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, 178 insertions, 0 deletions

diff --git a/arch/ppc/amiga/cia.c b/arch/ppc/amiga/cia.c
new file mode 100644
index 000000000000..ad961465b6cb
--- /dev/null
+++ b/arch/ppc/amiga/cia.c
@@ -0,0 +1,178 @@
+/*
+ *  arch/ppc/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/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+
+#include <asm/irq.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+struct ciabase {
+        volatile struct CIA *cia;
+        u_char icr_mask, icr_data;
+        u_short int_mask;
+        int handler_irq, cia_irq, server_irq;
+        char *name;
+} ciaa_base = {
+        &ciaa, 0, 0, IF_PORTS,
+        IRQ_AMIGA_AUTO_2, IRQ_AMIGA_CIAA,
+        IRQ_AMIGA_PORTS,
+        "CIAA handler"
+}, ciab_base = {
+        &ciab, 0, 0, IF_EXTER,
+        IRQ_AMIGA_AUTO_6, IRQ_AMIGA_CIAB,
+        IRQ_AMIGA_EXTER,
+        "CIAB handler"
+};
+
+#define CIA_SET_BASE_ADJUST_IRQ(base, irq)      \
+do {                                            \
+        if (irq >= IRQ_AMIGA_CIAB) {            \
+                base = &ciab_base;              \
+                irq -= IRQ_AMIGA_CIAB;          \
+        } else {                                \
+                base = &ciaa_base;              \
+                irq -= IRQ_AMIGA_CIAA;          \
+        }                                       \
+} while (0)
+
+/*
+ *  Cause or clear CIA interrupts, return old interrupt status.
+ */
+
+static unsigned char cia_set_irq_private(struct ciabase *base,
+                                         unsigned char mask)
+{
+        u_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;
+}
+
+unsigned char cia_set_irq(unsigned int irq, int set)
+{
+        struct ciabase *base;
+        unsigned char mask;
+
+        if (irq >= IRQ_AMIGA_CIAB)
+                mask = (1 << (irq - IRQ_AMIGA_CIAB));
+        else
+                mask = (1 << (irq - IRQ_AMIGA_CIAA));
+        mask |= (set) ? CIA_ICR_SETCLR : 0;
+
+        CIA_SET_BASE_ADJUST_IRQ(base, irq);
+
+        return cia_set_irq_private(base, mask);
+}
+
+unsigned char cia_get_irq_mask(unsigned int irq)
+{
+        struct ciabase *base;
+
+        CIA_SET_BASE_ADJUST_IRQ(base, irq);
+
+        return base->cia->icr;
+}
+
+/*
+ *  Enable or disable CIA interrupts, return old interrupt mask.
+ */
+
+static unsigned char cia_able_irq_private(struct ciabase *base,
+                                          unsigned char mask)
+{
+        u_char old;
+
+        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;
+
+        if (base->icr_data & base->icr_mask)
+                custom.intreq = IF_SETCLR | base->int_mask;
+        return old;
+}
+
+unsigned char cia_able_irq(unsigned int irq, int enable)
+{
+        struct ciabase *base;
+        unsigned char mask;
+
+        if (irq >= IRQ_AMIGA_CIAB)
+                mask = (1 << (irq - IRQ_AMIGA_CIAB));
+        else
+                mask = (1 << (irq - IRQ_AMIGA_CIAA));
+        mask |= (enable) ? CIA_ICR_SETCLR : 0;
+
+        CIA_SET_BASE_ADJUST_IRQ(base, irq);
+
+        return cia_able_irq_private(base, mask);
+}
+
+static void cia_handler(int irq, void *dev_id, struct pt_regs *fp)
+{
+        struct ciabase *base = (struct ciabase *)dev_id;
+        irq_desc_t *desc;
+        struct irqaction *action;
+        int i;
+        unsigned char ints;
+
+        irq = base->cia_irq;
+        desc = irq_desc + irq;
+        ints = cia_set_irq_private(base, CIA_ICR_ALL);
+        custom.intreq = base->int_mask;
+        for (i = 0; i < CIA_IRQS; i++, irq++) {
+                if (ints & 1) {
+                        kstat_cpu(0).irqs[irq]++;
+                        action = desc->action;
+                        action->handler(irq, action->dev_id, fp);
+                }
+                ints >>= 1;
+                desc++;
+        }
+        amiga_do_irq_list(base->server_irq, fp);
+}
+
+void __init cia_init_IRQ(struct ciabase *base)
+{
+        extern struct irqaction amiga_sys_irqaction[AUTO_IRQS];
+        struct irqaction *action;
+
+        /* clear any pending interrupt and turn off all interrupts */
+        cia_set_irq_private(base, CIA_ICR_ALL);
+        cia_able_irq_private(base, CIA_ICR_ALL);
+
+        /* install CIA handler */
+        action = &amiga_sys_irqaction[base->handler_irq-IRQ_AMIGA_AUTO];
+        action->handler = cia_handler;
+        action->dev_id = base;
+        action->name = base->name;
+        setup_irq(base->handler_irq, &amiga_sys_irqaction[base->handler_irq-IRQ_AMIGA_AUTO]);
+
+        custom.intena = IF_SETCLR | base->int_mask;
+}