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!

1 files changed, 180 insertions, 0 deletions

diff --git a/arch/m68k/amiga/cia.c b/arch/m68k/amiga/cia.c
new file mode 100644
index 0000000..7d55682
--- /dev/null
+++ b/arch/m68k/amiga/cia.c
@@ -0,0 +1,180 @@
+/*
+ *  linux/arch/m68k/amiga/cia.c - CIA support
+ *
+ *  Copyright (C) 1996 Roman Zippel
+ *
+ *  The concept of some functions bases on the original Amiga OS function
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+
+#include <asm/irq.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+struct ciabase {
+	volatile struct CIA *cia;
+	unsigned char icr_mask, icr_data;
+	unsigned short int_mask;
+	int handler_irq, cia_irq, server_irq;
+	char *name;
+	irq_handler_t irq_list[CIA_IRQS];
+} ciaa_base = {
+	.cia		= &ciaa,
+	.int_mask	= IF_PORTS,
+	.handler_irq	= IRQ_AMIGA_AUTO_2,
+	.cia_irq	= IRQ_AMIGA_CIAA,
+	.server_irq	= IRQ_AMIGA_PORTS,
+	.name		= "CIAA handler"
+}, ciab_base = {
+	.cia		= &ciab,
+	.int_mask	= IF_EXTER,
+	.handler_irq	= IRQ_AMIGA_AUTO_6,
+	.cia_irq	= IRQ_AMIGA_CIAB,
+	.server_irq	= IRQ_AMIGA_EXTER,
+	.name		= "CIAB handler"
+};
+
+/*
+ *  Cause or clear CIA interrupts, return old interrupt status.
+ */
+
+unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
+{
+	unsigned char old;
+
+	old = (base->icr_data |= base->cia->icr);
+	if (mask & CIA_ICR_SETCLR)
+		base->icr_data |= mask;
+	else
+		base->icr_data &= ~mask;
+	if (base->icr_data & base->icr_mask)
+		custom.intreq = IF_SETCLR | base->int_mask;
+	return old & base->icr_mask;
+}
+
+/*
+ *  Enable or disable CIA interrupts, return old interrupt mask,
+ *  interrupts will only be enabled if a handler exists
+ */
+
+unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
+{
+	unsigned char old, tmp;
+	int i;
+
+	old = base->icr_mask;
+	base->icr_data |= base->cia->icr;
+	base->cia->icr = mask;
+	if (mask & CIA_ICR_SETCLR)
+		base->icr_mask |= mask;
+	else
+		base->icr_mask &= ~mask;
+	base->icr_mask &= CIA_ICR_ALL;
+	for (i = 0, tmp = 1; i < CIA_IRQS; i++, tmp <<= 1) {
+		if ((tmp & base->icr_mask) && !base->irq_list[i].handler) {
+			base->icr_mask &= ~tmp;
+			base->cia->icr = tmp;
+		}
+	}
+	if (base->icr_data & base->icr_mask)
+		custom.intreq = IF_SETCLR | base->int_mask;
+	return old;
+}
+
+int cia_request_irq(struct ciabase *base, unsigned int irq,
+                    irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                    unsigned long flags, const char *devname, void *dev_id)
+{
+	unsigned char mask;
+
+	base->irq_list[irq].handler = handler;
+	base->irq_list[irq].flags   = flags;
+	base->irq_list[irq].dev_id  = dev_id;
+	base->irq_list[irq].devname = devname;
+
+	/* enable the interrupt */
+	mask = 1 << irq;
+	cia_set_irq(base, mask);
+	cia_able_irq(base, CIA_ICR_SETCLR | mask);
+	return 0;
+}
+
+void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id)
+{
+	if (base->irq_list[irq].dev_id != dev_id)
+		printk("%s: removing probably wrong IRQ %i from %s\n",
+		       __FUNCTION__, base->cia_irq + irq,
+		       base->irq_list[irq].devname);
+
+	base->irq_list[irq].handler = NULL;
+	base->irq_list[irq].flags   = 0;
+
+	cia_able_irq(base, 1 << irq);
+}
+
+static irqreturn_t cia_handler(int irq, void *dev_id, struct pt_regs *fp)
+{
+	struct ciabase *base = (struct ciabase *)dev_id;
+	int mach_irq, i;
+	unsigned char ints;
+
+	mach_irq = base->cia_irq;
+	irq = SYS_IRQS + mach_irq;
+	ints = cia_set_irq(base, CIA_ICR_ALL);
+	custom.intreq = base->int_mask;
+	for (i = 0; i < CIA_IRQS; i++, irq++, mach_irq++) {
+		if (ints & 1) {
+			kstat_cpu(0).irqs[irq]++;
+			base->irq_list[i].handler(mach_irq, base->irq_list[i].dev_id, fp);
+		}
+		ints >>= 1;
+	}
+	amiga_do_irq_list(base->server_irq, fp);
+	return IRQ_HANDLED;
+}
+
+void __init cia_init_IRQ(struct ciabase *base)
+{
+	int i;
+
+	/* init isr handlers */
+	for (i = 0; i < CIA_IRQS; i++) {
+		base->irq_list[i].handler = NULL;
+		base->irq_list[i].flags   = 0;
+	}
+
+	/* clear any pending interrupt and turn off all interrupts */
+	cia_set_irq(base, CIA_ICR_ALL);
+	cia_able_irq(base, CIA_ICR_ALL);
+
+	/* install CIA handler */
+	request_irq(base->handler_irq, cia_handler, 0, base->name, base);
+
+	custom.intena = IF_SETCLR | base->int_mask;
+}
+
+int cia_get_irq_list(struct ciabase *base, struct seq_file *p)
+{
+	int i, j;
+
+	j = base->cia_irq;
+	for (i = 0; i < CIA_IRQS; i++) {
+		seq_printf(p, "cia  %2d: %10d ", j + i,
+			       kstat_cpu(0).irqs[SYS_IRQS + j + i]);
+		seq_puts(p, "  ");
+		seq_printf(p, "%s\n", base->irq_list[i].devname);
+	}
+	return 0;
+}