1 files changed, 245 insertions, 0 deletions

diff --git a/drivers/parisc/gsc.c b/drivers/parisc/gsc.c
new file mode 100644
index 000000000000..af5e02526a18
--- /dev/null
+++ b/drivers/parisc/gsc.c
@@ -0,0 +1,245 @@
+/*
+ * 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/config.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, struct pt_regs *regs)
+{
+        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, regs);
+                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 gsc_asic *irq_dev = irq_desc[irq].handler_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", __FUNCTION__, 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 gsc_asic *irq_dev = irq_desc[irq].handler_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", __FUNCTION__, 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;
+
+        if (irq > GSC_IRQ_MAX)
+                return NO_IRQ;
+
+        irq_desc[irq].handler = type;
+        irq_desc[irq].handler_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;
+}
+
+void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
+                        void (*choose_irq)(struct parisc_device *, void *))
+{
+        struct device *dev;
+
+        list_for_each_entry(dev, &parent->dev.children, node) {
+                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);
+        }
+}
+
+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
+}