a06603d84a451147d0cd646c40d18d9ef172bc94
[karo-tx-linux.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/config.h>
27 #include <linux/pci.h>
28 #include <linux/init.h>
29 #include <linux/threads.h>
30 #include <linux/smp.h>
31 #include <linux/param.h>
32 #include <linux/string.h>
33 #include <linux/bootmem.h>
34 #include <linux/ide.h>
35 #include <linux/irq.h>
36 #include <linux/spinlock.h>
37
38 #include <asm/iseries/hv_types.h>
39 #include <asm/iseries/hv_lp_event.h>
40 #include <asm/iseries/hv_call_xm.h>
41
42 #include "irq.h"
43 #include "call_pci.h"
44
45 /* This maps virtual irq numbers to real irqs */
46 unsigned int virt_irq_to_real_map[NR_IRQS];
47
48 /* The next available virtual irq number */
49 /* Note: the pcnet32 driver assumes irq numbers < 2 aren't valid. :( */
50 static int next_virtual_irq = 2;
51
52 static long Pci_Interrupt_Count;
53 static long Pci_Event_Count;
54
55 enum XmPciLpEvent_Subtype {
56         XmPciLpEvent_BusCreated         = 0,    // PHB has been created
57         XmPciLpEvent_BusError           = 1,    // PHB has failed
58         XmPciLpEvent_BusFailed          = 2,    // Msg to Secondary, Primary failed bus
59         XmPciLpEvent_NodeFailed         = 4,    // Multi-adapter bridge has failed
60         XmPciLpEvent_NodeRecovered      = 5,    // Multi-adapter bridge has recovered
61         XmPciLpEvent_BusRecovered       = 12,   // PHB has been recovered
62         XmPciLpEvent_UnQuiesceBus       = 18,   // Secondary bus unqiescing
63         XmPciLpEvent_BridgeError        = 21,   // Bridge Error
64         XmPciLpEvent_SlotInterrupt      = 22    // Slot interrupt
65 };
66
67 struct XmPciLpEvent_BusInterrupt {
68         HvBusNumber     busNumber;
69         HvSubBusNumber  subBusNumber;
70 };
71
72 struct XmPciLpEvent_NodeInterrupt {
73         HvBusNumber     busNumber;
74         HvSubBusNumber  subBusNumber;
75         HvAgentId       deviceId;
76 };
77
78 struct XmPciLpEvent {
79         struct HvLpEvent hvLpEvent;
80
81         union {
82                 u64 alignData;                  // Align on an 8-byte boundary
83
84                 struct {
85                         u32             fisr;
86                         HvBusNumber     busNumber;
87                         HvSubBusNumber  subBusNumber;
88                         HvAgentId       deviceId;
89                 } slotInterrupt;
90
91                 struct XmPciLpEvent_BusInterrupt busFailed;
92                 struct XmPciLpEvent_BusInterrupt busRecovered;
93                 struct XmPciLpEvent_BusInterrupt busCreated;
94
95                 struct XmPciLpEvent_NodeInterrupt nodeFailed;
96                 struct XmPciLpEvent_NodeInterrupt nodeRecovered;
97
98         } eventData;
99
100 };
101
102 static void intReceived(struct XmPciLpEvent *eventParm,
103                 struct pt_regs *regsParm)
104 {
105         int irq;
106
107         ++Pci_Interrupt_Count;
108
109         switch (eventParm->hvLpEvent.xSubtype) {
110         case XmPciLpEvent_SlotInterrupt:
111                 irq = eventParm->hvLpEvent.xCorrelationToken;
112                 /* Dispatch the interrupt handlers for this irq */
113                 ppc_irq_dispatch_handler(regsParm, irq);
114                 HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
115                         eventParm->eventData.slotInterrupt.subBusNumber,
116                         eventParm->eventData.slotInterrupt.deviceId);
117                 break;
118                 /* Ignore error recovery events for now */
119         case XmPciLpEvent_BusCreated:
120                 printk(KERN_INFO "intReceived: system bus %d created\n",
121                         eventParm->eventData.busCreated.busNumber);
122                 break;
123         case XmPciLpEvent_BusError:
124         case XmPciLpEvent_BusFailed:
125                 printk(KERN_INFO "intReceived: system bus %d failed\n",
