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-rw-r--r--arch/m68k/mac/baboon.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/arch/m68k/mac/baboon.c b/arch/m68k/mac/baboon.c
new file mode 100644
index 0000000..b19b7dd
--- /dev/null
+++ b/arch/m68k/mac/baboon.c
@@ -0,0 +1,126 @@
+/*
+ * Baboon Custom IC Management
+ *
+ * The Baboon custom IC controls the IDE, PCMCIA and media bay on the
+ * PowerBook 190. It multiplexes multiple interrupt sources onto the
+ * Nubus slot $C interrupt.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ide.h>
+
+#include <asm/traps.h>
+#include <asm/bootinfo.h>
+#include <asm/macintosh.h>
+#include <asm/macints.h>
+#include <asm/mac_baboon.h>
+
+/* #define DEBUG_BABOON */
+/* #define DEBUG_IRQS */
+
+int baboon_present,baboon_active;
+volatile struct baboon *baboon;
+
+irqreturn_t baboon_irq(int, void *, struct pt_regs *);
+
+#if 0
+extern int macide_ack_intr(struct ata_channel *);
+#endif
+
+/*
+ * Baboon initialization.
+ */
+
+void __init baboon_init(void)
+{
+ if (macintosh_config->ident != MAC_MODEL_PB190) {
+ baboon = NULL;
+ baboon_present = 0;
+ return;
+ }
+
+ baboon = (struct baboon *) BABOON_BASE;
+ baboon_present = 1;
+ baboon_active = 0;
+
+ printk("Baboon detected at %p\n", baboon);
+}
+
+/*
+ * Register the Baboon interrupt dispatcher on nubus slot $C.
+ */
+
+void __init baboon_register_interrupts(void)
+{
+ request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
+ "baboon", (void *) baboon);
+}
+
+/*
+ * Baboon interrupt handler. This works a lot like a VIA.
+ */
+
+irqreturn_t baboon_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int irq_bit,i;
+ unsigned char events;
+
+#ifdef DEBUG_IRQS
+ printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X active %02X\n",
+ (uint) baboon->mb_control, (uint) baboon->mb_ifr,
+ (uint) baboon->mb_status, baboon_active);
+#endif
+
+ if (!(events = baboon->mb_ifr & 0x07))
+ return IRQ_NONE;
+
+ for (i = 0, irq_bit = 1 ; i < 3 ; i++, irq_bit <<= 1) {
+ if (events & irq_bit/* & baboon_active*/) {
+ baboon_active &= ~irq_bit;
+ mac_do_irq_list(IRQ_BABOON_0 + i, regs);
+ baboon_active |= irq_bit;
+ baboon->mb_ifr &= ~irq_bit;
+ }
+ }
+#if 0
+ if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
+ /* for now we need to smash all interrupts */
+ baboon->mb_ifr &= ~events;
+#endif
+ return IRQ_HANDLED;
+}
+
+void baboon_irq_enable(int irq) {
+ int irq_idx = IRQ_IDX(irq);
+
+#ifdef DEBUG_IRQUSE
+ printk("baboon_irq_enable(%d)\n", irq);
+#endif
+ baboon_active |= (1 << irq_idx);
+}
+
+void baboon_irq_disable(int irq) {
+ int irq_idx = IRQ_IDX(irq);
+
+#ifdef DEBUG_IRQUSE
+ printk("baboon_irq_disable(%d)\n", irq);
+#endif
+ baboon_active &= ~(1 << irq_idx);
+}
+
+void baboon_irq_clear(int irq) {
+ int irq_idx = IRQ_IDX(irq);
+
+ baboon->mb_ifr &= ~(1 << irq_idx);
+}
+
+int baboon_irq_pending(int irq)
+{
+ int irq_idx = IRQ_IDX(irq);
+
+ return baboon->mb_ifr & (1 << irq_idx);
+}
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