gsc.rar_gsc

/* * 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/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]; generic_handle_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_mask_irq(struct irq_data *d) { struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d); int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32); u32 imr; DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->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_unmask_irq(struct irq_data *d) { struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d); int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32); u32 imr; DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->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 struct irq_chip gsc_asic_interrupt_type = { .name = "GSC-ASIC", .irq_unmask = gsc_asic_unmask_irq, .irq_mask = gsc_asic_mask_irq, }; int gsc_assign_irq(struct irq_chip *type, void *data) { static int irq = GSC_IRQ_BASE; if (irq > GSC_IRQ_MAX) return NO_IRQ; irq_set_chip_and_handler(irq, type, handle_simple_irq); irq_set_chip_data(irq, 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; } struct gsc_fixup_struct { void (*choose_irq)(struct parisc_device *, void *); void *ctrl; }; static int gsc_fixup_irqs_callback(struct device *dev, void *data) { struct parisc_device *padev = to_parisc_device(dev); struct gsc_fixup_struct *gf = data; /* 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) gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq); gf->choose_irq(padev, gf->ctrl); return 0; } void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, void (*choose_irq)(struct parisc_device *, void *)) { struct gsc_fixup_struct data = { .choose_irq = choose_irq, .ctrl = ctrl, }; device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback); } 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 }