/*
* Interrupt management for most GSC and related devices.
*
* (c) Copyright 1999 Alex deVries for The Puffin Group
* (c) Copyright 1999 Grant Grundler for Hewlett-Packard
* (c) Copyright 1999 Matthew Wilcox
* (c) Copyright 2000 Helge Deller
* (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include "gsc.h"
#undef DEBUG
#ifdef DEBUG
#define DEBPRINTK printk
#else
#define DEBPRINTK(x,...)
#endif
int gsc_alloc_irq(struct gsc_irq *i)
{
int irq = txn_alloc_irq(GSC_EIM_WIDTH);
if (irq < 0) {
printk("cannot get irq\n");
return irq;
}
i->txn_addr = txn_alloc_addr(irq);
i->txn_data = txn_alloc_data(irq);
i->irq = irq;
return irq;
}
int gsc_claim_irq(struct gsc_irq *i, int irq)
{
int c = irq;
irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
irq = txn_claim_irq(irq);
if (irq < 0) {
printk("cannot claim irq %d\n", c);
return irq;
}
i->txn_addr = txn_alloc_addr(irq);
i->txn_data = txn_alloc_data(irq);
i->irq = irq;
return irq;
}
EXPORT_SYMBOL(gsc_alloc_irq);
EXPORT_SYMBOL(gsc_claim_irq);
/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
{
unsigned long irr;
struct gsc_asic *gsc_asic = dev;
irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
if (irr == 0)
return IRQ_NONE;
DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
do {
int local_irq = __ffs(irr);
unsigned int irq = gsc_asic->global_irq[local_irq];
__do_IRQ(irq);
irr &= ~(1 << local_irq);
} while (irr);
return IRQ_HANDLED;
}
int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
{
int local_irq;
for (local_irq = 0; local_irq < limit; local_irq++) {
if (global_irqs[local_irq] == irq)
return local_irq;
}
return NO_IRQ;
}
static void gsc_asic_disable_irq(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
struct gsc_asic *irq_dev = desc->chip_data;
int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
u32 imr;
DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
irq_dev->name, imr);
/* Disable the IRQ line by clearing the bit in the IMR */
imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
imr &= ~(1 << local_irq);
gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
}
static void gsc_asic_enable_irq(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
struct gsc_asic *irq_dev = desc->chip_data;
int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
u32 imr;
DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
irq_dev->name, imr);
/* Enable the IRQ line by setting the bit in the IMR */
imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
imr |= 1 << local_irq;
gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
/*
* FIXME: read IPR to make sure the IRQ isn't already pending.
* If so, we need to read IRR and manually call do_irq().
*/
}
static unsigned int gsc_asic_startup_irq(unsigned int irq)
{
gsc_asic_enable_irq(irq);
return 0;
}
static struct hw_interrupt_type gsc_asic_interrupt_type = {
.typename = "GSC-ASIC",
.startup = gsc_asic_startup_irq,
.shutdown = gsc_asic_disable_irq,
.enable = gsc_asic_enable_irq,
.disable = gsc_asic_disable_irq,
.ack = no_ack_irq,
.end = no_end_irq,
};
int gsc_assign_irq(struct hw_interrupt_type *type, void *data)
{
static int irq = GSC_IRQ_BASE;
struct irq_desc *desc;
if (irq > GSC_IRQ_MAX)
return NO_IRQ;
desc = irq_to_desc(irq);
desc->chip = type;
desc->chip_data = data;
return irq++;
}
void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
{
int irq = asic->global_irq[local_irq];
if (irq <= 0) {
irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
if (irq == NO_IRQ)
return;
asic->global_irq[local_irq] = irq;
}
*irqp = irq;
}
static struct device *next_device(struct klist_iter *i)
{
struct klist_node * n = klist_next(i);
return n ? container_of(n, struct device, knode_parent) : NULL;
}
void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
void (*choose_irq)(struct parisc_device *, void *))
{
struct device *dev;
struct klist_iter i;
klist_iter_init(&parent->dev.klist_children, &i);
while ((dev = next_device(&i))) {
struct parisc_device *padev = to_parisc_device(dev);
/* work-around for 715/64 and others which have parent
at path [5] and children at path [5/0/x] */
if (padev->id.hw_type == HPHW_FAULTY)
return gsc_fixup_irqs(padev, ctrl, choose_irq);
choose_irq(padev, ctrl);
}
klist_iter_exit(&i);
}
int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
{
struct resource *res;
int i;
gsc_asic->gsc = parent;
/* Initialise local irq -> global irq mapping */
for (i = 0; i < 32; i++) {
gsc_asic->global_irq[i] = NO_IRQ;
}
/* allocate resource region */
res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
if (res) {
res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
}
#if 0
printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
parent->irq, gsc_asic->eim);
if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
printk(" IMR is non-zero! (0x%x)",
gsc_readl(gsc_asic->hpa + OFFSET_IMR));
printk("\n");
#endif
return 0;
}
extern struct parisc_driver lasi_driver;
extern struct parisc_driver asp_driver;
extern struct parisc_driver wax_driver;
void __init gsc_init(void)
{
#ifdef CONFIG_GSC_LASI
register_parisc_driver(&lasi_driver);
register_parisc_driver(&asp_driver);
#endif
#ifdef CONFIG_GSC_WAX
register_parisc_driver(&wax_driver);
#endif
}
