212 lines
5.2 KiB
C
212 lines
5.2 KiB
C
/*
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* Interrupt management for most GSC and related devices.
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*
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* (c) Copyright 1999 Alex deVries for The Puffin Group
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* (c) Copyright 1999 Grant Grundler for Hewlett-Packard
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* (c) Copyright 1999 Matthew Wilcox
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* (c) Copyright 2000 Helge Deller
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* (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/bitops.h>
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include "gsc.h"
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/* This sets the vmerge boundary and size, it's here because it has to
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* be available on all platforms (zero means no-virtual merging) */
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unsigned long parisc_vmerge_boundary = 0;
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unsigned long parisc_vmerge_max_size = 0;
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#undef DEBUG
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#ifdef DEBUG
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#define DEBPRINTK printk
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#else
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#define DEBPRINTK(x,...)
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#endif
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int gsc_alloc_irq(struct gsc_irq *i)
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{
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int irq = txn_alloc_irq();
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if (irq < 0) {
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printk("cannot get irq\n");
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return irq;
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}
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i->txn_addr = txn_alloc_addr(irq);
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i->txn_data = txn_alloc_data(irq, GSC_EIM_WIDTH);
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i->irq = irq;
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return irq;
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}
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int gsc_claim_irq(struct gsc_irq *i, int irq)
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{
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int c = irq;
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irq += IRQ_FROM_REGION(CPU_IRQ_REGION); /* virtualize the IRQ first */
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irq = txn_claim_irq(irq);
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if (irq < 0) {
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printk("cannot claim irq %d\n", c);
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return irq;
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}
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i->txn_addr = txn_alloc_addr(irq);
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i->txn_data = txn_alloc_data(irq, GSC_EIM_WIDTH);
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i->irq = irq;
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return irq;
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}
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EXPORT_SYMBOL(gsc_alloc_irq);
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EXPORT_SYMBOL(gsc_claim_irq);
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/* IRQ bits must be numbered from Most Significant Bit */
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#define GSC_FIX_IRQ(x) (31-(x))
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#define GSC_MASK_IRQ(x) (1<<(GSC_FIX_IRQ(x)))
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/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
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irqreturn_t busdev_barked(int busdev_irq, void *dev, struct pt_regs *regs)
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{
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unsigned long irq;
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struct busdevice *busdev = (struct busdevice *) dev;
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/*
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Don't need to protect OFFSET_IRR with spinlock since this is
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the only place it's touched.
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Protect busdev_region by disabling this region's interrupts,
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modifying the region, and then re-enabling the region.
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*/
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irq = gsc_readl(busdev->hpa+OFFSET_IRR);
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if (irq == 0) {
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printk(KERN_ERR "%s: barking without apparent reason.\n", busdev->name);
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} else {
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DEBPRINTK ("%s (0x%x) barked, mask=0x%x, irq=%d\n",
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busdev->name, busdev->busdev_region->data.irqbase,
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irq, GSC_FIX_IRQ(ffs(irq))+1 );
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do_irq_mask(irq, busdev->busdev_region, regs);
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}
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return IRQ_HANDLED;
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}
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static void
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busdev_disable_irq(void *irq_dev, int irq)
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{
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/* Disable the IRQ line by clearing the bit in the IMR */
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u32 imr = gsc_readl(BUSDEV_DEV(irq_dev)->hpa+OFFSET_IMR);
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imr &= ~(GSC_MASK_IRQ(irq));
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DEBPRINTK( KERN_WARNING "%s(%p, %d) %s: IMR 0x%x\n",
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__FUNCTION__, irq_dev, irq, BUSDEV_DEV(irq_dev)->name, imr);
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gsc_writel(imr, BUSDEV_DEV(irq_dev)->hpa+OFFSET_IMR);
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}
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static void
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busdev_enable_irq(void *irq_dev, int irq)
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{
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/* Enable the IRQ line by setting the bit in the IMR */
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unsigned long addr = BUSDEV_DEV(irq_dev)->hpa + OFFSET_IMR;
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u32 imr = gsc_readl(addr);
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imr |= GSC_MASK_IRQ(irq);
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DEBPRINTK (KERN_WARNING "%s(%p, %d) %s: IMR 0x%x\n",
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__FUNCTION__, irq_dev, irq, BUSDEV_DEV(irq_dev)->name, imr);
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gsc_writel(imr, addr);
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// gsc_writel(~0L, addr);
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/* FIXME: read IPR to make sure the IRQ isn't already pending.
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** If so, we need to read IRR and manually call do_irq_mask().
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** This code should be shared with busdev_unmask_irq().
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*/
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}
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static void
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busdev_mask_irq(void *irq_dev, int irq)
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{
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/* FIXME: Clear the IMR bit in busdev for that IRQ */
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}
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static void
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busdev_unmask_irq(void *irq_dev, int irq)
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{
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/* FIXME: Read IPR. Set the IMR bit in busdev for that IRQ.
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call do_irq_mask() if IPR is non-zero
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*/
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}
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struct irq_region_ops busdev_irq_ops = {
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.disable_irq = busdev_disable_irq,
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.enable_irq = busdev_enable_irq,
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.mask_irq = busdev_mask_irq,
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.unmask_irq = busdev_unmask_irq
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};
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int gsc_common_irqsetup(struct parisc_device *parent, struct busdevice *busdev)
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{
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struct resource *res;
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busdev->gsc = parent;
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/* the IRQs we simulate */
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busdev->busdev_region = alloc_irq_region(32, &busdev_irq_ops,
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busdev->name, busdev);
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if (!busdev->busdev_region)
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return -ENOMEM;
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/* allocate resource region */
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res = request_mem_region(busdev->hpa, 0x100000, busdev->name);
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if (res) {
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res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
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}
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#if 0
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printk(KERN_WARNING "%s IRQ %d EIM 0x%x", busdev->name,
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busdev->parent_irq, busdev->eim);
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if (gsc_readl(busdev->hpa + OFFSET_IMR))
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printk(" IMR is non-zero! (0x%x)",
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gsc_readl(busdev->hpa + OFFSET_IMR));
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printk("\n");
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#endif
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return 0;
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}
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extern struct parisc_driver lasi_driver;
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extern struct parisc_driver asp_driver;
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extern struct parisc_driver wax_driver;
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void __init gsc_init(void)
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{
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#ifdef CONFIG_GSC_LASI
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register_parisc_driver(&lasi_driver);
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register_parisc_driver(&asp_driver);
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#endif
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#ifdef CONFIG_GSC_WAX
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register_parisc_driver(&wax_driver);
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#endif
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}
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