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];
89 generic_handle_irq(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_mask_irq(struct irq_data *d)
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);
114 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
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);
123 static void gsc_asic_unmask_irq(struct irq_data *d)
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);
129 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
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);
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().
143 static int gsc_set_affinity_irq(struct irq_data *d, const struct cpumask *dest,
146 struct gsc_asic *gsc_dev = irq_data_get_irq_chip_data(d);
147 struct cpumask tmask;
150 if (!cpumask_and(&tmask, dest, cpu_online_mask))
153 cpu_irq = cpu_check_affinity(d, &tmask);
157 gsc_dev->gsc_irq.txn_addr = txn_affinity_addr(d->irq, cpu_irq);
158 gsc_dev->eim = ((u32) gsc_dev->gsc_irq.txn_addr) | gsc_dev->gsc_irq.txn_data;
160 /* switch IRQ's for devices below LASI/WAX to other CPU */
161 gsc_writel(gsc_dev->eim, gsc_dev->hpa + OFFSET_IAR);
163 irq_data_update_effective_affinity(d, &tmask);
165 return IRQ_SET_MASK_OK;
170 static struct irq_chip gsc_asic_interrupt_type = {
172 .irq_unmask = gsc_asic_unmask_irq,
173 .irq_mask = gsc_asic_mask_irq,
175 .irq_set_affinity = gsc_set_affinity_irq,
179 int gsc_assign_irq(struct irq_chip *type, void *data)
181 static int irq = GSC_IRQ_BASE;
183 if (irq > GSC_IRQ_MAX)
186 irq_set_chip_and_handler(irq, type, handle_simple_irq);
187 irq_set_chip_data(irq, data);
192 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
194 int irq = asic->global_irq[local_irq];
197 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
201 asic->global_irq[local_irq] = irq;
206 struct gsc_fixup_struct {
207 void (*choose_irq)(struct parisc_device *, void *);
211 static int gsc_fixup_irqs_callback(struct device *dev, void *data)
213 struct parisc_device *padev = to_parisc_device(dev);
214 struct gsc_fixup_struct *gf = data;
216 /* work-around for 715/64 and others which have parent
217 at path [5] and children at path [5/0/x] */
218 if (padev->id.hw_type == HPHW_FAULTY)
219 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
220 gf->choose_irq(padev, gf->ctrl);
225 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
226 void (*choose_irq)(struct parisc_device *, void *))
228 struct gsc_fixup_struct data = {
229 .choose_irq = choose_irq,
233 device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
236 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
238 struct resource *res;
241 gsc_asic->gsc = parent;
243 /* Initialise local irq -> global irq mapping */
244 for (i = 0; i < 32; i++) {
245 gsc_asic->global_irq[i] = NO_IRQ;
248 /* allocate resource region */
249 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
251 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
255 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
256 parent->irq, gsc_asic->eim);
257 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
258 printk(" IMR is non-zero! (0x%x)",
259 gsc_readl(gsc_asic->hpa + OFFSET_IMR));
266 extern struct parisc_driver lasi_driver;
267 extern struct parisc_driver asp_driver;
268 extern struct parisc_driver wax_driver;
270 void __init gsc_init(void)
272 #ifdef CONFIG_GSC_LASI
273 register_parisc_driver(&lasi_driver);
274 register_parisc_driver(&asp_driver);
276 #ifdef CONFIG_GSC_WAX
277 register_parisc_driver(&wax_driver);