From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: 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!
---
 arch/ppc/syslib/ppc8xx_pic.c | 130 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 arch/ppc/syslib/ppc8xx_pic.c

(limited to 'arch/ppc/syslib/ppc8xx_pic.c')

diff --git a/arch/ppc/syslib/ppc8xx_pic.c b/arch/ppc/syslib/ppc8xx_pic.c
new file mode 100644
index 00000000000..d3b01c6c97d
--- /dev/null
+++ b/arch/ppc/syslib/ppc8xx_pic.c
@@ -0,0 +1,130 @@
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/8xx_immap.h>
+#include <asm/mpc8xx.h>
+#include "ppc8xx_pic.h"
+
+extern int cpm_get_irq(struct pt_regs *regs);
+
+/* The 8xx internal interrupt controller.  It is usually
+ * the only interrupt controller.  Some boards, like the MBX and
+ * Sandpoint have the 8259 as a secondary controller.  Depending
+ * upon the processor type, the internal controller can have as
+ * few as 16 interrups or as many as 64.  We could use  the
+ * "clear_bit()" and "set_bit()" functions like other platforms,
+ * but they are overkill for us.
+ */
+
+static void m8xx_mask_irq(unsigned int irq_nr)
+{
+	int	bit, word;
+
+	bit = irq_nr & 0x1f;
+	word = irq_nr >> 5;
+
+	ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
+	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+						ppc_cached_irq_mask[word];
+}
+
+static void m8xx_unmask_irq(unsigned int irq_nr)
+{
+	int	bit, word;
+
+	bit = irq_nr & 0x1f;
+	word = irq_nr >> 5;
+
+	ppc_cached_irq_mask[word] |= (1 << (31-bit));
+	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+						ppc_cached_irq_mask[word];
+}
+
+static void m8xx_end_irq(unsigned int irq_nr)
+{
+	if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
+			&& irq_desc[irq_nr].action) {
+		int bit, word;
+
+		bit = irq_nr & 0x1f;
+		word = irq_nr >> 5;
+
+		ppc_cached_irq_mask[word] |= (1 << (31-bit));
+		((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+			ppc_cached_irq_mask[word];
+	}
+}
+
+
+static void m8xx_mask_and_ack(unsigned int irq_nr)
+{
+	int	bit, word;
+
+	bit = irq_nr & 0x1f;
+	word = irq_nr >> 5;
+
+	ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
+	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+						ppc_cached_irq_mask[word];
+	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sipend = 1 << (31-bit);
+}
+
+struct hw_interrupt_type ppc8xx_pic = {
+	.typename = " 8xx SIU  ",
+	.enable = m8xx_unmask_irq,
+	.disable = m8xx_mask_irq,
+	.ack = m8xx_mask_and_ack,
+	.end = m8xx_end_irq,
+};
+
+/*
+ * We either return a valid interrupt or -1 if there is nothing pending
+ */
+int
+m8xx_get_irq(struct pt_regs *regs)
+{
+	int irq;
+
+	/* For MPC8xx, read the SIVEC register and shift the bits down
+	 * to get the irq number.
+	 */
+	irq = ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sivec >> 26;
+
+	/*
+	 * When we read the sivec without an interrupt to process, we will
+	 * get back SIU_LEVEL7.  In this case, return -1
+	 */
+        if (irq == CPM_INTERRUPT)
+        	irq = CPM_IRQ_OFFSET + cpm_get_irq(regs);
+#if defined(CONFIG_PCI)
+	else if (irq == ISA_BRIDGE_INT) {
+		int isa_irq;
+
+		if ((isa_irq = i8259_poll(regs)) >= 0)
+			irq = I8259_IRQ_OFFSET + isa_irq;
+	}
+#endif	/* CONFIG_PCI */
+	else if (irq == SIU_LEVEL7)
+		irq = -1;
+
+	return irq;
+}
+
+#if defined(CONFIG_MBX) && defined(CONFIG_PCI)
+/* Only the MBX uses the external 8259.  This allows us to catch standard
+ * drivers that may mess up the internal interrupt controllers, and also
+ * allow them to run without modification on the MBX.
+ */
+void mbx_i8259_action(int irq, void *dev_id, struct pt_regs *regs)
+{
+	/* This interrupt handler never actually gets called.  It is
+	 * installed only to unmask the 8259 cascade interrupt in the SIU
+	 * and to make the 8259 cascade interrupt visible in /proc/interrupts.
+	 */
+}
+#endif	/* CONFIG_PCI */
-- 
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