126                         eventParm->eventData.busFailed.busNumber);
127                 break;
128         case XmPciLpEvent_BusRecovered:
129         case XmPciLpEvent_UnQuiesceBus:
130                 printk(KERN_INFO "intReceived: system bus %d recovered\n",
131                         eventParm->eventData.busRecovered.busNumber);
132                 break;
133         case XmPciLpEvent_NodeFailed:
134         case XmPciLpEvent_BridgeError:
135                 printk(KERN_INFO
136                         "intReceived: multi-adapter bridge %d/%d/%d failed\n",
137                         eventParm->eventData.nodeFailed.busNumber,
138                         eventParm->eventData.nodeFailed.subBusNumber,
139                         eventParm->eventData.nodeFailed.deviceId);
140                 break;
141         case XmPciLpEvent_NodeRecovered:
142                 printk(KERN_INFO
143                         "intReceived: multi-adapter bridge %d/%d/%d recovered\n",
144                         eventParm->eventData.nodeRecovered.busNumber,
145                         eventParm->eventData.nodeRecovered.subBusNumber,
146                         eventParm->eventData.nodeRecovered.deviceId);
147                 break;
148         default:
149                 printk(KERN_ERR
150                         "intReceived: unrecognized event subtype 0x%x\n",
151                         eventParm->hvLpEvent.xSubtype);
152                 break;
153         }
154 }
155
156 static void XmPciLpEvent_handler(struct HvLpEvent *eventParm,
157                 struct pt_regs *regsParm)
158 {
159 #ifdef CONFIG_PCI
160         ++Pci_Event_Count;
161
162         if (eventParm && (eventParm->xType == HvLpEvent_Type_PciIo)) {
163                 switch (eventParm->xFlags.xFunction) {
164                 case HvLpEvent_Function_Int:
165                         intReceived((struct XmPciLpEvent *)eventParm, regsParm);
166                         break;
167                 case HvLpEvent_Function_Ack:
168                         printk(KERN_ERR
169                                 "XmPciLpEvent_handler: unexpected ack received\n");
170                         break;
171                 default:
172                         printk(KERN_ERR
173                                 "XmPciLpEvent_handler: unexpected event function %d\n",
174                                 (int)eventParm->xFlags.xFunction);
175                         break;
176                 }
177         } else if (eventParm)
178                 printk(KERN_ERR
179                         "XmPciLpEvent_handler: Unrecognized PCI event type 0x%x\n",
180                         (int)eventParm->xType);
181         else
182                 printk(KERN_ERR "XmPciLpEvent_handler: NULL event received\n");
183 #endif
184 }
185
186 /*
187  * This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c
188  * It must be called before the bus walk.
189  */
190 void __init iSeries_init_IRQ(void)
191 {
192         /* Register PCI event handler and open an event path */
193         int xRc;
194
195         xRc = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
196                         &XmPciLpEvent_handler);
197         if (xRc == 0) {
198                 xRc = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
199                 if (xRc != 0)
200                         printk(KERN_ERR "iSeries_init_IRQ: open event path "
201                                         "failed with rc 0x%x\n", xRc);
202         } else
203                 printk(KERN_ERR "iSeries_init_IRQ: register handler "
204                                 "failed with rc 0x%x\n", xRc);
205 }
206
207 #define REAL_IRQ_TO_BUS(irq)    ((((irq) >> 6) & 0xff) + 1)
208 #define REAL_IRQ_TO_IDSEL(irq)  ((((irq) >> 3) & 7) + 1)
209 #define REAL_IRQ_TO_FUNC(irq)   ((irq) & 7)
210
211 /*
212  * This will be called by device drivers (via enable_IRQ)
213  * to enable INTA in the bridge interrupt status register.
