blob: f7d088b897ee384f849081e92851ac08fd4ea164 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Interrupt management for most GSC and related devices.
3 *
4 * (c) Copyright 1999 Alex deVries for The Puffin Group
5 * (c) Copyright 1999 Grant Grundler for Hewlett-Packard
6 * (c) Copyright 1999 Matthew Wilcox
7 * (c) Copyright 2000 Helge Deller
8 * (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/ioport.h>
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24
25#include <asm/hardware.h>
26#include <asm/io.h>
27
28#include "gsc.h"
29
30#undef DEBUG
31
32#ifdef DEBUG
33#define DEBPRINTK printk
34#else
35#define DEBPRINTK(x,...)
36#endif
37
38int gsc_alloc_irq(struct gsc_irq *i)
39{
40 int irq = txn_alloc_irq(GSC_EIM_WIDTH);
41 if (irq < 0) {
42 printk("cannot get irq\n");
43 return irq;
44 }
45
46 i->txn_addr = txn_alloc_addr(irq);
47 i->txn_data = txn_alloc_data(irq);
48 i->irq = irq;
49
50 return irq;
51}
52
53int gsc_claim_irq(struct gsc_irq *i, int irq)
54{
55 int c = irq;
56
57 irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
58
59 irq = txn_claim_irq(irq);
60 if (irq < 0) {
61 printk("cannot claim irq %d\n", c);
62 return irq;
63 }
64
65 i->txn_addr = txn_alloc_addr(irq);
66 i->txn_data = txn_alloc_data(irq);
67 i->irq = irq;
68
69 return irq;
70}
71
72EXPORT_SYMBOL(gsc_alloc_irq);
73EXPORT_SYMBOL(gsc_claim_irq);
74
75/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
David Howells7d12e782006-10-05 14:55:46 +010076irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
78 unsigned long irr;
79 struct gsc_asic *gsc_asic = dev;
80
81 irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
82 if (irr == 0)
83 return IRQ_NONE;
84
85 DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
86
87 do {
88 int local_irq = __ffs(irr);
89 unsigned int irq = gsc_asic->global_irq[local_irq];
David Howells7d12e782006-10-05 14:55:46 +010090 __do_IRQ(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 irr &= ~(1 << local_irq);
92 } while (irr);
93
94 return IRQ_HANDLED;
95}
96
97int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
98{
99 int local_irq;
100
101 for (local_irq = 0; local_irq < limit; local_irq++) {
102 if (global_irqs[local_irq] == irq)
103 return local_irq;
104 }
105
106 return NO_IRQ;
107}
108
109static void gsc_asic_disable_irq(unsigned int irq)
110{
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700111 struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
113 u32 imr;
114
Harvey Harrisona8043ec2008-05-14 16:21:56 -0700115 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 irq_dev->name, imr);
117
118 /* Disable the IRQ line by clearing the bit in the IMR */
119 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
120 imr &= ~(1 << local_irq);
121 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
122}
123
124static void gsc_asic_enable_irq(unsigned int irq)
125{
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700126 struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
128 u32 imr;
129
Harvey Harrisona8043ec2008-05-14 16:21:56 -0700130 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 irq_dev->name, imr);
132
133 /* Enable the IRQ line by setting the bit in the IMR */
134 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
135 imr |= 1 << local_irq;
136 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
137 /*
138 * FIXME: read IPR to make sure the IRQ isn't already pending.
139 * If so, we need to read IRR and manually call do_irq().
140 */
141}
142
143static unsigned int gsc_asic_startup_irq(unsigned int irq)
144{
145 gsc_asic_enable_irq(irq);
146 return 0;
147}
148
149static struct hw_interrupt_type gsc_asic_interrupt_type = {
150 .typename = "GSC-ASIC",
151 .startup = gsc_asic_startup_irq,
152 .shutdown = gsc_asic_disable_irq,
153 .enable = gsc_asic_enable_irq,
154 .disable = gsc_asic_disable_irq,
155 .ack = no_ack_irq,
156 .end = no_end_irq,
157};
158
159int gsc_assign_irq(struct hw_interrupt_type *type, void *data)
160{
161 static int irq = GSC_IRQ_BASE;
162
163 if (irq > GSC_IRQ_MAX)
164 return NO_IRQ;
165
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700166 irq_desc[irq].chip = type;
167 irq_desc[irq].chip_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return irq++;
169}
170
171void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
172{
173 int irq = asic->global_irq[local_irq];
174
175 if (irq <= 0) {
176 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
177 if (irq == NO_IRQ)
178 return;
179
180 asic->global_irq[local_irq] = irq;
181 }
182 *irqp = irq;
183}
184
Matthew Wilcox56583742005-10-21 22:33:38 -0400185static struct device *next_device(struct klist_iter *i)
186{
187 struct klist_node * n = klist_next(i);
188 return n ? container_of(n, struct device, knode_parent) : NULL;
189}
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
192 void (*choose_irq)(struct parisc_device *, void *))
193{
194 struct device *dev;
Matthew Wilcox56583742005-10-21 22:33:38 -0400195 struct klist_iter i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Matthew Wilcox56583742005-10-21 22:33:38 -0400197 klist_iter_init(&parent->dev.klist_children, &i);
198 while ((dev = next_device(&i))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct parisc_device *padev = to_parisc_device(dev);
200
201 /* work-around for 715/64 and others which have parent
202 at path [5] and children at path [5/0/x] */
203 if (padev->id.hw_type == HPHW_FAULTY)
204 return gsc_fixup_irqs(padev, ctrl, choose_irq);
205 choose_irq(padev, ctrl);
206 }
Matthew Wilcox56583742005-10-21 22:33:38 -0400207 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208}
209
210int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
211{
212 struct resource *res;
213 int i;
214
215 gsc_asic->gsc = parent;
216
217 /* Initialise local irq -> global irq mapping */
218 for (i = 0; i < 32; i++) {
219 gsc_asic->global_irq[i] = NO_IRQ;
220 }
221
222 /* allocate resource region */
223 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
224 if (res) {
225 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
226 }
227
228#if 0
229 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
230 parent->irq, gsc_asic->eim);
231 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
232 printk(" IMR is non-zero! (0x%x)",
233 gsc_readl(gsc_asic->hpa + OFFSET_IMR));
234 printk("\n");
235#endif
236
237 return 0;
238}
239
240extern struct parisc_driver lasi_driver;
241extern struct parisc_driver asp_driver;
242extern struct parisc_driver wax_driver;
243
244void __init gsc_init(void)
245{
246#ifdef CONFIG_GSC_LASI
247 register_parisc_driver(&lasi_driver);
248 register_parisc_driver(&asp_driver);
249#endif
250#ifdef CONFIG_GSC_WAX
251 register_parisc_driver(&wax_driver);
252#endif
253}