[POWERPC] Add new interrupt mapping core and change platforms to use it
[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/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 #define REAL_IRQ_TO_SUBBUS(irq) (((irq) >> 14) & 0xff)
166 #define REAL_IRQ_TO_BUS(irq)    ((((irq) >> 6) & 0xff) + 1)
167 #define REAL_IRQ_TO_IDSEL(irq)  ((((irq) >> 3) & 7) + 1)
168 #define REAL_IRQ_TO_FUNC(irq)   ((irq) & 7)
169
170 /*
171  * This will be called by device drivers (via enable_IRQ)
172  * to enable INTA in the bridge interrupt status register.
173  */
174 static void iseries_enable_IRQ(unsigned int irq)
175 {
176         u32 bus, dev_id, function, mask;
177         const u32 sub_bus = 0;
178         unsigned int rirq = (unsigned int)irq_map[irq].hwirq;
179
180         /* The IRQ has already been locked by the caller */
181         bus = REAL_IRQ_TO_BUS(rirq);
182         function = REAL_IRQ_TO_FUNC(rirq);
183         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
184
185         /* Unmask secondary INTA */
186         mask = 0x80000000;
187         HvCallPci_unmaskInterrupts(bus, sub_bus, dev_id, mask);
188 }
189
190 /* This is called by iseries_activate_IRQs */
191 static unsigned int iseries_startup_IRQ(unsigned int irq)
192 {
193         u32 bus, dev_id, function, mask;
194         const u32 sub_bus = 0;
195         unsigned int rirq = (unsigned int)irq_map[irq].hwirq;
196
197         bus = REAL_IRQ_TO_BUS(rirq);
198         function = REAL_IRQ_TO_FUNC(rirq);
199         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
200
201         /* Link the IRQ number to the bridge */
202         HvCallXm_connectBusUnit(bus, sub_bus, dev_id, irq);
203
204         /* Unmask bridge interrupts in the FISR */
205         mask = 0x01010000 << function;
206         HvCallPci_unmaskFisr(bus, sub_bus, dev_id, mask);
207         iseries_enable_IRQ(irq);
208         return 0;
209 }
210
211 /*
212  * This is called out of iSeries_fixup to activate interrupt
213  * generation for usable slots
214  */
215 void __init iSeries_activate_IRQs()
216 {
217         int irq;
218         unsigned long flags;
219
220         for_each_irq (irq) {
221                 irq_desc_t *desc = get_irq_desc(irq);
222
223                 if (desc && desc->chip && desc->chip->startup) {
224                         spin_lock_irqsave(&desc->lock, flags);
225                         desc->chip->startup(irq);
226                         spin_unlock_irqrestore(&desc->lock, flags);
227                 }
228         }
229 }
230
231 /*  this is not called anywhere currently */
232 static void iseries_shutdown_IRQ(unsigned int irq)
233 {
234         u32 bus, dev_id, function, mask;
235         const u32 sub_bus = 0;
236         unsigned int rirq = (unsigned int)irq_map[irq].hwirq;
237
238         /* irq should be locked by the caller */
239         bus = REAL_IRQ_TO_BUS(rirq);
240         function = REAL_IRQ_TO_FUNC(rirq);
241         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
242
243         /* Invalidate the IRQ number in the bridge */
244         HvCallXm_connectBusUnit(bus, sub_bus, dev_id, 0);
245
246         /* Mask bridge interrupts in the FISR */
247         mask = 0x01010000 << function;
248         HvCallPci_maskFisr(bus, sub_bus, dev_id, mask);
249 }
250
251 /*
252  * This will be called by device drivers (via disable_IRQ)
253  * to disable INTA in the bridge interrupt status register.
