patch-2.3.39 linux/arch/ppc/kernel/ppc4xx_pic.c

• Lines: 206
• Date: Mon Jan 10 18:25:32 2000
• Orig file: v2.3.38/linux/arch/ppc/kernel/ppc4xx_pic.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.38/linux/arch/ppc/kernel/ppc4xx_pic.c linux/arch/ppc/kernel/ppc4xx_pic.c
@@ -0,0 +1,205 @@
+/*
+ *
+ *    Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
+ *
+ *    Module name: ppc4xx_pic.c
+ *
+ *    Description:
+ *      Interrupt controller driver for PowerPC 4xx-based processors.
+ */
+
+/*
+ * The PowerPC 403 cores' Asynchronous Interrupt Controller (AIC) has
+ * 32 possible interrupts, a majority of which are not implemented on
+ * all cores. There are six configurable, external interrupt pins and
+ * there are eight internal interrupts for the on-chip serial port
+ * (SPU), DMA controller, and JTAG controller.
+ *
+ * The PowerPC 405 cores' Universal Interrupt Controller (UIC) has 32
+ * possible interrupts as well. There are seven, configurable external
+ * interrupt pins and there are 17 internal interrupts for the on-chip
+ * serial port, DMA controller, on-chip Ethernet controller, PCI, etc.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/stddef.h>
+
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+
+#include "local_irq.h"
+#include "ppc4xx_pic.h"
+
+
+/* Global Variables */
+
+struct hw_interrupt_type *ppc4xx_pic;
+
+
+/* Function Prototypes */
+
+static void	 ppc403_aic_enable(unsigned int irq);
+static void	 ppc403_aic_disable(unsigned int irq);
+static void	 ppc403_aic_disable_and_ack(unsigned int irq);
+
+static void	 ppc405_uic_enable(unsigned int irq);
+static void	 ppc405_uic_disable(unsigned int irq);
+static void	 ppc405_uic_disable_and_ack(unsigned int irq);
+
+static struct hw_interrupt_type ppc403_aic = {
+	"403GC AIC",
+	NULL,
+	NULL,
+	ppc403_aic_enable,
+	ppc403_aic_disable,
+	ppc403_aic_disable_and_ack,
+	0
+};
+
+static struct hw_interrupt_type ppc405_uic = {
+	"405GP UIC",
+	NULL,
+	NULL,
+	ppc405_uic_enable,
+	ppc405_uic_disable,
+	ppc405_uic_disable_and_ack,
+	0
+};
+
+/*
+ * Document me.
+ */
+void __init
+ppc4xx_pic_init(void)
+{
+	unsigned long ver = PVR_VER(mfspr(SPRN_PVR));
+
+	switch (ver) {
+
+	case PVR_VER(PVR_403GC):
+		/*
+		 * Disable all external interrupts until they are
+		 * explicity requested.
+		 */
+		ppc_cached_irq_mask[0] = 0;
+		mtdcr(DCRN_EXIER, 0);
+
+		ppc4xx_pic = &ppc403_aic;
+		break;
+
+	case PVR_VER(PVR_405GP):
+		ppc4xx_pic = &ppc405_uic;
+		break;
+	}
+
+	return;
+}
+
+/*
+ * XXX - Currently 403-specific!
+ *
+ * Document me.
+ */
+int
+ppc4xx_pic_get_irq(struct pt_regs *regs)
+{
+	int irq;
+	unsigned long bits, mask = (1 << 31);
+
+	/*
+	 * Only report the status of those interrupts that are actually
+	 * enabled.
+	 */
+
+	bits = mfdcr(DCRN_EXISR) & mfdcr(DCRN_EXIER);
+
+	/*
+	 * Walk through the interrupts from highest priority to lowest, and
+	 * report the first pending interrupt found.
+	 */
+
+	for (irq = 0; irq < NR_IRQS; irq++, mask >>= 1) {
+		if (bits & mask)
+			break;
+	}
+
+	return (irq);
+}
+
+/*
+ * Document me.
+ */
+static void
+ppc403_aic_enable(unsigned int irq)
+{
+	int bit, word;
+
+	bit = irq & 0x1f;
+	word = irq >> 5;
+
+	ppc_cached_irq_mask[word] |= (1 << (31 - bit));
+	mtdcr(DCRN_EXIER, ppc_cached_irq_mask[word]);
+}
+
+/*
+ * Document me.
+ */
+static void
+ppc403_aic_disable(unsigned int irq)
+{
+	int bit, word;
+
+	bit = irq & 0x1f;
+	word = irq >> 5;
+
+	ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
+	mtdcr(DCRN_EXIER, ppc_cached_irq_mask[word]);
+}
+
+/*
+ * Document me.
+ */
+static void
+ppc403_aic_disable_and_ack(unsigned int irq)
+{
+	int bit, word;
+
+	bit = irq & 0x1f;
+	word = irq >> 5;
+
+	ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
+	mtdcr(DCRN_EXIER, ppc_cached_irq_mask[word]);
+	mtdcr(DCRN_EXISR, (1 << (31 - bit)));
+}
+
+/*
+ * Document me.
+ */
+static void
+ppc405_uic_enable(unsigned int irq)
+{
+	/* XXX - Implement me. */
+}
+
+/*
+ * Document me.
+ */
+static void
+ppc405_uic_disable(unsigned int irq)
+{
+	/* XXX - Implement me. */
+}
+
+/*
+ * Document me.
+ */
+static void
+ppc405_uic_disable_and_ack(unsigned int irq)
+{
+	/* XXX - Implement me. */
+}