summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/iseries/irq.c
blob: a58daa153686db64ca16a9fb4bc6b4f84a19ae7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
/*
 * This module supports the iSeries PCI bus interrupt handling
 * Copyright (C) 20yy  <Robert L Holtorf> <IBM Corp>
 * Copyright (C) 2004-2005 IBM Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the:
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330,
 * Boston, MA  02111-1307  USA
 *
 * Change Activity:
 *   Created, December 13, 2000 by Wayne Holm
 * End Change Activity
 */
#include <linux/config.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/bootmem.h>
#include <linux/ide.h>
#include <linux/irq.h>
#include <linux/spinlock.h>

#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/hv_call_xm.h>

#include "irq.h"
#include "call_pci.h"

static long Pci_Interrupt_Count;
static long Pci_Event_Count;

enum XmPciLpEvent_Subtype {
	XmPciLpEvent_BusCreated		= 0,	// PHB has been created
	XmPciLpEvent_BusError		= 1,	// PHB has failed
	XmPciLpEvent_BusFailed		= 2,	// Msg to Secondary, Primary failed bus
	XmPciLpEvent_NodeFailed		= 4,	// Multi-adapter bridge has failed
	XmPciLpEvent_NodeRecovered	= 5,	// Multi-adapter bridge has recovered
	XmPciLpEvent_BusRecovered	= 12,	// PHB has been recovered
	XmPciLpEvent_UnQuiesceBus	= 18,	// Secondary bus unqiescing
	XmPciLpEvent_BridgeError	= 21,	// Bridge Error
	XmPciLpEvent_SlotInterrupt	= 22	// Slot interrupt
};

struct XmPciLpEvent_BusInterrupt {
	HvBusNumber	busNumber;
	HvSubBusNumber	subBusNumber;
};

struct XmPciLpEvent_NodeInterrupt {
	HvBusNumber	busNumber;
	HvSubBusNumber	subBusNumber;
	HvAgentId	deviceId;
};

struct XmPciLpEvent {
	struct HvLpEvent hvLpEvent;

	union {
		u64 alignData;			// Align on an 8-byte boundary

		struct {
			u32		fisr;
			HvBusNumber	busNumber;
			HvSubBusNumber	subBusNumber;
			HvAgentId	deviceId;
		} slotInterrupt;

		struct XmPciLpEvent_BusInterrupt busFailed;
		struct XmPciLpEvent_BusInterrupt busRecovered;
		struct XmPciLpEvent_BusInterrupt busCreated;

		struct XmPciLpEvent_NodeInterrupt nodeFailed;
		struct XmPciLpEvent_NodeInterrupt nodeRecovered;

	} eventData;

};

static void intReceived(struct XmPciLpEvent *eventParm,
		struct pt_regs *regsParm)
{
	int irq;
#ifdef CONFIG_IRQSTACKS
	struct thread_info *curtp, *irqtp;
#endif

	++Pci_Interrupt_Count;