254  */
255 static void iseries_disable_IRQ(unsigned int irq)
256 {
257         u32 bus, dev_id, function, mask;
258         const u32 sub_bus = 0;
259         unsigned int rirq = (unsigned int)irq_map[irq].hwirq;
260
261         /* The IRQ has already been locked by the caller */
262         bus = REAL_IRQ_TO_BUS(rirq);
263         function = REAL_IRQ_TO_FUNC(rirq);
264         dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
265
266         /* Mask secondary INTA   */
267         mask = 0x80000000;
268         HvCallPci_maskInterrupts(bus, sub_bus, dev_id, mask);
269 }
270
271 static void iseries_end_IRQ(unsigned int irq)
272 {
273         unsigned int rirq = (unsigned int)irq_map[irq].hwirq;
274
275         HvCallPci_eoi(REAL_IRQ_TO_BUS(rirq), REAL_IRQ_TO_SUBBUS(rirq),
276                 (REAL_IRQ_TO_IDSEL(rirq) << 4) + REAL_IRQ_TO_FUNC(rirq));
277 }
278
279 static struct irq_chip iseries_pic = {
280         .typename       = "iSeries irq controller",
281         .startup        = iseries_startup_IRQ,
282         .shutdown       = iseries_shutdown_IRQ,
283         .unmask         = iseries_enable_IRQ,
284         .mask           = iseries_disable_IRQ,
285         .eoi            = iseries_end_IRQ
286 };
287
288 /*
289  * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
290  * It calculates the irq value for the slot.
291  * Note that sub_bus is always 0 (at the moment at least).
292  */
293 int __init iSeries_allocate_IRQ(HvBusNumber bus,
294                 HvSubBusNumber sub_bus, u32 bsubbus)
295 {
296         unsigned int realirq;
297         u8 idsel = ISERIES_GET_DEVICE_FROM_SUBBUS(bsubbus);
298         u8 function = ISERIES_GET_FUNCTION_FROM_SUBBUS(bsubbus);
299
300         realirq = (((((sub_bus << 8) + (bus - 1)) << 3) + (idsel - 1)) << 3)
301                 + function;
302
303         return irq_create_mapping(NULL, realirq, IRQ_TYPE_NONE);
304 }
305
306 #endif /* CONFIG_PCI */
307
308 /*
309  * Get the next pending IRQ.
310  */
311 unsigned int iSeries_get_irq(struct pt_regs *regs)
312 {
313         int irq = NO_IRQ_IGNORE;
314
315 #ifdef CONFIG_SMP
316         if (get_lppaca()->int_dword.fields.ipi_cnt) {
317                 get_lppaca()->int_dword.fields.ipi_cnt = 0;
318                 iSeries_smp_message_recv(regs);
319         }
320 #endif /* CONFIG_SMP */
321         if (hvlpevent_is_pending())
322                 process_hvlpevents(regs);
323
324 #ifdef CONFIG_PCI
325         if (num_pending_irqs) {
326                 spin_lock(&pending_irqs_lock);
327                 for (irq = 0; irq < NR_IRQS; irq++) {
328                         if (pending_irqs[irq]) {
329                                 pending_irqs[irq]--;
330                                 num_pending_irqs--;
331                                 break;
332                         }
333                 }
334                 spin_unlock(&pending_irqs_lock);
335                 if (irq >= NR_IRQS)
336                         irq = NO_IRQ_IGNORE;
337         }
338 #endif
339
340         return irq;
341 }
342
343 static int iseries_irq_host_map(struct irq_host *h, unsigned int virq,
344                                 irq_hw_number_t hw, unsigned int flags)
345 {
346         set_irq_chip_and_handler(virq, &iseries_pic, handle_fasteoi_irq);
347
348         return 0;
349 }
350
351 static struct irq_host_ops iseries_irq_host_ops = {
352         .map = iseries_irq_host_map,
353 };
354
355 /*
356  * This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c
357  * It must be called before the bus walk.
358  */
359 void __init iSeries_init_IRQ(void)
360 {
361         /* Register PCI event handler and open an event path */
362         struct irq_host *host;
363         int ret;
364
365         /*
366          * The Hypervisor only allows us up to 256 interrupt
367          * sources (the irq number is passed in a u8).
368          */
369         irq_set_virq_count(256);
370
371         /* Create irq host. No need for a revmap since HV will give us
372          * back our virtual irq number
373          */
374         host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, 0, &iseries_irq_host_ops, 0);
375         BUG_ON(host == NULL);
376         irq_set_default_host(host);
377
378         ret = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
379                         &pci_event_handler);
380         if (ret == 0) {
381                 ret = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
382                 if (ret != 0)
383                         printk(KERN_ERR "iseries_init_IRQ: open event path "
384                                         "failed with rc 0x%x\n", ret);
385         } else
386                 printk(KERN_ERR "iseries_init_IRQ: register handler "
387                                 "failed with rc 0x%x\n", ret);
388 }
389