev_id, mask);
209 }
210
211 /* This is called by iseries_activate_IRQs */
212 static unsigned int iseries_startup_IRQ(unsigned int irq)
213 {
214         u32 bus, dev_id, function, mask;
215         const u32 sub_bus = 0;
216         unsigned int rirq = virt_irq_to_real_map[irq];
217
218         bus = REAL_IRQ_TO_BUS(rirq);
219         function = REAL_IRQ_TO_FUNC(rirq);
220         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
221
222         /* Link the IRQ number to the bridge */
223         HvCallXm_connectBusUnit(bus, sub_bus, dev_id, irq);
224
225         /* Unmask bridge interrupts in the FISR */
226         mask = 0x01010000 << function;
227         HvCallPci_unmaskFisr(bus, sub_bus, dev_id, mask);
228         iseries_enable_IRQ(irq);
229         return 0;
230 }
231
232 /*
233  * This is called out of iSeries_fixup to activate interrupt
234  * generation for usable slots
235  */
236 void __init iSeries_activate_IRQs()
237 {
238         int irq;
239         unsigned long flags;
240
241         for_each_irq (irq) {
242                 irq_desc_t *desc = get_irq_desc(irq);
243
244                 if (desc && desc->chip && desc->chip->startup) {
245                         spin_lock_irqsave(&desc->lock, flags);
246                         desc->chip->startup(irq);
247                         spin_unlock_irqrestore(&desc->lock, flags);
248                 }
249         }
250 }
251
252 /*  this is not called anywhere currently */
253 static void iseries_shutdown_IRQ(unsigned int irq)
254 {
255         u32 bus, dev_id, function, mask;
256         const u32 sub_bus = 0;
257         unsigned int rirq = virt_irq_to_real_map[irq];
258
259         /* irq should be locked by the caller */
260         bus = REAL_IRQ_TO_BUS(rirq);
261         function = REAL_IRQ_TO_FUNC(rirq);
262         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
263
264         /* Invalidate the IRQ number in the bridge */
265         HvCallXm_connectBusUnit(bus, sub_bus, dev_id, 0);
266
267         /* Mask bridge interrupts in the FISR */
268         mask = 0x01010000 << function;
269         HvCallPci_maskFisr(bus, sub_bus, dev_id, mask);
270 }
271
272 /*
273  * This will be called by device drivers (via disable_IRQ)
274  * to disable INTA in the bridge interrupt status register.
275  */
276 static void iseries_disable_IRQ(unsigned int irq)
277 {
278         u32 bus, dev_id, function, mask;
279         const u32 sub_bus = 0;
280         unsigned int rirq = virt_irq_to_real_map[irq];
281
282         /* The IRQ has already been locked by the caller */
283         bus = REAL_IRQ_TO_BUS(rirq);
284         function = REAL_IRQ_TO_FUNC(rirq);
285         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
286
287         /* Mask secondary INTA   */
288         mask = 0x80000000;
289         HvCallPci_maskInterrupts(bus, sub_bus, dev_id, mask);
290 }
291
292 static void iseries_end_IRQ(unsigned int irq)
293 {
294         unsigned int rirq = virt_irq_to_real_map[irq];
295
296         HvCallPci_eoi(REAL_IRQ_TO_BUS(rirq), REAL_IRQ_TO_SUBBUS(rirq),
297                 (REAL_IRQ_TO_IDSEL(rirq) << 4) + REAL_IRQ_TO_FUNC(rirq));
298 }
299
300 static hw_irq_controller iSeries_IRQ_handler = {
301         .typename = "iSeries irq controller",
302         .startup = iseries_startup_IRQ,
303         .shutdown = iseries_shutdown_IRQ,
304         .enable = iseries_enable_IRQ,
305         .disable = iseries_disable_IRQ,
306         .end = iseries_end_IRQ
307 };
308
309 /*
310  * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
311  * It calculates the irq value for the slot.
312  * Note that sub_bus is always 0 (at the moment at least).
313  */
314 int __init iSeries_allocate_IRQ(HvBusNumber bus,
315                 HvSubBusNumber sub_bus, u32 bsubbus)
316 {
317         int virtirq;
318         unsigned int realirq;
319         u8 idsel = ISERIES_GET_DEVICE_FROM_SUBBUS(bsubbus);
320         u8 function = ISERIES_GET_FUNCTION_FROM_SUBBUS(bsubbus);
321
322         realirq = (((((sub_bus << 8) + (bus - 1)) << 3) + (idsel - 1)) << 3)
323                 + function;
324         virtirq = virt_irq_create_mapping(realirq);
325
326         irq_desc[virtirq].chip = &iSeries_IRQ_handler;
327         return virtirq;
328 }
329
330 #endif /* CONFIG_PCI */
331
332 /*
333  * Get the next pending IRQ.
334  */
335 int iSeries_get_irq(struct pt_regs *regs)
336 {
337         /* -2 means ignore this interrupt */
338         int irq = -2;
339
340 #ifdef CONFIG_SMP
341         if (get_lppaca()->int_dword.fields.ipi_cnt) {
342                 get_lppaca()->int_dword.fields.ipi_cnt = 0;
343                 iSeries_smp_message_recv(regs);
344         }
345 #endif /* CONFIG_SMP */
346         if (hvlpevent_is_pending())
347                 process_hvlpevents(regs);
348
349 #ifdef CONFIG_PCI
350         if (num_pending_irqs) {
351                 spin_lock(&pending_irqs_lock);
352                 for (irq = 0; irq < NR_IRQS; irq++) {
353                         if (pending_irqs[irq]) {
354                                 pending_irqs[irq]--;
355                                 num_pending_irqs--;
356                                 break;
357                         }
358                 }
359                 spin_unlock(&pending_irqs_lock);
360                 if (irq >= NR_IRQS)
361                         irq = -2;
362         }
363 #endif
364
365         return irq;
366 }