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/config.h>
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/ioport.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/types.h>
26 #include <asm/hardware.h>
34 #define DEBPRINTK printk
36 #define DEBPRINTK(x,...)
39 int gsc_alloc_irq(struct gsc_irq *i)
41 int irq = txn_alloc_irq(GSC_EIM_WIDTH);
43 printk("cannot get irq\n");
47 i->txn_addr = txn_alloc_addr(irq);
48 i->txn_data = txn_alloc_data(irq);
54 int gsc_claim_irq(struct gsc_irq *i, int irq)
58 irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
60 irq = txn_claim_irq(irq);
62 printk("cannot claim irq %d\n", c);
66 i->txn_addr = txn_alloc_addr(irq);
67 i->txn_data = txn_alloc_data(irq);
73 EXPORT_SYMBOL(gsc_alloc_irq);
74 EXPORT_SYMBOL(gsc_claim_irq);
76 /* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
77 irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev, struct pt_regs *regs)
80 struct gsc_asic *gsc_asic = dev;
82 irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
86 DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
89 int local_irq = __ffs(irr);
90 unsigned int irq = gsc_asic->global_irq[local_irq];
92 irr &= ~(1 << local_irq);
98 int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
102 for (local_irq = 0; local_irq < limit; local_irq++) {
103 if (global_irqs[local_irq] == irq)
110 static void gsc_asic_disable_irq(unsigned int irq)
112 struct gsc_asic *irq_dev = irq_desc[irq].handler_data;
113 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
116 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq,
119 /* Disable the IRQ line by clearing the bit in the IMR */
120 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
121 imr &= ~(1 << local_irq);
122 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
125 static void gsc_asic_enable_irq(unsigned int irq)
127 struct gsc_asic *irq_dev = irq_desc[irq].handler_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", __FUNCTION__, 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 hw_interrupt_type gsc_asic_interrupt_type = {
151 .typename = "GSC-ASIC",
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 hw_interrupt_type *type, void *data)
162 static int irq = GSC_IRQ_BASE;
164 if (irq > GSC_IRQ_MAX)
167 irq_desc[irq].handler = type;
168 irq_desc[irq].handler_data = data;
172 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
174 int irq = asic->global_irq[local_irq];
177 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
181 asic->global_irq[local_irq] = irq;
186 static struct device *next_device(struct klist_iter *i)
188 struct klist_node * n = klist_next(i);
189 return n ? container_of(n, struct device, knode_parent) : NULL;
192 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
193 void (*choose_irq)(struct parisc_device *, void *))
198 klist_iter_init(&parent->dev.klist_children, &i);
199 while ((dev = next_device(&i))) {
200 struct parisc_device *padev = to_parisc_device(dev);
202 /* work-around for 715/64 and others which have parent
203 at path [5] and children at path [5/0/x] */
204 if (padev->id.hw_type == HPHW_FAULTY)
205 return gsc_fixup_irqs(padev, ctrl, choose_irq);
206 choose_irq(padev, ctrl);
211 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
213 struct resource *res;
216 gsc_asic->gsc = parent;
218 /* Initialise local irq -> global irq mapping */
219 for (i = 0; i < 32; i++) {
220 gsc_asic->global_irq[i] = NO_IRQ;
223 /* allocate resource region */
224 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
226 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
230 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
231 parent->irq, gsc_asic->eim);
232 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
233 printk(" IMR is non-zero! (0x%x)",
234 gsc_readl(gsc_asic->hpa + OFFSET_IMR));
241 extern struct parisc_driver lasi_driver;
242 extern struct parisc_driver asp_driver;
243 extern struct parisc_driver wax_driver;
245 void __init gsc_init(void)
247 #ifdef CONFIG_GSC_LASI
248 register_parisc_driver(&lasi_driver);
249 register_parisc_driver(&asp_driver);
251 #ifdef CONFIG_GSC_WAX
252 register_parisc_driver(&wax_driver);