	switch (eventParm->hvLpEvent.xSubtype) {
	case XmPciLpEvent_SlotInterrupt:
		irq = eventParm->hvLpEvent.xCorrelationToken;
		/* Dispatch the interrupt handlers for this irq */
#ifdef CONFIG_IRQSTACKS
		/* Switch to the irq stack to handle this */
		curtp = current_thread_info();
		irqtp = hardirq_ctx[smp_processor_id()];
		if (curtp != irqtp) {
			irqtp->task = curtp->task;
			irqtp->flags = 0;
			call___do_IRQ(irq, regsParm, irqtp);
			irqtp->task = NULL;
			if (irqtp->flags)
				set_bits(irqtp->flags, &curtp->flags);
		} else
#endif
			__do_IRQ(irq, regsParm);
		HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
			eventParm->eventData.slotInterrupt.subBusNumber,
			eventParm->eventData.slotInterrupt.deviceId);
		break;
		/* Ignore error recovery events for now */
	case XmPciLpEvent_BusCreated:
		printk(KERN_INFO "intReceived: system bus %d created\n",
			eventParm->eventData.busCreated.busNumber);
		break;
	case XmPciLpEvent_BusError:
	case XmPciLpEvent_BusFailed:
		printk(KERN_INFO "intReceived: system bus %d failed\n",
			eventParm->eventData.busFailed.busNumber);
		break;
	case XmPciLpEvent_BusRecovered:
	case XmPciLpEvent_UnQuiesceBus:
		printk(KERN_INFO "intReceived: system bus %d recovered\n",
			eventParm->eventData.busRecovered.busNumber);
		break;
	case XmPciLpEvent_NodeFailed:
	case XmPciLpEvent_BridgeError:
		printk(KERN_INFO
			"intReceived: multi-adapter bridge %d/%d/%d failed\n",
			eventParm->eventData.nodeFailed.busNumber,
			eventParm->eventData.nodeFailed.subBusNumber,
			eventParm->eventData.nodeFailed.deviceId);
		break;
	case XmPciLpEvent_NodeRecovered:
		printk(KERN_INFO
			"intReceived: multi-adapter bridge %d/%d/%d recovered\n",
			eventParm->eventData.nodeRecovered.busNumber,
			eventParm->eventData.nodeRecovered.subBusNumber,
			eventParm->eventData.nodeRecovered.deviceId);
		break;
	default:
		printk(KERN_ERR
			"intReceived: unrecognized event subtype 0x%x\n",
			eventParm->hvLpEvent.xSubtype);
		break;
	}
}

static void XmPciLpEvent_handler(struct HvLpEvent *eventParm,
		struct pt_regs *regsParm)
{
#ifdef CONFIG_PCI
	++Pci_Event_Count;

	if (eventParm && (eventParm->xType == HvLpEvent_Type_PciIo)) {
		switch (eventParm->xFlags.xFunction) {
		case HvLpEvent_Function_Int:
			intReceived((struct XmPciLpEvent *)eventParm, regsParm);
			break;
		case HvLpEvent_Function_Ack:
			printk(KERN_ERR
				"XmPciLpEvent_handler: unexpected ack received\n");
			break;
		default:
			printk(KERN_ERR
				"XmPciLpEvent_handler: unexpected event function %d\n",
				(int)eventParm->xFlags.xFunction);
			break;
		}
	} else if (eventParm)
		printk(KERN_ERR
			"XmPciLpEvent_handler: Unrecognized PCI event type 0x%x\n",
			(int)eventParm->xType);
	else
		printk(KERN_ERR "XmPciLpEvent_handler: NULL event received\n");
#endif
}

/*
 * This is called by init_IRQ.  set in ppc_md.init_IRQ by iSeries_setup.c
 * It must be called before the bus walk.
 */
void __init iSeries_init_IRQ(void)
{
	/* Register PCI event handler and open an event path */
	int xRc;

	xRc = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo,
			&XmPciLpEvent_handler);
	if (xRc == 0) {
		xRc = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
		if (xRc != 0)
			printk(KERN_ERR "iSeries_init_IRQ: open event path "
					"failed with rc 0x%x\n", xRc);
	} else
		printk(KERN_ERR "iSeries_init_IRQ: register handler "
				"failed with rc 0x%x\n", xRc);
}

#define REAL_IRQ_TO_BUS(irq)	((((irq) >> 6) & 0xff) + 1)
#define REAL_IRQ_TO_IDSEL(irq)	((((irq) >> 3) & 7) + 1)
#define REAL_IRQ_TO_FUNC(irq)	((irq) & 7)

/*
 * This will be called by device drivers (via enable_IRQ)
 * to enable INTA in the bridge interrupt status register.
 */
static void iSeries_enable_IRQ(unsigned int irq)
{
	u32 bus, deviceId, function, mask;
	const u32 subBus = 0;
	unsigned int rirq = virt_irq_to_real_map[irq];

	/* The IRQ has already been locked by the caller */
	bus = REAL_IRQ_TO_BUS(rirq);
	function = REAL_IRQ_TO_FUNC(rirq);
	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Unmask secondary INTA */
	mask = 0x80000000;
	HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask);
}

