Initial import

1 files changed, 114 insertions, 0 deletions

diff --git a/arch/m68k/mac/baboon.c b/arch/m68k/mac/baboon.c
new file mode 100644
index 000000000..3fe0e43d4
--- /dev/null
+++ b/arch/m68k/mac/baboon.c
@@ -0,0 +1,114 @@
+/*
+ * 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/irq.h>
+
+#include <asm/macintosh.h>
+#include <asm/macints.h>
+#include <asm/mac_baboon.h>
+
+/* #define DEBUG_IRQS */
+
+int baboon_present;
+static volatile struct baboon *baboon;
+
+#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;
+
+	printk("Baboon detected at %p\n", baboon);
+}
+
+/*
+ * Baboon interrupt handler. This works a lot like a VIA.
+ */
+
+static void baboon_irq(unsigned int irq, struct irq_desc *desc)
+{
+	int irq_bit, irq_num;
+	unsigned char events;
+
+#ifdef DEBUG_IRQS
+	printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
+		(uint) baboon->mb_control, (uint) baboon->mb_ifr,
+		(uint) baboon->mb_status);
+#endif
+
+	events = baboon->mb_ifr & 0x07;
+	if (!events)
+		return;
+
+	irq_num = IRQ_BABOON_0;
+	irq_bit = 1;
+	do {
+	        if (events & irq_bit) {
+			baboon->mb_ifr &= ~irq_bit;
+			generic_handle_irq(irq_num);
+		}
+		irq_bit <<= 1;
+		irq_num++;
+	} while(events >= 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
+}
+
+/*
+ * Register the Baboon interrupt dispatcher on nubus slot $C.
+ */
+
+void __init baboon_register_interrupts(void)
+{
+	irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
+}
+
+/*
+ * The means for masking individual Baboon interrupts remains a mystery.
+ * However, since we only use the IDE IRQ, we can just enable/disable all
+ * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must
+ * either figure out how to mask them individually or else implement the
+ * same workaround that's used for NuBus slots (see nubus_disabled and
+ * via_nubus_irq_shutdown).
+ */
+
+void baboon_irq_enable(int irq)
+{
+#ifdef DEBUG_IRQUSE
+	printk("baboon_irq_enable(%d)\n", irq);
+#endif
+
+	mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
+}
+
+void baboon_irq_disable(int irq)
+{
+#ifdef DEBUG_IRQUSE
+	printk("baboon_irq_disable(%d)\n", irq);
+#endif
+
+	mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
+}