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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/parisc/gsc.c
downloadlinux-linaro-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/parisc/gsc.c')
-rw-r--r--drivers/parisc/gsc.c245
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
+}