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-rw-r--r--arch/powerpc/platforms/iseries/irq.c400
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diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
new file mode 100644
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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
46#ifdef CONFIG_PCI
47
48enum pci_event_type {
49 pe_bus_created = 0, /* PHB has been created */
50 pe_bus_error = 1, /* PHB has failed */
51 pe_bus_failed = 2, /* Msg to Secondary, Primary failed bus */
52 pe_node_failed = 4, /* Multi-adapter bridge has failed */
53 pe_node_recovered = 5, /* Multi-adapter bridge has recovered */
54 pe_bus_recovered = 12, /* PHB has been recovered */
55 pe_unquiese_bus = 18, /* Secondary bus unqiescing */
56 pe_bridge_error = 21, /* Bridge Error */
57 pe_slot_interrupt = 22 /* Slot interrupt */
58};
59
60struct pci_event {
61 struct HvLpEvent event;
62 union {
63 u64 __align; /* Align on an 8-byte boundary */
64 struct {
65 u32 fisr;
66 HvBusNumber bus_number;
67 HvSubBusNumber sub_bus_number;
68 HvAgentId dev_id;
69 } slot;
70 struct {
71 HvBusNumber bus_number;
72 HvSubBusNumber sub_bus_number;
73 } bus;
74 struct {
75 HvBusNumber bus_number;
76 HvSubBusNumber sub_bus_number;
77 HvAgentId dev_id;
78 } node;
79 } data;
80};
81
82static DEFINE_SPINLOCK(pending_irqs_lock);
83static int num_pending_irqs;
84static int pending_irqs[NR_IRQS];
85
86static void int_received(struct pci_event *event)
87{
88 int irq;
89
90 switch (event->event.xSubtype) {
91 case pe_slot_interrupt:
92 irq = event->event.xCorrelationToken;
93 if (irq < NR_IRQS) {
94 spin_lock(&pending_irqs_lock);
95 pending_irqs[irq]++;
96 num_pending_irqs++;
97 spin_unlock(&pending_irqs_lock);
98 } else {
99 printk(KERN_WARNING "int_received: bad irq number %d\n",
100 irq);
101 HvCallPci_eoi(event->data.slot.bus_number,
102 event->data.slot.sub_bus_number,
103 event->data.slot.dev_id);
104 }
105 break;
106 /* Ignore error recovery events for now */
107 case pe_bus_created:
108 printk(KERN_INFO "int_received: system bus %d created\n",
109 event->data.bus.bus_number);
110 break;
111 case pe_bus_error:
112 case pe_bus_failed:
113 printk(KERN_INFO "int_received: system bus %d failed\n",
114 event->data.bus.bus_number);
115 break;
116 case pe_bus_recovered:
117 case pe_unquiese_bus:
118 printk(KERN_INFO "int_received: system bus %d recovered\n",
119 event->data.bus.bus_number);
120 break;
121 case pe_node_failed:
122 case pe_bridge_error:
123 printk(KERN_INFO
124 "int_received: multi-adapter bridge %d/%d/%d failed\n",
125 event->data.node.bus_number,
126 event->data.node.sub_bus_number,
127 event->data.node.dev_id);
128 break;
129 case pe_node_recovered:
130 printk(KERN_INFO
131 "int_received: multi-adapter bridge %d/%d/%d recovered\n",
132 event->data.node.bus_number,
133 event->data.node.sub_bus_number,
134 event->data.node.dev_id);
135 break;
136 default:
137 printk(KERN_ERR
138 "int_received: unrecognized event subtype 0x%x\n",
139 event->event.xSubtype);
140 break;
141 }
142}
143
144static void pci_event_handler(struct HvLpEvent *event)
145{
146 if (event && (event->xType == HvLpEvent_Type_PciIo)) {
147 if (hvlpevent_is_int(event))
148 int_received((struct pci_event *)event);
149 else
150 printk(KERN_ERR
151 "pci_event_handler: unexpected ack received\n");
152 } else if (event)
153 printk(KERN_ERR
154 "pci_event_handler: Unrecognized PCI event type 0x%x\n",
155 (int)event->xType);
156 else
157 printk(KERN_ERR "pci_event_handler: NULL event received\n");
158}
159
160#define REAL_IRQ_TO_SUBBUS(irq) (((irq) >> 14) & 0xff)
161#define REAL_IRQ_TO_BUS(irq) ((((irq) >> 6) & 0xff) + 1)
162#define REAL_IRQ_TO_IDSEL(irq) ((((irq) >> 3) & 7) + 1)
163#define REAL_IRQ_TO_FUNC(irq) ((irq) & 7)
164
165/*
166 * This will be called by device drivers (via enable_IRQ)
167 * to enable INTA in the bridge interrupt status register.
168 */
169static void iseries_enable_IRQ(struct irq_data *d)
170{
171 u32 bus, dev_id, function, mask;
172 const u32 sub_bus = 0;
173 unsigned int rirq = (unsigned int)irqd_to_hwirq(d);
174
175 /* The IRQ has already been locked by the caller */
176 bus = REAL_IRQ_TO_BUS(rirq);
177 function = REAL_IRQ_TO_FUNC(rirq);
178 dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
179
180 /* Unmask secondary INTA */
181 mask = 0x80000000;
182 HvCallPci_unmaskInterrupts(bus, sub_bus, dev_id, mask);
183}
184
185/* This is called by iseries_activate_IRQs */
186static unsigned int iseries_startup_IRQ(struct irq_data *d)
187{
188 u32 bus, dev_id, function, mask;
189 const u32 sub_bus = 0;
190 unsigned int rirq = (unsigned int)irqd_to_hwirq(d);
191
192 bus = REAL_IRQ_TO_BUS(rirq);
193 function = REAL_IRQ_TO_FUNC(rirq);
194 dev_id = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function;
195
196 /* Link the IRQ number to the bridge */
197 HvCallXm_connectBusUnit(bus, sub_bus, dev_id, d->irq);
198
199 /* Unmask bridge interrupts in the FISR */
200 mask = 0x01010000 << function;
201 HvCallPci_unmaskFisr(bus, sub_bus, dev_id, mask);
202 iseries_enable_IRQ(d);
203 return 0;
204}
205
206/*
207 * This is called out of iSeries_fixup to activate interrupt
208 * generation for usable slots
209 */