/* This is called by iSeries_activate_IRQs */
static unsigned int iSeries_startup_IRQ(unsigned int irq)
{
	u32 bus, deviceId, function, mask;
	const u32 subBus = 0;
	unsigned int rirq = virt_irq_to_real_map[irq];

	bus = REAL_IRQ_TO_BUS(rirq);
	function = REAL_IRQ_TO_FUNC(rirq);
	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Link the IRQ number to the bridge */
	HvCallXm_connectBusUnit(bus, subBus, deviceId, irq);

	/* Unmask bridge interrupts in the FISR */
	mask = 0x01010000 << function;
	HvCallPci_unmaskFisr(bus, subBus, deviceId, mask);
	iSeries_enable_IRQ(irq);
	return 0;
}

/*
 * This is called out of iSeries_fixup to activate interrupt
 * generation for usable slots
 */
void __init iSeries_activate_IRQs()
{
	int irq;
	unsigned long flags;

	for_each_irq (irq) {
		irq_desc_t *desc = get_irq_desc(irq);

		if (desc && desc->handler && desc->handler->startup) {
			spin_lock_irqsave(&desc->lock, flags);
			desc->handler->startup(irq);
			spin_unlock_irqrestore(&desc->lock, flags);
		}
	}
}

/*  this is not called anywhere currently */
static void iSeries_shutdown_IRQ(unsigned int irq)
{
	u32 bus, deviceId, function, mask;
	const u32 subBus = 0;
	unsigned int rirq = virt_irq_to_real_map[irq];

	/* irq should be locked by the caller */
	bus = REAL_IRQ_TO_BUS(rirq);
	function = REAL_IRQ_TO_FUNC(rirq);
	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Invalidate the IRQ number in the bridge */
	HvCallXm_connectBusUnit(bus, subBus, deviceId, 0);

	/* Mask bridge interrupts in the FISR */
	mask = 0x01010000 << function;
	HvCallPci_maskFisr(bus, subBus, deviceId, mask);
}

/*
 * This will be called by device drivers (via disable_IRQ)
 * to disable INTA in the bridge interrupt status register.
 */
static void iSeries_disable_IRQ(unsigned int irq)
{
	u32 bus, deviceId, function, mask;
	const u32 subBus = 0;
	unsigned int rirq = virt_irq_to_real_map[irq];

	/* The IRQ has already been locked by the caller */
	bus = REAL_IRQ_TO_BUS(rirq);
	function = REAL_IRQ_TO_FUNC(rirq);
	deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;

	/* Mask secondary INTA   */
	mask = 0x80000000;
	HvCallPci_maskInterrupts(bus, subBus, deviceId, mask);
}

/*
 * This does nothing because there is not enough information
 * provided to do the EOI HvCall.  This is done by XmPciLpEvent.c
 */
static void iSeries_end_IRQ(unsigned int irq)
{
}

static hw_irq_controller iSeries_IRQ_handler = {
	.typename = "iSeries irq controller",
	.startup = iSeries_startup_IRQ,
	.shutdown = iSeries_shutdown_IRQ,
	.enable = iSeries_enable_IRQ,
	.disable = iSeries_disable_IRQ,
	.end = iSeries_end_IRQ
};

/*
 * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
 * It calculates the irq value for the slot.
 * Note that subBusNumber is always 0 (at the moment at least).
 */
int __init iSeries_allocate_IRQ(HvBusNumber busNumber,
		HvSubBusNumber subBusNumber, HvAgentId deviceId)
{
	int virtirq;
	unsigned int realirq;
	u8 idsel = (deviceId >> 4);
	u8 function = deviceId & 7;

	realirq = ((busNumber - 1) << 6) + ((idsel - 1) << 3) + function;
	virtirq = virt_irq_create_mapping(realirq);

	irq_desc[virtirq].handler = &iSeries_IRQ_handler;
	return virtirq;
}
OpenPOWER on IntegriCloud