214  */
215 static void iSeries_enable_IRQ(unsigned int irq)
216 {
217         u32 bus, deviceId, function, mask;
218         const u32 subBus = 0;
219         unsigned int rirq = virt_irq_to_real_map[irq];
220
221         /* The IRQ has already been locked by the caller */
222         bus = REAL_IRQ_TO_BUS(rirq);
223         function = REAL_IRQ_TO_FUNC(rirq);
224         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
225
226         /* Unmask secondary INTA */
227         mask = 0x80000000;
228         HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask);
229 }
230
231 /* This is called by iSeries_activate_IRQs */
232 static unsigned int iSeries_startup_IRQ(unsigned int irq)
233 {
234         u32 bus, deviceId, function, mask;
235         const u32 subBus = 0;
236         unsigned int rirq = virt_irq_to_real_map[irq];
237
238         bus = REAL_IRQ_TO_BUS(rirq);
239         function = REAL_IRQ_TO_FUNC(rirq);
240         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
241
242         /* Link the IRQ number to the bridge */
243         HvCallXm_connectBusUnit(bus, subBus, deviceId, irq);
244
245         /* Unmask bridge interrupts in the FISR */
246         mask = 0x01010000 << function;
247         HvCallPci_unmaskFisr(bus, subBus, deviceId, mask);
248         iSeries_enable_IRQ(irq);
249         return 0;
250 }
251
252 /*
253  * This is called out of iSeries_fixup to activate interrupt
254  * generation for usable slots
255  */
256 void __init iSeries_activate_IRQs()
257 {
258         int irq;
259         unsigned long flags;
260
261         for_each_irq (irq) {
262                 irq_desc_t *desc = get_irq_desc(irq);
263
264                 if (desc && desc->handler && desc->handler->startup) {
265                         spin_lock_irqsave(&desc->lock, flags);
266                         desc->handler->startup(irq);
267                         spin_unlock_irqrestore(&desc->lock, flags);
268                 }
269         }
270 }
271
272 /*  this is not called anywhere currently */
273 static void iSeries_shutdown_IRQ(unsigned int irq)
274 {
275         u32 bus, deviceId, function, mask;
276         const u32 subBus = 0;
277         unsigned int rirq = virt_irq_to_real_map[irq];
278
279         /* irq should be locked by the caller */
280         bus = REAL_IRQ_TO_BUS(rirq);
281         function = REAL_IRQ_TO_FUNC(rirq);
282         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
283
284         /* Invalidate the IRQ number in the bridge */
285         HvCallXm_connectBusUnit(bus, subBus, deviceId, 0);
286
287         /* Mask bridge interrupts in the FISR */
288         mask = 0x01010000 << function;
289         HvCallPci_maskFisr(bus, subBus, deviceId, mask);
290 }
291
292 /*
293  * This will be called by device drivers (via disable_IRQ)
294  * to disable INTA in the bridge interrupt status register.
295  */
296 static void iSeries_disable_IRQ(unsigned int irq)
297 {
298         u32 bus, deviceId, function, mask;
299         const u32 subBus = 0;
300         unsigned int rirq = virt_irq_to_real_map[irq];
301
302         /* The IRQ has already been locked by the caller */
303         bus = REAL_IRQ_TO_BUS(rirq);
304         function = REAL_IRQ_TO_FUNC(rirq);
305         deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
306
307         /* Mask secondary INTA   */
308         mask = 0x80000000;
309         HvCallPci_maskInterrupts(bus, subBus, deviceId, mask);
310 }
311
312 /*
313  * Need to define this so ppc_irq_dispatch_handler will NOT call
314  * enable_IRQ at the end of interrupt handling.  However, this does
315  * nothing because there is not enough information provided to do
316  * the EOI HvCall.  This is done by XmPciLpEvent.c
317  */
318 static void iSeries_end_IRQ(unsigned int irq)
319 {
320 }
321
322 static hw_irq_controller iSeries_IRQ_handler = {
323         .typename = "iSeries irq controller",
324         .startup = iSeries_startup_IRQ,
325         .shutdown = iSeries_shutdown_IRQ,
326         .enable = iSeries_enable_IRQ,
327         .disable = iSeries_disable_IRQ,
328         .end = iSeries_end_IRQ
329 };
330
331 /*
332  * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
333  * It calculates the irq value for the slot.
334  * Note that subBusNumber is always 0 (at the moment at least).
335  */
336 int __init iSeries_allocate_IRQ(HvBusNumber busNumber,
337                 HvSubBusNumber subBusNumber, HvAgentId deviceId)
338 {
339         unsigned int realirq, virtirq;
340         u8 idsel = (deviceId >> 4);
341         u8 function = deviceId & 7;
342
343         virtirq = next_virtual_irq++;
344         realirq = ((busNumber - 1) << 6) + ((idsel - 1) << 3) + function;
345         virt_irq_to_real_map[virtirq] = realirq;
346
347         irq_desc[virtirq].handler = &iSeries_IRQ_handler;
348         return virtirq;
349 }
350
351 int virt_irq_create_mapping(unsigned int real_irq)
352 {
353         BUG(); /* Don't call this on iSeries, yet */
354
355         return 0;
356 }
357
358 void virt_irq_init(void)
359 {
360         return;
361 }