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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
244 lines
5.4 KiB
C
244 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <linux/bitops.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/types.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include "gsc.h"
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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(GSC_EIM_WIDTH);
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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);
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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 += CPU_IRQ_BASE; /* 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);
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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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/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
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irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
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{
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unsigned long irr;
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struct gsc_asic *gsc_asic = dev;
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irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
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if (irr == 0)
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return IRQ_NONE;
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DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
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do {
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int local_irq = __ffs(irr);
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unsigned int irq = gsc_asic->global_irq[local_irq];
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generic_handle_irq(irq);
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irr &= ~(1 << local_irq);
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} while (irr);
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return IRQ_HANDLED;
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}
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int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
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{
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int local_irq;
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for (local_irq = 0; local_irq < limit; local_irq++) {
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if (global_irqs[local_irq] == irq)
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return local_irq;
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}
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return NO_IRQ;
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}
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static void gsc_asic_mask_irq(struct irq_data *d)
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{
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struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
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int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
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u32 imr;
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DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
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irq_dev->name, imr);
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/* Disable the IRQ line by clearing the bit in the IMR */
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imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
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imr &= ~(1 << local_irq);
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gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
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}
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static void gsc_asic_unmask_irq(struct irq_data *d)
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{
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struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
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int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
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u32 imr;
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DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
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irq_dev->name, imr);
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/* Enable the IRQ line by setting the bit in the IMR */
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imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
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imr |= 1 << local_irq;
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gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
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/*
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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().
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*/
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}
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static struct irq_chip gsc_asic_interrupt_type = {
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.name = "GSC-ASIC",
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.irq_unmask = gsc_asic_unmask_irq,
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.irq_mask = gsc_asic_mask_irq,
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};
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int gsc_assign_irq(struct irq_chip *type, void *data)
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{
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static int irq = GSC_IRQ_BASE;
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if (irq > GSC_IRQ_MAX)
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return NO_IRQ;
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irq_set_chip_and_handler(irq, type, handle_simple_irq);
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irq_set_chip_data(irq, data);
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return irq++;
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}
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void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
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{
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int irq = asic->global_irq[local_irq];
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if (irq <= 0) {
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irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
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if (irq == NO_IRQ)
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return;
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asic->global_irq[local_irq] = irq;
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}
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*irqp = irq;
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}
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struct gsc_fixup_struct {
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void (*choose_irq)(struct parisc_device *, void *);
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void *ctrl;
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};
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static int gsc_fixup_irqs_callback(struct device *dev, void *data)
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{
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struct parisc_device *padev = to_parisc_device(dev);
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struct gsc_fixup_struct *gf = data;
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/* work-around for 715/64 and others which have parent
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at path [5] and children at path [5/0/x] */
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if (padev->id.hw_type == HPHW_FAULTY)
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gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
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gf->choose_irq(padev, gf->ctrl);
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return 0;
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}
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void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
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void (*choose_irq)(struct parisc_device *, void *))
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{
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struct gsc_fixup_struct data = {
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.choose_irq = choose_irq,
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.ctrl = ctrl,
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};
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device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
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}
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int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
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{
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struct resource *res;
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int i;
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gsc_asic->gsc = parent;
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/* Initialise local irq -> global irq mapping */
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for (i = 0; i < 32; i++) {
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gsc_asic->global_irq[i] = NO_IRQ;
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}
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/* allocate resource region */
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res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->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", gsc_asic->name,
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parent->irq, gsc_asic->eim);
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if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
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printk(" IMR is non-zero! (0x%x)",
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gsc_readl(gsc_asic->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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