Linux-2.6.12-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, 187 insertions, 0 deletions

diff --git a/arch/ppc/syslib/cpc700_pic.c b/arch/ppc/syslib/cpc700_pic.c
new file mode 100644
index 000000000000..774709807538
--- /dev/null
+++ b/arch/ppc/syslib/cpc700_pic.c
@@ -0,0 +1,187 @@
+/*
+ * arch/ppc/syslib/cpc700_pic.c
+ *
+ * Interrupt controller support for IBM Spruce
+ *
+ * Authors: Mark Greer, Matt Porter, and Johnnie Peters
+ *	    mgreer@mvista.com
+ *          mporter@mvista.com
+ *          jpeters@mvista.com
+ *
+ * 2001-2002 (c) MontaVista, Software, Inc.  This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/irq.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+
+#include "cpc700.h"
+
+static void
+cpc700_unmask_irq(unsigned int irq)
+{
+	unsigned int tr_bits;
+
+	/*
+	 * IRQ 31 is largest IRQ supported.
+	 * IRQs 17-19 are reserved.
+	 */
+	if ((irq <= 31) && ((irq < 17) || (irq > 19))) {
+		tr_bits = CPC700_IN_32(CPC700_UIC_UICTR);
+
+		if ((tr_bits & (1 << (31 - irq))) == 0) {
+			/* level trigger interrupt, clear bit in status
+			 * register */
+			CPC700_OUT_32(CPC700_UIC_UICSR, 1 << (31 - irq));
+		}
+
+		/* Know IRQ fits in entry 0 of ppc_cached_irq_mask[] */
+		ppc_cached_irq_mask[0] |= CPC700_UIC_IRQ_BIT(irq);
+	
+		CPC700_OUT_32(CPC700_UIC_UICER, ppc_cached_irq_mask[0]);
+	}
+	return;
+}
+
+static void
+cpc700_mask_irq(unsigned int irq)
+{
+	/*
+	 * IRQ 31 is largest IRQ supported.
+	 * IRQs 17-19 are reserved.
+	 */
+	if ((irq <= 31) && ((irq < 17) || (irq > 19))) {
+		/* Know IRQ fits in entry 0 of ppc_cached_irq_mask[] */
+		ppc_cached_irq_mask[0] &=
+			~CPC700_UIC_IRQ_BIT(irq);
+
+		CPC700_OUT_32(CPC700_UIC_UICER, ppc_cached_irq_mask[0]);
+	}
+	return;
+}
+
+static void
+cpc700_mask_and_ack_irq(unsigned int irq)
+{
+	u_int	bit;
+
+	/*
+	 * IRQ 31 is largest IRQ supported.
+	 * IRQs 17-19 are reserved.
+	 */
+	if ((irq <= 31) && ((irq < 17) || (irq > 19))) {
+		/* Know IRQ fits in entry 0 of ppc_cached_irq_mask[] */
+		bit = CPC700_UIC_IRQ_BIT(irq);
+
+		ppc_cached_irq_mask[0] &= ~bit;
+		CPC700_OUT_32(CPC700_UIC_UICER, ppc_cached_irq_mask[0]);
+		CPC700_OUT_32(CPC700_UIC_UICSR, bit); /* Write 1 clears IRQ */
+	}
+	return;
+}
+
+static struct hw_interrupt_type cpc700_pic = {
+	"CPC700 PIC",
+	NULL,
+	NULL,
+	cpc700_unmask_irq,
+	cpc700_mask_irq,
+	cpc700_mask_and_ack_irq,
+	NULL,
+	NULL
+};
+
+__init static void
+cpc700_pic_init_irq(unsigned int irq)
+{
+	unsigned int tmp;
+
+	/* Set interrupt sense */
+	tmp = CPC700_IN_32(CPC700_UIC_UICTR);
+	if (cpc700_irq_assigns[irq][0] == 0) {
+		tmp &= ~CPC700_UIC_IRQ_BIT(irq);
+	} else {
+		tmp |= CPC700_UIC_IRQ_BIT(irq);
+	}
+	CPC700_OUT_32(CPC700_UIC_UICTR, tmp);
+
+	/* Set interrupt polarity */
+	tmp = CPC700_IN_32(CPC700_UIC_UICPR);
+	if (cpc700_irq_assigns[irq][1]) {
+		tmp |= CPC700_UIC_IRQ_BIT(irq);
+	} else {
+		tmp &= ~CPC700_UIC_IRQ_BIT(irq);
+	}
+	CPC700_OUT_32(CPC700_UIC_UICPR, tmp);
+
+	/* Set interrupt critical */
+	tmp = CPC700_IN_32(CPC700_UIC_UICCR);
+	tmp |= CPC700_UIC_IRQ_BIT(irq);
+	CPC700_OUT_32(CPC700_UIC_UICCR, tmp);
+		
+	return;
+}
+
+__init void
+cpc700_init_IRQ(void)
+{
+	int i;
+
+	ppc_cached_irq_mask[0] = 0;
+	CPC700_OUT_32(CPC700_UIC_UICER, 0x00000000);    /* Disable all irq's */
+	CPC700_OUT_32(CPC700_UIC_UICSR, 0xffffffff);    /* Clear cur intrs */
+	CPC700_OUT_32(CPC700_UIC_UICCR, 0xffffffff);    /* Gen INT not MCP */
+	CPC700_OUT_32(CPC700_UIC_UICPR, 0x00000000);    /* Active low */
+	CPC700_OUT_32(CPC700_UIC_UICTR, 0x00000000);    /* Level Sensitive */
+	CPC700_OUT_32(CPC700_UIC_UICVR, CPC700_UIC_UICVCR_0_HI);
+						        /* IRQ 0 is highest */
+
+	for (i = 0; i < 17; i++) {
+		irq_desc[i].handler = &cpc700_pic;
+		cpc700_pic_init_irq(i);
+	}
+
+	for (i = 20; i < 32; i++) {
+		irq_desc[i].handler = &cpc700_pic;
+		cpc700_pic_init_irq(i);
+	}
+
+	return;
+}
+
+
+
+/*
+ * Find the highest IRQ that generating an interrupt, if any.
+ */
+int
+cpc700_get_irq(struct pt_regs *regs)
+{
+	int irq = 0;
+	u_int irq_status, irq_test = 1;
+
+	irq_status = CPC700_IN_32(CPC700_UIC_UICMSR);
+
+	do
+	{
+		if (irq_status & irq_test)
+			break;
+		irq++;
+		irq_test <<= 1;
+	} while (irq < NR_IRQS);
+	
+
+	if (irq == NR_IRQS)
+	    irq = 33;
+
+	return (31 - irq);
+}