2 * Interrupt management for most GSC and related devices.
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
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.
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>
24 #include <asm/hardware.h>
32 #define DEBPRINTK printk
34 #define DEBPRINTK(x,...)
37 int gsc_alloc_irq(struct gsc_irq *i)
39 int irq = txn_alloc_irq(GSC_EIM_WIDTH);
41 printk("cannot get irq\n");
45 i->txn_addr = txn_alloc_addr(irq);
46 i->txn_data = txn_alloc_data(irq);
52 int gsc_claim_irq(struct gsc_irq *i, int irq)
56 irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
58 irq = txn_claim_irq(irq);
60 printk("cannot claim irq %d\n", c);
64 i->txn_addr = txn_alloc_addr(irq);
65 i->txn_data = txn_alloc_data(irq);
71 EXPORT_SYMBOL(gsc_alloc_irq);
72 EXPORT_SYMBOL(gsc_claim_irq);
74 /* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
75 irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
78 struct gsc_asic *gsc_asic = dev;
80 irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
84 DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
87 int local_irq = __ffs(irr);
88 unsigned int irq = gsc_asic->global_irq[local_irq];
90 irr &= ~(1 << local_irq);
96 int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
100 for (local_irq = 0; local_irq < limit; local_irq++) {
101 if (global_irqs[local_irq] == irq)
108 static void gsc_asic_disable_irq(unsigned int irq)
110 struct irq_desc *desc = irq_to_desc(irq);
111 struct gsc_asic *irq_dev = desc->chip_data;
112 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
115 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
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);
124 static void gsc_asic_enable_irq(unsigned int irq)
126 struct irq_desc *desc = irq_to_desc(irq);
127 struct gsc_asic *irq_dev = desc->chip_data;
128 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
131 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
134 /* Enable the IRQ line by setting the bit in the IMR */
135 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
136 imr |= 1 << local_irq;
137 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
139 * FIXME: read IPR to make sure the IRQ isn't already pending.
140 * If so, we need to read IRR and manually call do_irq().
144 static unsigned int gsc_asic_startup_irq(unsigned int irq)
146 gsc_asic_enable_irq(irq);
150 static struct irq_chip gsc_asic_interrupt_type = {
152 .startup = gsc_asic_startup_irq,
153 .shutdown = gsc_asic_disable_irq,
154 .enable = gsc_asic_enable_irq,
155 .disable = gsc_asic_disable_irq,
160 int gsc_assign_irq(struct irq_chip *type, void *data)
162 static int irq = GSC_IRQ_BASE;
163 struct irq_desc *desc;
165 if (irq > GSC_IRQ_MAX)
168 desc = irq_to_desc(irq);
170 desc->chip_data = data;
174 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
176 int irq = asic->global_irq[local_irq];
179 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
183 asic->global_irq[local_irq] = irq;
188 struct gsc_fixup_struct {
189 void (*choose_irq)(struct parisc_device *, void *);
193 static int gsc_fixup_irqs_callback(struct device *dev, void *data)
195 struct parisc_device *padev = to_parisc_device(dev);
196 struct gsc_fixup_struct *gf = data;
198 /* work-around for 715/64 and others which have parent
199 at path [5] and children at path [5/0/x] */
200 if (padev->id.hw_type == HPHW_FAULTY)
201 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
202 gf->choose_irq(padev, gf->ctrl);
207 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
208 void (*choose_irq)(struct parisc_device *, void *))
210 struct gsc_fixup_struct data = {
211 .choose_irq = choose_irq,
215 device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
218 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
220 struct resource *res;
223 gsc_asic->gsc = parent;
225 /* Initialise local irq -> global irq mapping */
226 for (i = 0; i < 32; i++) {
227 gsc_asic->global_irq[i] = NO_IRQ;
230 /* allocate resource region */
231 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
233 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
237 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
238 parent->irq, gsc_asic->eim);
239 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
240 printk(" IMR is non-zero! (0x%x)",
241 gsc_readl(gsc_asic->hpa + OFFSET_IMR));
248 extern struct parisc_driver lasi_driver;
249 extern struct parisc_driver asp_driver;
250 extern struct parisc_driver wax_driver;
252 void __init gsc_init(void)
254 #ifdef CONFIG_GSC_LASI
255 register_parisc_driver(&lasi_driver);
256 register_parisc_driver(&asp_driver);
258 #ifdef CONFIG_GSC_WAX
259 register_parisc_driver(&wax_driver);