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1/*
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>
17#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/types.h>
23
24#include <asm/hardware.h>
25#include <asm/io.h>
26
27#include "gsc.h"
28
29#undef DEBUG
30
31#ifdef DEBUG
32#define DEBPRINTK printk
33#else
34#define DEBPRINTK(x,...)
35#endif
36
37int gsc_alloc_irq(struct gsc_irq *i)
38{
39 int irq = txn_alloc_irq(GSC_EIM_WIDTH);
40 if (irq < 0) {
41 printk("cannot get irq\n");
42 return irq;
43 }
44
45 i->txn_addr = txn_alloc_addr(irq);
46 i->txn_data = txn_alloc_data(irq);
47 i->irq = irq;
48
49 return irq;
50}
51
52int gsc_claim_irq(struct gsc_irq *i, int irq)
53{
54 int c = irq;
55
56 irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
57
58 irq = txn_claim_irq(irq);
59 if (irq < 0) {
60 printk("cannot claim irq %d\n", c);
61 return irq;
62 }
63
64 i->txn_addr = txn_alloc_addr(irq);
65 i->txn_data = txn_alloc_data(irq);
66 i->irq = irq;
67
68 return irq;
69}
70
71EXPORT_SYMBOL(gsc_alloc_irq);
72EXPORT_SYMBOL(gsc_claim_irq);
73
74/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
75irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
76{
77 unsigned long irr;
78 struct gsc_asic *gsc_asic = dev;
79
80 irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
81 if (irr == 0)
82 return IRQ_NONE;
83
84 DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
85
86 do {
87 int local_irq = __ffs(irr);
88 unsigned int irq = gsc_asic->global_irq[local_irq];
89 generic_handle_irq(irq);
90 irr &= ~(1 << local_irq);
91 } while (irr);
92
93 return IRQ_HANDLED;
94}
95
96int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
97{
98 int local_irq;
99
100 for (local_irq = 0; local_irq < limit; local_irq++) {
101 if (global_irqs[local_irq] == irq)
102 return local_irq;
103 }
104
105 return NO_IRQ;
106}
107
108static void gsc_asic_mask_irq(struct irq_data *d)
109{
110 struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
111 int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
112 u32 imr;
113
114 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
115 irq_dev->name, imr);
116
117 /* Disable the IRQ line by clearing the bit in the IMR */
118 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
119 imr &= ~(1 << local_irq);
120 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
121}
122
123static void gsc_asic_unmask_irq(struct irq_data *d)
124{
125 struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
126 int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
127 u32 imr;
128
129 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
130 irq_dev->name, imr);
131
132 /* Enable the IRQ line by setting the bit in the IMR */
133 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
134 imr |= 1 << local_irq;
135 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
136 /*
137 * FIXME: read IPR to make sure the IRQ isn't already pending.
138 * If so, we need to read IRR and manually call do_irq().
139 */
140}
141
142static struct irq_chip gsc_asic_interrupt_type = {
143 .name = "GSC-ASIC",
144 .irq_unmask = gsc_asic_unmask_irq,
145 .irq_mask = gsc_asic_mask_irq,
146};
147
148int gsc_assign_irq(struct irq_chip *type, void *data)
149{
150 static int irq = GSC_IRQ_BASE;
151
152 if (irq > GSC_IRQ_MAX)
153 return NO_IRQ;
154
155 irq_set_chip_and_handler(irq, type, handle_simple_irq);
156 irq_set_chip_data(irq, data);
157
158 return irq++;
159}
160
161void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
162{
163 int irq = asic->global_irq[local_irq];
164
165 if (irq <= 0) {
166 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
167 if (irq == NO_IRQ)
168 return;
169
170 asic->global_irq[local_irq] = irq;
171 }
172 *irqp = irq;
173}
174
175struct gsc_fixup_struct {
176 void (*choose_irq)(struct parisc_device *, void *);
177 void *ctrl;
178};
179
180static int gsc_fixup_irqs_callback(struct device *dev, void *data)
181{
182 struct parisc_device *padev = to_parisc_device(dev);
183 struct gsc_fixup_struct *gf = data;
184
185 /* work-around for 715/64 and others which have parent
186 at path [5] and children at path [5/0/x] */
187 if (padev->id.hw_type == HPHW_FAULTY)
188 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
189 gf->choose_irq(padev, gf->ctrl);
190
191 return 0;
192}
193
194void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
195 void (*choose_irq)(struct parisc_device *, void *))
196{
197 struct gsc_fixup_struct data = {
198 .choose_irq = choose_irq,
199 .ctrl = ctrl,
200 };
201
202 device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
203}
204
205int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
206{
207 struct resource *res;
208 int i;
209
210 gsc_asic->gsc = parent;
211
212 /* Initialise local irq -> global irq mapping */
213 for (i = 0; i < 32; i++) {
214 gsc_asic->global_irq[i] = NO_IRQ;
215 }
216
217 /* allocate resource region */
218 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
219 if (res) {
220 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
221 }
222
223#if 0
224 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
225 parent->irq, gsc_asic->eim);
226 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
227 printk(" IMR is non-zero! (0x%x)",
228 gsc_readl(gsc_asic->hpa + OFFSET_IMR));
229 printk("\n");
230#endif
231
232 return 0;
233}
234
235extern struct parisc_driver lasi_driver;
236extern struct parisc_driver asp_driver;
237extern struct parisc_driver wax_driver;
238
239void __init gsc_init(void)
240{
241#ifdef CONFIG_GSC_LASI
242 register_parisc_driver(&lasi_driver);
243 register_parisc_driver(&asp_driver);
244#endif
245#ifdef CONFIG_GSC_WAX
246 register_parisc_driver(&wax_driver);
247#endif
248}
249

Warning: That file was not part of the compilation database. It may have many parsing errors.